Technical textiles take an important place in textile and apparel sector. In technical textiles, ultrasonic seaming method besides conventional seaming methods is one of the alternative methods used in seaming processes of functional textiles. In this study, the effects of ultrasonic seaming method in which needle and thread usage is not needed on waterproofing property of PU coated fabrics in comparison with conventional seaming methods were investigated. Sewn fabrics obtained with different seaming parameters were exposed to washing process and the waterproofing properties of these fabrics were tested considering before and after washing processes. The results evaluated in terms of seam type, fabric type, ultrasonic seaming velocity and washing process were statistically analyzed. According to the test results, waterproofing properties of ultrasonically sewn fabrics are higher than that of conventionally sewn fabrics. The difference between waterproofing values of ultrasonically and conventionally sewn fabrics are found to be statistically significant. It is determined that waterproofing property of the fabrics are in relation with the other parameters.
Ultrasonic seaming has become an important issue in recent years due to its various features. In this study, waterproof polyester knitted fabrics with polyurethane coating were used and the bursting strength, bending property and water permeability property of ultrasonic seaming were examined by changing various parameters. Besides, the ultrasonic seaming method was compared to conventional seaming and adhesive tape application. It is observed that there were high water permeability values generally in ultrasonic seaming and also fabrics with no water penetration were seen in this method, although, in some ultrasonic seaming parameters, values are lower than adhesive tape sealed ones. On the other hand, the bursting strength values of the ultrasonically sewn fabrics are found to be comparable to conventional seam and sealing adhesive tape when the optimum seaming parameters are determined. Also, it can be said that for the bending property according to increasing bending length values in this method compared with the others, ultrasonic seaming may find more usage areas where fabric stiffness is more advantageous. It has been observed that it is important to determine the fabric and ultrasonic sewing parameters according to the required performance property.
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