With the continuous improvement of scientific and technological level, the processing technology and efficiency of the coating machine are improving. Now it is developing rapidly in the market, which has driven the development of some industries, especially in electronic coating, or gluing and the like. Or in carton packaging, these coating machines will be used a little more, and new technologies will be continuously introduced, and the environmental protection processing will be more powerful.
The function of the coating blade of the curtain coating equipment is to measure and control the desired coating amount on the surface of the paper sheet, remove excessive coating, and this process can improve and improve the smoothness and gloss of the coated paper sheet surface. In order to achieve the above goals, what are the key points of the coating process of the coater?
1. It is the requirement for the quality of the scraper of the coating machine. The working surface of the coating blade must be free of crack defects and ensure uniform—and the same anti-friction (abrasion resistance) across the coated surface—to keep the coated sheet surface the same after the coating process quality.
2. Talk about the importance of the supply space: When the paint is applied by the scraper, 85 to 95% of the paint will flow back to the paint reserve system, so there is a need for a sufficient space in this area to complete the loading and reflow.
3. How to avoid the occurrence of backflow: After the paper web is coated by the blade, the coating starts to dehydrate and gradually solidifies - forming a "semi-dehydrated coating area", where the coating is gradually dehydrated along the advancing direction of the base paper. When the coating is further dehydrated to form a "precoat" or "filtered bread", the pressure of the blade "transfers" the shape of the coating blade surface to the surface of the paper coating. The pressure is the largest, so a thin coating is easily formed behind the tip of the blade. Excessive pressure or poor paint rheology can cause backflow. Therefore, the coating machine needs to reasonably adjust the knife pressure according to the site conditions to avoid backflow.
During the operation of the coating machine, the transmission parts are seriously worn. The first is the wear of the drying cylinder shaft head, and the second is the wear of the bearing chamber of the reel roll. When solving the problem, surfacing welding and heat treatment are generally used. Repair by spraying, brush plating, etc. If the machine is seriously worn, return to the factory for repair as much as possible. When using the machine on a daily basis, follow the correct steps, and do a good job in the daily maintenance of the machine, so as to reduce machine wear and prolong the service life of the coating machine. Inquiry uv coating machine for sale.
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