Analysis on the defects and corresponding measures of melamine impregnated wallpaper

What are the defects and corresponding measures of melamine impregnated paper wallpaper? The melamine impregnated paper will be introduced to you in detail.

1. Adhesion to the polishing plate: The melamine resin partially adheres to the polishing plate during curing, which causes the surface of the veneer to crack. The reasons are:
①The curing time is too long or the hot pressing temperature is too high;
②There is no release agent in the melamine resin;
③The quality of the polishing plate decreases.
The above shortcomings can be overcome by adjusting the hot pressing temperature, adding a release agent when adjusting the glue, and a better polishing plate, such as a chrome-plated polishing plate.
2. The surface of the wallpaper is porous: the porous wallpaper is mainly due to the insufficient flow of the resin under high temperature or low pressure. In addition, the surface structure of the particleboard also has a certain influence on the wallpaper. Therefore, the pressure can be increased to the maximum, and the volatile content of the paper and the resin can be increased. content; increase the content of modifier to 0.5%, in addition, check whether the impregnated paper is stored for too long or improperly.
3. The layering and bubbling of the wallpaper, the layering of the wallpaper mainly includes the following aspects:
①Resin waterproof paraffin, oil or paraffin coating on the surface of the particleboard;
②The resin content in the impregnated paper is very small , the resin fluidity is too low, so that the resin on the particleboard surface is insufficient; ③ the moisture content of the particleboard is too low or the volatile content of the impregnated paper is too low.
Bubbling of the cloth is caused by the fact that the substrate is too thin or the moisture content is too high to generate water vapor during the veneer time, which causes bubbling when the press is turned on.
4. Damage to the edge of the board When the wallpaper is trimmed, the edge is damaged due to the tearing of the wood chips. The reason for the defect may be: the strength of the edge of the substrate is not enough; the shear strength of the surface of the substrate is not enough, or the shape of the tool, sawtooth It needs to be adjusted, and the sawing speed is too low or the feed speed of the board is too fast. Therefore, in addition to purchasing high-quality substrates, the tools should be checked regularly.
5. Folding of impregnated paper during hot pressing: There are many reasons for the folding of impregnated paper during hot pressing. Generally, the following measures are taken to overcome:
①Slow down the closing speed of the press;
②Check the pressing strip of the upper polishing plate Whether it is warped or whether the polishing plate needs to be renewed;
③Check the electrostatic device and clean or change the power supply;
④Check the climate condition of the impregnated paper in the storage room and the rigidity of the wet paper.
6. Paper wrinkling immersed in the drying box: the measures taken are:
①Relax the friction brake on the loosening device to reduce the tension of the paper;
②Reduce the paper friction between the driving roller and the driven roller Tension;
③ After the base paper passes through the first dipping tank, the scraper is loosened and driven.
7. Causes of surface water marks (wet flowers):
①The moisture content of the substrate is too high;
②The measuring instrument for the moisture content of the impregnated paper is not installed properly;
③The residual volatile matter of the impregnated paper is too much ;
④The edge temperature of the wallpaper is too low and the impregnated paper regains moisture during storage. br />③Adjust the drying process conditions of the impregnated paper;
④Increase the temperature of the hot pressing plate by 5℃. In addition, pay attention to the storage of the impregnated paper.
8. This type of defect of milky spot mainly occurs in the hot-pressed color plate, and the main reasons are:
①The pressure is too low;
②The thickness tolerance of the substrate is large;
③The polishing plate Infected.
The main measures to be taken are:
②High hot pressing plate pressure;
②Adjust the amount of sanding of the substrate or increase the thickness of the substrate;
③Clean the polishing plate or replace. In short, the defects in the production process of melamine resin-impregnated veneer wood-based panels are constantly discovered, and the reasons are found to overcome them. As long as we strictly follow the process requirements and check the quality, we will be able to produce more and better products. Enterprise economic benefits.
The above is today's sharing, I hope it can be helpful to everyone. For other relevant information, you can follow our website or contact us by phone.

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