From November 13 to 16, 2023, WITTMANN BATTENFELD will demonstrate its expertise in the area of LSR processing at the Compamed in Düsseldorf by making a high-quality micro loudspeaker from thermoplastic and liquid silicone.
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Fig. 1: MicroPower 15/10H/10H Combimould with LSR dosing pump |
The membrane will be produced with a single-cavity mold supplied by Starlim Spritzguss, Austria, on a MicroPower 15/10H/10H Combimould specially designed for injection molding of micro parts. The machine is a multi-component model from the MicroPower series. The MicroPower to be exhibited at the Compamed comes equipped with a 2-step screw-and-plunger thermoplastic injection unit and a 2-step screw-and-plunger LSR aggregate, plus a rotary disk integrated in the machine. The latter enables subsequent rotation of the part towards the second injection unit and back. The machine is also laid out for clean room injection molding. Its rotary disk is completely encapsulated. All connections for heating, temperature sensors, water temperature control, pneumatic core pulls and relevant sensors, as well as the exhaust valve, are positioned next to the rotary disk. The closeness of the connections to the mold thus achieved enhances the machine’s operating comfort.
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Fig. 2: Membrane made of thermoplastic and liquid silicone for a high-quality micro loudspeaker, |
It is often necessary to build costly multi-cavity molds already at the prototyping stage for the sole purpose of reaching the necessary minimum throughput of the machine.
The choice of a single-cavity mold with this application serves to demonstrate the high precision of the mold in combination with the MicroPower machine, which is specially designed for the production of micro parts.
The LSR metering pump supplied by EMT Dosiertechnik, Germany, is a 1-liter cartridge system developed for extremely small metering volumes. Smooth, continuous emptying of the cartridges ensures highest precision together with consistent quality.
Another advantage is the blending section reduced to a minimum, with the special benefit of rapid cleaning and minimal material loss with every material changeover.
