Performance indicators and selection factors of label printing inks
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The performance indicators of label printing inks mainly include hue, fineness, saturation, gloss, adhesion, viscosity, and dryness. These properties have a significant impact on the printing process and print quality. Here are a few of the performance indicators highlighted.
1. Ink viscosity stability is one of the prerequisites for ensuring the consistency of print quality. Too high or too low ink viscosity is not conducive to printing. Therefore, the control of ink viscosity is very important. Generally speaking, in the printing process, as the moisture and solvent in the ink are continuously volatilized, the viscosity of the ink will gradually increase. Therefore, the viscosity of the ink should be measured frequently, and the viscosity change record should be made and adjusted in time.
2. The drying property of the ink also has a great influence on the label printing. If the drying is too fast, the pattern may become lighter or even dry. If the drying is too slow, the ink may stick or the printed matter may be dirty. In general, the drying speed of the ink should be compatible with the printing speed, the drying ability of the printing apparatus, and the area of the printed pattern.
3. For water-based label printing inks, pH control is very important, generally between 8 and 9. The change in pH of the aqueous ink also causes a change in viscosity. Therefore, an appropriate amount of pH stabilizer is added to the ink at regular intervals during the printing process.
In general, when selecting the label printing ink, it is necessary to consider the type of printing material, the printing method and printing conditions, and the special requirements of the customer. Post-press processing, the use of the label and the conditions of use, cost and other factors.
1. The type and performance of the printing material is one of the most important factors determining the printing ink of the label. Different substrates require different inks. For example, paper labels can be printed with aqueous inks, while film labels are typically printed with solvent based inks. In addition, it is worth noting that even the same type of substrate, if the variety, grade or surface properties are different, different inks may be used.
2. Printing methods and printing conditions are also one of the important factors affecting the selection of label printing inks. Ink of different printing methods can not be used instead of or in combination, and the printing speed, type and performance of printing equipment have certain influence on the selection of label printing ink.
3. Also consider the customer's requirements when selecting the label printing ink. Sometimes customers may require labels to have a special effect, such as ice effect, matte effect, anti-counterfeiting effect, etc. At this time, it may be necessary to consider how to meet the special requirements of customers and products from the perspective of label printing ink.
4. Does the label go through some special processing processes along with the products it is pasting? There are special requirements that have a certain impact on the choice of labels. For example, in some product processing processes, the labels attached to them may be subjected to high temperature tests or to some chemical reagents, which requires label printing. The ink must have excellent high temperature resistance, chemical resistance, etc., otherwise the label may be deformed or damaged.
5. The use and environment of the label is also a factor that can not be ignored when selecting label printing ink. For example, the label used on the daily cleaning product usually requires the ink to be printed to have good acid and alkali resistance and grease resistance. For example, in the outdoor use of the label, due to the test of wind, sun and rain, the choice of label printing ink must pay attention to the performance of the ink in light, water, high temperature, acid and alkali resistance.
6. Cost factors. The goal of the company is to pursue the maximization of profits, which inevitably involves cost issues. In general, UV label printing inks are the most expensive, followed by water-based label printing inks, while solvent-based label printing inks are the lowest price. Of course, we must also consider the costs and costs of transportation, storage and so on.