Woven Fabric Weight Tolerances and Linear Metre Yield Calculations
Reconcile woven fabric purchases by calculating linear yield from conditioned mass and usable cuttable width under ISO 3801 and ISO 139 parameters.
Finish Mass Addition
Chemical Quantification
Quantitative chemical analysis determines the dry weight of finishing agents applied to a textile substrate relative to its untreated mass. Finishing plants utilize finish mass addition to verify that softeners, water repellents, or flame retardants have been applied at the correct commercial dosage. This calculation measures the actual chemical residue left on the fabric after drying and curing.
It applies to all chemical finishing stages, but does not measure mechanical finishes like calendering.
Measurement Procedure
Technicians weigh a fabric specimen before and after removing the applied finish with a selective solvent. The solvent dissolves the finish without damaging the underlying base fibres. The specimen is then rinsed, dried, and re-weighed.
The weight difference indicates the dry weight of the finish applied during tentering.
Performance Correlation
The amount of finish applied directly affects the physical properties of the fabric, such as water column height or drape. If the addition level is below the specified target, the fabric will fail its performance tests. Conversely, excessive addition can cause yarn slippage and reduce tear strength.
Maintaining the correct dosage is a delicate balance.
Cost Management
Chemical finishes represent a substantial part of the material cost of technical textiles. Accurate measurement of the finish mass addition prevents waste of expensive chemicals and ensures consistent product quality. It provides the mill with a clear record of chemical usage for billing.