High-pressure headbox

High-pressure (closed) headbox runs with an air cushion and with deflocculation rolls. It is used particularly on paper machines intended for a speed up to 600 m/min. with diverse substances, i.e. with different flow rates and consistencies. The headbox provides uniform distribution of paper stock on a PM longitudinal wire.

Design

The headbox 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 headbox. The headbox stock supply is provided through an inlet body or diffuser plate.

Top lip regulation

The headbox precise design and machining of the top lip enable its adjustability in two directions, i.e. upwards and downwards. 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 micrometric 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)

Material

• headbox is made of stainless steel
• stands are made of structural steel and galvanized 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
• air pump
• distribution piping
• basement 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

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
• provided protection against lip bending
• automatic blocking of an upper lip movement
• simple operation and easy maintenance
• minimum spare parts

Machine design and work safety are in compliance with EU standards.

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