Transfer moulding is similar to the compression moulding process, with the addition of a transfer pot and feed hole to the cavity. This process offers high-quality repeatable parts and as the tool is completely closed it has less ‘flash’ when compared to the compression process, yet retains the advantage of lower tooling cost.
In transfer moulding, the compound is fed into the cavity by the cylinder under pressure from the top plate as the press closes.
The closed tool is placed into the press with the uncured rubber slug positioned in the transfer pot. On closing the press, the rubber is transferred into the cavity under pressure, forming the shape of the cavity. Pressure and temperature are maintained for a pre-determined time to ensure that the curing process is complete. The part is then removed from the tool and the transfer injection marks removed to the required finish.
