Male core for forming vent slots in a thermoplastic closure

A male core designed to be mateable with a female mold for forming vent slots in a thermoplastic closure. The male core comprises a cylindrical member having an end surface which forms an underside top surface and an inside surface of a downwardly depending skirt on the closure. A helical groove is...

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Bibliographische Detailangaben
Hauptverfasser:	URMSTON, HUGH C, POHLENZ, ELMER E
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS CONVEYING HANDLING THIN OR FILAMENTARY MATERIAL INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS STORING TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A male core designed to be mateable with a female mold for forming vent slots in a thermoplastic closure. The male core comprises a cylindrical member having an end surface which forms an underside top surface and an inside surface of a downwardly depending skirt on the closure. A helical groove is formed about the periphery of the cylindrical member which forms a thread on the inside surface of the skirt. At least one integral rib is formed in the cylindrical member which is arranged parallel to the longitudinal axis of the closure. The rib forms a vent slot in the closure which traverses the thread. Convoluted surfaces are formed on the cylindrical member which extend from each side surface of the rib to the bottom of adjacent helical grooves. The convoluted surfaces provide smooth radii on the ends of the threads adjacent to the vent slot which facilitate axial stripping of the closure from the male core without deforming the threads into the vent slot. This enhances the passage of pressurized gas through the vent slot to the atmosphere as the closure is removed from a container.