Dewatering Element Ceramic Vacuum Suction Box

Introduction

The vacuum suction box is a dehydration element of the fourdrinier paper machine. When the pulp reaches the vacuum suction box, the concentration has reached 2%-3%. On low-speed paper machines, the concentration of pulp can reach about 11% when it passes through the vacuum suction box, while it can reach more than 15% on high-speed paper machines.

Structure

1.Face board: Long strip board with rake angle, horizontal support surface and backward inclination angle. The bottom is made into various tongue and groove shapes to match the connection bracket.

The face board requires a low coefficient of friction and is wear-resistant. Commonly used materials are high-molecular polyethylene, inlaid ceramic strips, and all-ceramic blades.

High-density polyethylene has a life of about 3 months, is low price, can be reground three times, and is only used for low-speed paper machines;

The service life of ceramics can reach several years, and the friction coefficient on the paper-making wire is small, and it is easy to keep clean. Although the cost is high and the processing difficulty is large, it is used more and more.

2.Frame: It is a stainless steel box structure, which requires high rigidity and small deformation. The brackets at both ends can be adjusted back and forth and up and down.

Dehydration process

Stage 1: The moisture content of the wet paper web is very high, and the moisture is filtered and discharged under the pressure difference caused by vacuum, which is called free dehydration
Stage 2: The wet paper web is compressed under the pressure difference, and compression dehydration occurs
Stage 3: The air begins to penetrate the paper web, and a part of the moisture between the fibers is brought into the suction box with the airflow, forming aerodynamic dehydration.