In-depth analysis of the stable performance of china high power fiberglass mesh tape
Dec 16,2021
Stability during continuous spinning of china high power fiberglass mesh tape: fluid characteristics. When studying the colloidal fiber-forming process, the flow characteristics of the fluid and the flow rate of the fluid were measured, and the problem of the flow stability of the small holes was analyzed. When measuring fluid fluidity, Reynolds number is generally used to identify laminar flow or turbulent flow.
For the circular tube flow of small molecule fluids, the Reynolds number Re increases with the increase of the flow velocity. When Re is greater than 2000, the fluid transforms from laminar flow to turbulent flow. When spinning, the fluid must be kept in a laminar state. Because the viscosity of the polymer melt (melt) is generally very large, the spinning speed is not very high, and the spinning hole diameter is small. Therefore, Re is small.
Generally, turbulence does not occur due to the increase in flow velocity. The Reynolds number of the test colloid in the fiber forming process is generally: Re = (prD)/p = 1.6 x 0.0063 x 0.03/100 = 2.88 x 10-6 where ρ colloid density, g/cm3; D a spinneret hole Diameter, cm; V colloid viscosity, Pa.s.
Due to the inorganic polymer structure characteristics of the china high power fiberglass mesh tape spinneret, the unstable flow is caused by the elastic deformation in the molecule, that is, the phenomenon of non-Newtonian fluid. When the energy of elastic deformation reaches the same as that of the flow energy that overcomes the viscous positive force, unstable flow occurs, which is called elastic flow measurement. Tests have shown that it is less than 305Pa". (3050P) to close the body with a lower teaching rate.
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