Tire mold with air vent inserts

摘要

A tire mold having air venting passages or holes is provided with plastic inserts or plugs for the vent holes along the cavity side of the mold. The inserts are composed of a plastic material having a heat distortion temperature of no less than 275 DEG F. at 66 psi in accordance with ASTM D648 and a coefficient of thermal expansion less than 8x10-5in/in/ DEG C.