According to the different raw materials and equipment, the coating process can be divided into two kinds of coating process and pre-coating process. That is to say, the film used in the coating process is now coated, and the adhesive used is generally solvent-based and emulsion type, prepared according to need. However, the film used in the pre-coating process is pre-coated, and the adhesive used is generally hot melt and solvent volatile. According to the film process of paper printed matter, the film process can be divided into three categories: dry film process. Wet laminating and precoating pressing. Dry laminating method is the most commonly used laminating method in China, which is to coat a layer of adhesive on the plastic film, and then evaporate and dry the solvent in the adhesive through the drying tunnel of the laminating machine, and then bond with the paper printed matter to form a laminating product under hot pressing. Wet film is coated on the surface of the plastic film with a layer of adhesive, in the case of the adhesive is not dry, through the press roller adhesive and paper printed matter bonding, forming a film product. Since the emergence of water-based laminating machine, the process of water-based laminating machine has been popularized and applied, which is closely related to the characteristics of the wet laminating machine, such as simple operation, less adhesive amount, no organic solvent damage to the environment, high strength, high grade and easy recovery. At present, the coating process is more and more favored by domestic packaging manufacturers, and has been widely used in gift boxes, handbags and other packaging. Coating glue manufacturers said that the pre-coating coating method is the coating film manufacturers directly purchase the plastic film coated in advance, and when the film needs to be coated, the film and paper prints are hot pressed on the coating equipment to complete the coating process. The pre-coating process began in the 1990s. The pre-coated film is obtained by applying hot melt adhesive or low temperature resin to the film substrate quantitatively and uniformly with special equipment according to design. According to the coating adhesive manufacturer, the pre-coating coating method eliminates the need for adhesives, preparation, coating and drying, and the entire coating process can be completed in just a few seconds, without polluting the environment, no fire hazards, and no need to clean the coating equipment. At present, the technology has been applied to the field of medicine and food packaging. Sinograce Chemical produces water-based dry laminating adhesive, color box carton, paper product laminating adhesive, which is suitable for all kinds of high-end printed matter, low, medium and high speed laminating machine.

Coated adhesive is generally used in the field of printing, processing the surface of the printed matter, so as to improve the gloss of the printed matter, and play a certain protective effect on the printed matter, coated adhesive refers to the BOPP film on the paper of a kind of glue. Divided into oil-based laminating glue and water-based laminating glue, water-based laminating glue is widely used in China's printing enterprises. Properties of film adhesive The coating adhesive has the advantages of fast drying speed, high brightness, high peeling strength, strong adhesion, resistance to rolling line, smashing and embossing, and good adaptability to hot stamping, gold printing and silver printing. Widely used in book covers, packaging boxes, handbags, exquisite albums and other processing. Feature ● Cost-effective, simple process. ● Easy to use, fast film formation speed. ● Strong adhesion, wrinkle-free film. ● Good comprehensive performance, composite drying fast. The use of film adhesive process and precautions: 1.The way of laminating is dry laminating, which means that the laminating machine should use a dry laminating machine that can be heated by a drying channel and a composite roll. 2.The compound pressure is about 8-20 kg. The drying temperature is about 60-90 ℃. The temperature of the composite pressure roller is about 50-90 ℃. 3.If conditions permit, the glue is baked to seven to 90% dry is appropriate, in this condition, the product after the film is high brightness, stiffness and fastness. In order to prevent bubbles from appearing in the film, the temperature of the composite pressure roller needs to be reduced to below 50 ° C to prevent the glue from being squeezed out. The pressure should be reduced slightly. 4.In order to prevent the discoloration of gold card paper and ink, the glue should be completely dried. 5. When the glue is completely dried, the temperature of the composite pressure roller is as high as possible without burning the film, and the greater the pressure, the better. Sinograce Chemical Co., Ltd. produces water-based coated adhesive, welcome to consult and buy lamination adhesive products

In the post-press process of the printing and packaging industry, the film improves the brightness of the printed matter and enhances the water resistance. It provides a beautiful visual effect for people's life. With the continuous emergence of various processes, equipment and glues, there have been some new trends in post-press coating. First, the proportion of water-based coating is increasing, and the oily coating adhesive is close to fading out of the market. First, the proportion of water-based coating is increasing, and the oily coating adhesive is close to fading out of the market. When the coating process is initially developed, all solvent-based adhesives are used. Generally, it is a one-component SIS oily adhesive and a two-component polyurethane oily adhesive. With the development of science and technology, water-based laminating adhesives have gradually improved and formed, and people have become more aware of the harm caused by solvent-based laminating adhesives: A.It is harmful to the operator, because the benzene and ester in the solvent will enter the human body fluid from the human surface, and then enter the human blood, and the long-term large dose of contact causes too much accumulation in the body, resulting in various diseases. B.Flammable and explosive, high hazard level, domestic and caused heavy losses repeatedly reported. C.high cost. D.Increase VOC emissions and pollute the environment. E.the solvent in the product remains for a long time, endangering later users. The water-based adhesive successfully overcomes the above shortcomings. Second, with the gradual improvement of the production process of water-based laminated adhesive, the cost performance and special performance are becoming more prominent. 1.The earliest application and popularity of water-based laminating adhesives are VAE laminating adhesives. The adhesive has high brightness, strong capping ability and excellent operating performance. However, it has high cost, poor adhesion and poor low temperature resistance. 2.The successful setting and gradual improvement of acrylate polymer emulsion in the film adhesive ushered in the spring for the large-scale promotion of water-based film adhesive. Acrylic resin coating adhesive has strong adhesion, high cost performance and strong adaptability, and successfully overcomes the shortcomings of VAE water-based coating adhesive.

Common problem Cause Solution The middle part of the compound bubbles Add dry oil when brushing Dry and then recombine The amount of glue is too small  Increase glue  Film or print surface contamination or excessive dusting  Dedusting  The overflow on the surface of the rubber roller is not removed, causing the mucous membrane to empty  Cleaning glue roller The pressure is too small, and the air in the glue is not completely eliminated during the film Increase roll The surface of the film is polluted, and the moisture is not enough when the water-based glue is applied Film changing   Concave and convex husking The amount of adhesive film is too small, and the adhesive layer will creep  Change the glue The amount of film is too large, the glue becomes brittle, and falls off after impact  Change the glue The film cutter has burrs or deep indentation  Trimming tool The adhesive layer is not fully cured or the ink is not dry. The recombination time is too close to the indentation  Extended placement time The composite has uneven crimp Excessive film tension, excessive tension during production, post-slitting stress Tone down  Retraction Reverse flat film product The composite changes color after mounting Laminating glue is strongly alkaline  Change the tile glue  Moisture absorption during mounting leads to chemical reaction discoloration, which leads to falling off in serious cases  Change the tile glue  The ink is placed for a long time, and the antioxidants fail  Get a new ink  Composite printing gold color  The copper powder content is too high Reduce the amount of glue, can not be solved then change the dry film glue  Copper powder surface treatment is not good  After compound generally how much time rolling concave and convex is good Composite fastness, in addition to the glue itself, and paper, printed matter, ink, the degree of dryness of the weather and many other factors, in the summer generally three hours after rolling, and in winter, it takes 12 hours to do, in addition should be determined by the specific situation of the composite.