Suitability of the hottest bronzing and analysis o

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Applicability of bronzing and analysis of the reasons affecting the quality of bronzing

at present, the production of bronzing plates mainly adopts photographic corrosion process and electronic engraving technology, and the materials are commonly used as copper plate or zinc plate equipment consumables. Copper plate material is fine, and the surface smoothness and heat transfer effect are better than zinc plate. The use of high-quality copper plate can improve the gloss and outline clarity of bronzing pictures and texts, and the central printing. The traditional photographic etching technology is simple and low-cost, which is mainly used for text, thick lines and general images; For fine, uneven thickness bronzing plates, it is necessary to use secondary deep burn or electric engraving technology to print the market

the so-called bronzing suitability refers to the model selection of electrochemical aluminum and the matching between bronzing speed, temperature, pressure and other factors. When the equipment and other hardware are fixed, correctly mastering the bronzing suitability is the most important means to improve the bronzing quality. The following is an analysis of some quality problems reflected in the actual operation, so as to scientifically grasp the bronzing suitability printing alliance

1. There are many factors related to the printing market, such as the surface characteristics of printed parts, the properties of anodized aluminum, hot stamping temperature and pressure

too much powder is sprayed on the surface of the print or there are additives such as adhesive remover and gloss paste on the surface, which will hinder but the most basic principle is the same as that of the experimental machine, which will hinder the adsorption of anodized aluminum and paper for central printing. Solution: remove the powder on the surface or solve the printing alliance in the printing process. Improper selection of electrochemical aluminum directly affects the fastness of bronzing and printing in the middle. According to the size of the bronzing area and the characteristics of the materials to be bronzed, we should comprehensively consider what type of electrochemical aluminum equipment consumables to choose. Domestic electrochemical aluminum is mainly the peacock brand series produced by Shanghai Shenyong bronzing Materials Co., Ltd., while imported electrochemical aluminum is mainly the PM and LK series of Kurtz, Germany, the A, K, H series of Japan, and the SP series of printing tools of Kolon, South Korea. According to our practice and testing, the selection of anodized aluminum can mainly refer to the following categories: the gilding anodized aluminum on ordinary products has 88l type and Kurz PM type; There are 882 types of gilding anodized aluminum for thick ink printed materials such as cigarette bags and cosmetics (including gold and silver printing); There are 883, 884 types, pm288, etc. of electrochemical aluminum for fine handwriting hot stamping of cigarette labels, cosmetics packaging, etc; It is suitable for hot stamping of OPP or pet coated paper, cardboard with UV ink, polishing paper and other products. Anodized aluminum has 884 type, K series, LK series, and SP series printing technology. Failure to correctly master the bronzing equipment and the matching between the hot stamping time and the hot stamping temperature according to the segmentation of the target market of aluminum powder will affect the hot stamping fastness and the clarity of the picture and text outline. Due to different equipment and materials to be hot stamped, the pressing time and hot stamping temperature are different. For example, the high-speed rotary press is fast, the stamping line is in contact, and the hot stamping temperature is higher than that of the round flattening or flat flattening equipment consumables. Generally, the temperature of round pressing and hot stamping is 190 ℃ ~ 220 ℃, the round pressing is about 130 ℃ ~ 150 ℃, and the flat pressing is about 100 ℃ ~ 120 ℃ in the printing market. Of course, the hot pressing time, hot stamping temperature and production efficiency are also restricted by the transfer performance of anodized printing tools to a large extent

2. Reverse pull reverse pull refers to that after hot stamping, anodized printing should first consider whether the installation of the main part of the experimental machine is to brush ink vertically or polish the printed parts to pull away central China. The main reason for this is that the ink on the surface of the print is not dry or the post-processing treatment of UV on the surface of the print is improper, resulting in the equipment consumables caused by the weak combination of the ink and UV oil on the surface of the print and the surface of the paper. Solution: bronzing printing technology after printing is dry. In addition, it can be printed in the middle of electrochemical aluminum with low separation force and excellent heat transfer

3. Paste plate and anodized discoloration after hot stamping paste plate is mainly a printing tool caused by poor production of bronzing plate, loose installation of anodized plate or incorrect foil feeding of anodized plate. The discoloration of anodized after hot stamping is mainly caused by high hot stamping temperature, which causes equipment consumables. In addition, the wrinkling of anodized aluminum is also easy to cause uneven hot stamping and discoloration. It can be solved by appropriately reducing the temperature. Honeywell 1 has been actively developing R & D projects related to spectrum fiber and bulletproof materials. For the round flattening machine, a fan can be installed at the foil feeding place to keep the foil floating, so as to avoid the electrochemistry aluminum touching the bronzing plate and scorching the printing technology before hot stamping

4. Improper process arrangement destroys the surface gloss of electrochemical aluminum, and the picture and text outline makes the material market false. For bronzing that requires film covering processing, people often worry that the gold foil is easy to be wiped off and hot stamping before film covering, which is easy to cause:

① the film (especially the matte film) will damage the surface gloss of anodized aluminum, and it is not suitable to use water-soluble glue to cover the film, otherwise it will cause the surface of anodized aluminum to blacken, and it is very easy to cause the gold powder to stick to the edge of the picture and text, resulting in the phenomenon of virtual material market

② after bronzing, it is sunken due to pressure, and the glue is not easy to penetrate the surface of anodized aluminum, which is easy to cause the separation of OPP and paper at the bronzing place and affect the product quality and material market

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