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Process for producing injection-molded article

A technology of injection molding and manufacturing method, which is applied in the field of manufacturing injection molding products, can solve the problems that the surface crystallization of the molded products does not progress, the surface hardness does not increase, and the ejection of the mold is difficult, so as to reduce the amount of flash generated. Effect

Inactive Publication Date: 2012-05-30
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when molding is performed under the condition of low mold temperature as described above, since the crystallization of the surface of the molded product does not progress, the surface hardness does not increase, and the ejection from the mold becomes difficult. , Therefore, problems such as surface roughness, dimensional changes, and warpage caused by the ambient temperature used after molding also occur

Method used

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  • Process for producing injection-molded article
  • Process for producing injection-molded article
  • Process for producing injection-molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Using a PAS resin composition as a molding material, spray the heat-insulating layer forming material on the cavity surface of a flat plate molding mold with a width of 40 mm x a length of 40 mm x a thickness of 1 mm, calcinate at 250°C for 1 hour, and then grind the polyimide The amine surface was adjusted to the thickness of the insulation layer in Table 1, and then molded under the conditions of the mold temperature shown in Table 1 to obtain injection molded products. In addition, the conditions other than the molding conditions shown in a table|surface are as follows.

[0077] [Molding conditions]

[0078] Screw speed: 100rpm

[0079] Injection speed: 100mm / sec

Embodiment 2

[0081] An injection-molded article was produced on the same conditions as in Example 1 except that the condition of the mold temperature was changed from 40°C to 80°C.

Embodiment 3

[0083] An injection-molded article was produced on the same conditions as in Example 1 except that the condition of the mold temperature was changed from 40°C to 100°C.

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Abstract

A process for producing an injection-molded article is provided with which it is possible to reduce the amount of burrs generating during the production and to obtain a molded article having high crystallinity. A mold having a heat-insulating layer formed on the inner surface thereof is used for injection-molding a polyarylene sulfide resin composition, and the injection molding is conducted at a mold temperature of 100 C or lower. It is preferable that the heat-insulating layer have a coefficient of thermal conductivity of 5 W / mK or lower. Preferred examples of the heat-insulating layer include a heat-insulating layer comprising a polyimide resin.

Description

technical field [0001] The present invention relates to a method for producing an injection-molded article obtained by injection-molding a polyarylene sulfide-based resin composition. Background technique [0002] Polyarylene sulfide (hereinafter referred to as PAS) resin represented by polyphenylene sulfide (hereinafter referred to as PPS) resin has high heat resistance, mechanical properties, chemical resistance, dimensional stability, and flame retardancy. Therefore, PAS resins are widely used in electrical and electronic equipment component materials, automotive equipment component materials, chemical equipment component materials, etc., especially in applications where the operating environment temperature is high. [0003] However, the PAS resin tends to form a partially uneven crystal structure due to its slow crystallization rate and high glass transition temperature. Therefore, unevenness in appearance and structure tends to occur on the surface of the molded artic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/26B29C45/78
CPCB29C45/0025B29K2879/08B29C45/37B29C33/3828B29C2033/023B29K2995/0013B29C45/26B29C45/78
Inventor 高岛正人蔡汉龙宫下贵之
Owner POLYPLASTICS CO LTD