Analyze the reason why the drug packaging film is not bright
2021-07-25 04:11:17
A part of the color packaging film coating method is to use a biaxially oriented polypropylene film, and the coated product may be non-lighting or foaming. The author has studied and analyzed this issue and summarized the following points.
1 temperature control is not suitable
When laminating different substrates, the temperature of the electrically heated steel drum must be adjusted according to the covered product. If the film substrate is gold card paper, the temperature of the covered steel drum should be controlled at 70 ° C ~ 80 ° C: If it is coated with 250g / m2 or 300g / m2 gray white paper, the temperature should be adjusted to 80 ° C ~ 90 ° C. When the whiteboard paper is placed, it absorbs far more water than the gold cardboard. Especially in rainy and winter days, if the temperature is not adjusted properly, the film product will not be bright. When the film is covered, it is sometimes found that there is obvious water droplets or steam on the silicon crucible cylinder, which is caused by the paper absorbing a large amount of water. The film temperature of such products must be increased. For a product, the temperature of the drying tunnel can be controlled at 50 ° C ~ 60 ° C. The film coated with the glue at the exit of the drying tunnel with the fingers to test the flaws, a little sticky. If the film is too warm, it will foam. Therefore, it is necessary to control the temperature of the heated steel drum according to the characteristics of the product when coating.
2 insufficient pressure
According to the customer's needs, the thickness of the substrate material is inconsistent. The pressure between the silicone roller and the steel roller should be adjusted according to the thickness of the substrate paper during lamination. If the pressure is too small, the film of the film product is not strong, not bright, and wrinkles are easily generated: the pressure is too large, and wrinkles and paper deformation may occur.
3 glue output
When using a stretched polypropylene film. The film must be applied to the film. The amount of glue applied is transferred to the moving film by a rotating steel roller installed in the plastic box. The control of the amount of glue is controlled by a steel blade falling on the steel roller. The pressure is light and the amount of glue is small: the pressure and the amount of glue are small. The amount of glue should be mastered, and it can be evenly covered and cannot produce crystal points. If the amount of glue is too large, the product that is covered will also be dull.
Special attention should be paid during the sizing process. It is necessary to prevent the tiny particles and foreign matter after the gel is solidified from remaining in the rubber disk. If it is retained, it will be picked up by the rubberizing roller during the rotation, and it will be stuck on the rubber blade. Here, a glueless white mark will appear. Therefore, after the laminator is shut down for a long time, the glue pump or the high-boiling kerosene should be used to clean the glue pump and the rubber bucket before the film is turned on to ensure that the glue of the rubber roller is normally applied to the film without generating Traces.
4 keep the drum clean
After a long period of overpressure, the steel drum is in direct contact with the membrane, and with the effect of temperature, some residue remains on the steel drum. The silicone roller directly contacts the back side of the coated product paper, and the separation of the paper feed distance, a lot of glue is directly pressed onto the rubber cylinder to cause accumulation, which will affect the brightness of the covered product.
In severe cases, the coated product will wrinkle. Therefore, it is necessary to keep the drum clean and stop it at any time to ensure the quality of the film.
1 temperature control is not suitable
When laminating different substrates, the temperature of the electrically heated steel drum must be adjusted according to the covered product. If the film substrate is gold card paper, the temperature of the covered steel drum should be controlled at 70 ° C ~ 80 ° C: If it is coated with 250g / m2 or 300g / m2 gray white paper, the temperature should be adjusted to 80 ° C ~ 90 ° C. When the whiteboard paper is placed, it absorbs far more water than the gold cardboard. Especially in rainy and winter days, if the temperature is not adjusted properly, the film product will not be bright. When the film is covered, it is sometimes found that there is obvious water droplets or steam on the silicon crucible cylinder, which is caused by the paper absorbing a large amount of water. The film temperature of such products must be increased. For a product, the temperature of the drying tunnel can be controlled at 50 ° C ~ 60 ° C. The film coated with the glue at the exit of the drying tunnel with the fingers to test the flaws, a little sticky. If the film is too warm, it will foam. Therefore, it is necessary to control the temperature of the heated steel drum according to the characteristics of the product when coating.
2 insufficient pressure
According to the customer's needs, the thickness of the substrate material is inconsistent. The pressure between the silicone roller and the steel roller should be adjusted according to the thickness of the substrate paper during lamination. If the pressure is too small, the film of the film product is not strong, not bright, and wrinkles are easily generated: the pressure is too large, and wrinkles and paper deformation may occur.
3 glue output
When using a stretched polypropylene film. The film must be applied to the film. The amount of glue applied is transferred to the moving film by a rotating steel roller installed in the plastic box. The control of the amount of glue is controlled by a steel blade falling on the steel roller. The pressure is light and the amount of glue is small: the pressure and the amount of glue are small. The amount of glue should be mastered, and it can be evenly covered and cannot produce crystal points. If the amount of glue is too large, the product that is covered will also be dull.
Special attention should be paid during the sizing process. It is necessary to prevent the tiny particles and foreign matter after the gel is solidified from remaining in the rubber disk. If it is retained, it will be picked up by the rubberizing roller during the rotation, and it will be stuck on the rubber blade. Here, a glueless white mark will appear. Therefore, after the laminator is shut down for a long time, the glue pump or the high-boiling kerosene should be used to clean the glue pump and the rubber bucket before the film is turned on to ensure that the glue of the rubber roller is normally applied to the film without generating Traces.
4 keep the drum clean
After a long period of overpressure, the steel drum is in direct contact with the membrane, and with the effect of temperature, some residue remains on the steel drum. The silicone roller directly contacts the back side of the coated product paper, and the separation of the paper feed distance, a lot of glue is directly pressed onto the rubber cylinder to cause accumulation, which will affect the brightness of the covered product.
In severe cases, the coated product will wrinkle. Therefore, it is necessary to keep the drum clean and stop it at any time to ensure the quality of the film.
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