Before using the polyurethane laminating adhesive, it is necessary to conduct a preliminary test.
2026,06,10
Before using the flexible packaging polyurethane laminating adhesive, a pre-test must be conducted. This is a crucial process in ensuring product quality, avoiding production risks, and meeting industry standards in the flexible packaging composite production. It is by no means an optional step. Even if the adhesive parameters meet the factory standards, it cannot be directly put into mass production.
The production of flexible packaging is influenced by multiple factors such as the substrate, ink, production equipment, temperature and humidity, etc. The compatibility of adhesives varies greatly under different working conditions. The lubricants in the film, residual solvents from printing, and the material properties of different brands of substrates all interfere with the bonding effect, and problems such as delamination, blistering, and failure to meet the peel strength standards are prone to occur. At the same time, the curing effect and viscosity state of polyurethane laminating adhesives will also change with the environment. The product instructions alone cannot adapt to the production conditions on site.
Industry regulations clearly stipulate that when new materials are put into production, the base material or ink is replaced, or process parameters are adjusted, small sample tests must be conducted. The routine tests include core items such as bonding strength, compatibility, and curing performance, which can effectively verify the process compatibility and identify bonding risks. For special flexible packaging such as food and medicine, the pre-test can also verify the material safety and ensure that the products comply with regulatory standards.
In conclusion, pre-testing is a fundamental step for controlling product quality, reducing losses, and avoiding compliance risks. It is also a necessary prerequisite for the large-scale production of flexible packaging polyurethane laminating adhesives.
