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US 4,512,832 AGranted
Method for manufacturing a tube package
AssigneeTetra Pak Developpement SA
InventorHans Rausing
Life of this patent
Estimating the term…
Abstract
A tube package of plastic material which includes a tubular shell part together with end closures front and back. The shell part is constituted of a cylinder of molecular-oriented plastic material, and its front end closure of a curved shrunk portion of the extension of the shell part. The rear closure of the shell part is constituted of a transversely sealed portion of the shell part.
Claims6
A method for manufacturing tubular packing containers, comprising:
- cutting a web of an oriented plastic material into shorter lengths substantially corresponding to a desired circumference of the tubular packing containers;
- folding its shorter length of web into a tube by overlapping opposed end portions of the web, said opposing end portions having opposing surfaces;
- extruding a string of melted plastic material onto at least one of said opposing surfaces of the overlapping opposed edge portions of the web;
- pressing said overlapping edge portions of the web to each other aginst said string so as to prevent release of orientation stresses of the plastic material thereby avoiding shrinkage of the overlapping opposed edge portions of the web;
- placing each tube of web material on a mandrel;
- heating a portion of each tube thereby shrinking that portion of the tube over an underlying profiled portion of the mandrel;
- and
- removing the tube from the mandrel.
5 more elements
A method for manufacturing tubular packing containers, comprising:
- cutting a web of oriented plastic material into shorter lengths substantially corresponding to a desired circumference of the tubular packing containers;
- folding each shorter length of web into a tube by overlapping opposed longitudinal edge portions of the web;
- sealing said overlapping edge portions of the web to each other;
- placing each tube of web material on a pair of mandrels having abutting profiled end portions;
- heating a central portion of each tube thereby shrinking that portion of the tube over said abutting profiled end portions;
- removing the tube from said pair of mandrels by separating said two mandrels from each other;
- dividing said tube into two packing containers by transversely cutting said tube along said shrunk central portion;
- and
- securing tube closing means over said shrunk portion of each tube.
6 more elements
Dependencies are inferred from the claim text.