Higher unwinding and winding speeds


US extrusion machinery maker Davis-Standard will exhibit a high-speed unwind during K2016 that is engineered for splice speeds up to 800 m/minute for sensitive, thin webs. This unwind features pneumatic splice-unit control for improved processing and functionality. It is uniquely engineered for extrusion coating applications involving aluminium foil and PE films.

The two-position, shaftless, phantom-axis turret design offers several advantages:

  • Driven idler rolls on the turret
  • Direct spindle drive using a timing belt without backlash
  • Cross-cut knives on the turret between two driven idler rolls
  • Lightweight carbon fibre knife holder
  • Inverter controlled turret drive
  • Precision turret control with an absolute encoder
  • Continual gap mode between the bumper roller and reel during the unwinding process
  • Automatic air inflation for pneumatic chucks with pressure control
  • Tension control via a long-stroke dancer roll
  • Ultrasonic sensor measurement for the incoming roll diameter
  • Automatic edge guide control

The unwind is capable of roll diameters from 300 to 1,000 mm with a maximum diameter of 800 mm for aluminium foil, and a maximum roll weight of 1,800 kg. It is ideal for aluminium foil webs ranging from 6 to 20 µm and PE films from 30 to 100 µm.

The unwind is typically used as an auxiliary unwind for aseptic packaging lines to maintain consistent high- speed operation. However, it can also be used as the primary unwind for flexible packaging lines that process a wide range of substrates, including paper up to 150 gsm.


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