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Regular visitors to the Koplas show in Korea would easily have thought they'd come across a new supplier of injection molding machinery if they walked up to the booth of Dongshin Hydraulics. Replete with a new logo and a black and white machine livery, the company's new equipment offerings drew accolades from visitors and fellow exhibitors alike.

March 16, 2015

2 Min Read
Koplas: Korean injection machine builder Dongshin reinvents itself


Dongshin CEO Kim: "Machines totally redesigned from the ground up."


PP containers molded in an ultra-fast cycle with IML to boot.

"This is the fruit of a four-year program where we went back to the basics, tried to discover what fundamental knowledge we possessed in house, and reevaluated the performance and quality of our machines," says Dongshin CEO Phillip Kim, who took over the company's reins from his father four years ago. "We realized that European and Japanese machine builders have this basic, fundamental knowledge [of the injection process] and this translates to consistent quality and performance. This is what we target." Part of this drive entailed developing the company's own controller in-house.

Kim says he has hired a lot of young engineers and trained and disciplined them to build better machines but in the end, "the market will decide whether we will be successful or not." Dongshin machines have always sold for a premium over competing Korean machines according to Kim but a 15% premium is not substantial if Dongshin manages to prove to the market that its machines turn out fewer reject parts. "South Korean processors are slowly starting to realized that fewer defects means more profit," he notes.

On show at the Dongshin stand at Koplas were the GB series of all-electric injection machines outfitted with Bauer servomotors and available in clamping forces of 50 to 300 tonnes. The 300-tonne unit on show was molding a 0.4-mm-thick polypropylene (PP) container in an eight-cavity tool with in-mold labeling in a cycle time of 3.5 seconds. "The machine employs two servomotors on the injection side but we have the flexibility to add a third one for even faster injection speed," says Kim. The standard configuration delivers an injection speed of 400 mm/second.

Also in the packaging sector, the PB (for PET Bottle) 300 machine was molding three-layer preforms incorporating an EVOH barrier layer. The "baby injection unit" employed in the machine can be utilized with other Dongshin machine offerings.

Dongshin also showed the mini PL10 servo-hydraulic plunger machine molding cellphone camera lens housings in a shot size of just 0.5 g for four cavities. "Shot size variation is just 0.004 grams," says Kim.

Another highlight from Dongshin was the two-shot TC130 press, with one injection unit handling liquid silicone rubber (LSR). Rounding out the booth were a metal injection molding machine (the ME220) injecting an aluminum alloy, a servo-hydraulic machine (the ET120) and a vertical a servo-hydraulic machine (the Vr110).

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