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Thermal sprayed coatings

VRS-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

VRS-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.

VRS-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

VRS-CARBIDE D 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.

VRS-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

VRS-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.

VRS 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

VRS-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.

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

VRS-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.

VRS-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

VRS-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.

VRS-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

VRS-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.

VRS-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

VRS-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.