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What are the common problems in beer label printing

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Hangzhou Datang printing answers: at present, China’s beer labels mostly use 65-80g /m2 single-sided coated paper. Wet strength paper and aluminum spray paper are printed by offset printing and gravure printing. The label quality is related to the fiber direction of the label paper. Flatness and moisture content. Dimensional stability, crimping time and other factors
the specific requirements are that the paper fiber direction is perpendicular to the axial direction of the bottle body; The water content is about 5% ~ 7%; When the humidity is 40% ~ 80%, the single label shall be kept flat; The crimp height of the front and back sides shall not be greater than 3mm; The time for the back to curl into a barrel in case of water shall be greater than 8 seconds. In addition to the above elements, the printing quality should meet the requirements of wine label, otherwise it will bring difficulties to labeling
quality problems and causes in beer labeling
1. Uneven glue brushing (there is glue on the upper and lower sides, no glue in the middle, or there is glue in the middle and no glue on the left and right sides). The main reason is that the beer label paper is not flat, and the height of positive and negative curl is greater than 3mm
2. The sheet is lost when the bid is taken. The main reason is that the curl height on the front of beer label paper is greater than 3mm, and the air cannot enter between the bid and the label in the labeling process. When taking the label, there are two or more labels
3. The label is pleated or tilted (it is good when sticking the bottle, but the four corners of the label are tilted during transmission). The main reason is that the moisture content of label paper is low and it elongates rapidly in case of water
at present, the technical level of most printing plants can meet the appearance requirements of beer labels. How to control the internal quality of beer labels and meet the labeling requirements is the focus of the process. From the above analysis, it can be seen that the main reason for the problems of beer label curling and warping angle is the low moisture content of beer label paper. If the printing method is different from the post press processing method, the printing quality needs to be controlled by controlling the moisture change of beer label paper
the change of water content of beer label paper in different printing methods
1. Offset labels are printed by single sheet, monochrome or multiple overprint. The ink drying is mostly natural conjunctival solidification. Due to the balance of water and ink in offset printing, the water content of label paper is basically the same as that of printed products
2. Gravure labels are completed by pre drying, continuous multi-color overprint and winding of web paper. After each color printing, the ink is dried by drying and solvent volatilization. The labels will lose water after drying for many times
according to the law of “paper moisture elongation, drying shrinkage”, offset labels are printed under the condition of “paper elongation”, while gravure labels are printed under the condition of “paper shrinkage”. Therefore, if the processes of gravure printing beer labels are not well mastered, the finished products will curl due to humidity, resulting in labeling failure. How to solve the problem of water content change of gravure beer label to meet the labeling requirements of wine bottles? You may wish to pay attention to the following points
precautions for gravure printed beer labels
1. Rewetting: restore the moisture content of label paper after printing
2. setting: adjust the amount of water supplied according to different paper properties in the process of rewetting;
3. Leveling: the finished single sheet after web cutting shall be leveled
4. Maintain the air humidity in the production workshop.

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