Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 62, Issue 8
Displaying 1-10 of 10 articles from this issue
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Column
Commentation
Reports
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  • Friction Property of Multi-Layer Interlocked Fabric Reinforced COPNA Resin Composite
    Hiroshi Suwa, Michiya Ota, Akira Kojima
    2006 Volume 62 Issue 8 Pages 175-179
    Published: 2006
    Released on J-STAGE: October 01, 2006
    DOIhttps://doi.org/10.2115/fiber.62.175
    JOURNAL FREE ACCESS
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    Composite materials were made from multi-layer interlocked fabrics which were woven with pitch-based carbon fiber rovings and COPNA resin matrix. Thermal conductivity of the composite materials were measured by guarded heat flow meter method and transient hot wire method. Limiting PV value of the composite materials were measured by using cylinder/plate friction machine. Then, the relation ship between the structure of multi-layer interlocked fabric and those properties of materials was investigated. The result are summarized as follows; The thermal conductivity and limiting PV value of composite materials were higher than those of single COPNA resin material. It was found that self-lubrication of the composite materials was effectively expressed by the fabric structure with carbon fiber rovings highly dispersed.
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  • Structural Changes in Poly(ethylene terephthalate)Induced by Supercritical Carbon Dioxide Containing a Cosolvent as a Modifier
    Kazumasa Hirogaki, Xi Zhao, Isao Tabata, Kenji Hisada, Satoko Oku ...
    2006 Volume 62 Issue 8 Pages 180-185
    Published: 2006
    Released on J-STAGE: October 01, 2006
    DOIhttps://doi.org/10.2115/fiber.62.180
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    In order to investigate the structural changes in PET yarn induced by scCO2 treatment and the effect of the additive 1-BuOH on these structural changes, WAXD measurements, DSC analysis and FT-Raman spectroscopy analysis were performed for undrawn PET gut yarn treated with pure scCO2 (120deg, 25 MPa) or scCO2/1-BuOH (120deg, 25 MPa/5.0 mol%). The PET yarn treated with pure scCO2 had a semi-crystalline structure with small and imperfect crystallites and oriented amorphous supermolecular segments. The yarn treated with scCO2/1-BuOH showed higher crystallinity and lower distribution of extended chains, such as oriented supermolecular segments, in the amorphous region than the yarn treated with pure scCO2. Based on these results, we hypothesized on the process of structural change in scCO2 and in scCO2/1-BuOH. We found that the addition of 1-BuOH to scCO2 brings about a significant change in the structure of the PET gut yarn immersed in scCO2.
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  • Water and Air Permeability for Polyester Fabrics
    Ayako Makabe, Akira Takaku
    2006 Volume 62 Issue 8 Pages 186-190
    Published: 2006
    Released on J-STAGE: October 01, 2006
    DOIhttps://doi.org/10.2115/fiber.62.186
    JOURNAL FREE ACCESS
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    The water permeability was studied in comparison with the air permeability for a series of polyester fabrics. The experimental apparatus for the water permeability measurement is composed of a vertical cylinder at the bottom of which a specimen is attached. The water filled in the cylinder flows by its weight through the specimen. The water flow was measured as a function of time in the water pressure range from about 6.63 to 2.22 kPa. The water pressure drop by the specimen, obtained after correcting the water pressure drop inherent to the apparatus, changed in proportion to the water flow rate. The proportional coefficient of the pressure drop against the flow rate was defined as the water permeation resistance Rw. The air flowresistance Ra was measured by separate experiments. The water flow resistance Rw was proportional to the flow resistance of air Ra, and the flow resistance ratio Rw/Ra was 71.1. According to the Darcy's law the flow resistance ratio Rw/Ra equals the ratio of the water viscosity ηw to the air viscosity na. The value of the viscosity ratio nw / na , which is calculated with the viscosity values of 1.00 mPa*s for water and 18.1 uPa*s for air, is 55.2. This value of viscosity ratio nw / na agrees reasonably with the value of flow resistance ratio Rw/Ra obtained experimentally.
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