Reconciling Scouring Mass Loss and Wet Contraction in Landed Linen Fabric Costing
Landed linen costing requires dividing greige linear price by the net length yield factor while netting out chemical scouring mass loss from gross roll weight.
Jigger Boiling Off
Batch Treatment
Textile finishing machinery utilizes reversing roll-to-roll immersion baths to perform batch scouring and preparation on woven fabrics. In linen processing plants, jigger boiling off treats heavy flax fabrics with concentrated alkaline solutions at near-boiling temperatures to saponify natural oils and remove stubborn impurities. The fabric rolls completely from one main roller to another while submerged in a low-liquor-ratio bath below.
Steam covers retain heat and prevent selvedge cooling during passage cycles.
Process Kinematics
Uniform treatment across the fabric roll demands precise control of web speed and fabric tension. As the fabric roll diameter changes on the driving and driven rollers, automated drive systems regulate spindle rotation speeds to maintain constant linear web velocity and uniform tension. Constant reversing end-to-end passes ensure equal chemical exposure between outer roll layers and core layers.
Low tension settings prevent fabric elongation, which otherwise leads to width loss and localized crease marks in stiff flax weaves. Chemical additions occur incrementally at end-of-pass transitions to prevent concentration gradients.
Quality Compliance
Incomplete saponification leaves localized wax deposits that cause stripe defects during subsequent dye applications. Inspection protocols verify absorbency and whiteness index across full batch length after rinsing. Successful jigger boiling off ensures consistent dye receptivity across heavy linen fabric lots.