The headbox is a key element in a paper machine to produce high quality papers. The main requirements are:

• Mechanical precision.
• Hydraulic performance.
• Clean operation.
• Good fiber dispersion.
• Reliable profiling control.
• Easy maintenance.

VAS offers a range of headbox designs for every application: pressurized headboxes for low speed machines and hydraulic headboxes for high production speeds.
The hydraulic box design incorporates all the features necessary to ensure the highest performance in all conditions:

• Full stainless steel construction (316 L).
• High finish and electro-polishing on all surfaces in contact with the stock flow.
• Pulsations controlled by external attenuator.
• Controlled microturbulence generated by specially designed stainless steel tubes.
• Symmetrical converging nozzle with lamella technology.
• Computer controlled (QCS) dilution profiling.
• Thermal stabilization, free expansion to avoid distortions in hot operating conditions.
• Easy cleaning and inspection.

All VAS headboxes are supplied fully pre-assembled, pre-piped and pre-wired, and factory tested.