Coating Removal
Quantitative analysis of the non-fibrous materials added to warp yarns during the sizing process involves chemical or enzymatic dissolution. Following iso 7211 size extraction allows a laboratory to determine the exact weight of the starch or synthetic binders applied to the linen. This step is necessary to confirm that the fabric weight meets the buyer’s specification after all processing aids are removed.
Desizing Evaluation
The procedure requires boiling the fabric in specific reagents to ensure that every trace of the sizing agent is stripped from the flax bundles. In iso 7211 size extraction, the difference between the original dry mass and the final desized mass reveals the size pick-up percentage. This information is vital for finishers who need a clean substrate for even dyeing and bleaching.
Lab technicians use analytical balances to measure the weight change to three decimal places. Each sample is rinsed multiple times in distilled water to ensure that no chemical residue remains on the flax fibres.
Fabric Analysis
Accurate measurement of the underlying fibre weight helps in identifying the true construction of the weave. Results from iso 7211 size extraction are recorded in the technical data sheet to prove that the manufacturer has not used excessive sizing to inflate the fabric weight. Standardized extraction ensures that the reported linen content is precise and verifiable.
