Davis-Standard will exhibit a high-speed unwind during K 2016 that is engineered for splice speeds up to 800 meters per minute (2,600 fpm) 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 fiber 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; and automatic edge guide control.
The unwind is capable of roll diameters from 300 to 1,000mm with a maximum diameter of 800mm for aluminium foil, and a maximum roll weight of 1,800kg. It is ideal for aluminium foil webs ranging from six 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.