Flexible packaging polyurethane laminating adhesives are the core materials for the production of food and daily necessities flexible packaging lamination. The adhesive's bonding stability directly determines the quality of the packaged products. Many people only focus on the application process but overlook the storage stage. In fact, proper storage conditions are the key to ensuring the performance of the adhesives and avoiding production losses. Their importance cannot be ignored.
The chemical properties of polyurethane laminating adhesives are extremely unique. The isocyanate component in the mixture is highly prone to react with moisture in the air. If the storage environment is humid and the sealing is not tight, the adhesive will prematurely harden, form a crust, and thicken. This not only leads to reduced fluidity and uneven application but also significantly reduces the bonding strength, causing problems such as delamination, peeling, and blistering in flexible packaging, and directly increasing the product's scrap rate.
Environmental temperature and light exposure are also crucial influencing factors. Research shows that for every 10℃ increase in storage temperature, the deterioration rate of the adhesive doubles. Exposure to high temperatures and storage environments with heat sources close by will accelerate the aging of the glue, cause component failure, and shorten the shelf life; while excessively low temperatures will cause the glue to crystallize and have abnormal viscosity, affecting normal use. At the same time, acidic and alkaline gases, as well as dust pollution, will disrupt the chemical balance of the glue, leading to performance degradation.
In addition, standardized storage can also avoid safety risks. Polyurethane laminating adhesives often contain solvents. A storage environment that is cool, well-ventilated, and away from fire sources can effectively prevent safety hazards caused by the accumulation of volatile gases. In conclusion, controlling storage conditions such as sealing, temperature and humidity, and avoiding light and ventilation is the foundation for stabilizing production quality, controlling costs, and ensuring safe production.
