INNOVATION | LIQUID SILICONE RUBBER
moulding by demonstrating production of a microswitch cap weighing just 0.009g. The com- pany developed the production process for the microswitch cap – used in various applications in healthcare and other industries – with Arburg. In the demonstration an electric Allrounder 270A machine with a clamping force of 350 kN was used, equipped with a size 5 microinjection unit and a Rico 8-cavity mould. During the process, Wacker’s Elastosil LR3005 LSR with a Shore A hardness of 40 was pre-mixed using a cartridge and then injected using an 8mm screw.
Above: Injection moulding of an LSR microswitch cap by Rico
ment is right for its use. The processor should also ask where the cost reductions will be across the whole value chain. Would multi-shot result in increased profits? This applies not just to the processor, but also to its customer asking the question “What’s in it for me?” Landl also recommended that the processor considers risk minimisation when starting multi-shot moulding. “You need experienced partners in LSR. You have to choose your partners wisely,” he said. At K2019, Rico showed its expertise in LSR
Rico said the LSR was injected directly into each cavity using a mini valve gate nozzle, leading to waste-free production. An Arburg Multilift H 3+1 robot was used for handling. A camera monitored whether each cavity is filled during the process, and whether all parts were correctly removed by the gripper. The company said this ensures that the injection mould is protected against damage and that the right number of parts are removed. Defects can also be spotted in individual components, which are then separated from the parts that meet the specifications. Trelleborg is another specialist LSR processor. At
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Dr. Boy GmbH & Co. KG +49(0)2683 307-0
info@dr-boy.de www.dr-boy.de
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LR 5
BOY – Handling
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Modular & Flexible
• Ideal solution for part removal and part insertion • Servo linear main axes with repeatability of +/- 0.1 mm • Pneumatic swivel (C-axis), optional rotational axis (B-axis) • Integrated solution with the BOY injection molding machine • Adaption of downstream and turnkey solutions possible
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IMAGE: RICO
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