Technical Moulding: Efficient use of LIM multi-component processesThe 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. An Engel e-victory 200H/80W/120 combi injection moulding machine – automated with an Engel viper 20 linear robot – will impressively show that Engel system solutions not only meet these requirements fully, but also handle 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. "We can guarantee maximum precision by using servo-powered injection units," says Leopold Praher, head of sales for elast/LIM machines at Engel Austria. "Normally the LSR field requires special solutions where very small injection unit volumes are involved. In this case we meet 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 Engel e-victory 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.