Flexible packing material in sheet or web form
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United States of America Patent
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Jun 29, 1993
Issued Date -
N/A
app pub date -
Oct 15, 1991
filing date -
Aug 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Flexible, creased material in sheet or web form for use in the manufacture of liquid-tight packing containers of good dimensional rigidity includes one or more base layers laminated to one another. The base layer is a mineral-filled thermoplastics material comprising between 50 and 80% calculated on the total weight of the mixture, of an inorganic, particulate mineral filler. The thermoplastic material is chosen among propylene-based polymers with a melt index of between 0.5 and 5 according to ASTM (2.16 kg, 230.degree. C.) and the base layer or base layers are provided with a pattern of crease lines which have been formed by plastic deformation in connection with or immediately after the extrusion of the base layer or base layers.
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