Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1971-09-02
1976-06-15
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264DIG9, B29D 2700
Patent
active
039638162
ABSTRACT:
Molded articles are made from expandable thermoplastic resin material by pre-expanding the thermoplastic material in particulate or bead form containing as the principal expanding agent a liquid hydrocarbon by contact with steam until the desired degree of expansion is obtained, heating the beads in a stream of substantially dry, hot gas at a temperature above the boiling point of the hydrocarbon but below the fusion temperatures of the thermoplastic material while agitating the beads to prevent agglomeration upon softening until substantially all of the moisture is removed from the surfaces of the pre-expanded beads, and molding the article from the heated pre-expanded beads by placing them in a closed mold and heating them to a temperature above their fusion temperature, the temperature of the thermoplastic material being continuously maintained above the boiling point of the expanding agent from the time the beads are pre-expanded until they are molded into the shaped article.
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Anderson Philip
Foster Grant Co., Inc.
Selman Leonard S.
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