The automatic laminating machine is divided into three parts: gluing, drying tunnel and hot pressing.
(1) Glue part
The gluing part is equipped with an adjusting device to adjust the amount of gluing to meet the requirements of different printed parts. The gluing roller adopts rubber roller or steel roller.
(2) Drying tunnel part
The drying tunnel is generally 2~3m long. The drying tunnel entrance of the automatic laminating machine is provided with an infrared lamp tube and an electric fan. There is also a high-power electric heating tube and exhaust fan on the upper part of the drying path of the automatic automatic film laminating machine. The temperature can be adjusted to dry the adhesive and eliminate the exhaust gas.
(3) Hot pressing part
This part is the key to the coating, which is directly related to the adhesion fastness of the coating product. The principle of hot pressing is that the adhesive can quickly infiltrate and penetrate into the surface layer of the printed matter in the molten state, so as to obtain a strong bonding interface layer. The hot pressing part consists of a set of rollers. One of the hollow metal rollers is equipped with an electric heating tube, and the temperature can be controlled automatically. The pressure of this group of rollers can be adjusted.

1. The drying temperature is controlled between 50-70℃, which can fully evaporate the solvent without causing the film to overheat and deform;
2. Compound temperature The temperature of the impression cylinder is controlled at 70-90℃, which can melt the adhesive and the film will not be deformed by overheating;
3. Compound pressure Ensure that the axial pressure of the impression cylinder is consistent, and the pressure should be kept within 150-250kg/cm2;
4. Adhesive coating The coating should be thin, controlled at 3-8g/cm2, and the thickness is 5-8μm, to avoid excessive coating;
5. Machine speed: The single sheet of paper should be controlled at 35-45 sheets/minute, and the roll paper should be at 3-10 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. Cylinder accuracy The impression cylinder requires a smooth and clean surface with no 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 should be 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 Ink drying should be thorough to avoid blistering;
11. Ink additives To control the amount of desiccant added to prevent the ink layer from crystallizing. The surface of the crystallized ink will have a loose film.

The pre-coating film laminating machine is a special equipment that combines printed materials with pre-coated plastics. Compared with the instant laminating machine, its biggest feature is that there is no sizing and drying parts. Therefore, this type of laminating machine has a compact structure, small size, low cost, easy operation, and good product quality stability.
The pre-coated film laminating machine consists of four main parts: pre-coated plastic film unwinding, automatic print input, hot-pressing zone compounding, and automatic rewinding, as well as mechanical transmission, pre-coated plastic film flattening, vertical and horizontal slitting, and computer control system And other auxiliary devices.
1. Print input section. 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 the printed product with a small composite format.
2. Compound part. Including composite roller group and calender roller group (Figure 11-7). 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 and sampled by the sensor and the computer Correct at any time; the adjustment of compound pressure adopts eccentric cam mechanism, and the pressure can be adjusted steplessly. The schematic diagram is as follows: the calender roller group is basically the same as the compound roller group, that is, it is composed of chrome-plated pressure roller and silicone pressure roller, but without heating device. The main function of the calender roller group is: after the pre-coated plastic film is combined with the printed matter 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 group 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 motherboard, a digital key board, an optical isolation board, a power board, and a stepper motor power driver board.

The laminating machine refers to the transparent plastic film is pasted on the surface of the printed matter by hot pressing to form a 10-20um film, which protects the printed matter and increases the gloss of the printed matter. It is also known as laminating. The laminating process is widely used for surface binding and protection of book covers, picture albums, commemorative albums, postcards, product manuals, calendars and maps.
According to the different raw materials and equipment used, the film coating process can be divided into coating film process and pre-coating film process. Instant coating refers to the process of using plastic film as the raw material during the laminating operation, applying adhesive on it, drying it, and then hot-pressing the plastic film and the printed product. The pre-coating type refers to a process method in which a plastic film pre-coated with an adhesive and dried is used as a raw material, and is directly subjected to hot-press lamination with printed products.
The laminating process is mainly divided into semi-automatic laminating machine and fully automatic laminating machine. Although the specific operations of semi-automatic and full-automatic are somewhat different, the principle is the same: the adhesive is applied to the plastic film by a roller coating device, and the film is softened by the heat and pressure roller, and then the bottom is coated The printed material and the film are pressed together to form a paper-plastic integrated film product.

The laminating of the automatic laminating machine is to coat the plastic film with the adhesive, and to print it with paper as the substrate, using the rubber pre-coating laminating machine, the laminating is to coat the plastic film Agent, and it is combined with the printed matter using paper as the substrate, after being pressed by the rubber cylinder and the heating cylinder, to form a product of paper and plastic. The printed product after the film is coated with adhesive, because the surface has a thin and transparent plastic film, 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 The film also plays a protective role such as waterproof, anti-fouling, abrasion resistance, folding resistance, and chemical resistance.