Extrusion International 6-2020

27 Extrusion International 6/2020 Changeover times related to mate- rial properties signi fi cantly can be reduced compared to conventional processes based on pre-drying tech- nology; hence the entire extrusion line can get operated far more fl ex- ible and signi fi cantly more ef fi cient. All BREYER extrusion lines process- ing high quality PC, PMMA and PETG sheet or even fi lms for optical ap- plication do follow the undried and vented process. The melt will become optimally degassed, a precondition for the production of fi rst class sheet and fi lms meeting highest quality de- mands of the worldwide market. One calender for 3 types of sheet surface To serve to the whole market the product line is able to produce three different kinds of sheet: mat and structured sheet as well as both side polished sheet with optical proper- ties. Thanks of the quick-exchange-device of the fi rst and center calender roll, themachine can be fast converted for different types of sheet. In this way the machine becomes highly fl exible. thickness, and within a matter of sec- onds the product is set to the desired thickness. This is a clear advantage in terms of time and costs compared with conventional gap adjustment systems, which require the operator to adjust the speed separately, after the gap adjustments have been im- plemented. BREYERoffers the complete extrusion system including gravimetric dosing systems, side-trim saws and cross-cut saws as well as stacking systems. The entire control system is according the latest standard, and the BREYER e-Portal offers different online sup- port solutions for the operator. All these features described make the BREYER extrusion line a real mul- tifunctional tool and enable the op- erator to set up an economical and fl exible sheet production. Breyer GmbHMaschinenfabrik Georg-Fischer-Str. 40, 78224 Singen, Germany www.breyer-extr.com Depending from the total output (kg/h) the calenders with three and four rolls with different roll diam- eters are available. Quick adjusting the fl atness Flatness of the sheet is essential. By the BREYER calender with its slew- able third calender roll is not any- more a matter of many minutes. By this feature the residential time of the sheet around the center calen- der roll is in fl uenced. During running condition the position of the third roll in relation to the center roll can be changed, resp. adjusted exactly to this position where top and lower side cooling is balanced and the fi lm becomes fl at. Changing quick from one thickness to another The BREYER gap control system al- lows a precise and fast adjustment of the gap, simply by changing the extrusion speed at the touchscreen (pressure control mode) especially for thinner sheet. The operator changes the speed value on the touch screen in accordance with the new product