Friends often ask me: "you have been in the hot melt adhesive industry for nearly 15 years. I ask you a question: is the viscosity of the hot melt adhesive large and the viscosity of the hot melt adhesive large?
It is believed that many people often encounter the problem of melting viscosity, which means the viscosity of heating or melting state under a given condition is determined by viscometer or viscometer, which directly affects the fluidity of hot melt adhesive.
The kinematic viscosity is the measurement of internal friction when the liquid flows under gravity. Its value is the ratio of the dynamic viscosity to the density of the liquid at the same temperature. It is expressed in mm2/s in the international unit system.
The dynamic viscosity indicates the measurement of internal friction when the liquid flows under a certain shear stress. Its value is the ratio of the shear stress and the shear rate added to the flowing liquid. It is expressed in the international unit system by Pa. S, and it is expressed in cP. 1cP=10-3Pa. S
Centistoke and CPS viscosity unit
Centistoke (CST) is the smallest unit of kinematic viscosity, CPS (cP) is the smallest unit of dynamic viscosity.
Hot melt adhesive melt viscosity and plastic viscosity has no direct corresponding relationship, but the characterization of fluid flow properties in the molten state of the melt viscosity of the main choices are directly related to construction technology and the use of hot melt adhesive, glue, glue, nozzle size requirements, adhesive interface material and other relevant properties. However, fluid with large melting viscosity tends to be relatively large in the molecular weight of the intrinsic material, and the cohesive strength will be larger.