Heat shrinkable labels are very common in our lives. From the labels of mineral water bottles or clothes, we can see the heat shrinkable labels, and some heat shrink labels are very sensible, and businesses can also Make your own needs for your customers.
Since the heat shrinkable film is a thermoplastic film that is stretched and oriented during the production process and is heat-shrinked during use. Therefore, no matter which printing method is used for printing, the horizontal and vertical shrinkage of the material and the deformation error allowed in each direction of the decorative image after shrinking are considered before the design of the surface pattern, so as to ensure the pattern shrinking onto the container, Accurate restoration of text and barcodes.
Direction of the pattern
Regardless of whether the heat shrinkable film is gravure or flexographic, the printing is mainly in the printing mode, and should be positive with respect to the pattern direction on the printing plate. The shrink film is also printed today. If this is the case, the pattern on the plate should be reversed.
Due to the shortcomings of flexographic printing, if the shrink film is flexographic, the image layer should not be too fine, and gravure printing can require a richer image layer.
The shrinkage ratio of the heat shrinkable film material used for printing is 50% to 52% and 60% to 62%, 90% in special cases, and 6% to 8% in longitudinal shrinkage. However, when the film shrinks instantaneously, it is not restricted by the container, and the horizontal and vertical directions are not completely contracted. In order to ensure accurate restoration of the pattern, text and barcode after shrinking, the shape of the container must be taken into consideration, and the correct size and calculation according to the actual situation must be calculated. Deformation rate. For heat shrinkable labels that need to be formed into a cylindrical shape and sealed together by using an adhesive, it is necessary to pay attention to the fact that the image is not designed at the sealing portion, so as not to affect the bonding fastness.