US Patent 7011777 Assembly for holding plastic film within a mold

A mold tool includes upper and lower sections defining a cavity within which a plastic film preform is placed before injection of plastic forming a molded article. The plastic film extends between an interface defined between the sections of the mold. The interface secures a position of the plastic film within the mold tool preventing movement during injection of plastic. The interface is specifically configured to secure the plastic film without damage. The specific configuration of the interface is determined according to a relationship between molding process parameters and physical characteristics of the plastic film.