Process and apparatus for producing gas pressurized foam particl

Details Process and apparatus for producing gas pressurized foam particl Process and apparatus for producing gas pressurized foam particl

1988-04-25

1989-02-14

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 51, 264DIG5, 264DIG15, 264DIG18, 425 4R, B29C 6722

Patent

active

048045071

ABSTRACT:
Closed-cell foam particles are pressurized to produce particles useful in a process using secondary foaming to achieve a lower density foam. Closed-cell foam particles are initially compressed in a first stage compression tank and then transferred to a main gas pressurization tank. The main gas pressurization tank comprises multi-level shelves, each with a set of compartments. Charges of foam particles pass sequentially through the shelves while becoming fully pressurized. The multi-level shelves with means to move charges of foam particles from shelf to shelf are responsible for the closed cell foam particles becoming pressurized in an efficient manner.

REFERENCES:
patent: 3953558 (1976-04-01), Hatano et al.
patent: 4360484 (1982-11-01), Rubens
patent: 4693856 (1987-09-01), Rubens et al.

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