Enzymatic Degumming
Pectate lyase acts as a specialized biochemical catalyst during the wet processing stages of linen manufacturing, specifically targeting the pectic substances that bind technical flax fibres together within the plant stem architecture. Jiangsu spinning mills apply this alkaline depolymerising agent in controlled aqueous baths to cleave the alpha-1,4-glycosidic bonds of galacturonan polymers without damaging the underlying cellulose framework. Such targeted cleavage reduces mechanical energy demands during subsequent mechanical scutching and hackling operations while preventing the fibre strength degradation associated with harsh caustic soda boiling.
Mill operators monitor bath temperature, pH levels, and reaction duration closely to maintain enzyme stability, because excessive activity leads to over-maceration and reduced yarn tensile performance during subsequent ring spinning runs.
Fiber Acceptance
Exporters and mill buyers evaluate treated flax technical fibers against strict contractual thresholds recorded in the official lot inspection certificate before the spinning stage commences. Residual pectin content serves as the primary metric for determining whether biological degumming reached the required completion point specified in the purchase agreement. Technicians measure breaking tenacity, elongation percentages, and fineness in decitex using standardized laboratory conditioning protocols.
Any lot exceeding the maximum allowable residual gum percentage fails mill acceptance criteria, leading to automatic rejection or downward price adjustment based on processing liability.
Fabric Grading
Woven linen cloth undergoes rigorous physical inspection after wet finishing to separate export-grade textiles from lower-tier commercial output according to standardized grading manuals. Inspectors evaluate finished fabric handle, residual shrinkage, and tear resistance across warp and weft directions under controlled lighting environments. A fabric grade differs fundamentally from a raw fibre grade, shifting the focus from individual strand tensile properties to surface regularity, yarn density uniformity, and dye uptake consistency across the entire bolt length.
Pectate lyase application efficacy earlier in the production chain directly determines the final cloth hand and drape characteristics recorded in these commercial finishing documents.
