In order to meet the requirements of environmentally friendly production, there are several types of solutions for replacing the conventional gravure inks in the flexible packaging gravure industry, namely single solvent or single solvent ink, ink, solvent-free energy curing ink. So, what are the things that these inks need to pay attention to during the use process, let us take a closer look.
Single solvent or single solvent ink
These inks use a single acceptable solvent or a certain type of solvent, which can solve the problem of difficult solvent recovery of various components in VOCs recycling, and help flexible packaging gravure companies achieve circular economy. At present, there are many applications of such inks, but many flexible packaging companies only use them in a certain color printing , and have not been fully promoted, because there are still some problems in the use of traditional solvent inks, mainly in the following Several aspects.
(1) The vividness of the ink deteriorates. Since there is only one or a type of solvent in the formulation, the solvency is relatively weak, which means that the color development of the ink is deteriorated and the vividness is lowered.
(2) The transferability of the ink is deteriorated. Especially in the shallow web portion, the short plate of a single type of solvent or a single solvent ink lacks a slow drying solvent, and the integrity of the print is not well exhibited for the transition mesh and the shallow mesh portion.
(3) The fluidity of the ink is deteriorated, resulting in an overall improvement in the viscosity of the ink, a deterioration in storage stability, and a large thixotropy.
In order to completely solve the above problems, there is still a long way to go, because this is not only the choice and manufacturing of ink, but a series of problems that require the entire flexible packaging processing industry chain to solve together.
(1) Solving from the viewpoint of ink manufacturing, such as selecting suitable pigments, dispersants, resin additives, etc., so that the ink color, solubility and the like of the ink can be improved.
(2) From the point of view of the production of flexible packaging gravure companies, the changes in the production environment should be controlled during the production process to create conditions suitable for a single type of solvent or a single solvent ink.
(3) From the point of view of the printing equipment manufacturer, the printing speed of the gravure printing machine is increased to adapt to the drying speed of a single type of solvent or a single solvent ink, so as to avoid the problem of ink transfer such as white spots in the blocking plate and the shallow mesh portion. In addition, it is necessary to improve the accuracy of overprinting and to assist in the winding up and down.
(4) From the perspective of the terminal brand, design the simplified pattern as much as possible to avoid complicated and heavy-colored printed patterns.
(5) From the perspective of the supplier of the plate material, it is necessary to cooperate with the plate making.
Ink
At present, many flexible packaging companies in China are conducting testing applications for gravure ink, and industry people have different effects on their use. The author believes that in the process of using ink and wash in flexible packaging gravure companies, it is necessary to pay attention to and solve the following problems.
(1) Is it a pure water-based ink? When the ink contains other alcohol solvents, it also brings exhaust gas treatment problems, and the low concentration of exhaust gas brings a series of problems such as increased processing energy consumption and affecting production efficiency.
(2) Ink and ink imposes higher requirements on the drying ability and rust prevention of gravure printing equipment.
(3) The drying of moisture in the ink requires the use of a higher drying temperature and a larger dry air volume, which inevitably leads to more energy consumption, which ultimately leads to an increase in the total cost.
(4) The higher drying temperature makes the plastic film easier to be stretched. In order to prevent the film from being deformed and to ensure good overprinting, higher requirements are required for the conventional electronic shaft gravure printing equipment.
(5) The use of ink should also consider regional issues, such as the high humidity climate in southern China, which is not conducive to the use of ink.
(6) One of the key problems in the use of ink is to change the gravure plate making process. The shape of the ink roller roll mesh is large and shallow. The shape of the common ink plate roll is small and deep, and the ink roll is more than the ordinary ink plate. The width of the groove of the roller is 10% to 15%, and the depth is 40% to 50%.
(7) How to better match the subsequent compound process? After the printing is completed, the film product will have some moisture residue, and the presence of -OH will lead to incomplete curing reaction of the adhesive (here, solvent-free composite process), which affects the perfect performance of the composite performance of flexible packaging, while the composite performance is related to Flexible packaging plays a role in barrier function from production and transportation to consumer use.
(8) For some materials that are sensitive to water (such as BOPA), how to control the printing quality during the printing process?
(9) How to solve the problem of timely blocking of the blocking plate and the ink roller in the printing process?
The above problems are all things that soft packaging companies need to consider when applying ink, but the development of everything is gradual. In order to promote the use of ink, from the point of view of equipment, it is necessary to solve the problem of drying. Many of the common practices of flexible packaging companies that attempt to apply ink are to change the length of the tunnel and increase the amount of dry air. Recently, many printing equipment suppliers (such as Shaanxi Northwest Printing Machinery Co., Ltd.) have developed a gravure printing machine for film gravure ink. The energy consumption of such gravure printing equipment is about 50% of that of conventional gravure printing equipment, and the air of 80% humidity can be dehumidified to less than 20%; the drying speed can be greatly increased, and the drying temperature of ink can be reduced to 50-70 ° C; The printing speed of ink (only 5% ethanol added to the original ink) can reach 250-300 m/min.
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