| 摘要 |
An expandable cavity core element for use in a method and system for molding a plastic article having inward or outward projections on the exterior surface. The injection mold has an expandable cavity core element adapted to move between a closed, molding position and an open, article-recovering position and which defines a mold cavity for an article to be molded. The cavity element has a base with an opening therethrough and a plurality of outwardly tapered arms extending from the base to an open end that extends into the mold cavity where it is held in place by a striker plate during the injection molding process. The cavity element has an outer, tapered exterior surface length which is always equal to or larger than the total molding length of the interior molding cavity. The cavity element may include an outwardly tapered exterior surface or a multiple-tapered exterior surface, such as an outwardly tapered surface and then an inwardly tapered surface. Optionally, an inner mandrel mold part is employed, adapted to move reciprocally and longitudinally within the base and arms of the expandable cavity element, the top end threaded to form the interior threaded surface of the injection molded article.
|
