阅读说明：本技术 用于玻璃瓶制造用初模的脱模润滑剂涂布装置、用于玻璃瓶制造用初模的脱模润滑剂涂布方法、玻璃瓶制造装置以及玻璃瓶制造方法 (Release lubricant application device for glass bottle manufacturing blank mold, release lubricant application method for glass bottle manufacturing blank mold, glass bottle manufacturing device, and g) 是由 河原隆介 石黑翔太 大西邦和 中嶋浩志 前田泰志 于 2018-06-05 设计创作，主要内容包括：提供能够减小脱模润滑剂涂布后的玻璃瓶根部的壁厚变化的用于玻璃瓶制造用初模的脱模润滑剂涂布装置、用于玻璃瓶制造用初模的脱模润滑剂涂布方法、玻璃瓶制造装置以及玻璃瓶制造方法。关于设定于初模(10)的内表面中口模(11)侧的第一区域(41)和设定于与该第一区域(41)相比离口模(11)远的部位的第二区域(42),用于玻璃瓶制造用初模的脱模润滑剂涂布装置(5)以使得第一区域(41)的脱模润滑剂膜厚(T1)比第二区域42的脱模润滑剂膜厚(T2)(包括零)厚的方式涂布脱模润滑剂。(Provided are a mold release lubricant application device for a preform for producing a glass bottle, a mold release lubricant application method for a preform for producing a glass bottle, a glass bottle production device, and a glass bottle production method, which are capable of reducing a change in the wall thickness of the base of a glass bottle after application of a mold release lubricant. A release lubricant coating device (5) for a preform for manufacturing a glass bottle coats a release lubricant so that the thickness (T1) of the release lubricant film in a first region (41) set on the side of a die (11) in the inner surface of the preform (10) and a second region (42) set at a position farther from the die (11) than the first region (41) are thicker (including zero) than the thickness (T2) of the release lubricant film in the second region (42).)

1. A demoulding lubricant coating device for a primary mould for manufacturing glass bottles is characterized in that,

the structure is as follows: a first region set on the die side of an inner surface of a blank mold and a second region set at a position farther from the die than the first region are coated with a release lubricant so that the thickness of the release lubricant film in the first region is larger than that in the second region, and the thickness of the release lubricant film in the second region is zero.

2. The apparatus for applying a release lubricant to a blank mold for manufacturing a glass bottle as set forth in claim 1,

the second region comprising a bottle bottom side formation in the blank mold,

the release lubricant applying device is configured to: the release lubricant is not applied to the bottle bottom-side forming portion.

3. The release lubricant application apparatus for a blank mold for manufacturing a glass bottle according to claim 1 or 2,

the boundary between the first region and the second region is set at a position which is 30% to 80% of the entire length of the inner surface of the blank mold from the end of the inner surface of the blank mold on the side of the die.

4. The device for applying a release lubricant to a blank mold for producing a glass bottle as claimed in any one of claims 1 to 3,

the coating device is configured to: applying the release lubricant to a blow molding preform as the preform,

the first region includes a region extending from a position corresponding to a main blow line to the die side in the primary blow molding die.

5. The device for applying a release lubricant to a blank mold for producing a glass bottle as claimed in any one of claims 1 to 3,

the coating device is configured to: applying the release lubricant to a blank mold for press molding as the blank mold,

the first region is a region of the press-molding blank mold where the gob collides while rubbing when the gob is filled in the press-molding blank mold.

6. The device for applying a release lubricant to a blank mold for manufacturing a glass bottle as set forth in any one of claims 1 to 5, further comprising:

a coating section that coats the release lubricant on the blank mold; and

and a control unit for controlling the operation of the coating part.

7. The apparatus for applying a release lubricant to a blank mold for manufacturing a glass bottle as set forth in claim 6,

the coating section is configured to: by displacing the displacement mechanism relative to the primary mould,

the control unit includes a control section that controls the operation of the displacement mechanism and the supply of the release lubricant from the application section.

8. The device for applying a release lubricant to a blank mold for producing a glass bottle as claimed in claim 6 or 7,

the coating section is controlled by the control unit such that the coating section starts spraying of the release lubricant at a position on either one of a boundary side between the first region and the second region and an end of the blank inner surface on the die side, and sprays the release lubricant while shifting to the other side.

9. The apparatus for applying a release lubricant to a blank mold for manufacturing a glass bottle as set forth in claim 8,

the coating section is configured to: after the spraying of the mold release lubricant is performed from the boundary between the first region and the second region to the end of the inner surface of the blank mold on the side of the die, the spraying of the mold release lubricant is stopped without performing the spraying of the mold release lubricant to the die.

10. The apparatus for applying a release lubricant to a blank mold for manufacturing a glass bottle as set forth in claim 8,

the coating section is configured to: after the release lubricant is sprayed from the boundary between the first region and the second region to the die-side end of the inner surface of the primary die, the spray of the release lubricant is maintained, and the spray is sprayed onto the upper surface of the die with the opening of the pair of half dies of the primary die, and further sprayed onto the inner surface of the die into the space in the die.

11. The apparatus for applying a release lubricant to a blank mold for manufacturing a glass bottle as set forth in claim 8,

the coating section is configured to: after the spraying of the die release lubricant is performed from the boundary between the first region and the second region to the end of the inner surface of the primary die on the die side, the spraying of the die release lubricant is temporarily stopped, and then the spray is first applied to the inner surface of the die and then applied to the upper surface of the die as the pair of half dies of the primary die are opened and enter the space in the die.

12. A method for applying a release lubricant to a preform for the manufacture of glass bottles,

a first region set on the die side of an inner surface of a blank mold and a second region set at a position farther from the die than the first region are coated with a release lubricant so that the thickness of the release lubricant film in the first region is larger than that in the second region, and the thickness of the release lubricant film in the second region is zero.

13. A glass bottle manufacturing device is characterized in that,

a mold release lubricant application device for a blank mold for producing a glass bottle as defined in any one of claims 1 to 11.

14. A method of making a glass bottle, comprising:

a release lubricant applying step of applying a release lubricant so that a thickness of a release lubricant film in a first region set on a die side in an inner surface of a blank mold is larger than a thickness of a release lubricant film in a second region set at a position farther from the die than the first region, the thickness of the release lubricant film in the second region including zero; and

and a molding step of molding a preform using the preform mold.

Technical Field

The present invention relates to a release lubricant application device for a preform for producing a glass bottle, a release lubricant application method for a preform for producing a glass bottle, a glass bottle production device, and a glass bottle production method.

Background

In general, a glass bottle is finally molded by filling a gob (a glass gob in a molten state at a high temperature) into a mold and expanding the gob with compressed air or further expanding a preform molded by pressing with compressed air. Usually, a mold release lubricant is applied to the mold (see, for example, patent document 1). The mold release lubricant is applied to the inner surface of the mold for the purpose of facilitating the mold release of the preform from the mold (ensuring releasability) and for the purpose of ensuring the sliding properties between the mold and the gob. However, in order to prevent the decrease in the mold release property and the sliding property, the mold release lubricant needs to be applied to the inner surface of the mold at regular intervals of, for example, several tens of minutes.

The hollow glass article forming mold described in patent document 1 has two mold portions. Further, the following configurations are disclosed: in a state where the two mold sections are in the mold closing position where they are closed to each other, a uniform oil coating is formed on the entire inner surface of the cavity defining the mold through the movable blow pipe.

Disclosure of Invention

Technical problem to be solved by the invention

However, when the release lubricant is applied to the entire inner surface defining the cavity, the wall thickness of the base portion of the glass bottle, for example, is likely to change due to a decrease in the close contact between the mold and the parison.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a release lubricant application device for a preform for producing a glass bottle, a release lubricant application method for a preform for producing a glass bottle, a glass bottle production device, and a glass bottle production method, which can secure a glass bottle having a smaller change in wall thickness.

Means for solving the problems

The inventors of the present application have made extensive studies to find: the present invention has been completed based on the idea that the application of a mold release lubricant to the entire inner surface of a preform for producing a glass bottle is not necessarily optimal for the molding of the glass bottle.

(1) In order to solve the above-described problems, a mold release lubricant application device for a blank mold for manufacturing a glass bottle according to an aspect of the present invention is configured to: the first region set on the die side in the inner surface of the blank mold and the second region set at a position farther from the die than the first region are coated with the release lubricant so that the thickness of the release lubricant film in the first region is greater than the thickness (including zero) of the release lubricant film in the second region.

According to this configuration, the first region set on the die side is a region of the inner surface of the blank mold which collides with the gob during gob filling, for example, while rubbing, and therefore, the mold release lubricant needs to be applied. On the other hand, the second region is set at a position farther from the die than the first region, and therefore does not come into contact with the gob at the time of gob filling. Therefore, in the second region, there is no necessity to apply the release lubricant in order to ensure slidability with the gob. By setting the film thickness of the mold release lubricant in the second region to be thinner than the film thickness of the mold release lubricant in the first region as in this configuration, the variation in the wall thickness at the bottle root can be reduced.

(2) The second region may include a bottle bottom side forming portion in the blank mold, and the mold release lubricant applying device may be configured to: the release lubricant is not applied to the bottle bottom-side forming portion.

The bottle bottom side forming part is a side part of the stopper in the inner surface of the primary mold.

According to this configuration, the thickness variation of the bottle root can be reduced by suppressing the decline of the close contact between the blank and the primary mold at the bottle bottom-side forming portion.

(3) Preferably, a boundary between the first region and the second region is set at a position which is 30% to 80% of a total length of the inner surface of the blank mold from one end of the inner surface of the blank mold on the side of the die.

According to this configuration, by setting the position of the boundary to be equal to or higher than the lower limit value, the release lubricant can be more reliably applied to the portion of the blank mold where the release lubricant needs to be sufficiently applied from the viewpoint of improving the sliding property. Further, by setting the position of the boundary to be equal to or less than the above upper limit value, the wall thickness variation of the bottle root portion can be more reliably reduced.

(4) Preferably, the coating device is configured to: and applying the release lubricant to a blow molding blank mold as the blank mold, wherein the first region includes a region extending from a position corresponding to a main blow line to the die side in the blow molding blank mold.

According to this configuration, the release lubricant can be reliably supplied to the portion of the inner surface of the blank mold where the gob rubs when the compressed air pressurizes the gob toward the die side in the forward blowing step. On the other hand, the film thickness of the release lubricant at the portion of the inner surface of the blank mold where the possibility of the feed drop rubbing in the positive-blowing step is low may be zero or a value smaller than the film thickness of the first region. This can reduce the wall thickness variation at the bottle root.

(5) Preferably, the coating device is configured to: the release lubricant is applied to a blank mold for press molding, which is the blank mold, and a region of the blank mold for press molding, in which the gob collides while rubbing when the gob is filled in the blank mold for press molding, is set as the first region.

According to this configuration, it is possible to supply a sufficient release lubricant to the first region where the slidability is required due to the droplet friction.

(6) Preferably, the coating apparatus further includes: a coating section that coats the release lubricant on the blank mold; and a control unit for controlling the operation of the coating part.

With this configuration, the control means can control the actual thickness of the release lubricant film by controlling the application section.

(7) Preferably, the coating section is configured to: the control unit includes a control section that controls the operation of the displacement mechanism and the supply of the release lubricant from the application section by displacing the displacement mechanism relative to the blank mold.

According to this configuration, the control means can supply the release lubricant toward the blank mold by operating the displacement mechanism while changing the position of the application section. This makes it possible to control the actual thickness of the release lubricant film in each portion of the inner surface of the blank mold.

(8) Preferably, the coating section is controlled by the control unit such that the coating section starts spraying of the release lubricant at a position on one side of a boundary between the first region and the second region and one end of the inner surface of the blank mold on the side of the die, and sprays the release lubricant while shifting to the other side.

According to this configuration, for example, when the die release lubricant is sprayed while the coating portion is shifted from the boundary side between the first region and the second region toward the die, adhesion of unnecessary die release lubricant to the second region can be more reliably prevented. In addition, when the die release lubricant is sprayed while the coating portion is shifted from the die side toward the boundary between the first region and the second region, a more significant difference in film thickness can be easily achieved at the boundary between the first region and the second region.

(9) The coating section may be configured to: after the spraying of the mold release lubricant is performed from the boundary between the first region and the second region to the end of the inner surface of the blank mold on the side of the die, the spraying of the mold release lubricant is stopped without performing the spraying of the mold release lubricant to the die.

According to this configuration, the die can be prevented from being coated with the release lubricant.

(10) The coating section may be configured to: after the release lubricant is sprayed from the boundary between the first region and the second region to the die-side end of the inner surface of the primary die, the spray of the release lubricant is maintained, and the spray is sprayed onto the upper surface of the die with the opening of the pair of half dies of the primary die, and further sprayed onto the inner surface of the die into the space in the die.

According to this configuration, the release lubricant can be applied to the blank mold and the die mold while maintaining a stable spray state of the release lubricant from the application section.

(11) The coating section may be configured to: after the spraying of the die release lubricant is performed from the boundary between the first region and the second region to the end of the inner surface of the primary die on the die side, the spraying of the die release lubricant is temporarily stopped, and then the spray is first applied to the inner surface of the die and then applied to the upper surface of the die as the pair of half dies of the primary die are opened and enter the space in the die.

With this configuration, the coating section can apply the release lubricant to a wide range of the upper surface of the die. As a result, the slidability (ease of sliding) between the blank mold and the die can be further improved.

(12) In order to solve the above-described problems, one aspect of the present invention relates to a method for applying a release lubricant to a blank mold for producing a glass bottle, the method including applying a release lubricant to a first region set on the side of a die in an inner surface of the blank mold and a second region set at a position farther from the die than the first region such that a film thickness of the release lubricant in the first region is thicker (including zero) than a film thickness of the release lubricant in the second region.

(13) In order to solve the above-described problems, a glass bottle manufacturing apparatus according to an aspect of the present invention includes the above-described mold release lubricant application device for a blank mold for manufacturing a glass bottle.

(14) In order to solve the above-described problems, a method for manufacturing a glass bottle according to an aspect of the present invention includes: a release lubricant applying step of applying a release lubricant so that a thickness of a release lubricant film in a first region set on a die side in an inner surface of a blank mold is larger than a thickness of a release lubricant film in a second region set at a position farther from the die than the first region, the thickness of the release lubricant film in the second region including zero; and a molding step of molding a preform using the preform mold.

According to the above configurations (12) to (14), the first region set on the die side is a region of the inner surface of the blank mold which collides with the gob during gob filling, for example, while rubbing, and therefore, it is necessary to apply the release lubricant because it is necessary to have slidability. On the other hand, the second region is set at a position farther from the die than the first region, and therefore does not come into contact with the gob at the time of gob filling. Therefore, in the second region, there is no necessity to apply the release lubricant in order to ensure slidability with the gob. In this configuration, the thickness of the mold release lubricant in the second region is set to be thinner than the thickness of the mold release lubricant in the first region, and thus the thickness variation in the root portion of the bottle can be reduced.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the wall thickness variation of the bottle root portion caused by the application of the mold release lubricant can be reduced. As a result, the thickness of the glass bottle can be prevented from exceeding the specification, and the number of waste products due to the release lubricant application can be reduced, which contributes to an improvement in production efficiency. In addition, by dividing the application region, the amount of the release lubricant used can be suppressed.

Drawings

FIG. 1 is a schematic view of a glass bottle manufacturing apparatus according to a first embodiment of the present invention;

FIG. 2 is a schematic view showing a coating apparatus and a blank mold;

fig. 3 (a), (B), and (C) are diagrams for explaining the outline of the blank mold process, in which (a) shows a state in which a gob has been filled in the blank mold, (B) shows a forward blowing process, and (C) shows a reverse blowing process;

fig. 4 is a diagram for explaining (1) nozzle operation in a case where the coating device applies the release lubricant to the inner surface of the blank mold but does not apply the release lubricant to the inner surface of the die;

fig. 5 (a) and (B) are views for explaining mode a in the case (2) where the coating device coats the release lubricant on the inner surface of the blank mold and the inner surface and the upper surface of the finish mold;

fig. 6 (a) and (B) are views for explaining mode B in the case (2) where the coating device coats the release lubricant on the inner surface of the blank mold and the inner surface and the upper surface of the finish mold;

fig. 7 (a) to (C) are views for explaining pattern C in the case (2) where the coating device coats the release lubricant on the inner surface of the blank mold and the inner surface and the upper surface of the finish mold;

fig. 8 (a) to (C) are views for explaining pattern D in the case (2) where the coating device coats the release lubricant on the inner surface of the blank mold and the inner surface and the upper surface of the finish mold;

fig. 9 (a) and (B) are views for explaining a mode E in the case (2) where the coating device coats the release lubricant on the inner surface of the blank mold and the inner surface and the upper surface of the finish mold;

FIG. 10 is a schematic view of a glass bottle manufacturing apparatus according to a second embodiment of the present invention;

FIG. 11 is a schematic view showing a coating apparatus and a blank mold;

fig. 12 is a diagram for explaining the outline of the primary mold process, in which (a) shows a state in which a gob has been filled in the primary mold, and (B) shows a pressing process of the primary mold;

FIG. 13 is a side view of glass bottles of examples and comparative examples;

fig. 14 shows the average value of the glass wall thickness at each height position x (mm) from the ground contact surface of the reference glass bottle of the example and the reference glass bottle of the comparative example, respectively;

fig. 15 (a) is a graph in which the average value of the glass wall thickness at each position of the height position x (mm) from the ground contact surface of the bottle is plotted by the difference in wall thickness between the reference glass bottle of each of the comparative examples (full-surface coating) of the first to fifth rounds after the coating of the mold release lubricant and the comparative example; fig. 15 (B) is a graph in which the wall thickness difference between each of the examples (coating first region) of the first to fifth wheels after the coating of the release lubricant and the reference glass bottle of the example is plotted with respect to the average value of the glass wall thickness at each position of the height position of x (mm) from the ground contact surface of the bottle.

Detailed Description

The mode for carrying out the present invention will be described below with reference to the drawings.

< first embodiment >

Fig. 1 is a schematic view of a glass bottle manufacturing apparatus 1 according to a first embodiment of the present invention. Fig. 2 is a schematic view showing the coating device 5 and the blank mold 10 of the glass bottle manufacturing apparatus 1. Referring to fig. 1 to 2, a glass bottle manufacturing apparatus 1 (hereinafter, also referred to as a manufacturing apparatus 1) manufactures a preform 102 as an intermediate for manufacturing a glass bottle 103 by a blow-and-blow method.

The manufacturing apparatus 1 includes a preliminary mold part 2 and a coating apparatus 5.

The blank mold part 2 is used for molding a blank 102. Gob 101 (molten glass gob) is supplied (filled) to blank mold part 2, and blank mold part 2 molds gob 101 into blank 102.

The primary mold part 2 has a primary mold 10, a die 11, a funnel 12, a block 13, a sleeve 21, and a punch 22.

A coating layer is formed by carbon coating or the like on the inner surface of the blank mold 10 in the region where the gob 101 is molded into the blank 102. And, a mold release lubricant is also periodically applied to the inner surface thereof.

The blank mold 10 is used for molding the glass bottle 103 except for the bottle mouth portion 101 a. The inner surface of the blank mold 10 forms a chamber 17 for filling the gob 101. In the present specification, the face of the surface of the blank mold 10 in which the cavity 17 is formed is referred to as an inner surface of the blank mold 10. The blank mold 10 includes a pair of mold halves 10a and 10b facing each other in a direction orthogonal to the longitudinal direction L1. These mold halves 10a, 10b combine with each other, so that a cavity 17 is formed. In the present embodiment, the cavity 17 is formed in a tapered shape that widens as it goes away from the die 11. The chamber 17 may be cylindrical. The upper end (the side of the closure 13) of the blank mold 10 includes a bottle bottom side forming portion 10 c. The lower end 10d of the blank mold 10 is formed in an upwardly recessed shape, and a die 11 is disposed in the recessed portion.

The mouthpiece 11 is used to form a mouth portion 101a of the glass bottle 103. The neck mold 11 is fitted to the lower end 10d of the primary mold 10. The upper surface 11c of the mouthpiece 11 faces the lower surface of the lower end 10d of the blank mold 10. Further, the die 11 is closed by the sleeve 21 and the punch 22. The die 11 has a pair of die halves 11a, 11b facing each other in a direction orthogonal to the longitudinal direction L1, and these die halves 11a, 11b are combined with each other. A spiral groove or a concave-convex portion is formed on the inner surface of the die 11.

The mold halves 10a and 10b are appropriately switched between an open state in which they are separated from each other and a closed state in which they are closed with each other by an opening/closing mechanism, not shown. Similarly, the mold halves 11a and 11b are appropriately switched between an open state in which they are separated from each other and a closed state in which they are closed with each other by an opening and closing mechanism, not shown.

The hopper 12 is cylindrical and assists the entry of the gob 101 into the chamber 17. In addition, the funnel 12 closes the upper end of the blank mold 10 in cooperation with the stopper 13 in the positive air blowing process. After this closing action, the compressed air is ejected towards the gob 101 inside the chamber 17 through the vent hole of the closure 13.

The punch 22 is configured to: compressed air supplied from a compressor, not shown, can be blown toward the gob 101 in the chamber 17. The punch 22 is guided by the cylindrical sleeve 21 and is movable up and down (in the longitudinal direction L1 of the blank mold 10).

The outline of the primary molding step (primary blank molding) performed using the manufacturing apparatus 1 having the above-described configuration will be described below. In the blank mold step (blank molding), first, as shown in fig. 3a, a gob 101 is filled into the cavity 17 of the blank mold 10 with the funnel 12 attached. At this time, the punch 22 is raised, and the tip portion of the punch 22 receives the gob 101. Thereafter, as shown in fig. 3 (B), the plug 13 is mounted on the funnel 12.

Next, compressed air is ejected from the closing member 13 toward the chamber 17 as indicated by an arrow. Thereby, the gob 101 is deformed so as to be pressed against the die 11. As a result, the bottle mouth portion 101a is formed in the gob 101, and the entire gob 101 is pressed against the inner surface of the blank mold 10. At this time, the boundary line between the gob 101 in a compressed (pressurized) state in the chamber 17 and the air is at a position 18 corresponding to the main blowing line.

Next, as shown in fig. 3 (C), in a state where the upper end of the blank mold 10 is closed by the closing member 13, the punch 22 is lowered, and compressed air is blown from the lower portion of the punch 22 through the inside of the punch 22 toward the inside of the gob 101 as shown by the arrow. Namely, the reverse blowing step is performed. Thereby, the gob 101 is pressed against the entire inner surface of the blank mold 10, and a cavity is formed inside the gob 101. By this step, the blank 102 is molded. The preform 102 is subjected to a finishing process, not shown, to be a glass bottle 103.

As described above, in the above step, the release lubricant is periodically applied to the inner surface of the cavity of the blank mold 10 in order to ensure the slidability with the gob 101 and the releasability (easiness of separation) from the blank 102. In order to apply the release lubricant, an application device 5 is used.

Referring to fig. 1 to 2, an example of the release lubricant applied by the application device 5 is mineral oil containing graphite particles as a solid lubricant. In the present embodiment, the coating device 5 is configured to coat the release lubricant on the inner surface (the inner surface forming the cavity 17) of the blow molding blank mold, that is, the blank mold 11.

The coating device 5 includes a control unit (control unit) 31, a shift mechanism 32, a release lubricant supply mechanism (not shown), and a nozzle 34.

The control unit 31 has a configuration for outputting a predetermined output signal based on a predetermined input signal, and may be formed by a Programmable Logic Controller (PLC), for example. The control Unit 31 may be formed of a computer or the like including a CPU (central processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory). The control unit 31 may shift the nozzle 34 by spraying the release lubricant from the nozzle 34 by a mechanical device without including an electric circuit.

The control unit 31 is configured to control the operation of the displacement mechanism 32 (nozzle 34) and the supply amount (spray amount) of the release lubricant from a spray outlet 38 of the nozzle 34, which will be described later. The amount of spray to each region of the inner surface of the blank mold 10 can be controlled by controlling the amount of spray from the nozzle 34 (hydraulic pressure), controlling the speed of the nozzle 34 moving up and down with the amount of spray fixed, and controlling the timing of spraying the release lubricant from the nozzle 34. Of course, desired application can be achieved by controlling the start-end (ON-OFF) of spraying of the release lubricant from the nozzle 34.

The controller 31 is configured to be able to detect the open/close state of the pair of halves 10a and 10b of the blank mold 10. For example, a sensor for detecting the open/close position of the pair of mold halves 10a, 10b may be connected to the control unit 31, and the control unit 31 may detect the open/close state of the pair of mold halves 10a, 10 b. For example, a control circuit that controls the operation of the pair of mold halves 10a and 10b may be connected to the control unit 31, and the control unit 31 may detect the open/closed state of the pair of mold halves 10a and 10b by receiving a signal from the control circuit. For example, the controller 31 may control the opening and closing operations of the pair of mold halves 10a and 10 b.

The displacement mechanism 32 is used to displace the nozzle 34 relative to the blank mold 10 and to maintain the position of the nozzle 34. The shift mechanism 32 is formed using a multi-robot such as a six-axis robot. The displacement mechanism 32 is not limited to a specific one as long as at least the nozzle 34 can be moved into and out of the cavity 17 of the blank mold 10. Preferably, the displacement mechanism 32 is configured to: when a plurality of blank molds 10 are provided, the nozzle 3 can be inserted into and removed from the chamber 17 of any of the blank molds 10. The shift mechanism 32 can shift the nozzle 34 with respect to the mouthpiece 11, and when a plurality of mouthpieces 11 are provided, the spray can be applied to both the inner surface and the upper surface 11c of any mouthpiece 11. Thus, even if the die 11 is elongated, the release lubricant can be reliably applied to the entire inner surface of the die 11.

The release lubricant supply mechanism is used to supply the release lubricant to the nozzle 34, and includes, for example, a hose, a pump, and a control valve for supplying the release lubricant to the nozzle 34. The release lubricant supply mechanism is electrically connected to the control unit 31, and is configured to control supply and stop supply of the release lubricant to the nozzle 34 under the control of the control unit 31.

The nozzle 34 is used to spray the release lubricant. The nozzle 34 is formed in an elongated rod shape, and a base end of the nozzle 34 is supported by a distal end of the displacement mechanism 32. A spray outlet (application portion) 38 formed of a slit or the like is provided at the tip of the nozzle 34. The plurality of spray outlets 38 are arranged on the outer peripheral surface of the nozzle 34, for example, around the center axis of the nozzle 34. The release lubricant reaches the spray port 38 through a path (not shown) inside the nozzle 34, and is sprayed from the spray port 38 to the corresponding cavity 17 (the inner surface of the blank mold 10, the inner surface of the die 11, and the upper surface 11 c). In this way, the spray opening 38 functions as an application section for applying the release lubricant to the blank mold 10.

The spraying method of spraying the mold release lubricant from the spray port 38 may be a method using a pump (for example, a plunger pump) or a method using two-fluid mixing (mixing of the mold release lubricant and air) using compressed air. The spray opening 38 sprays the mold release lubricant so as to form a hollow-cone (hollow-cone) spray pattern 39, for example. The hollow conical spray pattern 39 is formed so as to face downward from a position surrounded by the corresponding blank mold 10, for example. The angle θ (angle with respect to the vertical line) of the region where the hollow cone-shaped spray pattern 39 is formed is appropriately set by setting the shape of the spray outlet 38.

An annular plate disposed coaxially with the nozzle 34 may be attached to the outer peripheral surface of the nozzle 34 in the vicinity of the spray outlet 38. When the annular plate is provided, the annular plate can prevent the release lubricant from scattering excessively to an undesired portion.

In the present embodiment, the coating device 5 is configured to: the first region 41 set on the die 11 side in the inner surface of the blank mold 10 and the second region 42 set at a position farther from the die 11 than the first region 41 are coated with the mold release lubricant such that the film thickness T1 of the mold release lubricant in the first region 41 is larger than the film thickness T2 (including zero) of the mold release lubricant in the second region 42.

Specifically, when the glass bottle 103 is intermittently manufactured and the cavity 17 is not filled with the gob 101, the nozzle 34 is inserted into the cavity 17 by the operation of the displacement mechanism 32. Next, the spray opening 38 of the nozzle 34 sprays the release lubricant at least to the first region 41, so that the film thickness T1 of the release lubricant in the first region 41 is larger than the film thickness T2 (including zero) of the release lubricant in the second region 42. For example, the relationship between the film thicknesses T1 and T2 can be achieved by making the flow rate from the spray nozzle 38 the same and making the spraying time of the release lubricant to the first region 41 longer than the spraying time of the release lubricant to the second region 42.

The amount of spray (hydraulic pressure) per unit time of the die release lubricant from the nozzle 34 may be relatively small in the first region 41 on the second region 42 side, and relatively large in the first region 41 on the die 11 side.

The nozzle 34 may spray the release lubricant in a stationary state in the chamber 17, or may spray the release lubricant while moving in the longitudinal direction L1 by the displacement mechanism 32. Preferably, the central axis of the nozzle 34 is arranged in a manner coinciding with the central axis of the chamber 17.

The first region 41 is set in the entire region of the inner surface of the blank mold 10 extending from the position 18 corresponding to the main blowing line in the blank mold 10 to the mouthpiece 11 side. For example, the first region 41 is set to extend over the entire region from the position 18 corresponding to the main blowing line to the one end 10e on the die 11 side in the inner surface of the blank mold 10.

It is preferable that the boundary 19 (in the present embodiment, the portion corresponding to the position 18 corresponding to the normal blow line) between the first region 41 and the second region 42 is set at a position 30% to 80% of the total length a1 from the end 10e of the inner surface of the blank mold 10 on the side of the die 11, the total length a1 being the total length of the inner surface of the blank mold 10 in the longitudinal direction L1. That is, the boundary 19 between the first region 41 and the second region 42 may be located 30% of the entire length a1 from the one end 10e of the inner surface of the blank mold 10, 80% of the entire length a1 from the one end 10e of the inner surface of the blank mold 10, or between these two positions.

By setting the boundary 19 between the first region 41 and the second region 42 at a position spaced apart from the one end 10e of the inner surface of the blank mold 10 on the die 11 side by 30% or more of the entire length a1, it is possible to ensure that the gob 101 is received more reliably in the first region 41, i.e., the region sufficiently coated with the release lubricant, when the gob 101 is filled in the cavity 17. This can sufficiently ensure the slidability of the gob 101 with respect to the blank mold 10. Further, by setting the boundary 19 between the first region 41 and the second region 42 at a position spaced apart from the one end 10e of the inner surface of the blank mold 10 on the side of the finish mold 11 by 80% or less of the entire length a1, it is possible to more reliably prevent the release lubricant from being applied to the bottle bottom side forming portion 10c, which is the upper end of the blank mold 10. More preferably, the boundary 19 between the first region 41 and the second region 42 is set at a position 40% to 70% of the entire length a1 from the one end 10e of the inner surface of the blank mold 10 on the side of the die 11.

The second region 42 is a region of the inner surface of the blank mold 10 other than the first region 41. The second region 42 includes the bottle bottom side forming portion 10c of the blank mold 10. In the present embodiment, the second regions 42 are formed over the entire circumferential region of the inner surface of the blank mold 10.

The film thickness T1 of the die release lubricant at the first region 41 is set to such an extent that the die release lubricant does not sag in the first region 41. The film thickness T2 of the release lubricant in the second region 42 may be smaller than the film thickness T1 of the release lubricant. In the present embodiment, the film thickness T2 of the release lubricant is set to zero. That is, the release lubricant is not applied to the second region 42 including the bottle bottom-side forming portion 10 c.

The spray opening 38 of the nozzle 34 is controlled by the control unit 31 such that: spraying of the release lubricant is started at a position on either one of the boundary 19 side (upper side) between the first region 41 and the second region 42 and the one end 10e (lower side) of the inner surface of the blank mold 10 on the side of the mouthpiece 11, and the release lubricant is sprayed while being displaced toward the other side.

Next, the step of applying the release lubricant by the application device 5 will be described more specifically. In the following, two cases are described: (1) the case where the coating device 5 applies the release lubricant to the inner surface of the blank mold 10 without applying the release lubricant to the inner surface of the die 11; and (2) the coating device 5 coats the inner surface of the blank mold 10, the inner surface of the die 11, and the upper surface 11c with the release lubricant. In the case of (2) above, five modes (mode A, B, C, D, E) will be described.

(1) The case where the coating device 5 applies the release lubricant to the inner surface of the blank mold 10 without applying the release lubricant to the inner surface of the die 11 will be described with reference to fig. 4. In this case, the die 11 may be present or absent.

In the case of (1) above, the pair of half molds 10a, 10b of the blank mold 10 may be initially closed or opened, but is preferably closed. It is preferable that the spraying of the release lubricant by the nozzle 34 is started after the spray opening 38 is inserted into the cavity 17. Then, spraying of the release lubricant from the spray opening 38 is started at the position and the moving speed of the nozzle 34 and the hydraulic pressure of the release lubricant set by the control unit 31, and the release lubricant is applied to a predetermined portion. The spray opening 38 of the nozzle 34 sprays the release lubricant from the boundary 19 on the inner surface of the blank mold 10 to the one end 10e on the die 11 side, and then stops spraying the release lubricant without spraying the release lubricant to the die 11. At this time, the nozzle 34 may spray the release lubricant while descending from the boundary 19 side toward the mouthpiece 11, or may spray the release lubricant while ascending from the one end 10e of the inner surface of the blank mold 10 toward the boundary 19 side.

In the case of the above mode (1), the die 11 can be free from the application of the release lubricant.

(2) The coating device 5 is configured to apply a release lubricant to the inner surface of the blank mold 10 and the inner surface and the upper surface of the die 11.

Next, mode (2) a will be described with reference to fig. 5 (a) and 5 (B).

Referring to fig. 5 (a), in this mode a, the pair of half molds 10a, 10b of the blank mold 10 can be initially closed and opened, but is preferably closed. It is preferable that the spraying of the release lubricant by the nozzle 34 is started after the spray opening 38 is inserted into the cavity 17. Then, spraying of the release lubricant from the spray opening 38 is started at the position and the moving speed of the nozzle 34 and the hydraulic pressure of the release lubricant set by the control unit 31, and the release lubricant is applied to a predetermined portion. As shown in fig. 5 (a), the spray opening 38 of the nozzle 34 sprays the mold release lubricant from the boundary 19 on the inner surface of the blank mold 10 to the end 10e on the die 11 side. Thereafter, the spray opening 38 maintains the spray of the release lubricant, and as shown in fig. 5 (B), the release lubricant is applied to the upper surface 11c of the die 11 with the pair of half dies 10a and 10B of the blank die 10 opened, and further, the release lubricant is applied to the inner surface of the die 11 by entering the space inside the die 11 as shown by an arrow D2A. Thereafter, spraying of the mold release lubricant from the spray opening 38 is stopped. Even when the blank molds 10a and 10b are opened in advance, the nozzle 34 sprays the mold release lubricant to the mouthpiece 11 in the same manner as described above. In the pattern a, when the mold release lubricant is sprayed onto the upper surface 11c of the die 11, the pair of half dies 10a and 10b are half-opened and are not completely opened.

In the case of the pattern a of the above (2), the release lubricant can be applied to the blank mold 10 and the mouthpiece 11 in a stable state in which the spray state of the release lubricant sprayed from the spray outlets 38 of the nozzles 34 is stable. Even if the die 11 is elongated, the release lubricant can be more reliably applied to the entire inner surface of the die 11 through the spray opening 38 of the nozzle 34.

Next, mode B of (2) will be described with reference to fig. 6 (a) and 6 (B).

Referring to fig. 6 (a), in this mode B, the pair of half molds 10a, 10B of the blank mold 10 may be initially closed or opened, but is preferably closed. It is preferable that the spraying of the release lubricant by the nozzle 34 is started after the spray opening 38 is inserted into the cavity 17. Then, spraying of the release lubricant from the spray opening 38 is started at the position and the moving speed of the nozzle 34 and the hydraulic pressure of the release lubricant set by the control unit 31, and the release lubricant is applied to a predetermined portion. As shown in fig. 6 (a), the spray opening 38 of the nozzle 34 sprays the release lubricant from the boundary 19 on the inner surface of the blank mold 10 to the end 10e on the die 11 side, and then temporarily stops spraying the release lubricant. Thereafter, as shown in fig. 6 (B), the spray opening 38 of the nozzle 34 enters the space inside the mouthpiece 11 in accordance with the opening of the pair of half molds 10a and 10B of the blank mold 10. Next, the spray opening 38 of the nozzle 34 sprays the mold release lubricant onto the inner surface of the die 11 and the upper surface 11c of the die 11 while rising as indicated by an arrow D2B. Thereafter, spraying of the mold release lubricant from the spray opening 38 is stopped. Even when the blank molds 10a and 10b are opened in advance, the nozzle 34 sprays the mold release lubricant to the mouthpiece 11 in the same manner as described above. In the pattern B, when the release lubricant is sprayed onto the upper surface 11c of the die 11, the pair of die halves 10a and 10B are completely opened.

In the case of the pattern B of the above (2), the spray opening 38 of the nozzle 34 can apply the release lubricant over a wide range in the upper surface 11c of the die 11. As a result, the slidability (ease of sliding) between the blank mold 10 and the die 11 can be further improved.

Next, mode C of (2) will be described with reference to fig. 7 (a), 7 (B), and 7 (C).

Referring to fig. 7 (a), in this mode C, the spray opening 38 of the nozzle 34 enters the space in the die 11 while stopping spraying of the release lubricant in a state where the pair of half dies 10a and 10b of the blank die 10 are open. Thereafter, as shown in fig. 7 (B), the spray opening 38 is moved upward toward the second region 42 as shown by an arrow D2C while spraying the mold release lubricant, and the spray is first sprayed toward the inner surface of the die 11 and then toward the upper surface 11c of the die 11. Next, referring to fig. 7 (C), the spray opening 38 sprays the release lubricant on the inner surface of the blank mold 10 during the closing of the pair of mold halves 10a, 10b as indicated by an arrow D2C'. Thereafter, spraying of the mold release lubricant from the spray opening 38 is stopped. At this time, at the end of the spraying of the release lubricant from the spray opening 38, the pair of mold halves 10a, 10b completes the closing.

In the case of the pattern C of the above (2), the spray opening 38 of the nozzle 34 can apply the release lubricant over a wide range on the upper surface 11C of the die 11. As a result, the slidability (ease of sliding) between the blank mold 10 and the die 11 can be further improved. Further, the time required for the closing operation of the blank mold 10 can be used to apply the release lubricant from the spray opening 38 to the blank mold 10. This can further shorten the wear time in the blank mold 10 (the time during which the blank 102 cannot be formed) associated with the application of the release lubricant.

Next, mode D of (2) will be described with reference to fig. 8 (a) and 8 (B).

Referring to fig. 8 (a), in the pattern D, the spraying of the release lubricant from the spray opening 38 is started at the position and the moving speed of the nozzle 34 and the hydraulic pressure of the release lubricant set by the control unit 31, and the release lubricant is applied to a predetermined portion. As shown in fig. 8 (a), the spray opening 38 of the nozzle 34 is first inserted into the die 11. Next, as shown in fig. 8 (B), the pair of half dies 10a and 10B of the blank die 10 is opened, and the mold release lubricant is sprayed and moved upward toward the second region 42 as shown by an arrow D2D, so that the coating is performed first on the inner surface of the die 11 and then on the upper surface 11c of the die 11. After that, the spraying of the mold release lubricant from the spray opening 38 is temporarily stopped. Next, as shown in fig. 8 (C), after the pair of half molds 10a and 10b are completely closed, the spray opening 38 is coated on the inner surface of the blank mold 10 while being moved upward as shown by an arrow D2D. Thereafter, spraying of the mold release lubricant from the spray opening 38 is stopped.

In the case of the pattern D of the above (2), the spray opening 38 of the nozzle 34 can apply the release lubricant over a wide range in the upper surface 11c of the die 11. As a result, the slidability (ease of sliding) between the blank mold 10 and the die 11 can be further improved. Further, the spray opening 38 can apply a release lubricant to the blank mold 10 in the closed state. This enables the spray opening 38 to more accurately apply the release lubricant to a desired portion of the blank mold 10.

Next, mode E of (2) will be described with reference to (a) of fig. 9 and (B) of fig. 9.

Referring to fig. 9 (a), in this mode E, as shown in fig. 9 (a), the pair of mold halves 10a, 10b are opened in advance. Next, while the pair of half dies 10a, 10b of the blank die 10 are closing as indicated by arrow D2E, the spray opening 38 of the nozzle 34 sprays the mold release lubricant from the boundary 19 in the inner surface of the blank die 10 to the end 10e on the die 11 side.

Thereafter, in the pattern E-1, the spray opening 38 keeps spraying the release lubricant, and in fig. 9 (B), the release lubricant is applied to the upper surface 11c of the die 11 with the pair of half dies 10a and 10B of the blank die 10 opened as indicated by the arrow D2E', and further, the release lubricant is applied to the inner surface of the die 11 by entering the space inside the die 11. Thereafter, spraying of the mold release lubricant from the spray opening 38 is stopped.

In the pattern E-2, after the release lubricant is sprayed onto the inner surface of the blank mold 10 (after the step (a) in fig. 9), the spray opening 38 of the nozzle 34 temporarily stops spraying of the release lubricant. Thereafter, in fig. 9 (B), the spray opening 38 of the nozzle 34 enters the space inside the die 11 in accordance with the opening of the pair of half dies 10a and 10B of the preliminary die 10 as indicated by the arrow D2E'. Next, the spray opening 38 sprays the release lubricant onto the inner surface and the upper surface 11c of the die 11 while rising. Thereafter, spraying of the mold release lubricant from the spray opening 38 is stopped.

In the case of the pattern E of the above (2), the release lubricant can be applied to the blank mold 10 from the spray opening 38 by utilizing the time required for the closing operation of the blank mold 10. This can further shorten the wear time in the blank mold 10 (the time during which the blank 102 cannot be formed) associated with the application of the release lubricant.

As described above, according to the present embodiment, the nozzle 34 of the coating device 5 coats the release lubricant so that the film thickness T1 of the release lubricant at the first region 41 is larger than the film thickness T2 (including zero) of the release lubricant at the corresponding second region 42. According to this configuration, the first region 41 set on the die 11 side is a region of the inner surface of the blank mold 10 that collides with the gob 101 while rubbing when the gob 101 is filled, and therefore, it is necessary to apply a release lubricant because it is necessary to have slidability. On the other hand, the second region 42 is set at a position farther from the die 11 than the first region 41, and therefore does not come into contact with the gob 101 when the gob 101 is filled. Therefore, in the second region 42, there is no necessity to apply the release lubricant in order to ensure the slidability with the gob 101. As described above, TG can reduce the wall thickness variation at the base of the vial by setting the film thickness T2 of the release lubricant in the second region 42 to be smaller than the film thickness T1 of the release lubricant in the first region 41.

In addition, according to the present embodiment, the release lubricant is not applied to the bottle bottom side forming portion 10 c. According to this configuration, since the deterioration of the close contact between the blank 102 and the blank 10 at the bottle bottom-side forming portion 10c is suppressed, the variation in the wall thickness of the bottle bottom portion can be reduced.

In addition, according to the present embodiment, the boundary 19 between the first region 41 and the second region 42 is set at a distance of 30% to 80% of the entire length a1 of the inner surface of the blank mold 10 from the one end 10e of the inner surface of the blank mold 10 on the side of the die 11. According to this configuration, by setting the boundary 19 to be equal to or higher than the lower limit value, the release lubricant can be more reliably applied to the portion of the blank mold 10 where the release lubricant needs to be sufficiently applied from the viewpoint of improving the sliding property. Further, by setting the position of the boundary 19 to the upper limit value or less, the wall thickness variation at the bottle root portion can be more reliably reduced.

In addition, according to the present embodiment, the first region 41 is set in a region from the position 18 corresponding to the main blowing line in the blank mold 10 to the one end 10e of the blank mold 10 on the mouthpiece 11 side. According to this configuration, the mold release lubricant can be reliably supplied to the portion of the inner surface of the blank mold 10 which is scraped by the gob 101 when the compressed air pressurizes the gob 101 toward the die 11 in the forward blowing step. On the other hand, the film thickness T2 of the mold release lubricant at a portion of the inner surface of the primary mold 10 having a low possibility of being scraped against the gob 101 in the positive-blowing process may be zero or a value smaller than the film thickness T1. This can further reduce the wall thickness variation at the bottle root.

In addition, according to the present embodiment, the controller 31 can control the actual release lubricant film thicknesses T1 and T2 by controlling the nozzle 34. Further, the control unit 31 can supply the release lubricant from the spray opening 38 toward the blank mold 10 while changing the position of the spray opening 38 of the nozzle 34 by operating the shift mechanism 32. This makes it possible to control the actual film thicknesses T1, T2 of the release lubricant in each portion of the inner surface of the blank mold 10.

Further, according to the present embodiment, when the ejection opening 38 of the nozzle 34 ejects the release lubricant while being shifted from the boundary 19 side between the first region 41 and the second region 42 toward the die 11 side, it is possible to more reliably prevent the unnecessary release lubricant from adhering to the second region 42. Further, when the ejection lubricant is sprayed from the spray opening 38 of the nozzle 34 while being shifted from the die 11 side toward the boundary 19 side, a more significant difference in film thickness is easily achieved at the boundary 19 between the first region 41 and the second region 42 (T1-T2).

< second embodiment >

Fig. 10 is a schematic view of a glass bottle manufacturing apparatus 1A according to a second embodiment of the present invention. Fig. 11 is a schematic view showing the coating device 5 and the blank mold 10a of the glass bottle manufacturing apparatus 1A. The vial manufacturing apparatus 1A (hereinafter also simply referred to as manufacturing apparatus 1A) is used to manufacture a vial 103A. The manufacturing apparatus 1A manufactures the glass bottle 103A by a press-and-blow method or a small-mouth press-and-blow method.

In the following description, the configuration different from the first embodiment will be mainly described, and the same configuration as that of the first embodiment may be denoted by the same reference numerals and detailed description thereof may be omitted.

Referring to fig. 10 and 11, the manufacturing apparatus 1A includes a preliminary mold portion 2A and an application device 5.

The blank mold part 2A is used for manufacturing a blank 102A as an intermediate product for manufacturing a glass bottle 103A. The gob 101A is supplied to the blank mold part 2A, and the blank mold part 2A forms the gob 101A into a blank 102A.

The blank mold part 2A includes a blank mold 10A as a blank mold for press molding, a die 11A, a plug 13A, and a punch 22A.

The inner surface of the blank mold 10A, which is a region for molding the gob 101A into a blank, of the blank mold 10A is coated with a coating layer by carbon coating or the like. And, a release lubricant is also periodically applied to the inner surface.

The blank mold 10A is used for molding the glass bottle 103A except for the bottle mouth portion 101 aA. The inner surface of the blank mold 10A forms a cavity 17A. The blank mold 10A has a pair of mold halves 10aA and 10bA facing each other in a direction orthogonal to the longitudinal direction L1. These mold halves 10aA, 10bA combine with each other, so that a cavity 17A is formed. In the present specification, the face of the blank mold 10A in which the cavity 17 is formed is referred to as an inner face of the blank mold 10A.

In the present embodiment, the chamber 17A has a shape in which wide portions and narrow portions are alternately arranged along the longitudinal direction L1. More specifically, the chamber 17A has: a first portion 61, adjacent to die 11A and of relatively narrow diameter; a second portion 62 having a relatively large diameter and a diameter that narrows after once increasing in diameter as it moves away from the die 11A from the first portion 61 along the length direction L1; and a third portion 63 continuous with the second portion 62 and having a diameter substantially the same as the diameter of the first portion 61. The upper end of the blank mold 10A includes a bottle bottom side forming portion 10 cA. The lower end 10dA of the blank mold 10A is formed in an upwardly concave shape, and the die 11A is disposed in the concave portion.

The die 11A is used for molding the mouth portion 101aA of the glass bottle 103A. The mouthpiece 11A is fitted to the lower end 10dA of the primary mold 10A. The upper surface 11cA of the die 11A faces the lower surface of the lower end 10dA of the blank die 10A. The punch 22A protruding from the die 11A blocks the lower end 10dA of the die 10A. The die 11A has a pair of die halves 11aA, 11bA facing each other in a direction orthogonal to the longitudinal direction L1, and these die halves 11aA, 11bA are combined with each other. A spiral groove or a concave-convex portion is formed on the inner surface of the die 11A.

The mold halves 10aA and 10bA are appropriately switched between an open state in which they are separated from each other and a closed state in which they are closed with each other by an opening/closing mechanism, not shown. Similarly, the mold halves 11aA and 11bA are switched to an open state in which they are separated from each other and a closed state in which they are closed with each other by an opening/closing mechanism, not shown.

The punch 22A is disposed so as to be surrounded by the die 11A, and is configured to be displaceable in the longitudinal direction L1 by a cylinder device or the like, not shown. The punch 22A has a conical portion whose tip is formed into a hemispherical shape, and is displaceable between a state of being inserted into the blank mold 10A and a state of being retracted.

In addition, a block piece 13A is provided, and this block piece 13A closes the upper end of the blank mold 10A.

The outline of the preliminary molding step performed by using the manufacturing apparatus 1A having the above-described configuration will be described below. In the blank mold step, first, as shown in fig. 12 (a), the cavity 17A of the blank mold 10A is filled with a gob 101A. At this time, the gob 101A collides with the inner surface of the narrow first portion 61 of the cavity 17A while rubbing, and is then caught by the punch 22A. Thereafter, as shown in fig. 12 (B), the plug 13A is attached to the blank mold 10A.

Subsequently, the punch 22A is pushed out toward the plug 13A, and the gob 101A is pressed between the blank die 10A and the punch 22A. Thereby, the whole gob 101A is pressed against the inner surface of the blank mold 10A, and the bottle mouth portion 101aA is formed, and the gob 101A becomes a blank 102A.

Referring to fig. 10 and 11, in the above-described step, a release lubricant is periodically applied to the inner surface of the blank mold 10A in order to ensure the slidability with the gob 101A and the releasability from the blank 102A. In order to apply the release lubricant, an application device 5 is used.

The displacement mechanism 32 of the coating device 5 is configured to be able to move the nozzle 34 in and out of the chamber 17A of the primary mold portion 2A. More preferably, the displacement mechanism 32 is configured to: when a plurality of blank mold portions 2A are provided, the nozzle 34 can be inserted into and removed from the cavity 17A of any blank mold portion 2A. The shift mechanism 32 can shift the nozzle 34 with respect to the mouthpiece 11A, and when a plurality of mouthpieces 11A are provided, the inner surface and the upper surface 11cA of any mouthpiece 11A can be sprayed. Thus, even if the die 11A is elongated, the release lubricant can be reliably applied to the entire inner surface of the die 11A.

The nozzle 34 may spray the release lubricant in a stationary state in the chamber 17A, or may spray the release lubricant while moving in the longitudinal direction L1 by the displacement mechanism 32. Preferably, the central axis of the nozzle 34 is arranged to coincide with the central axis of the chamber 17A.

In the present embodiment, the coating device 5 is configured to: the first region 41A set on the die 11A side in the inner surface of the blank mold 10A and the second region 42A set at a position farther from the die 10A than the first region 41A are coated with the mold-release lubricant so that the film thickness T1A of the mold-release lubricant in the first region 41A is larger than the film thickness T2A (including zero) of the mold-release lubricant in the second region 42A.

Specifically, when the glass bottle 103A is intermittently manufactured and the cavity 17A is not filled with the gob 101A, the nozzle 34 is inserted into the cavity 17A by the operation of the shift mechanism 32. Next, the nozzle 34 sprays the release lubricant at least to the first region 41A, so that the film thickness T1A of the release lubricant in the first region 41A is larger than the film thickness T2A (including zero) of the release lubricant in the second region 42A. For example, the relationship between the film thicknesses T1A and T2A can be achieved by making the flow rate from the coating device 5 the same and making the spraying time of the release lubricant to the first region 41A longer than the spraying time of the release lubricant to the second region 42A.

The first region 41A is set from the one end 10eA on the die 11A side in the inner surface of the primary die 10A to the narrow first portion 61. In this way, the first region 41A includes a region where the gob 101A collides while rubbing when the gob 101A is filled in the primary die for extrusion molding 10A.

The second region 42A is a region of the inner surface of the blank mold 10A other than the first region 41A. The second region 42A includes the bottle bottom-side forming portion 10cA of the blank mold 10A. In the present embodiment, the first region 41A and the second region 42A are each formed over the entire circumferential region of the inner surface of the blank mold 10A.

It is preferable that the boundary 19A between the first region 41A and the second region 42A is set within a range from 30% to 80% of the entire length A1A in the longitudinal direction L1 from the end 10eA of the inner surface of the blank mold 10A on the die 11aA side to the inner surface of the blank mold 10A. That is, the boundary 19A between the first region 41A and the second region 42A may be located 30% of the entire length A1A from the one end 10eA of the inner surface of the blank mold 10A, 80% of the entire length A1A from the one end 10eA of the inner surface of the blank mold 10A, or a position between these two positions.

The film thickness T1A of the die release lubricant at the first region 41A is set to such an extent that the die release lubricant does not sag in the first region 41A. The film thickness T2A of the release lubricant in the second region 42A may be smaller than the film thickness T1A of the release lubricant. In the present embodiment, the film thickness T2A of the release lubricant is set to zero. That is, the release lubricant is not applied to the second region 42A including the bottle bottom-side formation portion 10 cA.

The step of spraying the release lubricant to the blank mold portion 2A by the coating device 5 is the same as that of the first embodiment, and therefore, detailed description thereof is omitted.

As described above, according to the second embodiment, the wall thickness variation at the root of the bottle can be reduced as in the first embodiment.

In addition, according to the second embodiment, the first portion 61 where the gob 101A collides while rubbing when the gob 101A is filled in the blank mold 10A is defined as the first region 41A. Sufficient release lubricant can be supplied to the first region 41A where the sliding property is required due to the friction of the gob 101A.

The embodiments of the present invention have been described above. The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

In the above embodiment, the description has been given of the mode in which the release lubricant is applied by using the application device 5. However, this may not be the case. For example, the release lubricant may be applied by manual work of an operator. The application device 5 may apply the release lubricant using another application member such as a brush instead of the nozzle 34.