First, the print composite bond is poor 1.Check whether the printed matter itself belongs to special paper; 2.Whether the printing ink is caused by excessive auxiliary materials or special ink; 3.Small amount of glue; 4.Low temperature or small pressure of hot press roller; 5.BOPP membrane corona is processed Second, the brightness of printed matter is poor after composite 1.Printed matter itself, paper, ink; 2.When composite, the temperature of the hot press roller is low; 3.Less colloidal water; 4.Large amount of powder spray; 5.Too little pressure Three, composite products have flower points 1.Uniform strip causes: uneven coating of the roller, cleaning of the scraper is not clean, glue particles or impurities, filtered and then used; 2.When the roller is out of round and unbalanced, the glue is uneven or wavy. 3.Uniform into a ripple: the speed of the rubber roller is too slow or too fast; 4.Uneven flower point: there are stolen goods on the glue roller, there are stolen goods on the surface of the pressing roller, and the glue evenly controls the speed above the glue Fourth, the composite product foaming 1.Printing spray quantity is large, additives are too heavy; 2.Pressing roller temperature is too high; 3.Too much glue water drying or too little glue water; Five, paper wrinkles 1.Whether the printed product is damp and deformed; 2.Whether the cold roller is balanced; 3.Whether the amount of glue is too large; 4.Whether the pressing roll is deformed; 5.Heating roller temperature is too high; 6.Printing ink is not dry; Six, slow speed 1.Large amount of glue, thick glue layer; 2.Drying and heating, low roll temperature; 3.Large amount of ink layer and powder spray; 4.Low glue grade should be upgraded;

As we all know, printed laminating is one of the surface decoration processing technology of printed matter, which is the auxiliary process of printing. It is the plastic film bonded together with the printed matter through the adhesive to improve the surface gloss, strength and aesthetic effect of the printed matter, so as to make it water resistant and wear resistant, which is an effective means to improve the grade and commodity value of the printed matter. So measure the quality of laminating, but also mainly from the brightness of the product, strength, adhesion and other aspects to examine. For the laminating process, it mainly uses film and adhesive two types of materials. The film used for film covering mainly has bidirectional stretching propylene film (BOPP), polyvinyl chloride (PVC), etc., among which BOPP film is the most widely used. The adhesive used in film coating can be divided into oily film coating adhesive and water-soluble film coating adhesive. For water-based glue, the most commonly used in the production of EVA resin (ethylene vinyl acetate copolymer resin), acrylic resin, etc. In terms of its chemical structure, there are single components, there are two components. Since the development of water-based film laminating machine in the 1990s, water-based film laminating process has been vigorously promoted and applied. Water-based film laminating is favored by customers for its high brightness, high grade, easy recycling and no pollution. Since its establishment, Anhui Sinograce Chemical Co., Ltd., has produced many water-based lamp-coated adhesives to meet the needs of customers in various applications, such as wine cases, wine boxes, wine labels, handbags, posters, etc. In this issue, we discuss the water-based film coating process with you in the following aspects: ①Printing powder Because the water-based glue can dissolve the surface of the printing products, so when the coated products appear snowflakes, it is incomprehensible. In fact, the reason is very simple, the water-based glue itself will also be limited by solubility. When the amount of powder sprayed on the printed matter is greater than the dissolving capacity of the glue, the excess part cannot be dissolved or covered by the glue, and a large number of snowflakes will appear. In this case, there are the following solutions: 1.One,Coordinate the upper and lower processes to minimize the amount of powder spraying during printing. Because the powder spraying device and mechanism are not the same, so we are equipped with different production equipment to ensure the quality of products. 2.Two, in the film, the appropriate increase in the amount of glue, increase the ability of glue to dissolve powder. In the actual production, the maximum value of hanging glue is the maximum amount of hanging glue when the edge of the product does not overflow. 3.Three, before the coating will be printed surface suspension powder cleaning, can be taken to wipe the surface by hand,...

With the rapid development of printing and packaging industry, the appearance design of products is becoming more and more high-end. The composite technology used in modern exquisite printing mainly includes: paper printing and plastic film composite and plastic printing and plastic film composite, that is, paper-plastic composite and plastic-plastic composite.As a new type of packaging material, paper paste plastic film has been widely used in book covers, calendars, gift packaging and wine boxes, advertising materials, cards, food packaging and so on, so that the printed matter is beautiful, bright, waterproof and antifouling, to improve the product grade play a beautification and decoration role, so it is widely used by the packaging industry and printing products industry. Laminating glue refers to a kind of glue that combines the film on the paper. Paper-plastic composite is the use of adhesive polypropylene or polyester film and paper printed matter composite together, combined with the advantages of paper and plastic film, so as to make the surface of the printed matter more bright and smooth, make the color more bright and rich three-dimensional sense, but also play a moisture-proof, anti-fouling, anti-counterfeiting, folding and wear-resistant and other functions. Widely used in decorative building materials, packaging materials, hardcover books, product advertising or specifications. With the development of market economy and the improvement of consumption level, film coating is quite extensive. The adhesive used in paper plastic composite is called paper plastic composite adhesive, referred to as paper plastic laminating adhesive.The existing laminating adhesive light transmittance is low, resulting in low appearance brightness, affecting the appearance. The oily laminating adhesive belongs to the single component laminating adhesive, which has the characteristics of fine colloid, high light transmittance, strong adhesion, wide range of application, etc. The paper coated by the technology has high brightness and intensity; The preparation method is a physical process at normal temperature and pressure to reduce production costs. Contact Information Mobile Phone/wechat:+8615755193346 Telephone:+86 0551 63459511

The amount of glue applied is insufficient or uneven Insufficient or uneven amount of glue due to insufficient amount of glue produced by the white spot can be observed in the composite machine. In the dry composite process, the coated adhesive must be able to fill the bumps and bumps on the surface of the ink and film to avoid appearance defects such as obvious white spots.When the water-based adhesive dry composite is used to produce lightweight packaging products, the economic coating amount of water-based adhesive is 1.8 ~ 2.2g/m2, and the working concentration is 42% (the working concentration of different brands of water-based adhesive may vary), and the number of lines is 180 lines/inch, and the depth of the mesh hole is 32μm.Due to the large opening degree of the net hole on the roller, if the surface of the roller is worn, it will have a more obvious impact on the amount of glue. Therefore, in the dry composite process of water-based adhesives, the operator should often detect the actual amount of glue applied by the roller to avoid insufficient amount of glue applied due to excessive wear of the roller. In addition, the uniformity of the amount of water-based adhesive is also a very key factor, if the coating is not uniform, there will inevitably be a small amount of local glue, resulting in white spots. Therefore, we should pay special attention to the following two issues: ①The assembly of the scraper should be flat and straight, without distortion, and the Angle and pressure of the scraper should be adjusted appropriately to ensure uniform scraping effect; ②During normal production, the scraper should keep the left and right strings to avoid the wear of the rubber roller in a fixed position. Poor level of glue Because water-based adhesives are not like solvent-based adhesives, they can achieve a better leveling effect under the action of their own gravity and surface tension after coating, so when coating water-based adhesives, it is necessary to use a flattening roller to flatten the adhesive. The speed, pressure and surface cleanliness of the flattening roller are related to the leveling effect of the water-based adhesive, and the rotation direction of the flattening roller should be opposite to the compound direction, otherwise the flattening effect cannot be achieved, and the speed should be slightly higher than the compound speed. The leveling effect of the water-based adhesive is also affected by the surface tension of the coated film. Since the surface tension of the water-based adhesive is obviously higher than that of the solvent-based adhesive, the surface tension of the ink on the coated film is required to be not less than 38mN/m, otherwise the water-based adhesive will automatically shrink after coating and cannot be continuously formed. Therefore, the operator should pay attention to the detection of the surface tension of the coated film. In addition, if the surface of the coated film is not clean, adhering to substanc...