The application of the polyethylene glycol (PEG) for consolidation treatment of Suga-fibers, made of raw silk fibers dyed in black, was investigated. The PEG treatment in the range of the concentration 5 wt % to 20 wt% using PEG#1000 and PEG#6000 was found to reinforce the deteriorated iron-silk fiber. The result may indicate that coating of PEG on the fiber surface acted as an antioxidant, and the production of H₂O₂ and OH• might be inhibited. For iron/tannate-silk fibers, the coating with 20 wt% PEG#6000 was the best pre-treatment, while that with 5 wt% PEG#1000 was suitable post-treatment to control the fiber deterioration by accelerated aging. This concluded that the osmotic and flexible PEG is effective for the fragile fiber. Depending on the degradation condition of Suga-fibers, it was important to select the appropriate molecular weight and concentration of PEG solution to reinforce. This study demonstrated that the PEG treatment is useful as one of the conservation treatment of black dyed textiles.

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In order to recycle the waste silk resource effectively, the biodegradable composite consisting of PBS matrix and pure silk paper was prepared by hot compression molding. Beating treatment was adopted to modify silk fibroin and enhance the composite, and the corresponding mechanical properties and morphologies were studied in detail. The results showed that beating treatment could realize the fibrillation of fibroin and improve the tensile strength of silk paper, and proper beating treatment to fibroin could also improve the mechanical properties of silk paper reinforced PBS composite. The tensile, flexural and impact resistance properties of this green composite were improved remarkably with increasing fiber content within 40 wt%. Especially the impact resistance was remarkably improved 154% at 40 wt% fiber content compared with PBS control.

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Generally, the clothing pressure is measured with the sensor set on the surface of the human body or the dummies. It is not possible to measure the clothing pressure without sewing process. We have developed the technology to simulate the clothing pressure without sewing clothing by using the numerical analysis technique. In this research, the numeric knitting model reported with the previous paper is used, and how to contact clothing pattern with sleeves to the human body model is described. Concretely, a temporary body is existed between the human body model and clothing pattern. After the clothing pattern can be contact to the temporary body, it can be contact the human body model. With this method, the clothing pressure values predicted using this computer simulation proved to be very close to the actually measured values. In this study, we show short-sleeved underwear.

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In this paper, computation of flow patterns in circular yarn ducts with various sizes was performed using the commercial CFD (Computational Fluid Dynamics) software package ANSYS CFX 10.0. Simulated results of similarly-enlarged interlacers showed good agreement with experimental data except for a strongly compressible flow region. Simulated results in a strongly compressible flow region were in rough agreement. And then, flow patterns in similarly-enlarged interlacers were exactly the same as those in the practical-size ones to validate the similar enlargement of the interlacer. It is useful to use the ANSYS CFX for calculating the flow patterns in yarn duct and to measure the flow patterns in similarly-enlarged interlacers. On the basis of the simulated results, moreover, effects of size of circular yarn duct of interlacer on flow patterns were clarified and the performance of interlacer was discussed.

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