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New HM-85HL and HM-120HL horizontal liquid silicone rubber (LSR) injection presses from South Korea’s Heung Hwa Injection Machinery (Gyeonggi, Korea) adopt “cold runner systems” from Japan’s Seiki Corp. (Yamagata).

PlasticsToday Staff

April 14, 2010

1 Min Read
LSR machines get cold runner treatment

New HM-85HL and HM-120HL horizontal liquid silicone rubber (LSR) injection presses from South Korea’s Heung Hwa Injection Machinery (Gyeonggi, Korea) adopt “cold runner systems” from Japan’s Seiki Corp. (Yamagata).

“Our Spear hot runner system is highly suited to molding of small parts of 1g or less because the hot runner size is compact,” says Masami Itoh of the Rudiz Team at Spear. Itoh adds that in the past, compression molding has been the preferred route in Korea for silicone rubber on account of the lack of availability of local machinery options: “European machinery was viewed as expensive.” Now, the 85- and 120-tonne presses from Heung Hwa are expected to offer processors in the automotive sector in particular an affordable option. The Spear system uses a combination of a valve pin and retractable runner bush for injection, gate seal, and vulcanization in LSR injection.

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Spear, meanwhile, has also delivered numerous combination hot/cold runner systems for molding automobile keyless entry systems. “The parts are molded from polycarbonate and overmolded LSR in a four-cavity mold held at 136°C,” says Itoh.

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