What are the factors that affect the transparency of composite membranes?

1. The adhesive is not properly selected.

The adhesive itself is dark in color; the adhesive has insufficient fluidity and poor flattening, and can not be fully spread on the base film.

2, the problem of the process.

a. The inlet temperature of the drying tunnel is too high or there is no temperature gradient. The inlet temperature is too high, and the drying is too fast, so that the solvent on the surface of the glue layer evaporates rapidly, the surface is crusted, and then when the heat penetrates into the inside of the glue layer, the film is under the film. The solvent vaporizes and breaks through the film to form a ring like a volcanic vent. The circle is also opaque.

b. The composite rubber roller or scraper is defective, and a certain point cannot be pressed, forming a neutral position and being opaque.

c. There is too much dust in the ambient air, and there is dust in the hot air blown into the drying tunnel after the glue is applied. Adhesive on the surface of the adhesive layer, sandwiched between the two base films during compounding, there are many small points, resulting in opacity.

d. The amount of glue is insufficient, there is a blank space, and there is a small air bubble, which causes spots or opacity. The amount of glue should be checked to make it sufficient and uniform.

e. No rubber roller or rubber roller is not clean.

3. Reasons for the substrate.

The surface tension is not high, the infiltration of the glue is not enough, and the film is uneven after drying, little by little, commonly known as "hemp face".