Crease Recovery Angle

Test Protocol

Operators cut five square specimens from both the warp and the weft directions of the conditioned flax batch using a sharp die. Each sample folds in half under a weighted metal press for exactly five minutes on a smooth horizontal surface inside a controlled testing chamber. Technicians transfer the compressed specimen to a graduated circular protractor disc where the hinged leaf swings upward under its own weight for another five minutes.

The protractor scale registers the exact number of degrees between the hanging free limb and the vertical drop line at the end of the recovery period. Mill inspectors average these individual angular readings to establish the official grade recorded in the mill production ledger alongside tensile strength and weight metrics.

Acceptance Boundary

Export buyers establish distinct minimum angular thresholds that differ significantly from the internal quality tolerances maintained by the spinning mill. A batch passing the mill standard for domestic bedding can fail the stricter crease recovery criteria demanded by foreign garment manufacturers who produce unlined summer jackets. Inspectors reject any linen consignment falling below the agreed angular limit regardless of yarn regularity or dyeing uniformity because substandard elastic recovery ruins the drape of tailored apparel.

The numerical result solely predicts the immediate behavioral response of the cloth under casual folding pressures and ignores permanent creasing caused by sustained mechanical flattening during industrial laundering cycles.