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Keywords of this article:  extrusion 
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CHINAPLAS 
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extruder 
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DI Martin Kaltenecker, head of Sales Department of SML.
DI Martin Kaltenecker, head of Sales Department of SML.

SML is an Austria-based machinery manufacturer specialized in building high-performance extrusion equipment. Based on more than 40 years’ experience, SML is focused on the development of cast film lines, sheet lines, coating lines as well as on spinning lines for multifilaments.

In the past few years, we had very good projects in China”, DI Martin Kaltenecker, head of Sales Department of SML, told CPRJ at CHINAPLAS 2018.

He mentioned that as the lithium batteries are widely used in China from E&E like mobiles and laptops to electrical cars and buses, the cast film machine has become the best-seller of SML. It can be used for producing lithium battery films.

The China market for lithium batteries is growing significantly. The electric-mobility is becoming more and more important in China due to the strict environmental regulations. Some big cities in Southern China like Shenzhen or Guangzhou no longer use the conventional motor buses, they take electric buses instead,” DI Martin Kaltenecker explained.

In addition, the worldwide demand for lithium batteries is on the rise and most of the lithium batteries are produced in China. “So companies that produce the lithium batteries films will come to find our machines. All of the above are the key driving force of SML products,” DI Martin Kaltenecker continued.

Currently, SML operates sales service offices in Kuala Lumpur, Malaysia, in Beijing, China and Moscow, CIS, with its headquarters and production facility at Lenzing, Austria.

To better support the China market, SML and ExxonMobil worked on developing a new concept for a multi-functional cast film line, which has been successfully commissionedin Shanghai. The extremely versatile line was introduced to the market prior to CHINAPLAS in April 2018.

This new machine can help ExxonMobil to develop the advanced cast film formulations based on its broad portfolio of performance polymers. It also offers solutions for ExxonMobil to test their materials under real production conditions at the same speeds as those used for customers’ lines.

A single machine, multiple applications

The challenge facing SML was clear, thesingle machine had to be capable of manufacturing products for all the relevant cast film applications such as: stretch wrap film; CPP films; breathable and embossed hygiene films; protective and elastic films; as well as mono-oriented films.

Accordingly, the machine’s 1,500mm roll width was designed for quick product changes, testing without an excessive use of raw materials, and the up scaling of test results to larger production lines.

The machine’s key specifications are as follows:

  • Five extruders in sizes from 60 to 90mm
  • Gross output of up to 1,300 kg/h
  • A 7-layer variable geometry feed block
  • Mechanical line speed of 650 m/min
  • Final net film of 1,000mm

A special feature is the mono-axial stretching unit (MDO), which can be operated in-line for breathable hygiene, MOPP and in-line for pre-stretch films. An additional unwinding unit on top of the MDO provides off-line testing from roll to roll.

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