Extrusion International 4-2021

41 Extrusion International 4/2021 battenfeld-cincinnati Germany GmbH (Bad Oeynhausen, Germany) www.battenfeld-cincinnati.com extruders, the perfectly processed melt passes through a fl at-sheet die into the multi-touch roll stack with 2,400-mm-wide rolls. Thanks to a combination of a two-roll stack for pre-calibration with several re-calibration rolls, which ensure even surface contact with the rolls, it produces excellent semi- fi nished product attributes, that is, optimal fl atnesswithnarrowthicknesstoler- ances.While theexcellent fl atness is important for further processing of the boards by thermoforming, the reduction of thickness tolerances means hard cash. With the modern line, Vestel has been able to reduce the thickness tolerance of its HIPS sheets by some 50 % compared to its existing lines equipped with con- ventional three-roll roll stacks. With a line output of 3,000 kg/h, this alone yields annual cost savings in six-digit euro fi gures. The overall concept, with its eco- logical as well as economic advan- tages due to reduced raw material consumption, has already been fa- vored by several other customers. For example, battenfeld-cincinnati recently installed a comparable ul- tra-modern sheet line for a German customer at its production plant in Poland. The specialty in this case is that the thickness range of the semi- fi nished products being made can vary from 1 to 6 mm, and a winder for sheet up to 2 mm thick- ness as well as a stacker for thicker boards are integrated. Complete extrusion line for the production of HIPS boards The globally active Turkish corpora- tion, which has been a member of the Zorlu Group since 1994, con- sists of 28 different companies and serves industries such as makers of consumer electronics, household appliances, mobile technology and LED lighting. The companies united under the roof of the Group in- clude famous brands such as Tele- funken, Graetz, Techwood, Finlux, Luxor and Vestfrost, as well as Hi- tachi, JVC and Toshiba. Vestel is the export champion of Turkey for 22 years in the electronics and home appliances industries through its exportation to 156 countries with a diversi fi ed product range based on technology and design develop- ment competency. ForitsplantinManisa/Turkey,Vestel Home Appliances, who can already look back on a long-standing busi- ness partnership with the German machine manufacturer battenfeld- cincinnati, most recently purchased a complete line to make HIPS sheet for door and interior compartment linings in refrigerators. A vital con- sideration for the white goods manufacturer was to have a pow- erful line with a high performance in terms of sheet quality. This is why the modern extrusion line with its 75-40 T6.1 and 45-32 T2.1 high- speed extruders and multi-touch roll stack was chosen. High-speed extruders from Bad Oeynhausen come with a very compact design and yield an enor- mous output with their high screw speeds of up to 1,500 rev/min. The melt’s residence time inside the ex- truder is long enough to achieve optimal homogenization on the one hand, and on the other hand short enough to prevent mechani- cal or thermal damage to the ma- terial. At Vestel Home Appliances’ Refrigerator Factories in Manisa, two size-75 high-speed extruders take care of plasticizing the core layer of the boards, which are up to 6 mm thick and up to 1,200 mm wide, while a co-extruder applies the glossy surface layer. From the Co-extrusion set up of the board line at the entrance of the Multi-Touch roll stack