Thomas P Parrott

US Patent:

41559720, May 22, 1979

Filed:

Sep 6, 1977

Appl. No.:

5/830593

Inventors:

David A. Hauser - Rockford IL
Thomas J. Parrott - Rockford IL

Assignee:

Keystone Consolidated Industries, Inc. - Peoria IL

International Classification:

B29C 500
B29C 2100
B29D 300

US Classification:

264250

Abstract:

An improved method for molding a unitary molded product comprised of three separate plastic materials includes the first step of molding the generally highest melting point, most abrasive, most viscous plastic material to mold a first form. Subsequently, the next generally lower melting point material is molded using the first form as a mold. Finally, the generally lowest melting point material is molded. By molding in a designated order, it is possible to mold a single product comprised of multiple plastic materials without having the materials bleed into one another. Additionally, a variety of materials having distinct melting points may be used to make a unitary molded product.