What is lamination?
        Laminating is to apply a binder to a plastic film by a water-soluble laminating machine, and then combine it with a printed matter using paper as a substrate, pressurized by a rubber roller and a heated roller, and form a product of paper and plastic. Due to the thin and transparent plastic film on the surface of the printed product, the surface is smoother and brighter, which not only improves the gloss and fastness of the printed product, but also extends the service life of the printed product. At the same time, the plastic film is waterproof and Protection against dirt, abrasion, folds, and chemical corrosion.
        What is a laminating machine?
        The laminating machine can be divided into two categories: instant coating laminating machine and pre-coating laminating machine. Instant coating laminating machine includes three parts: gluing, drying and hot pressing. It has a wide range of application and stable and reliable processing performance. It is currently widely used in China. Pre-coating laminating machine, no gluing and drying parts, small size, low cost, flexible and convenient operation, not only suitable for laminating processing of large batches of printed products, but also suitable for laminating small batches and scattered printed products such as automated desktop office systems Processing is very promising.

        Laminating machine is a kind of special equipment for paper, board and film laminating. It is combined with rubber roller and heating roller to form a product of paper and plastic. Next, let's talk about the maintenance and repair of the rubber roller of the laminating machine.
        1. When cleaning the rubber roller every day, it must be carefully cleaned, otherwise the surface layer of the rubber roller and the pigment and resin will be oxidized to create a smooth and hard film, which will cause the surface vitrification and affect the ink transfer. If it is not cleaned frequently, the surface of the rubber roller of the laminator will be uneven and not easy to use. Therefore, the rubber roller should be cleaned and put aside when it is stopped.
        2. The rubber roller of the laminating machine is aged for a long time, coupled with the corrosion of chemicals, causing the "slag" of rotten rubber. It is best not to use such rubber roller, otherwise it will seriously affect the quality of the print.
        3. In order not to affect the production and printing quality, there must be spare ink rollers, but do not store too much to avoid aging. The storage environment of the rubber roller is the same as the blanket. In addition, the rubber roller should be placed straight at the journal, and the surface should not touch each other or other objects to avoid deformation of the rubber roller.
         4. The rubber roller of the laminating machine should not be stored near the large electric idea and generator. Due to the large amount of ozone generated by these devices, the surface of the rubber roller will age and crack.
        5. When the weather is very cold, the ink is uneven, and auxiliary materials can be added to the ink appropriately. It is forbidden to use infrared heaters and other equipment to bake the ink rubber roller to prevent the rubber roller from oxidation.

        There are many factors involved in the process of the automatic laminating machine. It is necessary to understand the influence of each process parameter on the quality of the laminating film, and correctly handle the relationship between them to achieve the best effect. The technical parameters and precautions involved in the laminating process of the automatic laminating machine are as follows:
        1. Drying temperature-controlled between 50 ~ 70 ℃, can fully evaporate the solvent, and will not cause the film to overheat and deform;
        2. Compound temperature-the temperature of the imprint cylinder is controlled at 70 ~ 90 ℃, which can melt the adhesive and the film will not be deformed by overheating;
        3. Compound pressure-to ensure that the axial pressure of the impression cylinder is consistent, the pressure should be kept within 150 ~ 250 kg / cm2;
        4. Adhesive coating-the coating should be thin, controlled at 3 to 8 g / cm2, and the thickness should be 5 to 8 μm, to avoid excessive coating;
        5. Machine speed-a single sheet of paper should be controlled at 35 to 45 sheets / minute, and a roll of paper should be at 3 to 10 meters / minute, in addition to other parameters;
        6. Film tension-the tension is adjusted to the minimum to achieve the correct coating and compounding, to avoid excessive tension;
        7. Accuracy of the cylinder-The impression cylinder requires a smooth and clean surface without scratches or pits. It is necessary to ensure mechanical accuracy indicators such as ellipticity and concentricity;
        8. Environmental factors-to keep the environment clean, air purification devices are required. Control workshop temperature and humidity to prevent deformation of paper or film;
        9. Ink thickness——Deep ink and light printing, to avoid the surface tension drop caused by too thick ink layer and make the laminating film not firm;
       10. Ink drying-the ink should be dried thoroughly to avoid blistering;
       11. Ink additives-the amount of desiccant should be controlled to prevent the ink layer from crystallizing. The film surface of the crystallized ink of the automatic laminating machine will have a laminating phenomenon.

        By applying an automatic laminating machine to cover the printed matter, the brightness of the printed matter is greatly enhanced, so that the printed matter can achieve the anti-dirt, waterproof, anti-discoloration and heat-resistant, light-resistant and wear-resistant process effects, which improves the product The beauty of the product enhances the service life of the product. Therefore, it is very important to ensure the quality of the coating process. So, how does the automatic laminating machine avoid wrinkling?
        The product to be constructed by the automatic laminating machine must be straight. Handle uneven paper with "ruffled edge" and "tight edge" phenomena. Paper with "ruffled edges" can be baked, and paper with "tight edges" can be hung to dry. Be sure to wait for the blot to dry before coating, otherwise it will cause blistering or hair pulling.
        The paper used in the automatic laminating machine is generally coated paper, offset paper, and whiteboard paper. The paper wrinkle phenomenon that occurs during lamination is generally in the following situations:
        1. Improper temperature and humidity control in the workshop. When the relative humidity is too high, the paper absorbs moisture and starts to "ruffle", causing the paper to wrinkle during the lamination process, and the temperature and humidity of the workshop must be strictly controlled.
        2. If the ambient temperature is too high or the laminating temperature is too high, the paper will “tighten” and cause the paper to wrinkle. It can be flattened with a pressing plate, increase the number of times of knocking and kneading the paper before laminating, and reduce the environment and the temperature of the laminating.
        3. The uneven pressure of the roller causes the paper to wrinkle during the lamination process. In this case, the pressure of the roller should be corrected before starting operation.

        Can glazing replace laminating? In fact, in addition to the laminating process of the laminating machine, UV glazing can also play a certain role in protecting and decorating the surface of the printed matter. The two are very similar in many functions. Due to the relatively low cost of UV glazing, the development is relatively fast, and the product is very attractive, so it also has a certain market share in some post-press processing fields. Some people who are optimistic about UV glazing technology even believe that this technology can replace the coating technology and develop independently.
        In fact, this is just a wish of people. According to some printing companies that have applied UV glazing technology, the most widely used UV glazing is local glazing. Local UV glazing can improve the grade of books, but in most cases, this local UV glazing process is also in It is carried out after laminating the laminating machine, and the previous laminating process must be solvent-based laminating.
        In addition, there are still many deficiencies in UV glazing compared with laminator lamination. For example, the protective effect, folding endurance and abrasion resistance of UV glazing are not as good as those of film coating, and there are limitations in many fields, such as packaging boxes. UV glazing also needs to be invested in printing equipment and UV curing equipment, and the film has a ready-made equipment foundation and mature technology; in addition, some UV varnish will also volatile odors during the coating process, affecting the operator.
        Today's printing houses and publishing houses attach great importance to this process, and believe that in the printing of books and periodicals, UV glazing can replace the laminating process. However, in general, UV glazing still has limitations in many aspects, there are still many problems in the process, and it can not completely replace the coating process.