transfer rubber molding

Transfer molding is an extension of compression molding optimized for higher volume production runs. Unlike compression molding, transfer molding uses an additional plate to push uncured rubber into the product cavities. A top plate acts as a plunger that pushes uncured rubber into the middle plate, which contains a transfer pot and holes through which the rubber flows. Uncured rubber is placed into the transfer pot and the mold is closed. When pressure is applied by the rubber press, the plunger forced the uncured rubber in the transfer pot, through the sprues into the product cavities where heat from the press vulcanized the product.

advantages of transfer molding

• Shorter production cycle
• Compound preparation is reduced (less cut-time)
• Product finishing time is reduced (less flash)

disadvantages of transfer molding

• Expensive tooling
• Molds are complex
• More compound waste