Headbox for Paper Machines
a) Pressurized Headbox
The pressurized headbox is operated by the pressure of the air. The pond level is maintained at a certain point. Above that level, it contains pressurized air. The head determines the slice jet speed that contains two to three rectifier rolls.Applications & Salient Features
- Shape difference across the deckle in max ±2 GSM
- Manifold is offered as per the quality and production capability
- Speed up to 250 m/min to 500 m/min respectively
- Slice width up to 8000 mm
Advantages
- Gives excellent results with all types of papers
- Sturdy and durability provides long-life
- Reliable performance
- Low maintenance
- Power saving
b) Hydrolic Headbox
Hydraulic headboxes are designed for twin-wire forming.
These types of headboxes are available with or without a stabilization chamber. The stabilization chamber is a tube bank(turbulence generator) that is present between the chamber and the slice. Improving the velocity profile of the cross-section is the main function of the tube bank.
Applications & Salient Features
- Manufactured with high-quality material & modern techniques
- Used for high-speed machine operations
- Can produce higher grade writing/printing papers, coated/uncoated duplex board, tissue papers, etc.
- Speed up to 500 m/min & 1500 m/min respectively
- Slice width up to 8000 mm
Advantages
- Compact size, therefore, requires less floor space
- Higher safety and reliability of operations
- User friendly
- Low maintenance
- Power saving
