Injection molding for rubber parts is considered to be a bit more complicated and sophisticated than compression molding and transfer molding. Typically reserved for higher quantity needs, injection molding is a valuable resource and can be used for very small to quite large size parts. The Vip team has over half a century of experience in the rubber industry and can guide you in choosing which method is best for your part.

Process of Injection Molding

A. Uncured rubber is placed into the machine using a screw feeder system. There is no need for preforming with this process

B. The injection machine, via the screw feeder, will bring in the exact quantity of material needed for the mold. There is no guesswork with rubber injection, and therefore no material waste.

C. The rubber material moves into the barrel, where it is heated and becomes pliable, and is then pushed by a plunger into the runner system.

D. The material will fill the mold cavities and begin to cure. As soon as the curing process is complete, parts can be removed and the process can begin again.

Advantages of Injection Molding

  • Fast production and cycle times
  • No need for preforms (reduced labor, less material waste)
  • Good for complex parts
  • Less flash (less post-production labor)
  • Good part repeatability on future orders

Disadvantages of Injection Molding

  • Not suited for all compounds
  • Higher Tooling Costs

Ready to see if rubber injection molding is right for your job? Contact us today.