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Latest MK6-series injection molding machines boast enhanced energy savings.

Stephen Moore

February 24, 2017

4 Min Read
Chen Hsong 30th anniversary open house showcases latest technologies

Chen Hsong held an open house at its Shunde, Guangzhou, China plant late last year to commemorate the 30th anniversary of start-up of production at affiliate Foshan Chen De Plastics Machinery. Chen De manufactures SVP Series toggle clamping injection machines with clamping forces of 80 to 3000 tonnes.

More than 400 Chen Hsong customers and partners attended the event and witnessed the latest developments in injection molding machine technology at the Chen Hsong Group, took part in a technical seminar and Chen De factory tour, and enjoyed a 13-course celebratory banquet in the evening to round off proceedings.

MK6-series machines from Chen Hsong deliver enhanced energy efficiency, new levels of precision.

MK6-series machines from Chen Hsong deliver enhanced energy efficiency, new levels of precision.

One highlight of the event was the introduction of the latest generation machine of servo-hydraulic injection molding machines: the MK6-series. The company manufactures the MK6 injection machines at its flagship 560,000-m2 campus in Shenzhen, Guangdong Province, China, and they are currently available in clamping forces of 128, 168, 258 and 488 tonnes. Other machine models of clamping force 88, 208, 328, 408 and 600 tonnes are slated for release in 2017.

Designed from the ground up and featuring all-new streamlined hydraulics, the series is touted as an all-round performer and this capability was evident from the molding activities ongoing at the open house as well as the various molded products on show at the event. The 168-tonne clamping force JM168-MK6 unit on show at the Chen De open house was configured as part of a production cell for molding light switch components but it would be equally at home processing remote control housings thick toothbrush handles.

The JM168-MK6 machine was featured in a live demonstration of the molding of two distinct light switch components in the same four-cavity injection tool. These parts were robotically demolded, their sprues automatically removed, and then placed on a conveyor. These components were then assembled along with two other components using two additional robots to realize the finished light switch. The robots were supplied by E-Deodar.

A second MK6 machine on display, a 258-tonne JM258-MK6 unit, featured in a live demonstration of the molding of polystyrene (PS) disposable spoons in a 32-cavity mold at a cycle time of 15 seconds. The injection machine was integrated with an automated packaging line. MK6-series machines are particularly targeted at processors requiring rapid cycle times. Dry cycle time is only 1.7 seconds for the 258-tonne model.

The MK6-series is already receiving accolades from end users. One current user, stationery molder Inyan, says the machine is a cost-effective platform for production, and adoption of the Power Pack option makes it even more effective performance-wise. “We also enjoy energy savings through the servo-hydraulic architecture,” notes company president Ong Zelin. Inyan started using MK6 machines 6 months ago and is already operating its sixth machine, replacing another Chinese OEM in the process. The company trialled the machine and discovered that it was more cost effective and faster.

MK6-series machines employ SVP/3 servo-hydraulic technology that typically delivers 40% energy saving on average compared with the previous generation of machines. Chen Hsong is continuing to optimize the machines with the objective of achieving further energy savings.

Precision is also a hallmark of the MK6 lineup. A highly-optimized hydraulic design developed under the guidance of Japanese engineers and dubbed “Precision Hydraulics” realizes repeatability within 0.05% in critical movement axes.

Chen Hsong’s goal was to realize an injection molding machine that matches typical Japanese high standards in terms of performance, quality, stability, repeatability and reliability. And with the MK6, in the opinion of a former chief engineer at Japanese injection machine manufacturer Mitsubishi who currently works for Chen Hsong in the role of senior technical advisor, Chen Hsong has come “really, really close” in its effort.

Case in point: Executive Director and Group Chief Strategy Officer at Chen Hsong Stephen Chung says more than 1,000 MK6 machines are already operating in the field whereas they have so far only experienced a solitary field repair issue. “We hope to emulate Japanese injection machine suppliers whereby machine quality means after-sale service is to all intents and purposes no longer necessary,” adds Chung.

The new MK6 machines are also performing well in terms of part reject rates according to Chen Hsong. Processors have reported reject rates falling from the 5% experienced on machines supplied by other Chinese vendors to 1% and in some cases further to 0.1%.

About the Author(s)

Stephen Moore

Stephen has been with PlasticsToday and its preceding publications Modern Plastics and Injection Molding since 1992, throughout this time based in the Asia Pacific region, including stints in Japan, Australia, and his current location Singapore. His current beat focuses on automotive. Stephen is an avid folding bicycle rider, often taking his bike on overseas business trips, and is a proud dachshund owner.

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