As the saying goes: People rely on clothing, Buddha relies on gold. Of course, beautiful things must be decorated with beautiful appearance. For example, famous cigarettes and fine wines have gorgeous outer packaging, and the peritoneal technology is becoming more and more mature, and the peritoneal equipment is more and more advanced. Laminating equipment is divided into two categories: instant coating laminating machine and pre-coating laminating machine.
        Pre-coated laminating machine without gluing and drying parts, small size, low cost, flexible and convenient operation, not only suitable for laminating processing of large quantities of printed products, but also suitable for laminating processing of small batches and scattered printing products such as automated desktop office systems. At present, advanced pre-coating laminators with computer control have been produced in China. Instant coating laminating machine has wide application range, stable and reliable processing performance, and is a widely used laminating equipment.
        1. Pre-coating film equipment
        The pre-coating laminating machine is a special equipment that combines printed materials with pre-coated plastics. Compared with the instant coating laminator, the biggest feature is that there is no sizing and drying parts, so this type of laminator is compact in structure, small in size, low in cost, easy to operate, and has good product quality stability.
        The pre-coating laminating machine consists of four main parts: pre-coating plastic film unwinding, automatic input of printed matter, hot-press area compounding, and automatic rewinding, as well as mechanical transmission, pre-coating plastic film flattening, vertical and horizontal slitting, and computer control system And other auxiliary devices.
        1. Print input part. The automatic conveying mechanism can ensure that the printed products do not overlap and enter the composite part at an equal distance during transmission. Generally, pneumatic or friction methods are used to achieve control. The conveying is accurate and high precision. The same requirements can also be met when printed products with small composite width.
        2. Compound part. Including composite roller group and calender roller group. The composite roller set is composed of a heating pressure roller and a silicone pressure roller; the thermal pressure roller is a hollow roller with a heating device inside, the surface is forged with hard chromium, and is polished and finely ground; the temperature of the thermal pressure roller is tracked by the sensor and sampled by the computer Correct at any time;
        The compound pressure is adjusted by an eccentric cam mechanism. The pressure can be adjusted steplessly. The schematic diagram is as follows: the calender roller group is basically the same as the composite roller group, that is, it is composed of a chrome-plated pressure roller and a silicone pressure roller, but there is no heating device. The main function of the calender roller group is: after the pre-coated plastic film and the printed matter are compounded by the composite roller group, the surface brightness is not high. After the secondary extrusion of the calender roller group, the surface brightness and adhesion strength are greatly improved.
        3. Transmission system. The transmission system is driven by a computer-controlled high-power stepper motor. After one-stage gear reduction, it is driven by a three-stage chain to drive the movement of the paper feed mechanism and the rotation of the silicone pressure roller of the composite part and the calendering mechanism. The pressure roller set maintains a suitable working pressure under the action of steplessly adjusted pressure.
        4. Computer control system. The computer control system uses a microprocessor, and the hardware configuration is composed of a main board, a digital key board, an optical isolation board, a power board, and a stepper motor power drive board.
        2. Coating equipment
        Instant coating film laminating machine is a special equipment that applies the adhesive to the reel plastic film after drying it, and then presses the composite part together with the printed matter. That is, Xu-type laminating machine has two kinds of automatic machine and semi-automatic machine. Each type of machine has its unique features in structure and lamination process, but its basic structure and working principle are the same. It is mainly composed of five parts: unwinding, sizing, drying, compounding, rewinding, and mechanical transmission. , Automatic control of tension, automatic deviation adjustment of unwinding and other auxiliary devices.
        1. Unwind part. The unwinding of plastic film requires that the film always maintain a constant tension. If the tension is too large, it is easy to produce longitudinal wrinkles, otherwise it is easy to produce horizontal wrinkles, which are not conducive to the coating of adhesives and the compound with the printed matter. In order to maintain the proper tension, the unwinding part is generally equipped with a tension control device. Common ones include mechanical friction disc clutches, short-circuit AC motors, and magnetic powder clutches.
        2. Coated parts. After unwinding, the film passes through the coating roller and enters the gluing part. The coating forms are: roller reversal type, concave type, direct glue without scraper and direct glue with scraper, etc.
        A. Roller reversal glue application. It is an indirect glue coating, which is the most widely used by various models. The glue supply roller brings out glue from the glue storage tank, and the glue scraping roller and the glue plate can scrape the excess glue back to the glue storage tank. The film counter-pressure roller presses the film to be applied to the surface of the glue roller after the glue is homogenized, and maintains a certain contact area, and the glue solution is continuously applied to the film surface under the action of pressure and adhesion. The amount of glue can be changed by adjusting the distance between the rubber roller and the rubber roller, and the rubber roller and the rubber sheet.
        B. Concave glue application. It is composed of a metal rubber roller with a surface engraved on the surface and a group of film partition rollers. The gumming roller is directly immersed in the glue liquid, and the glue liquid is taken out from the glue storage tank with the rotation of the roller, and the excess glue liquid on the surface of the roller is scraped off by a scraper. Under the action of the film pressing roller, the glue in the groove of the roller is driven by the film to be coated which is directionally moved and is evenly spread on the film surface. The amount of glue can be controlled by adjusting the grid pattern on the surface of the coating roller shaft, the characteristic value of the adhesive, and the pressure value of the laminating roller.
        The advantage of concave coating is that the amount of coating can be controlled more accurately and the coating is uniform; however, the anilox roller is difficult to process and easily damaged, and needs to be cleaned frequently. In addition, the coating requires higher adhesives.
        C. No-squeegee roller extrusion coating. The glue roller is directly immersed in the glue liquid. During the coating, the glue roller brings out the glue liquid and passes through the glue roller. After the glue is evenly glued, the glue is applied by the pressing force between the film pressing roller and the glue roller.
        During extrusion, the pressure, adhesive performance index and coating speed determine the thickness of the adhesive layer. The amount of glue applied is achieved by adjusting the squeezing force between the glue roller and the glue roller, the glue roller and the laminating roller. Therefore, there are high requirements on the surface accuracy, cylindricity and radial runout tolerance of each roller.
        D. Squeegee directly apply glue. The glue roller is directly immersed in the glue solution and continuously rotates to drive the glue solution from the glue tank. After removing the excess glue solution by the scraper, it comes into contact with the film surface to complete the glue application.
        There is a direct glue application method of the doctor blade. The design requires the doctor blade to scrape the glue on the surface of the glue roller, that is, the straightness of the edge of the doctor blade and the surface accuracy of the glue roller are quite high. The squeegee is generally made of stainless steel belt with high flatness, smoothness and good elasticity.
        3. Dry part. The adhesive coating applied to the surface of the plastic film contains a large amount of solvent and has a certain fluidity. It must be dried before compounding. The drying part is mostly tunnel type, and the length of the drying tunnel is between 1.5 and 5.5m depending on the model. According to the solvent evaporation mechanism, the drying tunnel is designed into three zones:
        A. Evaporation area. This area should form turbulent wind on the film surface as much as possible to facilitate solvent evaporation.
        B. Aging area. The automatic temperature control zone is set according to the properties of the film and the adhesive, and is generally controlled at 50-80 ° C. The heating methods include infrared heating and direct radiant heating of the electric heating tube. The automatic balance temperature control is realized by the heat-sensitive components installed in the curing zone.
        C. Solvent exclusion zone. In order to eliminate the solvent volatilized from the drying of the adhesive and reduce the vapor pressure in the drying tunnel, the area is designed with an exhaust air extraction device, usually a fan or an induced draft fan.
        4. Compound part. It is mainly composed of chrome-plated hot press roller, rubber pressure roller and pressure adjustment machinery.
        A. Hot pressing roller. The hot roller is a hollow roller with an electric heating device inside. The roller temperature is controlled by sensors and instruments on the console. The surface state and thermal power density of the heat press roller have a great influence on the quality of the film-coated product. The general lamination process requires a hot pressing temperature of 60-80 ° C and an area heat flow of 2.5-4.5W / cm2.
        B. Rubber pressure roller. Press the coated product against the heat press roller with a certain pressure to make it solidify and stick firmly. The contact pressure during compounding is closely related to the adhesive strength and appearance quality, and is generally 15.0 to 25.0 mPa. Rubber pressure rollers work under high temperature for a long time, but also to keep the roller surface smooth, smooth, small lateral deformation, good tear resistance and peelability, so silicone rubber with better tear resistance is mostly used.
        C. Pressure adjustment mechanism. Used to adjust the pressure between the heat pressure roller and the rubber pressure roller. The pressure adjustment mechanism can adopt a simple eccentric mechanism, eccentric cam mechanism, screw rod, nut mechanism, etc. However, in order to simplify the mechanical transmission parts and improve the pressure control accuracy, most of them currently use hydraulic (gas) pressure type pressure adjustment mechanism.
        5. Print input section. There are two methods of manual printing and automatic input. The automatic input method is divided into two types: pneumatic and friction. Pneumatic type is to install a row of suction nozzles on the front or rear of the printed matter, relying on the "suction", "put" and movement of the nozzle to separate and deliver the printed matter. The friction input mainly relies on the reciprocating movement of the friction head or the fixed rotation to produce friction with the printed matter, separate the printed matter from the paper storage table, and convey it forward; the friction wheel rotates intermittently in one direction, and separates one printed matter every rotation.

        6. Rewind part. The laminating machine mostly adopts an automatic winding mechanism, and the winding shaft can automatically wind the compounded product into a roll shape. In order to ensure that the winding is tight and consistent, the winding shaft and the compound linear speed must be synchronized, and the tension should be kept constant during winding. As the winding diameter increases, its linear velocity must continue to be synchronized with the compound linear velocity. Generally, machines use frictional damping to change the angular velocity of the winding shaft to meet the above requirements. In order to improve work efficiency, some film laminating machines are also equipped with quick unwinding and finished product cutting devices in the winding part.