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1. (WO1998052833) CLOSURE

Pub. No.:    WO/1998/052833    International Application No.:    PCT/GB1998/001467
Publication Date: Fri Nov 27 00:59:59 CET 1998 International Filing Date: Thu May 21 01:59:59 CEST 1998
IPC: B65D 41/04
Applicants: CROWN CORK & SEAL TECHNOLOGIES CORPORATION
CARNAUDMETALBOX PLC
COLLINS, Malcolm, George
Inventors: COLLINS, Malcolm, George
Title: CLOSURE
Abstract:
A PT (Press-on/Twist-off) closure cap comprises a shell (2) including a skirt (4) and an end panel (3). A one-piece, preformed gasket (6) is secured in position within the shell, and performs a dual function, firstly to form a seal between the end panel (3) and an end sealing surface (12) on a container such as a glass jar, and secondly to provide a thread retention portion (8) between the skirt (4) and a thread finish (11) provided on the container. The thread retention portion (8) ensures that the closure may be initially applied by an axial movement and subsequently removed by a rotary movement. The preformed gasket is preferably formed of a polypropylene material or a Thermoplastic Elastomeric material having a flexural modulus of between 30 and 900 MPa.