| 摘要 |
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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