Structural adhesive is a specialized type of adhesive characterized by high strength, high viscosity, and high expansion properties; it possesses safe chemical properties and exhibits favorable biodegradability. Unlike traditional glues, the cured matrix formed by structural adhesive after application effectively fills the microscopic surface textures of the materials being bonded, thereby creating a significantly stronger bond between the two substrates. Consequently, structural adhesives are widely utilized across various industrial sectors, such as automotive manufacturing and construction.
Adhesives of this category are predominantly Hot Melt Adhesives. Formulated based on low-melting-point polymers-such as EVA and polyethylene-these adhesives are applied by being heated to a molten state and then sprayed or dispensed onto the substrate; upon cooling, they rapidly solidify to complete the bonding process. Compared to traditional water-based adhesives, hot melt adhesives require no drying phase; they offer rapid curing, high operational efficiency, and energy savings, making them the preferred choice for modern automated production lines for sanitary napkins.