Method of manufacturing foamed polypropylene resin sheet

Details Method of manufacturing foamed polypropylene resin sheet Method of manufacturing foamed polypropylene resin sheet

1988-05-02

1989-05-23

Anderson, Philip

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

264 453, 264 455, 264 459, 264 50, 264 53, 264 54, 264321, 264DIG16, 425113, 425325, 425817C, B32B 520, C08J 934, B29C 6722, B29C 4706

Patent

active

048327700

ABSTRACT:
According to a method of manufacturing a foamed polypropylene resin sheet of this invention, a composition comprising as a resin component a mixture of 80 to 20 wt % of a crystalline propylene-ethylene block copolymer containing 20 wt % or less of ethylene and having a melt index (MI) of 2 or less and 20 to 80 wt % of a crystalline propylene-ethylene block or random copolymer containing 5 wt % or less of ethylene and having an MI of 6 to 20 or a polypropylene homopolymer having an MI of 6 to 20 is used. A pair of molding roll dies is horizontally arranged at a point separated from the center of an apex of an extrusion foaming die when a foamed sheet is to be extrusion-molded. A distance between the center of the roll and the apex of a base lip is set to fall within a range of (R.sup.2 +25).sup.1/2 to (R.sup.2 +144).sup.1/2 where R is a radius of the molding roll die. The composition is extrusion-molded into a foamed sheet without collapsing while a fluid is supplied to the interiors of the rolls so that a surface temperature of the foamed sheet passing between the molding rolls is set at 105.degree. C. or less. The extrusion-molded foamed sheet is cooled thereafter.

REFERENCES:
patent: 2905972 (1959-09-01), Aykanian et al.
patent: 2945261 (1960-07-01), Aykanian et al.

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