Method for producing a container and container with pressure equalization openings
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United States of America Patent
Stats
-
Aug 21, 2001
Issued Date -
N/A
app pub date -
Feb 23, 2000
filing date -
Aug 30, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The receptacle consists of a stiff outer receptacle and an easily deformable inner bag resting on said outer receptacle, and is produced in a coextrusion-type blow molding process. The outer receptacle contains at least one pressure compensating opening through which air enters between the outer receptacle and the inner bag whenever receptacle contents is discharged, for instance, by means of a pump. The at least one pressure compensating opening is formed by the measure that a curved wall section of the outer receptacle is cut away by means of a rotating tubular knife or a hollow knife in such a manner that a hole is formed in the outer wall. During the cutting operation, which is carried out at a flat angle, the inner bag is not damaged, but pressed away inwardly.
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