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April 19, 2010 02:00 AM

Arburg launches a micromolding system

David Vink
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    German injection molding machine producer Arburg GmbH + Co. KG has launched a new add-on injection unit for micromolding.

    Rather than the screw-and-plunger combinations used by some rivals, the new Arburg module uses two screws. Initial plasticizing is carried out using a three-zone plasticizing screw while final metering and injection is carried out in a second servo-electric-drive 8-millimeter-diameter screw with a non-return valve.

    The pre-plasticization screw has an almost conventional flight design, and is mounted piggyback-style at 45 degrees. It is used simply to melt the plastic material prior to delivery to the 8mm injection screw. The latter has purely a material-transport function.

    Arburg said this technique enables extremely small parts to be molded with standard-size granulates, making the use of specially prepared micro-granulates unnecessary. Micro-granulate is usually required on micromolding machines with screw diameters below 15mm, according to Lossburg-based Arburg.

    The use of a screw rather than a plunger also has a benefit in terms of quality, according to technical director Herbert Kraibuhler, as the polymer material is injected on a “first-in/first-out” basis. This means there is a reduced risk of contamination of moldings due to extended melt residence times, which can lead to black-speck development, Kraibuhler said.

    Arburg demonstrated the module running on a standard 35-metric-ton all-electric Allrounder 270A Alldrive at the company's recent Technology Days open house in Lossburg.

    An Arburg Multilift H robot was used to remove the 1.58mm-diameter, 0.001-gram micro-gearwheels, while a special pneumatically driven gripper system applied pneumatic force to remove the parts from an eight-cavity mold from Stamm AG in Hallau, Switzerland.

    The mold and parts were the same as those run on a 15-metric-ton hydraulic-drive Allrounder 170S, equipped with a size 30 injection unit and 12mm-diameter screw, at the 2009 Technology Days. That machine also was running at the 2010 open house, this time producing micro “shift gates” weighing 0.0025 gram.

    Copyright 2010 Crain Communications Inc. All Rights Reserved.

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