Extrusion International 4-2017

27 Extrusion International 4/2017 Coating technology on rigid films: a challenge revisited More than a decade ago, Bandera supplied a couple of rigid filmextrusion lines with integrated extrusion-coating systems to an important EuropeanCustomer. This representedachallenge, since equipment design and manufacturing were customized and subsequent experimentation was carried out to attain the line performances expected by the Customer for his specific application. This experience was an enrichment and laid the basis for future supply of such type of technology to other important producers, i.e.: previously well-established Bandera Customers for standard extrusion equipment, whowere fully confident to have Bandera walk aside them even when facing their more complex new endeavors. Throughout these years, Bandera has continued to ex- periment, in cooperation with its customers, to refine this technology for new performances, to make it suitable to fulfil different requirements, gaining ground in innovative fields. Bandera’s latest achievement in the sector: an important international player, again a well-established Bandera cus- tomer for both standard and specialized extrusion equip- ment, with wide concerns in the market, decided to renew their fellowship with Bandera. This customer awarded Bandera an order for the supply of a turnkey, High-tech Multilayer PET Rigid Film/ Sheet Extrusion Line for the pro- duction of thermoformed packaging products. The line integrates an Extrusion Coating Section for the production of barrier film for direct application to extruded PET sheet. This out-of-standard line, foreseen for an output of 2000 Kg/h, installs nine extruders: - Three extruders for PET sheet production, one of which a co-rotating twin screw extruder, Bandera patented, fit to process PET regrind, equipped with volumetric melt pump and superfiltration screen changer, for higher purification; two single-screw co-extruders for the outer virgin material skin layers; - Six smaller-size extruders, for barrier film production, representing the core of this hi-tech line, i.e: the extrusion coating section. These extruders are equipped with raw material handling/ conveying and gravimetric dosing sys- tems, manual screen-changers, automatic single manifold flat extrusion die, chill roll group, haul-off silicone coating and drying device and an alternative oxy-dry group. The line further includes the following main equipment: - automatic flat extrusion die; - cooling and polishing calender roll stack, with cross axis system to process even ultrathin sheets, equipped with in- line barrier film lamination system; - thickness control system; - semi-automatic cantilever winding system, capable of winding up to 3 reels on the same shaft, It is self-evident that an increasing number of customers, who have selected Bandera for their standard extrusion re- quirements throughout these years, are confident in trust- ing Bandera also with their more complex requirements. This reaffirms that at Bandera tradition and dedication to research for excellence and innovation move on parallel lines. COSTRUZIONI MECCANICHE LUIGI BANDERA SpA www.luigibandera.com FILM EXTRUSION