Blog posts of '2024' 'June'

One of the challenges of using hot melt adhesive, especially during the cold seasons, is the low temperature of the production workshop environment or the cold substrate. Additionally, the temperature drop of the adhesive as it travels to the nozzle tip can prevent the hot melt adhesive from bonding properly.

Membrane adhesive is widely used in various industries, particularly in making cabinets, doors, and interior decor. Key features include high adhesion, moisture and heat resistance, flexibility, and durability. It comes in solvent-based and water-based types, each with specific uses. Proper surface prep, application, and curing are essential for optimal results.

Polyurethane adhesive is used in air filter production for its excellent adhesion to various surfaces, high thermal and chemical resistance, and two-component system. It's ideal for automotive and industrial filters. Hot melt adhesive offers rapid bonding and recyclability, making it suitable for various industries.

Stresses due to contraction arise from differences in thermal expansion. When a liquid adhesive solidifies, internal stresses decrease bond strength. The most common cause is the mismatch in thermal expansion coefficients between adhesive and substrate, especially when solidifying above normal temperatures. Flexible adhesives or matched coefficients can mitigate these stresses.

Viscosity measures a fluid's resistance to deformation or flow. It impacts industrial applications, with water having low viscosity and honey high. Factors like temperature, pressure, shear rate, and environment affect viscosity. Viscosity types include dynamic, kinematic, and bulk. Adhesive performance relies on appropriate viscosity, measured using viscometers such as U-tube, falling sphere, and rotational types.