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Valmet Headbox Sheets

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 end product quality features such as formation, CD basis weight profiles, thickness and sheet edges, all of which affect the overall paper machine productivity. Valmet Headbox Sheets incorporate technological know-how based on over 40 years of OEM experience in providing this product.

Benefits

  • Improved sheet formation
  • More uniform caliper
  • Enhanced edge properties
  • More uniform CD basis weight
Valmet Headbox Sheet PC             Valmet Headbox Sheet CF
Valmet Headbox Sheet PC1  is the most widely used sheet material.  

Valmet Headbox Sheet CF2 provides long useful sheet life from 3 to 5 years.

Valmet Headbox Sheet PVC   Valmet Headbox Sheet PVC-C

Valmet Headbox Sheet PVC3 provides good chemical resistance for lower temperature applications.

 

Valmet Headbox Sheet PVC-C4  offers good chemical resistance combined with good thermal resistance.

                            Valmet Headbox Sheet GF                        
  Valmet Headbox Sheet GF5  glass fiber vane for tissue applications  

 

 

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

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 - 5 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 PVC

  • 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

 

Valmet Headbox Sheet PVC-C

  • 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

 

Valmet Headbox Sheet GF

  • For tissue headboxes
  • Made of special glass fiber composite material
  • Excellent chemical resistance
  • Superior surface finish
  • Expected lifetime 3-10 years

 

 

1 earlier known as PolySheet
2 earlier known as DuraSheet
3
earlier known as ChloriSheet
4
earlier known as EasySheet

5 earlier known as CompoVane