Heat shrinkable film labels: the choice of ink

Shrink labels are suitable for a wide range of layoffs. Packaging containers such as plastic, glass, ceramics can be decorated, and they are widely used in beverages, food and daily chemical products. Shrinking labels are undergoing rapid growth, and their market share continues to expand. The annual growth rate far exceeds that of ordinary labels, with huge development potential.　　 At present, failure analysis and elimination, gravure printing shrink labels are mostly used in China. This article briefly introduces how to choose gravure inks for heat shrinkable film labels and the precautions in use. 'China Printing Industry Annual Report' 　　Ink Selection　　When choosing heat shrinkable label gravure ink, the following factors are mainly considered. 1. Printing substrate 　　 At present, there are not many general-purpose inks such as DIC MSR in China. Therefore, when choosing inks, pay special attention to the substrate used, otherwise it will cause problems such as low adhesion of the ink due to improper selection. What's more, if the benzene and ketone-containing ink suitable for printing on PVC film is mistakenly used for water supply/dampening on OPS film, the OPS film will dissolve, the ink transfer will be poor, and sometimes the film will be caused by the printing tension. fracture. 2. The conventional indicators of ink '' mainly include the ink's printability, adhesion, abrasion resistance, scratch resistance and rubbing resistance. The shrinkable ink is no longer compounded after printing, so the requirements for these indicators are higher than the general composite lining ink, especially the slippery metal packaging of the ink, which determines the sliding efficiency of the printed label on the surface of the container. Improper design will cause Failure of sleeve labeling efficiency and uneven shrinkage. 3. The drying performance of the ink When printing shrink film, the printing speed is slow, the drying temperature is lower, and the substrate is susceptible to solvent erosion. The paperback binding line is surveyed, so special attention should be paid to the solvent release and anti-adhesion properties. Better ink.　　4. The shrinkage performance of the ink 　　 The shrinkage performance of the ink must match the shrinkage characteristics of the shrink film. If a low shrinkage ink is used on a high shrinkage film, it will cause the ink layer to burst. 5. Content resistance performance Although the ink will do the corresponding acid resistance, alkali resistance and alcohol resistance during the formulation design and production process, the corresponding acid resistance, alkali resistance and alcohol resistance will be considered and tested. However, due to the wide range of inks used in shrink labels, the content varies widely. Previously, especially when printing labels for daily chemical products and medicine bottles, it is necessary to do tests to confirm the resistance of the ink. What kinds of materials are available for environmentally friendly heat shrinkable film? , POF heat shrinkable film is different from other packaging films