1. Adhesive pad phenomenon

　　Adhesive pad refers to the process of partially or completely sticking the board onto the pad during hot pressing. There are several reasons for this:

　　(1) Short hot pressing time, or low or locally low temperature of the hot pressing plate, resulting in incomplete resin curing;

　　(2) The moisture content of the substrate is too high;

　　(3) Excessive adhesive content and high volatile matter content on impregnated paper;

　　(4) The surface of the steel is not clean, the type of release agent is inappropriate, or the coating is uneven;

　　(5) Inaccurate positioning of the slab during hot pressing.

　　The sticking phenomenon occurs around the board, which may be due to low edge temperature or excessive deviation of the slab in the press. Each item should be checked to identify the true cause of the occurrence, resolved in a timely manner, and minimize losses. The occurrence of adhesive sticking is often due to incomplete curing of the adhesive, therefore, increasing the temperature or extending the hot pressing time appropriately is an effective method to solve such problems.

　　2. Bent board

　　(1) From the perspective of hot pressing, the warping of the board is caused by the large temperature difference between the upper and lower pressure plates, which results in the asynchronous curing speed of the adhesive film on both sides of the substrate during the pressing process, causing the board to bend towards the side with the fastest curing speed. The author believes that the appropriate temperature difference between the upper and lower pressure plates should be 3-5 degrees higher than that of the lower pressure plate.

　　(2) From the perspective of the material itself, the different properties of the two layers of impregnated paper used in the village material can cause the board to warp. If a single-sided sticker is used, warping is an inevitable result. From the perspective of production, it is possible to ensure that the board does not warp by using the same impregnated paper or adjusting the appropriate temperature of the upper and lower pressure plates.

　　(3) The incorrect stacking method of finished products after hot pressing is another major reason for the warping of the board. The solution is to use uniform and straight wooden pads or trays to store the hot pressed melamine impregnated paper for panel pasting.

　　In summary, to produce high-quality products, it is necessary to select excellent impregnated paper and substrate, as well as reasonable processing techniques; In addition, it is necessary for the operators and inspectors to cooperate fully, and any problems should be promptly reported. Only in this way can the quality of the product be guaranteed.