Shrink film label of pre-press and printing process - shrink film labels, label - Printing Industry
Pre-Press As shrink film Label , In printing process, the shrinkage deformation is inevitable, and sometimes even more serious, and in different directions and locations of shrinkage strain are likely to be different. So, how do pre-printed graphics and bar code of the shrinkage deformation errors are designed to produce shrink labels different from other printed materials is different. The following brief analysis on how to deal with.
1, Shrink Film Making Equipment In theory that should Plastic Film for good printability, the surface tension should be higher than the ink surface tension at the same time to have a certain roughness of the surface to form the adhesive force.
And polyolefin plastic films such as PP, PE film is a non-polar polymer materials, chemical stability, surface tension, the tension below the ink. Poor adhesion of the ink. However, some surface tension and ink film although very even higher tension, but its surface is smooth, nonporous surface adsorption force is small, while the various synthetic resin film of antistatic agent added to the opening will also affect the anti-aging agent film surface properties, printability it worse. Therefore, most shrink films are some printability problems. Therefore, to improve the printability of the film surface to be poor performance on the printed film surface pretreatment, the surface tension and surface adsorption capacity. Methods commonly used corona treatment, plasma treatment, chemical treatment, coating method and so on.
2, label graphic on size First, we must shrink the thickness of the horizontal and vertical film shrinkage and Package Permitted in each direction after shrinkage, shrinkage deformation graphics allow the deformation error, etc., to determine the size of shrink label graphics to ensure that shrinkage deformation of the graphic can be accurately restored.
3, heat shrink labels Graphic Design Shrink label's graphic design shape of the container to be considered, pre-press department of the designer on the label of some of the parts needed for proper deformation processing, the key image as much as possible not to place high on the contract. In addition, with the container manufacturer Cooperation So that the density of suitable container. Both in size small parts, or parts of a larger size, are able to provide the correct shrinkage.
Printing process Present, shrink film labels mainly uses gravure printing, solvent inks, gravure printing plate for high precision, gravure printing in the film quality is the best of all print, ink thickness of stereoscopic , graphic rich layers. And the rate of large plate-resistant printing for longer version of live, and often higher than the amount printed on the label, so the gravure printing is more suitable. But the gravure plate-making complexity, long period, high cost, easily contaminated. Second, flexible format printing, with the flexo plate making and printing technology, printing, bright clarity, with the intaglio of thick and high gloss, and use more water-based flexo ink, is conducive to Environmental protection Therefore, the improvement of environmental protection requirements, will be more flexible printing applications. In addition, the offset and Digital Printing There is a certain range of applications to meet customer's specific needs.
Shrink labels in China developed very quickly though, as other labels have not been sought after, heat shrink labels in possession of the advantage of large but not as good as the next Adhesive Tags favored, because it is difficult to overcome without too many obstacles, not enough to attract the curiosity of the printing industry; In addition, the lower the overall level of shrink labels, in marketing and technology development and the limitation is its poor box office reasons. But on the application of heat shrinkable label the current situation, the use of such labels will be more and more, but the form will not change, only there will be improvements in materials, more in line with environmental requirements, the future trend is bound to the environmental protection direction.
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