An injection molding process for preventing injection overflow

An injection molding process and overflow technology, which is applied in the field of injection molding process to prevent injection overflow, can solve the problems of the original properties of a single pellet, the inability to effectively adjust the melting speed and quantity, and single production materials, so as to improve the product Appearance, stabilize product appearance, ensure continuous effect

Active Publication Date: 2022-04-19
永新股份(黄山)包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Moreover, the existing process controls the production of a single material, and the original properties of a single pellet are maintained after melt injection molding. Under stable process conditions, the speed and quantity of melting cannot be effectively adjusted, that is, the switch cannot be completed within a unit time. The extension of the original property is like the inertia extension after braking, so it is necessary to provide an injection molding process that prevents injection overflow to solve the above problems

Method used

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  • An injection molding process for preventing injection overflow
  • An injection molding process for preventing injection overflow
  • An injection molding process for preventing injection overflow

Examples

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Effect test

Embodiment 1

[0022] An injection molding process for preventing injection overflow, comprising the following steps:

[0023] (1) Preparation of modified polyethylene: 900 parts of low-density polyethylene, 99 parts of high-density polyethylene and 1 part of slippery agent were mixed and stirred for 10 minutes to obtain uniform blend pellets;

[0024] (2) Injection molding: Add the blend pellets in step (1) to the hopper of the injection molding machine, and the blend pellets are melted by the heating screw in the heating barrel to form a fluid with uniform properties, and inject it with a gate mold , holding pressure, cooling molding, demoulding, to obtain the product.

Embodiment 2

[0026] An injection molding process for preventing injection overflow, comprising the following steps:

[0027] (1) Preparation of modified polyethylene: 950 parts of low-density polyethylene, 49 parts of high-density polyethylene and 1 part of slippery agent were mixed, stirred for 10 minutes, and uniform blend pellets were obtained;

[0028] (2) Injection molding: Add the blend pellets in step (1) to the hopper of the injection molding machine, and the blend pellets are melted by the heating screw in the heating barrel to form a fluid with uniform properties, and inject it with a gate mold , holding pressure, cooling molding, demoulding, to obtain the product.

Embodiment 3

[0030] An injection molding process for preventing injection overflow, comprising the following steps:

[0031] (1) Preparation of modified polyethylene: 970 parts of low-density polyethylene, 29 parts of high-density polyethylene and 1 part of slip agent were mixed, stirred for 10 minutes, and uniform blend pellets were obtained;

[0032] (2) Injection molding: Add the blend pellets in step (1) to the hopper of the injection molding machine, and the blend pellets are melted by the heating screw in the heating barrel to form a fluid with uniform properties, and inject it with a gate mold , holding pressure, cooling molding, demoulding, to obtain the product.

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Abstract

The invention relates to an injection molding process for preventing injection overflow, and relates to the field of injection molding technology. Modified polyethylene is prepared by mixing low-density polyethylene, high-density polyethylene and a smoothing agent according to the weight ratio, and stirring evenly to obtain Blend pellets; injection molding: Add the above-mentioned blend pellets to the hopper of the injection molding machine, and the blend pellets are melted by the heating screw in the heating barrel to form a fluid with uniform properties, and inject it with a gate mold , holding pressure, cooling molding, demoulding, to obtain the product. The present invention studies the properties of different melting values ​​of the pellets and uses them together to effectively adjust the melting speed and quantity, overcomes the elongation phenomenon of the pellets after melting, and solves the problem of concentric circle residues on the appearance of the product.

Description

technical field [0001] The invention relates to the field of injection molding technology, in particular to an injection molding technology for preventing injection overflow. Background technique [0002] Injection molding production control is used to the use of a single pellet to simplify the production process control and pursue the stability and uniqueness of the output product quality. However, due to the application requirements of the product and the constraints of the application environment, the production of products using a single pellet cannot meet market demand and molding appearance requirements. [0003] Take the production of hot runner needle valve gate products as an example: In injection molding production, under the action of the electronic valve to control the air pressure, the needle valve thimble will repeatedly expand and contract the mold cavity, or the molten material will overflow due to the movement gap of the thimble. Or there is a gap in the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/78C08L23/06C08K5/20B29K23/00
CPCB29C45/0001B29C45/78C08L23/06B29K2023/0608C08L2205/025C08L2207/066C08L2207/062C08K5/20
Inventor 余爱国汪海龙程俊义姚宏奎
Owner 永新股份(黄山)包装有限公司
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