Method for making oriented polyethylene foam and foam produced thereby
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United States of America Patent
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-
Jun 12, 2001
Grant Date -
N/A
app pub date -
Mar 15, 1999
filing date -
Mar 15, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for making an oriented foam generally includes the steps of: a. blending molten polyethylene and a blowing agent to form a foamable mixture; b. producing a foam by extruding the mixture at a predetermined rate through a die and into a region of reduced pressure so that the blowing agent expands within the mixture; and c. orienting the foam by drawing the foam out of the die at a rate that is between 1 and 1.5 times greater than the predetermined rate at which the mixture is extruded.
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