Circular vs Multi-Edged Blades When Cutting Resin-Based Engineered Textiles
Cutting engineered textiles can become particularly challenging when the material combines abrasive fibers such as aramid with plastic, resin, binders or other polymer-based components. In these applications, choosing the right blade is not only a question of sharpness. Blade geometry, rotational speed, friction and heat generation can all influence cut quality, material build-up and blade life.
Circular vs Multi-Edged Rotary Blades
A common question in plotter and CNC cutting systems is the difference between using a circular blade and a multi-edged blade. The answer often depends on how the material behaves during the cutting process.
A razor blade usually produces the cleanest cut. Secondly, a traditional circular rotary blade also produces a clean and fine cut quality.
However, because the circular blade rotates continuously against the material, friction generates heat during operation. When cutting engineered textiles that contain plastic, resin or similar polymer-based components, this heat can soften or melt material onto the blade edge and surface.
Over time, the melted material forms a negative coating around the cutting edge – what we call material build-up.
Once build-up occurs, the blade gradually stops cutting efficiently and instead begins pushing and/or tearing the material. This can result in poorer edge quality, increased cutting forces and more frequent blade cleaning or replacement.
Lower blade rotation speeds can reduce heat generation and slow down the build-up process, but blade geometry can also have a significant influence.
Why Multi-Edged Blades Can Reduce Material Build-Up
Multi-edged rotary blades do not maintain constant cutting-edge contact with the material in the same way as a fully circular blade.
As a result, they can reduce friction and heat generation and give the blade edge short interruptions between cutting contacts. In resin- or plastic-containing textiles, this can help reduce the amount of softened material adhering to the cutting edge.
The downside is that the interrupted cutting geometry can produce a rougher or less precise cut compared with a fully circular blade.
This creates an important balance:
More continuous cutting contact = finer cut quality, but potentially more heat and material build-up.
More interrupted cutting contact = less build-up, but potentially a rougher cut edge.
Comparing Circular, 10-Edged and 16-Edged Blades
To investigate this balance, Sollex compared a traditional circular blade with 10-edged and 16-edged rotary blade geometries when cutting engineered textile containing abrasive fibers and polymer-based material.
With the fully circular P945 blade, the cutting result was very fine and clean. However, the combination of continuous blade contact, plastic/resin and aramid resulted in material gradually building up around the cutting edge.
The 10-edged geometry, such as the geometry used on Sollex Z52, successfully reduced the material build-up. The trade-off was a slightly less smooth cut compared with the fully circular blade.
A 16-edged geometry behaved somewhere between the two. It provided more cutting contacts than the 10-edged version and therefore a smoother cutting action. However, especially as cutting speed increased, resin deposits could again begin accumulating on the blade.
This demonstrates that there is no single blade geometry that is best for every engineered textile.
The optimum solution depends on the required balance between:
- Cut quality
- Blade speed
- Friction and heat generation
- Resin or plastic content
- Fiber type
- Material build-up
- Blade life
- Cleaning and maintenance requirements
Engineered Textiles Create a Difficult Cutting Combination
Technical and engineered textiles can combine several characteristics that are individually difficult to cut.
Aramid fibers, glass fibers and similar reinforcement materials are highly abrasive and therefore place significant demands on blade wear resistance. At the same time, polymer coatings, resins and binders can soften through frictional heat and adhere to the blade.
Technical textile manufacturers also work with warp-knitted structures and coated fabrics where chemical binders and polymer coatings are used to achieve specific properties. This makes blade selection increasingly dependent on the complete material construction rather than simply the textile fiber itself.
The cutting tool therefore has to manage two different problems simultaneously: abrasive fibers wearing the cutting edge and polymer material sticking to it.
Choosing the Right Rotary Blade
For applications where the highest possible edge quality is required, a fully circular blade can provide an extremely clean and continuous cut.
When material build-up becomes the limiting factor, however, moving towards a multi-edged geometry can improve process stability.
Sollex rotary knives such as Z50, Z52 and Z53 are designed for CNC digital cutting systems and technical materials including aramid, carbon fiber, fiberglass and other industrial textiles. Z50 and Z52 use multi-edged rotary geometries, while different blade diameters and geometries allow the cutting process to be adapted to material thickness, cutting force and required edge quality.
The objective is not simply to find the sharpest blade.
It is to find the blade geometry that produces the required cut quality without allowing heat and material build-up to become the limiting factor in production.
Fine Cuts Without Material Sticking to the Edge
If a circular blade gives excellent cut quality but resin or plastic starts building up on the cutting edge, a multi-edged rotary blade can be worth testing.
More edges can provide the balance between a fine cut and reduced material adhesion to the cutting edge.
For resin-based engineered textiles, Sollex can compare different circular and multi-edged geometries to determine which blade provides the best combination of cut quality, blade life and production stability.
Related Products
Sollex Z50 – 10-edged tungsten carbide rotary knife, Ø25 mm.
Sollex Z52 – 10-edged tungsten carbide rotary knife, Ø32 mm, developed for demanding flexible, fibrous and composite materials.
Sollex Z53 – tungsten carbide rotary knife for technical textiles and composite materials.
Suitable applications include aramid and Kevlar® fabrics, carbon fiber textiles, fiberglass, technical textiles, non-wovens and other demanding engineered materials.
