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HOT RUNNERS | MOULDS


to be located rapidly and contains illustrated instructions for its rectification. New safety couplings Z80700HT and Z80801HT have also been introduced for improved mould temperature control, where an automatic safety lock protects against unintended unlocking. Hasco says that the forced rotating guide on the locking sleeve still ensures easy decoupling. For safety reasons, a deliberate unlocking movement must be per- formed each time. This effectively prevents acciden- tal or unintended unlocking. A visible green colour coding behind the locking sleeve clearly indicates correct and safe coupling. The new safety couplings are ideal for heating and cooling applications with cold or hot water or heating/cooling oil, with high-temperature sealing rings permitting maxi- mum load. They are compatible with Hasco cooling systems, available in diameters of 9 and 13 mm, either with locking or a free throughput, and equipped with a connecting thread or hose nozzle. To achieve maximum safety, it is recommended that hydraulically pressed hoses be used. Positive locking cylinders are used in injection moulds to operate valves, cores and similar components. For high- temperature applications in compression and injection mould- ing tools up to 180°C, Hasco has introduced the positive locking cylinder Z2302, with mechanical final position sensing. The solid design of the new positive locking cylinder and the precise final position sensing via proximity switches permits safe locking of the piston rod and is suitable for use with core pullers and mould slides. Service tempera- tures of up to 180°C are possible. The positive locking cylinder has optimised gaskets and is easy to mount. The integrated positive locking means there is no need for a locking device on the mould. The cylinder is mounted either with the Hasco flange Z2310 or the Hasco groove-nut set Z2311, which helps with fine setting. Hasco has also developed the A5850 status


indicator for injection moulds. The company says that it can be easily adjusted by hand, via a knurled wheel, without any tools. In a readily visible window, a clear colour code shows the current mould status on a roll with four colours. Green means an enabled mould, yellow shows that the mould is due for maintenance, red that the mould is locked and blue signifies sampling. The status indicator can be


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positioned as required and is fixed in place by screws or a magnet, and can also be mounted vertically on narrow plates. It can be employed at service temperatures of up 100°C, is individual and versatile in use and also easily dismantled for cleaning, says the company. Sipa has recently developed a high cavitation hot runner system – a preform mould with 192 cavities – for a leading PET container maker, based in North America. The company says that its Xflow melt distribu- tion system, which is now available for use on GEN 3 (third generation) XFORM 350 and 500 high-performance injection moulding machines,


creates a hot runner system that consistently and reliably enables many cavities to be filled identi- cally, at high speed and without excessive force. The new system incorporates a hot runner manifold design that provides a good balance of melt distribution and exhibits a low pressure drop. This allows a significant extension of the maintenance interval, since wear and tear is reduced, and is claimed to be easy to carry out.


The company adds that Xflow technol-


ogy allows the creation of high cavitation systems without having to compromise on balance, pressure losses, and the formation of acetaldehyde due to polymer degradation. Xflow can also be applied to moulds with more modest levels of cavitation. According to Sipa, the Xflow solution applies advanced concepts of polymer fluid dynamics to hot runner engineering. By taking melt rheology aspects into account, it is possible to halve the imbalance in melt flow compared with first generation systems. Third generation hot runner systems now incorporate a version of Xflow that benefits from a total overhaul of the cylinder


November/December 2018 | INJECTION WORLD 37


Above: The H1280 series of control units from Hasco has high function- ality and comprehensive diagnostics


Left: Sipa has recently


developed a high cavitation hot runner system: a preform mould with 192 cavities


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