Precautions for beer label printing process
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At present, the printing methods of beer trademarks in China are mainly three kinds of printing methods: offset printing, gravure printing and flexo printing. The advantages and disadvantages and precautions of these are discussed separately.
First, offset printing
Offset printing is a relatively mature printing method. It has the advantages of high registration accuracy. Therefore, some products in the beer trademark that have low output and high registration accuracy are generally used in this printing method. But you need to pay attention when printing:
1. Graphic design consumers' recognition of a product is first through the trademark, which requires the brand to have a bright color to achieve a striking feeling. Therefore, when designing the beer trademark, it should try to have a strong visual impact. The color of the force, the content design of the trademark should be based on the field, lines, and text as much as possible, and strive to be simple and clear, reduce or discard too fine overprinting, overprinting, and should also consider trapping technology in production, thus avoiding Direct buckles appear in the printing to improve product quality and pass rate. In addition, because the production environment of beer is very humid, and the lateral deformation of the paper is greater than its longitudinal deformation, it should be plated according to the correct plate making method to ensure that the left and right direction of the beer trademark is consistent with the direction of the paper and paper, so that the trademark can Firmly attached to the surface of the beer bottle, the labeling damage is effectively controlled.
2. Selection Requirements for Printing Materials Due to the high printing requirements of trademarks, the following factors should be fully considered for the selection of consumables such as paper. First of all, it should be considered to select paper such as single-sided coated paper with high surface smoothness to ensure the color stability and brightness of the trademark. Secondly, the paper should be considered for the water permeable time. Since the beer labeling generally uses water-soluble adhesives, and the beer production line has a speed of 30,000 to 40,000 bottles/h, the trademark has just been pasted onto the beer bottle. Collision, so that some trademarks with too short water permeable time are very easy to break, so we need to observe the beer labeling to get the time to break the label after labeling, as a reference for the paper selection factor. In addition, the paper is printed by offset printing, and the printing principle of the offset printing is ink balance, which causes the paper to have inconsistency in the performance before and after printing. Therefore, when checking the water permeable time of the paper, it is also necessary to consider the water permeability of the paper in printing. influences. In addition, the whiteness, opacity and mechanical strength of the paper should be paid attention to when printing the trademark. Only the whiteness and opacity of the paper can ensure the bright and uniform color of the trademark. Only good mechanical strength can ensure that the paper does not tear when printing at high speed. The selection of the ink should ensure high adhesion, and the ink selected by the trademark printing, especially the beer trademark printing, should also have light fastness to ensure the vivid and long-lasting color of the beer trademark.
3. The high precision of the printing process is a great advantage of offset printing. However, because the printing principle of offset printing is ink-and-wash balance, the influence of paper on the overprint after water-jet deformation in printing should be considered in the arrangement of color sequence. Sometimes, the deformation caused by the water absorption of the paper can be used to specifically format the color sequence to ensure the accuracy of the overprint. In addition, it is necessary to ensure that the temperature and humidity of the printing environment are constant during printing. Generally, the temperature is controlled at about 25 ° C, and the humidity should be higher than 55%. Pay attention to the drying of the ink when printing vacuum aluminized paper, especially to control the balance of ink to ensure the consistency of the ink.
Second, gravure
Gravure plays a big role in trademark printing, but it is not suitable for short-run printing because of the long gravure platemaking cycle and high cost. In view of the long storage time of the gravure plates and the high print durability, it is suitable for printing long plates and prints that require frequent brushing.
With the increasing demand for beer packaging grades, more and more beer began to use the top mark printed by pure aluminum foil. At present, in China, the beer top mark mainly adopts the gravure printing method. The factors that need to be paid attention to when applying gravure printing of pure aluminum foil top labels are as follows: Firstly, because the gravure printing method is directly inked by the gravure printing plate and the squeegee, and the capillary phenomenon between the printing plate and the substrate is transferred. To the substrate, so the viscosity of the ink is extremely strict, it must be ensured that the viscosity of the ink during the printing process should not be too large, otherwise it will affect the consistency of the color of the printing, the general speed is 30 ~ 80m / min, The ink viscosity is controlled at 16 to 22 s, and the machine speed is 80 to 120 m/m1 n. The ink viscosity is controlled at 12 to 16 s (using the No. 3 Chaen Cup test at 25 ° C); in addition, since the pure aluminum foil is metal, no absorption. Therefore, the drying of the ink must be ensured. During the printing process, the hot air volume and temperature should be strictly observed to ensure the ink is quickly dried, and the solvent is added regularly in the ink to ensure the drying and viscosity of the ink, and also pay attention to the ink. Friction resistance. Since the pure aluminum foil top mark directly wraps the bottle cap and the bottle neck of the beer directly, this requires that when the beer is drunk, the remaining top mark cannot be broken after the bottle is opened, and the pure aluminum foil scrap is prevented from polluting the wine body. To achieve such a requirement, the first selection of materials should not be too brittle; secondly, strict technical requirements are required in the post-processing of the products to ensure the uniform spacing and pressure during embossing of the holes.
In addition, when applying pure aluminum foil for beer top mark printing, the requirements for ink are very strict, mainly as follows: 1. The adhesion fastness of the ink must be high. Generally, the ink adhered to the surface of the aluminum foil by tape is preferably not faded. 2, the gloss and vividness of the ink should be high; 3, the smoothness of the ink should be suitable, because the excessively high smoothness will cause inconvenience to the coding process in the top mark processing and labeling process, and too low The smoothness of the top marks will cause the sticking of the top mark to cause the labeling efficiency to decrease; 4. The ink has high water resistance and frost resistance to ensure that the top mark does not appear at low temperatures.
Third, flexo
Flexo printing has the advantages of uniform color, wide substrate, and in-line processing. With the wide application of water-soluble inks, flexo printing has also been given the title of green printing. At present, many beer trademarks have adopted flexographic printing, and the newly emerging self-adhesive beer trademark has also adopted flexographic printing.
The factor that plagues the development of flexo printing is that there is a certain gap between the printing registration accuracy and the offset printing. If the plate making precision is not very high, it is difficult to produce a fine dot printing plate. Therefore, the beer trademark printed by flexographic printing is in graphic design. Try to ensure that text, lines, and the field are the main ones. In addition, since flexographic printing is mainly based on solid printing, attention should be paid to printing of absorbable substrates (especially with unit-type flexo printing). When the machine is printing, the impression of the printed product caused by the pumping up is inaccurate. To compensate for such phenomena in the printing process, generally, when the film is made, the compensation method such as increasing trapping should be considered. When printing the color sequence, you should also pay attention to placing large-area solid units in the color group behind the printing unit. When applying the flexographic printing method, the market should also consider the requirements of the market for trademarks. In the market, the storage of beer is generally in the water or in the refrigerator, so the trademark is required to be waterproof and antifreeze. Generally, the trademark is glazed to meet such requirements. In addition, the water resistance and frost resistance of the ink and the varnish are strictly checked to ensure that the ink does not fail at a low temperature and the trademark is discolored. Also, when using the flexo mark printed by the water-soluble ink, it is necessary to pay attention to prompting the user to select a suitable labeling paste, because the water-soluble ink is soluble in the strong alkali solution, so the alkaline should be paid attention to when selecting the labeling glue. Do not be too strong to avoid the appearance of trademarks. Flexographic printing is also very strict on the temperature and humidity requirements of the environment. Under normal circumstances, the temperature is maintained at about 25 ° C, and the humidity is stable at more than 60%. In addition to good surface smoothness, high whiteness, and strong opacity, flexo printing requires good mechanical strength and relatively stable rewinding tension to ensure reel The quality of paper in the beer label printing process is stable.
At present, the three printing methods are widely used in beer trademark printing, but the three printing methods have their own advantages: the offset printing cycle is short and the cost is low, and the registration accuracy is high, but after the finished printing, especially the vacuum aluminum-plated paper is printed, Due to the influence of the drying method of the ink oxidized and conjunctiva, it is generally required to be processed and labelled after 8 to 10 hours after printing. Therefore, it is generally suitable for printing short plates and printing with higher registration accuracy; gravure printing is gorgeous However, the plate making cycle is longer and the plate making cost is higher, so it is generally suitable for printing long-length printing products, especially the pure aluminum foil top label; the flexographic printing cycle and the cost are between offset printing and gravure printing, but the flexo printing can be processed online. The printing substrate is widely used. After the sleeve technology is adopted, the paper utilization rate is high, so it is generally suitable for printing long-length printing products and special-shaped trademarks.