Deriving Finished Linen Mass Metrics from Greige Thread Density and Wet Processing Shrinkage
Deriving finished linen mass metrics requires transforming greige thread density using dimensional shrinkage and chemical scouring mass loss coefficients.
Thread Density Calculation
Warp Calculation
Counting the individual ends per unit distance across a loom beam governs how tightly flax yarn packs into a grey linen cloth before finishing begins. Mill technicians apply thread density calculation during the preparatory warping stage to establish the exact number of wet spun warp yarns required to cover a given reed width without overlapping. Flax fibre possesses rigid inelastic properties that prevent yarns from stretching during tension adjustments, so warp arrangement demands precise numerical control before sizing agents enter the liquor bath.
Excess spacing causes uneven cover factor values in the finished fabric, whereas overcrowded ends create friction points that break brittle vegetable filaments during shedding motions. Inspectors record these counts on the mill production sheet alongside batch numbers from the spinning room.
Reed Density
Determining how many dents contain specific yarn counts dictates the final pick spacing and surface texture of unbleached flax cloth on the loom. Weavers check this metric against the export specification sheet to ensure commercial linen meets contracted weight parameters before delivery to the port. Laboratory staff separate raw fibre grades from finished fabric grades by measuring linear density variations under standard atmospheric humidity conditions.
Mill standards govern internal operational tolerances for yarn placement, while buyer acceptance criteria dictate strict penalty limits for broken ends per linear metre.
Tension Ratio
Regulating the mechanical pull on flax warps during shedding prevents excessive warp breakage across wide looms. Operators monitor how much mechanical force draws the yarn from the creel to the cloth roll, keeping yarn elongation within safe margins for vegetable fibres. Excessive draw stretches the inelastic bast material beyond recovery limits, causing permanent deformation in the woven linen piece.
Production logs store these mechanical values to verify compliance with export quality requirements. Proper calibration of mechanical pull ensures uniform fabric structure across every manufactured batch.