Thermal sprayed coatings

AK-CARBIDE

Applications: lead rolls, pope reel rolls, winder drive rolls

Technical specifications

Cover thickness: 60–300 μm, usually 60–80 or 120–150 μm.
Hardness: 1,100–1,200 HV
Maximum usage temperature: No limitation
Surface roughness: 4–5 µm
Colour: Grey
Doctoring: Carbon fibre composite blade

AK-CARBIDE is a conventional, high-friction cover made of thermally sprayed tungsten carbide. It has excellent wear resistance and a long grinding interval. The coating can be deep cleaned by sandblasting it once over the course of its service life.

Advantages

Excellent wear resistance.
High friction.
Excellent doctoring properties.
Allows for on-site coating.

AK-CARBIDE C

Applications: hard rolls, thermo rolls and deflection-compensated rolls in super, soft and multinip calenders

Technical specifications

Cover thickness: 100–300 µm
Hardness: 1,100–1,200 HV
Surface roughness: 0.04–0.08 µm
Maximum usage temperature: No limitation
Allowed maximum load: No limitation
Colour: Grey/chromium
Recommendation for doctoring: Carbon fibre composite blade

AK-CARBIDE C is a thermally sprayed tungsten carbide cover with a long grinding interval. The excellent wear resistance of the cover helps maintain the surface roughness consistent, thereby contributing to the paper’s excellent transverse profile throughout the operating period.

Advantages

Excellent wear resistance.
Long grinding intervals.
Excellent surface quality.

AK-CARBIDE D

Applications: lead rolls, spreader rolls and drying cylinders

Technical specifications

Cover thickness: 100–200 µm
Hardness: 900–1,300 HV
Maximum usage temperature: 160°C (continuous)
Chemical resistance: Excellent
Colour: Grey
Doctoring: Carbon fibre composite blade

AK-CARBIDE D combines thermally sprayed tungsten carbide and fluoropolymer surface treatment. The Dyrel fluoropolymer provides cleanliness and chemical resistance similar to those of sintered PTFE/FEP materials. Furthermore, it provides first-rate doctoring properties and corrosion resistance. The Dyrel fluoropolymer maintains its hardness at high temperatures considerably better than conventional PTFE/FEP materials.

Advantages

Excellent cleanability and chemical resistance.
Good doctoring properties and corrosion resistance.
Maintains its hardness at high temperatures.
Suitable for on-site coating.

AK- CERAM

Applications: centre press rolls, shoe press counter rolls

Technical specifications

Cover thickness: 650–700 µm
Hardness: 900–1,100 HV
Surface roughness: 0.6–1.6 µm
Maximum usage temperature: No limitation
Allowed maximum load: No limitation
Colour: Dark grey
Chemical resistance: Excellent
Recommendation for doctoring: Carbon fibre composite blade

AK-CERAM is a thermally sprayed ceramic roll cover with excellent corrosion resistance and wear properties, optimal web release properties and first-rate doctoring properties.

Advantages

Excellent corrosion resistance.
Very good web release properties.
Excellent wear resistance.
Stable surface roughness value.
First-rate doctoring properties.
Very good chemical resistance.

AK-CERAM L

Applications: lead rolls

Technical specifications

Cover thickness: 100–250 µm
Hardness: 900–1,100 HV
Surface roughness: 0.6–1.6 µm
Maximum usage temperature: No limitation
Allowed maximum load: No limitation
Colour: dark grey
Chemical resistance: Excellent
Recommendation for doctoring: Carbon fibre composite blade

The thermally sprayed ceramic AK-CERAM L lead rolls replace conventional electrolytic chromium roll covers. The cover is manufactured at our own factory, which reduces the lead time.

AK-CERAM L is a hydrophilic and very hard material, which prevents dirt from sticking and allows easier mechanical removal of any residue and other contaminants.

Advantages

Excellent wear resistance.
First-rate doctoring properties.
Very good chemical resistance.
Can be cleaned mechanically.

AK-CARBIDE N

Applications: lead rolls, spreader rolls and drying cylinders

Technical specifications

Cover thickness: 100–200 µm Hardness: 1,100–1,200 HV
Maximum usage temperature: 130°C (continuous)
Chemical resistance: Excellent
Colour: Grey
Doctoring: Carbon fibre composite blade

AK-CARBIDE N combines tungsten carbide with nanotechnology-based Avalon™ sol-gel treatment. It has excellent wear resistance, cleanliness and cleanability properties.

Advantages

Excellent wear resistance.
Excellent cleanliness.
Easy to clean.

AK-CARBIDE R

Applications: lead rolls, spreader rolls and drying cylinders

Technical specifications

Cover thickness: 100–200 µm
Hardness: 1,100–1,200 HV
Maximum usage temperature: 260°C (continuous)
Friction coefficient: 0.10–0.25
Colour: Dark grey
Doctoring: Carbon fibre composite blade

AK-CARBIDE R combines tungsten carbide with Teflon®. The cover has excellent wear resistance and very good cleanliness and release properties.

Advantages

Excellent wear resistance.
Very good cleanliness.
Easy to clean.

AK-CERAM W

Applications: centre press rolls, shoe press counter rolls

Technical specifications

Cover thickness: 650–700 µm
Hardness: 1,000–1,200 HV
Surface roughness: 0.6–1.6 µm
Maximum usage temperature: No limitation
Allowed maximum load: No limitation
Colour: Dark grey
Chemical resistance: Excellent
Recommendation for doctoring: Carbon fibre composite blade

AK-CERAM W is a thermally sprayed ceramic roll cover with excellent corrosion resistance and wear properties, optimal web release properties and first-rate doctoring properties. The combination raw material makes it very well suited for woodcontaining papers with a high concentration of additives, including newsprint, SC and LWC paper.

Advantages

Excellent corrosion resistance.
Very good sheet release properties.
Excellent wear resistance.
Stable surface roughness value.
First-rate doctoring properties.
Very good chemical resistance.