Why insufficient transparency of stretch winding film
July 04, 2019
We often look at the logistics company's use of stretch-wound film, stretch-wrap film by means of the film's superior winding force and retractability, the product is compactly and fixedly bundled into a unit, even in the unfavorable environment, the product does not have any Loose and separate, with no sharp edges and stickiness to avoid damage.
1. The rubber roller or scraper is defective, and a certain point cannot be pressed, forming a neutral position and being opaque.
2. 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. One turn and one turn makes the wound film opaque.
3. There is too much dust in the air of the manufacturer's environment. 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, with many small dots, resulting in opacity.
4. No rubber roller or rubber roller is not clean.
5. The amount of glue on the stretch wrapping film is insufficient, there is a blank space, and there is a small air bubble, which causes the spot or opacity. The amount of glue should be checked to make it sufficient and uniform.
