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.

Whether the water-based film adhesive meets the quality requirements of composite products, in addition to the quality of the glue itself, but also related to the paper, film, equipment accuracy, operating experience and other supporting factors in the film coating process, after long-term practice, we summarized the common problems in the application of water-based film adhesive, and put forward the production reasons and solutions, to help the film coating personnel quickly find a solution. Common Problem Cause Solution Combination fastness is not good The membrane surface tension is not enough Test the fitting surface ≥39 Dynes with Dyne pen before use Excessive ink thickness Lengthen the time after fitting The amount of glue is too small Increase the amount of glue appropriately Compound pressure is too small Increase pressure appropriately Radial fringe Using glue is too thick - causing stringing The glue itself thickens and changes the glue After the empty machine runs for a long time, the rubber tank thickens with new glue Compound pressure is too small Increase pressure appropriately Uneven or radial scratch on the surface of the roller - uneven thickness of the glue Smooth the top roller or replace it with a roller The film itself is curled and uneven - resulting in uneven gluing Flatten or replace the film with a new one Composite diagonal stripes The tension between the left and right sides is inconsistent when the film is removed Adjust tension until removed The pressure at both ends of the film is inconsistent The tension at both ends is inconsistent during winding The top roller has a taper - resulting in a different amount of glue, resulting in a variation in friction The lack of equality of each guide roller leads to oblique wrinkles The laminating board is uneven Too much winding tension - film strain Tone down The linear speed of the press roll is different from that of the cardboard transfer Fix a machine Wire plate uneven - deformed after moisture absorption Dry and recombine Excessive machine jitter Finishing machine Roller pressure is too low Increase roll The cardboard is husked along the radial edge Cardboard deformed by moisture - flounces Let dry before recombining Too little glue Increase glue Excessive machine jitter Reinforce the machine The edge of the roller overflow rubber dust in time to remove - edge Degumming

In the actual operation of our manufacturer, whether the laminating products can normally complete the factory and meet the requirements of customers, in addition to the quality of the laminating glue itself, it is also related to the supporting factors such as paper, film, equipment accuracy, environment, and operating experience in the composite process. Often in some small details, it will cause unnecessary mistakes, which delays the time and increases the cost, which can be described as losing the wife and folding the army. Next, we will teach you a few tips to save costs. 1.The storage of glue is very important, should be placed in a suitable place according to the product instructions for storage, sunscreen and antifreeze, avoid direct sunlight and other requirements, the remaining glue after use should also be sealed and stored to prevent crust and mold, shorten the shelf life, resulting in unnecessary waste. 2.After the printing ink of the product to be printed, it must be dry and coated with film adhesive. 3.The coating roller of the laminating machine must be cleaned before use to ensure that no other impurities are attached to it. 4.Different coated adhesives should not be mixed and used at the same time to prevent adverse chemical reactions and losses. 5.If there is dust on the surface of the print, in principle, it should be wiped clean in the coating, if the dust is small, you can choose the special adhesive for the coating powder.