Polypropylene resin foamed sheet for thermoforming and process f

Details Polypropylene resin foamed sheet for thermoforming and process f Polypropylene resin foamed sheet for thermoforming and process f

1991-03-20

1994-02-15

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264146, 264159, B29C 6722

Patent

active

052864286

ABSTRACT:
A polypropylene resin foamed sheet for thermoforming having compounded therein an inorganic fine powder is disclosed. The sheet contains 10 to 50% by weight of the inorganic fine powder, has a density of 0.2 to 1.2 g/cm and a thickness of 0.2 to 3 mm and having a percent shrinkage of 5 to 30% in each of the longitudinal and crosswise directions on heating at 190.degree. C. for 30 minutes, with the ratio of a residual rate in the longitudinal direction to that in the crosswise direction being from 1:0.7 to 1:1.1. The sheet is produced by extruding and foaming a compounded resin from a ring die of an extruder, and taking off the extruded tubular foamed sheet along a cylindrical drum whose diameter is 2.0 to 3.0 times that of said ring die.

REFERENCES:
patent: 3223764 (1965-12-01), Kuhn et al.
patent: 3394045 (1968-07-01), Gould
patent: 3649731 (1972-03-01), Cronin
patent: 3893957 (1975-07-01), Mixon et al.
patent: 3927159 (1975-12-01), Tomikawa et al.
patent: 4054550 (1977-10-01), Parker et al.
patent: 4111860 (1978-09-01), Jack
patent: 4146451 (1979-03-01), Schirmer
patent: 4206166 (1980-06-01), Hayashi et al.
patent: 4426065 (1984-01-01), Komatsuzaki et al.
patent: 4440703 (1984-04-01), Akiyama et al.
patent: 4459250 (1984-07-01), Miura et al.
patent: 4475039 (1984-10-01), Borst et al.
patent: 4525317 (1985-06-01), Okada et al.
patent: 4657715 (1987-04-01), Myers et al.
patent: 4680157 (1987-07-01), Fujii et al.
patent: 4719039 (1988-01-01), Leonardi

Affiliated with

Also associated with

Rating

Polypropylene resin foamed sheet for thermoforming and process f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polypropylene resin foamed sheet for thermoforming and process f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polypropylene resin foamed sheet for thermoforming and process f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1204645