Self-adhesive label printing is a special type of printing. In general, its printing and post-press processing are done once on the labeling machine, that is, several manual positions of three machines in multiple adding operations. From the in-line processing, the control of the quality of the self-adhesive label printing is a comprehensive printing and processing problem. It should be comprehensively considered and implemented from the selection of materials, the regulation of equipment configuration, and the formulation of process routes, and tracking the label products. The application situation of the customer to further improve the quality of the label product.
一、Selection of raw materials
When selecting raw materials, it is necessary to use high-quality, self-adhesive materials with qualified physical and chemical indicators, rather than products with unstable or physicochemical indicators. Because the latter is low in price, due to the unstable quality of such materials, the consumption in each process is large, and even the equipment cannot be processed normally. When the raw materials are wasted, a lot of manpower and material resources are wasted, and the finished label processing cost is Not necessarily low, but even more serious is the possibility of returning customers or even losing customers.
The choice of raw materials should be considered from one or two aspects：
1、Printing and processing characteristics of self-adhesive materials
?、?、Surface gloss and color consistency of the face material, uniformity of density
These indicators determine the uniformity of ink absorption of the self-adhesive material and also determine the color difference of the same batch of printed products. The coating strength of the face material determines whether a large amount of paper powder is produced during printing, and is also an important indicator for determining the quality of the printing.
?、?span style="font-family: 微軟雅黑; font-size: 14px;">、Base paper, face material thickness uniformity and strength indication
This bluffing target is not only related to printing performance, but also an important indicator for determining die-cut uniformity and speed and paper edge breakage during discharge. If these indicators are too low, the label machine will not be able to produce.
?、?span style="font-family: 微軟雅黑; font-size: 14px;">、Flatness of material or uniformity of rewinding tension
Whether it is single-sheet printing or reel printing, the flatness of the village material determines whether the paper can be correctly fed, run, registered and delivered. For the reel material, the rewinding tension plays an important role in the flatness of the end face of the reel material, whether there is gluing, and whether it can be properly registered.
?、?span style="font-family: 微軟雅黑; font-size: 14px;">、Adhesive, silicone oil coating uniformity and correct coating amount
These indicators directly affect the peeling force (release force) between the label and the bottom paper, and the peeling force directly affects the die cutting waste and the speed of the machine. The peeling force determines the labeling condition of the label, that is, the application. In addition, the amount of glue applied will also affect the bleeding of the end faces of the material. Therefore, when purchasing self-adhesive materials, Westerners really check the materials that are suitable for the amount of glue applied and the amount of silicon applied.