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MOULDS | HOT RUNNERS


Above: I-mold has developed a range of space-saving tunnel gate inserts, fast high-precision servo motor drives for turntables and indexing plates as used in multi-component injection moulding


for rack and plate movements, sliders and core- pulling operations. The TG Series range of tunnel gate inserts that


support compact designs due to sharply curved feed channels are now available in a greater diversity of types to provide mould makers with matching solutions for every application task. Three sizes are available for shot weights up to 35 g (type I), 120 g (type 2) and 1,000 g (type 3), as well as between three (low, medium and high) feed channel outlet levels. With these nine different configurations it is possible to optimise the sprue-to-moulding volume ratio in applications involving large contour steps, mouldings with a peripheral rim, or interior contours located above the mould parting line. While the


low-level (LL) models are particularly suitable for gating below the parting surface, the high-level (HL) variety provides benefits in gating from the inside or above the parting line. Mouldings with a small peripheral rim are the preferred application domain of medium-level (ML) types. The company has also developed rotary motion solutions for multi-component injection moulding. The Servomold product range comprises servo drive units for turntables measuring up to 1.6 m in diameter, which rotate together with the entire mould mounted on them. I-mold says that it provides the power train rating and design – com- plete with servo motor, planetary gear unit, gear wheel or belt transmission and autonomous controller – that ensures fast rotation, for example through 180° in just 0.5 s while being optimally adapted to the large masses involved. The company also has a new series of single nozzles made by Heatlock. The devices are claimed to have a rugged nozzle tip and good temperature control. The single-shot nozzles are suitable for shot weights up to 800 g (with low-viscosity plastics) and for processing all types of engineering thermoplas- tics due to a uniform temperature distribution over their full length. MHS has launched cooling-free Black Box and


iVG hot runners for a new generation of valve gate systems that do not require maintenance during the life of the mould. The company says that these systems eliminate all quality issues related to cooling water such as corrosion and contamination. Less plumbing also simplifies the design and assembly of the mould. The company says that the new cooling-free technology can benefit all valve


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