Rubber transfer molding requires creating a raw mix or rubber compound that is cut and weighed, or made into "pre-forms". Where transfer molding differs from compression molding is that the rubber is not put into the cavity of the mold then compressed, rather, it is compressed and injected into the mold.
this process for rubber molding makes it well suited for molding delicately shaped parts or securing inserts that are embedded in a product. This saves time, since we are only cutting one pre-form of rubber, instead of cutting one pre-form of rubber per mold in compression.
Stern Rubber Company’s transfer molding consists of a mold cavity similar to a compression mold. In addition, the transfer mold contains a transfer pot and a ram, where the rubber material is placed before compression. The mold cavity contains transfer holes, which connect to the transfer pot through sprues. During transfer molding, the ram is compressed and compounded rubber material flows through the sprues into the transfer mold cavity where under heat and pressure the rubber compound cures into the mold cavity configuration.
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