Specifically, the basic functions of a headbox are manifested in five aspects:
1. Provide a uniform and stable ejection flow to the entire width of the paper machine, avoiding lateral flow, no directional tributaries or longitudinal streaks;
2. Provide a stable lip plate with geometric dimensions that meet the requirements, unaffected by temperature, pressure, and lip opening degree;
3. Form a fiber suspension with minimal flocculation and good dispersion;
4. Provide a control method that can meet the process requirements for horizontal quantitative distribution, drop point, spray angle, and spray speed;
5. Provide convenient measures to keep the headbox clean and easy to operate and maintain.
lt's suitable for the paper machine with working speed 80-280m/min as the requested design.
1.The pulp level in the box is used to control the speed of online pulp (pulp speed), which is usually controlled by adjusting the height of weir plate in the box
2.Equipped with dial gauge for fine tuning.
3.Paper web Lateral directional difference is士1%-2%
4.lt consists of cone duct cloth paste, organic glass, spiral hole diffusion step, before the rectifier roll overflow, the upper lip plate adjustment and upper lip plate spinner indicator.
Adaptive speed : 80-280M/min (designed on requirements)
For example: 1800/200 Open Type Headbox
Paper kinds | Kraft paper, fluting paper |
Raw material | wood pulp, waste paper |
Working speed | 90-180m/min |
Design speed | 200m/min |
Quantitative | 100-190g/㎡ |
Spout width | 2100mm |
Pulp inflow consistency | 0.4%-0.8% |
Dryness of finished paper | 93% |
Beating degree | 20-50°SR |
Diameter of breast roll | D400 |
Headbox bottom rail gauge | 2700mm |
Machine type | Left hand machine |