Blow molding method and blow molded product

A technology of blow molding parisons and products, which is applied in the field of products, and can solve the problems of complex mold structure, poor rigidity and heat resistance, and low impact resistance

Inactive Publication Date: 2001-10-03
PRIME POLYMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the content of the inorganic filler in the composition is low, the rigidity and heat resistance of the molded article of the composition are poor; but when the content is high, the impact resistance of the molded article is low and its weight increases
Therefore, there is a limit to reducing the weight of molded articles of the composition
In addition, when the composition is molded into a hollow molded product by injection molding, the mold must have a core, but this complicates the structure of the mold.

Method used

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  • Blow molding method and blow molded product
  • Blow molding method and blow molded product
  • Blow molding method and blow molded product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A molding resin material is prepared. This is a pellet mixture consisting of 60 wt% fiber reinforced thermoplastic resin pellets (this is glass fiber reinforced polypropylene resin pellets containing 3 wt% maleic anhydride modified polypropylene and glass fibers (diameter: 13 μm ) are arranged parallel to each other, the glass fiber content in the pellets is 70wt%, the glass fiber length is 16mm) and the melt index (MI, measured at 230°C under a load of 2.16kg according to JIS K7210) of 40wt% is 30g / 10min Composed of polypropylene resin pellets. To 100 parts of the pellet mixture were added 0.2 parts by weight of antioxidants Irganox 1076 from Ciba Specialty Chemicals and 0.2 parts by weight of antioxidants Irgafos 168 from Ciba Specialty Chemicals.

[0068] The molding equipment used here is equipped with a blow molding machine with a 2,000cm 3 Placo's DAC50 for hexagonal bottle molds.

[0069] The molding material was melted and kneaded at 240° C. (screw compressio...

Embodiment 2

[0083] A blow-molded article was produced in the same manner as in Example 1, but using a mold (outer diameter: 40 mm) for producing a hose for an internal combustion engine intake system. The wall thickness of the hose is 3mm.

Embodiment 3

[0085] A molding resin material is prepared. This is a pellet mixture consisting of 60 wt% fiber reinforced thermoplastic resin pellets (this is glass fiber reinforced polypropylene resin pellets containing 3 wt% maleic anhydride modified polypropylene and glass fibers (diameter: 13 μm ) are arranged parallel to each other, the glass fiber content in the pellets is 70wt%, the glass fiber length is 16mm) and the melt index (MI, measured at 230°C under a load of 2.16kg according to JIS K7210) of 40wt% is 30g / 10min Composed of polypropylene resin pellets. To 100 parts of the pellet mixture were added 0.2 parts by weight of the antioxidant Irganox 1076 from Ciba Specialty Chemicals, 0.2 parts by weight of the antioxidant Irgafos 168 from Ciba Specialty Chemicals, and 0.4 parts by weight of the blowing agent azodicarbonamide (ADCA).

[0086] The molding equipment used here is equipped with a blow molding machine with a 2,000cm 3 Placo's DAC50 for hexagonal bottle molds.

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Abstract

A lightweight blow molded product which is high in strength per weight, rigidity and heat resistance, is excellent in sound-absorbing, heat-insulating and sound-insulating features, can be produced at low costs, and is useful for intake-system parts of an internal combustion engine; and a production method therefor. A blow molding method for a fiber-containing thermoplastic resin, wherein a parison formed of a thermoplastic resin having an inorganic fiber-containing, melt-expansibility is held between opposing molds, a gas is blown in for shaping, and then, as required, a gas pressure is reduced to expand the shaped product; and a blow molded product consisting of thermoplastic resin containing 15 to 70 wt.% of inorganic fibers having an average fiber length of 1 to 20 mm, and having a porosity of 10 to 90%.

Description

technical field [0001] The present invention relates to a blow molding method and to blow molded articles, more precisely to articles which are lightweight but have good strength and good heat resistance and are therefore suitable for use in components of the feed system of a motor vehicle internal combustion engine and the like. Background technique [0002] Synthetic resins have many applications in various molded articles in various fields. Especially the blow molding method is mostly used to produce various containers because of its low blow molding pressure and its cheap molds. In the field of automobiles these days, the most important thing is to reduce fuel consumption to save energy and solve environmental problems. In order to meet this requirement, light-weight automobiles are highly demanded. In order to reduce the weight of an automobile body, many of its parts are made of resin rather than metal, and the conversion from metal to resin has been quite remarkable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C49/04B29C49/20
CPCB29L2031/30B29C49/041B29K2705/00B29K2709/08B29K2309/08B29K2105/12B29C49/04B29C49/20
Inventor 小原智之
Owner PRIME POLYMER CO LTD
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