The creasing line is not clear and there is “buried wiring” or “bursting line”
Buried wiring means a creasing line that should not be existed. Bursting line refers to the overpressure of cutting indentation, exceeding the tolerance limits of the paper fibers, so that part of the paper fiber breakage or fracture.
⑴The selection of creasing line and creasing matrix is not suitable.
Whiteboard Groove depth of creasing matrix = Paper thickness
Groove width of creasing matrix = Paper thickness x 1.5 + thickness of creasing line
Height of creasing line = Height of die cutter- Paper thickness (±0.05)
Corrugated cardboard Groove depth of creasing matrix = Thickness of corrugated cardboard after pressing flat
Groove width of creasing matrix = The thickness of corrugated cardboard x 2 + the thickness of creasing line
Height of creasing line = Height of die cutter - Thickness of corrugated cardboard after pressing flat
⑵The pressure adjustment of the die cutting machine is improper; The pressure is adjusted by the pressure regulating mechanism.
⑶The thickness of fixed base plate is not accurate; The adjustment method is to replay the paper.
⑷Poor paper quality or low moisture content of paper will make paper brittleness increase and toughness decrease which results “bursting line”. It can be solved by increasing environmental humidity.