Aluminum foil production process

Metal foil was first used as a special beer bottle seal decoration and security change about 100 years ago, today's beer label packaging called the material of the material is actually a high content of pure aluminum, traditionally foiling (Foil) metal was once lead Or tin-plated lead, which is why the domestic aluminum foil label is still called the tin foil label. The advantage of aluminum foil is that it is easy to process, has good printability and fit properties, and does not affect the printing and labeling due to silk flow compared to paper labels.
After processing, the surface of aluminum foil has been treated with glazing, smooth, clean and bright. It is suitable for gravure gravure printing or flexographic printing. It is not limited by the color, pattern and design. It can also print special temperature sensitive inks to warn consumers Good drinking temperature; or increase the function of unscrew the cover, and pinch the hole line along the bottom of the bottle. When labeling, the labeling glue cannot be pasted under the pinhole line. If the top label goes straight, the pinhole tears accurately to indicate the bottle. The cover has been opened.
Beer aluminum foil top label, also known as cap label, with original natural metal texture, brightness, eye-catching than any other substrate, like **** on the beautiful jewelry, and abdomen, back standard seamless, to create a common brand The perfect beer. Many European and American high-end beers use aluminum foil caps, domestic 60% for 640ml, 630ml, and 500ml bottled aluminum foil. With total national total beer consumption and high-end beer growth at 15% and 10% respectively, it is expected that the next few years Aluminum foil prices are maintained at around 20%.
Aluminum Foil Application Performance The original aluminum foil used in printing plants is made of four standard aluminum ingot melting, hot-casting, coarse-pressing, and fine-pressing processes with a purity of 99.5%. The domestic beer sealing standard thickness is approximately 0.011mm. German wine labels Thin to double zero, ie 0.009mm. After the aluminum foil is formed, the surface layer lubricating oil is removed from the aluminum foil by means of evaporation. The grease is applied to prevent the foil from sticking during the roll pressing process, and no trace of oil remains on the surface of the finished foil. Otherwise, the adhesion of the printing ink will be affected. A corona treatment device is generally installed on the printer to increase the dyne value of the printing surface and increase the ink/glazing fastness.
After printing, the foil aluminum foil is embossed/punched, cross-cut, flattened, die-cut, or die-cut in several steps behind the packaging plant to produce the customer's desired shape. These mechanical processes affect the mechanical properties and processing performance of aluminum foil materials in different degrees. The optimization of wiring can reduce the damage to the tensile strength (Mpa) and elongation (%) of the aluminum foil, and finally ensure the labeling adaptability of the brewery.
The label factory adopts domestically produced downstream equipment, which is basically based on stand-alone operations. It consists of embossing boring machine, cross-cutting machine, flattening machine, die-cutting machine (vertical mark) and punching machine (special-shaped mark). Germany, Italy equipment only two production lines, embossing / puncture / cross / flattening, die-cutting machine (vertical standard) and slanting (profiled) on the same machine operation. On the one hand, the embossing functions as a label's aesthetics, flower-shaped worm-like, cup-shaped, etc., diagonal bar; on the other hand, helps the tightness of the aluminum foil stack, reasonable embossing depth and the process sequence of the first back hole can be After the aluminum foil is transectionally cut, it is closely attached like “butter”. There is no space formed between the single sheets of aluminum foil, so that the die/punching knife is sharp and straight, thick and straight. The pinhole size, density, and evenness affect the tensile strength and the distribution of the labeling glue, but mainly affect the drying time of the labeling glue. The brewery requires that the moisture released from the label through the pinhole is the fast drying period after labeling. 4 days.
If the brewery is filled with recycled bottles, the efficiency of the bottle washer must be considered. Aluminum foil chemical properties are reflected here. The commonly used bottle cleaning agent is a 1% sodium hydroxide solution supplemented with various additives, which can completely dissolve the aluminum, metal salt, copper, zinc and other metal objects from the glass bottle decoration. The pinhole should ensure that the lye is fast in a few minutes. Penetrate the inner layer of the label to allow it to peel off from the bottle and melt within minutes. The use of high-quality ink and water-based varnish can reduce the contamination of cleaning lye, ensure that there is no scaling in alkali tanks, no toxic waste water, and the minimum amount of chemical additives. In addition to the regular slag removal, the bottle washer does not need to change the lye frequently, and the brewer usually exchanges liquid once or twice a year.
The aluminum foil labeling property burst pressure is the main strength index of the aluminum foil cap label, and the high quality label can adapt to the labeling speed of 100,000 bottles per hour. The imported Pechiney pinhole free aluminum foil burst pressure is greater than 55kPa, domestic high quality aluminum foil such as Xishun, Bohai, Northwest aluminum is not less than 42kPa; import aluminum foil arch height is greater than 4mm, domestic aluminum foil is slightly lower than 4mm; high density micro pinhole aperture is 7um × 8um, to facilitate the rapid solidification of glue, so that aluminum foil in the bottle better positioning; embossing The structure adopts paper roller or steel roller, and the embossing depth is moderate, and the strength of aluminum foil must not be affected.
The finished aluminum foil has 15 conventional shapes that are basically changed in size from the square, T, and waist shapes. The glass bottle mouth is a misshapen and irregular shaped part. After the sealing, the skirt of the skirt of the skirt has an irregular angular corner, and the special-shaped bottle mouth and cap ring increase the difficulty of cap fitting.
The labelling effect of bottled beer is determined by a number of factors, including labeling technology (labelling machines), operators, bottles, adhesives, and label quality. The labeling process is that the rubber roller and the scraper cooperate to form a film of a certain thickness on the rubber roller, and when the target plate passes the rubber roller, the adhesive is applied and a tag is stuck in a rolling manner when the front end of the standard box is rotated; The target plate continues to move, and the uncovered label of the exposing barrel is peeled off by gripping the side edge of the label, and the aluminum foil is pressed by the pressure-marking sponge when the receiving tube is turned to the side of the turntable.