When fabric is cut and sealed using ultrasonics, is the seam as strong as that sewn with a needle and thread?
Yes. In fact, the seam ultrasonics creates is stronger than regular needle and thread bonds, because needles create holes in the fabric that can weaken the material. Also, if you lose one needle and thread sewn stitch, the whole seam is compromised, since all the stitches are connected. If you lose one “stitch,” or weld, in an ultrasonic seam it will maintain its integrity, because each ultrasonic weld is independent.
