Explore the tips of label printing ink selection

Label printing materials are required, so label printing inks are required to have good printability on paper materials, plastic film materials, metal materials (such as electrochemical aluminum foil, metal foil). In the following, we take the gravure ink used in the gravure beer neck label and the gravure heat shrink sleeve label which are often used in daily life as an example, from the selection and matching of conventional solvents, the screening of additives, and the optimization combination of formulas. To explore the tips of label printing ink selection.

Mechanism of action of solvent

It is critical to master and apply the mechanism of action (50-80%) of the solvent that accounts for the largest proportion of ink composition. The role of the solvent is to dissolve the resin in the ink, but care should be taken to control the solvent's ability to dissolve (ie, solubility). It can neither dissolve nor dissolve well. Solubility is the primary condition for the choice of solvent. Second, use The solvent volatilization speed adjusts the drying speed of the ink, and selects a gradual process from fast to slow according to the volatilization speed. It is impossible to choose a solvent that is too fast and too slow to be transitioned. The third is to adjust the viscosity by using a solvent during the printing process. According to the depth of the gravure and the number of mesh lines, weather conditions, printing speed, etc., the viscosity of the ink can be adjusted to achieve the best printing effect. Generally, the solvent with better solubility is lower, and the dilution viscosity is lower; It is to improve the wetting property of the printing substrate. The organic solvent can improve the wetting substrate. The solvent has a certain ability to penetrate or dissolve on the surface of the substrate, which enhances the adhesion of the ink and thus improves the ink. The adhesion fastness.

Ink quality performance

Label printing requires good color rendering, hiding rate, image clarity, and is resistant to light (sun), water, acid and alkali. These properties are reflected in the viscosity (adhesion), adhesion fastness, and drying of the ink. Speed, color density, overprint ratio, chromaticity and color gamut, surface tension and other properties.

It is true that the gravure beer neck mark requires ink drying very quickly, the film is smooth, and the die-cutting performance is good (the cut is smooth and smooth, which is good for the winery about 40,000 bottles/hour high-speed labeling), and has excellent alkali water solubility (residue can not be Adhered to the inner wall of the recycled bottle).

The gravure heat shrink sleeve requires the ink to have excellent abrasion and scratch resistance, and the shrinkage ratio is matched with the printed substrate. At present, the heat shrinkable sleeve label is developed from the traditional affordable PVC film to the easily degradable PET and PETG film. In view of the large shrinkage rate of the latter, the shrinkage temperature is relatively high (typically 95 ° C, 10 ° C higher than PVC film). It is easy to deform, so pay special attention to the correct matching of resin and additive when designing ink formulation.

The quality performance of other label inks can also be analyzed by reference to beer neck label gravure ink and heat shrink sleeve label gravure ink.

Special requirements for label printing on inks

Nowadays, label printing has higher and higher requirements on the quality of ink. The main performances are as follows: First, the opacity requirement is high, especially the white ink. The opacity that can be achieved by printing twice before is now required to be printed once, such as Wahaha "etc. Second, the color consistency requirements are high. Color consistency is not only the requirement for the same batch of labels, but also the requirements for multi-batch printing labels. Since different batches of inks will inevitably have a certain color difference, they must be Strict control is in a small range. In particular, high-end product labels have the function of brand identity, and the requirements for color consistency are more stringent. In addition, even if different batches of printed matter are printed on the same printing machine, the printed matter may be different due to factors such as operation; in addition, the difference in printing materials also requires ink to adjust, therefore, the label ink manufacturer In addition to stricter quality requirements for inks, ink technicians also need technical service capabilities such as adjustment at any time.

Label printing companies need to have a good level of technical management, including the preservation of standard inks and printed samples. In addition, many of the label inks are spot color inks, and customers often require high-quality spot color inks in a short period of time, which is a specific requirement for label inks.

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