The pre-coated laminating machine combines it with the printed matter using paper as the substrate, after being pressed by the rubber cylinder and the heating cylinder, to form a paper-plastic product. 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.
        In recent years, the coating is basically using a pre-coating film. Because it is not used for a long time and there are many problems. According to the process practice, the quality of the pre-coating film is mainly affected by temperature and pressure. The three factors of speed, so correctly handling the relationship between the three, is essential to ensure the quality of the pre-coating film and the impact on the production of the next process. Paper-plastic coating is the comprehensive result of the physical function of thermocompression bonding. Temperature, pressure, and speed are the three basic factors for achieving this physical comprehensive effect. Correctly handling the relationship between the three is the key to the process operation technology.

        Temperature: It is the first key to coating. The adhesive used for pre-coating is hot melt adhesive. The temperature determines the melting state of hot melt adhesive, the leveling performance of hot melt adhesive, and the molecular orientation of hot melt adhesive. The diffusion ability of three substances, such as BOPP film, printing ink layer, paper substrate, etc., also determines the crystallinity of the hot melt adhesive. Only by correctly controlling the temperature of the working area can the solid heat of the pre-coated film on the film be made The melted adhesive layer is completely melted into a viscous state, with suitable fluidity to achieve wetting and bonding to the surface of the printed matter, and at the same time to ensure immediate solidification after compounding. The laminated film product has a smooth appearance, bright enough, and the adhesive layer is well melted. No creases. And can peel the ink. The temperature control of the lamination process also affects and determines the hot-melt adhesive used in the lamination process to solve the changes when heated, and the resistance to the new heat. Therefore, strict temperature control is the primary key to pre-coating. According to our practice. Temperature control in the range of about 80 ~ 100C is more appropriate.