Scope of Application of Open Headbox

Scope of Application of Open Headbox
The application scope of an open headbox mainly includes the following aspects:
1. Paper machine speed
Open flow boxes are generally used for low-speed and medium speed paper machines. Specifically, they are suitable for paper machines with a speed range of 100-700m/min. When the vehicle speed increases (such as greater than 250 meters/minute), in order to achieve a suitable online slurry speed, it is necessary to increase the liquid level, which will increase the height of the equipment, resulting in a large mass and size of the slurry box, and an unreasonable structure. Therefore, on high-speed paper machines, it is generally more inclined to use air cushion flow boxes or other types of equipment.
2. Paper weight range
The open flow box is suitable for producing various types of paper with a weight range of 20-400 grams. Among them, 20-120 grams are thin cardboard, 120-200 grams are corrugated cardboard, 200-300 grams are white cardboard, 300-400 grams are gray backed white paper, etc. During the production process, an open flow box can adjust the thickness and appearance quality of the paper, ensuring both production efficiency and paper quality.
3. Application field
The open flow box is not only suitable for the production process of paper machines, but also widely used in downstream packaging, printing and other fields of the paper industry. In the field of packaging, it is widely used in the production process of cardboard boxes, which can ensure the strength and quality of cardboard boxes and is suitable for the production of various types of cardboard boxes. In the field of printing, open flow boxes can be used to improve the printing quality of paper during the coating process.
4. Technical characteristics and advantages
Pulp level control: An open headbox uses the pulp level inside the box to control the speed of the online pulp, usually achieved by adjusting the height of the weir plate inside the box.
Homogenization roller: The open flow box is equipped with a homogenization roller, which is used for rectifying and dissipating energy, making the paper material more balanced and uniform.
Strong adaptability: able to adapt to a large range of vehicle speed and flow changes, suitable for various types of paper machines and paper production.
In summary, open flow boxes have broad application prospects in low-speed and medium speed paper machines, specific weight range paper production, as well as downstream packaging and printing in the paper industry. However, with the continuous improvement of paper machine speed and requirements for paper product quality, new equipment such as air cushion flow boxes are gradually showing their advantages and application potential.