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Volume 51, Issue 4
Displaying 1-15 of 15 articles from this issue
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Katsutoshi Ando, Goro Kondo1995 Volume 51 Issue 4 Pages 164-168
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSPolypropylene fibers consist of a complicate higher-order structure and contain additives such as antioxidant, polar polymer and nucleating agent, hence, the origin of carrier traps is complicated. After carriers were trapped adequently into a nonwoven fabric by corona charging, the effect of additives was investigated by thermally stimulated current. As results, even a small amount of additives affected largely upon thermally stimulated current and enlarged the intensity of peak and the polarization charge. These phenomena may be the result of increase of physical and chemical traps formed by additives. The thermally stimulated current originated from trapped carriers and polarization of electret polypropylene fibers was found to closely concern with the molecular motion of polypropylene. Furthermore, the polarization charge increased by additives affected upon filter performance.View full abstractDownload PDF (336K) -
Yoshihiko Onogi, Noriko Miura, Chikako Matsuda1995 Volume 51 Issue 4 Pages 169-175
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSThe decay of triboelectric charges on textile fabrics was analyzed in detail by the use of a static charge tester. The decay of triboelectric charges was measured in two situations, grounded and ungrounded. In case where fabrics were grounded, the charge dissipation by conduction to the earth was confirmed to be the free diffusion of electric charges. On the other hand, in case where ungrounded, some water molecules were bound firmly within fibers not to contribute to discharges, and some other free might diffuse together with charges into the air to diminish the charges on fabrics.View full abstractDownload PDF (513K) -
Wenxing Chen, Toshiki Koyama, Kenji Hanabusa, Hirofusa Shirai1995 Volume 51 Issue 4 Pages 176-180
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSThe preparation and the antibacterial activity of silk fibroin fibers containing metal complexes of Cu2+, Zn2+, Ni2+, Fe2+, and Ag+ were studied. The metalation was carried out in aqueous solutions of metal ions at low pH and in the solution of metal-ammine complexes at high pH using untreated silk fibroin fiber and fibers treated with a tannic acid aqueous solution. In solution of metal ions at low pH, unstable metal complexes were formed on the fiber without tannic acid, and exhibited no antibacterial activity owing to the low content of metal ions. From the metal-ammine complex solutions, very stable complexes were formed on the fiber but exhibited no activity owing to the high stability of biuret type complexes formed. On the other hand, metal complexes of Cu2+, Fe2+, Ag+ with tannic acid were formed on the fiber treated with tannic acid even at low pH. But the fixation of the complexes onto the fiber was not enough. Only Ag(I)-tannic acid complex on the fiber exhibited the antibacterial activity even in the low content. The sufficient metalation of the fiber containing tannic acid were under-gone in solutions of metal-ammine complexes of Cu2+, Zn2+, and Ni2+. These complexes on the fiber formed with tannic acid as ligands without peptide-nitrogen, and exhibited the strong antibacterial activity. Metalated silk fibroin fibers obtained from the metal-tannic acid complexes were effective, as one of the functional fibers, for the anti-bacterial fibers.View full abstractDownload PDF (349K) -
Toyonori Nishimatsu, Taichi Matsumoto, Sadamu Sekiguchi, Eiji Toba1995 Volume 51 Issue 4 Pages 181-185
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSOptical non-contact detection of the surface roughness of felts was successfully realized by the use of an optical fiber bundle and a photosensor. Experiments done on various kinds of felts revealed that the visual evalua-tion of roughness by human judgement had high correlation with the estimation by this optical method but not with that by the conventional friction method using a surface tester. The present technique was verified to offer a method to measure the surface irregularity of felts which is objective in contrast to visual judgement, as well as more reliable than the friction method that may perturb the natural states of surface tested.View full abstractDownload PDF (330K) -
Seiji Tokino, Tomiji Wakida, Yukihiro Sato, Takeshi Kimura, Hiroshi Uc ...1995 Volume 51 Issue 4 Pages 186-191
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSSix kinds of engineering plastic films (polypropylene, poly (ethylene terephthalate), polycarbonate, nylon 6, polyimide, and p-aramid) and five textile fabrics (polypropylene, polyester, nylon 6, wool, and m-aramid) were treated with atmospheric low-temperature plasmas in the presence of helium/argon and acetone/argon. Adhesion of the plasma-treated films and fabrics with adhesive tape by 180° peeling test was generally increased except for polyimide film. Surface characteristics of the films were investigated by means of SEM, ESCA, and critical surface tension. Surface tension and O1s intensity of the ESCA spectra increased by the plasma treatment.View full abstractDownload PDF (992K) -
Keiko Suganuma1995 Volume 51 Issue 4 Pages 192-196
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSThe colour difference of reactive dyed fabrics with several soaping agents and the colour change of them after washing were investigated by means of L*, a*, b* uniform colour scale, from the viewpoint of Fluorescent Brightning Agents (FBA) effect. In conclusion, little colour difference was observed between dyed fabrics in the case of soaping by nonionic surfactant, higher alcoholic neutral detergent or soap and the blank soaped ones, while with sodium carbonate it was observed fairly well in the range of medium to some extent deep depth. FBA built detergent induced the colour change of light colour fabrics. In this paper, I proposed the quantitative method and the criterions using the critical lightness Lc* and the constant K in order to estimate the effect of FBA built deter-gent on colour change. The Lc* value changed with the hue and the constant K did with the hue or with the washing method during washing. The colour change could not be observed after washing when fabrics were soaped by FBA built detergent.View full abstractDownload PDF (319K) -
1995 Volume 51 Issue 4 Pages P185
Published: 1995
Released on J-STAGE: June 30, 2008
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MASAHIDE YAMAMOTO, SHINZABURO ITO1995 Volume 51 Issue 4 Pages P144-P149
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
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EIJI YASHIMA, YOSHIO OKAMOTO1995 Volume 51 Issue 4 Pages P150-P155
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
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TOSHIYUKI IKUHARA, TAKESHI OKA1995 Volume 51 Issue 4 Pages P156-P160
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
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HIROSHI INAGAKI1995 Volume 51 Issue 4 Pages P161-P162
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
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[in Japanese]1995 Volume 51 Issue 4 Pages P172-P174
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSDownload PDF (253K) -
[in Japanese]1995 Volume 51 Issue 4 Pages P175-P177
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
JOURNAL FREE ACCESSDownload PDF (775K) -
[in Japanese]1995 Volume 51 Issue 4 Pages P178-P181
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
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MINORU KIMURA1995 Volume 51 Issue 4 Pages P182-P184
Published: April 10, 1995
Released on J-STAGE: June 30, 2008
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