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. Temperature control is not suitable
When the roll-to-roll laminator coats different substrates, the temperature of the electrically heated steel drum must be adjusted according to the product being coated. 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 it absorbs far exceeds that of gold cardboard.
Especially in rainy days and winter, if the temperature is not adjusted properly, the film-covered product 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 a 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. 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 easy to produce wrinkles: too much pressure will cause film wrinkles and paper deformation.
3. 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 rubber box through a rotating belt. The amount of glue is controlled by a steel blade that falls on the steel roller. Large amount of light pressure glue: small amount of pressure heavy glue. The amount of glue should be mastered, so that it can be covered evenly, and no crystal points can be produced. 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 solidifies from remaining in the rubber tray. If it is 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 a long shutdown of the laminating machine, before the laminating machine is started, the laminating pump and the hopper box should be cleaned with laminating water or high boiling point kerosene to ensure that the glue of the upper roller is normally coated on the film and does not produce. Trace.
4. Keep the roller clean
After a long time of pressing, 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 distance, 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.

The laminating machine manufacturer explained that the pre-coating type laminating machine is a special equipment for compounding printed matter with pre-coated plastic. 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. 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. The composite part includes a composite roller group and a calender roller group. The composite roller group is composed of silicon rubber heating pressure roller 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 The transmission system 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 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. The hardware configuration consists of a main board, digital key board, optical isolation board, power board, stepper motor power driver board, etc.

Familiar with the preparation operation before the automatic laminating machine is started
The laminating process of the automatic laminating machine refers to the whole process of laminating pictures and photos, including film selection, film making, and cutting. Mainly used for post-production of advertising pictures and wedding photos. The pictures covered with film have high anti-corrosion, waterproof, dustproof, anti-wrinkle and anti-ultraviolet erosion performance, which can produce strong three-dimensional sense and artistic appeal. So what should we do before the lamination process?
Inspection work before laminating machine:
1. Detection before laminating machine 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.
Fully automatic laminating is to apply plastic adhesive to the plastic film and print it with paper as the substrate, press it together with the rubber roller and the heating roller to form a product of paper and plastic. Can be divided into mica tape coating, paper coating, advertising consumables coating, aluminum foil coating, suitable for: paper, film, PE, PVC and other roll composite. The fully automatic laminating machine is customized for the world's largest film manufacturer, which realizes automatic film sticking and protects the lens to prevent subsequent processes from scratching the lens.
Description of mirror automatic laminating machine equipment:
1. Fully automatic film sticking, no manual intervention, close mounting, no bubbles.
2. According to the size and thickness of the product, the equipment can set the blade type to achieve precise cutting.
3. Intelligent tool change function (according to the scanned product barcode, automatically identify the blade type).
4. The equipment has a wide range of applications, such as mobile phone back cover, LCD/LED, etc.

Laminating machine manufacturers analyze the rapid elimination of laminating machines:
1. The machine does not start: the input wire is disconnected, the power cord is reversed, and the voltage is insufficient.
2. Inaccurate temperature measurement: thermocouple, temperature controller. Whether the installation is incorrect and damaged.
3. The working vacuum does not come up: the gas path is blocked, 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 wire on the top of the heating box, leakage of the distribution box, external wires on the equipment, leakage of the motor, etc.
Fifth, the laminating machine manufacturer explained that 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 pull of the film, the suction time is too short, the film is not Pull up, the workpiece is too close.
Sixth, the surface of the overlaid workpiece is folded and 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. 7. The film is pulled down when the suction is not reached: whether the solenoid valve or hand valve is open.
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.
8. Laminating machine manufacturers explain that the laminating machine has a bad sticking situation
1. Improper selection of adhesive, improper setting of glue amount, incorrect proportioning measurement. Should re-select the type and amount of adhesive.
2. The diluent contains alcohol and water that consume NCO groups, so that the hydroxyl group of the main agent does not react. High-purity ethyl acetate should be used.
3. There is powder spraying on the surface of the printed matter. Wipe gently with a dry cloth.
4. The ink layer of the printed matter is too thick. Adhesive coating arrangement should be increased to increase pressure
5. The ink layer of the printed matter is not dry or completely dried. It should be hot pressed once before gluing; choose an adhesive with high solid content; increase the thickness of the adhesive coating; increase the temperature of the drying tunnel, etc.
6. The adhesive is absorbed by the printing ink and paper, which makes the coating amount insufficient. Should re-formulate and set the coating amount.
7. The surface treatment of plastic film is not enough or exceeds the applicable period, which makes the treatment surface invalid. The plastic film should be replaced.
8. The pressure is low, the speed is fast, and the temperature is low. The temperature and pressure of the film should be increased, and the vehicle speed should be appropriately reduced.
9. Foaming
1. The printing ink layer is not dry. It should be hot pressed again and then glued; postpone the coating time and let it dry completely.
2. The printing ink layer is too thick. Should increase the amount of adhesive coating, increase pressure and compound temperature.
3. The drying temperature is too high, and the surface of the adhesive skins. The drying temperature should be reduced
4. The surface temperature of the composite roller is too high. The temperature of the composite roller should be reduced.
5. The film is wrinkled or loose, and the film is uneven or curled. The film should be replaced and the tension adjusted.
6. There are dust impurities on the surface of the film. It should be cleared in time.
7. Uneven coating of adhesive and low dosage. The coating amount and uniformity should be improved.
8. The adhesive concentration is too high, the viscosity is large, and the coating is uneven. Use thinner to reduce adhesive concentration.
Ten. Wrinkle treatment of laminating machine manufacturers
1. The film transfer roller is unbalanced. The transfer stick should be adjusted.
2. The ends of the film are inconsistent or wavy. Qualified film should be replaced.
3. The adhesive layer is too thick, the solvent is not evaporated completely, which affects the viscosity. When pressed by the pressure roller, there is a slip between the paper and the film. The amount of glue should be adjusted to increase the temperature of the drying tunnel.
4. Both ends of the electric heating roller and the rubber roller are unbalanced, the pressure is inconsistent, and the linear speed is not equal. Two rollers should be adjusted.

Precautions for use of roll-to-roll laminator
1. Install the cold laminator on a special support and place it on a stable and firm workbench. Then make a special platform for laminating film, the height is 5 mm lower than the edge height of the laminating machine, the width is 1600 mm, and the length is more than 1 meter.
2. Place the material to be mounted on the film or the empty cold laminator on the iron roller in front of the cold film machine. After entering the cold laminator, the coating surface is facing upward.
3. Adjust the pressure regulating handwheel on the cold laminator, lift the upper rubber roller, and then pass the material out of the two rubber rollers by 10 cm.
4. If laminating film is needed, the cold laminating film must be put out of the two rubber rollers of the cold laminating machine by 10 cm and placed on the consumables. The film and the consumables must be aligned on both sides.
5. Adjust the position of the consumables on the platform so that the tightness of the two sides of the cold laminator is basically the same, then adjust the pressure hand wheel on the machine, put the top roller down, and adjust it to the empty position. The pressure on both ends must be the same.
6. If the laminating machine is empty, you can shake the handwheel to move the consumables forward. It must be even when shaking, moving at the same speed, not fast or slow. If there is no wrinkle after 5 meters, it means there is no quality problem of consumables.
7. If laminating film is required, first fold the cold laminating film release paper inward to expose the glue surface on the PVC film, then shake the handwheel in the opposite direction, first stick the adhesive surface to the consumables, and then apply the cold laminating film Turn the whole back of the rubber roller, and slowly release the cold laminating film from the fold. At this time, turn the rubber roller to rotate it forward. With the rotation of the rubber roller, slowly remove the release paper and keep the tightness of both sides consistent. With a certain intensity until the end of cold mounting.