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

#CMT# #/CMT# 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. #CMT# : #/CMT# 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. #CMT#USE : #/CMT# Head box for a machine for manufacturing a single-layered fibrous material sheet, particularly single-layered paper or cardboard web from a fibrous material suspension (Claimed). #CMT#ADVANTAGE : #/CMT# The unit is provided, which applies a medium, particularly non-forming sheet medium on the free jet for covering the free jet surfaces of the free jet, and hence ensures formation of non-forming sheet medium in a simple and effective way. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic longitudinal sectional view of a head box. 1 : Head box 4 : Head box nozzle 6 : Upper nozzle wall 7 : Lower nozzle wall 17.1,17.2 : Free jet surfaces 20 : Unit 21 : Medium.