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Integrated molded body

A molding and injection molding technology, which is applied in chemical instruments and methods, synthetic resin layered products, and devices for human tubular structures, etc., can solve the problems of reduced strength and rigidity of weld lines, and reduced strength and rigidity of injection-molded bodies. achieve enhanced effect

Active Publication Date: 2020-03-17
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the strength and rigidity of the weld line are reduced, the strength and rigidity of the injection molded product are also greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0323]The reinforcing base material 1 was cut into 150mm×30mm. The cut reinforcing base material was inserted into the central part of an injection molding mold having a cavity of 150 mm in length x 150 mm in width x 1 mm in thickness, where a weld line was expected to occur, so that the reinforcement base material was integrated with the injection molded body and covered and along the Weld line. Injection resin 1 was injection molded at a cylinder temperature of 260°C and a mold temperature of 80°C to produce an integrated molded body in which the reinforcing base material and the injection molded body were integrated. The reinforcing base material 1 was integrated with the injection molded body within a distance of 30 mm in the width direction of the weld line of the injection molded body. In the obtained integrated molded body, twisting of the reinforcing base material was not observed, and a molded body with good quality was successfully produced. In addition, the mechan...

Embodiment 2

[0325] Except for the point of using the reinforcement base material 2 instead of the reinforcement base material 1, it carried out similarly to Example 1, and produced the integrated molded body. The evaluation results of the integral molded body are shown in Table 3-1. Since the thickness of the reinforcing base material 2 is small, the flow of the injection resin is not hindered, and no torsion was observed in the reinforcing base material of the obtained integrated molded body, and a high-quality molded body was successfully produced. In addition, the mechanical properties of the weld line portion of the integrated molded body are excellent.

Embodiment 3

[0327] Except for using the reinforcement base material 3 instead of the reinforcement base material 1, it carried out similarly to Example 1, and produced the integrated molded body. The evaluation results of the integral molded body are shown in Table 3-1. Since the elastic modulus of the reinforcing base material 3 is low, the elastic modulus of the weld line portion of the integrated molded product is low, but no torsion of the reinforcing base material was observed in the obtained integrated molded product, and a high-quality molding was successfully produced. body.

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Abstract

The purpose of the invention is to solve the problem of decreased strength / rigidity in the weld line of an injection molded body, and enable free design, such as the injection molding of thin-walled products or products having complicated shapes. Provided is an integrated molded body in which a reinforcing substrate having a discontinuous fiber and a resin is integrated with an injection molded body having a discontinuous fiber and a resin, wherein the reinforcing substrate is integrated with the injection molded body so as to cover a portion or all of the weld line of the injection molded body, and the ratio of the thickness Ta of the reinforcing substrate to the thickness T of a weld line portion of the integrated molded body satisfies the following relation: Ta / T<=((Ebw-square(Ea.Ebw)) / (Ebw-Ea)), when Ea = Ebw, Ta / T<=0.5 when Ea=Ebw, where Ta is the thickness of the reinforcing substrate, T is the thickness of the weld line of the integrated molded body, Ea is the flexural modulus (width direction of the weld line) of the reinforcing substrate, and Ebw is the flexural modulus (width direction of the weld line) of the weld line portion of the injected molded body.

Description

technical field [0001] The present invention relates to an integrated molded body in which a reinforcing base material and an injection molded body are integrated. Background technique [0002] Injection molding is a molding method with excellent moldability, productivity, and economy, and is frequently used in electrical and electronic equipment such as automotive equipment parts, personal computers, OA equipment, AV equipment, mobile phones, landline telephones, facsimile machines, home appliances, and toys. The production of parts and shells. In recent years, with the popularization of mobile electronic devices represented by notebook computers, mobile phones, and mobile information terminals, thinner walls, more complex shapes, and higher strength and higher rigidity are required for injection molded products. [0003] However, the injection molded product has a problem that the strength and rigidity at the weld line are lowered. The weld line indicates a part where th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/14B29C70/12B32B5/28
CPCB29C45/14B29C70/12B32B5/28B29C70/887B29C70/42B29C45/00B29C45/0025B29C45/14631B32B27/08C08J2363/00C08J5/24Y10T428/249933Y10T428/24994B32B2262/10B32B2307/546B32B2307/7376
Inventor 铃木贵文仙头裕一朗今井直吉滨口美都繁本间雅登
Owner TORAY IND INC