Trademark die cutting machine coated foam four reasons, trademark printing press to answer for you

Part of the trademark die cutting machine color packaging is the use of bidirectional tensile polypropylene film, laminating products will appear black or foaming phenomenon. The main reasons are as follows:

1. If the temperature control is not fitted to different substrates, the temperature of the electric heating steel roll should be adjusted according to the products to be covered. If the coated substrate is gold card paper, the temperature of the steel roller should be controlled at 7080: if it is covered with 250g/㎡ or 300g/㎡ gray white paper, the temperature should be adjusted to 80/90. In the process of laying blackboard paper, it absorbs much more water than gold card paper. Especially in rainy days and winter, coated products will not glow if the temperature is not properly regulated. Covering film sometimes found that there are water droplets or steam on the silicone roller, this is because the paper absorbs a lot of water. The film temperature of such products increases. For one product, the drying temperature can be controlled at 5060. Glue film at the exit of the drying road with fingers, will not leave traces, just a little sticky. If the temperature of the film is too high, it will bubble. Therefore, the temperature of the heating steel roller should be controlled according to the characteristics of the product when plasticizing.

2, insufficient pressure According to customer needs, the thickness of the substrate material is often inconsistent. When laminating, the pressure between the silicone roller and the steel roller should be adjusted according to the thickness of the paper substrate. The pressure is too small, the film layer of coated products is weak, no luster, easy to wrinkle: the pressure is too large, will cause the film layer wrinkle, paper deformation.

3. Paste the water outlet when using the stretched polypropylene film. The glue should be applied to the film. The amount of glue is applied to the moving film by rotating the tape through the driving steel roller installed in the rubber box. The amount of glue applied is controlled by a blade falling on the steel roll. Light pressure glue large: pressure glue small. The amount of glue should be controlled so that it can be applied firmly and evenly without creating crystal heads. If the amount of glue is too large, the cover will not shine. In the process of gluing, special attention should be paid to avoid small particles and foreign bodies after glue solidification in the glue tray. If there is any residue, it will be picked up by the rubber roller in the rotation process, stuck in the rubber plate, there will be a white print without glue. Therefore, after the laminating machine is shut down for a long time, before opening the laminating machine, the glue pump and the glue bucket should be cleaned with laminating water or high boiling point kerosene first, to ensure that the glue flowing from the rubber roller is usually applied to the unproduced film. Mark Road.

4, keep the roller clean for a long time after pressure, steel roll and film direct contact, due to the influence of temperature, steel roll will remain some residue. The silicone roller is in direct contact with the back of the coated product paper. With the separation of the feeding distance, a large amount of glue is directly pressed on the cots and accumulated, which will affect the gloss of the product. Coating products. In severe cases, the covered product may appear wrinkled. Therefore, keep the roller clean, closed and cleaned at all times to ensure the quality of coating products.