Balancing Bast Fiber Loom Shed Relative Humidity and Warp Regain
Balancing bast fiber loom shed humidity requires maintaining 76-80% RH to achieve 12% warp regain, preserving yarn elasticity and preventing size film dusting.
PVA Starch Size Performance
Sizing Efficacy
The application of polymer coatings to warp yarns before weaving represents the primary method for preventing yarn breaks on the loom. High pva starch size performance ensures that the natural flax fibres are locked in place, reducing hairiness and abrasive wear.
Film Properties
This composite coating combines the high adhesion of polyvinyl alcohol with the rigidity of natural starch to form a tough protective shell on the yarn surface. Sizing technicians evaluate the mixture by measuring its viscosity, temperature stability, and penetration depth into the yarn core. When the recipe is mixed correctly, the size film is both flexible and strong enough to withstand the rapid cycling of the loom healds.
Proper adhesive penetration prevented the fibres from sliding past one another under high warp tension.
Weaving Outcome
Superior pva starch size performance leads to a dramatic reduction in yarn breakages and loom stoppage rates, directly boosting mill productivity. The treated yarns glide smoothly through the metal drop wires and reed without shedding excessive amounts of dust or starch powder. After the weaving process is complete, this size mixture is easily washed out during the scouring stage to ensure the fabric achieves its final soft hand.
Weaving managers monitor the desizing efficiency to verify that no residual polymer remains to block the absorption of subsequent dyes. This chemical performance is documented in the sizing log of the weaving mill.