PETpla.net Insider 08 / 2017

MATERIALS / RECYCLING PET planet Insider Vol. 18 No. 08/17 www.petpla.net 28 Compact compressed air resin dryers easily combined with injection moulding machines Process optimisation cut and dried When the injection moulding manufacturer Boy put the Boy XS especially for small mouldings on the market in 2009, it was acknowledged that in the area of peripherals, and par- ticularly in terms of material dryers, there were hardly any suitable devices available on the market for drying small material throughputs. Due to the direct mounting on the feeder, remoistening of the treated material is avoided: It is a special solution with a very small material container that has been designed especially for the Boy devices. Too large, elaborate and com- plex dehumidification units in terms of handling, with inherently high operat- ing costs, did not offer a reasonable solution for smaller machines. That Together with FarragTech, Boy has developed another connection option – at the moment, however, this is only available for the Card G Fit series, because the Fit controller from Far- ragTech is required for that. is why in 2010, the choice fell to the small dehumidification units from the Card series of Austrian company Far- ragTech. Of special interest here was the compact design which made it possible to mount the dehumidification unit directly on the machine without affecting the small injection unit of the machine and without limiting acces- sibility. The dehumidification units run smoothly with the new machine soft- ware Procan Alpha 4 which Boy has developed specifically for its machines. A jointly developed bracket for the dehumidification unit offers the option of automatically conveying the dried resin using the shortest route into the small intermediate hopper on the plas- ticising unit. Here the filling level is monitored via a sensor, with the rede- livery switched from the dehumidifica- tion unit. The filling up of the dehu- midification unit can also take place automatically. Here, too, a sensor con- trols the suction of resin from a reser- voir which is placed near the machine. The filling level in the dehumidification unit can be optionally adjusted. Due to the compact design of the expan- sion dryer, the system just needs the footprint of the injection moulding machine. In addition, the ease of use of the drying system is striking. The few settings on the dryer are placed at an ergonomic working height. This is important, as high-quality techni- cal plastics, where water absorption cannot be prevented during transport and storage, are disproportionally often processed especially on small

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