Air Jet Spun Yarn Mechanics in Elastic Woven Fabrics
Air jet core-spun yarns deliver torque-free, pill-resistant elastic wovens by locking polyurethane filaments inside parallel staple cores bound by vortex wrappers.
Pilling Resistance ISO 12945
Method Selection
Fabric surface degradation through the formation of small fiber balls is assessed using standardized mechanical friction testing. Evaluation of pilling resistance ISO 12945 specifies the laboratory methods for rubbing specimens against each other or an abrasive medium to simulate wear. This standard includes different approaches such as the pilling box, the random tumble pilling tester, and the Martindale method.
Choosing the correct method depends on whether the material is a woven fabric, a knitted fabric, or a fleece construction. The chosen method determines the type of mechanical agitation the specimen receives.
Specimen Preparation
Samples are conditioned in a standard atmosphere before testing to ensure uniform moisture content. They are mounted securely onto holders or tubes to prevent wrinkling during the rubbing action. Proper mounting is necessary because folds can cause localized, non-representative abrasion.
The test is run for a specified number of cycles depending on the target end-use.
Visual Evaluation
Rating of the tested specimen uses a standard five-point scale in a controlled viewing cabinet. Grade five represents no change, while grade one indicates dense, severe surface fuzzing and pilling. Multiple observers evaluate the samples to reduce subjective variance in the final grade.
Commercial Standard
Retailers specify minimum acceptable grades before approving fabric batches for production. Most garments require a grade of three or four to pass inspection. This ensures consumer satisfaction.