The main coating methods of silicone oil on the bottom paper of security label stickers are: gravure coating method and offset gravure combined coating method.
The main coating methods for security label adhesives are roll coating, scraper coating or Comma coating and flux coating. The following introduces two advanced coating methods in the world.
Glue-concave silicon coating method. This method is used for solvent-free silicone oil anti-counterfeiting label sticker coating.
The principle is: the silicone oil is taken out of the container by the gravure roller, and the excess silicone oil is removed on the surface by the ink scraper. The gravure roller transfers the silicone oil to the rubber roller, and the rubber roller evenly spreads the silicone oil on the surface of the anti-counterfeiting label sticker bottom paper.
Because the mesh size on the gravure roller is uniform, the amount of coating of silicone oil on the anti-counterfeiting label sticker is very uniform and consistent. Bottom paper scraping square extrusion silicone adhesive coating head.
Security label sticker adhesive flow coating method. It can avoid other coating methods caused by scratches on the surface of the glue, the production of bubbles and other defects.
The principle of the flow coating method is: the cavity of the coating head is injected with adhesive by pressure, and the top is an adjustable size slit. When coating, with the operation of the anti-counterfeiting label sticker bottom paper, the adhesive evenly flows out of the thin slit of the coating head and is coated on the surface of the bottom paper.
The amount of anti-counterfeiting label sticker coating can be controlled by adjusting the size of the fine seam, or by adjusting the pressure in the cavity to change the flow speed of the adhesive, so as to change the amount of coating. When the viscosity of the adhesive changes, the overall coating weight of the adhesive can also be maintained by adjusting the pressure.
The high - grade casting coater is controlled by computer, which can detect and change various data by fluorescent screen. Infrared scanning sensor at any time will be coating thickness information feedback to the computer, the computer analysis and processing automatically adjust the corresponding data, so as to ensure the anti-counterfeiting label adhesive coating quality.
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