Transfer Moulding, is very similar in many ways to the Injection Moulding process, and involves having a ‘piston/cylinder’ built into the mould tool, so that the rubber may be transferred into the cavity through small transfer holes.

transfer moulding 1		 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."
transfer moulding 2

Step 2 - The mould is closed up and under hydraulic pressure the rubber is forced through the small hole (the "gate") into the cavity. The mould is held closed while the rubber cures under heat.
transfer moulding 3

Step 3 - The plunger is raised up and the "transfer pad" material may be removed and thrown away.
transfer moulding 4

Step 4 - Mould is opened and the part can be removed. The flash and the gate may need to be trimmed.


Advantages of Transfer Moulding

  • Provides more product consistency than compression moulding
  • Better than compression moulding for rubber-to-metal bonding
  • Product consistency is better than compression moulding

Disadvantages of Transfer Moulding

  • The transfer pad is scrap
  • Cycle time is longer than injection moulding
  • Product consistency is poorer than injection moulding