Optimizing Relay Nozzle Dynamics for High Hairiness Bast Fiber Shedding in Air Jet Looms
Optimizing relay nozzle pressure vectors, timing overlap, and reed profile clearance eliminates hairiness-induced stops in high-speed bast air-jet weaving.
Grey Cloth Four-Point Grading
Defect Rating
Textile inspection standards establish the numerical penalty points assigned to fabric defects discovered during post-weaving evaluations. The grey cloth four-point grading system allows mills to classify woven linen prior to the dyeing and finishing stages. This method assigns demerit points based on the size of the defect, up to a maximum of four points for a single issue.
Inspection Threshold
Inspection tables equipped with bright lights and slow-moving rollers help quality inspectors locate slubs or broken warp yarns. During a grey cloth four-point grading run, the length and severity of each imperfection determine the points accumulated per one hundred square metres. A total score below twenty points typically earns the fabric a top grade classification.
This assessment dictates whether the roll proceeds to bleaching or is demoted to secondary uses. Consistent application of this inspection standard on the raw woven loomstate fabric avoids wasting chemical dyestuffs on material that contains structural flaws.
Classification Criteria
Quality departments record the accumulated points on the inspection docket of each finished roll. When the grey cloth four-point grading score exceeds thirty points, the lot is sold as seconds or redirected to discount markets. This rigorous screening prevents the costly processing of highly defective cloth that would ultimately be rejected by the buyer’s finished product auditors.
The resulting classification records are stored in the mill’s shipping files to justify the export invoice value.