Method and apparatus for processing a multilayer plastic film with a heat-sealable surface layer
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United States of America Patent
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Issued Date -
Apr 10, 2003
app pub date -
Oct 7, 2002
filing date -
Oct 6, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A multilayer plastic film having a heat-sealable surface layer is initially provided at a process temperature above a heat-sealing temperature of the surface layer. To prevent the surface layer from adhering onto a deflection roller, this layer must be cooled below the heat-sealing temperature. A cooling arrangement is positioned directly upstream from the deflection roller and blows cold air onto the heat-sealable surface layer. Thereby, the surface layer is rapidly cooled below the heat-sealing temperature, while most of the multilayer film is not substantially cooled and remains close to the process temperature. A counter-heater may heat the opposite surface of the plastic film as the cooling arrangement cools the heat-sealable surface layer.
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