Composite process and use of low solids binders

"Composite" refers to a generic name for a composite of two or more films or aluminum foil, paper and other substrates. Composite products can not only maintain the excellent properties of single-layer substrates, but also make up for their respective deficiencies. After compounding, they have new features and meet the different requirements for flexible packaging of food and other commodities.

Composite processes should include composite substrates, adhesives, composite equipment, and processing techniques. Due to the relatively extensive contents, we now discuss with you the following related aspects.

Low solids binders are binders containing less than 35% solids. They are characterized by low solids and high viscosity. They are the earliest model of polyurethane dry composite adhesives due to its high viscosity. , Large molecular weight, poor fluidity, poor leveling, so that the adhesive on the substrate infiltration time is too long, complex machine speed is slow, and poor transparency, not suitable for high-speed machine (100 meters / min) on the use.

Due to the traditional concepts and actual equipment that have been formed before, domestic low-speed machines are still using such low solid content adhesives as low-end products.