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Gas-flow opposite porous external gas assisted injection mold

A technology of external gas and airflow hedging, applied in the field of polymer injection molds, can solve problems such as difficult to achieve air pressure balance, polymer melt gas marks, large flow rate, etc., to ensure smoothness and precision, and eliminate pressure gradient difference Effect

Pending Publication Date: 2019-07-12
SHANGRAO NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this rough air intake method will produce large flow rate, high pressure and obvious pressure gradient difference, it is difficult to achieve air pressure balance, and it is easy to cause gas marks in the polymer melt

Method used

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  • Gas-flow opposite porous external gas assisted injection mold
  • Gas-flow opposite porous external gas assisted injection mold
  • Gas-flow opposite porous external gas assisted injection mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: A kind of air-flow counterpoise porous external air-assisted injection mold, see Figure 1 to Figure 6 .

[0025] It includes a mold body with a cavity inside, a perforated plate is arranged inside the mold body, and a number of pores 10 arranged in a matrix are opened on the perforated plate, and the diameter of the pores is 1mm-2.5mm. It is an injection cavity, the top of the mold body above the perforated plate is provided with an air inlet, and the bottom of the mold body is provided with a glue injection hole communicating with the injection cavity.

[0026] Specifically, the mold body includes an air intake module 1 and a glue injection module 2, the glue injection module 2 is provided with a groove 7, the groove 7 forms the injection molding cavity, and the glue injection hole 6 is located at the bottom of the glue injection module 2 , the air intake module 1 is buckled on the injection module 2 and the two are fixedly connected by bolts, and in or...

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Abstract

The invention provides a gas-flow opposite porous external gas assisted injection mold. When reaching the back surface of a polymer product, high-pressure gas presents a large flow rate, high pressureand no pressure gradient, and therefore the smoothness and precision of the back surface of the product are ensured. The injection mold comprises a mold body with a cavity inside, a porous plate is arranged inside the mold body, a plurality of gas holes are distributed in a matrix manner, an injection cavity is formed below the porous plate, gas inlets are formed at the top of the mold body abovethe porous plate, and a glue injection hole communicating with the injection cavity is formed at the bottom of the mold body.

Description

technical field [0001] The invention relates to the technical field of polymer injection molds, in particular to an airflow counterporous porous external air-assisted injection mold. Background technique [0002] Gas-assisted injection molding is a widely used injection molding process. Plastic products on the market are all produced by this process. It is divided into internal gas-assisted injection molding and external gas-assisted injection molding. The former is to inject high-pressure gas into the melt to form a hollow part, and the latter is to inject high-pressure gas into the gap between the melt and the mold wall to form a layer of air cushion. [0003] External gas-assisted injection molding uses high-pressure gas to compensate the shrinkage characteristics of the polymer on the back of the polymer product, thereby reducing or eliminating defects such as warping and dents on the back of the polymer product. During this process, the injection mold must be sealed wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/34B29C45/17B29C45/77
CPCB29C45/345B29C45/1704B29C45/77B29C2945/76006B29C2945/76257
Inventor 黄益宾章凯庄玲余忠
Owner SHANGRAO NORMAL UNIV