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Rubber Transfer Molding

Rubber Transfer Molding differs from Compression Molding in that instead of placing a rubber preform in each cavity of the mold, a sheet of rubber the exact size and weight is placed in a pot above the cavities. These sheets are made using a three (3) roll calender. Using a heated hydraulic press the mold is forced closed and the rubber is transferred through sprews from the pot to fill each cavity. Cavities shaped like the part to be produced are cut in steel plates much the same way they are in compression molds. However in Transfer Molding additional plates are added to the top of the mold to form a pot and ram where the uncured calendered rubber is placed. Pressure forces the rubber from this pot through sprews to fill each cavity. Thus the term Transfer Molding which is transferring the rubber from one area of the mold into the cavities. At the end of the required time and temperature to cure the part the mold is opened, the residual cured rubber transfer mat is removed from the pot and the parts are unloaded from the cavities. Transfer Molding uses more rubber and creates more waste, but allows small parts to be made more economically because the process of placing a rubber preform in each cavity is eliminated which reduces the cycle time. In most cases as in Compression Molding after parts are molded they must go through some sort of deflashing to remove flash.

Transfer Molds are run in the same type press as are the Compression Molds and can range in size up to thirty six (36) inches square with cavities ranging from single cavity to six hundred and twenty four (624) cavities.




Rubber Transfer Molding

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