Extrusion 8-2017

79 Extrusion 8/2017 Davis-Standard, LLC www.davis-standard.com/windingunwinding “The ironing roll winder offers a solu- tion to a common problem while also improving product quality and profita- bility,” said Danis Roy, Davis-Standard’s Vice President of Sales, Cast Film and Coating Systems. “Current markets dictate processing of these films at slower production speeds and to limited diameters in order to pro- duce defect-free wound rolls. We have experienced excellent results with this new winder in the field.” Larger diameter master rolls significantly improve subsequent processing efficien- cy. A relatively small increase in diameter can significantly increase the film length on a roll. This reduces downtime in slitter re-winding as well as batch process like vacuum metallization. The downside of winding larger roll diameters is the in- creased risk of in-wound defects. The variable geometry of the ironing roll en- ... modernizes High-Speed Winding of Large Diameter Master Rolls Davis-Standard introduces a new iron- ing roll winder that supports markets for larger diameter master rolls up to 1.2 m (4 feet) in diameter on cast film lines up to 6 m (20 feet) wide. This technology can be used for many film types, but Davis-Standard has found it to be most beneficial for CPP and barrier films where post wrap shrinkage occurs as a result of the types of polymers used in the film structures, or where blocking can occur due to a soft sealant layer with a high coefficient of friction (COF). The winder incorporates programmable tension control, pre-spreading onto the winding roll, and servo-controlled web entry of the film to influence leveling or lay-flat of the film prior to the lay-on roll. Roll hardness is improved with a more precise loading force of the lay-on roll against the winding roll, controlling the in-wound air at higher production speeds than previously possible. When optimized these features can reduce de- fects such as tin-canning, caused by blocking and entrapped air, and resulting in annular raised bands on the roll face. Other defects such as buckling, telescop- ing, and starring can also be reduced with the control features and dynamics of the new winding system. New Ironing Roll Winder ... ables processors to pre-wrap the film on- to the winding roll prior to the lay-on roll, allowing entrapped air to reduce the COF between each wrap. This promotes film flatness prior to engaging roll hard- ness with the lay-on roll. This results in improved control, preventing in-wound imperfections. The winder is available with a tapeless static knife or patented stationary knife automatic transfer sys- tems, and shafted or shaftless operation to further support efficiency. Although the winder is primarily designed for large master roll winding, in-line slitting is also possible in some shafted applications. Davis-Standard’s new ironing roll winder helps prevent in-wound imperfections on large diameter master rolls for films such as CPP Biggest Hot/Cold Mixing Combination in Mixing History tisfy every single customer request and guarantee long-lasting performance and longevity of the systems. This attitude let Promixon win a key bid for the manufac- ture of the biggest single mixing plant ever produced in mixing history. Destined to LVT production and 100% made in Ita- ly, the XBLEND-MC/2500/8600 is compo- sed by the High Speed Heating Mixer mo- del XM-2500 and the High Efficiency Ho- rizontal Cooler XC-8600. The complete plant has been delivered and successfully started-up at a major U.S.A. company. High efficiency production results: Working at 8500 hr/year, this huge mix- In recent years, the flooring market has shown a strong increase in LVT – Luxury Vinyl Tile – demand worldwide, thanks to its advantages in relation to durability and minimal maintenance re- quirements. The Italian company PROMIXON, specia- lized in the manufacture of mixing plants for Plastics and Powder Coatings, has heavily invested in product development and strengthened its supply with high technology improvements in several fields, also for flooring application (WPC, LVT, etc.). These upgrades are supplied with customized solutions, in order to sa- ing system of nearly 12000 kg weight has been completely customized to variable filling level and to process a wide range of formulations, always oriented to the reduction of mixing times and opti- mizing energy consumption. This “mons- ter” is producing 1200 kg/batch of PVC dry-blend at a rate of 8 batch/hr = 9600 kg/hr output. Furthermore, the cooler is specially engineered to receive up to 1500 kg of CaCo 3 filler each batch mixing it with the dry-blend during cool- ing, a special featured stirrer to ensure the optimum dispersion while cooling the batch.