The laminating machine manufacturer explained that for the laminating process, it mainly uses two types of materials: film and adhesive. The films used for coating mainly include bidirectional stretched acrylic film (BOPP) and polyvinyl chloride (PVC), among which BOPP film is the most widely used. Adhesives used in laminating can be divided into oily laminating adhesives and water-soluble laminating adhesives. For water-based glues, the most commonly used in production are EVA resin (ethylene vinyl acetate copolymer resin), acrylic resin, etc. In terms of its chemical structure, there are one-component and two-component, through the following aspects and Let's discuss together:
         ①Printing powder
         Because the water-based glue can dissolve the powder sprayed on the surface of the printed product, when the snowflake point appears on the film-covered product, it is incomprehensible. In fact, the reason is very simple. The water-based glue itself is also limited by the solubility. When the amount of powder sprayed on the printed matter is greater than the dissolving power of the glue, the excess part cannot be dissolved or covered by the glue, and a large number of snowflake spots will appear. In this case, there are several solutions:
        1. Coordinate the upper and lower processes to minimize the amount of powder sprayed during printing.
        2. When laminating, increase the amount of glue properly and increase the ability of the glue to dissolve the powder. In actual production, the maximum amount of glue is to reach the maximum amount of glue when the product edge does not overflow.
        3. Clean the suspended powder on the surface of the printed matter before laminating, you can wipe the surface manually, or install other powder removal devices on the machine.
        ②Clean
        The laminating machine manufacturer explained that because the water-based laminating adhesive dries quickly, if it is still and does not flow, and it is exposed to the air for too long, it will dry and form a skin, which will be attached to the rubber coating roller or the pressure roller, resulting in partial coating. Or the glue layer is too thin, which also causes local pressure to increase, so keep the glue roller and pressure roller clean during the laminating process. In addition, there is too much dust in the surrounding environment or there is dry rubber and cut in the glue. The film fragments underneath will also affect the quality of the film, so it is necessary to pay attention to cleanliness and hygiene, and pay attention to the storage of glue. You can add a filter device for glue in the actual and production process.
        ③ Paper-plastic separation
        The phenomenon of paper-plastic separation is easy to appear in products with a large printing area and large solid areas. Because the surface ink layer is thick, the glue is difficult to wet, diffuse, and penetrate, so the adhesion is not strong. The solutions are:
        1. Check the production date and shelf life of the glue to see if the glue has deteriorated.
        Second, whether the film is within the shelf life, what is the surface corona value.
        3. Refer to the technical indexes of the glue, whether it is operated correctly according to the regulations in actual production
        4. Replace other brands of glue with large viscosity.
        5. Improve the environmental humidity when the film and product are dry.
        ④ deformation
        There are several reasons for the deformation:
        1. The amount of gluing is too large, the paper absorbs moisture and deforms, so under the prerequisite of ensuring product quality, the amount of gluing should be reduced as much as possible.
        Second, the film is seriously stretched and deformed. At this time, the loose tension of the film should be adjusted appropriately. The smaller the tension, the better the film should be evenly attached to the paper.
        3. The winding tension is too large. At this time, according to the situation, when ensuring that the product is transported and wound onto the roller, the smaller the tension, the better.
        4. The temperature and humidity of the external environment where the product is located vary greatly.

        In general, with the rapid development of the printing and packaging industry, the continuous innovation of processes, the continuous emergence and replacement of new materials, we will also face new problems and new challenges. Laminating machine manufacturers will also follow the pace of the times and seek higher development.