Abstract
The mechanism for liquid epoxy resin impregnation through polyester nonwoven fabric, sandwiched between two circular glass plates in atmospheric pressure, has been studied by the Kozeny-Carman equation improved by the introduction of the theoretical calculated capillary force and the gas leakage parameter for the void formation in the impregnating area. Impregnating velocity increases with reduced gas pressure. Experimental data on the vacuum impregnation were analyzed by the improved Kozeny-Carman equation by using wettability under measurements of the ascending heights due to liquid epoxy resin impregnation in a vacuum. The gas leakage quantity, obtained from the gas leakage parameter, is related to the gas pressure at the starting point of the impregnation. Voids for most of the impregnation stage disappear with passing impregnating time, 120 minutes as well as breaking the vacuum in the chamber.
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Kurematsu, K., Koishi, M. Pressure dependence of liquid epoxy resin impregnation through polyester non-woven fabric in vacuum. Colloid & Polymer Sci 263, 638–646 (1985). https://doi.org/10.1007/BF01419888
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DOI: https://doi.org/10.1007/BF01419888