阅读说明：本技术 一种异形截面瓶坯结构及其形成方法 (Special-shaped section bottle blank structure and forming method thereof ) 是由 谢国基 姜晓平 胡青春 罗国泉 陈境钰 卢佳 于 2020-06-09 设计创作，主要内容包括：本发明公开一种异形截面瓶坯结构及其形成方法,异形截面瓶坯结构的坯身包括环形截面段、截面变化段、异形截面段,异形截面段具有异形截面,异形截面由内闭合线和外闭合线构成,内闭合线与外闭合线之间的最短距离为瓶坯结构的壁厚,与异形截面瓶坯结构的长度相等、克重相等的环形截面瓶坯结构相比,其中,环形截面瓶坯结构具有圆环形截面,异形截面瓶坯结构的吹瓶拉伸比保持与环形截面瓶坯结构的吹瓶拉伸比相等的前提下,异形截面的周长大于圆环形截面的周长,且异形截面瓶坯结构的壁厚小于环形截面瓶坯结构的壁厚。该异形截面瓶坯结构能有效缩短瓶坯注塑成型的冷却时间,以及吹瓶前的预加温时间,从而缩短了瓶子的整个加工周期,提高了生产效率。(The invention discloses a special-shaped section bottle blank structure and a forming method thereof, wherein a blank body of the special-shaped section bottle blank structure comprises an annular section, a section changing section and a special-shaped section, the special-shaped section is provided with a special-shaped section, the special-shaped section is composed of an inner closing line and an outer closing line, the shortest distance between the inner closing line and the outer closing line is the wall thickness of the bottle blank structure, and compared with the annular section bottle blank structure with the same length and the same gram weight as the special-shaped section bottle blank structure, the annular section bottle blank structure is provided with a circular ring-shaped section, the circumference of the special-shaped section is larger than the circumference of the circular ring-shaped section on the premise that the bottle blowing stretch ratio of the special-shaped section bottle blank structure is equal to the bottle blowing stretch ratio of the annular section bottle blank structure, and the wall thickness of. The special-shaped cross-section bottle blank structure can effectively shorten the cooling time of the injection molding of the bottle blank and the preheating time before bottle blowing, thereby shortening the whole processing period of the bottle and improving the production efficiency.)

1. The utility model provides a dysmorphism cross section bottle base structure, includes at the bottom of bottleneck, base body, the base, its characterized in that:

the blank body comprises an annular section, a section change section and a special-shaped section, the annular section is connected with the bottle mouth, the special-shaped section is connected with the blank bottom, the section change section is a transition section between the annular section and the special-shaped section,

the special-shaped section is provided with a special-shaped section, the special-shaped section is composed of an inner closing line and an outer closing line, the shortest distance between the inner closing line and the outer closing line is the wall thickness of the bottle blank structure,

compared with the annular-section bottle blank structure with the same length and the same gram weight of the special-shaped-section bottle blank structure, the annular-section bottle blank structure is provided with an annular section, the circumference of the special-shaped section is larger than that of the annular section on the premise that the bottle blowing stretching ratio of the special-shaped-section bottle blank structure is equal to the bottle blowing stretching ratio of the annular-section bottle blank structure, and the wall thickness of the special-shaped-section bottle blank structure is smaller than that of the annular-section bottle blank structure.

2. The shaped cross-section preform structure of claim 1, wherein the shaped cross-section of the shaped cross-section preform structure has an area equal to an area of the annular cross-section preform structure.

3. The shaped cross-section preform structure of claim 2, wherein the outer closure line of the shaped cross-section comprises a plurality of peaks and valleys.

4. The profiled cross-section bottle preform structure of claim 3, wherein the outer closed line of the profiled cross-section is corrugated or dog-leg shaped.

5. The profiled cross-section bottle preform structure of claim 4, wherein the inner closed line of the profiled cross-section is circular, corrugated or dog-leg shaped.

6. The profiled cross-section bottle preform structure of claim 1, wherein said preform base comprises a circular arc variation section and a spherical section, said circular arc variation section being connected to said profiled cross-section.

7. A method for forming a bottle blank structure with a special-shaped section is characterized by comprising the following steps:

s1 provides a conventional bottle blank structure, which comprises a bottle mouth, a blank body and a blank bottom, wherein the blank body is hollow and cylindrical and has a circular ring-shaped section formed by an outer closed line and an inner closed line,the outer diameter and the inner diameter of the circular ring are m and n respectively, and the area of the circular ring cross section is S_{Ring (C)}；

S2, at least changing the shape of the outer closed line of the circular ring-shaped section, so that the outer closed line has a plurality of wave crests and wave troughs, thereby forming a special-shaped section,

specifically, the number of wave crests is preset, an included angle theta between the connecting line of the wave crests and the wave troughs and the center of the circular ring shape is obtained, and a special-shaped section model is established on the premise that the area of the special-shaped section is not changed relative to the area of the circular ring-shaped section;

s3, obtaining a bottle blank structure with a special-shaped section according to the special-shaped section model, wherein the gram weight and the bottle blowing stretch ratio of the bottle blank structure with the special-shaped section are equal to those of the conventional bottle blank structure, but the section perimeter of the bottle blank structure with the special-shaped section is larger than that of the conventional bottle blank structure, and the wall thickness of the bottle blank structure with the special-shaped section is smaller than that of the conventional bottle blank structure.

8. The method for forming a shaped cross-section bottle preform structure as claimed in claim 7, wherein the outer closed line shape of the circular ring-shaped cross-section is changed into a corrugated shape or a dogleg shape.

9. The method for forming a bottle preform structure with a profiled cross section as claimed in claim 8, wherein the shape of the inner closed line of the circular cross section is changed into a corrugated shape or a dogleg shape.

10. The method for forming a shaped cross-section bottle preform structure as claimed in claim 7, wherein the outer closing line and the inner closing line of the circular ring-shaped cross-section are changed into an outer folding line and an inner folding line which are parallel to each other.

Technical Field

The invention relates to the technical field of bottle blanks, in particular to a bottle blank structure with a special-shaped section.

Background

Due to the characteristics of high efficiency and manufacturability of injection molding, injection molding has become the most common method for manufacturing plastic products, and has a very important position in the plastic processing industry. The cooling is the most important stage in the injection molding process, and has a great influence on the quality and the production efficiency of the product, the cooling time occupies about 2/3 of the whole injection molding time, and the cooling time is a key influence on the product forming period and the energy consumption. At present, the research on the cooling technology for accelerating the formed part at home and abroad mainly focuses on accelerating the heat dissipation part of the mold, however, because the heat conductivity coefficient of the bottle blank material is extremely small, the self heat resistance is far greater than the heat resistance of a cooling system and the mold in the cooling process, the self heat resistance of the bottle blank is the main factor influencing the cooling efficiency, and the reduction of the cooling time is substantially limited by improving the heat exchange coefficient of cooling water and the heat conductivity coefficient of the mold material in the prior art.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a bottle blank structure with a special-shaped cross section, which is designed from a bottle blank, and accelerates the cooling time of injection molding by changing the structural shape of the bottle blank.

In order to achieve the purpose, the invention adopts the following technical scheme:

a bottle blank structure with a special-shaped section comprises a bottle mouth, a blank body and a blank bottom, wherein the blank body comprises an annular section, a section changing section and a special-shaped section, the annular section is connected with the bottle mouth, the special-shaped section is connected with the blank bottom, the section changing section is a transition section between the annular section and the special-shaped section,

the special-shaped section is provided with a special-shaped section, the special-shaped section is composed of an inner closing line and an outer closing line, the shortest distance between the inner closing line and the outer closing line is the wall thickness of the bottle blank structure,

compared with the annular-section bottle blank structure with the same length and the same gram weight of the special-shaped-section bottle blank structure, the annular-section bottle blank structure is provided with the annular section, the circumference of the special-shaped section is larger than that of the annular section on the premise that the bottle blowing stretching ratio of the special-shaped-section bottle blank structure is equal to the bottle blowing stretching ratio of the annular-section bottle blank structure, and the wall thickness of the special-shaped-section bottle blank structure is smaller than that of the annular-section bottle blank structure.

The invention improves the conventional bottle blank structure with the annular cross section in the prior art, keeps the length and the gram weight of the bottle blank unchanged while improving, changes the bottle blank structure with the annular cross section into the bottle blank structure with the special-shaped cross section, and compared with the annular cross section of the bottle blank structure with the annular cross section, the special-shaped cross section of the bottle blank structure with the special-shaped cross section has the same cross section area, increased cross section circumference and reduced bottle blank wall thickness, and the characteristics of the invention ensure that the bottle blank structure with the special-shaped cross section has the following beneficial effects:

(1) because the circumference of the section is increased, the contact area of the bottle blank and the blowing mold is increased, thereby shortening the cooling time of injection molding of the bottle blank, shortening the whole injection molding period and improving the production efficiency of the bottle blank;

(2) the wall thickness of the bottle blank is reduced, so that the heat conductivity of the bottle blank is better, the bottle blank is more uniformly preheated before blow molding, and the heating time is shortened, so that the energy consumption in the preheating process is reduced;

(3) the invention changes the bottle blank structure with the annular section into the bottle blank structure with the special-shaped section, but the stretch ratio of the bottle blank is kept unchanged, so the blow molding performance of the bottle blank is not changed, and the quality of a bottle formed by blow molding is not influenced.

Drawings

The present invention will be further described and illustrated with reference to the following drawings.

Fig. 1a is a schematic representation of a prior art bottle preform.

FIG. 1b is a cross-sectional view A-A of FIG. 1 a.

Fig. 2 is a schematic diagram of the structure of the bottle preform with the irregular cross section of the invention.

FIG. 3a is a sectional view of a deformed cross-sectional segment of the deformed cross-sectional bottle preform structure of example 1.

Fig. 3b is a schematic diagram of the modeling of the profiled cross-section of fig. 3 a.

FIG. 4a is a sectional view of a deformed cross-sectional portion of the deformed cross-sectional preform structure in example 2.

Fig. 4b is a schematic diagram of the modeling of the profiled cross-section of fig. 4 a.

FIG. 5a is a sectional view of a shaped section segment of the shaped section preform structure in example 3.

Fig. 5b is a schematic diagram of the modeling of the profiled cross-section of fig. 5 a.

Fig. 5c is a partial enlarged view of fig. 5 b.

FIG. 6a is a sectional view of a shaped section segment of the shaped section preform structure in example 4.

Fig. 6b is a schematic modeling diagram of the profiled cross-section of fig. 6 a.

Fig. 7 is a graph of cooling temperature data for prior art preforms and preforms of the present invention during injection molding testing.

Fig. 8 is an infrared cloud of cooling temperatures of prior art bottle preforms and bottle preforms of the present invention during injection molding testing.

Fig. 9 is an infrared cloud of the heating temperature of prior art preforms and preforms of the present invention in a blow molding test.

Detailed Description

The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

The prior art shown in fig. 1a and 1b is a conventional preform structure, and the conventional preform structure 10 ' includes a bottle opening 1 ', a body 2 ', and a base 3 ', and the body 2 ' is located between the bottle opening 1 ' and the base 3 '. As shown in fig. 1b, when the blank 2 ' has a circular cross section, the outer diameter of the circular cross section is m, the inner diameter of the circular cross section is n, the thickness t ' of the blank 2 ' is m-n, and the area of the circular cross section is:

in order to shorten the cooling time of plastic bottle injection molding, the invention researches and designs the shape of a bottle blank structure.

As shown in fig. 2, the bottle preform structure 20 with a special-shaped cross section of the present invention includes a bottle mouth 1, a preform body 2, and a preform bottom 3, wherein the preform body 2 is located between the bottle mouth 1 and the preform bottom 3. Specifically, the blank body 2 includes a ring-shaped section 21, a section changing section 22, and a deformed section 23. Wherein, the ring-shaped section 23 is connected with the bottle mouth 1 and has a ring-shaped section shape; the shaped section segment 23 is connected to the blank bottom 3 and has a shaped cross-sectional shape, where "shaped" is a cross-sectional shape different from the circular cross-sectional shape with respect to the circular shape; the cross-sectional variation 22 is a transition between the annular cross-sectional section 21 and the profiled cross-sectional section 23, which transitions from a circular shape to a profiled contour.

The blank bottom 3 comprises an arc changing section 31 and a spherical section 32, wherein the arc changing section 31 is connected with the special-shaped section 23, gradually changes from a special-shaped contour to a circular contour, and is in arc transition connection with the spherical section 32. The maximum diameter d of the spherical segment 32 is not less than φ 8.

The principle of shortening the cooling time of injection molding of the invention is as follows: on the premise of not changing the gram weight of the conventional bottle blank, the cross section perimeter of the bottle blank structure is increased and the wall thickness of the bottle blank is reduced by changing the cross section shape of the bottle blank, so that the contact area between the bottle blank and a bottle blowing mold is substantially increased, the cooling time is shortened, the injection molding period and even the whole production period are shortened, the energy consumption is reduced, and the production efficiency is improved.

Based on the principle, the invention provides several embodiments of the bottle blank structure with the special-shaped section, and the embodiments are described in detail below.