Abstract
Extensive investigations of sewn seams in coated fabrics have been conducted. The relative roles of thread, sewing machine components, stitch and seam types and properties of fabrics have been evaluated as parameters involved in seam leakage. Utilization of various experimental seam constructions, gasketing, application of heat during seam sewing and other techniques were attempted as poten tially useful approaches in combating seam leakage. Results indicate the main source of leakage, under experimentally generated hydro static pressure conditions, to be in the folds of the fabric and the needle holes generated in the sewing operation. Post sealing, accord ingly, must be considered to be a necessary requirement for all coated fabrics to assure moisture-proof seams under field use conditions.
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