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Transfer Moulding

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Transfer Moulding:

Transfer moulding is a combination of injection moulding and compression moulding and takes place on a compression press.

Elastomer of a set weight is placed in the transfer pot which is part of the mould.

As with compression moulding, the pot is closed by the press, heat is applied and pressure forces (transfers) the uncured elastomer down the sprues and into the cavity.

A small amount of excess material flows out of the cavity through vents, with other excess material lying in the sprue grooves and a mat of material left in the transfer pot.

With Transfer Moulding, the mould remains closed whilst the material cures, and when the mould is opened the parts and the material mat are removed and the flash trimmed by hand.


Frequently Asked Questions

Transfer moulding and injection moulding are two manufacturing processes used for shaping materials, primarily plastics and rubbers. Transfer moulding involves pre-heating the material and placing it into a pot. Under pressure, the material is forced through a gate into the mould cavity, where it cures into the final shape. This method is particularly suitable for encapsulating parts, such as metal inserts, and allows for more precise control over material placement. Injection moulding, however, involves melting the material and injecting it into the mould cavity under high pressure. It’s highly efficient for producing large volumes of complex parts quickly and is favoured for its speed and ability to fill intricate designs. While both processes are used in manufacturing a wide range of products, the choice between them depends on the project’s specific requirements, including part complexity, production volume, and the necessity of incorporating inserts.

At Keaflex, we recommend utilising thermoset materials such as silicones for transfer moulding projects, depending on the application’s specific requirements. These materials are chosen for their excellent chemical resistance, superior mechanical properties, and high temperature stability, making them well-suited for a diverse range of applications. Silicones, for instance, are highly valued for their flexibility, temperature resistance, and biocompatibility, ideal for products in the automotive and medical device sectors. Selecting the right material is crucial to achieving optimal part performance and manufacturing efficiency. We assess factors like material viscosity, curing characteristics, and the potential for incorporating additives or fillers to meet precise requirements. Our expertise ensures that we guide our clients towards the best material choice for their transfer moulding needs, ensuring high-quality results tailored to their specifications.

At Keaflex, our transfer moulding process is adept at handling a wide variety of part sizes and complexities, accommodating the diverse needs of our clients. Transfer moulding is exceptionally versatile, enabling the creation of intricate parts with tight tolerances, complex geometries, and fine details. This method is particularly suitable for small to medium-sized components, including those requiring embedded metal inserts or overmoulding. Our advanced equipment and technical expertise enable us to handle projects that demand precision and high-quality finishes. For more information about our transfer moulding capabilities, contact us directly.

Transfer moulding is a versatile process utilised across various industries for its ability to produce parts with intricate designs, tight tolerances, and high-quality finishes. Common applications and sectors that frequently benefit from transfer moulded parts include the automotive industry, for components like seals, gaskets, and under-hood electronics due to the process’s ability to handle high-temperature materials and precision. The medical sector also relies on transfer moulding for creating biocompatible, durable parts such as surgical tools, implants, and healthcare devices, where cleanliness and precision are paramount. Additionally, the electrical and electronics industries use transfer moulding to encapsulate electronic components, providing insulation, protection from moisture and dust, and mechanical stability. Aerospace applications include lightweight, high-strength parts that can withstand extreme conditions. Consumer goods, from household appliances to wearable technology, also incorporate transfer moulded parts for their durability and high-quality surface finishes.

Yes, transfer moulding is particularly adept at incorporating inserts and facilitating overmoulding. This process allows for the precise placement of metal or other types of inserts into the mould before the rubber material is introduced. As the material is transferred under pressure, it flows around the insert, creating a strong bond and encapsulating the insert within the final part. This capability is invaluable for creating composite parts that require the mechanical strength of metal combined with the flexibility or insulative properties of rubber. Overmoulding, where a second layer of material is moulded over a previously moulded part to create a single piece with multiple properties, is also effectively achieved through transfer moulding. This process is used to add soft-touch surfaces, seals, or shock-absorbing layers to parts, making transfer moulding a versatile choice for complex multi-material components.

Transfer moulding, when compared to other moulding processes like compression or injection moulding, involves several cost considerations that can influence the choice of process for a project. Initially, transfer moulding might have higher tooling costs due to the complexity of the moulds and the need for a transfer pot and plunger system. However, it can offer advantages in terms of material savings and precision. Transfer moulding reduces waste by precisely controlling the amount of material used, and the process allows for tighter tolerances and less post-production finishing, potentially lowering overall manufacturing costs for complex parts. Additionally, transfer moulding’s ability to incorporate inserts and perform overmoulding can reduce assembly costs by integrating multiple components into a single moulded part. While the upfront costs might be higher, the efficiencies in production, material use, and part quality can make transfer moulding a cost-effective option for specific applications, especially where part complexity or the need for inserts makes other methods less viable. Ultimately, the best choice depends on a project’s specific requirements, including volume, part complexity, and budget constraints.

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