Many people are not familiar with the printing and processing characteristics of self-adhesive materials, which mainly focus on the following four aspects:
1. Consistency of surface gloss and color, and uniformity of density of the face stock
These properties determine the ink absorption uniformity of self-adhesive materials, as well as the color difference of label prints in the same batch. The coating strength of the face stock determines whether a large amount of paper dust will be generated during printing, and it is also an important indicator of printing quality.
2. Uniformity and strength indicators of liner and face stock thickness
These indicators are not only related to printing performance, but also crucial to die-cutting uniformity, as well as the speed and edge breakage during waste stripping. If these indicators are too low, label printing machines cannot achieve high-speed production.
3. Flatness of materials or uniformity of rewinding tension
Whether it is sheet-fed printing or roll-fed printing, the flatness of materials determines the accuracy of paper feeding, running, registration and delivery during the printing process. For roll materials, rewinding tension plays a key role in ensuring the flatness of the roll end face, preventing adhesive seepage, and achieving precise registration.
4. Uniformity and proper coating weight of adhesive and silicone oil
These factors affect the peel force (release force) between labels and liners. The peel force directly impacts die-cutting, waste stripping and machine speed, and also determines the label dispensing performance, i.e., the application effect of labels. In addition, the adhesive coating weight also affects the adhesive seepage at the material end face. Therefore, when purchasing self-adhesive materials, careful inspection is required to select products with appropriate adhesive and silicone coating weights.
