Method of producing a plastic pin having an insert in a neck por

Details Method of producing a plastic pin having an insert in a neck por Method of producing a plastic pin having an insert in a neck por

1995-06-02

1996-04-23

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 467, 264 469, 264267, 264510, 264516, 473119, B29C 4406, B29C 4412

Patent

active

055100678

ABSTRACT:
A method of producing a plastic pin, including a bowling pin, having a cellular and/or porous core that is surrounded by a solid-walled, noncellular and nonporous shell. The shell is initially produced as a whole body in a mold. While the material of the shell is not yet hardened and is still deformable, an insert is introduced into the narrowed neck portion of the shell, in a direction axial relative thereto, in such a way that the insert displaces an inner layer of the shell, dividing the hollow interior of the shell into an upper and a lower chamber and producing a fixed connection with the material of the shell. Material for the core, with such material being provided with an expanding agent, is then introduced into the shell, and after the shell and the core have set, the mold is removed.

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