The shrink label is a film label printed on a plastic film or plastic tube with special ink. During the labeling process, when heated (about 70 ° C), the shrink label will quickly shrink along the outer contour of the container. Close to the surface of the container. Shrink labels mainly include shrink sleeve labels and shrink wrap labels.
Shrink sleeve labels are made of heat-shrinkable film as the base material, and are made into cylindrical labels after printing. It has the characteristics of convenient use and is very suitable for special-shaped containers. Shrink sleeve type labels need special labeling equipment to cover the printed sleeve label on the container. The shrink film labeling machine opens the cylindrical sleeve label, then cuts the shaped sleeve onto the container, and uses the steam, infrared or hot air channels to adsorb the sleeve label on the surface of the container. Due to the high transparency of the film itself, the label has a bright color and good gloss. However, because it must be shrunk during use, there is a disadvantage of pattern distortion, especially for products printed with barcode labels. Must pass strict design and printing quality control, otherwise the deformed pattern will cause the barcode quality to be unqualified.
Shrink wrap labels can be labeled using traditional labeling equipment. Adhesives and higher temperatures are required during the labeling process. Because OPP surround labels have low shrinkage, hot-melt adhesives are more suitable for labeling. Solvent-based adhesives will cause film folds. Hot air is better than steam for shrinkage.
At present, shrink sleeve labels account for 70% of the entire US shrink label market, but industry insiders believe that due to the advantages of shrinking surrounding labels, such as high brightness, higher shrinkage, and increasing application products, their market share is also continuing. The increase will develop in parallel with shrink sleeve labels in the near future.
Market is bullish
Shrink label is not a new product in the field of label. It has been widely used since the early 1990s. However, it has the unique advantage of being able to cooperate with product packaging, in particular, it can make full use of the space of the container and express the product information in all directions, so it is very popular in the packaging market. Worldwide, the market for shrink labels is estimated to be about $ 3 billion. Although the growth of this market has not been stable in the past few years, industry insiders are still optimistic about the future development potential of the shrinking label market. "A few years ago, the shrink label market grew by nearly 8%, because the impact of the financial crisis has now dropped to 4%." Gary Gates, chairman of Gates Packaging in Texas, USA, said, "The shrink label Innovative technologies and ideas are constantly emerging on the market, so I firmly believe that in the near future, the growth rate of the market will return to 6%. "
Mr. Gates is an authoritative expert in the field of shrink labeling. He has been a consultant in this field for many years.
Recently, Mr. Gates found that shrink labels have been widely used in the field of household washing products, such as detergents, dishwashing detergents and softeners, etc., and many product packaging have changed from in-mold labels to shrink labels. He said: "In the field of washing products, shrink labels have seized part of the market for in-mold labels. If the in-mold labels are not well controlled during the labeling process, the labels and containers will be scrapped together, which is very wasteful. There is no such problem. "
Printing and ink
Gravure printing is still widely used in shrink label printing, while flexo printing has been popularized, especially in the field of narrow label. Offset printing is also favored by some other people, including Mr. Gates.
Different printing methods have different printability. Gravure printing generally uses solvent-based inks. The shrinkage of solvent ink exceeds 40%, and the maximum shrinkage can reach 70% to 75%. The required drying time is less and is affected by moisture, but it is slightly affected by the movement of atoms in chemical molecules. For most films, the adhesion of solvent-based ink is the largest.
When printing on a flexographic printing press, environmentally friendly water-based inks are mainly used. Environmentally friendly water-based inks can shrink by more than 40%, are very flexible, and have lower costs than UV inks. Moreover, the ink surface is less affected by the movement of atoms in chemical molecules.
For offset printing, the flexibility of the ink is very important. To produce high-quality shrink labels, the flexibility of the ink is necessary. Because the ink must not only withstand the test of high temperature, but also must ensure that it is not affected during the physical shrinkage process. Mr. Gates introduced: "As long as the ink is flexible and flexible enough to allow you to obtain high-quality adhesion, and equipped with an excellent offset press captain, you can definitely produce perfect offset shrink labels." Gates said that various printing methods It can print shrink labels. Gravure printing is favored in the early application of shrink labels. The application of flexo printing has limitations. It can be said that the future prospects of offset printing are more promising.
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