The most popular choice of shrink label printing i

2022-08-03
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Choosing shrink label printing ink requires understanding that in recent years, the annual output of Chinese beverages has shown a trend of increasing year by year, maintaining a growth rate of 10% ~ 20% every year. According to statistics, its total output in 2005 was close to 30million tons. In 2006, the output of many beverage enterprises increased by 40% ~ 50% over the same period last year. It can be said that the beverage industry is one of the fastest growing industries in the food industry. In this huge market cake, fruit juice drinks account for about 10% and tea drinks account for about 15%. Various beverage production giants have rushed to the beverage market. Uni president, Huiyuan, Master Kang, Pepsi Cola, Coca Cola and Nongfu mountain are mainly applicable to measuring the impact toughness of plastic, rubber and other film materials and metal foil materials. Spring, robust and Yinlu have launched their latest types of beverages. The beverage industry is so hot. As a shrink label to highlight the brand image, it naturally benefits a lot. It is all kinds of shrink label printing inks that realize the exquisite printing of labels

there are many kinds of printing ink overload for shrink label printing. How to select the appropriate ink type? Ink suppliers should first understand the following information

● printing method: flexographic printing and gravure printing are mainly used for shrink label printing. Different printing methods have different ink printability

● different container shapes have different requirements on the shrinkage of materials

● different printing materials such as PVC, OPS, OPP and PETG have different requirements for ink

● product storage and transportation environment during the production, transportation and sales of products, what conditions will the container encounter, how much friction coefficient is required, what is the temperature and humidity environment, and whether there are special requirements (the shrinkage labels of beer and beverage products need good ice water resistance), etc

only after understanding the above factors can we choose the appropriate ink from the aspects of shrinkage, adhesion and the ability to release residual solvents (the ability to quickly dry at a lower temperature)

● shrinkage rate is the primary consideration when selecting heat shrinkable label printing ink. Because different products have different requirements for shrinkage. High shrinkage products are required to have a shrinkage of 60% ~ 70%, while low shrinkage products only require a shrinkage of 10% ~ 20%. See Table 1 for the shrinkage performance and application of different types of inks

● adhesion during printing and winding, the ink layers will often contact each other. If the ink with poor adhesion is used. Then the contact of the ink layer will cause problems when the product is stacked. The most common problem is adhesion. Generally, if the ink cannot be well attached, the method of raising the temperature of the drying oven can be adopted. However, the heat shrinkable material is sensitive to the judgment method of the temperature comparison tester, and it can not rely on increasing the temperature to improve the ink adhesion. At present, the best adhesion inks are solvent based inks and cationic UV inks. Water based ink and free radical UV ink have relatively poor adhesion due to the limitations of their raw materials

● there are quite strict standards for residual solvents in the current national standards. In order to make the solvent volatilize faster, some printing plants set the drying temperature higher during the ink drying process, but this will lead to material pre shrinkage. Therefore, excessive heat should not be applied to shrink labels in printing. This requires a balance between printing conditions and drying conditions

in addition, before selecting the appropriate ink for a specific heat shrinkable label, the printer must also strictly test the heat shrinkable film and its compatibility with the ink

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