In Japan, where a safe and secure society has been established, stab proof clothes that are suitable for police and security officers supporting are required. The current stab-protection clothing uses mainly metal plates, and there are various problems, such as weight and poor comfort. This study therefore seeks to improve the comfort of stabresistant clothing, clarify the mechanism of stab-resistant clothing, and optimize its structure to achieve low cost. The test equipment was developed in this study. We attached a knife to the tip of an air cylinder. This device penetrates a sample, and the load and displacement can be measured. A sharp instrument such as an ice pick penetrates a sample easily because it passes between the fibers of the textile. Therefore, we suggested using a textile with a nonwoven fabric structure so that the instrument would strike the fiber. Experiments revealed that non-woven fabric has considerably higher stab resistance than other fabrics.
Heat transfer rate from a copper plate into air across the cloth dyed with a dye absorbing infrared rays was measured with and without irradiation from the infrared lamp. The copper plate was maintained at temperature of human body by hot water flown backside of the plate. Over-all heat transfer resistance of dyed cloth was larger than that of nondyed cloth, that is, the dyeing cloth promoted the heat retaining of clothes. The heat transfer resistance also increased by the irradiation from the infrared lamp. The heat transfer coefficient of air boundary film adjoined dyed cloth divided into the convectional heat transfer coefficient and the radial heat transfer coefficient by use of the convectional heat transfer coefficient obtained for a non-dyed cloth. The radial heat transfer coefficient of dyed cloth decreased to about 1/3 of that of non-dyed cloth, which might be dominant because of the promoting heat retaining of clothes. The radial heat transfer coefficient decreased by the irradiation from the infrared lamp, and the value became negative for the dyed cloth, which indicated that the absorption heat of radiation overcame the emission one. Absorption of heat irradiated from the infrared lamp, which is indicated by the difference in the radial heat transfer coefficient between without and with the irradiation of infrared lamp, increased by dyeing the cloth. This was supported by the large increase in surface temperature of dyed cloth with the irradiation from infrared lamp.
There are no sensors, which satisfy all conditions such as flexibility, stretch, thinness and low cost although there are various sheet type pressure sensors. We have developed a new type of pressure sensor using the compression property of textile, and we have already evaluated the response characteristics of the textile sensor. In this paper, we made several textile sensors with different position and number of the electrically conductive weft yarns and different number of electrically conductive warp yarns, and investigated their pressure detective properties. The detective pressure decreased with an increase of the distance between the boundary of hollow and the electrically conductive weft yarn. Furthermore, the detective pressure also decreased with an increase of the number of electrically conductive weft or warp yarns. In addition, increasing electrically conductive weft or warp yarns reduced the standard deviation of detective pressure.
Interlaced yarn alternately has tangling parts and opening ones. It is produced by hitting steadily air with a fixed high-pressure on the multi-filament yarn, which runs at a fixed speed, using the air injection equipment called an interlacer. In order to clarify a mechanism of this production, we used a yarn constructed of small number of filaments with large fineness, carried out a model experiment that the resting yarn was hit at a second by high-pressure air, and tried the generation of interlaced yarn. As a result, a single-blowing experiment showed that an opening part and two tangling parts were generable at a certain probability on some conditions. Furthermore, we carried out a two-blowing experiment that the second air jet is hit on another yarn position apart from the yarn position on which the first air jet was hit. It showed that an interlaced yarn with new opening part and tangling one was generable at a certain probability.
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