Wittmann Battenfeld will Demonstrate its Expertise in Liquid Silicone Processing at Compamed in Düsseldorf
At the Compamed, the international trade fair for medical suppliers and product developers held in Düsseldorf, Wittmann Battenfeld will demonstrate its expertise in liquid silicone processing by manufacturing a membrane made of thermoplastic and liquid silicone for a high-quality micro loudspeaker.
The membrane is manufactured on a MicroPower15/10H/10H Combimould with a single-cavity mould supplied by Starlim Spritzguss GmbH, Austria. The machine is a MicroPower in a multi-component version. It is equipped with a 2-step screw-and-plunger thermoplastic aggregate, a 2-step screw-and-plunger LSR aggregate, and a rotary table integrated into the machine. The rotary table takes care of turning the part towards the second injection unit and back.
The machine is also laid out for clean-room injection moulding. Its rotary table is completely encapsulated. All connections for heating aggregates, temperature sensors, water tempering, core pull pneumatics, and sensors, as well as the blow-through valve, are installed close to the rotary disk. The resulting short connection lines to the mould enhance the machine’s user-friendliness.
The choice of a single-cavity mould demonstrates the high precision of the mould in combination with the machine, which is specially designed for the production of micro parts. It is often necessary to build costly multi-cavity moulds already at the prototyping stage for the sole purpose of reaching the actual minimum throughput of the machine.
The LSR metering pump supplied by EMT Dosiertechnik, Germany, is a 1-liter cartridge system developed for tiny metering volumes. Smooth, continuous emptying of the cartridges ensures the highest precision and consistent quality. Another advantage is the blending section is reduced to a minimum, with the special benefit of rapid cleaning and minimal material loss with every material changeover.
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