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 liquid packaging film will stick together.
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.
2. Improper proportion of ink causes stickiness. For special functions (heat-resistant, oil-resistant) inks, a hardener is added to the ink, and the hardener is a low-molecular substance and is inherently viscous. The heat resistance of the resin is poor. In the preparation of the gravure ink with synthetic resin, a resin having a high softening point around the world should be used. Generally, the softening point of the ring is from 105 ° C to 0 ° C, and the softening point of the resin is too low to be heat resistant.
3. The winding is too tight. During the printing process, the film should not be too tight or too long and too tight. As the printing machine keeps running, the winding volume is increasing, especially if a certain local cell is too deep, the area is too large, and the rib is easy to stick.
4. The ink and the substrate are not firmly bonded. Solving this problem can be tried in two ways. On the one hand, the ink is accurately selected, and the quality of the ink is controlled to adapt to the substrate. On the other hand, the surface of the substrate is treated to improve its affinity for the ink. It is best to use a single-sided treatment to prevent the double-sided tension from occurring. This is because the double-sided electrical treatment produces an anti-sticking effect on the adhesion of the adhered ink surface.
Understand the reasons that may cause the liquid packaging film to stick up, help remind workers to pay attention to the details of the liquid packaging film production, try to avoid such problems, improve the quality of liquid packaging film
Dongguan Bite Packaging Materials Co., Ltd. is a large-scale company specializing in the production of food-grade composite packaging. It is a professional composite packaging bag manufacturer that uses new equipment to produce packaging bags and film rolls to provide comprehensive, environmentally friendly and safe packaging services for the market. The company produces composite bags, film, fruit bags, aluminum foil bags, nozzle bags, stand-up bags, zipper bags, anti-static bags, shaped bags, etc., suitable for food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products, etc. Internal and external packaging for various industries. We adhere to the business philosophy of good faith cooperation, high quality and considerate service, and have been recognized by the industry. Our products are sold all over the world. Welcome friends from all walks of life to inquire, visit our factory for inspection and business negotiation.