Flexible foil aluminum foil gravure and coating quality (below)
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3. The effect of the hardness and pressure of the rubber roller in the coating device on the coating amount:
When the depth of the cell and the adhesive [concentration, density are determined, the coating amount of the anilox roller is also affected by the hardness and pressure of the rubber roller in the coating device. The requirement for the rubber roller is that the pressure on the left and right sides should be uniform. That is to say, when the rubber roller is manufactured, the rubber compound of the mixing torch must be uniform and the vulcanization conditions must be strictly controlled. The quality at any point is the same. If the rubber roller used is very soft, elastic, and the pressure on the roller is large, the amount of coating decreases, and vice versa. This is because the rubber roller squeezes into the depth of the anilox roller pocket under a heavy pressure, and the adhesive solution is driven out of the part to reduce the coating amount of the adhesive.
In actual operation, the pressure of the rubber roller to the anilox roller is controlled in the range of 2-3Mpa.
4. Effect of scraper's operation on coating amount in coating device 1) Squeegee pressure The current methods of adjusting the blade pressure device in the device include: tension spring pressure regulation, hand wheel pressure regulation, cylinder pressure regulation and pressure hammer pressure regulation. When the cloth is applied, the pressure of the doctor blade on the anilox roller is too small, and even if the blade is not pressed or mechanical impurities, the doctor blade will be topped up to cause a suspicious gap, so that the coating is uneven and the coating amount increases. The factors that affect the squeegee pressure are: different hard and soft blades, different angles between the squeegee and the anilox roller. In actual operation, the squeegee is used to adjust the scraper. The scraper pressure is generally about 200-400 Kpa.
2) The angle between the scraper angle scraper and the tangent of the anilox roller contact is generally between 15 degrees and 30 degrees. If the angle is too large, the doctor blade is almost against the anilox roller, and the surface of the anilox roller is not smooth. When it runs at a high speed, it will cause the elastic blade to vibrate or jump, causing the solution to be bouncing up, causing the coating to The uneven amount of cloth causes a large difference in coating amount. In addition, too large an angle can easily damage the blade.
3) Sharpness of the scraper The sharpness of the scraper mainly depends on the angle of blade wear and the purity of the solution and the quality of the knife. If it is a new knife, the sharpness of the knife should be to effectively scrape the adhesive layer on the anilox roller without producing a knife. If the sharpness of the knife is moderate, the solution layer can be scraped cleanly from the place of production to obtain a uniform coating amount, whereas the difference in the coating amount becomes larger.
4) Flatness of scraper The flatness of the scraper means that if the warpage is not generated, the coating amount is uniform, otherwise the difference in the coating amount becomes large. The flatness of the scraper depends on the method of installing the scraper. Of course, it may also be related to foreign matter stuck in the holder groove or on the blade and the lining. Therefore, the lining should be wiped when loading the knife, and then the new knife should be placed behind the lining. Into the tank. Rotary blade back screws should be tightened from the middle of the blade first, then gradually tightened on both sides, and both sides should be tightly rolled. In order to prevent the blade from twisting, it should be completed two or three times to tighten the screw. While turning the screw, clamp the blade and the lining with a piece of cloth and pull it tightly to one side. The knife thus formed is relatively flat. In order to ensure the difference in the amount of coating within the standard range.
5) Scraper's left and right movement The left and right movement of the scraper has an important effect on raising the scraping line, improving the utilization rate of the scraper, and reducing the wear of the anilox roller. From this point of view, the net wall wear is small, the net is relatively deep, and the fluid portion contained is contained. More than one, it is beneficial to achieve the required amount of coating.
3. Discussion on the optimal coating amount of aluminum foil substrate and adhesive The coated aluminum foil is heat-sealed with the PVC hard sheet, and the heat-sealed adhesive strength of the two is usually sealed with an adhesive layer. Intensity to measure. Is it better to apply the adhesive as much as possible during the printing and coating process? How much is the best adhesion effect? Physical tests show that the heat seal strength of aluminum foil and PVC is proportional to the coating amount within a certain range, but it is not proportional to a certain extent. In most cases, the coating amount is 3-6g/g. The cm square can meet the heat seal strength requirements. If the coating amount is increased, the value of the heat-seal strength increases to a certain value as the coating amount increases, the heat-seal strength curve tends to be balanced, and the strength change is small, so it is not necessary to increase the adhesive coating amount. It will increase costs.