Method for carrying out ventilation in a multi-walled container

Details Method for carrying out ventilation in a multi-walled container Method for carrying out ventilation in a multi-walled container

2004-03-26

2010-11-23

Huson, Monica A (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

C264S534000, C264S536000, C264S540000, C264S161000

Reexamination Certificate

active

07837927

ABSTRACT:
A method for carrying out ventilation in a multi-walled container of the type comprising a rigid external housing, inside which a flexible inner pocket for containing a product is arranged and connected to a withdrawal device without ventilation, the layers having no adhesion between the same such as to be able to be separated without difficulty and with air ventilation between the same, characterized in being obtained by means of molding a projection at the upper or lower part of the pre-form which is subjected to a first operation of cutting a sprue, then a second operation of cutting the projection in a region close to the base and/or the neck of the recipient for production and a third operation of separating the layers.

REFERENCES:
patent: 4816093 (1989-03-01), Robbins, III
patent: 5407629 (1995-04-01), Schmidt et al.
patent: 6083450 (2000-07-01), Safian
patent: 6106762 (2000-08-01), Agur et al.
patent: 2001/0032853 (2001-10-01), Kuehn et al.
patent: 0 182 094 (1990-08-01), None
patent: 1 199 152 (2002-04-01), None
patent: 1 043 235 (2003-05-01), None

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