Wittmann Battenfeld presented its injection moulding technology for LSR processing on two exhibits at DKT. With a multi-component machine from the servo-hydraulic SmartPower series, a SmartPower 120/130H/130S Combimould LSR, a mobile phone holder was manufactured from PC and LSR, using a 1+1 transfer mould with a needle shut-off cold runner supplied by Elmet, Austria. The machine was equipped with a W921 robot, a Tempro plus D2 140 dual-circuit temperature controller and an Aton plus 30 dryer, all from Wittmann, as well as a Top 5000P metering pump from Elmet. The LSR used from Momentive is Siloprene LSR 2759, a material characterised by excellent adhesion to the PC provided by Covestro. The material loading system for the thermoplastic component is geared to handling extremely small quantities, to avoid remoisturising after transport. Apart from their compact footprint and user-friendliness, the machines of this series stand out primarily by their intelligent and economical energy utilisation achieved by a fast-response, speed-controlled, air-cooled servo motor combined with a highly efficient constant displacement pump.
LSR processing in the area of micro parts was demonstrated by producing a support ring with a silicone membrane on a MicroPower 15/10H/10H Combimould LSR. This micro part, manufactured in a 2C process, is used in industrial measurement technology. The 8-cavity mould used to manufacture these parts was produced in cooperation with Nexus. The materials used are polycarbonate (Macrolon) supplied by Covestro and a self-adhesive LSR (Siloprene) from Momentive. The silicone membrane of the support ring, no more than 20 µm thick, makes it possible to transmit accurately even the most minute pressure variations between two different media. The LSR is fed to the machine from cartridges, the material flows are measured by a liquid dosing unit designed for quantities in the microliter range. Simultaneously, the high material quality is documented and transmitted to the machine’s B8 control system via an OPC-UA interface (Euromap 82.3). The Servomix X1 liquid dosing unit contributed by Nexus completes the package.