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Bottle blank structure beneficial to stretch blow molding

A technology of stretch blow molding and preform, which is applied in the field of preform structure that is conducive to stretch blow molding. It can solve the problems of premature cooling of materials, cracking of the bottom, and excessive thickness of the center point, so as to avoid serious accumulation of material at the bottom of the bottle. , Avoid too thick, reduce the effect of contact area

Pending Publication Date: 2021-08-24
GUANG DONG XING LIAN PRECISE MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before pre-blowing, the stretching rod will stretch the preform. There is a part of the bottom of the preform that wraps the stretching rod. This part is not easy to be stretched during the blow molding process. When the bottom of the preform reaches the bottom of the mold and touches the mold At the same time, the bottom material of the preform is easy to cool prematurely, which makes it more difficult to stretch the bottom of the preform that has not been fully stretched
All of the above reasons will lead to insufficient stretching of the material at the bottom of the preform, and the bottle formed by stretch blow molding is prone to problems such as excessive material accumulation at the bottom, too thick center point, and easy cracking at the bottom due to stress.

Method used

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  • Bottle blank structure beneficial to stretch blow molding
  • Bottle blank structure beneficial to stretch blow molding
  • Bottle blank structure beneficial to stretch blow molding

Examples

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Effect test

Embodiment

[0028] like Figure 1 to Figure 7 As shown, this embodiment discloses a preform structure that is beneficial to stretch blow molding, including an integrally injection-molded preform, and the preform includes a bottle mouth (1), a bottle neck (2), and a preform ( 3) and the bottom of the blank (4), the axial length of the neck (2) is preferably 5-6mm. Since the bottle blank is used for bottle blow molding, the neck (2) is used as the pinch when blowing the bottle. For standard thickness As far as the wall thickness of the bottleneck (2) is about 4-4.5mm, if the axial length of the bottleneck (2) is less than 5mm, it is easy to cause the problem of pinching the preform, if the axial length of the bottleneck (2) is greater than 6mm , because the bottleneck (2) does not participate in stretching during bottle blowing, it will cause too much material waste, and at the same time, the bottleneck transition part (31) that is blown out is prone to material accumulation, which affects ...

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PUM

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Abstract

A bottle blank structure beneficial to stretch blow molding comprises a bottle blank which is integrally formed through injection molding, and the bottle blank comprises a bottle opening, a bottle neck, a blank body and a blank bottom, all of which are sequentially connected. The blank bottom is arranged to be an upper bottom and a lower bottom which are connected, the bottommost end of the lower bottom is lower than a convergent point formed by extension lines of a generatrix curve section I of the upper bottom, so that the lower bottom protruding downwards is formed by the blank bottom on the basis that the upper bottom is formed, the lower bottom serves as a pre-stretching structure of the blank bottom, so that the blank bottom is fully unfolded in the stretch blow molding process, serious material accumulation of the bottle bottom is avoided, more materials are distributed to the remaining parts of the bottom of the bottle blank, and therefore when the bottle blank is designed, the wall thickness of the blank bottom can be designed to be smaller, and the purpose of light weight is achieved.

Description

technical field [0001] The invention relates to the technical field of bottle preform structure, in particular to a bottle preform structure beneficial to stretch blow molding. Background technique [0002] With the improvement of living standards, containers made of glass, ceramics, metals, etc. that were commonly used in the past are gradually being replaced by plastic containers. Compared with containers made of glass, ceramics, and metals, plastic containers are light in weight, not easy to break The advantage of low transportation costs. [0003] Among beverage packaging containers, PET bottles are the most common, and PET bottles have been widely used in various fields of life, such as food, chemical industry, pharmaceuticals, etc., so the demand for PET bottles is very large. According to statistics, the consumption of PET bottles in China in 2018 has exceeded 10 million tons, and the demand is gradually increasing. Therefore, the lightweight of PET bottles is an imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C49/06B29C49/08B29C49/42B29C49/48
CPCB29C49/06B29C49/08B29C49/4268B29C49/48B29C2049/023
Inventor 谢国基姜晓平董书生陈境钰卢佳
Owner GUANG DONG XING LIAN PRECISE MACHINERY
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