Viscoelastic anti-corrosion tape most common problems and treatment methods

Time:2019-04-04 08:46:09

Viscoelastic anti-corrosion tape is a common anti-corrosion tape because it does not need to be painted with primer, no peeling and no cracking during use. It has strong adhesion, good chemical resistance and the characteristics of the two. very popular. However, if any product is used more, there will be more problems. Today, Xiaobian will take everyone to see what are the most common problems encountered in the use of viscoelastic anti-corrosion tapes!

 What are the most common problems with viscoelastic tape?

1. The thickness of the anti-corrosion layer is uneven

The thickness of the viscoelastic anti-corrosion belt is generally uneven, which will affect the anti-corrosion effect of the pipeline. If it is too thick, it will easily cause waste of anti-corrosion materials.

The reasons for the thickness variation of the anti-corrosion layer are as follows: the die gap adjustment precision of the film extrusion die is not high, the extrusion film is too thick or too thin; the heating pipe of some heating sections of the extrusion equipment is damaged, the accuracy of the temperature measuring instrument is not high, etc. The extrusion film is not heated uniformly; the raw material performance is not up to standard, which will cause the film thickness to exceed the standard; the equipment design accuracy and installation precision are low. During the steel pipe transmission process, the steel pipe is too large, causing the film to be pulled, and the above reasons will cause the anti-corrosion tape. The anti-corrosion layer is uneven or too thick.

2, lap joint defects

Anti-corrosion tape has the problem of lap joint defects. Generally, it appears in the winding method. The surface of the anti-corrosion layer has a spiral anti-corrosion tape with a fixed distance, uniformity and a certain height and a standard anti-corrosion layer thickness. Although it does not affect the anti-corrosion performance of the steel pipeline, Affects the smoothness of the appearance and the minimum thickness required to achieve corrosion protection, which is bound to cause waste of materials. This is because the width of the underlying rubber layer is not matched with the parameters such as the transmission speed and the angle of the roller, resulting in over-lapping. When the polyethylene is wound, a uniform and wide-width protruding overlapping portion is formed on the surface of the anti-corrosion layer.

3, the outer surface wrinkles

In the molding process of the anti-corrosion layer of the viscoelastic anti-corrosion belt, no matter whether the coating method or the winding method is used, there is always an air layer on the surface of the intermediate binder and the steel pipe, and the air layer must be driven out before being coated on the surface of the steel pipe, otherwise An air film is formed between the surface of the steel pipe and the anti-corrosion layer. The film can not be removed by the sealing action of the plastic film under the action of the pressure roller, and flows in a corrugated manner in the rolling direction in the closed region under the action of water cooling. , forming wrinkles, which can cause the anti-corrosion layer to break when it is serious.

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