Serving the World since 1944

Rubber Injection Molding

Rubber Injection Molding is similar to transfer molding in that the rubber is forced through sprews or gates to fill the cavities using Injection Presses that are more automated than the hydraulic presses used to produce Compression and Transfer Molded parts. However, instead of using a transfer pot the preheated rubber is injected through a nozzle and runner system into the cavities forcing it into the shape of the cavities, utilizing a screw and ram injection unit mounted to the press. An uncured strip of rubber is feed into the screw of this injection unit which fills a heated cylinder with the correct amount of rubber material needed to fill the cavities. This strip of rubber is made in our in house modern Rubber Mixing Department. Due to the rubber material being hot when it is injected into the cavities, which is caused by heat in the injection unit and the heat generated from friction as the rubber is masticated and forced out of the injection cylinder and through the runners and sprews, the time required to fully cure the rubber part is less than other molding methods thus reducing the cycle time. Injection Molding is used where large quantities of a part are required and to produce large parts, particularly parts with thin walls and large surface areas.

Rubber Injection Molding is performed at Mid-States Rubber using a large number of presses varying in size up to seven hundred and fifty (750) tons.

Rubber Injection Molding


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