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

摘要

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 fr om the resin passageway and into the cavity. The steps of the mold method are a s follows: the mold tool stack is closed to form the cavity; the valve is open ed to allow resin to enter the cavity; the valve is closed; the resin is allowe d 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 marking s thereon.