The hot laminating machine is actually a cold laminator that is not heated and adopts a cold pressing process or a low temperature cold laminator. It is also called a hot laminator. This type of hot laminator is mostly a pre-coating laminator. There are many laminators on the market for the mounting of the dedicated hot film when it is heated to a certain temperature (about 100-180℃), but the heating method and heating performance are not the same. Many hot laminators are only It can be heated to 130°C. Although many hot laminating machines use silicone rollers for heating rubber rollers and indicate high temperature resistance to 200°, it is important to know that the thermometer measures the surface temperature of the rubber roller when it reaches 30-50°C. , The internal iron core may have reached more than 100 ℃, so the heating temperature of many thermal laminating machines generally does not exceed 130 ℃, and the thermal laminating machine with a heating temperature of 150 ℃ is already very good.
Rubber laminating rollers and silicone rollers are commonly used in hot laminating machine rubber rollers. The heating performance of the hot laminating machine rubber roller and the hot laminating machine are closely related. If the quality of the laminating machine rubber roller is not good, it is not suitable. The temperature and pressure of the lamination will seriously affect the peritoneal effect of the laminator. Everyone knows that uneven pressure of the roller and unevenness of the rubber roller will cause wrinkling during lamination. Jintu multifunctional professional cold and hot laminating machine uses customized professional-grade 130mm diameter weighted high-quality rubber rollers, which uses fast preheating and high efficiency internal heating roller heating methods, and the temperature can be adjusted freely, thus ensuring different The film is stable and suitable for all kinds of different materials to meet various professional film requirements. And because the process of coating is generally divided into cold treatment, heat treatment, low temperature treatment, etc., different treatment methods need to be selected according to the characteristics of the material to be processed, and there may be one or more working temperatures to meet the needs of the coating work.

The effect of the hot laminating machine directly affects the quality of the printed matter and directly affects the interests of customers.
In the pre-coating film laminating machine, the glue is melted by heating, and then the film is adhered to the printed matter by pressurization. The single-sided film curling of the small pre-coating type thermal laminating machine has always been a headache. What is the reason for the single-sided film curling of the film machine?
After many times using small pre-coating hot laminating machines, after experimenting with printing materials of various materials, we found that the single-sided laminating film curled generally showed curling in the direction of the film, which could not be kept flat and wrinkled. If the mark is serious, it will automatically curl into a cylindrical shape, which will affect the effect of subsequent processes. The main reasons for single-sided film curling:
1. The coated paper is too thin; although the current laminating machine is suitable for laminating paper prints of various materials, the thinner the paper, the easier it is to deform and curl
2. The paper has much water content and high humidity; the paper is loose and flat. Laminating machine should also pay attention to the direction of the paper strands, especially thick paper, to reduce the phenomenon of paper curling caused by rolling and stretching.
3. The pressure of the hot laminating machine is high, the temperature is too high, and the time is too long. The current working temperature and working speed of the hot laminating machine can be adjusted freely. For the lamination of various printed products, the selection and setting should be based on different materials. Set temperature and speed.
Product quality standard of hot laminating machine: the surface is clean, flat, no blur, good finish, no wrinkle, no foam, no paper-plastic separation, no powder foil marks. The degree of drying is appropriate, and there is no phenomenon of sticking the surface film or paper. Handle the relationship between the temperature, pressure and time when the paper and plastic film pass through the hot pressing mechanism during the laminating process. Pay attention to adjusting the temperature, mechanical pressure and mechanical speed of the heat roller to avoid blistering and paper during laminating Problems such as poor plastic adhesion.

During the use of the pre-coating film laminating machine, occasionally some faults will appear. Let's take a look at how to eliminate some common faults.
First, the machine does not start: the input wire is not connected, the power cord is reversed, and the voltage is not enough.
2. Inaccurate temperature measurement: thermocouple, temperature controller. Whether the installation is incorrect and damaged.
3. The working vacuum cannot come up: the gas path is not open, the hand valve or the solenoid valve is not closed, the vacuum pump motor belt is loose, and the vacuum gauge is damaged.
4. The main power switch trips: leakage of the input wires on the top of the heating box, leakage of the distribution box, external wires on the equipment, leakage of the motor, etc.
Fifth, the suction film is not in place: the vacuum is not enough, the air leakage, the temperature is not enough, the film is too thin, the workpiece is pasted with other materials, the concave depth of the workpiece exceeds the lift of the film, the suction time is too short, the film is not lifted, the distance between the workpiece Too close.
Sixth, the surface of the workpiece covered by the pre-coating film laminating machine is folded and not smooth or the corners cannot be wrapped: the film is not straightened, the film quality is not good, the workpiece is not polished well, the glue is sprayed too much, and the mold below the workpiece Too low.
7. Breaking phenomenon: the temperature is too high, the heating time is too long, the film quality is not good, and there is no heating.

In this process, the laminating equipment does not require a binder heating and drying system, which greatly simplifies the laminating procedure, and the operation is very convenient. It can be turned on whenever it is used, and the production flexibility is large. At the same time, there is no solvent odor, no environmental pollution, and more importantly, it can be completely Avoid bubbles, delamination and other failures, the transparency of its finished products is extremely high, with broad application prospects and promotion value. The pre-coated film structure is composed of a substrate and an adhesive layer. The substrate is usually PET and BOPP film. From the perspective of material cost and processing technology, most pre-coated film substrates use BOPP film with a thickness of 12-20 microns. The adhesive layer The thickness is 5-15 microns. According to different processing equipment and process conditions, different thicknesses of adhesive layer are selected. The adhesive layer is divided into hot melt adhesive and organic polymer low temperature resin. The difference between the two is that hot-melt adhesives are made by blending and modifying several materials of the main tackifier resin, tackifier and modifier, while the organic polymer resin is a single polymer low-temperature copolymer.
Due to technology, production equipment, and raw material restrictions, the pre-coated films (mostly hot-melt adhesives) produced by domestic equipment still have quality defects. Because there are production processes that rely on a process similar to that of coating the film, the colloid is dissolved with an organic solvent, and the roller is coated on the substrate film with a concave anilox roller, so there is insufficient solvent evaporation, and an odor occurs during operation. After coating, the solvent evaporates and the surface is prone to blistering. At the same time, because the hot-melt adhesive is blended with several kinds of polymer materials, during use, poor temperature control will cause degradation and cross-linking of the polymer in the hot-melt adhesive, resulting in poor coating surface. Some pre-coated film colloids are easy to adhere to the outer surface of the substrate, resulting in poor winding. Since the adhesive layer is thin and the surface is not activated, defects such as insufficient adhesion to the printed matter are likely to occur. Since the hot-melt adhesive is composed of several materials, the transparency after coating is significantly worse than the low-temperature pure resin pre-coating film.

Inspection work before the automatic laminating machine starts:
1. Detection before starting the automatic laminator ⑴ Confirm whether the machine is in a safe state.
2. Film transport adjustment to make the film tension even to adapt to the film transport tension.
3. Check whether the gap between the glue roller and the glue is parallel.
4. Check the temperature of the heating roller to avoid inaccurate thermometer.
5. The pressure that the pressure gauge must reach, otherwise the pressure will affect the product.
6. Clean the sundries on the rubber roller, so as not to cause waste in the finished product.
After completing the preparation work, close the main power switch, turn on the heating cylinder and the motor, then turn on the oil pump, adjust the flow rate of the laminating glue, and adjust the parallelism between the rollers. Adjust the measuring position of the paper on the feeding table, apply the film-coated glue, and turn on the drying tunnel for heating. After testing several sheets of film, adjust the heating temperature, pressure and air intake of the heating roller again until the effect is good, and then start normal work.