2. Traditional Sewn Seams
Sewn seams are created using sewing needles with a diameter of approximately 0.0270 inches, and they rely on thread to hold the materials together. While sewn seams also provide a similar level of strength as fused seams, they do not completely prevent bypass. Bypass refers to the potential for substances to pass through the perforations or gaps created by the stitching. The choice of material plays a role in the effectiveness of sewn seams. For example, needle-punched felt tends to collapse around the thread, potentially creating perforations that allow for bypass. In contrast, woven textiles maintain their structure, resulting in perforations that can allow controlled bypass of varying dimensions.