In the paste dot bonding process, a hot melt adhesive is applied in the form of dots, which can later be laminated with all types of textile materials under the influence of heat and pressure. For the bonding of nonwoven fabrics to itself or to other materials usually a paste-like thermoplastic adhesive dispersion in water is used. These powders can be conveniently applied by a variety of processes in a predetermined pattern and density. Once applied, the paste dots can be laminated with all types of textile materials under the influence of heat and pressure.
Base resins in paste dot adhesive can be almost any thermoplastic. Frequently, polyamide or polyester copolymers are used for garment applications where wash-and-wear properties are required.
RESULTING PROPERTIES
The table above shows typical paste formulation for a polyaester paste dot adhesive. The optimal paste viscosity will depend on the screen being used in the coating process. A viscosity of 3000-8000 mPa-s is recommended for low mesh screens. High mesh screens require lower viscosities (1500-3000 mPa-s).
