Coating & Laminating
Ready for action: New demo coating line in Austria
premises in Lenzing, Austria. This line represents a valuable tool for meeting customer needs and it demonstrates the company’s ongoing commitment to the support of product development in the extrusion coating field. SML did not aim to design a
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small, multipurpose line that could do everything to a certain degree, but nothing perfectly. Instead, it was decided to invest in a full-scale
ML recently installed a FlexPack extrusion coating and laminating line at its
production line. The resultant, future-oriented line has the same dimensions and functions as any other of the new FlexPack lines operating at its customers’ production facilities, and is equipped exclusively with first class components, which guarantee maximum reliability and top quality. The equipment is located in a
separate section of the SML plant, adjacent to conference rooms and a test laboratory. This line can be cordoned off from the rest of the building thus providing secrecy for both customers and their products.
It can handle substrates in the
700 to 1,650mm width range with maximum production speeds of up to 450m/min. Substrates can include oriented film, barrier film, paper, aluminium foil and nonwovens. Both unwinds, as well as the rewinder, are of fully automatic turret design and equipped with a shaftless core clamping system. A primer coating unit with closed
chamber doctor blade system and a five metre-long drying tunnel ensure superior adhesion even on printed products. Moreover, in order
to guarantee that sufficient bonding force is also available at high line speeds, it is possible to apply ozone on both sides of the die to accelerate melt curtain oxidation. A Ø 90mm and a Ø 60mm
extruder in combination with a variable three-layer feedblock and an automatic die with edge bead reduction system facilitate the production of more complex structures. With a footprint of less than 19m
x 14m the line sets new benchmarks in terms of compactness. It might be thought that this design could have a negative influence on operability, but SML has demonstrated the opposite. Practice has shown that such a compact design is even easier to handle than older systems and that the short web paths have a positive effect on web guidance and the quality produced. The complete line is controlled by a safety PLC, which ensures the highest possible safety standards and provides maximum comfort for the machine operators. The line can be used for a variety
of applications. Typical products are found in the fields of flexible and industrial packaging, along with a number of technical solutions for the building industry. In addition, the line is equipped with SML’s DoubleCoat technology for which a patent is pending. This new feature makes it possible to serve completely different markets with breathable products such as surgical drapes, for the medical industry, hygienic films and diapers.
called ‘DoubleCoat’ process, for which a patent is currently still pending. It has been integrated into the FlexPack extrusion coating line, thereby enlarging considerably the attainable range of breathable products. DoubleCoat combines extrusion coating with hot melt lamination and thus
New coating technology for breathable films S
Correction from April 2016 issue:
ML has developed and installed a new laminating line that is capable of downgauging the coating layer to a previously unobtainable extent using the so-
facilitates coating thickness minimisation. For expample, a minimum coating layer thickness of 6g/m2 can be achieved using TPE on a PP nonwoven. This corresponds with roughly a mere quarter of the current average for such coatings and results in enormous material savings. Product quality is guaranteed, and even with thin coating layers adhesion to the substrate is perfect and no pinholes occur. Another feature of the process is enhanced product breathability. The coating
thickness has a significant effect on the water vapour transmission rate (WVTR), as a thinner layer results in a reduction in water vapour flow resistance. Consequently, standard product breathability can be increased several times over. A further advantage offered by the new process is a reduction in the melt temperature to a minimum, with very positive effects. The DoubleCoat process provides fresh possibilities for enhanced product properties and lower production costs with regard to a variety of
applications, including medical products such as surgical drapes, which are highly breathable, flexible and protect against viruses. Interested customers will soon be able to see the performance of SML’s FlexPack extrusion coating line with the DoubleCoat process as a production
uwww.sml.at
scale pilot plant will be available from this month.
16
July/August 2016
www.convertermag.co.uk
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