Headbox sheets for tissue machines

Valmet Headbox Sheets incorporate technological know-how based on over 40 years of OEM experience in providing this product

Headbox sheets used in the headbox are vital for producing a uniform jet flow from the headbox slice to the forming section. The sheets have a significant impact on tissue quality features such as formation, CD basis weight profiles and layer properties, all of which affect the overall tissue machine productivity.

Benefits

  • Improved sheet formation
  • More uniform CD basis weight
  • More clear and defined layers when running in layering mode

 

Valmet Headbox Sheet PC is the most widely used sheet material

Valmet Headbox Sheet PC

The most commonly used sheet material is polycarbonate (PC), also known as Lexan.

  • PC withstands high operating temperatures (up to 135°C, 275°F)
  • Not resistant to alkalis or solvents
  • Expected lifetime 6 months
  • Easily adaptable to any headbox design

Valmet Headbox Sheet CF provides long useful sheet life from 3 to 7 years

Valmet Headbox Sheet CF

Carbon fiber sheets are made in one piece: hinge and sheet are combined to each other without glued joints.

  • Excellent wear resistance. Life expectancy 3 - 7 years
  • Good chemical resistance. No need to remove from the headbox for boil-out.
  • No thermal distortion or expansion
  • Great lateral stiffness results in easier removal and installation in and out of the headbox
  • Unlimited shelf life - no degradation during storage

 

Valmet Headbox Sheet GF glass fiber vane for tissue headboxes

Valmet Headbox Sheet GF

 

  • For tissue headboxes
  • Made of special glass fiber composite material
  • Excellent chemical resistance
  • Superior surface finish
  • Expected lifetime 3-7 years

 

 

Valmet Headbox Wedge GF for improved control of headbox flow turbulence

Valmet Headbox Wedge GF

 

  • For tissue headboxes
  • Made of special glass fiber composite material
  • Excellent chemical resistance
  • Superior surface finish
  • Expected lifetime 3-7 years

 

 

Headbox Sheet PVC

Valmet Headbox Sheet PVC

 

Valmet Headbox Sheet PVC provides good chemical resistance for lower temperature applications.

  • Made of polyvinyl chloride (PVC)
  • Good chemical resistance (withstands alkalis, but not dissolvents)
  • Maximum operating temperature 50°C, 122°F
  • Expected lifetime 6 - 12 months

 

Headbox Sheet PVC-C

Valmet Headbox Sheet PVC-C

 

Valmet Headbox Sheet PVC-C offers good chemical resistance combined with good thermal resistance.

  • Made of improved polyvinyl chloride
  • Better thermal resistance compared to standard PVC: max operating temperature 75°C
  • Good chemical resistance (withstands alkalis, but not dissolvents)
  • Expected lifetime 12 months