Plastic injection-pressing compound forming process and its mould

A composite molding and injection pressure technology, which is applied to the plastic injection-pressing composite molding process and the transformation of its molds, can solve the problems of difficulty in cleaning the feeding chamber, a large number of pouring systems, and troublesome production operations, achieving a good production environment, improving Production environment, easy assembly effect

Inactive Publication Date: 2005-03-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this process can produce plastic parts with complex shapes and large sizes, granular or powdery plastic raw materials must be added quantitatively at the beginning of the molding cycle for each product, resulti

Method used

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  • Plastic injection-pressing compound forming process and its mould
  • Plastic injection-pressing compound forming process and its mould

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Embodiment

[0023] The plastic injection-compression composite molding process of the present invention includes the following steps:

[0024] (1) Plastic raw materials are heated and plasticized in the barrel of the injection machine;

[0025] (2) Under the action of the two-stage mold-closing and mold-opening mechanism, the mold is first-stage closed to form a closed cavity;

[0026] (3) Under the action of the injection pressure, the molten plastic is ejected from the nozzle at the front end of the barrel and injected into the closed cavity of the mold through the gating system to achieve quantitative filling of the cavity;

[0027] (4) The cavity is heated and insulated to keep the plastic melt at the molding temperature. At the same time, the injection pressure maintains the pressure in the cavity to reach the molding pressure. The mold is closed in two stages to further reduce the distance between the convex mold and the concave mold surface. Realize compression molding;

[0028] (5) Th...

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Abstract

The compound plastic injection-pressing formation process includes heating to plasticize, the first mold clamping, injecting molten plastic into the closed mold cavity, heating and maintaining, the second mold clamping, cooling to set inside the mold cavity and demolding. The mold includes female mold, male mold, mold clamping guide mechanism and two stages of mold closing and opening mechanism. The present invention has improved production environment and high production efficiency, can produce precise large plastic part with complicated shape, is favorable to the production with plastic with poor flowability and great viscosity.

Description

1. Technical field: [0001] The invention is a plastic injection-compression composite molding process and its mold, and belongs to a plastic injection-compression composite molding process and its mold transformation technology. 2. Background technology: [0002] At present, plastic molding methods mainly include plastic injection molding, plastic compression molding and plastic die-casting. Among them, plastic injection molding is the heating and plasticization of plastic in the barrel of the injection molding machine. Under the action of injection pressure, the plastic is melted. It is sprayed from the nozzle at the front end of the barrel, and injected into the closed cavity of the mold through the pouring system, and then cooled and shaped. Finally, open the cavity, demold and take out the product. This kind of molding process is often used in the production of plastic parts with more complex shapes. However, due to the limitation of the maximum melt flow, this process cannot...

Claims

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Application Information

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IPC IPC(8): B29C43/32B29C43/36B29C45/26B29C45/64B29C45/73B29C69/02
Inventor 李江平
Owner GUANGDONG UNIV OF TECH
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