Q&A

CE safety machine requires to meet the main directives:

2014/30/UE    Electromagnetic Compatibility

2006/42/EC     Machinery Directive      

2006/95/EC     Low Voltage Directive

For different machines, different standards are requested, such as:

EN ISO 12100 :2010     Safety of machinery - General principles for design – Risk assessment and risk reduction

EN ISO 13849-1:2015   Safety of machinery - Safety-related parts of control systems -Part l: General principles for design

Our machines design meets required EN ISO standards, applicable for CE Safety Certification.

1. Safety Covers for moving parts is the basic when machine is running.
   
   
2. Mechanical Safety Pins together with Electrical Safety Sensors to lock the moving parts and deactivate the driver power when adjustment or maintenance is processing.
   
   
3. Emergency Stop not only on main operation panels, but also other accesses.
   
4. Safety lock for maintenance engineer to secure their work in safe circumstances.

1. Tension roll is surface coated with Polyurethane which is softer than metal, but it is endurable to take friction and sharp burr on slit strip edge to guide slit strips running in steady way.
2. Tension rolls is designed to produce tension by about 2% speed slower on tension rolls than recoiling speed. This approximately 2% speed differential can generate electricity feed-back to decrease the machine power consumption. The money saved years round can cover the expense for replacement of PU when the roll surface is critical damaged.

The main differences are listed in below table.

Leveler roll diameter design is a complex calculation including material tensile strength, palsticication ratio, roll clearance, roll deformation, 

For example, metal material of tensile strength 400 Mpa, the reference diameter of leveler rolls are below.

Ø50mm for material max. 2.0mmt.

Ø60mm for material max. 3.0mmt,

Ø70mm for material max. 4.5mmt,

If one leveler can't cover all the material thickness , two levelers or exchangeable double cassette levelers can be considered.

For example, one cassette leveler with Ø50mm rolls can manage material up to 2.0mm in thickness. but maximum material is 3mm in thickness, then another cassette with Ø60mm leveler rolls will fit. The product range of same cut-to-length line extended from 2mm thickness to 3mm thickness.

Some customers even choose levelers of Ø50mm rolls and Ø70mm rolls in separate two, so the product range is enlarged from maximum 2 mm to 4.5 mm.

Laser Guides for Height and Edge are our auxiliary devices to help operator to load on coil easily by laser mark guidance. The devices are controlled by buttons on operation panel. This function is particularly useful for CE and EN ISO-13849-1 safety machines, of which the operator stay outside the fence in distance to load on coil. 

Laser Height Guide can help operator follow the laser mark to align the coil height to top of mandrel.

Laser Edge Guide can help operator follow the laser mark to align coil at center of mandrel.

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.

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,

In normal case of slitting knife clearance is 10% of the material thickness, e.g. if the material is 0.3mm in thickness, the knife clearance is 0.3mmx10%=0.03mm.

In order to get proper clearance, you need to have special spacer 1.94mm.

Below are some examples for your combination reference.

1. To get slit width 23mm: (needs special spacer 1.94mm)
   10(knife)*2+0.03(clearance)*2+1.94(spacer)+1.0(spacer)=23mm 
2. To get slitting width 23.1mm:
   10(knife)*2+0.03(clearance)*2+1.94+1.1 (spacer)=23.1mm
3. To get slitting width 24mm:
   10(knife)*2+0.03(clearance)*2+1.94+2 (spacer)=24mm