What Is The Cause Of Food Liquid Packaging Film Adhesion？

The liquid packaging film is creased, which is a common problem in the process of repairing and using the liquid packaging film. It is usually caused by the incomplete processing of the details in the production process, and the possibility of the problem is greater in the ink. The package analyzes why the liquid packaging film will stick together.

After the plastic film is wound up through the gravure, the packaged bag is formed by splitting and slitting, and the ink or ink between the printing surfaces is adhered to the printed vacant surface, and cannot be separated (the ink is peeled off when the force is pulled, and the product is scrapped) . It should be analyzed from the reasons that may lead to adhesion, that is, the ink is sticky, the humidity is too high, and the pressure is too high.

1. Intrinsic factors causing adhesion: The ink itself has poor heat resistance and has a certain viscosity. When a large amount of solvent remains in the printed ink, it seems that the paint is not dry - although it seems to be dry to the naked eye, it is actually dry and sticky. After the printed matter is rolled up, the residual solvent is difficult to evaporate, and the resin in the ink cannot be dried and solidified, causing severe adhesion of the finished product. Adhesive products, if determined by gas chromatography, the residual solvent content often reaches tens of thousands of PPM, and the residual solvent will make the product contain odor. This not only affects the strength of the composite, but also affects the flavor and hygiene of the food. Start with the function of the dryer, the drying premise, and the load. Secondly, use a fast-drying flux as much as possible. Finally, the printing material should be stored in a moisture-proof manner. This is to prevent the moisture in the material from swelling the resin in the ink and causing stickiness.