HYF

The essentials of making heat shrinkable film labels are worth seeing!

by:HYF     2021-03-06
The essentials of making heat shrinkable film labels are worth seeing! Release time: 2018-03-09    [Abstract] Because the heat shrinkable film is a kind of thermoplastic film that is stretched and oriented during the production process, but is heat-shrinked during the use process. Therefore, no matter which printing method is used for printing, before the design of the surface pattern, the horizontal and vertical shrinkage of the material, as well as the allowable deformation error in each direction of the decorative graphic after shrinking, can be taken into account to ensure that the pattern, Accurate restoration of text and barcode.  【Text】  1, the direction of the pattern    Whether the heat shrinkable film adopts gravure printing or flexographic printing, its printing is mainly in the printing method, and the direction of the pattern on the printing plate should be positive. Nowadays, there are also surface-printed shrink films. In this case, the direction of the pattern on the printing plate should be reversed.  2, the level of the pattern   is limited by the shortcomings of flexographic printing. If the shrink film adopts flexo printing, the level of the image should not be too delicate, while the use of gravure printing can require richer levels of the image.  3, size design  The transverse shrinkage rate of the heat shrinkable film material used for printing is 50%~52% and 60%~62%, and it can reach 90% under special circumstances, and the longitudinal shrinkage rate is required to be 6%~8%. However, when the film shrinks instantaneously, due to the limitation of the container, the horizontal and vertical directions cannot be completely contracted. In order to ensure the accurate restoration of the pattern, text and bar code after shrinking, the shape of the container must be considered, and the correct size and size must be calculated according to the actual situation. Deformation rate. For heat-shrinkable film labels that need to turn the sheet-like film into a cylindrical shape and use an adhesive to seal the overlapping parts together, it is necessary to pay attention to generally not design graphics and text on the sealing part, so as not to affect the bonding fastness.  4. Barcode placement   Generally, the placement direction of the bar code should be consistent with the direction during printing, otherwise the lines of the bar code will be distorted, which will affect the scanning result and cause misreading. In addition, the color selection of label products should be based on spot colors as much as possible, and the production of white version is necessary, and it can be made into full or hollow according to the actual situation. The color of the barcode should follow the general requirements, that is, the color matching of the bar and the space should comply with the principle of barcode color matching. Printing material selection. The printing of heat shrinkable film labels has been briefly analyzed above. In addition to controlling the quality of the printing process, the material plays a decisive role. Therefore, choosing the right material is the key. Determine the thickness of the film material according to the application field and cost of the heat shrinkable film label, the characteristics of the film, the shrinkage performance, the printing process and the labeling process requirements. It is generally required that the film thickness of the shrink film label should be 30 microns-70 microns, with 50 microns, 45 microns, and 40 microns more commonly used, depending on the labeling performance of the labeling equipment. For selected label materials, it is generally required that the shrinkage rate of the film material is within the application range, and the transverse (TD) shrinkage rate is higher than the longitudinal (MD) shrinkage rate. The transverse shrinkage rate of common materials is 50%~52% and 60%~62%, and can reach 90% under special circumstances. The longitudinal shrinkage rate is required to be 6% to 8%. In addition, since shrink films are very sensitive to heat, high temperatures must be avoided during storage, printing, and transportation. Previous: Plastic bottle caps and plastic bottle labels need to strengthen management
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