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The difference between reaction injection molding and resin transfer molding

Source: Honkia Prototype   Published: 2016-07-01   Views: 396

Resin transfer molding (RTM) is also called liquid molding which is a simple process. It begins with a two-part, matched, closed mold that is made of metal or composite material. Dry reinforcement is placed into the mold and the mold is closed. Resin and catalyst are metered and mixed in dispensing equipment, then pumped into the mold under low to moderate pressure through injection ports, following predesigned paths through the preform. Extremely low-viscosity resin is used in RTM applications for thick parts to permeate preforms quickly and evenly before cure. Both mold and resin can be heated, as necessary, for particular applications. 

China Reaction Injection Molding

Compared with resin transfer molding, reaction injection molding injects a rapid-cure resin and a catalyst into the mold in two separate streams. Mixing and the resulting chemical reaction occur in the mold instead of in a dispensing head. Automotive industry manufacturers combine structural reaction injection molding (SRIM) with rapid preforming methods to fabricate structural parts that don’t require a Class A finish.

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