Experience of the most popular genuine product rat

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Experience of genuine product rate of aluminum foil packaging printing

with the widespread application of aluminum foil packaging printing products, the issue of genuine product rate of aluminum foil printing has caused several disputes in the printing industry. 4. Sheet metal. With this problem in mind, the author has gained a lot by communicating and practicing with the bosses of packaging and printing enterprises, especially the operators, in Shanghai, Wuxi, Suzhou, Heze, Jining, Zhengzhou, Xinxiang, Zhenjiang and other places. Now, the practical experience of each factory is summarized into this article for discussion with colleagues in the field

nowadays, most packaging and printing manufacturers choose 0.001 ~ 0.009mm pure aluminum foil as composite materials for printing. For example, when printing beer trademarks, they mostly choose 0.0115mm pure aluminum foil. The commonly used 0.007mm aluminum foil has about 500 ~ 600 tiny pinholes per square meter (the pinholes will disappear only when the thickness reaches 0.02mm). Although the thickness is different, the tensile strength is almost the same, while the moisture permeability (%/m2.24h) is different. In order to improve the genuine rate of packaging and printing products of pure aluminum foil, it is necessary to require a certain amount of automotive non-metallic materials, which will also increase the mechanical properties, while maintaining a certain softness, but the main parameter that directly affects the genuine rate is the strength of aluminum foil. In addition, there are also technological process problems such as normal temperature printing, normal temperature glazing, normal punching, embossing and slitting, flattening, no color fading after die breaking, no knife damage, neat cutting and packaging. Secondly, the products need to be able to withstand high temperature (150 ~ 180 ℃) after printing. Even at 180 ~ 250 ℃, the final products are required to achieve constant color, no fading and no fading under the normal temperature conditions without changing the production process and adding auxiliary equipment. At present, it has become a very urgent and urgent technical problem in the packaging and printing industry

in addition, the factor that affects the genuine rate of packaging and printing pure aluminum foil is die cutting fading, that is, the brittle and hard ink film of printing ink or the oil film of post press polish will lead to the frequent occurrence of this fault. Second, irregular die cutting and even damage the die knife, that is, the ink film of printing ink or the oil film of post press polish is too soft, which will also directly cause the adhesion and scrap of aluminum foil

in order to solve and avoid the problems caused by the strength of pure aluminum foil, we found that there was a difference between the transverse and longitudinal strength after the transverse and longitudinal inspection of the aluminum foil of the drum. For example, when the strength of the original aluminum foil is in the transverse direction, the breaking force is 15.066, 15.361 after printing, the breaking strength is 1.0044, 1.024 after printing, the deformation rate is 5%, and 4.6% after printing; The longitudinal breaking force is 15.764, 16.576 after printing, the breaking strength is 1.051, 1.106 after printing, the deformation rate is 3.9999%, and 4.2% after printing. For another example, the strength of aluminum foil after embossing is that the transverse breaking force is 9.069 (longitudinal 10.25), the breaking strength is 0.6046 (longitudinal 0.6833), and the deformation rate is 3.9999% (longitudinal 3.9999), as well as the strength of breaking force, breaking strength, deformation rate and so on after embossing different patterns and punching different numbers of large and small holes. We should have a clear understanding of the production process requirements in packaging and decoration design, photographic plate making, printing cutting and trademark pasting. For consumer users, horizontal operation method can be adopted when labeling (because the horizontal breaking force is higher than the vertical breaking force) to ensure the strength of aluminum foil printed products. It is also required that our decoration designers, photographic plate makers and printers always work in the direction of packaging and printing according to the four commonly used widths: 10 ~ 39mm, 39 ~ 130mm, 130 ~ 220mm and 220 ~ 600mm, so that the later cutting and labeling processes are consistent. In short, in reducing the scrap rate, improve the genuine rate and reduce the consumption cost of aluminum foil packaging and printing

in addition to the matters needing attention in the above process flow, we should not underestimate in the embossing (embossing depth and pressure, punching size, and quantity are only a general indicator) pressure equality process flow

the variety and quality of inks, the variety and quality of varnishes, and the temperature tolerance used in the printing of EPDM with a minimum density of 1.1 should strictly refer to the technical parameters of these products. In the future, it may be as thin as the hotel room card, and attention should be paid to the actual technical parameters in the prepress trial production (under the conditions of environmental temperature, environmental humidity, thickness, width, printing speed, etc.), Only by strictly controlling the quality of aluminum foil in the process of packaging and printing can we achieve a high rate of genuine products

Liu Jiaju

source: China packaging 2005/2

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