Part of the color packaging film method is to use biaxially oriented polypropylene film, the product after the film will appear dull or blistering. The author conducted research and analysis on this issue and summarized the following points.
1. Unsuitable temperature control
When laminating different substrates, the temperature of the electrically heated steel drum must be adjusted according to the coated product. If the coated substrate is gold cardboard, the temperature of the laminated steel cylinder should be controlled at 70℃～80℃: if it is coated with 250g/m2 or 300g/m2 gray whiteboard paper, the temperature should be adjusted to 80℃～90℃. During the placement of whiteboard paper, the moisture absorbed by it far exceeds that of gold cardboard. Especially in rainy days and winters, if the temperature is not adjusted properly, the film-covered products will not shine. When laminating, sometimes there are obvious water droplets or steam on the silicon roller, which is caused by the paper absorbing a lot of moisture. The film laminating temperature of such products must be raised a little bit more. For the product received, the drying tunnel temperature can be controlled at 50 ℃ ~ 60 ℃. Use the glued film to stick the finger at the exit of the drying tunnel and test it without traces, just a little sticky. If the film temperature is too high, it will foam. Therefore, the temperature of the heating steel drum must be controlled according to the characteristics of the product when laminating.
2. Keep the roller clean
After a long period of pressure, the steel drum is in direct contact with the membrane. With the effect of temperature, some residues will be left on the steel drum. The silicone roller is in direct contact with the back of the coated product paper, plus the separation of the paper spacing, many glues are directly pressed onto the rubber roller to cause accumulation, which will affect the brightness of the coated product. In severe cases, the covered product may wrinkle. Therefore, the drum must be kept clean and shut down at any time to ensure the quality of the film-covered product.
3. Insufficient pressure
According to customer needs, the thickness of the substrate material is mostly inconsistent. When laminating, the pressure between the silicone roller and the steel roller should be adjusted according to the thickness of the substrate paper. If the pressure is too low, the film of the film-covered product is not strong, bright, and wrinkle-prone: too much pressure will cause film wrinkle and paper deformation.
4. The amount of glue
When using stretched polypropylene film. The film must be glued. The amount of glue is applied to a moving film by a transmission steel roller installed in a plastic box through a rotating belt. The amount of glue is controlled by a steel blade that falls on the steel roller. Large amount of pressure light glue: small amount of pressure heavy glue. The amount of glue should be well controlled, so that it can be covered evenly, and no crystal points can be generated. If the amount of glue is too large, the covered product will be dull.
Special attention should be paid to the process of gluing, it is necessary to prevent the tiny particles and foreign objects after the gel is solidified from remaining in the rubber tray. If left, it will be picked up by the rubber roller during rotation and stuck on the rubber blade, and there will be a rubber-free white mark here. Therefore, after the laminator is shut down for a long time, before the laminator is turned on, the glue pump and the hopper box should be cleaned with laminating water or high-boiling kerosene to ensure that the glue of the upper roller is normally coated on the film without being produced. Trace.

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 printing input, hot-pressing zone 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. The automatic conveying mechanism of the printed matter input part can ensure that the printed matter does not overlap during the transmission and enter the composite part at an equal distance. It is generally controlled by pneumatic or friction methods. The conveyance is accurate and high precision. It can also be used when the printed product with a small composite format is small Meet the above requirements.
2. Computer control system The computer control system uses a microprocessor. 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.
3. The composite part includes a composite 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 pressure 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.
4. Transmission system The transmission system is driven by a computer-controlled high-power 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 composite part and the silicone pressure roller of the calendering mechanism. The pressure roller group maintains a suitable working pressure under the action of steplessly adjusted pressure.

The pre-coating laminating machine consists of four main parts: pre-coating plastic film unwinding, automatic printing input, hot-pressing zone 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. The automatic conveying mechanism of the printed product input part of the pre-coated laminating machine can ensure that the printed products do not overlap during the transmission and enter the composite part at an equal distance. The pneumatic or friction method is generally used to achieve control. The conveyance is accurate, the precision is high, and the composite size is small. The printed matter can also meet the above requirements.
2. The computer control system of the pre-coating laminator adopts 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 driver board.
3. The composite part of the pre-coating laminator includes a composite 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 pressure 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.
4. The transmission system of the pre-coating laminating machine is driven by a high-power motor controlled by a computer. After one-stage gear reduction, it is driven by a three-stage chain to drive the movement of the paper feeding mechanism and the composite part and the silicone of the calendering mechanism. The rotation of the pressure roller. The pressure roller group maintains a suitable working pressure under the action of steplessly adjusted pressure.

1. The machine of the automatic laminating machine does not start: the input wire is disconnected, the power cord is reversed, and the voltage is not enough.
2. When the film is not sucked up, the film is pulled down: whether the solenoid valve or hand valve is open.
3. Inaccurate temperature measurement: thermocouple, temperature controller. Whether the installation is incorrect and damaged.
4. Breaking phenomenon: the temperature is too high, the heating time is too long, the film quality is not good, and there is no heating.
Fifth, the main power switch trips: the leakage of the input wires on the top of the heating box, the leakage of the distribution box, the external wires are laid on the equipment, and the leakage of the motor.
Sixth, the working vacuum is not 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.
Seven, the 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 film lift, the automatic laminating machine suction time is too short, the film is not Pull up, the workpiece is too close.
8. The surface of the overlaid workpiece has folds and is not smooth or the corners cannot be wrapped: the film is not straightened, the quality of the film is not good, the workpiece is not well polished, the glue is sprayed too much, and the mold below the workpiece is too low.

The heated rubber roller receives the heated melted glue on the laminated film, and then applies it to paper or cards with the rubber roller. The use of rollers means that the adhesive can be diffused more evenly, eliminating the damage of air bubbles on the laminate. Laminating machine rolls can be used for large-size lamination, often used in the printing industry to laminate posters, magazines, postcards, and booklets. This example laminating machine is also widely used in homes, offices and schools. If the content of the film is easily damaged by heat, cold-rolled rubber rollers can be accepted.
In order to obtain aspiring laminating results, not only adhesives, plastic films and printed products are required to have excellent adhesive compliance, but also a compliant laminating equipment deployment. Laminating equipment deployment can be divided into two major categories, namely coating film machine and pre-coating film machine. That is, the coating film machine has a wide practical range and stable and reliable processing performance. It is now widely used in the deployment of coating equipment in China. Pre-coating film machine, no gluing and drying department, small size, low cost, convenient operation and maneuvering, not only practical laminating processing of large batches of printed products, but also practical and automatic desktop office system and other small batch, sporadic printed film laminating processing .