Before drupa 2004, PUR adhesive technology (Polyurethane Reactive) was introduced in the post-press market; Drupa 2008 has achieved a breakthrough in this technology, and this year, it also gave many people in the industry. Branded the impression of "PUR plastic packaging technology key year"; in 2009, PUR plastic packaging technology gradually entered the domestic Printed after the market.
PUR itself is a kind of hot melt adhesive. Its biggest advantage is that it has a high bond strength. Compared with the traditional EVA hot melt adhesive, the adhesion is 4 to 5 times higher, so that the single book is glued. There will be a significant reduction in volume. According to past experience, if a book is glued and the thickness of the traditional EVA hot melt adhesive is 1 mm, then only 0.3 mm thick glue is required for PUR, which can save about three points per book. Second, the reduction in the amount of glue is directly reflected in the production speed of the equipment, which makes the post-printing process of the entire book simpler and more efficient.
In addition, another great advantage of PUR is that it has an extremely rich material adaptability. The change of the weight of the paper and the printed products of the ink and the paint will not affect the effect of the PUR adhesive. Even if the printing operation is just completed, there is still a small amount of moisture in the single page, and the glue of the PUR will not be lowered. Viscosity. In the type of substrate, whether it is commonly used double-adhesive paper, light-coated paper, or traditional EVA difficult to cope with coated paper, coated paper, plastic paper, PUR can easily deal with, but also save the traditional EVA because of the plastic Unsatisfactory and more nailing.
Based on this, the reduction in the amount of sizing and the higher processing capacity of the printing material allow the finished books of PUR to be evenly spread, which reduces the process gap between the PUR binding technology and the traditional locking line. Zhejiang Yingtian Printing Co., Ltd., which focuses on image production, is an early batch of digital applications in China. The domestic printing enterprise of printing technology also purchased Pinghu Niubang to explore 500PUR plastic equipment. Li An, director of Pinghu Niubang Machinery Co., Ltd., said, “At present, many domestic image producers who focus on wedding dresses and albums have begun to choose PUR plastic equipment. Used to complete the binding task of butterfly packaging, many customers have feedback that the finished product made with PUR glue technology is similar to a fake hardcover, the whole thickness is thinner, and it is more refined from the perspective of viewing."
The above content is excerpted from the 4th issue of Digital Printing in 2015. More journal content please pay attention to the journal channel.
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