Self-adhesive label printing is a special printing. Generally, its printing and post-press processing are completed on the label machine at one time, that is, multiple processing operations are completed on several stations of one machine. Because of the online processing, the control of the printing quality of the sticker is a comprehensive printing and processing problem. It should be comprehensively considered and implemented from the aspects of material selection, equipment configuration and control to the formulation of the process route, and tracking The application of label products at customers to further improve the quality of label products. 1. Selection of raw materials When selecting raw materials, be sure to use high-quality self-adhesive materials that meet all physical and chemical indicators, instead of using expired or unstable physical and chemical indicators. Although the price of the latter is low, due to the unstable quality of such materials, the consumption of each process is large, and even the equipment cannot be processed normally. While wasting raw materials, a lot of manpower and material resources are also wasted. As a result, the processing cost of the finished label It is not necessarily low, and more seriously, it may be returned by customers, or even lose customers. The choice of raw materials should be considered from the following two aspects. 1. Printing and processing characteristics of stickers â‘ Consistency of surface gloss and color of surface material, uniformity of density Achieving some indicators determines the uniformity of ink absorption of the self-adhesive materials, and also determines the color difference of the same batch of label prints. The coating strength of the face material determines whether a large amount of paper dust will be generated during printing, and it is also an important indicator to determine the printing quality. â‘¡The uniformity and strength indication of the thickness of the backing paper and face material These indexes are not only related to printing performance, but also important indexes that determine the uniformity of die cutting and the speed and edge breakage when discharging. If these indicators are too low, the label machine will not be produced at a speed. â‘¢The flatness of the material or the uniformity of the rewinding tension Whether it is single-sheet printing or web printing, the flatness of the material determines whether the paper can be correctly fed, run, registered, and received during printing. For the roll material, the rewinding tension will play an important role in the flatness of the end surface of the roll material, whether there is glue leakage, and whether it can be correctly registered. â‘£ Uniformity and correct coating amount of adhesive and silicone oil coating These indicators directly affect the peeling force (release force) between the label and the backing paper, and the size of the peeling force directly affects the die-cutting waste discharge and the speed of the machine. The peeling force also determines the label's output status, that is, the application status . In addition, the amount of glue applied will also affect the material's end-face penetration. Therefore, when purchasing adhesive materials, we must carefully check and choose the materials with the appropriate amount of glue and silicon.
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