Injection Molding Process Developed for High-Consistency Rubber

Originally Published MPMN November 2001

INDUSTRY NEWS

Injection Molding Process Developed for High-Consistency Rubber

Equipment designers can now specify the use of high-consistency rubber in their injection-molded products through the use of a specialized injection molding process developed by Molded Rubber & Plastic Corp. (Butler, WI; www.mrpcorp.com). Called injection transfer molding (ITM), the process brings the cost, cycle times, and processing consistency associated with liquid silicone rubber to the molding of high-consistency rubber with its modifiable physical properties. "The ITM process has several benefits over previous methods used to process high-consistency rubber," says marketing and sales vice president Scott Pakenham. "It allows better injection control and incorporates a cold-pot method that minimizes material waste." Vacuum pressure used to pull air out of the tool and to eliminate flash is also cited as a benefit.

Suitable products for ITM include high-volume disposable parts that require inertness, clarity, and recoverability. The process can be used to produce deep and drawn parts, but this may require the use of rotating brushes to ensure demolding. The company also offers traditional liquid silicone rubber injection molding services.

Zachary Turke

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