... knife,decrease cutting obstruction,low noise N.C Cutter , Use for corrugated paperboard production line.(1) Machine speed: 180m/min 200m ... groups of copper tubes to distribute in various gears position for the oil,the lubrication and cooling.(6) Helical knife structure ... cutting obstruction,low noise.(7) Balance treatment:high quality alloy steel for blade shaft,which helps to keep it good stability.(8 ...