Offset printing: the sword is not old
Offset printing machines enjoy a high market share in the wine label printing market. A group of highly professional label printers such as Wanchang, Hailibao, Jinya, etc. have annual production capacity of more than billions of sets. Wine label printing favors offset printing for its subjective reasons: first, offset printing has exquisite printing quality, which is in line with beer consumers ’appreciation of external decoration; second, foreign offset printing machines have once entered the domestic printing market at low prices, which has satisfied the printing plant ’s The printing machine's price orientation is also adapted to the frequent reversion and short-term orders of breweries.
Objectively, offset printing still has unmatched advantages of flexo and gravure printing: not subject to batch restrictions, rapid plate change and low cost, suitable for processing small text, small dots and fine lines, overprinting is the best, and it is not picky about materials and inks. Many breweries do not limit the source of coated paper, and the loss of printing plants is controlled below 5%, so that the price of offset printing exerts the greatest advantage.
Non-environmental protection has always been a headache for traditional offset printing, and its non-environmental protection is mainly due to solvent-based inks with high volatility. News from the ink industry is undoubtedly good news for offset printing: the soybean ink introduced by the Japanese goddess and Osaka Offset printing is on the road to environmental protection. Li Renchao, Regional Sales Manager of North China, Shanghai Peony Ink Co., Ltd. (formerly Shanghai Ink Factory, the largest lithographic offset ink manufacturer in China) said, "Offset and offset inks will retain an application rate of about 40% for a long time. Domestic beer standards Rotary printing was once on the rise, but due to the fierce competition in the industry and frequent plate changes, it is still dominated by lithographic offset printing with a quick turnaround. "To meet market demand, offset press manufacturers and ink manufacturers are working on the green printing transformation of traditional offset printing .
Gravure printing: dominate
The beer cap label uses 99.5% pure aluminum foil. The advantages of the substrate are easy processing, good printability and laminating performance. Compared with the paper label, it will not affect the printing and labeling because of the silk flow; the appearance has the original natural The metallic texture and brightness are more eye-catching than any other material. They are like fine ornaments on the crown. They are integrated with the belly and back labels to create a perfect packaging for the brand beer. Aluminum foil can only be printed in the form of a roll, and thick ink is required to reflect the bright colors, so gravure printing has almost become the only way to mark. In order to improve the dyne value of the metal surface and ensure the fastness of ink and gloss, the gravure printing machine is generally equipped with a corona treatment device (coronatreatment). Following pure aluminum foil and sprayed aluminum paper, MEC (Metallic Effect Color) printing is a new way of manufacturing surface metallic effects. It is printed on wet-strength paper with a brightness of more than 80% by using a special PVD metal ink. The picture or text has a real strong golden or silver visual effect. The core technology of MEC is the development and application of metal effect pigments and inks, while gravure is the best process for printing metal effect colors.
The steel roller gravure printing plate made by laser engraving technology can transfer pictures and texts in a rich and thick way. The metallic ink can better highlight the bright effect only when the printing amount is heavy. Metal vision requires an ink layer to reflect, the amount of gravure coating up to 4 grams per square, and less than 2 grams of offset printing. Avery Dennison uses vacuum metallization technology to make thin and flat metal bright metal pigments. German ECKART uses it to process bright metal effect color inks. Its metal effect, stability and functionality are not only suitable for Printing on paper can also get a real shiny effect in surface printing. Using a photometer to measure brightness, hue and saturation (hue), the printing effect is very close to that of aluminized paper, but the cost can be reduced by 20%.
Flexo printing: rising star
According to Xi'an Heiniu Machinery Co., Ltd., there are currently two major characteristics of flexo printing machine sales: one is the introduction of the flexo printing machine as a must-have equipment; the other is that the purchased flexo printing machine originally printed card boxes and tissues , Now printing beer labels. In the past, many printing houses used offset printing to print wine labels, and after the technical transformation, they turned to flexo printing, including the printing plants under the brewery and independent social printing plants. Due to the large amount of beer standard, the operating rate of special equipment is higher than the national average level of flexo printing machines, which shows that flexographic printing has a place in domestic beer label printing. In addition to Yanjing, the beer industry, Qingdao, China Resources, Suntory, Le Cordon Bleu, Blue Sword, Yellow River and other well-known brands also began to use a large number of flexo labels, in line with the establishment of a conservation-friendly environmental economy.
The beer label adopts the unit type flexo printing machine for web printing, which has many advantages:
1. High-speed printing
The speed of the flexo printing machine can reach more than 100m / min, and the post-press processing device installed on the line can realize rapid embossing, bronzing and die cutting. This one-stop processing and molding method can better guarantee the supply of batch products, and its production efficiency is equivalent to two Roland 700 five-color offset printing machines.
2. Standard operation
Industrial products need to be standardized, and the label products of the front and back batches must be able to be produced with a unified color standard. Moreover, label products usually require many spot colors, and their sensitivity to color difference is quite strong. Flexographic printing transfers the amount of ink through the anilox. Once the anilox roller is selected, the color difference during the printing process is very small, reducing the operator's experience dependence.
3. Even spot colors
Label printing often uses spot colors to highlight brand characteristics, especially on large areas. The constant pattern transmission method can prevent the white leakage caused by uneven ink layer or dot loss; using the connection operation, the flexographic label appears saturated and bright in the color luster.
Flexo gravure offset printing: Trinity
How to change the characteristics of the paper through printing, so that the physical properties and cost accounting of beer labels are most suitable for labeling requirements? This exploration has allowed printers to shift their processes to mixed methods, installing flexo, gravure, and even offset printing on one line at the same time. The unit can meet the special requirements of the wine label such as anti-warping and anti-sticking, dry friction, wet friction and water resistance, while improving the efficiency of plate change and the economics of using the plate (such as flexo seams can be Eliminate 3% of paper saving in gravure) and the rationality of ink use (such as flexo gold ink 130 yuan / kg, gravure printing 60 yuan / kg, the latter printing effect is better). A number of Jielas narrow-format flexo printing machines equipped with offset and gravure printing units have been introduced in China, and attempts have been made to print high-end beer labels.
Breweries that use recycled bottles for filling also need to consider the efficiency of the bottle washer. Because offset labels are printed and polished with embossed labels, it is not conducive to the rapid penetration of lye and prolongs the dissolution time of the glue, which not only reduces the efficiency of the bottle washer, but also increases the amount of alkali consumption; offline glazing does not provide good resistance. Alkali protection, the ink will contaminate the bottle washing tank after being dissolved by alkali, which can not only wash bottles with pure water, but also increase the cost of bottle washing. The flexo and gravure printing process first prints and then embossed is more conducive to the rapid cleaning of the recycling bottle, to ensure that the ink is firmly attached to the label paper during the alkaline washing process, the label is off the bottle but the ink does not fall off, and will not pollute the lye.
Whether it ’s the old offset printing, the intaglio gravure printing, the rising flexo printing, or the exploratory combination of the three, each has its own advantages and irreplaceability. Choose the appropriate one according to the actual situation. The printing process is wise.
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