Film is not bright, foaming reasons and maintenance
The film is a special transparent plastic film covered with the surface of the paper, and it is bonded together by the hot-press technology to protect the paper and increase the gloss of the paper. Cover can be divided into two kinds of matt and light: If you use transparent light film coating, the printed text of the film product is more vivid and full of three-dimensional, especially suitable for the packaging of green food and other products, can cause people's desire for consumption. If a matte film coating is used, the covered product will give consumers a noble and elegant feeling. Therefore, the matt film and the bright film have their advantages in application, and can improve the grade and added value of the product packaging.
1, inappropriate temperature control
When laminating, the temperature of the electrically heated steel drum must be adjusted according to the product covered and the film thickness. If the film substrate is gold paper, the pressure of the steel cylinder should be controlled at 70-80°C. If the gray paper is covered with 250g/m2 or 300g/m2, the temperature should be adjusted to 80-90°C. Whiteboard paper absorbs much more moisture than gold paper during placement. Especially on rainy days and in winter, if the temperature is not adjusted properly, the film products will not shine. During coating, it is sometimes found that there are noticeable droplets or vapors on the silicon-germanium roller. This is due to the fact that the paper absorbs a lot of moisture. The film temperature of such a product must be further increased. For a collection of products, drying temperature can be controlled at 50 ~ 60 °C. In order to glue the film in the drying channel with a finger to stick no trace of obvious marks, a little sticky. If the film temperature is too high, it will blistering. Therefore, the temperature of the heated steel drum must be controlled according to the characteristics of the product during lamination.
2, lack of pressure
According to the customer's needs, the thickness of the substrate material is often inconsistent. When laminating, the pressure between the silicone drum and the steel drum should be adjusted according to the thickness of the sheet. If the pressure is too small, the film of the film product is not firm, bright, and prone to wrinkles: if the pressure is too high, film wrinkles and paper deformation may occur.
3, the amount of rubber
When using stretched polypropylene film coating. Must be glued on the film. The amount of glue is controlled by a rotating steel roller installed in a plastic box and coated with glue on the moving film. The control of the amount of glue is controlled by a steel blade that falls on the steel roller. The pressure light glue is large: the pressure heavy glue amount is small. The amount of glue must be mastered, and it can be evenly covered without producing crystal spots. If the amount of glue is too large, the overlaid product will have no gloss.
During the gluing process, special attention should be paid to the fact that it is necessary to prevent the tiny particles and foreign substances from remaining in the rubber disc after the gel has solidified. If there is retention, it will be lifted by the rubber roller during rotation, and it will stick on the plastic blade. There will be a glueless white mark here. Therefore, after the laminator has been shut down for a long period of time, the laminating water or high-boiling point kerosene cleaning glue pump and the rubber container are used to ensure that the glue on the rubber roller is normally applied to the film without generating Traces.
4, keep the roller clean
After a long period of overpressure, the steel drum is in direct contact with the membrane, and with the effect of temperature, some residues remain on the steel drum. The contact between the silicone roller and the back side of the paper covered by the product, coupled with the separation of the paper feed distance, causes many glues to be hot pressed directly onto the glue roller and cause stacking, which will affect the brightness of the products covered. In severe cases, wrinkles may also occur on the covered products. Therefore, we must keep the drum clean, stop cleaning at any time to ensure the quality of the film product.
The film is a special transparent plastic film covered with the surface of the paper, and it is bonded together by the hot-press technology to protect the paper and increase the gloss of the paper. Cover can be divided into two kinds of matt and light: If you use transparent light film coating, the printed text of the film product is more vivid and full of three-dimensional, especially suitable for the packaging of green food and other products, can cause people's desire for consumption. If a matte film coating is used, the covered product will give consumers a noble and elegant feeling. Therefore, the matt film and the bright film have their advantages in application, and can improve the grade and added value of the product packaging.
1, inappropriate temperature control
When laminating, the temperature of the electrically heated steel drum must be adjusted according to the product covered and the film thickness. If the film substrate is gold paper, the pressure of the steel cylinder should be controlled at 70-80°C. If the gray paper is covered with 250g/m2 or 300g/m2, the temperature should be adjusted to 80-90°C. Whiteboard paper absorbs much more moisture than gold paper during placement. Especially on rainy days and in winter, if the temperature is not adjusted properly, the film products will not shine. During coating, it is sometimes found that there are noticeable droplets or vapors on the silicon-germanium roller. This is due to the fact that the paper absorbs a lot of moisture. The film temperature of such a product must be further increased. For a collection of products, drying temperature can be controlled at 50 ~ 60 °C. In order to glue the film in the drying channel with a finger to stick no trace of obvious marks, a little sticky. If the film temperature is too high, it will blistering. Therefore, the temperature of the heated steel drum must be controlled according to the characteristics of the product during lamination.
2, lack of pressure
According to the customer's needs, the thickness of the substrate material is often inconsistent. When laminating, the pressure between the silicone drum and the steel drum should be adjusted according to the thickness of the sheet. If the pressure is too small, the film of the film product is not firm, bright, and prone to wrinkles: if the pressure is too high, film wrinkles and paper deformation may occur.
3, the amount of rubber
When using stretched polypropylene film coating. Must be glued on the film. The amount of glue is controlled by a rotating steel roller installed in a plastic box and coated with glue on the moving film. The control of the amount of glue is controlled by a steel blade that falls on the steel roller. The pressure light glue is large: the pressure heavy glue amount is small. The amount of glue must be mastered, and it can be evenly covered without producing crystal spots. If the amount of glue is too large, the overlaid product will have no gloss.
During the gluing process, special attention should be paid to the fact that it is necessary to prevent the tiny particles and foreign substances from remaining in the rubber disc after the gel has solidified. If there is retention, it will be lifted by the rubber roller during rotation, and it will stick on the plastic blade. There will be a glueless white mark here. Therefore, after the laminator has been shut down for a long period of time, the laminating water or high-boiling point kerosene cleaning glue pump and the rubber container are used to ensure that the glue on the rubber roller is normally applied to the film without generating Traces.
4, keep the roller clean
After a long period of overpressure, the steel drum is in direct contact with the membrane, and with the effect of temperature, some residues remain on the steel drum. The contact between the silicone roller and the back side of the paper covered by the product, coupled with the separation of the paper feed distance, causes many glues to be hot pressed directly onto the glue roller and cause stacking, which will affect the brightness of the products covered. In severe cases, wrinkles may also occur on the covered products. Therefore, we must keep the drum clean, stop cleaning at any time to ensure the quality of the film product.
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