Methods of producing molded products from foamed polypropylene p

Details Methods of producing molded products from foamed polypropylene p Methods of producing molded products from foamed polypropylene p

1986-01-29

1987-10-06

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264DIG15, 264DIG16, 425 4R, C08J 922

Patent

active

046981918

ABSTRACT:
A method of producing a polypropylene resin molded product from foamed polypropylene particles is disclosed, which comprises introducing a pressurizing gas into foamed polypropylene particles having closed cells so that the particles have an internal gas pressure of from 0.3 to 2.5 Kg/cm.sup.2 G, charging the particles in a mold cavity while compressing the particles with a pressurizing inorganic gas until the initial apparent volume of the particles is reduced to 50 to 99%, removing the gas from the mold cavity while keeping the foamed particles in a compressed state, and introducing steam in the cavity to cause adhesion of the compressed foamed particles. The method produces a molded product having satisfactory appearance and excellent adhesion among particles in a shortened molding cycle.

REFERENCES:
patent: 3504068 (1970-03-01), Zizlsperger et al.
patent: 4399087 (1983-08-01), Akiyama et al.

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