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The Production Process

The Rotational Molding process involves five production stages:

  • Service Station #2
    • Mold is opened
    • Inserts and graphics are installed on the
      inside surface of the mold
    • Resin is dispensed into the mold
    • Mold is closed and clamped shut
  • Oven (450-600°F)
    • Mold is rotated at a ratio that will produce
      even resin coverage
    • Oven is heated to cause the resin to melt and
      stick to the inside surface of the mold
  • Intermediate (Fans)
    • Mold moves to this station for a predetermined
      period of slow air cooling
  • Cooler (Water Spray and Fans)
    • Fans and fine water spray cool the mold to a desired temperature
  • Service Station #1
    • Insert holders and other removable features are
      removed from the mold
    • The hollow plastic part is de-molded and placed
      at the trim station for secondary operations
rotational molding machine schematic

At the trim station, all cutting and cleanup operations are completed. This may include drilling, routing, CNC, and cutting operations as well as flushing and cleaning steps. Parts are then ready to be packaged and moved to the shipping staging area.