The coating method of modern board machines is mainly determined based on the equipment, speed, board material, type, use, and investment of the board machine. In the coating method, the current common practice is to pre-coating first, and then topcoat. The pre-coating is generally carried out using a VARI-BAR or a FIL PRESS device. There are also some plants that use a scraper directly. After the pre-coating of the paperboard, it must be dried and then topcoated. The top side is coated with an adjustable scraper, an air knife (AIR KNIFE), and a combination scraper (COMBI-BLADE). Topcoat usually requires one or two coats. As for what type of equipment is used and how many topcoats are applied, this depends on the quality requirements of the final product. 
JAGENBERG's three coating heads for FOLDING BOXBOARD, which uses 100% recycled waste paper for printing, are arranged in this way: 1. Pre-coated with adjustable scrapers. To improve the smoothness and absorption capacity of the cardboard surface. 2. The first topcoat is air knife coating, which increases the coating amount and the whiteness of the paperboard by air knife coating. 3. The second topcoat is a soft knife coating that ultimately gives the cartonboard the best gloss and printability. 
For white cardboard used for brochures, invitations, postcards, etc., the raw materials are bleached Kraft pulp LBKP and NBKP. The positive and negative sides of the cardboard require higher smoothness and glossiness. Therefore, both sides of the cardboard must be processed. One to two coating treatments. JAGENBERG supplied four coating heads for a paper-machine coater that produced white cardboard. The first and second coating heads were used for the pre-coating on both sides of the paperboard. The pre-coated coating heads were Combination scrapers can also be used alternately with adjustable scrapers as required. The coater is equipped with two drying cylinders for drying between precoat and topcoat. The two combined blade coating heads of the top coating section are respectively used for the front and back sides of the cardboard. 
At present, more and more factories choose FILM PRESS film press equipment for pre-coating. The advantage is that it can meet the high bulkiness of paperboard and can effectively prevent the trouble caused by the doctoring paper. Film presses are often used in the production of high-grade coated white and white cardboard. After pre-coating, two coaters are applied by top coat to achieve the desired physical properties of the paperboard surface. 
In the coating technology, the gap between China and foreign countries is narrowing. Some of the well-known coating machine manufacturers in China have been approved by domestic users for their high quality and service. At present, many cardboard factories in China have adopted the domestic three-pass blade coating process and have achieved success. I believe there will be greater progress in the future.
JAGENBERG's three coating heads for FOLDING BOXBOARD, which uses 100% recycled waste paper for printing, are arranged in this way: 1. Pre-coated with adjustable scrapers. To improve the smoothness and absorption capacity of the cardboard surface. 2. The first topcoat is air knife coating, which increases the coating amount and the whiteness of the paperboard by air knife coating. 3. The second topcoat is a soft knife coating that ultimately gives the cartonboard the best gloss and printability. 
For white cardboard used for brochures, invitations, postcards, etc., the raw materials are bleached Kraft pulp LBKP and NBKP. The positive and negative sides of the cardboard require higher smoothness and glossiness. Therefore, both sides of the cardboard must be processed. One to two coating treatments. JAGENBERG supplied four coating heads for a paper-machine coater that produced white cardboard. The first and second coating heads were used for the pre-coating on both sides of the paperboard. The pre-coated coating heads were Combination scrapers can also be used alternately with adjustable scrapers as required. The coater is equipped with two drying cylinders for drying between precoat and topcoat. The two combined blade coating heads of the top coating section are respectively used for the front and back sides of the cardboard. 
At present, more and more factories choose FILM PRESS film press equipment for pre-coating. The advantage is that it can meet the high bulkiness of paperboard and can effectively prevent the trouble caused by the doctoring paper. Film presses are often used in the production of high-grade coated white and white cardboard. After pre-coating, two coaters are applied by top coat to achieve the desired physical properties of the paperboard surface. 
In the coating technology, the gap between China and foreign countries is narrowing. Some of the well-known coating machine manufacturers in China have been approved by domestic users for their high quality and service. At present, many cardboard factories in China have adopted the domestic three-pass blade coating process and have achieved success. I believe there will be greater progress in the future.
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