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Plastic containers with folded-over internal layers and methods for making same

  • US 4,751,035 A
  • Filed: 06/10/1985
  • Issued: 06/14/1988
  • Est. Priority Date: 04/13/1983
  • Status: Expired due to Term
First Claim
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1. A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream to form an article in the cavity having a folded over internal layer,comprising during the injection cycle,establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers,positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline,interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, andmoving the location of said third layer to a second location which is substantially coincident with said fast flow streamline thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.

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