Length Accuracy
Two types, stop-to-cut type with guillotine shear or non-stop cutting type with rotary or flying shear. The differences are as below table.
|
ItemType |
Stop-to-cut |
Non-stop cutting |
|
Shear type |
Guillotine shear |
Rotary or flying shear |
|
Shear drive |
Hydraulic |
Servo motor |
|
Cutting process |
Feeding – stop – waiting shear to cut (one cycle) |
Non-stop feeding & shear tracking length to cut |
|
Material thickness |
0.2~ 25mmT |
0.2~ 4.5mmT |
|
Scratch on surface |
No scratch |
No scratch |
|
Roll mark on surface |
Depends on material |
No mark |
|
Critical required surface |
Not recommended |
Recommended |
|
Productivity |
As standard base |
About 2~5 times higher |
In short, the advantage of rotary shear and flying shear is faster production speed, no roller mark on material surface, and that of guillotine shear is cost lower.
EPC is the initial of “Edge Position Control” which is important for the quality products of both cut-to-length machine and slitting machine.
The EPC starts functional from Uncoiler positioning to follow the side guide before leveler.
EPC dynamically keep the material coil edge aligned constantly so to make sure diagonal accuracy of cut sheets or edge straightness of slit strips.
If without EPC, especially when the thin material coil band is off edge line, coil band might get damaged on the edge whilst coping with side guides which try to force the band edge back to the line,