compression moulding

Transfer Moulding

Camberley Rubber Mouldings is one of the premier transfer moulding suppliers in the UK. We produce a full range of bespoke rubber products for customers all over the world, using a variety of rubber moulding methods including transfer rubber moulding.

Transfer moulding is similar to the compression moulding process, with the addition of a transfer pot and feed hole to the cavity. This process offers high-quality repeatable parts and as the tool is completely closed it has less ‘flash’ when compared to the compression process, yet retains the advantage of lower tooling cost.

In transfer moulding, the compound is fed into the cavity by the cylinder under pressure from the top plate as the press closes.

The closed tool is placed into the press with the uncured rubber slug positioned in the transfer pot. On closing the press, the rubber is transferred into the cavity under pressure, forming the shape of the cavity. Pressure and temperature are maintained for a pre-determined time to ensure that the curing process is complete. The part is then removed from the tool and the transfer injection marks removed to the required finish.

Transfer Rubber Moulding
Rubber Moulding Compression
compression transfer moulding
How it works

Step 1
A piece of cold uncured rubber compound is placed into a portion of the mould called the “pot.” The piston (on the top-most part of the mould) fits snugly into the “pot.”

Step 2
The mould is placed between the heated platens of the press which closes under hydraulic pressure, as the “piston” pushes down into the pot the rubber is forced through the small hole (the “gate”) into the cavity forming the shape of the finished moulding. The mould remains closed under pressure and heat until the rubber is completely cured and ready for removal.

Step 3
The press opens. The tool is pulled forward and the pot lid removed along with the transfer pad excess rubber.

Step 4
The tool is opened, the moulding removed from the cavity and the transfer pip removed to the required finish.

The process is then ready to be repeated.

Our previous suppliers weren’t able to provide the reliability of production, cleanliness & quality we required but CRM quickly grasped the issues & worked hard to meet our needs.

 
Managing Director
Leading Manufacturer of Pharmaceutical Valves

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