When do we talk about durability problems?
We’re talking about durability problems, if your knife does not achieve the requested durability or the cutting capacity of a new knife decreases just after a few applications.
How can you improve the durability?
We distinguish, if the problem occurs with new knives or re-grinded knives.
New Knives:
Examine your knife quality in regard to the clippings. (Durapid, Duritan, Incomet Supreme) Is a quality update e.g. from Duritan to Incomet Supreme possible?
If the quality is chosen correctly, but the problems with durability still maintain, you should check the knife’s geometry.
General Tip: Use a more pointed angle at smaller grammage and a duller angle at higher grammage.
Re-grinded Knives:
Check the knife’s sharpness. If the knife is dull, let it be re-grinded and straightened professionally.
- The cutting quality decreases
- Notches in the clippings
- The cut is cumbersome and louder than usual
The next testing parameter are the cutting sticks. Are you using the right cutting sticks for the existing knife’s quality?
Our recommendation:
- Use a Polypropylen cutting sticks with a Hardness of 75-78 Shore D for the qualities Durapid, Duritan & Duratec
- Use a Polyamid cutting sticks with a hardness of 81-83 Shore D for the carbide qualities Incomet Supreme & UltraCut.
Please also examine the correct immersion depth of the cutting sticks.
Our recommendation for an ideal immersion depth:
- Immersion depth of the knife into the cutting sticks max. 0,1 mm
- Change or turn your cutting sticks regularly
Check the contact pressure.
Our recommendation of an ideal contact pressure:
- Please use a higher contact pressure for soft papers
- Please use a lower contact pressure for harder papers.
