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Biodegradable headlinings were developed using jute fiber, PLA (polylactic acid) fiber. More specifically, the main felt which consists of jute fibers and PLA fibers was produced by carding process, and then laminating PLA Films or light PLA felts as reinforcement. After lamination, cotton nonwovens were used as skin layers. Evaluation on the biodegradation of headlinings was tested under conditions (KS M 3100-1 and ISO-14855-1) of aerobic biodegradation. The test results of biodegradable headlinings showed a reduction of weight by 48 % and a decrease of mechanical strength by 90% for the biodegradation period. This feature would be attributed to the decomposition of the bio-materials during its biodegradation.

The aim of this study is to prepare polypropylene (PP) / nickel coated carbon fiber (NiCF) or stainless steel (SUS) fiber composites possessing electromagnetic interference (EMI) shielding effectiveness (SE). A series of conductive composites were prepared by the melt blending method. The EMI SE of conductive composites is 45 dB over a wide frequency range up to 100 MHz, which is higher than that of PP/talc composite used automotive interior parts, viz. 0 dB.

This paper deals with acquisition of the material properties of the thermosetting plastic reinforced with various laminating angles of carbon fibers in order to apply to structural analysis of steering system components. The laminating carbon composites are manufactured as stacking uni-direction carbon prepreg with various fiber orientations from 0 to 90 degree and applying heat and pressure by hot press. We evaluate the modulus and ultimate strength of the CFRP according to the fiber orientation through uniaxial tensile test (ASTM 3039). The composite material shows the strong anisotropic properties according to loading direction. In order to describe the material behavior accurately, the anisotropic material behavior is numerically formulated and for the verification of analysis scheme which is applied in this paper, analysis results of uniaxial tension process of composite material with various fiber orientations are compared with that obtained from the experiments.