In the transfer moulding process, the predosing moulding compound is inserted into a cylinder. A piston presses the material into the cavities after the mold ist closed. This process ranges between the compression moulding and the injection moulding.
Transfer moulding is a solution for multicavity molds. Similar to the injection moulding method, free flowing masses with maximised flow characteristics are required. The injection cylinder is integrated in the mold which is closed completely before the injection procedure. The cycle times are shorter than during the conventional pressing method due to the fact that the material absorbs additional friction energy when flowing through the narrow sprueing channels, hence allowing it to react quicker than during the plain pressing process. Due to the frictional heat, the mass has a low viscosity which helps protect sensitive inserts within the tool.
In order to keep the process constant, it is important that the volume and weight of the moulding compounds are identical during the process. For this reason, the material can be tabletted.