B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1068, 18/1071
B29C 17/04 (1980.01)
Patent
CA 1077668
METHOD FOR FORMING INVOLUTE PLASTIC ARTICLES FROM THERMOPLASTIC SHEET MATERIAL ABSTRACT OF THE DISCLOSURE A method for forming elongated and involute thermoplastic articles is dis- closed. Means are provided for controllably heating a sheet of thermoplastic material to form preselected temperature gradients through- out 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 elongat- ed conical shaped piece. To form involute thermoplastic articles, the elongated conical shaped piece is formed inside an involute fe- male mold, and air is introduced into the in- terior cavity of the elongated conical shaped piece to expand and press the material against the interior surface of the mold. - i -
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