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processing feature | Pellet screening

Allgaier’s tumbler

screening machines

provide very high screening efficiencies

unit is integrated into the separator, reducing the installation height requirement and saving additional costs for the customer. It also simplifies the retrofitting of HFS units to existing installations, for example between compound- ing extruders and bagging units. The horizontal fluid-bed

separators do not contain any moving parts, providing high reliability and low maintenance requirements. They can also be cleaned simply and quickly. Coperion says that the HFS’s low product velocity

(below 1 m/s), along with its fluid-bed approach, provides gentle cleaning and therefore prevents breakage in fragile materials and abnormal wear levels. It also allows rubbery pellets to pass through without excessive bouncing. One customer in Germany is using an HFS-3 on a

new line for producing high-purity PMMA, which started operation in 2011. It separates dust from the pellets upstream from the extruder. Another Coperion client in Saudi Arabia is using a special HFS 20S that was developed to handle PET at up to 35 tonnes/h. ❙

Coperion’s HFS horizontal fluid-bed separator offer excellent fines separation performance

Erimaki of Italy has recently added a rectangular model to its Vibroscreen range of separators. It joins the company’s established circular designs which are offered with screen diameters from 400 to 2,200 mm and with one to four separation stages for delivering two to five product fractions. ❙

GKM Siebtechnik of Germany produces a range of screening systems including tumbler and vibrating designs. It has recently appointed Kemutec of the USA as its exclusive distributor of these flat-deck screeners for the north American market. Kemutec will sell the machines alongside its existing Kek centrifugal sifter

range. GKM’s Ultimate Tumbler Screeners

use a three-dimensional screen move-

ment for efficient separation. They are offered with diameters from 600 to 2,600 mm and up to six screen decks per machine. The company’s Vibrating Control Screeners provide

extremely fast centre discharge of fine particles and adjustable retention time for oversize particles. They are produced with diameters from 450 to 2,000 mm and with one or two decks. ❙

Gough Engineering of the UK has developed its Vibrecon Pellet Screen for the efficient removal of misshapen longs and angel hair from plastics pellets. A circular deck made from stainless steel is vibrated gently to provide the required separation. A second lower deck with a woven wire mesh can be added if required to remove dust and fines. The Vibrecon Pellet Screen is available in five sizes covering capacities from 300 to 6,000 kg/h. The company also offers Vibrecon screeners with

ultrasonic technology which can be useful for screening very fine powders, including pigments. The ultrasonic vibration superimposes an additional oscillating motion on the screen which reduces the friction between the fabric of the screen and the bulk material. It can also help to break down agglomerates more quickly. Gough can custom make designs to meet specific

requirements. For example, it produced a direct-drive low-lying Vibrecon GV4/2 separator to meet the exact needs of a Malaysian masterbatch manufacturer. It screens plastic pellets at 2,000 kg/h. ❙

Kason of the USA offers a wide range of vibratory and centrifugal screeners as well as drying and cooling systems. Its latest developments in vibratory classifiers that can be used for screening pellets include its largest ever model, plus a low-profile design with reduced headroom requirements.



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