Process for producing a fiber-reinforced thermoplastic resin molded product and product thereby produced

A technology for thermoplastic resin and molded products, applied in the field of manufacturing fiber-reinforced thermoplastic resin molded products, can solve problems such as poor productivity and economy, and achieve the effects of reducing thermal aging, improving work efficiency, and excellent detachability

Inactive Publication Date: 2004-02-11
FIBER GLASS JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the above-mentioned sheet molding results in poor productivity and economy

Method used

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  • Process for producing a fiber-reinforced thermoplastic resin molded product and product thereby produced
  • Process for producing a fiber-reinforced thermoplastic resin molded product and product thereby produced
  • Process for producing a fiber-reinforced thermoplastic resin molded product and product thereby produced

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] A single glass fiber strand obtained by bundling 600 monofilaments with an average diameter of 13 micrometers was added to acid-modified molten polypropylene (260° C.) with an M1 (melt index) of 40 for melt impregnation, followed by , pultruded from a spinneret hole with an inner diameter of 0.53 mm at a rate of 50 m / min, and cut into a length of 20 mm with a granulator to obtain a fiber-reinforced thermoplastic resin substrate. The substrate had an average diameter of 0.53 mm, an L / D of 37.7, a glass content of 45.5% by volume, and a resin impregnation rate of 100% (the average number of times n=5, where n is the number of measurements).

[0097] The above-mentioned glass content was obtained by heating the obtained fiber-reinforced thermoplastic resin substrate in an electric furnace at 600°C to burn off the resin, and then, the glass content (% by weight) was calculated from the remaining glass weight, and the value was converted into volume %, according to the speci...

Embodiment 2

[0102] A safety shoe toe core as a molded article was produced in the same manner as in Example 1 except that the L / D of the fiber-reinforced thermoplastic resin base material was 56.6 (cut length: 30 mm). The length of the remaining filaments in the molten mass can maintain 100% of the initial length of the filaments in the substrate. The length of the remaining filaments in the toe core of the safety shoes keeps 95% of the initial length of the filaments in the base material.

Embodiment 3

[0104] A safety shoe toe tip core was made in the same manner as in Example 1, except that an average diameter of 0.70 mm, a glass content of 32.2% by volume, and an L / D of 28.6 (cut length: 20 mm) were used Fiber-reinforced thermoplastic resin substrates. The length of the remaining filaments in the molten mass can maintain 100% of the initial length of the filaments in the substrate. The length of the remaining filaments in the toe tip core of the safety shoes keeps 97% of the initial length of the filaments in the base material.

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Abstract

A new process for producing a fiber-reinforced thermoplastic resin molded product with a high mechanical strength and no heat substantial deterioration of the resin, by an efficient heating without applying shear stress to the fiber-reinforced thermoplastic resin base material and a molded product, for example, a tiptoe core for a safety shoe produced by said process are provided. The fiber-reinforced thermoplastic resin base material P1 in a string form or a tape form is scattered and accumulated in a vessel such as tube 11, and a heating gas passed to the accumulated base material to melt heat, and preferably press by a plunger 15, the base material P1, whereby a molten mass P2 is formed, and then the molten mass P2 is dislocated to a mold to be press-mold. Said base material preferably satisfies the following formula: {fraction (1 / 100<=RHO1 / rho0<= 1 / 2 , wherein rho0 means a density where said base material is scattered and accumulated and rho0 means a true density of said base material.

Description

technical field [0001] The present invention relates to a novel method for producing fiber-reinforced thermoplastic resin molded articles suitable for the production of auto parts, electrical equipment, industrial materials, civil engineering materials, daily necessities, and the like. These products all need to have good appearance and high mechanical strength and high rigidity. [0002] The invention also relates to an article such as a toe core for safety shoes made by said new method. technical background [0003] As a method of producing fiber-reinforced thermoplastic resin molded articles, it is known to use a continuous fiber sheet or chopped glass fiber mat (hereinafter referred to as GMT) impregnated with molten thermoplastic resin. In order to adapt to the shape of the target product, after cutting the GMT, perform secondary heating, melting and compression molding. [0004] However, when GMT is molded, the resulting molded article has insufficient mechanical str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A43B23/16A43B23/08B29C43/02B29C43/36B29C43/52B29C70/34B29C70/46B29D35/12B29K105/06
CPCB29C70/46B29D35/12Y10T428/249942Y10T428/2495B29C70/345B29C43/361A43B23/087Y10T428/24995Y10T428/24994B29C70/34
Inventor 水上徹尾崎宪吾富永真彦横尾祐次
Owner FIBER GLASS JAPAN
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