Simulation of Cavity Filling and Curing in Reaction Injection Molding

  • L. T. Manzione
Part of the Polymer Science and Technology book series (POLS, volume 18)


Reaction injection molding1 is polymerization and processing in a single cyclic operation. It consists of several distinct processes. Reservoirs of one, two, or more components are metered according to a pre-determined ratio and then conveyed under pressure to a mixing head. The fluids are either mixing activated in the head or thermally activated upon injection into the mold cavity. Considerable viscosity increase can occur during cavity filling, the extent depending on the fill time and resin reactivity. Most of the chemical conversion usually occurs during the mold curing step after the mold has been filled. The part is ejected after some fixed mold residence time which allows the part to attain dimensional stability. The cycle time includes the time for cavity filling, mold curing, and mold preparation and it is often desirable for it to be a minimum. Excessive cycle times due to long cure times may eliminate or limit the use of a molding resin in a particular application.


Cycle Time Time Increment Reactive Fluid Mold Wall Chemical Conversion 
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Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • L. T. Manzione
    • 1
  1. 1.Bell LaboratoriesMurray HillUSA

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