Preform, resin-made container, and manufacturing method therefor
AssigneeNissei Asb Machine Co., Ltd.
InventorYoichi Tsuchiya
Life of this patent
Estimating the term…
Abstract
A preform including: an opening portion; a body portion; and a bottom portion, the preform having a two-layer structure in which the body portion and the bottom portion include an inner layer made of a virgin material and an outer layer made of a recycled material, in which a weight ratio of the recycled material to a total weight of the preform is 50% by weight or more, a ratio of a thickness of the outer layer to a thickness of the inner layer in the body portion is 1.5 or more, and a haze of a body portion of a container molded from the preform is 1.8% or less.
Claims14
A manufacturing method for manufacturing a preform, the preform including an opening portion, a body portion, and a bottom portion, and the preform having a two-layer structure in which the body portion and the bottom portion include an inner layer made of a virgin material and an outer layer made of a recycled material, the manufacturing method comprising:
- a first injection molding process of injecting the virgin material or the recycled material into a first mold to injection mold an inner layer material or an outer layer material;
- and
- a second injection molding process of accommodating the inner layer material or the outer layer material molded in the first injection molding process in a second mold, and injecting the recycled material to an outer side of the inner layer material to injection mold an outer layer material or injecting the virgin material to an inner side of the outer layer material to injection mold an inner layer material, and
- a cooling process of accommodating the preform in a cavity mold different from the first mold and the second mold after the second injection molding process and cooling the preform accommodated in the cavity mold such that a haze of a body portion of a container molded from the preform is 1.8% or less,
- wherein the inner layer material and the outer layer material are molded such that a weight ratio of the recycled material to a total weight of the preform is 50% by weight or more and a ratio of a thickness of the outer layer to a thickness of the inner layer in the body portion is 1.5 or more.
A manufacturing method for manufacturing a resin-made container, the manufacturing method comprising:
- an injection molding process of injection molding a preform, the preform including an opening portion, a body portion, and a bottom portion, and the preform having a two-layer structure in which the body portion and the bottom portion include an inner layer made of a virgin material and an outer layer made of a recycled material;
- a temperature adjustment process of adjusting a temperature of the preform;
- and
- a blow molding process of blow molding the preform to mold a resin-made container,
- wherein the injection molding process includes:
- a first injection molding process of injecting the virgin material or the recycled material into a first mold to injection mold an inner layer material or an outer layer material;
- and
- a second injection molding process of accommodating the inner layer material or the outer layer material molded in the first injection molding process in a second mold, and injecting the recycled material to an outer side of the inner layer material to injection mold an outer layer material or injecting the virgin material to an inner side of the outer layer material to injection mold an inner layer material, and
- wherein in the injection molding process, the inner layer material and the outer layer material are molded such that a weight ratio of the recycled material to a total weight of the preform is 50% by weight or more and a ratio of a thickness of the outer layer to a thickness of the inner layer in the body portion is 1.5 or more, and
- wherein the temperature adjustment process comprises accommodating the preform in a cavity mold different from the first mold and the second mold after the injection molding process and before the blow molding process and adjusting the temperature of the preform accommodated in the cavity mold such that a haze of a body portion of the resin-made container molded from the preform is 1.8% or less.
Dependencies are inferred from the claim text.