processing feature | Materials handling Schenck has
found a way to reduce batch
feeding errors using its VKD software in its Disocont Tersus
controller
method to reduce batch feeding errors by up to 50% depending on the material and helix type. Liquid colour is increasingly being used by com-
pounders as well as by extruders and moulders of final parts. Maguire Products’ new liquid-colour pump, the patent-pending PeriStep, is claimed to provide 20% greater accuracy compared with standard volumetric pumps in dosing liquid colour directly into the main flow of natural resin. It includes a self-adjusting automatic speed control that maintains dosing consistency. For colour changes, the operator retracts the top
to 16 different materials. Brabender Technologie is well known for its
FlexWall feeders which feature a polyurethane hopper massaged by external paddles to ensure the accurate metering of hard to handle materials. Its latest addition to this range is the FlexWall 20 which is the smallest model in the line-up. It can deliver low feed rates of just a few kilograms per hour. For bulk ingredient metering at laboratory rates,
Maguire’s
PeriStep liquid- colour pump
has been devel- oped to provide greater accuracy
Brabender also offers the RotoTube Feeder, a miniature rotary tube feeder for pellets and granular ingredients, and the Brabender MiniTwin Feeder, one of the smallest twin screw metering feeders in the world. They can both feature new brushless DC motors with integrated speed controllers that help them to accurately meter ingredients at rates of a few grams per hour. The two feeders are available as volumetric units or as scale-mounted gravimetric feeders.
Schenck Process has developed a new method to
reduce batch feeding error rates by 50% using its VKD Software in its Disocont Tersus feeder controller. The process is known as bumping and it involves running a dry material feeder at full speed, stopping it prior to the batch set point and then having the controller bump the helix motor in a range anywhere from 100 millisecond to 100 second intervals until the batch is within the specified tolerance. Following this method of batching requires the disabling of the automatic adaption on the controller, which prevents it from changing the correction amount. By doing so, the controller can be stopped short of the batch set point and then bumped to the tolerance specified in the parameter. Lab testing has proven this
74 COMPOUNDING WORLD | February 2015
cover of the pump and lays a new tube over the rollers inside, without the requirement to work the tube into a compression zone. Tubing is reusable for up to six months and is available in three sizes to accommodate a range of dosing outputs. Instead of a standard motor, the drive system is a stepper motor with a shaft that rotates in discrete, minute increments that delivers precision and repeatability of movement. The motor drives a central “sun” roller and its
motion transfers to the “planetary” rollers that provide the compression-relaxation cycle of a peristaltic pump. Maguire has reduced the number of planetary rollers to four from the conventional six. The sun roller drives the planetary rollers by means of friction contact, providing a 5-to-1 speed reduction without a gear box. “The compact, streamlined design of the PeriStep pump lends itself to minimal mainte- nance, since there are no
gears or bearings to wear out,”
says Steve Maguire, president of Maguire Products. “If it does
become necessary to disassemble the pump, access to the roller set involves simply removing three screws in the cover.”
Click on the links for more information: ❙
www.coperion.com ❙
www.ktron.com ❙
www.bulk-solids.k-state.edu ❙
www.vortexvalves.com ❙
www.bulksolids.com.au (Tunra) ❙
www.gre.ac.uk/wolfsoncentre ❙
www.particulatesolidshandling.com (GCU) ❙
www.loadfastsystems.com ❙
www.flexicon.com ❙
www.nbe-inc.com ❙
www.motan-colortronic.com ❙
www.brabender-technologie.com ❙
www.schenckprocess.com ❙
www.maguire.com
www.compoundingworld.com
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