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1. use ultrasonic energy to cut, weld, seal seam, hole, emboss, stitch, slit, form. color & fold.
2. need no traditional needle & thread.generally need no plastic film & paper.
3. no dissipated edge, wrinkle & shrinkage.
4. can work continuously for mass production.can work curves; easy to change rollers.
5. can print color on the laces with colored paper.
6. no smoke, spark, danger.
7. accurate & durable alloy rollers are designed by computer aid & made with sculpthured mold.
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