What Is a Guide Roller?

The guide roller, also known as the leader roller, is used to keep the copper mesh in a normal and fixed position during operation. When the copper network deviated, it was adjusted back to its original position, and the copper network always led the correct path.

Guide rollers guide and drive the wire and felt of the paper machine's wet and drying sections. The guide rollers in both areas use the same bearings. However, different lubrication and sealing are used depending on the application location. In old-fashioned paper machines, grease is commonly used in the wet section and oil is used in the dry section. nowadays

1. The peeling strength of the composite film is not enough

There are several situations:

The glue is not completely cured, and it is still sticky when peeled off. the reason:

1) The proportion of the adhesive is wrong, and the curing agent is inadequately caused to cause incomplete curing. When formulating the adhesive, it should be formulated according to the mixing parameters specified by the adhesive manufacturer;

2) The purity of the solvent is not enough. The solvent contains water or alcohol exceeding the standard. The water or alcohol reacts with the curing agent in the glue. The reduced proportion of the curing agent results in incomplete curing of the glue. The solvent used for dry compounding is ethyl ester, so every batch of ethyl ester should be sampled when entering the factory. If it is found that the purity is not enough, it should not be used;

3) The high residual solvent of the ink in the printing film causes insufficient curing of the glue.

1.Electrophoretic coating

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In order to improve the wear resistance and crack resistance of the guide rollers of the rolling mill, plasma cladding technology is used to cladding Al ₂ O ₃ doped Fe-Ni-based high-temperature wear-resistant alloy coating on the surface of 45 steel. The process flow is 45 round steel blank guide roller blank plasma cladding surface grinding of the guide roller plasma alloy guide roller.

After testing, the coating obtained by the above-mentioned plasma cladding process is uniform and dense, with no pores and cracks. Because the 45 steel substrate has good thermal conductivity and solidifies quickly when cooled in air, the microstructure and precipitated phases of the coating obtained are very fine and uniform.

Compared with the conventional high chromium cast steel guide roller, the plasma alloy guide roller has a significantly longer service life. The service life of high chromium cast steel guide rollers is generally 8 hours. After that, severe wear grooves and fatigue cracks will appear. Deep grooves generated by wear will cause steel sticking and stuck steel, which will seriously affect the surface quality of the steel, thus Scrap invalid. Plasma alloy guide rollers have significant ability to resist abrasive wear and thermal fatigue, and their average service life reaches 138 hours. In addition, after repairing the guide rollers, the average service life can reach 96 hours, which is very effective.

Through comprehensive evaluation of the plasma alloy guide rollers, it can be known that the application of plasma cladding technology to the guide rollers of the rolling mill can significantly improve the service life of the guide rollers of the rolling mill, thereby reducing the handling costs of the guide rollers, reducing the labor intensity of frequent replacement and the guide The waste of rolling work time caused by the disassembly and transportation of the rollers can increase the rolling volume, save a lot of high-quality steel, and reduce the safety accidents caused by the damage of the guide rollers. ^[3]