초록 ▼

A container molding method for reducing the amount of released acetaldehyde. The method comprises a primary blow molding step of stretch-blow-molding a preform into a primary blow-molded article; an acetaldehyde reducing step of reducing the amount of acetaldehyde released from the primary blow-mold

A container molding method for reducing the amount of released acetaldehyde. The method comprises a primary blow molding step of stretch-blow-molding a preform into a primary blow-molded article; an acetaldehyde reducing step of reducing the amount of acetaldehyde released from the primary blow-molded article; and a final blow molding step of stretch-blow-molding the primary blow-molded article having a reduced amount of acetaldehyde into a final container. The primary blow molding step molds the primary blow-molded article which is larger in size than the final container and which has an average wall-thickness of a stretched barrel portion equal to or less than 0.3 mm, that is smaller than the average wall-thickness of a barrel portion of the final container. The acetaldehyde reducing step heats the thin-walled barrel portion of the primary blow-molded article at a high temperature for a relatively short time. As a result, the final container having a reduced amount of acetaldehyde released from the inner wall of the final container will be molded.

대표청구항 ▼

1. A container molding method for molding a non-heat resistant final container for filling with liquids at 65.degree. C. or less, the method comprising:a primary blow molding step of stretch-blow-molding a preform made of polyester resin into a primary blow-molded article in a primary mold; a step o

1. A container molding method for molding a non-heat resistant final container for filling with liquids at 65.degree. C. or less, the method comprising:a primary blow molding step of stretch-blow-molding a preform made of polyester resin into a primary blow-molded article in a primary mold; a step of heating said primary blow-molded article for reducing an amount of acetaldehyde released from said primary blow-molded article in a heated mold having a mold wall, said primary blow-molded article being in contact with the mold wall during heating; and a final blow molding step of stretch-blow-molding said primary blow-molded article having a reduced amount of acetaldehyde, relative to a primary blow-molded article which is not heated, into a final container; wherein said primary blow molding step molds said primary blow-molded article which is larger in size than said final container and which has an average wall-thickness of a barrel equal to or less than 0.3 mm, and an average wall thickness of the primary blow-molded article is smaller than the average wall-thickness of a barrel of said final container, wherein the amount of acetaldehyde released from an inner wall of said final container is reduced relative to a final container prepared by the same method without said step of heating.