Polyurethane adhesive - A good helper for flexible packaging

In our daily lives, from the fragrant snack bag at hand to the dazzling array of sauce packets on supermarket shelves, these lightweight yet sturdy soft packages have long been everywhere. The key "hero" that enables these packages to be laminated layer by layer, moisture-proof, fragrant and withstand the jolts of transportation is a special material called flexible packaging-specific Polyurethane Adhesive. It is like a "super adhesive" in the packaging industry, quietly safeguarding the quality and safety of the products.

 

The magic of this adhesive lies in its unique chemical structure and application method. It is usually composed of two core components and needs to be precisely mixed before use. When they are evenly coated on the film material and heated in the drying tunnel, a chemical reaction occurs, forming an extremely strong and flexible adhesive layer. This layer of adhesive not only can closely "sew" together different materials such as plastic, aluminum foil and paper to form a solid composite structure, but it must also have excellent temperature resistance and stability to ensure that the packaging remains intact and does not delaminate or fall off in the harsh environment of high-temperature steaming or low-temperature freezing.

 

As people's demands for the quality of life and environmental protection continue to rise, the technology of this type of adhesive is also constantly evolving. In response to the calls for health and environmental protection, mainstream products have now fully shifted to water-based or solvent-free types. Through innovations in formula and production process, they have successfully avoided the possible residue and emission problems of traditional solvent-based products, making the final packaging cleaner and safer, while also reducing the impact on the environment, which is in line with the trend of green manufacturing in The Times.