Method and apparatus for making plastic film, and plastic film
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 27, 2004
Grant Date -
N/A
app pub date -
Oct 4, 2000
filing date -
Apr 7, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A film is extruded from plastic material by an extruder. The film is orientated 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. During the orientation, gas is arranged to 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 over 70%.
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