Method and Apparatus for Producing Plastic Film
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United States of America Patent
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Issued Date -
Sep 18, 2008
app pub date -
Jun 5, 2006
filing date -
Sep 19, 2005
priority date (Note) -
Abandoned
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Abstract
A film (5) is extruded from plastic material by means of an extruder. Material is mixed into the plastic (5a) of the plastic film (5) before the extrusion so that cavitation bubbles are formed in the material particles mixed into the plastic (5a) when the plastic film is stretched. The film (5) is orientated by stretching. After the extrusion the plastic film (5) is cooled slowly below the crystallization point of the plastic material before the orientation.
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