The formulation advantages and production value of high-solid-content flexible packaging polyurethane laminating adhesives
2026,08,14
High-solid-content polyurethane laminating adhesives are upgraded products from traditional solvent-based glues. The solid content generally reaches over 75%, compared to the conventional 50% solid content glues, they have significant advantages in terms of material cost, production efficiency and environmental protection indicators. They have now become the mainstream choice for dry lamination in medium and large-sized flexible packaging enterprises. The core feature is a high-concentration resin system and low solvent addition, which balance coating performance and finished product composite quality.
In terms of production efficiency, high-solid-content glues have a high effective resin ratio. Under the same coating dry weight, the glue consumption is lower, which can significantly reduce the glue cost per unit product. At the same time, the solvent usage is greatly reduced, and the VOC emissions are significantly decreased, effectively reducing the load on waste gas treatment equipment and meeting the factory's energy-saving and green production auditing standards.
This type of adhesive has excellent coating adaptability, a wide viscosity regulation range, good leveling performance under high-speed coating conditions, and is less likely to have appearance defects such as orange peel and pinholes. After curing, the adhesive layer is dense and uniform, with stable bonding strength, water boiling resistance and grease resistance properties. It can be adapted to various scenarios such as ordinary packaging and medium-temperature steaming packaging, and has extremely strong versatility.
When using high-solid-content adhesives, precise dilution ratios and drying process matching are required to avoid poor leveling caused by excessive solid content. Reasonable optimization of coating and drying parameters can fully utilize its high solid content, low residue and low cost advantages, and effectively improve production efficiency, reduce environmental and material costs in total.
