Flexible packing material in sheet or web form

Details Flexible packing material in sheet or web form Flexible packing material in sheet or web form

1991-10-15

1993-06-29

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264524, 264171, 2642102, 264284, 264295, 264339, 264349, 425327, B29C 5306

Patent

active

052231941

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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