METHOD AND APPARATUS FOR MOLDING AN INTERLOCKING TAB IN A SINGLE MOLDING AND FORMATTING STEP

摘要

The present invention relates to a method and apparatus for molding plastic articles. More specifically, the present invention is directed to a staged sequentially separated apparatus for injection molding of plastic panels having a flap or tab molded therewith in a single molding and forming step. The present invention provides, among other things, a method and an apparatus for forming an injection molded part with an undercut, the undercut lying generally in a plane of a major portion of the part, the undercut having an open elongate opening and being positioned between an elongate integrally molded tongue and panel. The apparatus comprising a first mold half with a first mold cavity defining surface, a second mold half with a second mold cavity defining surface, a tongue member carried by the second mold half and projecting into a mold cavity. The tongue member having generally opposing facing surfaces spaced from the first and second mold cavity surfaces for forming opposite face of a molded part undercut. The apparatus also comprising means to selectively effect movement of the transverse mold insert relative to at least a portion of the remainder of the second mold half.