Method for production of hollow articles from injection molded preforms using insulated runner system
AssigneeMonsanto Company
InventorWilliam D. Wolf
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Abstract
Hollow articles such as bottles and containers are formed from tubular, elongated, reheated injection molded preforms made of thermoplastic material by a method which comprises injection molding said preforms using a mold distribution system having an insulated runner connecting an inlet sprue with one or more externally heated orifice gate channels.
Claims10
In the method for the production of hollow articles by thermoforming tubular, elongated reheated injection molded preforms made of thermoplastic material the improvement comprising injection molding said preforms using a mold distribution system having an insulated runner with walls approaching the glass transition temperature of the thermoplastic material, said runner connecting an inlet sprue with one or more externally heated orifice gate channels, the thermoplastic material in such channels being above its glass transition temperature.
Dependencies are inferred from the claim text.