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Extensive research has been carried out worldwide to find better plastic fuel barrier materials to meet increasingly stringent requirements due both to more restrictive emissions legislation and to the fact that widely different gasoline compositions are being used. This review accounts for the most recent progress in the field. Starting from a discussion of the fundamental aspects on permeation through polymer media, it also highlights current advancement in the areas of chemical surface treatment, multi-layered assembling and blending.

In this paper, we demonstrate the feasibility of a novel continuous regeneration process for cabin air humidity control. The technique does not require the use of moving wheels or beds, and may be powered using waste heat. The operation is based on the use of trilobal (wicking) fiber technology. The trilobal fibers are arranged in a continuous parallel array, which is formed into a flat panel water transfer element. The fibers are impregnated with desiccant salt solutions (calcium chloride, lithium chloride, etc.) which are capable of reversible capture of gas phase water molecules. Steady state water transfer was achieved using a number of dessicant salt solutions. The effects of critical variables such as residence time and the quantity of fiber on the level of water transfer were also determined.

The removal of toxic, corrosive, irritant, and odorous gases is a key strategy in improving air quality in any closed space. The technologies of granulated activated carbon or chemically impregnated dry media are commonly employed to address this issue. Both of these methods have their limitations in manufacturability, volume of space, and/or pressure drop associated with use in a given application. A new air quality technology has been developed which integrates liquid based chemisorption gas treatment with a shaped fiber media carrier. The patented wicking fiber shape holds more than its own weight in active reagents within intra-fiber channels. While the liquid volume is captured and retained through capillary action, a large surface area of the chemisorptive liquid is presented to the air flow for reaction and neutralization of the target contaminant gases. The wicking fibers may be implemented as fiber bundles, woven materials, or as non-wovens.