SLM-B model is suitable for slitting plastic film,like PE,PP,OPP,etc SLM-1300 ... .Unwinding part adopts Taiwan magnetic powder brake, realizes by the PLC automatic counting,as well as constant tension control for unwinding4.transmissiont part uses ... .Rewinding part uses the vector frequency conversion motor,to drive magnetic powder clutch,realized by the PLC automatic diameter counting, auto tensity ...