METHOD AND APPARATUS FOR PRODUCING PLASTIC FILM
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United States of America Patent
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Issued Date -
Jan 8, 2009
app pub date -
Feb 22, 2007
filing date -
Feb 24, 2006
priority date (Note) -
Abandoned
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Abstract
Plastic material and nucleating agent are fed into an extruder, and the plastic material is subjected to cell forming. The substances in question are extruded into a plastic film preform, simultaneously cooling the material to prevent foaming. The film preform is stretched in such a way that cavitation bubbles are generated in the film. The cell forming takes place in connection with stretching and relaxation. In other words, in the solution the cell forming is caused to take place when the plastic is not in a molten state.
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