Container manufacturing method and preform
AssigneeYoshino Kogyosho Co., Ltd.
InventorYuichi OKUYAMA
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Abstract
By coating an inner surface of a preform, in which at least an inner surface is made of polyester and which has transparency, with a coating layer, which has elongation capacity and water insolubility, the inner surface of the preform is protected against a pressurized liquid by the coating layer when the pressurized liquid is supplied to the preform, and occurrence of cloudiness on an inner surface of a container after molding is prevented even in a case where a liquid having properties of eroding polyester and causing cloudiness on a polyester surface is used as the pressurized liquid during liquid blow molding.
Claims12
A method of producing a container, comprising:
- a preform molding step of molding a preform in which at least an inner surface is made of polyester and which has transparency;
- a coating step of coating the inner surface of the preform with a coating layer having elongation capacity and water insolubility;
- and
- a liquid blow molding step of molding the preform into the container having a predetermined shape by supplying a pressurized liquid into the preform in which the inner surface is coated with the coating layer.
A preform having transparency and configured to be molded into a container having a predetermined shape by liquid blow molding, wherein
- at least an inner surface of the preform is made of polyester, and the inner surface is coated with a coating layer having elongation capacity and water insolubility.
Dependencies are inferred from the claim text.