PET (polyethylene) sheet three-dimensional molding process and counter pressure thermal molding mould

A three-dimensional forming and thermoforming technology, which is applied in the field of three-dimensional forming of surface decorative sheets, can solve the problems of large springback and poor forming of PET sheets, so as to release internal stress, solve poor forming, and reduce springback. Effect

Inactive Publication Date: 2012-02-15
TIANJIN ZHONGHUAN HI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional PC molding process to process PET sheets has the problems of poor molding and large rebound. Therefore, combined with the characteristics of PET sheets, the traditional sheet molding process and the high-pressure heat used in the molding process are improved. Molding is an urgent issue

Method used

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  • PET (polyethylene) sheet three-dimensional molding process and counter pressure thermal molding mould
  • PET (polyethylene) sheet three-dimensional molding process and counter pressure thermal molding mould
  • PET (polyethylene) sheet three-dimensional molding process and counter pressure thermal molding mould

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing. The present invention adopts HA-150P thermoforming machine tool, adopts the PET sheet material of 0.1mm thickness, takes making KIA automobile electronic key as an example, and its specific process steps are as follows:

[0022] Step 1: Install the upper mold and the lower mold of the counter-pressure thermoforming mold into the upper and lower tables of the thermoforming machine;

[0023] Step 2: heat up the counter-pressure thermoforming mold, the upper mold is raised to 90°C, and the lower mold is raised to 80°C;

[0024] Step 3: Put the PET sheet to be formed on the lower mold (positioned by the positioning column);

[0025] Step 4: Heat the PET sheet with the IR infrared heating plate, set the temperature of the IR infrared heating plate to 350°C, and withdraw the IR infrared heating plate after heating for 12 seconds;

[0026] Step 5: Molding the upper and lower molds...

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Abstract

The invention relates to a PET (polyethylene) sheet three-dimensional molding process and a counter pressure thermal molding mould. By improving a molding mould and adjusting thermal molding machine tool parameter, the PET sheet three-dimensional molding processing is realized. The molding mould comprises an upper module and a lower mould; the lower mould comprises a mould core, a pressure plate and a lower formwork; the mould core is fixed on the lower formwork, the pressure plate is in threaded connection with the lower formwork through an unloading bolt on which a spring is sleeved, the pressure plate is provided with a locating pillar, the lower formwork is provided with a guide pillar, the pressure plate is in sliding fit with the guide pillar and the mould core, the upper mould and the lower mould are in mould assembling or de-mould fit. By heating and assembling the PET sheet, and adopting a step of continuously and repeatedly pressurizing and maintaining pressure, the internal stress of the PET sheet is released to maximally reduce the resilience, thereby solving the problems that the PET sheet is hard to mold and great in resilience; the PET sheet with strong resilience can achieve a stable three-dimensional effect and meets various demands of clients.

Description

technical field [0001] The invention relates to a three-dimensional forming process of a surface decoration sheet, in particular to a three-dimensional forming process of a PET sheet and a counter-pressure thermoforming mold. Background technique [0002] In the information age with the rapid development of science and technology, surface decorations have shown the characteristics of diversification in shape, diversification of printing patterns and personalization. On this basis, the focus of consumers and the market has turned to higher requirements for its quality. At present, consumers not only need beautiful shapes, diversified patterns and personalization for surface decoration parts, but also require them to be durable, and the surface should have stronger scratch resistance and higher hardness. The sheet used in the traditional IML (In-Mold Lable Injection Molding) process is PC sheet. Although PC sheet has the advantages of good printing adhesion and good three-...

Claims

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Application Information

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IPC IPC(8): B29C51/08B29C51/30B29L7/00
Inventor 曾晓东王慧李颀刘静艳刘利鲍一兵
Owner TIANJIN ZHONGHUAN HI TECH
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