The transparency of stretch wrap film mainly refers to the requirement in the quality indicators of plastic products such as seedling film, food packaging film, beverage bottles, and lamps. Transparency is mainly characterized by the transmittance and haze of the product. Products with good transparency should have high transmittance and low haze, but sometimes they may appear opaque during the production process. So, what is the reason for the insufficient transparency of stretch wrap film? Next, the winding film manufacturer will provide us with a detailed introduction:

1. The temperature at the entrance of the drying oven is too high or there is no temperature gradient. If the temperature at the entrance is too high and the drying is too fast, the solvent on the surface of the adhesive layer will quickly evaporate, and the surface will crust. Then, when the heat penetrates into the interior of the adhesive layer, the solvent under the film will vaporize, breaking through the adhesive film and forming a circular structure like a volcanic vent, which will also make the wrapped film opaque.

2. There is a defect in the rubber roller or scraper, which cannot be pressed at a certain point, forming a neutral gear and opaque.
3. There is too much dust in the ambient air of the wrapping film manufacturer, and there is dust in the hot air blown into the drying channel after gluing. Adhesive on the surface of the adhesive layer, sandwiched between the centers of two base films during composite, with many small dots, forming an opacity.
4. The amount of glue applied to the winding film is insufficient, with gaps and small air bubbles, forming spots or opacity. The amount of glue applied should be checked to ensure that it meets and is uniform.

5. No spreading roller or unclean spreading roller.

Article source: Heshan stretch film http://www.hshongli.com/