What is the cause of bubbles and spots in the composite film?

  There are many reasons for this kind of imagination, and specific situations need to be analyzed in detail. Common factors that produce bubbles and spots include：

  A: The impact of environmental factors such as dust and impurities. This requires a good hygiene environment. In addition, if there are impurities in the adhesive solution, it is necessary to determine whether it is brought in by the adhesive itself or the mixing bucket;

  B: The configured glue is mixed with water, which is not dried at the temperature of 60 degrees to 90 degrees in the drying channel, and reflects with the curing agent to produce carbon dioxide bubbles and produce white crystal points after crosslinking, while the composite film also contains two kinds of air bubbles;

  C: The humidity in the working environment is too large, and the water in the air is attached to the plastic surface, especially the plastic surface with large hygroscopicity such as nylon, cellophane and other easy crystal points;

  D: When the adhesive is configured, the concentration is too thin, resulting in insufficient amount of glue, the selection of the mesh roll is shallow, resulting in insufficient amount of glue, and the mesh roll is blocked, resulting in regular points or bubbles;

  E: The quality of the film is poor, that is, the surface tension of the base film is too poor, resulting in poor leveling of the adhesive and bubbles in the place without glue;

  F: When compounding, the Angle of the scraper and the drop of the rubber liquid are large, the impact will produce bubbles. When the compounding machine is running at high speed, the bubbles can not be dissipated in time, resulting in a large number of bubbles in the rubber tray, which are then engrafted and transferred to the film (the viscosity of the adhesive is too high, and bubbles will also be produced);

  G: The compound pressure is insufficient, the surface temperature of the compound roll is too low, the adhesive activation is insufficient, and the fluidity is small, so that the gap between the glue and the dot can not be filled, resulting in a small gap, resulting in bubbles;

  H: Adhesive quality problem.