Plastic molded articles having resin fibers dispersed therein
First Claim
1. A plastic molded article formed by expansion molding of a plastic raw material uniformly mixed with a blowing material, wherein said plastic molded article is formed by a two-stage expansion molding process comprising the steps of:
- first-stage expansion molding of the uniformly mixed raw and blowing materials to form a core;
a second-stage expansion molding of a mixture of resin fibers dispersed randomly in said plastic raw material to produce an outer layer around said core such that outer layer is fusion bonded and integrated into one piece with a boundary region of said core, thereby forming a second-stage molded product.
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Accused Products
Abstract
A method of forming a plastic molded article includes expansion molding of a plastic raw material mixed with a blowing material. In a first step, a first-stage expansion molding is used to form a core. This is followed by a second step in which a second-stage expansion molding is employed to produce an outer layer around the previously-formed core, in such a manner that the outer layer is fusion bonded and integrated with a boundary region of the core, thereby forming a second-stage molded product. At least the outer layer contains randomly distributed resin fibers.
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Citations
19 Claims
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1. A plastic molded article formed by expansion molding of a plastic raw material uniformly mixed with a blowing material, wherein said plastic molded article is formed by a two-stage expansion molding process comprising the steps of:
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first-stage expansion molding of the uniformly mixed raw and blowing materials to form a core; a second-stage expansion molding of a mixture of resin fibers dispersed randomly in said plastic raw material to produce an outer layer around said core such that outer layer is fusion bonded and integrated into one piece with a boundary region of said core, thereby forming a second-stage molded product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A plastic molded article formed by expansion molding of a plastic raw material mixed uniformly with a blowing material, wherein said plastic molded article has resin fibers randomly pre-mixed and dispersed therein, before conducting said expansion molding, to thereby cause said resin fibers to be uniformly distributed throughout said plastic molded article when said expansion molding is completed,
wherein said plastic raw material is prepared by adding to a base comprising an ethylene-vinyl acetate copolymer resin an impact modifier comprising one of a highly-adhesive polyolefin resin and an ionomer resin as an impact modifier.
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18. A plastic molded article formed by expansion molding of a plastic raw material mixed uniformly with a blowing material, wherein said plastic molded article has resin fibers randomly pre-mixed and dispersed therein, before conducting said expansion molding, to thereby cause said resin fibers to be uniformly distributed throughout said plastic molded article when said expansion molding is completed,
wherein said plastic molded article has a spherical form for use as any one of a ball for hardball baseball, a ball for softball, and a ball for golf.
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19. A plastic molded article formed by expansion molding of a plastic raw material mixed uniformly with a blowing material, wherein said plastic molded article has resin fibers randomly pre-mixed and dispersed therein, before conducting said expansion molding, to thereby cause said resin fibers to be uniformly distributed throughout said plastic molded article when said expansion molding is completed,
wherein said plastic raw material is prepared by adding to a base comprising an ethylene-vinyl acetate copolymer resin an impact modifier comprising one of a highly-adhesive polyolefin resin and an ionomer resin as an impact modifier, and wherein said plastic molded article has a spherical form for use as any one of a ball for hardball baseball, a ball for softball, and a ball for golf.
Specification