阅读说明：本技术 纺丝装置及纺丝方法 (Spinning device and spinning method ) 是由 塚本裕纪 灰塚真浩 于 2019-03-29 设计创作，主要内容包括：本发明涉及一种纺丝装置具备：纺丝筒,其沿上下方向延伸；喷丝头,其具有多个喷嘴孔,并且配置于纺丝筒的上端侧,该喷丝头将纺丝原液从喷嘴孔喷出至纺丝筒的内部空间；第一气体供给路,其与纺丝筒连接,以能够与从喷嘴孔喷出的纺丝原液接触的方式将第一气体从比喷丝头更上方供给至内部空间；以及第二气体供给路,其与纺丝筒连接,以能够与从喷嘴孔喷出的纺丝原液接触的方式将比第一气体高温的第二气体从比喷丝头更下方供给至内部空间。(The present invention relates to a spinning device, comprising: a spinning tube extending in the up-down direction; a spinneret having a plurality of nozzle holes and arranged on an upper end side of the spinning tube, the spinneret ejecting the spinning dope from the nozzle holes to an internal space of the spinning tube; a first gas supply path connected to the spinning tube, for supplying a first gas from above the spinneret to the internal space so as to be in contact with the spinning dope discharged from the nozzle holes; and a second gas supply path connected to the spinning tube, and configured to supply a second gas having a higher temperature than the first gas into the internal space from below the spinneret so as to be in contact with the spinning dope discharged from the nozzle holes.)

1. A spinning device is provided with:

a spinning tube extending in the up-down direction;

a spinneret having a plurality of nozzle holes, arranged on an upper end side of the spinning tube, and configured to discharge a spinning dope from the nozzle holes to an internal space of the spinning tube;

a first gas supply path connected to the spinning tube, for supplying a first gas from above the spinneret to the internal space so as to be in contact with the spinning liquid discharged from the nozzle holes; and

and a second gas supply path connected to the spinning tube, and configured to supply a second gas having a higher temperature than the first gas from below the spinneret to the internal space so as to be in contact with the spinning dope discharged from the nozzle holes.

2. The spinning device according to claim 1, further comprising a third gas supply path connected to the spinning tube below a position where the second gas is supplied to the spinning tube, the third gas supply path supplying a third gas to the internal space so as to be in contact with the spinning dope discharged from the nozzle holes.

3. The spinning apparatus of claim 2,

the spinning tube has a gas discharge port for discharging gas from the inner space to the outside of the spinning tube,

the gas discharge port is disposed between a position at which the second gas is supplied to the spinning tube and a position at which the third gas is supplied to the spinning tube.

4. The spinning apparatus according to any one of claims 1 to 3,

the first gas supply path is disposed so that a first gas can be supplied from above the spinneret to below the spinneret along the longitudinal direction of the spinning tube.

5. A method of spinning, the method comprising:

a spinneret having a plurality of nozzle holes is disposed on the upper end side of a spinning tube extending in the vertical direction, a spinning dope is discharged from the nozzle holes to an internal space of the spinning tube, a first gas is supplied from above the spinneret to the internal space so as to be in contact with the spinning dope passing through the nozzle holes, and a second gas having a higher temperature than the first gas is supplied from below the spinneret to the internal space so as to be in contact with the spinning dope discharged from the nozzle holes.

6. The spinning process of claim 5,

and a third gas is supplied to the internal space below a supply position of the second gas to the spinning tube so as to be in contact with the spinning liquid discharged from the nozzle hole.

7. The spinning process of claim 6,

and discharging the gas from the internal space to the outside of the spinning tube between a position where the second gas is supplied to the spinning tube and a position where the third gas is supplied to the spinning tube.

8. The spinning method according to any one of claims 5 to 7,

a first gas is supplied from above the spinneret to below the spinneret.

Technical Field

The present invention relates to a spinning apparatus and a spinning method.

Background

As disclosed in patent document 1, the spinning device includes a spinneret having a plurality of nozzle holes formed therein, and a spinning tube having the spinneret arranged on an upper end side and extending in a vertical direction. In the case of spinning by a spinning apparatus, for example, a spinning dope (dope) containing a raw material component of a filament and a volatile (solvent) component is ejected from each nozzle hole of a spinneret into a spinning tube. The spinning dope is dried by contacting with the gas supplied into the spinning tube. Thereby being spun into a plurality of filaments (monofilaments). A plurality of filaments are bundled into a yarn, and the yarn is wound up to a godet roll and then conveyed in a predetermined direction.

Disclosure of Invention

Problems to be solved by the invention

For the spinning apparatus, it is desired to improve the spinning efficiency so as to reduce the production cost. As a method for improving the spinning efficiency, for example, a method of increasing a draft ratio (draft) defined as a ratio of a take-up speed of a godet roller to a discharge speed of a spinning dope from a nozzle hole is cited. However, when only the winding speed is increased with respect to the discharge speed, the yarn breakage may occur in the spinning tube, and it may be difficult to increase the draft ratio.

Accordingly, an object of the present invention is to improve spinning efficiency by preventing yarn breakage in a spinning tube in a spinning device.

Means for solving the problems

One of the reasons why the yarn breakage occurs in the spinning tube in the case where the draft ratio is intended to be increased is considered to be due to: immediately after the dope is discharged from the spinneret, the volatile component of the dope is rapidly volatilized by the gas supplied into the spinning tube, and the dope becomes less likely to be stretched.

In view of this problem, it is known that if the supply amount of the gas supplied into the spinning tube per unit time is reduced or the temperature of the gas supplied into the spinning tube is reduced, the spinning dope is not sufficiently dried, and the spinning dopes discharged from the nozzle holes in the spinning tube come into contact with each other due to the swinging of the filament bundle, thereby causing filament breakage.

The present invention has been made based on such findings, and can satisfactorily stretch the dope immediately after being discharged from the nozzle hole, and can dry the dope while preventing yarn breakage caused by contact between a plurality of dopes in the spinning tube.

That is, a spinning device according to an embodiment of the present invention includes: a spinning tube extending in the up-down direction; a spinneret having a plurality of nozzle holes, arranged on the upper end side of the spinning tube, and configured to discharge a spinning dope from the nozzle holes to an internal space of the spinning tube; a first gas supply path connected to the spinning tube, for supplying a first gas from above the spinneret to the internal space so as to be in contact with the spinning dope discharged from the nozzle holes; and a second gas supply path connected to the spinning tube, and configured to supply a second gas having a higher temperature than the first gas from below the spinneret to the internal space so as to be in contact with the spinning dope discharged from the nozzle holes.

According to the above configuration, the spinning dope immediately after being discharged from the nozzle holes comes into contact with the first gas supplied from above the spinneret through the first gas supply path, and is dried relatively slowly. This prevents the dope immediately after being discharged from the nozzle hole from being dried rapidly, and the dope is drawn while preventing yarn breakage, so that the draft ratio can be increased.

Further, the spinning dope discharged from the nozzle holes comes into contact with the second gas supplied from below the spinneret through the second gas supply path, whereby drying is promoted. This makes it possible to dry the dope in the spinning tube while preventing a plurality of dopes during drying from contacting each other and causing yarn breakage. In addition, since the second gas and the first gas are supplied to the internal space of the spinning tube separately, the temperature and the supply amount of the first gas and the second gas can be easily controlled individually. This can improve spinning efficiency.

The spinning device may further include a third gas supply path connected to the spinning tube below a position where the second gas is supplied to the spinning tube, and configured to supply the third gas to the internal space so as to be in contact with the spinning solution discharged from the nozzle hole. Thus, the spinning dope dried to some extent by the second gas can be further dried by the third gas supplied from the third gas supply passage.

The spinning tube may have a gas discharge port for discharging gas from the internal space to the outside of the spinning tube, and the gas discharge port may be disposed between a position at which a second gas is supplied to the spinning tube and a position at which a third gas is supplied to the spinning tube.

In this way, the third gas can be made to flow from the lower side to the upper side in the internal space of the spinning tube from the position of the third gas supply port to the position of the gas discharge port, and the gas having a low volatile component concentration can be brought into contact with the spinning dope conveyed in the internal space, whereby the spinning dope can be dried efficiently.

The first gas supply path may be arranged so that the first gas can be supplied from above the spinneret to below the spinneret along the longitudinal direction of the spinning tube. Thus, the first gas can be used to slowly dry the spinning dope, and the draft ratio can be increased, while preventing the first gas from causing the first gas to oscillate and contact the spinning dopes immediately after the spinning dope is discharged from the nozzle hole.

In addition, the spinning method of other embodiments of the present invention includes: a spinneret having a plurality of nozzle holes is disposed on the upper end side of a spinning tube extending in the vertical direction, a spinning dope is discharged from the nozzle holes to the internal space of the spinning tube, a first gas is supplied from above the spinneret to the internal space so as to be in contact with the spinning dope passing through the nozzle holes, and a second gas having a higher temperature than the first gas is supplied from below the spinneret to the internal space so as to be in contact with the spinning dope discharged from the nozzle holes.

The third gas may be supplied to the internal space below a position where the second gas is supplied to the spinning tube so as to be in contact with the spinning liquid discharged from the nozzle hole.

The gas may be discharged from the internal space to the outside of the spinning tube between the upper and lower positions of the supply position of the second gas to the spinning tube and the supply position of the third gas to the spinning tube.

The first gas may be supplied from above the spinneret to below the spinneret.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to prevent yarn breakage from occurring in the spinning tube in the spinning device, thereby improving the spinning efficiency.

Drawings

Fig. 1 is an overall view of a spinning apparatus according to an embodiment.

Fig. 2 is a graph showing a relationship between the take-up speed of the godet roller and the maximum draft ratio.

Description of the symbols

D spinning stock solution

R1 first gas supply path

R2 second gas supply path

R3 third gas supply passage

S inner space

4 spinning tube

4d gas outlet

5 spinning jet

5a nozzle hole

Detailed Description

(embodiment mode)

Embodiments of the present invention will be described with reference to the drawings. Fig. 1 is an overall view of a spinning device 1 according to an embodiment. As an example, the spinning apparatus 1 spins the cellulose acetate fiber filament F by a dry spinning method.

The spinning apparatus 1 includes a mixing device 2, a filter device 3, a spinning tube 4, a spinneret 5, a first gas supply path R1, a second gas supply path R2, a third gas supply path R3, a gas discharge path R4, a diffuser 6, a finish oil immersion unit 7, a godet 8, and guide members 9 and 10. Although not shown in fig. 1, the spinning apparatus 1 of the present embodiment includes a plurality of spinning tubes 4, and the supply paths R1 to R3 are connected to the respective spinning tubes 4 so as to be branched.

The mixing device 2 mixes the spinning dope D. The dope D contains a raw material component of the filament F and a volatile component. For example, the raw material component of the filament F is cellulose acetate, and the volatile component is acetone. The filtration device 3 filters the spinning dope D mixed by the mixing device 2.

The spinning tube 4 extends in the vertical direction. In the spinning tube 4, a first gas supply port 4a, a second gas supply port 4b, a third gas supply port 4c, a gas discharge port 4d, and a filament carrying-out port 4e are provided in a spaced manner in the longitudinal (vertical) direction of the spinning tube 4. The second gas supply port 4b, the third gas supply port 4c, and the gas discharge port 4d are disposed on the side of the spinning tube 4.

The first gas supply port 4a is disposed at the upper end of the spinning tube 4 and connected to the first gas supply path R1. The second gas supply port 4b is disposed below the lower end of the spinneret 5 and connected to the second gas supply path R2. The third gas supply port 4c is disposed below the second gas supply port 4b and connected to the third gas supply passage R3.

The gas discharge port 4d is disposed between the upper and lower parts of the supply position of the second gas to the spinning tube 4 and the supply position of the third gas to the spinning tube 4 (in other words, between the upper and lower parts of the second gas supply port 4b and the third gas supply port 4 c), and discharges the gas from the internal space S to the outside of the spinning tube 4. The gas discharge port 4d is connected to the gas discharge passage R4. The filament transport port 4e is disposed at the lower end of the spinning tube 4, and transports the filaments F spun in the spinning tube 4 to the outside of the spinning tube 4.

Specifically, the second gas supply port 4b is disposed above the center of the spinning tube 4 in the longitudinal direction. In addition, for example, the second gas supply port 4b is disposed below a central position P1 between the upper end of the spin tube 4 and the upper end of the gas discharge port 4 d. The upper end of the second gas supply port 4b is located below the lower end of the spinneret 5. The upper end of second gas supply port 4b is preferably disposed at a position below the upper end of spinning tube 4 by a distance in the range of 2 to 3 of the length dimension of spinning tube 4.

The gas discharge port 4d is disposed below the center of the spinning tube 4 in the longitudinal direction. For example, the gas discharge port 4d is disposed at a position overlapping with a center position P2 between the lower end of the second gas supply port 4b and the upper end of the third gas supply port 4 c.

The length from the upper end of the spinning tube 4 to the upper end of the gas discharge port 4d is longer than the length from the lower end of the second gas supply port 4b to the upper end of the third gas supply port 4c of the spinning tube 4. The length from the upper end of the spinning tube 4 to the upper end of the second gas supply port 4b is longer than the length from the lower end of the spinning tube 4 to the lower end of the third gas supply port 4 c.

The spinneret 5 has a plurality of nozzle holes 5a and is disposed on the upper end side of the spinning tube 4. The spinneret 5 discharges the spinning dope D from the nozzle holes 5a into the internal space S of the spinning tube 4. The spinning device 1 pressurizes the spinning dope D by the pump 11, and ejects the spinning dope D from the nozzle holes 5 a. The discharge speed V1 at which the spinning dope D is discharged from the nozzle hole 5a can be set by adjusting the pump 11.

The first gas supply path R1 is connected to the spinning tube 4, and supplies the first gas from above the spinneret 5 to the internal space S so as to be in contact with the spinning dope D discharged from the nozzle holes 5 a. In the present embodiment, the first gas supply port 4a of the spinning tube 4 connected to the first gas supply path R1 is disposed above the spinneret 5 in the internal space S of the spinning tube 4. Thus, the first gas supply path R1 is disposed so that the first gas can be supplied from above the spinneret 5 to below the spinneret 5 along the longitudinal direction of the spinning tube 4. The temperature of the first gas to be supplied to the internal space S is set to a value in a range of 60 ℃ to 70 ℃, for example.

The second gas supply path R2 is connected to the spinning tube 4, and supplies a second gas having a higher temperature than the first gas from below the spinneret 5 to the internal space S so as to be in contact with the spinning dope D discharged from the nozzle holes 5 a. In the present embodiment, second gas supply passage R2 is disposed so that the second gas can be supplied from the side surface of spinning tube 4 to internal space S of spinning tube 4. The temperature of the second gas to be supplied to the internal space S is set to a temperature higher than 70 ℃, for example, and is set to a value in a range of 90 ℃ to 95 ℃.

The amount of the second gas supplied to the interior space S per unit time is set to a value equal to or higher than the amount of the first gas supplied to the interior space S per unit time, for example. As an example, the supply amount of the second gas per unit time to the internal space S is set to a value in a range of 100% to 143% of the supply amount of the first gas per unit time to the internal space S.

The third gas supply path R3 is connected to the spinning tube 4 below the position of supply of the second gas to the spinning tube 4, and supplies the third gas to the internal space S so as to be in contact with the spinning dope D discharged from the nozzle holes 5 a. In the present embodiment, the third gas to be supplied to the internal space S has a higher temperature than the first gas. Further, third gas supply passage R3 is disposed so that the third gas can be supplied from the side surface of spinning tube 4 to internal space S of spinning tube 4. The third gas may be at a higher temperature than the second gas or at a lower temperature than the second gas. Here, the first to third gases are drying gases for drying the spinning dope D, and examples of the first to third gases are all air.

The discharge passage R4 is connected to the spinning tube 4 between the upper and lower positions of the supply position of the second gas to the spinning tube 4 and the supply position of the third gas to the spinning tube 4, and discharges the gas from the internal space S of the spinning tube 4.

The diffuser 6 is provided below the spinneret 5, and supplies the second gas supplied to the inner space S of the spinning tube 4 to the inside in the radial direction of the spinning tube 4 while diffusing the second gas. The diffuser 6 is a cylindrical body, and is disposed in the internal space S in a state where the cylindrical axis direction coincides with the longitudinal direction of the spinning tube 4. A plurality of openings 6a are formed in the peripheral surface of the diffuser 6. The second gas is supplied to the inside in the radial direction of the diffuser 6 while diffusing by passing through the opening 6a of the diffuser 6.

In the case where the second gas is sufficiently diffused in the internal space S without using the diffuser 6, the diffuser 6 may be omitted. The finish impregnation unit 7 impregnates the spun filaments F with a fiber finish (a fiber finish emulsion, for example).

The godet roller 8 is axially supported so as to be rotatable about its roller shaft. The godet roller 8 rotates by a driving force transmitted from a driving device 12 and contacts the filament F on the peripheral surface thereof, thereby conveying the filament F to the guide members 9 and 10. The rotational speed (take-up speed) V2 of the godet roller 8 is adjusted by the drive device 12.

In the spinning device 1, the draft ratios V2/V1 are adjusted by individually adjusting the speeds V1 and V2. The draft ratio V2/V1 can be set as appropriate, but by setting the draft ratio to a value greater than 1.0, the spinning dope D discharged from the nozzle holes 5a of the spinneret 5 is stretched in the transport direction. In the present embodiment, the draft ratio V2/V1 is set to a value greater than 1.0, for example. The guide members 9 and 10 guide the filaments F carried out from the godet roller 8 in a predetermined direction.

The spinning method of the present embodiment performs spinning using the spinning device 1 having the above-described configuration. That is, the spinneret 5 is disposed on the upper end side of the spinning tube 4, the spinning dope D is discharged from the nozzle holes 5a to the internal space S of the spinning tube 4, and the first gas is supplied from above the spinneret 5 to the internal space S so as to be in contact with the spinning dope D having passed through the nozzle holes 5 a.

Further, the second gas having a higher temperature than the first gas is supplied from below the spinneret 5 to the internal space S so as to be in contact with the spinning dope D discharged from the nozzle holes 5 a. For example, the first gas is supplied from above the spinneret 5 to below the spinneret 5.

Further, the third gas is supplied to the internal space S below the position of supply of the second gas to the spinning tube 4 so as to be in contact with the spinning dope D discharged from the nozzle holes 5 a. Further, the gas is discharged from the inner space S to the outside of the spinning tube 4 between the supply position of the second gas to the spinning tube 4 and the upper and lower positions of the supply position of the third gas to the spinning tube 4.

Specifically, when the spinning device 1 is driven, the spinning dope D passed through the mixing device 2 and the filtering device 3 is discharged from the nozzle holes 5a of the spinneret 5 toward the internal space S of the spinning tube 4 from above to below by the driving force of the pump 11. Further, the first gas is supplied from the first gas supply passage R1 to the internal space S of the spinning tube 4 through the first gas supply port 4 a.

In order to slowly dry the spinning dope D immediately after being ejected from the nozzle holes 5a, the temperature of the first gas to be supplied to the internal space S is set to be lower than the temperature of the second gas to be supplied to the internal space S. Therefore, the volatile component of the dope D is partially volatilized by the first gas immediately after the dope D is discharged from the nozzle holes 5a, but remains in the dope D to such an extent that the dope D is drawn in accordance with the value of the draft ratio V2/V1 set in advance. Thus, in the spinning device 1, the spinning dope D discharged from the nozzle holes 5a is stretched stably in the conveyance (vertical) direction while being dried slowly by the first gas.

Here, when the winding speed V2 is increased while the supply amount of the spinning dope D to the spinneret 5 is kept constant, the diameter of the spinning dope D discharged from the nozzle holes 5a becomes smaller. Further, the filament F spun from the spinning dope D cannot be stably wound by the godet roller 8. The ratio V2/V1 at the time when winding by the godet roller 8 becomes impossible is defined as the maximum draft ratio.

In the present embodiment, since the dope D immediately after being discharged from the nozzle holes 5a can be stably drawn, the maximum draft ratio V2/V1 can be increased. Thus, for example, the maximum draft ratio V2/V1 when the winding speed V2 is set to be equal to that in the conventional art can be increased, and the decrease in the maximum draft ratio V2/V1 can be suppressed even when the winding speed V2 is set to be higher than that in the conventional art.

Further, the second gas is supplied from the second gas supply passage R2 to the internal space S through the second gas supply port 4 b. The second gas is in contact with the spinning dope D while being diffused in the internal space S by the diffuser 6. Since the second gas has a higher temperature than the first gas, the volatilization of the volatile component of the dope D can be promoted by bringing the dope D into contact with the second gas.

When the volatilization of the volatile component of the dope D proceeds to a certain extent, a coating film is formed on the dope D, and the dope D solidifies to form the filament F. In the present embodiment, the volatilization of the volatile component of the dope D is promoted by bringing the second gas having a higher temperature than the first gas into contact with the dope D, so that the plurality of dopes D discharged from the plurality of nozzle holes 5a are prevented from coming into contact with each other by the gas flowing through the internal space S and causing yarn breakage (yarn breakage due to the yarn bundle swinging) and the plurality of filaments F are favorably formed.

Further, the third gas is supplied from the third gas supply passage R3 to the internal space S through the third gas supply port 4 c. In the spinning tube 4, since the gas discharge port 4d is disposed above the third gas supply port 4c, the third gas flows from the second gas supply port 4b to the gas discharge port 4d from the lower side to the upper side in the internal space S.

Therefore, the filaments F being conveyed can be brought into contact with the third gas in a state where the volatile component concentration is low by the countercurrent drying in the internal space S, and thus the drying can be further promoted. The first to third gases containing volatile components are discharged from the gas discharge port 4d to the outside of the spinning tube 4, and are circulated through the discharge passage R4 and then recovered.

Here, in the internal space S, the first gas flows downward from above, and the second gas is mixed with the first gas and flows downward from above. For example, the region between the second gas supply port 4b and the gas discharge port 4d of the internal space S includes a region where the flow velocity of the gas in the internal space S is the highest. In addition, for example, the region between the upper end of the spinning tube 4 and the second gas supply port 4b in the internal space S includes a region where the flow velocity of the gas in the internal space S reaches the lowest velocity.

The filaments F carried out from the filament carrying-out port 4e of the spinning tube 4 are collected into a yarn Y. The yarn Y is impregnated with a fiber finish by the finish impregnation unit 7, and then wound by the godet roller 8. The yarn Y is guided by the guide members 9 and 10 and then conveyed in a predetermined direction after running around the peripheral surface of the godet 8.

The third gas supply port 4 is disposed below the gas discharge port 4d as an example, but may be disposed below the second gas supply port 4b and above the gas discharge port 4 d. In addition, when the volatilization of the volatile component of the spinning dope D can be sufficiently performed by the first and second gases, the third gas supply port 4c and the third gas supply passage R3 may be omitted. In the case where the third gas is not used, the gas discharge port 4d and the discharge passage R4 may be omitted,

as described above, in the present embodiment, the spinning dope D immediately after being discharged from the nozzle holes 5a is dried relatively slowly by being brought into contact with the first gas supplied from above the spinneret 5 through the first gas supply passage R1. This prevents the dope D immediately after being discharged from the nozzle holes 5a from being dried rapidly, and the dope D can be drawn while preventing yarn breakage, so that the draft ratio V2/V1 can be increased.

Further, the drying can be promoted by bringing the spinning dope D discharged from the nozzle holes 5a into contact with the second gas supplied from below the spinneret 5 through the second gas supply path R2. This makes it possible to dry the dope D in the spin tube 4 while preventing the dope D from contacting each other and causing yarn breakage during drying. In addition, since the second gas and the first gas are supplied to the internal space S of the spinning tube 4 separately, the temperature and the supply amount of the first gas and the second gas can be easily controlled individually. This can improve spinning efficiency.

Further, since the spinning device 1 includes the third gas supply passage R3, the spinning dope D dried to some extent by the second gas can be further dried by the third gas supplied from the third gas supply passage R3.

Further, since the gas discharge port 4D of the spinning tube 4 is disposed between the supply position of the second gas to the spinning tube 4 and the supply position of the third gas to the spinning tube 4, the third gas can be made to flow upward from below from the supply position of the third gas to the position of the gas discharge port 4D in the internal space S of the spinning tube 4, and the gas having a low volatile component concentration can be brought into contact with the spinning dope D conveyed in the internal space S, whereby the spinning dope D can be dried efficiently.

Further, since the first gas supply passage R1 is disposed so that the first gas can be supplied from above the spinneret 5 to below the spinneret 5 along the longitudinal direction of the spinning tube 4, the first gas can be used to slowly dry the spinning dope D and increase the draft ratio V2/V1 while preventing the spinning dope D immediately after being discharged from the nozzle holes 5a from contacting each other due to the strand fluttering of the first gas.

(concerning the relationship between the take-up speed V2 of the godet roll 8 and the maximum draft ratio V2/V1)

Fig. 2 is a graph showing the relationship between the take-up speed V2 of the godet roller 8 and the maximum draft ratio V2/V1. Fig. 2 shows a relationship between the take-up speed V2 of the godet roll 8 and the maximum draft ratio V2/V1 when the filament F is spun by setting the temperature of the second gas supplied to the internal space S and the supply amount of the second gas per unit time to different values using the spinning device 1 in which the first gas supply port 4a is closed and the position of the second gas supply port 4b is changed to the position of the side surface of the spinning tube 4 overlapping the spinneret 5. The spinneret 5 has 100 triangular nozzle holes 5 a.

In fig. 2, the supply amount of the second gas per unit time to the internal space S is the same for settings a to C, and the temperature of the second gas supplied to the internal space S decreases in the order of A, B, C. The temperatures of the second gases supplied to the internal space S are equal for the settings C to E, and the supply amount of the second gas per unit time to the internal space S is decreased in the order of the setting C, D, E.

As shown in fig. 2, in any of the settings a to E, the maximum draft ratio V2/V1 decreases when the winding speed V2 increases. The reason for this is considered to be that, for example, the tension acting on the spinning dope D discharged from the nozzle holes 5a in the transport direction is increased, and yarn breakage is likely to occur.

In any of the settings a to E, the maximum draft ratio V2/V1 decreases when the temperature of the second gas supplied to the internal space S increases. This is considered to be because, for example, the spinning dope D immediately after being discharged from the nozzle holes 5a is rapidly dried by the second gas having a relatively high temperature, and is less likely to be drawn, and thus yarn breakage is likely to occur.

As shown in settings C and D, even if the temperature of the second gas supplied to the internal space S is equal to the winding speed V2, the maximum draft ratio V2/V1 decreases when the amount of the second gas supplied to the internal space S per unit time is large. This is considered to be because, for example, the spinning dope D immediately after being discharged from the nozzle holes 5a is dried rapidly by a relatively large amount of the second gas, and is less likely to be drawn, and thus yarn breakage is likely to occur.

In contrast, in the spinning device 1 of the present embodiment, since the dope D immediately after being discharged from the nozzle holes 5a is dried slowly by the first gas having a lower temperature than the second gas, the dope D is easily drawn in the carrying direction, and therefore, the maximum draft ratio V2/V1 at the winding speed V2 equivalent to the conventional one can be increased. Thus, even when the winding speed V2 is increased, the decrease in the maximum draft ratio V2/V1 can be suppressed as compared with the conventional art. Therefore, by preventing the yarn breakage from occurring in the spinning tube 4, the spinning efficiency can be improved.

(confirmation test)

A spinning tube 4 shown in fig. 1 was produced as an example. A spinning tube having the same configuration as in example was produced as a comparative example, except that the first gas supply port 4a of the spinning tube 4 was closed and the position of the second gas supply port 4b was changed to the position of the side face of the spinning tube 4 overlapping the spinneret 5.

The same spinneret 5 was disposed at the upper end of the spinning devices of examples and comparative examples, and spinning was performed using the same spinning dope D. As a result, in the examples, the shortage of drying of the spinning dope D after being discharged from the nozzle holes 5a was suppressed to the same extent as in the comparative examples, and the winding speed V2 was increased by about 23.7% as compared with the comparative examples while keeping the maximum draft ratio V2/V1 constant. From this, it is understood that the maximum draft ratio V2/V1 is more easily increased in the examples than in the comparative examples.

Further, according to another study by the present inventors, it is found that, as the position of the gas discharge port 4D is moved to the lower side of the spin tube 4 between the second gas supply port 4b and the third gas supply port 4c, the yarn bundle of the dope D is less likely to be oscillated by the second gas, and the maximum draft ratio V2/V1 is more likely to be increased. However, it is also found that the drying of the dope D is more likely to be slowed as the position of the gas discharge port 4D is moved to the lower side of the spinning tube 4. From this, it is considered that the gas discharge port 4d is preferably arranged at an appropriate position of the spinning tube 4 according to the raw material composition of the filament F to be spun, the Filament Denier (FD), the velocities V1, V2, and the like.

It is also found that, as the position of the second gas supply port 4b is moved to the upper side of the spinning tube 4, drying of the dope D conveyed in the internal space S is promoted by the second gas, and yarn breakage due to contact between the plurality of dopes D can be easily prevented. From this, it is considered that the position of the second gas supply port 4b is preferably arranged above the spinning tube 4 in a range where the slow drying of the dope D by the first gas can be performed.

The present invention is not limited to the embodiments, and modifications, additions, or deletions may be made to the configurations and methods without departing from the spirit of the invention.

Industrial applicability

As described above, the present invention has an excellent effect of improving spinning efficiency by preventing yarn breakage from occurring in the spinning tube in the spinning device. Therefore, it is advantageous to widely apply the present invention to spinning apparatuses that can exhibit such effects.