It is suitable for manufacturing hot stamping film, laser film, gold and silver paperboard which need coating and laminating.
Development of coating technology
From the analysis of the development situation in recent years, the future development of coating technology may present the following three important characteristics:
l Scraper coating will remain the most important coating method for a period of time in the future, and is developing towards high speed and high solid content;
l The measurement method of measuring size and pressure is widely accepted and developed rapidly;
l New coating methods such as spray coating and curtain coating have received widespread attention, indicating a bright future;
However, the above developments are unlikely to be smooth and must face many technical challenges. High-solid-state blade coating can cause running problems such as scraper marks, large blade pressure, paint deposition on the blade (commonly known as turning) and blade wear. Metering size press coating must face high speed and high solidity. The problems caused by the coating of high content and high coating amount. It includes fog splashing at the exit of the coating roll nip, orange peel paper on the coated surface, etc.; the new coating method also solves the new problems that have not been encountered in conventional coating.
Common micro gravure precision coating method --
Micro gravure coating:
The coating roller is an anilox roller, and the diameter is generally between Φ20mm-Φ50mm, so it is called micro gravure coating, which is a direction, contact coating method, that is, the rotation direction of the micro coating roller and the film film. The feed direction is reversed and the film is not pressed onto the coating roll by the press rolls. Conventional gravure coating methods, whether direct coating or reverse coating, generally have a back pressure rubber roller and an anilox roller having substantially the same diameter as the rubber. Since the film is pressed between the rubber roller and the anilox roller, there is a possibility that defects such as wrinkles and cracks appear on the coated surface, and the pressure contact points of the two rolls affect the coating quality due to factors such as mechanical and pneumatic pressure.
While micro gravure coating is a contact coating, contact coating means that there is no back pressure rubber roller, and therefore some potential disadvantages due to back pressure roller pressurization are eliminated.
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