Extrusion Asia Edition 1-2024

29 Extrusion Asia Edition 1/2024 新型辊筒排布 – 拉伸间隙更小 SML最新MDO单元的主要技术特点之一，是优化工艺的 辊筒排列。拉伸间隙以电动方式调节，这使得操作和更换产品 非常简便快捷。由于拉伸辊的直径为220 mm，拉伸间隙可保 持在50和220 mm之间（薄膜在辊筒间的自由长度）的狭窄范 围内，拉伸辊之间的距离可降低到仅为几毫米。拉伸区压辊的 位置也可调节，这确保了薄膜的理想拉伸过程，不受拉伸间隙 的影响。 SML新型人机界面实现轻松设置 最后，MDO单元的所有工艺参数均可实现数字化记录， 可通过SML的新型人机界面轻松设置和调节。 SML的新型多功能流延薄膜生产线可供客户试用和生产 样品。 “Our new multi-purpose cast film line will not fail to impress even long-serving experts. The line has the technical capacity to fulfil almost every customer requirement in cast film produc- tion”, Elias Mayrhofer, R&D Engineer at SML, comments with pride. The cast film line is ready for the production of CPP, CPE, Cast-PET, barrier, as well as for mono-oriented films. The appli- cation areas are comprehensive as well: They range from film for metallised and laminated standard food and non-food pa- ckaging to easy-to-recycle stand-up pouches of MOPE film and ➠ SML Maschinengesellschaft mbH Gewerbepark Ost 32, A-4846 Redlham, Austria Elias Mayrhofer, mel@sml.at, www.sml.at further to label film, and also include technical products like cable insulations and easy-tear MOPP film. Despite its wide functional range, the line can be further optimised for the ma- nufacturing of specialised products – assuring the highest effi- ciency and maximum quality. Coherent concept “A central characteristic of all of our machinery is the coherent line concept that we continue to develop and optimise,” Elias Mayrhofer states. This is underlined yet again by the modern and clear design of SML’s multi-purpose cast film line, which of- fers the following technical features: • Five extruders for the processing of PP, PE, PA, PET, EVOH, as well as adhesives • A seven-layer variable geometry feedblock with the possibility of numerous different layer arrangements • Die width 2,850 mm, with internal deckling system two times 350 mm • New MDO unit: maximum roll temperature of 160 ° C, maximum stretching ratio 1:10 Horizontal sliding winder for up to 4 part bobbins MDO unit for mono-materials One key innovation featured in SML’s latest cast film line is the MDO unit, that is also designed for the manufacturing of easy- to-recycle mono-material films such as MOPP, MOPE and MOPET. With this MDO unit, properties such as the film strength in the machine direction, stiffness and puncture resistance are in- creased even further, while the film thickness and elongation in the machine direction are significantly decreased. SML has streamlined the whole MDO process: The clean and straightforward design makes operation comfortable and pro- vides sufficient space for maintenance offering easy access. New roller arrangement – tight stretching gap One of the main technical features of SML’s latest MDO version is the process-optimised roller-arrangement. The adjustment of the stretching gap takes place in a motorised fashion, making the operation and alternations for product changes quite simple. As the stretching rollers have a diameter of 220 mm, the stretching gap can be kept narrow in a range between 50 and 200 mm (free length of the film between the rollers). While the distances between the stretching rollers can be reduced to a few mm only. The positions of the nip rollers in the stretching area are adjustable too. This ensures an ideal stretching process of the film, independent of the defined stretching gap. Comfortable settings with SML’s new HMI Finally, all the process parameters of the MDO unit are digitally recorded and can be comfortably set and adjusted with SML’s new HMI. SML’s new multi-purpose cast film line is available to customers for trials and sample production.