AIR-CUSHION HEADBOX

Characteristic

The air cushion provides a dampening effect on pressure fluctuations in the stock flow entering the headbox. The jet speed leaving the headbox is determined entirely from the height of the free surface inside the headbox. Usually around 10 inches of head on machines running at 500 m/min.

 Description
Can prevents fiber precipita- tion and re-flocculation,and increases the strength of the sheet.
Production and quality targets can be reached more quickly after startup.
Stable jet speed ensure that the pulp speed is coordinat- ed with the speed of the forming wire.