Flattened tubular film and process for manufacturing such a film
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United States of America Patent
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Apr 1, 2003
Grant Date -
N/A
app pub date -
Jan 15, 1999
filing date -
Jan 16, 1998
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Abstract
The invention relates to a flattened tubular film (1) made of thermoplastic material, in which the inner faces are not welded or glued, and are in mutual contact only over a part of their surface, thus forming a plurality of cells (3) of determined shape, essentially hermetic, containing a gas. The invention also relates to a process for manufacturing such a film, by extruding a preform, introducing a gas into the preform and flattening using at least one cylinder (2) whose surface has a relief such that, during the flattening, the two inner faces of the film come into mutual contact only over a part of their surface, thus forming a plurality of cells of determined shape, substantially hermetic, in which the said gas is imprisoned.
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