Molding process for articles having an irregular shaped internal

Details Molding process for articles having an irregular shaped internal Molding process for articles having an irregular shaped internal

1986-11-26

1988-05-10

Kittle, John E.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

4285428, 264221, 264259, 264317, B28B 718, B29C 6344

Patent

active

047434813

ABSTRACT:
A process for making an article having an irregular internal passage utilizes a hollow polymer preform. The preform is filled with a relatively incompressible filler material such as a powder or a fluid, which supports the preform when it is placed in a mold, e.g. an injection mold. The filler enables the preform to withstand high molding pressures and prevents deflection and movement of the internal passage within the preform. The shell, a layer of a polymer material is then molded about the preform. After the final article has been formed, consisting of the preform and shell, the filler is removed for possible reuse.

REFERENCES:
patent: 2569935 (1951-10-01), Leguillon et al.
patent: 2995781 (1961-08-01), Sipler
patent: 3719735 (1973-03-01), Valyi
patent: 3929954 (1975-12-01), Valyi
patent: 3991146 (1976-11-01), Barrie
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patent: 4314964 (1982-02-01), Ferrary
patent: 4352772 (1982-10-01), Bezner
patent: 4424183 (1984-01-01), Nelson
patent: 4464324 (1984-08-01), Hager
patent: 4515842 (1985-05-01), Kovacs

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