Category: Equipment and tools

The following notes are from the choice between servo motors and stepper motors.

Winding converts flat web into roll form and typically there are 3 types of winding as the following:

Proper web handling is to provide good web-tension isolation between the unwind, process and the winding tension. Pull rolls are critical components in web handling system

For professional coater, the tension is isolated into 3 zones: unwinding zone, internal zone, rewinding zone. Tension=torque/roll radius. During coating, the diameters of unwinder and rewinder are constantly change; therefore, to keep tension constant, torque should change according to roll diameter change. 

Web spreading is a critical technology to remove wrinkles in web handling. There are three techniques to achieve the purpose: