Claims
- 1. A method of making a container comprising the steps of coextruding a tubular preform comprising a first dimensionally stable outer portion and a second inner deformable portion having free ends, said first and second portions being composed of incompatible thermoplastic materials, molding an end of the preform into a receptacle bottom, wherein said molding step includes the formation of a weld seam in the first outer portion, and wherein the weld seam clamps the free end of the second inner deformable portion to close the end of the second portion to form an inner bag, and molding an upper part of the preform into a container shoulder, and then subsequent to the molding step, applying negative pressure to the inner bag to partially collapse the same and to form openings between unwelded seams in the shoulder.
- 2. The method of claim 1 wherein a neck is molded in the container in the molding step.
- 3. The method of claim 1 wherein said weld seam is molded in the form of a web projecting from the bottom.
- 4. The method of claim 3 wherein said web is substantially kite-shaped.
Priority Claims (2)
Number |
Date |
Country |
Kind |
41 31 035.7 |
Sep 1991 |
DEX |
|
41 39 555.7 |
Nov 1991 |
DEX |
|
Parent Case Info
This is a divisional of application Ser. No. 07/934,707, filed on Aug. 24, 1992, now U.S. Pat. No. 5,316,135.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
182094 |
May 1986 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
934707 |
Aug 1992 |
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