Internal blow molding process and product

B - Operations – Transporting – 29 – C

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18/509

B29C 49/48 (2006.01) B29C 49/76 (2006.01)

Patent

CA 1202156

ABSTRACT There is provided a new and useful method for producing in a cylindrical thermoplastic material an internal thread comprising blow molding the thermoplastic material in a mold in which the surface of the mold defining the outer face of the thread is at a negative angle of at least 5 degrees to the planes perpendicular to the axis of the cylindrical material.

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