Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Reexamination Certificate
2006-08-30
2010-11-23
Huson, Monica A (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
C264S259000, C264S328700, C264S328800, C264S328110, C264S328120
Reexamination Certificate
active
07837917
ABSTRACT:
In accordance with the present invention, there is provided a method of forming a molded plastic article (2) having a second surface (56) with molded extensions (59), e.g., structural supports, such as ribs, extending therefrom, and a first surface (69) that is substantially free of sink mark defects. The method involves forming, from a first plastic material, a first molded section (50) having at least one molded extension (59) extending from the second surface (56) thereof. The molded extension (59) is formed in a mold recess (23) having a reversibly positionable slide (14) therein. After formation of the first molded section (50), the slide (14) is retracted to a second slide position (B) thus forming within the molded extension a retainer cavity (74) that is in fluid communication with an aperture (71) in the first surface (53) of the first molded section (50). A second plastic material is introduced into the mold (1) over the first molded section (50), and a portion thereof passes through the aperture (71) and into the retainer cavity (74), thereby forming a second molded section (108) that is continuous with each retainer (96). The first and second molded sections, which together form the molded article (2), are fixedly attached to each other by at least one molded retainer (96), and the first surface (111) of the second molded section, which defines the first surface (69) of the molded article (2), is substantially free of sink mark defects. The present invention also relates to a molded article.
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Ervin Michael A.
Huson Monica A
LRM Industries International Inc.
M.A. Ervin & Associates
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