MACHINERY | GRANULATORS
The new series is designed to obtain homoge-
neous regrind shape and dimensions, along with little to no presence of dust. One benefit of the new line is the ability to produce regrind with very small dimensions – which has no adverse impact on the quality of the finished medical product. Small capacity systems, including injection moulding machines and extruders, are equipped with small diameter plastification screws that cannot process granules with dimensions exceeding those of virgin granules. The G17-MED granulators produce regrind that is dimensionally comparable to the virgin pellet, says CMG. The company has also developed a new cutting chamber for its Evoluzione series, in which a new rotor configuration allows rotating blades to cut material perpendicularly against fixed blades. The blades are mounted directly on the end of the support bracket, which facilitates high inclina- tion of the blades and allows for easy and quick maintenance and replacement as the cutting chamber is accessible from the front of the ma- chine. The material does not rotate with the rotor, avoiding the dust and small particles that become waste material in the washing phase. The produc-
tion of micro particles is reduced to a few percent- age points, compared to 15% or more with a conventional granulator, says CMG. The open rotor design occupies 30% of the space inside the cutting chamber and the ratio between the volume of the rotor and the cutting chamber is 30/70, while that of conventional granulators is 70/30. The cutting chamber also benefits from tangential development, guarantee- ing smooth material ingestion without resorting to forced feeding systems.
Improved cutting
Austrian injection moulding and thermoforming specialist Lechner recently linked up with consult- ants from Büchler – which represents granulator manufacturer Getecha in Austria and Hungary. Project manager Bernhard Lechner explained:
“To optimise internal material processing in the two halls at our main factory in Bad Vöslau, we needed multiple standard granulators for efficient granula- tion of various scrap material from component manufacture and film processing. After require- ment analysis, we selected two granulators of the RotoSchneider generation: a type RS 45090
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