Transfer Molding It is the process of forming (workpiece) into a mold (enclosed) of the thermosetting material, which is prepared into the reservoir and forces it through the runner/canal into the cavity using heat and pressure. In this molding transfer, small tolerance is required in all parts of the mold, so it is necessary for mold making, well consulted with a product designer, mold designer, and molder/operator to determine tolerance. Meanwhile, you may want to take a look at the excellent triple-c as well.
There are 2 types of transfer molding that is sprue type and plunger type
This plunger type determines a smaller pressure than the sprue type.
While Injection Molding, This process is very suitable for thermoplastic material, because with the installation of this material will soften and vice versa will harden again when cooled. The changes here are only physical, so it is not chemical (chemical), that means the softening and re-hardening process can be repeated at any time so as to enable recycling thermoplastic materials as needed.
The granulated plastic material is placed into a hopper that forces it into the injection cylinder. A number of materials to be processed will be driven with a piston in a heating cylinder. The heated and softened material such as this slurry will continue to be pushed through the nozzle and sprue bushing into the cavity of the closed mold.
The material transferred from the heating cylinder usually ranges from 1770 – 2740 C. Each material has a characteristic molding temperature. The softer the formulation is that it has a high plastic content, requiring a low temperature, whereas having ing a harder formulation requires high temperatures.
Most of the molds are always cooled because to speed up the hardening/freezing process of injected material into the cavity, so that it can be quickly removed for mold without damage, shortening its cycle time. This is done by flowing cooling water that surrounds the cavity in a molded frame/plate. Sometimes it is also necessary for heating the mold plate (keeping it at a certain temperature) for example up to 1700C especially for work-specific work and for maintaining a mold temperature