Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1976-04-30
1978-05-09
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 406, 264 94, 264327, 425143, 425145, 4251744, 4253871, B29C 1704
Patent
active
040887189
ABSTRACT:
A method for forming elongated and involute thermoplastic articles is disclosed. Means are provided for controllably heating a sheet of thermoplastic material to form preselected temperature gradients throughout the sheet of thermoplastic material. Means are further provided for planarly supporting the heated sheet of thermoplastic material allowing for transverse motion of the heated sheet of thermoplastic material at the center thereof and further allowing for controlled slippage of the heated sheet of thermoplastic material toward said center thereof relative to the planar support means. Means are also provided for transversely forming a heated sheet of thermoplastic material into the shape of an elongated or involute plastic article. A plug is used to extend the heated sheet of thermoplastic material into an elongated conical shaped piece. To form involute thermoplastic articles, the elongated conical shaped piece is formed inside an involute female mold, and air is introduced into the interior cavity of the elongated conical shaped piece to expand and press the material against the interior surface of the mold.
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