Causes of abrasion of the dewatering wire section of a paper machine

What are the reasons for the abrasion of the dewatering wire section of the paper machine? We understand common couch roll wear, vacuum suction box wear, chemical corrosion, dewatering element and roll wear and tension wear, which will be introduced in detail below.

1) Couch roll wear theory:

Since the couch roll is one of the main driving rollers of the wire section, the tension of the fabric changes greatly when it enters and exits the couch roller.In particular, the abrasion of the fabric will increase under the vacuum suction of the vacuum couch roller. In addition, for the plastic fabric, if the couch roller is a copper roller, the couch roller will be corroded to varying degrees, which will also affect the life of the fabric.

2) Wear theory of vacuum suction box:

It is believed that it is caused by the friction between the mesh knitting section and the suction box panel, especially when filler particles accumulate on the box panel, which exacerbates the wear of the mesh.

3) Chemical corrosion theory:

It is believed that the smaller the pH value of the upper fabric slurry, the more acidic it is, and the higher the temperature, the more severe the corrosion.

According to analysis, when the pH is below 4.5 and the temperature is 18~20℃, the corrosiveness of white water is very severe. According to another analysis, when the pH of the alum solution is 4, in the range of 20~45℃, every 10℃ increase will increase the corrosion rate by about 2 times.

4) Dewatering element and roller wear theory:

When the surface of the dehydration element is uneven or has sharp burrs, it will increase the wear of the fabric. In addition, if there are burrs, blisters, or unevenness on the roller, it will damage the fabric. Furthermore, if there is a doctor blade that comes into contact with the fabric on the paper machine, it will also be rough and easily damaged. When the roll doctor blade is not tight, the roll sticking is also one of the reasons for the increased wear of the fabric.

5) The fabric is worn out due to improper control of the tension of the fabric.