Method for manufacturing elements of expanded synthetic material

Details Method for manufacturing elements of expanded synthetic material Method for manufacturing elements of expanded synthetic material

1986-05-28

1988-07-12

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 51, 264DIG10, 425 4R, 425 4C, C08J 922, B29C 6722

Patent

active

047568593

ABSTRACT:
A method for obtaining expanded polystyrene products comprising portions of comparatively very different densities and thus of different mechanical strengths, in which a first mass of pre-expanded polystyrene beads of greater density is caused to partially cohere by means of steam, the resultant mass is placed in a mould of greater dimensions, said mould is completely filled with polystyrene beads of density less than the preceding, and cohesion is completed therein.

REFERENCES:
patent: 2983963 (1961-05-01), Jodell et al.
patent: 3026574 (1962-03-01), Takacs et al.
patent: 3043627 (1962-07-01), Torjusen
patent: 3225124 (1965-12-01), Wallace
patent: 3306959 (1967-02-01), Berner
patent: 4424177 (1984-01-01), Immel
The American Heritage Dictionary, Second College Edition Boston, Houghton Mifflin Company, .COPYRGT.1982, pp. 120 and 948.

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