Yarn Count and Sizing Chemistry in Warp Preparation
Warp sizing requires matching yarn packing factor to polymer viscosity, adjusting squeeze nip pressure for precise solids add-on, and maintaining elongation.
Jet Cooking
Hydration Injection
Starch gelatinization inside flax preparation lines relies on pressurized steam infusion for instantaneous slurry swelling. Jet cooking accomplishes this transformation by forcing steam directly into the water and starch mixture through specialized nozzles. High shear forces break molecular bonds within the sizing agent before application onto warp yarns.
Starch molecules uncoil rapidly under intense thermal and mechanical agitation, achieving complete dispersion without prolonged holding times. Process operators monitor viscosity profiles continuously to verify proper starch cook consistency.
Slurry Viscosity
Warp sizing performance depends heavily on paste stability during continuous loom operation. Fluid dynamics inside the mixing vessel dictate how evenly the starch coats individual flax fibres. Retrogradation occurs if temperature drops prematurely during transfer from the cooker to the size box.
Viscosity measurements confirm whether the starch preparation meets the exact pickup requirements specified for high density weaving. Weave room humidity levels interact directly with the dried size film on the yarn surface.
Stiffness Specification
Fabric hand evaluation distinguishes between native fibre rigidity and applied sizing rigidity on finished linen goods. Buyer acceptance criteria stipulate exact bending length tolerances for high grade shirting materials. Mill quality certificates record breaking load improvements achieved through proper starch penetration into the yarn core.
Laboratory tests measure abrasion resistance on sized warp threads prior to loom insertion. Final evaluation protocols compare grey cloth stiffness against approved commercial reference samples.