Extrusion Asia Edition 1-2018

37 Extrusion Asia Edition 1/2018 片材生产线含MRS多螺杆挤出机，RSFgenius旋转过滤系统和 VIS在线粘度测试仪和PET 发泡模型 Sheet extrusion line with Multi Rotation Extruder MRS, Rotary Filtration System RSFgenius, Online Viscometer VIS and PET foam module 使用在经常切换材料方面的KF连续型过滤器 Continuous Rotary Filtration System KF 150 for frequent material changes 100 % post-consumer material. Foamed PET sheet is an ideal material for economically manufacturing thermoformed contai- ners for the food industry such as meat trays, egg cartons, cups or plates. Gneuss Rotary Filtration Systems The patented Rotary Filtration Systems are characterized by the filter disk on which the screen cavities are located in a ring pat- tern and which is completely encapsulated by the two filter blocks. Screens can be inserted into the cavities by opening a small hatch door giving access to the cavities while the produc- tion process continues to run without any interruptions or dis- turbances. All models have been completely revised in the last years. Mo- difications to the screen changer housings permit operation on a wider range of applications at higher pressures, whilst offer- ing enlarged active filtration areas. Components and modules have been commonised in order to offer shorter delivery lead times and lower costs. The SFXmagnus series operates automatically as well as process and pressure constant. It is suitable for a very wide range of ap- plications. This series is characterized by an extra large active screen surface area, its compact design, as well as extremely easy operation. Screen changes do not have any influence on the product quality. Gneuss’ top model, the RSFgenius, operates with an integrated self cleaning system for very demanding applications and highest quality requirements. Screens can be automatically re- used up to 400 times and filtration finenesses below 10 mi- crons/1200 mesh are available. Gneuss Processing Unit GPU The Gneuss Processing Unit (GPU) has been available for several years now and has proven itself for the reprocessing of bulky PET waste such as post-consumer bottle flake and industrial waste from fiber and film manufacture without pre-drying. A Gneuss Processing Unit consists of a Gneuss MRS extruder with its unmatched devolatilization and decontamination perfor- mance in combination with a highly-efficient Gneuss Rotary Fil- tration System and an online viscometer VIS for intelligent dy- namic viscosity control. Although originally developed specifically for PET, the MRS is now also running in polyolefin and nylon applications, and being tested on a range of other materials and applications. Thanks to the patented combination of single screw extruder with a multiple screw section, the extruder is very sturdy and particularly well suited for recycling applications. The MRS extruder permits the processing of PET without pre- drying by using a simple water ring vacuum system to process the material directly to high quality end products. This is achieved by means of its unique and patented processing sec- tion. Based on a conventional single screw extruder, the Multi Rotation Section is a drum containing eight satellite single screws, driven by a ring gear and pinion transmission. The “bar- rels” cut into the drum are approximately 30 % open and pro- vide optimum exposure of the melt. Thanks to this design, the devolatilizing performance is approx. fifty (50) times greater than that of a conventional single screw extruder – and this at a vacuum of only 25 to 40 mbar. By avoiding the need for a deep vacuum system and pre-drying, the MRS is an economically efficient alternative to conventional technologies. Further arguments in its favor besides energy sav- ings are the simple and rugged design, small footprint, its ease of operation and low maintenance, processing flexibility and last but not least its excellent melt quality and homogeneity. One area this technology has been especially successful is in PET sheet extrusion. Besides producing high quality rigid sheet, Gneuss now also offers the option for its PET sheet extrusion lines to quickly and flexibly switch to producing physically foamed PET sheet with the addition of Gneuss’ new PET foam module. Foam sheet with a weight reduction of 50 % can be extruded (depending on the process) with a consistent foam structure and mechanical properties. And this from up to