초록 ▼

A hollow blow-molded bottle-shaped container of a biaxially oriented polyethylene terephthalate which advantageously has a crystallized outer peripheral portion at the neck portion except the boundary between the neck portion and the body portion and non-crystallized inner peripheral portion thereat

A hollow blow-molded bottle-shaped container of a biaxially oriented polyethylene terephthalate which advantageously has a crystallized outer peripheral portion at the neck portion except the boundary between the neck portion and the body portion and non-crystallized inner peripheral portion thereat. This bottle-shaped container is molded by a method of molding the same, which method advantageously has the steps of injection-molding a piece or parison formed at the outer peripheral surface of a neck root part forming portion in a downwardly flared tapered shape, and crystallizing by a heat treatment the outer peripheral surface portion of the neck root part forming portion. Thus, the deterioration in the physical properties of the neck and shoulder portions of the bottle-shaped container thus finally blow-molded can be reduced.

대표청구항 ▼

A hollow blow-molded container of polyethylene terephthalate resin, comprising: a crystallized neck portion, a biaxially oriented and uncrystallized body portion, and a shoulder portion between said neck and body portions having an upper portion which is crystallized through substantially its entire

A hollow blow-molded container of polyethylene terephthalate resin, comprising: a crystallized neck portion, a biaxially oriented and uncrystallized body portion, and a shoulder portion between said neck and body portions having an upper portion which is crystallized through substantially its entire thickness and a lower portion which is biaxially oriented by blowing an uncrystallized inner layer of a neck root portion of a preform for said container substantially entirely past a crystallized outer layer of the neck root portion.