Shrink labeling is becoming more and more popular, and it is growing rapidly at a double-digit percentage every year. The reason for this result comes from at least two reasons. First, the shrink label can make full use of the entire container surface, and it plays a very good role in the reproduction and transmission of images and information. On the other hand, the container itself can also be made into a variety of unique shapes, not limited by how to label it later, which can greatly enhance the shelf appeal of packaged products.
However, it is precisely because of these special shapes that higher requirements and challenges are placed on label materials and their printing inks. In addition to dealing with the problem of adhesion of non-porous film materials, shrink label printing inks also have to deal with several other factors in order to get better development, including deformation (scratch, delamination, etc.), paste, low COF (coefficient of friction) and low odor for food and beverage packaging. And these requirements also promote the further development of printing materials and inks.
Suitable for specific materials
In terms of materials, PVC, PETG and OPS occupy most of the market for shrink labels. According to Manuet Rivas, the technical director of the PPL division of Siegwerk, the first two account for 90% to 95% of the market. Since each film has its own surface characteristics, Rivas emphasizes that each film needs to use a specific ink composition to obtain proper performance.
To meet changing needs, Siegwerk provides solvent-based inks specifically designed for each shrinkable thin material and printing process. In addition, flexographic printers using water-based inks can use corona-treated PVC and PETG films to print with their CWS-2100 series inks, while SICURA series inks can meet the needs of UV printing. In order to facilitate people to choose inks, the company also introduced the solvent-based ink AccessSleeve, which is suitable for all film materials.
INX International Ink Company has developed Shrink Pac series of inks, which can be used in a variety of materials, suitable for a variety of printing processes, such as Shrink Pac for gravure printing, FlexoShrinkPac for flexographic printing. "While simplifying and accelerating job turnover, our inks also solve some of the other daily problems encountered by many shrink label printers," said LuigiDe FlaviisJr., Head of the INX liquid ink division.
Development towards multi-function
While ink suppliers provide a series of ink products to meet a specific shrink label printing, inks suitable for a variety of shrink label materials are making rapid development. "Before, many inks were suitable for a specific material, but now, the updated series of inks show multi-functional characteristics on a variety of materials," said John Kalkowski, North American marketing manager of Sun Chemical, It helps to reduce the number of printing machine cleanings, reduce cross-contamination, and helps control the amount of ink used. "
A latest development from XSYS is Flexocure XSUV free radical curing ink, which can provide 70% shrinkage, suitable for a variety of film materials, including PVC, OPS, OPP, PET and PETG, and can also be used for surface printing and Inside.
Fuji Xerox's Uvisleeve is another UV flexographic printing ink, which is designed according to various characteristics of the shrinking process.
The company's marketing manager Fultz emphasized several key qualities of Uvisleeve, such as low COF, low chemical odor, and maximum shrinkage, to facilitate the shrinkage of label materials. In addition, they also provide white ink with high opacity. The role of low COF is mainly reflected in the sealing process, which allows the sleeve label to pass through the labeling device quickly after sealing.
When designing UV inks for shrink label printing, Bob Vidington, general manager of U Vitec, pointed out that the resin and photoinitiator selected must take into account the shrinkage of the film, will not scratch the material, and has a better performance in a relatively cold environment If the performance is not distorted. UVitec recently launched a new series of UV shrink label printing inks that improve scratch resistance and delamination resistance.
Water Ink Technology provides both water-based inks and UV inks, which can be applied to the usual shrink label printing. Processors can use the best characteristics of each ink to meet their respective needs, such as the economics of water-based inks, UV ink opacity or sleeve efficiency.
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