Coating bubble-free coating method and device

Abstract

The invention relates to coating equipment used in holographic anti-counterfeiting printing industry, in particular to a coating bubble-free coating method and a coating bubble-free coating device. The invention aims to provide the coating bubble-free coating method and the coating bubble-free coating device, which can realize bubble-free coating and improve product quality. In the invention, a transfer barrel is arranged in front of a material tank, coating material liquid is pumped into the transfer barrel from a material barrel by an air pump, air bubbles generated in the coating material solution are suspended above the liquid level in the barrel, the transfer barrel stores material solution and keeps the material solution at a certain height, the transfer barrel is communicated with the bottom of the material tank through a feeding pipe with a feeding valve, an overflowing pipe with an overflowing valve is arranged between the transfer barrel and the material barrel, and based onan objective law that light air bubbles in the coating naturally float up, so as to be stored on the surface of the coating solution in a floating manner; and as a result, the cost, equipment investment and energy consumption are reduced. The equipment has the advantages of obvious energy-saving effect, simple structure, low cost, wide application range, high efficiency, convenient installation, operation and maintenance, and high environment friendliness.

Description

technical field [0001] The invention relates to a coating equipment in the holographic anti-counterfeiting printing industry, in particular to a method and device for foam-free coating of coatings. Background technique [0002] At present, in the field of holographic anti-counterfeiting printing technology, when the existing coating machine is in large-scale production, the uniformly stirred coating material liquid is pumped from the coating storage tank into the rectangular coating machine trough by an air pump. In some cases , will generate bubbles on the surface of the material liquid in the coating machine trough, and it is difficult to eliminate. Such a cycle will easily cause a large number of bubbles in the coating. During the coating process, these bubbles cannot be eliminated by themselves, making the coating machine trough The paint inside has a lot of bubbles and spreads out, floating on the material liquid, and the coated mesh roll will bring bubbles, because the...

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Problems solved by technology

[0002] At present, in the field of holographic anti-counterfeiting printing technology, when the existing coating machine is in large-scale production, the uniformly stirred coating material liquid is pumped from the coating storage tank into the rectangular coating machine trough by an air pump. In some cases , will generate bubbles on the surface of the material liquid in the coating machine trough, and it is difficult to eliminate. Such a cycle will easily cause a large number of bubbles in the coating. During the coating process, these bubbles cannot be eliminated by themselves, making the coating machine trough The paint inside has a lot of bubbles and spreads out, floating on the material liquid, and the coated mesh roll will bring bubbles, because the surface tension with bubbles is different from that without bubbles, resulting in The thickness of the coating on the belt is uneven, and the result is that the leveling property inside the coating is not good. The air bubbles in the coating are coated on the substrate with the anilox roller, forming a coating with bubble marks or uneven and smooth coating, and , the above-mentioned defects will become serious with the increase of coating speed, forming a large number of serious quality problems in products, product quality will decline, and a large amount of coating materials will be wasted, which will also affect the quality of the next process

In order to avoid air bubbles affecting the coating effect, people first thought of using defoamers. For a long time, people have devoted themselves to researching chemical additives to inhibit the generation of air bubbles or eliminate air bubbles, but so far only a few antifoam agents are suitable, and their prices are relatively expensive. , and will increase production costs, affect product performance and other issues, in addition, without the introduction of defoamers, such as the patent No. method, the investment in vacuum equipment can be imagined, the investment cost and operation consumption cost of the equipment will be greatly increased, and there are problems that cannot be underestimated; there is also patent 200920095730.9, the patent name is a combined defoaming and defoaming device, which is an additional The vertically placed wavy diamond-shaped mesh device breaks the foam and adds a filter, but the filter may not be able to completely eliminate the air bubbles. How to really reduce and eliminate the air bubbles fundamentally, and how to achieve reduction without increasing or increasing the cost And eliminate air bubbles, reduce energy consumption and other issues need to be further studied and solved, in order to develop a more reasonable, better energy-saving non-foam coating device, to achieve non-foam coating

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