Method and apparatus for making plastic film, and plastic film
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United States of America Patent
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Sep 21, 2004
Grant Date -
N/A
app pub date -
Mar 11, 2002
filing date -
Sep 10, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for making a plastic film, and to a plastic film wherein the method includes extruding a film from plastic material by an extruder and orientating the film after extrusion. Material is mixed into the plastic so that when the plastic film is stretched, cavitation bubbles are formed in the material particles mixed into the plastic. After orientation, gas is arranged to act on the plastic film under high pressure so that the gas diffuses in the cavitation bubbles and causes overpressure in them. Thus it is possible to make a thin foamed film with a foaming degree of over 70%.
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