Injection Molding — a more complicated process than compression or transfer molding — is utilized for a variety of applications. It can be used to produce very small parts to entire automobile body panels.
During the rubber injection molding process, uncured rubber is extracted into the machine using a screw feeder system. The screw feeder takes in the exact amount (or shot size) of material needed to create the desired number of parts.
Rubber is fed from a hopper into a heated barrel and the material is slowly pushed by a screw-type plunger into a heated chamber. Material is then preheated to a state that will allow material to flow through a gate and runner system to fill the desired cavities evenly. The mold remains at a set temperature so it can solidify once it is filled. When material has reached a cured state, the mold will open and parts can be removed manually or using a brush system to strip them off of the mold.
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