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.

At present, there are many types of laminating machines on the market, but in general, there are two main types of laminating machines: two types of coating laminating machines and pre-coating laminating machines. Instant coating laminating machine includes three parts: gluing, drying and hot pressing. It has a wide range of application and stable and reliable processing performance. It is currently widely used in China. Pre-coated laminating machine, no gluing and drying parts, small size, low cost, flexible and convenient operation, not only suitable for laminating processing of large batches of printed products, but also suitable for laminating small batches and scattered printed products such as automated desktop office systems Processing is very promising.
The pre-coating film laminating machine mainly has the following advantages: simple and easy to use, saving operation time. No foam, no wrinkles or delamination. After coating, the effect is brighter than traditional cold glue coating (oily, water-based), and the product can be stored for a long time without turning yellow. No solvent pollution makes the factory safer and environmentally friendly, and the workers are healthier. It meets the environmental protection requirements of European and American countries and has been widely used by European and American manufacturers.
How to choose a suitable pre-coating film laminating machine is, of course, to choose the latest pre-coating film laminating machine that is both good in operation, energy-saving and long-life, and has the following advantages: it can make the pre-coating film laminating The machine cost can be saved by about 45%; the pre-coating film laminator can be saved by about 50%; the self-adhesive laser film can be saved by about 60%; synthetic paper, PVC, PET, PP rolls can be Tubes and other materials are perfectly covered.

The amount of film used by the hot laminator during lamination is mainly related to the operation level. It is recommended to:
1. The product to be constructed must be straight. Handle uneven paper with "ruffled edge" and "tight edge" phenomena. Paper with "lotus edge" can be baked, and paper with "tight edge" can be hung to dry.
2. Be sure to wait for the blot to dry before coating, otherwise it will cause blistering or hair pulling.
3. Spray as little powder as possible during printing, otherwise it will cause emptying and bubbling at the powder pile. Before spraying the film, the powder should be disposed of. If the number of prints is large, the powder can be hung to remove the powder. If the number of prints is small, the powder can be wiped manually.
4. Pay attention to the direction of the paper strands, especially thick paper, to reduce the curling of the paper due to rolling and stretching.
There is also: the temperature is generally controlled to 40 ~ 60 ℃. Too high a temperature will deform the paper and film, causing the product to curl, but not too low, otherwise it will cause insufficient viscosity. The temperature of coated paper should be slightly lower than that of offset paper.

The operation of the pre-coating laminating machine includes three parts: gluing, drying, and hot pressing. The operation is relatively high. The advantage is that the quality of the finished product is reliable. The fatal disadvantage of the oil-based glue is that it produces gases that affect human health. This technology has been completely banned in developed countries such as Europe and the United States. Water-based adhesives are more environmentally friendly than oily ones, and their relative oily costs are higher.
The three major structures of the laminating machine are introduced as follows:
1. Automatic input of printed matter
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. Hot-pressing compound mechanism of pre-coating laminating machine
The hot pressing compound mechanism includes a compound roller group and a calender roller group. The compound roller group is composed of heating pressure roller and silicone pressure roller. The hot pressure roller is a hollow roller, which is equipped with a heating device inside, and the surface is forged with hard chrome, and is polished and refined. The temperature of the hot roller is tracked by the sensor and corrected by the computer at any time. The compound pressure is adjusted by an eccentric cam mechanism. Stepless adjustment. 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 without a 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 of pre-coating laminating machine
The transmission system of the pre-coating film laminating machine is driven by a high-power motor controlled by a computer. After being decelerated by a first gear, 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.