Color printing paper plastic film makes the surface of the printed product smooth and mirror-like, the color printing pattern is more colorful and dazzling, and it protects the ink, enhances the entire printing paper or packaging, and can also enhance the packaging and internal The packaging can play a role in waterproofing and dampproofing, especially covering the covers of books, journals, or transcripts, which can increase the number of times the cover is resistant to folding by thousands of times.
However, the paper-plastic film coating process also has shortcomings, that is, when the printed packaging products are recycled, the plastic film in them is not easy to remove and not easy to degrade, so more and more people in the industry believe that the surface should be coated with varnish Replace paper-plastic film. In fact, the use of surface varnishing technology is earlier than the use of paper-plastic coating, but the previous varnishing was mainly carried out in paper mills before printing. Now this kind of paper coating and varnishing before printing are widely used The amount of water-based polymer coating agent is increasing, the quality of the paper is getting better and better, the gloss of many high-grade coated paper is already very good, no longer glazing and coating after printing, and can meet the requirements of many products. .
But for the printing and glazing process, the application volume is still very small so far. Although it has the advantage of facilitating paper recycling, its shortcomings are also obvious. First of all, the enhancement effect and folding resistance times of glazing on products can not be compared with paper-plastic film products; secondly, the protection effect of glazing products on the color of printing inks, moisture and waterproofing are not as good as those of film products; again, the current glazing The quality and price ratio of oil products are still unsatisfactory. The gloss of water-based glazing oil is obviously insufficient. Organic solvent-based glazing oil pollutes the environment. UV glazing oil is not only surprisingly expensive, but also has environmental pollution problems of varying degrees.
But in general, the fundamental reason for the glazing oil's weakness in the color printing and packaging industry is caused by its insurmountable shortcomings compared with paper-plastic film products. In spite of this, many insiders still believe that varnish is a product with great vitality and great market potential. Its larger market is not in the field of book and notebook cover printing, but in the field of packaging and printing of other products. Because the outer packaging of many products is not like the covers of books and periodicals, it needs to be folded repeatedly, especially the low-end products of different grades. The market of water-based varnish is still relatively large. However, improving product quality, reducing product prices, and making varnish free of volatile organic poisons are the three major problems that varnish products must overcome first.
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