Composite film manufacturer there are bubbles and spots in the composite film, what is the cause?

There are many factors in this kind of situation, and the actual situation needs to be analyzed in detail. The basic elements commonly used to produce bubbles and spots are:

1, environmental factors such as dust and suspended matter interference, which requires a good environmental health area environment); If there is a suspended substance in other adhesives, it is necessary to identify whether it is carried by the adhesive itself or with a plastic bucket;

2.The equipped adhesive is doped with water, which is not dried at the ambient temperature of 60 ~ 90 degrees in the drying channel, and reacts with the curing agent to produce CO2 bubble and white crystal point after chemical crosslinking, and there are two kinds of gas bubble and water vapor bubble in the composite film;

3.the ambient humidity in the working area environment is too large, the water in the air adheres to the plastic surface, especially the plastic surface with large hygroscopicity, such as nylon, cellophane and other easy crystal points;

4.When the adhesive is equipped, the concentration is too thin, the amount of glue is short, the amount of glue is short, the mesh roll is blocked, and other factors are composed of regular spots or bubbles.

5.the film quality is poor, that is, the surface tension of the base film is too poor, the composition of the adhesive is poor, and there is no glue where the bubble is generated;

6.During the coating, the Angle of the scraper and the fluctuation of the adhesive are relatively large, and the impact of the bubble is generated. When the composite machine is working quickly, the bubble can not be immediately subsided, resulting in a lot of bubbles in the rubber tray, which are then engrafted and transferred to the film (the viscosity of the adhesive is too high, and the bubble will be generated);

7.The coating pressure is short, the outer temperature of the coating roller is too low, the adhesive activation is short, and the circulation is small, so that the open space between the adhesive dot and the dot can not be filled, and there is a thin open space to form a bubble;

8.Adhesive product quality problem

9.The interference of water and alcohol in the coating glue manufacturer,should be avoided as much as possible during coating

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