Mass Addition
Nominal percentage additions of dry polymeric film to warp yarns during slasher sizing protect single yarns against mechanical abrasion during high-speed weaving. Warp size allowance specifies the planned dry weight ratio of starch or polyvinyl alcohol binder added to raw yarn mass. Sizing polymers consolidate surface fibres, lay down protruding fuzz and increase tensile strength to withstand loom beat-up forces.
The targeted add-on percentage varies based on yarn spun type and fabric weave density. Correct sizing allowances prevent warp end breaks without making yarns overly brittle.
Production Influence
Weaving efficiency correlates directly with accurate size application across the warp sheet. Under-sized warps suffer frequent end breaks from reed friction, lowering weaving shed productivity. Over-sized warps create stiff yarns that cling in the shed opening, causing yarn breakage and fabric defects.
Financial Accounting
Trade transactions for unwashed grey fabric account for added size solids when evaluating official loom-state weights. Contract specifications separate raw fibre mass from water-soluble sizing chemicals to determine net fabric yield. Cost models deduct size content to calculate accurate clean dry fibre weight before finishing operations.
Commercial Limit
Sizing add-on specifications establish maximum allowable size mass percentages prior to fabric desizing. Excess warp size allowance increases chemical consumption and effluent biological oxygen demand during wet preparation. Uncontrolled size levels incur financial penalties under grey fabric purchase contracts.
