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In the modern packaging industry, flexible packaging is highly favored by the market for its lightweight, flexibility, and aesthetic features. The quality of flexible packaging largely depends on the performance and use of adhesives. Today, let's discuss how to choose the right adhesive in the flexible packaging production process.
Different flexible packaging products have varying requirements for adhesive performance. For instance, for packaging that needs to withstand high-temperature sterilization, we must choose adhesive for flexible packaging that can endure high temperatures to ensure that the product does not delaminate or bubble during sterilization. Similarly, for packaging that needs to be refrigerated or frozen, we must choose adhesives that can maintain good adhesion at low temperatures. Therefore, when choosing adhesives including solvent free polyurethane adhesive, it is essential to clarify the specific needs of the packaging product first.
Flexible packaging uses a variety of materials such as BOPP, PET, BOPA, AL, etc. These materials vary in their physical and chemical properties. Hence, when choosing lamination adhesives for flexible packaging, the compatibility and matching of the materials must be considered. For example, when laminating aluminum-coated films, due to the particularity of the aluminum-coated layer, ordinary adhesives may not meet the requirements. At this point, dedicated aluminum-coated film laminating adhesives are needed to improve peel strength and prevent aluminum transfer.
In the dry composite production process, the performance of the equipment significantly impacts the effectiveness of the adhesive. For example, the tension control system and working speed of the equipment will affect the choice and use of adhesive. If the equipment's tension control system is poor, adhesives with good initial tack should be prioritized to reduce tunnel formation. If the equipment's working speed is high, low-viscosity adhesives for flexible packaging including water based laminating adhesive should be selected to avoid generating a large number of bubbles in the glue tank, which can affect the coating effect and product quality.
When choosing adhesives from Comens, one of the leading industrial laminating adhesive manufacturers, in addition to considering their performance and compatibility with the equipment, economic factors must be considered. Generally, the higher the working concentration of the adhesive, the better its economic efficiency. Therefore, under the same process conditions, we should choose adhesives with high solid content and use the highest possible working concentration to improve production efficiency and reduce costs.
In summary, the selection of appropriate adhesives for flexible packaging including solvent based adhesive for flexible packaging requires considering multiple factors. Only by comprehensively considering the specific needs of the packaging product, material compatibility, equipment performance, and economic efficiency can the most suitable adhesive be selected to ensure the quality and performance of the flexible packaging product.
