Polyurethane Adhesive, as a key bonding material in soft packaging composite materials, has been widely used in food, medicine, daily chemical and other packaging fields because of its excellent performance. This kind of adhesive ensures the barrier, mechanical strength and durability of packaging materials by forming firm adhesion between different substrate layers of flexible packaging.
Performance characteristics
Polyurethane adhesive for flexible packaging has the following obvious advantages:
1.Excellent bonding performance: it can firmly bond various substrates such as PET, BOPP, aluminum foil and PE.
2.Good flexibility: adapt to the bending deformation of flexible packaging during processing and use.
3.Temperature resistance: meet the requirements of heat sealing process, and some products can withstand high temperature sterilization above 121℃.
4.Hygiene and safety: in line with food-grade standards, low migration and low odor.
Technological development
In recent years, the technology of polyurethane adhesive for flexible packaging has been continuously improved.
1. Solvent-free: adopting 100% solid content system to realize zero emission of VOCs has become the mainstream development direction.
2. Water-based system: water is used as dispersion medium, which has excellent environmental protection performance, but high drying energy consumption.
3. Functionalized products: develop special adhesives such as medium resistance and high temperature cooking resistance.
Application area
Polyurethane adhesives are widely used in:
1. Food packaging (such as snack bags and liquid packaging)
2. Drug packaging (blister packaging, medicine bags)
3. Packaging of daily chemical products (shampoo, cosmetics, etc.)
Future trend
With the increasingly strict environmental protection regulations and the increasing packaging requirements, polyurethane adhesives for flexible packaging will continue to develop in the direction of more environmental protection and higher performance, and intelligent and functional products will also become the focus of research and development.
