As for Polyolefin Shrink Film tags, during the printing process, shrinkage deformation is inevitable, sometimes even serious, and the shrinkage deformation may be different in different directions and locations. Therefore, how to design the shrinkage deformation error of graphics and barcodes before printing is the difference between making heat shrinkable film labels and other printed materials.
Polyolefin Shrink Film
1.Prepress processing of POF Shrink Film
Theoretically, to obtain good printability on plastic films, the surface tension of the film should be higher than the surface tension of the ink, and at the same time the surface must have a certain roughness to form an adsorption force.
Polyolefin Shrink Films, such as PP and PE films, are non-polar polymer materials, with stable chemical properties, low surface tension, and lower than the ink tension. Poor adhesion to ink. Although some films have a surface tension comparable to or higher than the ink tension, their surfaces are smooth, and their capillary pore-free surface has a small adsorption force. At the same time, the opening agent, antistatic agent, and anti-aging agent added to various films in synthetic resins will also affect The surface properties of the film make its printability worse. Therefore, there are currently some printability problems in most shrink films. Therefore, in order to improve the printability of the film surface, the surface of the film with poor printing performance must be pretreated to improve the surface tension and surface adsorption force. Common methods include corona treatment, plasma treatment, chemical treatment, coating treatment and so on.
2.Determining the size of label graphics
First, determine the size of the text on the heat-shrinkable film label according to the thickness of the shrinkable film, the horizontal and vertical shrinkage of the film, the allowable shrinkage in various directions after packaging, and the deformation error allowed after shrinking and deforming the graphics. The pictures after shrinkage and deformation can be accurately restored.
3. Graphic design of heat shrinkable film label
The graphic design of heat shrinkable film labels needs to consider the shape of the container. Designers in the prepress department need to correctly deform some parts of the label and try not to place key images in places with high shrinkage. In addition, you can work with container manufacturers to make container density suitable. It can provide correct shrinkage in both small and large sizes.
4. Printing art:
At present, the printing of heat shrinkable film labels mainly uses gravure printing, using solvent-based inks, because gravure printing plates have high precision, and the printing quality of gravure printing on films is the best of all printings. Rich levels. In addition, the printing plate has a high resistance to printing, which is suitable for long-run printing, and the printing volume of labels is often large, so gravure is more suitable. However, the gravure printing process is complicated, the cycle is long, the cost is high, and it is easy to pollute. The second is flexographic printing. With the development of flexographic platemaking and printing technology, the printing color is clear and clear, with the thickness and high gloss of the gravure, and the use of water-based inks for flexo printing is conducive to environmental protection. Plate printing will have greater applications. In addition, offset printing and digital printing also have a certain range of applications to meet the specific needs of customers. We are POF Manufacturer, welcome to consult.