Method for manufacturing packaging materials with a polyolefin foam layer
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United States of America Patent
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Oct 17, 2000
Grant Date -
N/A
app pub date -
Nov 24, 1997
filing date -
Feb 17, 1995
priority date (Note) -
Expired
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Abstract
A method in which a polyolefin foam layer is laminated to a sealing film having at least a first layer of a polyolefin. During the lamination a second layer is located between the first layer and the foam layer; the second layer is extruded therebetween and pressure is immediately applied. The second layer and the first layer are polyolefins each based on the same monomer as the main monomer of the foam layer. The same lamination technique may be used to laminate a sealing film to the other side of the foam layer, optionally at the same time as the lamination of the sealing film to the first side of the foam layer. Alternatively, the lamination technique may be used on one side of the foam layer, and the other side of the foam layer may be sealed by means of a coextruded layer.
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