Closures for plastic containers adapted for automated insert molding

A closure assembly for the dispensing of fluids from plastic containers such as pails. The closure assembly is adapted for automated insert molding attachment to container lids. The closure assembly is pre-assembled from a threaded plastic closure cap and closure body prior to insert molding. The plastic closure body has a nestable and extendable conical body web leading inward to a body neck closed by a tamper evident diaphragm seal. The conical body web leads outward to an improved radial body clamp flange and novel cylindrical body skirt. Cap bails lie radially inside and brace the body clamp flange from distortion. Once inserted and clamped into the container lid mold, only the body skirt is exposed for attachment to the container lid. Molten plastic is introduced into the mold void to form the container lid. This patent discloses optional body skirt recesses. During molding the introduced polymer envelopes the body skirt and enters the skirt top recess and skirt bottom recess mechanically locking the skirt to the lid. The plastic bond and/or mechanical lock between the body skirt and the plastic container lid combined with the diaphragm seal in the body neck resist leaks and provide tamper evident means.