Taking part in the K 2013 with a wide exhibition area, Bandera (stand C06, hall 17) is introducing an innovative coextrusion line for 5-layer blown film. It consists in a modern line suitable for the extrusion of white and black film with symmetrical structure, with PA or EVOH barrier in the middle layer, and also for lamination and flexible packaging. In addition, an innovative coextrusion line for PET/PP rigid foil is being tested from October 7 to November 8 at the new R&D department of the company in Busto Arsizio, near Varese (Italy). During the K exhibition, there is a video connection between the company's R&D area and the booth at the show, allowing visitors to watch live the machine production line while working.
The line ensures a thickness range from 150 to 1,000 micron for PET foil and from 280 to 1,800 micron for PP/PS foil, a 1,540 mm (770 mm x 2) net width of the foil and a total output of 1,500 kg/h (PET), 1,100 kg/h (PS) and 1,000 kg/h (PP). In detail, the line is equipped with a gravimetric "loss in weight" dosing system, with the possibility to work up to 6 components fed by a suitable handling conveying system. A corotating twin screw extruder, type HVTSE 2C105mm 52D, allows the direct extrusion of post-consumer regrind PET flakes without dehumidification and crystallization, induced by an efficient degassing system. It is set up for the installation of side feeders for external mineral fillers.
A 2C55mm 52D corotating twin screw extruder permits the extrusion of virgin/regrind PET for the external layers of the foil. A backflush superfiltration screenchanger has been installed to ensure continuous self-cleaning. A melt pump provides constant pressure and volume of the melt to the extrusion die, reducing scraps and improving the management of the whole process. The width of the foil and the relative feed block and selector plug can be easily and quickly reduced thanks to a single manifold flat die with manual internal deckling systems.
Cooling and polishing roll stack calender with horizontal configuration, drilled rolls and cross-axis system installed on the first calender nip allow to obtain the perfect foil profile even with very low foil thicknesses. A cleaning system efficiently cleans the middle roll of the calender through a contact sliding (motorized) trolley installed on a transversal rail. A rubber contact roll laminates the barrier film directly in the calender, and a control system monitors the thickness and width of the foil. A haul off system and a longitudinal cutting system by motorized blade and counter-blade have been adopted for the edge trims of the foil and to obtain multi-reels on the same shaft.
The fully automatic winding system features double stations. The winder is equipped with an automatic transversal foil cutting device and an automatic foil threading system for carton cores. A semi-automatic trolley carries out the reel discharge by load cell. The system is equipped with accumulator double rack to slow down line speed during the changeover of the reels.
Wiring is noticeably reduced, making the electric and electronic maintenance easier. The extrusion line is controlled by a computerized system that allows a centralized management of all production and operation parameters.  The operator interface is realized through an industrial PC with high definition colour display and touchscreen drives. The line supervision system can be easily interfaced with the user's company network, for remote visualization and production data export. A modem Ewon allows the user to be connected to tele-service, in order to get a timely and effective technical support.