Main factors affecting the quality of pre-coated film
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Paper-plastic coating will be the comprehensive result of the physical function of hot pressing. Temperature, pressure and speed are the three basic factors to achieve this physical comprehensive effect. Correctly handling the relationship between these 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. Temperature determines the melting state of hot melt adhesive, determines the leveling performance of hot melt adhesive, and determines 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, while ensuring immediate curing after compounding, so that the laminated film product has a smooth appearance, bright enough, and the degree of melting of the adhesive layer No creases. And can peel off the ink.
The temperature control of the coating process also affects and determines the hot-melt adhesive used for the coating 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. It is more suitable to control the temperature in the range of 80 ～ 100 ℃.
Pressure: Appropriate pressure should be used while correctly controlling the lamination temperature, because the surface of the paper itself is not very smooth, only under the pressure, the hot melt adhesive in the state of viscous flow will drive away the air on the surface of the printed matter. Fully wet the paper print surface.
Produce colloid molecules to the ink layer of paper printed matter, paper molecules, dislocation, and achieve good adhesion, forming a complete coverage of the entire surface of the printed matter, so that the printed matter is bright, no fog, leveling of the glue layer, no creases , The bonding effect is good, and the pressure should be increased properly without wrinkling, so that the thermoplastic curing function of the hot melt adhesive can be fully expressed, so as to ensure that the film products are added to the various processes after compounding. The physical peeling, impact force and other influences have strong resistance capabilities (such as indentation, bronzing, hot melt adhesives, etc.) to achieve the perfect uniform speed of the internal structure and surface state of the composite printed matter.
Paper lamination is a dynamic compound motion. The speed of the paper determines how long the paper-plastic composite stays on the thermocompression bonding interface, and also determines the input temperature, pressure, and temperature of the laminating machine. The actual action value of the paper-plastic composite in the actual production process.
When the temperature and pressure of the film are fixed, the change of speed will change the effect of the film, and due to the upper limit of temperature and the limitation of pressure supply, it will only change from the direction less than the set value, and with the speed, The decrease rate is obvious, and the hot pressing force declines, which makes the composite effect worse. The running speed is too fast, the bonding is not strong, there will be mist, and if it is too slow, it will be inefficient and even bubbly. Therefore, the compound running speed determines the time for the pre-coated film and paper print to achieve bonding. According to our experience, the general speed control is more suitable for about 10-20 sheets of paper in one minute. (The speed of the electronic laminating machine should be slower due to the smaller heat pressing roller)
The actual action value of the three factors of temperature, pressure and speed has a certain range. Due to the different equipment, we need to find the best effect value in practice to ensure the composite effect of the pre-coating film and create favorable conditions for the spine of the cover of the next step of the nail cover to not leave the shell and not foam.