Injection molding system for threaded tamper indicating closures

Details Injection molding system for threaded tamper indicating closures Injection molding system for threaded tamper indicating closures

Filed on

1992-10-21

Date issued

1994-01-25

Examiner

Heitbrink, Jill L.

Patent Class

Plastic and nonmetallic article shaping or treating: processes

SubClass

Mechanical shaping or molding to form or reform shaped article

SubSubClass

Shaping against forming surface

Other Related Categories

264334, 425556, 425438, 425441, 425DIG58, B29C 4544

Type

Patent

Status

active

Patent number

052813851

Description

ABSTRACT:
A method of injection molding a container cap with a precision thread having a tamper indicating band depending from the bottom of the cap skirt. Collet jaws form at least a frangible connection between the bottom of the cap skirt and the top of the tamper indicating band, and these jaws are moved radially outward specified amounts during the molding process to provide clearance for stripping an inwardly directed retaining element on the band from the core and for ejection of the finished cap.

REFERENCES:
patent: 3737277 (1973-06-01), Uhlig
patent: 3904165 (1975-09-01), Den Boer
patent: 4496302 (1985-01-01), Brown
patent: 4497765 (1985-02-01), Wilde et al.
patent: 4552328 (1985-11-01), Dutt et al.
patent: 4595547 (1986-06-01), Herr
patent: 4709824 (1987-12-01), Thompson
patent: 4744480 (1988-05-01), Luch et al.
patent: 4751036 (1988-06-01), Barriac
patent: 4767587 (1988-08-01), Towns et al.
patent: 4806301 (1989-02-01), Conti
patent: 4904435 (1990-02-01), Babcock et al.
patent: 5061168 (1991-10-01), Fox
patent: 5067891 (1991-11-01), Julian et al.

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