Headbox sheets for tissue machines

Valmet Headbox Sheet PC is the most widely used sheet material

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

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

• 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

• 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 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 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