Spray Up Molding Diagram

Chopped reinforcing fibers are sprayed onto a mold and wet with resin.

Raw Material
A yarn of reinforcing material is cut to a set length by a chopper/gun which immediately sprays them onto the mold.  Resin and catalyst design must accommodate a spraying process as well.

Single sided, typically composite tools are used for this process

Spray up parts normally have one visible, smooth side.  A gel coat can be added during molding to produce cosmetic finished surfaces.

Benefits Limitations
  • Robotic arms used for spraying can add automation, decrease variability
  • Lower cost to tool
  • Ideal for lower volumes
  • Higher cycle times
  • Produces only one smooth surface
  • Labor dependent, manual application can produce more thickness variation


Spray Up Molding

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Core Molding Technologies