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+49 2206 605-0
Do you need help?
+49 2206 605-0

Flat top knives

We are happy to offer you individual dimensions in addition to the standard ones.

Outer diameter 90–220 mm
Inner diameter 60–180 mm
Strength 1,2–5 mm
Standard cutting angle 30° / 45° / 60°
DIENES flat top knife

DIENES flat top knives

While dished knives are usually used at low and medium machine speeds, flat top knives are used at higher speeds. Especially for high-performance winders with speeds of over 3000 m/min, among others in the paper industry, these precision knives have become the standard over years.

Use of flat top knives

The profile and thickness of cutting bevel as well as the required lateral contact forces are determined by the type of material to be cut. An essential criterion for the selection of the cutting edge geometry is the displacement of the material when the knife plunges into it. Pre-bevels with different geometries and thicknesses are therefore selected in relation to the material. For example, the bevel angle can be used to influence the contact pressure and cutting edge stability, which in turn can reduce the problem of chipped cutting edges. In addition, the correct bevel angle can reduce the deformation of web edges when converting film products and ensure longer durability of cut edge. This can be demonstrated by computer simulation of stress analysis of cutting edges with different bevel angles. Cutting geometries are divided into type NF (normal bevel), SF (slim bevel), SHF (slim hollow bevel) and SPF (special bevel).

It is recommended to make sure that the outer diameters of top and bottom knives are different. This is the only way to ensure that the wear surfaces do not always meet in the same areas during rotation.

Your advantages

  • Highest cutting performance due to optimised surface quality
  • Best service life due to adapted material qualities
  • Can be used for a wide range of machine types
  • exact manufacturing tolerances
  • DIENES precision grinding Controlleur or Controdur (for solid carbide knives)
  • Regrindable in manufacturer quality

Standard dimensions for flat top knives

Standard materials: chrome alloyed (1.5% Cr), high chrome alloyed tool steels (12% Cr) and powder metallurgy high speed steels, in special cases in solid carbide design.

Standard cutting angle: 30° / 45° / 60 °

Other dimensions and materials on request

Outer-Ø (D1) mm Inner-Ø (D2) mm Thickness (S1) mm
90 60 1,2
105 65 / 70 / 75 1,2 / 1,5 / 2
150 80 / 120 1,5 / 2,5
180 70 3 / 5
190 75 1,5 / 2 / 3
200 65 / 70 / 80 / 90 2 / 2,5 / 3 / 5
220 80 / 90 / 120 / 180 3 / 5
The different bevels of a flat top knife.

Enquiry form – Top knives

For special inquiries you can also contact our contact persons directly.

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Normal bevel, slim bevel, slim hollow bevel or special bevel?

We can help you with questions about knives, knife holders and slitting systems. We will also be happy to carry out a thorough technical inspection to help you exploit potential with regard to the production and quality of your production.

What do I need to consider with my cutting material?

We provide you with an overview of the different cutting materials and what to look out for in each case. Simply filter by the material relevant to you and find out what you should pay particular attention to when selecting DIENES products.