| Currently, poor moisture permeability is a common reality in the using process ofthe tent. When temperature is lower outside but higher inside the tent, the heat emittedfrom human body will condense into water droplets on the inner-wall due to the coldair outside. Droplets will flow down the tent wall and wet the sleeping bag, whichwould generate a sticky wet feeling and affect the comfort of living. With thelaminated composite technology becomes maturing in the clothing field, there is agreat prospect to apply this technology to the tent fabric production. Conforming tothis trend, this project aims to develop a double composite tent cloth with excellentwaterproof and breathable performance using the laminated composite technology.This double composite tent cloth is made up with polyester plain weave fabric ofsame porosity for both lining and skin layer, waterproof and breathable membrane inthe middle, and the three were integrated as a whole by adhesive bonding.Polyester filament, with the size of220D/72f and mean fracture strength up to1200CN, was selected as raw material for this project. The texture was plain weave,which is the most common weave in tent base fabric. Based on experience andrepeated test weaving, the fabric porosity is determined as17%,20%and23%.Calculating with the porosity, the warp and weft density of the three different fabricsare respectively:250roots/10cm,226roots/10cm;234roots/10cm,213roots/10cm;220roots/10cm,200roots/10cm. The weaving was completed on rapier loom aftersetting the machine parameters.Three kinds of TPU waterproof and breathable membrane with different WVTwere chosen for this project. According to the measurement, the contact angles of thethree membranes were respectively:117.5°,102°and95°. Observing the surfacestructure under the scanning electron microscope of KYKY-2800B, we can see thatthe three film surface has no pores: nonporous waterproof and moisture permeablemembrane. The polyurethane hot melt adhesive powder was selected as the binder,crumb melting temperature of60°C by differential scanning calorimetric (DSC) andthermal gravimetric analysis that the decomposition temperature of370°C. Seen byDSC and TG curves, the thermal properties of the three kinds of films is similar.The optimal process plan was determined through single factor experiment andorthogonal test: the glue quantity between film and fabric、lining were respectively:20g/m2、15g/m2; hot-pressing temperature:80℃; hot-pressing time:70s. Under thisprocess plan, the three kinds of membranes and the three different fabrics were composited respectively into nine different composite cloths. The mechanics,windproof, waterproof and breathable, and warm performance of the nine kinds ofcomposite fabric were measured and it can be concluded through the experimentaldata:(1) Compared with gray fabric, double layer composite fabric breaking strengthincreased by60%, tear drop, and fabric porosity greater decline is larger, porosity of23%fabric composite decline by around20%;(2) The moisture permeability of thecomposite fabric depends primarily on the moisture permeability of the membrane;considerable degree of porosity and the waterproof performance of the film of thebase fabric on the waterproof performance of the composite fabric; the physicalmechanical properties of the composite fabric is determined by the mechanicalproperties of the fabric;(3)9#composite cloth got the best overall performanceamong the nine, the WVT of up to5010g/(m2·24h), which can well improve the tentdripping phenomenon.The double layer composite tent cloth can not only improve moisture permeable,but also extend the service life. In addition, different camouflage printings on eachside can meet the needs of soldiers for different environments. The research providesscientific basis and reference value for the tent fabric research in waterproof andmoisture permeable aspect. |
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