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.
Greige Defect Four Point Grading
Quality Assessment
Standardized visual inspection protocols allow textile mills to objectively evaluate the quality of unfinished woven linen before it enters the dyeing and finishing stages. The system of greige defect four point grading assigns penalty points to woven flaws based on their size and severity.
Penalty Allocation
Defect lengths determine the specific point values assigned during the inspection process on the backlighting table. Flaws measuring up to three inches receive one point, while those between three and six inches receive two points. Longer faults of up to nine inches receive three points, and anything exceeding that length receives four points.
This arithmetic progression ensures that severe defects such as thick bars or long slubs are heavily penalized.
Grading Outcome
Inspectors calculate the total penalty points per one hundred square yards of fabric to determine the commercial grade of each roll. Rolls with point totals below the buyer’s established threshold receive first-quality status, while those exceeding the limit are classified as second-quality or rejected outright. Mill managers utilize these calculated totals to adjust loom settings, identify yarn batches with high defect rates, and manage supplier performance.
The resulting grade determines the market value of the greige cloth and governs the financial settlements between the spinning mill and the weaving factory. Most global buyers accept a maximum of forty points per hundred square yards for premium linen.