CCS355 Neural Network & Deep Learning Unit II Notes with Question bank .pdf
Air cushion Headbox .pdf
1. High-pressure (closed) head box runs with an air cushion and with deflocculation rolls. It is used particularly on
paper machines intended for a speed up to 500 m/min. with diverse substances, i.e. with different flow rates and
consistencies. The head box provides uniform distribution of paper stock on a PM longitudinal wire.
A History of more then 150 Head boxes Kunal@microfabindustries.com
2. Design
The head box is made of stainless steel. It comes in a shape of a box. Its inside surfaces, coming in contact with the
stock, are electrochemically polished. The turbulent stock flow is enabled by a diffuser board and defloculating
rolls with adjustable speed. There is a rotary antifoam and rinsing shower pipe installed inside the head box. The
head box stock supply is provided through an inlet body or diffuser plate.
Top lip regulation
The head box precise design and machining of the top lip enable its adjustability in two directions, X & Y
Direction . The bottom output edge can be slipped out. The lip provides certain vertical flexibility which allows fine
profile adjustment. The top parts of the top lip spindles are equipped with worm gears with micro metric
indicators that can be preset with individual accuracy of 0,01 mm or with stepping motors connected to the
control system of the machine.
Main parts
* Inlet body (manifold) (1)
* The headbox (2) (front, rear, bottom part and side plates)
* Deflocculation rolls with drive (3)
* Front part control (4)
* Top lip regulation (5) (mechanical, automatic)
* Position indicators
* Level and pressure sensor
* Antifoam shower pipe (6)
A History of more then 150 Head boxes Kunal@microfabindustries.com
3. Material
+ Headbox is made of stainless steel
+ stands are made of structural steel and Galvanised outwardly; also possible stainless steel
+ basement rails are made of cast-iron
+ inside surfaces coming in contact with the stock are polished
Accessories
^ headbox stands
^ front service bridge or front and back service bridge incl.
^ ladders wair pump
^ distribution piping wbasement rails
^ regulating valves
^ format guides
^ inlet piping
^ gate valve of a pressure knotter
Scope of delivery
- complete machine according to main parts description
- accessories optionally
A History of more then 150 Head boxes Kunal@microfabindustries.com
4. Advantages
+ faster and more precise control
+ possibility of corrections in a close profile range through slice profiles changes
+ possible regulation of output lip slipping during operation w
+ provided protection against lip bending
+ automatic blocking of an upper lip movement
+ simple operation and easy maintenance
+ minimum spare parts
Regards
Kunal S Rana
A History of more then 150 Head boxes Kunal@microfabindustries.com
