Extrusion 1-2018

60 kompakt Extrusion 1/2018 Davis-Standard, LLC www.davis-standard.com into the granulator regardless of line speed or film thickness. Motor-driven web support rollers with an air-venting finish improve film transport at high line speeds, providing quality winding and wound roll formation. The air-venting id- ler roll finish locks film on the rolls at low tension for excellent tracking and roll edge straightness. In addition to system components, an over-the-line mezzanine accommodates a smaller footprint, while also enabling safe servicing of the extruders, screen changers, melt pipes and associated con- trol systems. With the unique “through- the-mezzanine feedblock riser,” there is safe and convenient access to the selec- tor plug for layer-sequencing changes. Davis-Standard has engineered a stretch film line that redefines modular efficiency for high-grade film operations. Installed in early 2017 for a large-scale North American film producer, this tech- nology is the new standard for stretch film line configurations due to multiple operator and production advantages. These include a compact machine ar- rangement, ease of operation and servic- ing, excellent profile control, consistent roll quality and an intuitive control pa- ckage. The system is engineered for producing thin films from 31-to 51-gauge (7.8µ to 13µ) at high speeds. Davis-Standard’s side-by-side DS S3 overlapping winder is essential to this capability. The S3 winder enables maximum slit widths for hand- wrap, machine-wrap and jumbo rolls, supporting multiple market segments on one winder. Films discharge out the front of the line to a common side to simplify roll packing and future automation. Cores are also same-side loaded from the back to prevent disruption of pa- cking activities. There is an auxiliary lay- on roll to eliminate top-wind waste dur- ing transfer, optimizing roll quality and eliminating outer wrap transfer waste. High-volume core bins minimize refilling frequency and feature a simultaneous core set discharge of multiple core lengths while also decreasing cycle time, improving slit-width flexibility and net film utilization. Core widths can be changed on the fly to maximize uptime. There is a 30-second cycle time regard- less of the number of slit widths, which is ideal for hand-wrap products. A pull- through trim system eradicates trim jams Stretch Film Line redefines Modular Efficiency Selector plugs can be changed with mi- nimal downtime allowing product flexi- bility in layer-sequencing to easily ac- commodate production schedules. The customer has been pleased with overall performance and reports very few medium gels and no large gels in films, which is paramount to thin film produc- tion. The combined IR web measurement system, profile control, melt delivery and gravimetric rate control has resulted in a deviation of less than one percent, re- gardless of film thickness, resulting in su- perior roll quality. Pictured is Davis-Standard’s S3 winder, which enables maximum slit widths for hand-wrap, machine-wrap and jumbo rolls to support multiple market segments tels KREYENBORG IRD Infrarot-Drehrohr- trockner unter Einwirkung von Wärme und permanentem sowie schonendem Durchmischen zu einem Produkt „ver- bunden“. Darüber hinaus wird das PTFE/SAN innerhalb weniger Minuten getrocknet, so dass der hohe Wasseran- teil von über 25% auf circa 0,3% redu- Die beiden Komponenten, PTFE (unter dem Markennamen Teflon ® bekannt) und SAN (Styrol-Acrylnitril-Copolymer) werden in diesem Prozess zu einem Pro- dukt verbunden. Das PTFE/SAN-Gemisch weist eine hohe Klebrigkeit auf und ver- klumpt sehr stark. Der Prozess: PTFE und SAN werden mit- Effiziente Trocknung von PTFE/SAN-Gemisch mittels IRD Infrarottrockner ziert wird. Das PTFE/SAN-Gemisch bleibt im IRD kontinuierlich in Bewegung. So wird während des Trocknungsverfahrens zum einen ein Verkleben des Materials verhindert und zum anderen ein homo- gener Energieeintrag gewährleistet. Der Prozess wird durch die besondere Effi- zienz der infraroten Behandlung stark