초록 ▼

A multilayered hollow article is formed by first injection molding the outer layer parison on a core rod and then forming a clearance between this first parison and the core rod in a second mold, followed by injection molding the inner layer parison through the inside of the core rod to the outside

A multilayered hollow article is formed by first injection molding the outer layer parison on a core rod and then forming a clearance between this first parison and the core rod in a second mold, followed by injection molding the inner layer parison through the inside of the core rod to the outside of the core rod and into intimate contact with the outer layer, and subsequently blow molding the formed two-layered parison in a blow mold to obtain the final configuration. This method and apparatus are particularly suitable to forming multilayered containers wherein the innermost layer is a barrier thermoplastic, such as polyvinylidene chloride, and wherein the dimensional integrity of the innermost layer must be maintained.

대표청구항 ▼

An apparatus for making a multi-layered hollow article comprising, a core rod, means operative to form a first parison on said core rod, a mold having a cavity larger than the formed parison and into which said core rod extends with said parison thereon, vacuum means operable to stretch the first pa

An apparatus for making a multi-layered hollow article comprising, a core rod, means operative to form a first parison on said core rod, a mold having a cavity larger than the formed parison and into which said core rod extends with said parison thereon, vacuum means operable to stretch the first parison radially and axially from the core rod so as to provide a cavity between the core rod and the first parison, and means operative to form a second parison in said cavity between the core rod and first parison so as to form a layered parison, the first parison being the outer layer and the second parison being the inner layer, and means operative to blow mold said layered parison to form the hollow article.