processing feature | Materials handling
This transpar- ent model of Pelletron’s
Pellbow shows how it cushions material from impact
able as either volumetric or gravimetric systems, they have brushless DC motors and are reportedly capable of rates down to a few grams per hour. New for production applications is the DDSR40B
twin-screw feeder, another unit that can be volumetric or gravimetric in operation. Folkl says the model is designed for hard-to-flow materials. Features include an outsized material inlet, hoppers with straight or steeply slanted walls and a stirring agitator for accurate metering. Throughput rates, depending on material and screw type (there are four options) range to 2,700 dm3 (95 ft3
) per hour. The unit is engineered for easy
disassembly; feed screws are interchangeable; and material-contact parts are made of stainless steel.
Going round the bend Pipe bends, whether long or short, pose problems in conveying systems. The bends or elbows promote high-velocity transfer of pellets, granules and abrasive materials, but also generate centrifugal force that pushes these ingredients against interior metal surfaces. This creates friction, which can affect material integrity and thus quality through the development of fines, streamers and other flaws caused by high-speed contact with inner elbow surfaces. Pelletron developed its Pellbow pipe elbow to help
Moretto’s KruiseKontrol system regulates the conveying speed accord- ing to the type of material
overcome the problem. Each elbow has an “impact zone”, which is a pocket in the bend of the attachment. Incoming material slows and builds up in the pocket then gradually reaccelerates through 90˚ into the next section of pipe with minimum resistance and no impact damage, the company says. The elbows come in different sizes and metals and
attach to pipes with various fittings. They are self- cleaning, generate minimal pressure drops and reduce conveying noise. Vactec addresses the problem with RaBend pneu- matic conveying bends. These bolt-on attachments use a
proprietary geometry in the form of a right angle that juts out slightly from the bend to eliminate the impact zone in long-radius elbows. Material builds up in this angled section during conveying and functions as a cushion. As material is conveyed through the bend it impacts on itself rather than the interior metal surface. The company says this reduces fines and surface abrasion. Another approach to maintaining product integrity is KruiseKontrol from Moretto. This touchscreen control regulates the vacuum conveying speed of pellets and granules from silos to one or multiple machine feeding hoppers. An operator enters the type of material to be conveyed and the number of extrusion lines that will get material. KruiseKontrol analyzes this data and opti- mizes transport parameters. Moretto says that by regulating velocity this way, angel hair, fines and other quality problems are eliminated. Compounders can expect to see developments, whether incremental or groundbreaking, continue in materials handling, and with them opportunities to improve the quality, productivity and profitability of operations.
Click on the links for more information: ❙
www.azo.com ❙
www.brabender-technologie.com ❙
www.coperion.com ❙
www.kraussmaffei.com ❙
www.ktron.com ❙
www.leistritz.com ❙
www.maguire.com ❙
www.moretto.com ❙
www.motan-colortronic.com ❙
www.pelletroncorp.com ❙
www.vactecllc.com ❙
www.zeppelin-systems.com
48 COMPOUNDING WORLD | February 2014
www.compoundingworld.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66
