Hall 9 | Booth B56
Austrian company MAS – Machinen- und Anlagenbau Schulz is a supplier of conical twin screw extruder with co-rotating screws. At the K 2013, the company will present the MAS 93 as the largest model of the unique conical twin-screw extruder series with co-rotating screws.
The central exhibit at the MAS-booth will be the largest MAS twin screw extruder. It will be presented in combination with a CDF-500-D filter unit, the largest continuously working filter unit on the market. The illustration shows a complete cascade extrusion-unit, but the second extrusion-step will not be on display for reasons of space. (photo: MAS)
The combination of a conical cylinder and screws, rotating in the same direction offers special application advantages especially for the processing of materials with low bulk density, and materials that are sensitive to shear and heat. The reason is the large feed opening, a feature of the MAS extruder. It provides for a comparatively high screw filling level and a correspondingly high material throughput per screw rotation. The resulting advantages are the high output and the low shear-stress at low screw rotation speed. In addition, the MAS extruder is well suited for the processing of each shear sensitive regrinds or virgin materials, especially PET- or PLA-bottle regrind, but also PP or PE-film flakes with a bulk density down to 50 kg/m³. There is no need for a previous compaction through agglomeration. The MAS extrusion system is suitable not only as a recycling machine but also for the simultaneous compounding by addition of additives and/or fillers.
The conical co-rotating twin extruder are currently available in a range comprising the models MAS 45, 55, 55-L, 75, 90 and 93 for an output range between 200 and 2,000kg/h.
Starting with the K 2013, the extruder series is extended to the lower end adding the MAS type 24. The MAS 24 is the laboratory version of the conical co-rotating twin screw extruder. It was developed for recipe development and practical processing tests. Its conical screws are 400mm long, tapering within this distance from 48 to 24mm diameter at the discharge side and are equipped similarly to the larger types with interchangeable mixing elements. The screw speed can be adjusted between 0 and 300r/min.
In conjunction with the MAS 93-extruder on display, MAS will be introducing the largest continuously working melt filter currently on the market, with the type designation CDF 500-D. The MAS filters are now available in four sizes for material throughputs of 300 to 700kg/h. Above that ranks the CDF 300-D, the “twin model” with two parallel 300mm filter modules and a possible material throughput between 700 and 1,600kg/h. It is complemented by the type CDF 500 with a filter diameter of 510 mm and also 700-1,600kg/h material throughput. The new and largest model is the CDF type 500-D. It is designed with two parallel 510mm filter units. This provides an active filter area of considerable 3,650cm², which allows a material throughput from 1,300 to 2,000kg/h.
The CDF 500-D filtration system uses two parallel filters, each with 510mm diameter discs. It is compact and flexible.
The functional principle of the MAS filter is the patented continuous disk-filter system (CDF). There is a rotating filtration disc, made of hardened steel, in the melt flow. It is provided with a grid of through holes. Depending on the degree of contamination, of the melt properties and quality requirements, particles with diameters ranging from 0.13 to 0.75mm (130-750µm) can be separated. The filter is effective with impurities such as paper, wood, aluminium, rubber, but also non-molten foreign plastics. To ensure the continuous operation of the disc filter, the rotary filter disk is combined with a stationary, radially positioned doctor unit. It is pressed against the filter unit. The contaminants thus collected from the filter disk are continuously discharged to the outside by a subsequent discharge screw.
www.mas-austria.com
