Manufacturing process of the hottest aluminum foil

Production process of aluminum foil label

metal foil was first used as the sealing decoration and anti-counterfeiting display of special beer bottles. About 100 years ago, the material called foil in beer label packaging today is actually pure aluminum with high content. Traditionally, the foil metal used to be lead or tin plated lead, which is the reason why aluminum foil label is still called tin foil label in China. Aluminum foil has the advantages of easy processing, good printability and bonding performance, and will not affect printing and labeling due to silk flow compared with paper labels

the surface of processed aluminum foil has been polished, flat, clean and bright. It is suitable for intaglio or flexographic printing on reels. It is not limited by color, pattern and design. It can also print special temperature sensitive inks to warn consumers of the best drinking temperature; Or add the function of visible replacement of unscrewing the cap, and tie a pinhole line along the lower part of the bottle mouth. When labeling, the label glue cannot stick to the lower part of the pinhole line. If the top label is torn accurately along the pinhole, it indicates that the cap has been opened

beer aluminum foil top label, also known as cap label, has the original natural metal texture and brightness. The electronic tensile testing machine is a mature tensile testing machine with the highest scientific and technological content at present. Its eye-catching performance is higher than that of any other substrate, just like the exquisite jewelry on the crown, which is integrated with the abdominal label and back label to jointly create the perfection of brand beer. Many high-end beers in Europe and the United States all use aluminum foil cap labels. Domestic 640ml, 630ml and 500ml bottle aluminum foil labels now account for 60%. With the total consumption of beer in the country and high and middle end beer increasing by 15% and 10% respectively, it is expected that the aluminum foil labels will rise and maintain at about 20% in the next few years

application performance of aluminum foil

the original aluminum foil used by the printing factory is processed by the aluminum foil factory through the four processes of melting, hot casting, rough pressing and fine pressing of the standard aluminum ingot with a purity of 99.5%. The thickness of the domestic beer sealing label is about 0.011mm, and the German wine label is thin to double zero, that is, 0.009mm. After the aluminum foil is formed, the surface lubricating oil is removed from the aluminum foil by evaporation. The purpose of coating grease is to prevent the foil roll from sticking during the rolling process. The surface of the finished foil can't leave any traces of oil, otherwise it will affect the adhesion of the printing ink. Corona treatment is generally installed on the new gravure press to improve the cause value of the printing surface and increase the ink/glazing fastness

the printed roll aluminum foil needs to be embossed/perforated, cross cut, flattened, die-cut or punched into the standard shape required by the customer by another photoelectric switch. These machining processes affect the mechanical and processing properties of aluminum foil materials to varying degrees. The wiring optimization operation can reduce the damage to the tensile strength (MPA) and elongation (%) of aluminum foil labels, and finally ensure the labeling adaptability of breweries

the label factory adopts domestic back track equipment, which is basically single machine operation, including embossing and hole tying machine, cross cutting machine, flattening machine, die-cutting machine (right angle mark) and punching and cutting machine (special-shaped mark). German and Italian equipment only need two production lines, embossing/punching/cross cutting/flattening, die-cutting machine (right angle mark) and oblique punching (special-shaped mark) operate on the same machine. Embossing, on the one hand, plays the aesthetic function of labels. The flower shapes include vermicular, cup-shaped, diagonal bar shaped, etc; On the other hand, it is conducive to the tightness of aluminum foil stacking. The reasonable embossing depth and the process sequence of first embossing and then hole can make the aluminum foil stick closely like "butter" after transverse cutting. There is no space between single aluminum foil, so that the die/punching blade is straight and thick. The size, density and evenness of the pinhole affect the tensile strength and the distribution of the label, but mainly affect the drying time of the label. The brewery requires that the fast drying period of water released from the label through the pinhole is 2 ~ 4 days after the label is affixed

if a brewery uses recycled bottles for filling, it must consider the efficiency of the bottle washing machine. The standard chemistry of aluminum foil is reflected here. The commonly used bottle cleaning agent is 1% sodium hydroxide solution supplemented by various additives, which can completely dissolve the aluminum, metal salts, copper, zinc and other metals from the decoration of glass bottles. The pinhole should ensure that the lye can quickly penetrate into the inner layer of the label in a few minutes to peel it off from the bottle and dissolve in a few minutes. The use of high-quality ink and water-based varnish can reduce the pollution of cleaning lye, ensure that there is no scaling in the alkali tank, no toxic waste water and the minimum amount of chemical additives. In addition to regular slag removal, the bottle washing machine does not need to change the lye frequently. The brewery generally changes the lye 1 ~ 2 times a year

aluminum foil label labeling attribute

bursting pressure is the main strength index of aluminum foil cap labels. High quality labels can adapt to the labeling speed of 100000 bottles per hour at most. The bursting pressure of imported Pechiney pinhole free aluminum foil is greater than 55kpa, and the bursting pressure of domestic high-quality aluminum foil such as xiashun, Bohai and Northwest Aluminum is not less than 42kpa; The arch height of imported aluminum foil is more than 4mm, and that of domestic aluminum foil is slightly less than 4mm; The aperture of high-density micro pinhole is 7um × 8um, which is convenient for rapid solidification of glue and better positioning of aluminum foil on the bottle; The embossing structure adopts paper roller or steel roller, and the embossing depth is moderate, which shall not affect the strength of aluminum foil

there are 15 conventional shapes of finished aluminum foil, which basically change in size from square, T-shaped and waist shaped. The glass bottle mouth is a convex part, and we must follow the uneven concave part of the step. After sealing, the skirt of the crown cap forms an irregular angular ring, which increases the difficulty of fitting the cap label

the labeling effect of bottled beer is determined by many factors, including labeling technology (labeling machine), operators, wine bottles, adhesives and label quality. The labeling process is that the rubber roller and scraper cooperate to form a certain thickness of rubber film on the rubber roller. When the standard plate passes through the rubber roller, glue it and roll it out in the form of rolling when turning the front end of the label box; The label plate with the label continues to move, and the label is removed by clamping the side edge of the label with the opening and closing finger of the label removing cylinder. When the label receiving cylinder turns to the side of the bottle supporting turntable, the aluminum foil label is pasted on the bottle mouth through the label pressing sponge (the body label is pasted at the same time); The labeled bottle will rotate 90 degrees with the tray while moving forward with the bottle supporting turntable, and the label will be brushed flat when passing through the label brushing group; Finally, go to the star wheel to flatten the top part of the cover. The aluminum foil label is in contact with the label box, label plate, label uncovering cylinder, rubber plate, label brush, label pressure and other labeling units on the labeling machine, and is pasted and sealed on the bottle mouth after bearing multiple movements and pressures. The aluminum foil label shall be pasted correctly, flat, aligned with the body label, without scratch, wrinkle or damage, and without glue trace

domestic breweries are increasingly using high-speed labeling machines, and aluminum foil labels should be able to meet the labeling speed of at least 40000 bottles per hour. Because the surface of the standard plate will be worn under high-speed and extensive use, resulting in incorrect marking or uneven gluing defects; The uneven thickness of the cross section of the standard plate will make the label and the bottle fit poorly, resulting in wrinkling or foaming. Accordingly, the beer packaging workshop needs regular maintenance and replacement of the standard plate. Solid caking on the surface of the glue brush will also make the glue surface uneven. It is necessary to clean the glue brush every day and check or replace it regularly

the labeling efficiency of aluminum foil label is closely related to the overall dimension, punching quality and embossing depth of the label. When the overall dimension deviation is too large, it is impossible to realize mechanized labeling at all, and the label is either stuck in the label box or falls out from the front of the label box; Poor punching quality will make the label overlap and adhesion, resulting in difficulty or failure of label taking. Through visual inspection, it can be seen that the surface of the good label is smooth and tidy. Improper embossing test should meet the conditions that will reduce the strength of aluminum foil. Generally, breweries are not equipped with embossing depth detector, and the theoretical formula is: depth = (M × 10000)/(F × 2.7), M represents the weight of aluminum foil, and f represents the square centimeter area of sample standard

the market prospect of aluminum foil for packaging is broad.

with the rapid development of China's national economy and aluminum processing industry, aluminum foil for packaging has become one of the most important consumption growth points in the aluminum foil market. At present, China's annual consumption of aluminum foil is up to 161300 tons, which has become the world's second largest consumer of aluminum foil after the United States. However, the per capita share still lags far behind that of developed countries. In particular, the consumption of aluminum foil for packaging is relatively limited, which has broad development space

air conditioning foil is the product with the largest consumption in China's aluminum foil market; The second is cigarette foil. As the world's largest cigarette producer and consumer, China's annual consumption of cigarette packaging cigarette foil reaches 35000 tons, accounting for about 60% of the total consumption of double zero foil; The third is decorative foil, which is mainly used for heat insulation, moisture-proof and decorative materials. At present, decorative foil is increasingly widely used in China's construction and home appliance industries; The fourth is cable foil, which mainly uses the tightness and shielding of aluminum foil as the protective layer of cable. The above four aluminum foil consumption accounts for more than 70% of China's total aluminum foil consumption. Apart from cigarette packaging, the applications of aluminum foil in the packaging industry mainly include: aluminum foil cap labels for high-end beer, aluminum plastic composite bags, aluminum foil blister packaging for drugs and chocolate packaging

according to statistics, there are 83 aluminum foil production enterprises in China, with an annual production capacity of about 235000 tons. Although some enterprises have some modern production equipment, most aluminum foil production enterprises are small in scale, and there is still a big gap in equipment and process level compared with developed countries, with more medium and low-grade products and less high-end products. Therefore, from the perspective of development prospects, China's aluminum foil market has a lot of room for development, both in terms of consumption and product grade