Concerning wound mill roll quality and take-up tension control

Biaxially oriented web manufactured by the tenter method is first wound into a mill roll as the middle stage of the product roll manufacturing process. It is well known that mill roll winding quality greatly affects final product roll quality and productivity when finished by a slitter-rewinder. The key determinant of rewind quality is of course the basic performance of the winding system itself and its operation technique. However, another point which is rarely mentioned, yet is perhaps more important, is that of the tension control function which has an effect on web take-up as it comes out of the tenter. My paper introduces and explains some examples of practical facilities technology, focusing on this point