A Brief Explanation Of Transfer Molding Process

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

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

How Does Transfer Molding Process work?

Transfer molding process explanation(Image Source: subtech.com)

In the transfer molding process, the preform plastic material is provided as a 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 the pot or gating system, a plunger or piston system pushes the material inside the cavity of the mold.

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

What Are The Types Of Transfer Molding Processes?

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

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

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

Advantages And Disadvantages Of Transfer Molding Machines

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

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


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

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