Head box for machine for manufacturing single-layered fibrous material sheet, particularly single-layered paper or cardboard web from fibrous material suspension, has head box nozzle tapered with exit slit cavity at exit slit

摘要

The head box (1) has a head box nozzle (4) tapered with an exit slit cavity at an exit slit. The head box nozzle has an upper nozzle wall (6), a lower nozzle wall (7) and two side walls. A fibrous material suspension comes out of the head box nozzle as free jet contains two free jet surfaces (17.1,17.2). A unit (20) is provided, which applies a medium (21), particularly non-forming sheet medium on the free jet for covering the free jet surfaces of the free jet. An independent claim is included for a method for manufacturing a single-layered fibrous material sheet, particularly single-layered paper or cardboard web from a fibrous material suspension.