A Brief Explanation Of Transfer Molding Process

Just like compression molding processes, transfer molding process is also very important and common process to produce parts from thermosetting materials. There are main differences of transfer molding processes compared with compression molding, which is the most wonderd about transfer molding process. In here, you can find the information about;

  • Working principle of transfer molding process,
  • Types of transfer molding process,
  • Materials used and parts that produced by using transfer molding process.

How Transfer Molding Process Works?

Transfer molding process explanation(Image Source:

In transfer molding process, the preform plastic material is provided as liquid or semi-liquid state inside a pot or sprue/gating system. This form of thermosetting material is produced via special ovens. When the charge is supplied inside pot or gating system, a plunger or piston system pushes the material inside the cavity of mold.

Inside the cavity, curing of thermosetting material takes place. After the curing of plastic is done inside mold cavity, mold is opened, and the cured part inside mold cavity is detached from mold with ejector pins.

What Are The Types Of Tranfer Molding Processes?

In general application of tranfer molding machines, there are two types avaliable in plastic industry. But, there is a slight difference between these types of transfer molding processes.

In plunger transfer molding process, the preform is directly pushed inside mold cavity, and there is no gatings and sprues before the mold. In this type of tranfer molding process, discarded material is lower than other one, because of no requirement of gatings and sprues.

In pot transfer molding process, gatings and sprues are used, and charge material is not directly pushed inside mold cavity. When plunger is pulled, sprues and gatings are also come with plunger. This leads the discarding of material. This discarded side of injected part is called as cull.

Advantages And Disadvantages Of Transfer Molding Machines

Thermosetting polymers are generally used in tranfer molding machines. So, discarded material is cured material, and can not be recycled because of that. This is the biggest down side of the tranfer molding process.

The main advantage of transfer molding process is the intricateness of produced products compared with compression molding process. But, plastic injection processes produce much more intricate part compared with transfer molding process.


So, transfer molding process is an also very important process to produce elastomer and thermosetting parts.

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