China's paper product finishing technology has been making rapid progress in equipment and materials, and the equipment has been fully automated, on-line production lines, post-print coating, overburden, indentation, and slitting integration, greatly simplifying the packaging and printing. The production process and production costs are reduced, environmental pollution is overcome, and failures such as detachment and delamination are avoided. The production process of Paper Products for surface modification prolongs the service life of products, expands the consumption space, and makes paper product packaging comparable to plastics and metal packaging, especially in the process of circulation, in order to protect products, disseminate information, and facilitate storage and transportation. It has played an increasingly important role in consumer use and establishing national brands. At present, there are a wide variety of finishing technologies involving paper products, and there are no uniform formats, models, and standards. This article briefly talks about paper products and their finishing techniques.
First, what is the finishing technology
Paper finishing technology selects different finishing production processes based on different substrates (including no printed graphics and composite molding), and carries out post-press processing from the positioning requirements, forms, and material values of commodity brands. technological design. The general basis is: the use of different substrates (wrapping paper, kraft paper, composite paper, etc.) After prepress, printing and post-press processing for binding, molding, paper container processing, surface decoration and other technologies.
Throughout the paper finishing technology, it has always been inseparable from the printing, sorting, connecting, sewing (glue) box, mounting back, cover and other processing procedures. And almost all must use different finishing techniques to increase the high added value of paper product packaging and printing products.
Second, packaging and printing graphic design
As the outerwear of goods, packaging and printing has become an important factor that affects the competition of goods and the share of consumption. For this reason, people have increasingly higher demands on it. They must be low-cost, durable, and aesthetically pleasing; they must ensure that the goods are not damaged, but also stimulate the consumers to use more; they must have anti-counterfeiting capabilities. , but also easy to identify the logo must be both health and non-toxic, but also able to re-use?? Has now become a fashion, packaging and printing industry racked their brains to transform new styles.
The development of packaging substrates has enabled many new materials and technologies to be applied. The upgrading of products has also created new conditions for the development of commodity packaging. It can be simply summarized: Without ink materials, packaging printing (decoration, text) can not be called, and it is even less likely that there will be a civilization history and colorful packaging products; without adhesive material, there will be no different forms of packaging printing Modeling; no coating oil (paint) and film, there is no dazzling array of goods.
Third, the post-press processing content
Post-press processing technology, also known as post-printing technology. Strictly speaking: after the printing technology is not a technology, can only be called a method, but in the anti-counterfeiting packaging, due to the different printing locations, will directly affect the anti-counterfeiting effect. Therefore, the author believes that post-printing (anti-counterfeit) is a technology with special significance, because traditional printing will provide opportunities for counterfeiters due to poor management, and secondly, it cannot suppress the activities of criminals from the economic side, and the printing technology is just right. Solve the above two problems. After the printing carrier is completed, it is often necessary to carry out post-printing process design (ie, post-finishing engineering) based on its objects, such as paper container processing or book binding or surface processing. In the finishing technology of paper containers, usually The use of composite film-coated hot stamping varnishes and stamping. The following is a brief explanation of this common process.
1. Film. Before the film is coated, a strict inspection should be performed on the quality of the finished paper, because the surface of the film is flat, clean or not, the hardness, the smoothness of the edge, the speed of drying, the amount of residual solvent, dusting, The accuracy, strength, and laminating speed of the composite board will directly affect the film quality of the paper products (such as air bubbles and wrinkles).
2. Pad printing. Although it is second only to hot stamping, it is favored by the printing industry because of its low material cost and continuous batch production, as well as the ability to complete rotary transfer printing and slitting in one shot, with less waste. Taiwan's gravure pad printing equipment mostly uses acrylic resin as the link material, plus gold, silver powder, etc., and directly adopts rotogravure printing to print the ink on the PET mold first, and then randomly transfer to the printing material again. The emergence of the technology, first, is much lower than the cost of stamping, the second is the ability to mechanical rotation continuous operation, but better than the letterpress transfer printing effect, slightly more than the hot stamping effect.
3. Silk screen printing. The method is mainly to directly print UV ink or transparent ink on gold paper or silver paper (usually used in cigarettes and wine box packaging in recent years). As a part of the decoration, it is often screen-printed with a manual or rotary screen. As silk screen printing ink film is thicker than gravure printing 1 to 2 times, some units still use the copper and zinc printing plate to carry out the hot stamping technology on the aluminum. There are also varnish or ink transfer printing spring couplets, and then put the aluminum surface and flat surface paste, pressure on the flat, such as varnish or varnish oil completely dry and uncovered, it showed almost the same hot stamping with the quality of hot stamping.
4. Hot stamping. Nearly half a century of production has been used. Hot stamping temperature, pressure, hot stamping speed control determines the quality of hot stamping. After hot stamping usually requires: graphics and text does not change color, no white, no fade, and so on. Although hot stamping is lower in efficiency than wheel transfer printing, it has the advantage that printing and screen printing are not comparable to small pieces of printed materials, especially hot stamping on photographs cannot be replaced by other methods.
5. Polishing. Paper products should be selected according to the use of coating oil (paint slurry). In 2003, Wuhan Jinlong Cigarette Factory imported two high-speed labeling machines (two times the traditional, almost increasing the temperature by nearly 50 degrees). When traditional alcohol-soluble cigarettes and coating oils are used, the results are due to speed or The influence of temperature caused the migration of ink on the trademark and the sticking of the varnish to fail to be properly labeled, and the authenticity rate was less than 70%. After the improvement of ink and coating oil, it was transferred to normal production. At the same time, the UV coating of the cigarette box should be left at the joints on both sides to prevent the glue from sticking out.
6. Security. Laser holograms are printed directly on paper, so-called security paper. Now generally used in securities (such as covering the scratch scratch ink) mostly. There are also technologies such as printing anti-counterfeiting technology and security line anti-counterfeiting for watermark paper carriers that use coins as substrates. There are also miniature letter security thread, fluorescent security thread, business card paper, pearl paper, laser iris paper, aluminum foil and gold foil paper, silver foil paper and reprocessed embossed paper, refraction paper, punch paper, and matting paper. Even in the papermaking process, red, blue fibers or colored flakes (blocks, powders) are incorporated into the pulp, or are scattered on the surface before the paper is unmolded, fluorescent reflections occur under ultraviolet irradiation, and the like. Plano-convex printing and multi-process printing, special gloss printing, special matt printing, and laser holographic iris printing are collectively referred to as anti-counterfeit finishing technology for paper products.
7. Molding. Under proper pressure, the location of the indentation of the packaging paper product should be accurate, and the focus of its technology is the accuracy of the template. There are also paper-based prints made with air-press calendering, matte, and ice, which are highly favored by consumers.
Fourth, the binding process preparation
1. Stapling is part of the finishing technology for paper products. Staples must be matched to the printing process, taking into account the number of papers, the number of prints, and the user's quality requirements (such as the size of the open book, the size of the size, the folding style, the cover, the back cover, the layout and decor design of the spine, the simple and the hardcover, and the production Whether the cycle, schedule, Nissan capacity, capacity quota, material preparation, sample book determination, book block page number, graphic lining, appearance, and price meet the technical requirements of the bookbinding design. At the same time, the size and binding format, as well as the sample books printed in the printing shop after the book is printed, are checked and bound, and submitted to the quality inspection department for approval.
2. Book (including cartons) bookbinding process design whether the Founder at the time of cutting, no cutting and uncut, with or without hinges, broken, faded, inserts, ridges are centered, smooth, the cover is included and the page number Whether there are duplicates or missing pages and pagers, whether the pages are wrinkled or damaged, whether the pulp mouths, folding pages are the same, whether there are skipping pins, ordering lines, wireless binding, or whether they have been cemented firmly.
3. The choice of binding process and materials is our choice for materials such as covers, links, and linings. First, we need to pay attention to materials (such as offset paper, coated paper, glossy paper, and cardboard) needed for books and magazines (including Paper Boxes). Laminated paper, paperboard, PVA coated paper, lacquer paper, etc.) Request or propose a fee selection plan from the printing unit. The first requirement of the binding process is often economical, practical, and convenient.
4. The binding of the paper product binding process (including imposition design, layout planning) and imposition design (including the arrangement of the pages, the number of pages, the size of the pages, and the folding of the printed sheets should be taken into account when considering the use of each central page. , but also to take into account the relationship between pasting and pasting on both sides (such as cross-page, multicolored graphics), as far as possible in the center, the use of paper with the same PH value and color to ensure the consistency of the printing ink color and decorative text ink The integrity of the film will directly affect the level of finishing techniques such as paper products (including boxes and boxes) and other albums.
V. Conclusion
Paper finishing technology in the final analysis: You are looking at the other side and the financial class by-pass. Because with the development of the times and the passage of time, the situation will undergo new changes, especially the amount of solvent volatilization and total solvent residues in the ink, varnish and adhesive systems after film formation in the process of paper product finishing and The problem of environmental pollution caused by the amount of waste residue, etc., all we have to do is to solve the many problems that have been forced by the advancement of technology, and to improve our paper product finishing technology as soon as possible.
Reprinted from: Printing Information
