Apparatus for making multilayered blow molded articles
AssigneeConsupak, Inc.
InventorJohn Jerome Farrell
Life of this patent
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Abstract
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.
Claims20
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.
An apparatus for making multi-layered hollow articles comprising, a rotatable turntable indexing at a plurality of stations, core rods supportably mounted on said turntable for movement therewith and being opposed to said stations in indexing, a first injection molding station operative for injection molding a first parison on a core rod, a second injection molding station comprising vacuum means operable for stretching the first parison radially and axially of the core rod so as to provide a cavity between the core rod and first parison and means operative for injection molding a second parison on said core rod and into contact with the inside surface of said first parison to form a layered parison, a blow molding station operative to blow mold the layered parison to form a hollow article, and a stripping station operative for removing the hollow article from the core rod.
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 first parison and into which said core rod extends with said parison thereon, means operable to stretch the first parison radially and axially from the core rod, and vacuum means communicating through said mold operative to hold the outside of said first parison into contact with said mold thereby providing a cavity between the core rod and the inside of said first parison, and means operative to form a second parison in said cavity between the core rod and inside of the 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.
Dependencies are inferred from the claim text.