Male core for forming vent slots in a thermoplastic closure

Details Male core for forming vent slots in a thermoplastic closure Male core for forming vent slots in a thermoplastic closure

1986-04-22

1987-04-14

Hoag, Willard E.

Static molds

Core

425577, B29C 4517

Patent

active

046572210

ABSTRACT:
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.

REFERENCES:
patent: 3556334 (1971-01-01), Howard
patent: 4007848 (1976-02-01), Snyder
patent: 4007851 (1976-02-01), Walker
patent: 4206852 (1980-06-01), Dunn et al.
patent: 4382521 (1983-05-01), Ostrowsky
patent: 4392055 (1983-07-01), Whitney
patent: 4427126 (1984-01-01), Ostrowsky

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