B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/1027, 190/150
B29D 7/00 (2006.01) B29C 47/00 (2006.01) B29C 47/10 (2006.01) B65D 5/00 (2006.01) C08J 5/18 (2006.01) C08L 23/00 (2006.01)
Patent
CA 1063745
ABSTRACT OF THE DISCLOSURE This invention discloses a novel plastic sheet material which has a wide range of uses, for example, as a substitute for cardboard and paper, as drinking cups, food containers and the like. The material is made by compound 5 to 70 parts by weight of inorganic particulate material with 95 to 30 parts by weight of polyolefin resin including poly- propylene, polypropylene-ethylene sequential copolymer, poly- propylene-ethylene random copolymer, high density polyethylene or a mixture thereof. The compound is carried out by mechanical working to generate heat and to disperse the inorganic material evenly throughout the resin to produce a molten mass of uniform consistency having a melt flow index of between 0.55 and 2.2 cc/10 minutes at 230°C under a load of 216 Kg. The mass is subsequently converted into a sheet in a thickness of 0.1 - 1.2 mm by extrusion and/or calendering. This material is waterproof, easy to work, and may be used to produce a variety of products which are readily acceptable to the consumer. The invention also discloses a method for making folded containers and the like.
252170
Gaunt Thomas N.
Harrison Peter
LandOfFree
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