Folding
Defective characteristics:
① The steel pipe has a regular folding of a triangular shape, a straight line -shaped shape, and a single seam straight line or irregular sheet.
② The vertical appearance of the steel pipe shows a folding of the pinch of the pinch of 60 °, 120 °, and 180 ° sewing needle.
③ The longitudinal appearance of the steel pipe shows a spiral fold.
④ The surface of the steel pipe has a long point of long or short oblique lines on the surface of the steel pipe, and two or three of 120 ° are staggered in severe cases.
cause:
① The surface of the tube has longitudinal cracks or severe mixed objects, and the shrinking hole and other spiral folds are generated.
② Poor surface cleaning on the tube blanket, with sharp edges and corners or existence of external skin.
③ Perform tumor tumor or perforator Exit mouth scratching the hair tube.
④ Cracks or bumps with rolls or tensor reduction.
⑤ Disposal rollers are not required, super life, and improper use of old and new racks.
⑥ A mechanical abrasion or injury during the steel pipes of the machine.
⑦ Small cooling water of the tensor roller or without causing tensor roller sticky steel.
