Types of Rubber Molding - Injection - Compression

Rubber molding types can be accomplished using one of three different processes. In addition to the basic operational differences between them, the three types of molding can be distinguished by the cost of operation and the consistency of the product.

The simplest and cheapest rubber molding process, called compression molding, is also the crudest way to mold rubber. During compression, an operator lays a sheet of rubber in the mold and the machine’s two haves compress to form the part, hence the name.

Transfer rubber molding is another option. It is considered a step up from compression, both in price and in quality of work. For this process, a slug of the material is placed in a pot and the machine forces it into the mold.

The final and most precise method is injection molding. Injection molding functions similarly to transfer, however it is a “screw-in” process. The nozzle is lowered into the mold and the machine fires a precision shot size into the mold. Due to its repeatability, and the consistency of the product, injection molding is the generally preferred method.

Twin Pines can manufacture all three types of rubber and plastic molding machines since all are necessary to certain operations. Our emphasis on quality has led us to specialize in injection molding machines since they produce the most reliable product.


If you have questions or would like more information on the right type of rubber molding to best suit your applications, please call us at 724-459-3850 or click here to contact us online.

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