Flexographic inks enter the three major "blockers" in the label field
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With the tightening of environmental protection policies, the collection of sewage charges by VOCs has become more and more strict, and the application of ink in various printing and packaging fields has also accelerated the speed of promotion. The application of ink in the label field has not been started in recent years, but it has not been widely applied. In addition to cost issues, the lack of binding of environmental protection policies, printing quality and process implementation issues are also the core issues that restrict the development of ink and wash in the label field.
01. ink color problem
The first requirement of more label printers for ink is that the color of the print is saturated, bright and bright, while the dryness and adhesion are ranked in the last two. In the ink, due to the presence of water, it is very easy to cause the gloss of the ink film after printing to be very low, especially in the printing of paper, the color of the printed product is not bright enough.
In response to this problem, in addition to the use of high-quality, bright colors of pigments, the choice of film-forming resin is a very important factor, in addition to the need for some additives.
02. ink drying problem
Whether using flexo or gravure, drying speed has always been an important factor influencing the feasibility of ink.
When printing with absorbent materials, the hot air passage is required to accelerate the drying of the ink, but at the same time there is the problem of ink penetration. If the two cannot be well balanced, it is easy to cause various deformations of the printing material and reduce production. Efficiency, causing losses.
The use of film-based non-absorbent materials, and the inability to penetrate dry, completely by heating and drying, usually causes the printing speed to decrease, affecting the production efficiency, and if the drying temperature is increased to accelerate the drying speed, it will cause non-absorption of the film. The elastic deformation of the material affects the quality of the printed matter.
In fact, the core factor affecting the drying of ink is its film-forming resin. From the early maleic anhydride resin system to the current polyurethane-acrylate composite emulsion system, the ink has experienced a relatively fast development process, and its performance has been improved in all aspects. Up to now, it has been basically able to achieve "pure water" ink. the concept of.
Control the initial drying and drying of ink to ensure its drying speed and good transferability
03. Water-resistant ink resistance problem
As a special product with labeling function, the label has certain requirements on its water resistance, abrasion resistance, scratch resistance and even high and low temperature resistance during the application process.
Many ink products have poor performance in water resistance and low temperature resistance, which is also an important reason for restricting their wide application in the label field.
In addition, in addition to print quality issues, cost is also an important factor limiting the development of ink in the label field. The low-end ink is not expensive, but the same quality can not meet the requirements; while the high-end ink quality is guaranteed, but the printing factory feels that the cost is too high.
With the successful development of new resin systems, pure water-based inks have achieved the goal of good quality and reduced cost. Under the increasing environmental pressure, most printing plants are compared to the VOCs sewage levy. Should still be acceptable
Under the stricter environmental protection policy, it is a pressing issue in the industry to speed up the introduction of environmentally friendly and cost-friendly new water-based inks.
It is not difficult to see that flexo ink has a lot of room for development in the field of labeling, and there are also many problems.