METHOD FOR MAKING PLASTIC OVERCAPS USING HOT RUNNER BACK-GATED MOLD TECHNOLOGY

Title:

METHOD FOR MAKING PLASTIC OVERCAPS USING HOT RUNNER BACK-GATED MOLD TECHNOLOGY

Document Type and Number:

WIPO Patent Application WO2004007288

Kind Code:

A3

Abstract:

The present invention is a method for making a plastic overcap (100) using a mold tool stack (10). The mold tool stack has a core (12) and a cavity plate (20) forming a cavity (22) therebetween. The core has a resin passageway (26) therein with a gate (24) in a top surface of the core. The gate has a valve (52) proximate the top surface of the core to regulate resin (28) flowing from the resin passageway and into the cavity. The steps of the mold method are as follows: the mold tool stack is closed to form the cavity; the valve is opened to allow resin to enter the cavity; the valve is closed; the resin is allowed to cool; and the mold tool stack is opened to allow removal of the plastic overcap from within the mold tool stack. The top side of the plastic overcap produced is blemish-free, facilitating placement of labels and other markings thereon.

Inventors:

KEIRSTEAD EARLE
MCCLEERY FREDRICK S
CONRAD WILLIAM A
KNIGHT ARTHUR G
HOOVER WILLIAM C
BUTLER THOMAS C
ONZIK DAVID D

Application Number:

PCT/US2003/021716

Publication Date:

April 15, 2004

Filing Date:

July 14, 2003

Export Citation:

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Assignee:

WEST PHARM SERV INC (US)

International Classes:

B29C45/00; B29C45/26; B29C45/27; B29C45/28; B29C45/40; B29C45/43; B65D51/00; (IPC1-7): A61J1/00; B29C45/23; B29C45/44

Foreign References:

US5284263A	1994-02-08
US5925303A	1999-07-20
US5635227A	1997-06-03
US6521165B2	2003-02-18

Other References: