Method for making multicolored foam

Details Method for making multicolored foam Method for making multicolored foam

1988-02-26

1990-04-24

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264146, 264245, B29C 4704

Patent

active

049198645

ABSTRACT:
A method and apparatus for the preparation of multicolor, multidensity and/or multithermoplastic foam and products composed thereof. Heat-plastified foamable gels of a thermoplastic resin or resins containing blowing agents are combined and extruded simultaneously through the same orifice of a die and expanded into a foam.
The color, density and/or thermoplastic resin of the secondary foamed gel or gels can form a multitude of patterns or shapes that include waves, diagonals, stripes and/or continuous coverage over the entire surface of the primary foamed gel. These patterns or shapes can be on the surface and/or within the cross-section of the primary foamed gel.

REFERENCES:
patent: 3972970 (1976-08-01), Taylor
patent: 4048101 (1977-09-01), Nakamachi et al.
patent: 4181647 (1980-01-01), Beach
patent: 4182734 (1980-01-01), Takano et al.
patent: 4248824 (1981-02-01), Hattop

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