The main demands as regards the processing of liquid silicone (LSR) are that it must be fully automatic, waste-free, low in burrs and require no reworking. A combi injection moulding machine (e-victory 200H/80W/120) automated with linear robot (Viper 20) will show that this system solutions does not only meet these requirements fully, but also handles LIM multi-component processes securely and efficiently.

A mould provided by ACH solution (Fischlham, Austria) will be used to produce sensor housings for flow measurement with integrated seals. The machine maker can guarantee maximum precision by using servo-powered injection units. Normally the LSR field requires special solutions where very small injection unit volumes are involved. In this case machine maker meets that need with a standard unit. Developed and patented by Engel, iQ weight control software applied in the system recognises and automatically compensates for fluctuations in melt quantity during the actual injection process.

The tie-bar-less technology of the injection moulding machine also makes a decisive contribution to high process stability in this application, while the patented force divider evenly introduces force to the mould across the platen face. Both outer and inner cavities are thereby kept closed with precisely identical force, significantly reducing mould wear and raising product quality. On top of this, free access to the tie-bar-less machine‘s mould area facilitates the most effective automation concepts.

Non rubber applications at the fair
Furthermore Engel will show off two more applications: Production of 500 ml food containers on an all-electric injection moulding machine (e-motion 440/160) featuring a 2-cavity mould by Glaroform (Näfels, Switzerland). In-mould labelling (IML) will be used to decorate the packaging; to do this, the machine maker will collaborate with partner company BECK automation (Oberengstringen, Switzerland). The third application will an example of a medical technology: An all-electric e injection moulding machine (mac 440/100) will manufacture polystyrene needle holders for safety hypodermics using a 16-cavity precision mould by Fostag, Stein am Rhein, Switzerland.