Size Add-On Control and Measurement
topic
Size add-on percentage is the mass of dry size applied as a proportion of unsized yarn mass, controlled by squeeze roller pressure, size concentration, and yarn immersion length in the size box, measured by weighing sized and unsized yarn samples and calculated as the percentage dry size mass increase; target add-on of 8 to 20 percent for cotton warp yarn is maintained within plus or minus 1 percent by closed-loop squeeze roller pressure control.
Role
Controls the primary sizing quality parameter that determines the balance between adequate warp protection from abrasion and heddle friction and the risk of excessive size causing end-to-end adhesion that increases warp break rate during shed opening, with add-on measurement and control being the key sizing process variable that most directly predicts weaving efficiency performance.