| Summary: | 博士 === 逢甲大學 === 纖維與複合材料學系 === 105 === Rapid population growth leads to the prosperous economic activities all over the world, which enables people to consume more products with better quality and higher prices. At the same time, high yields and high consumptions create more quantity of waste. We need to effectively recycle and reclaim the waste sources in order to pursue a sustainably developing and manageable environment. For example, the domestic textile industry has been produced a considerable amount of textile products, and simultaneously an excessive amount of textile waste are accumulated.
In this study, recycled fibers are made into nonwoven fabrics, which are then combined and laminated to form industrial-grade environmentally protective insulating sandwich-structured composites. Recycled far infrared polyethylene terephthalate fiber (RPET) and three-dimensional crimped hollow polyethylene terephthalate fiber (TPET) fiber are blended at different ratios, and then combined with a specified amount of 20 wt% low melting temperature polyethylene terephthalate fiber (LPET). The materials are formed into RPET/TPET/LPET matrices using a nonwoven manufacturing process and needle punching. The matrices have different interlayer of aluminum foil, glass fiber, or carbon fiber to make the sandwich-structured composites with an attempt to attain insulation function via strengthening the heat reflection efficacy of the matrices. Moreover, the composites are tested in terms of air permeability, far infrared emissivity, stiffness, tensile strength, bursting strength, stab resistance, tear strength, and temperature-rise property, examining the influence of fiber mixing ratio, needle-punch frequency, and hot pressing parameters.
The test results show that mechanical properties of the RPET/TPET/LPET matrices slightly decrease, but the insulation level is comparable when the matrices are composed of a greater amount of FPET fibers. Out of the three RPET/TPET/LPET blending ratios, 60/20/20 wt% is examined to be the optimal and used for sandwich-structured composites. The matrices and aforementioned interlayers are laminated with different layers, after which they are needle punched at 100 needle/min and hot pressed at 140℃ to form insulating sandwich-structured composites. In particular, when the number of layers is 4 and the interlayer is an aluminum foil, the insulating sandwich-structured composites (A/PET) have the optimal heat resistance and insulation effect of 27.15℃.
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