Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
Search
Advanced search
OR
Browse
Search
Volume 68, Issue 6
Journal of the Society of Fiber Science and Technology
Displaying 1-11 of 11 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Reviews and News
Columns
Commentations
TATEITO·YOKOITO
Series
Original Articles
Transactions
  • Mass Deacidification Treatments of Acidic Bamboo Paper
    Khine Khine Win, Takayuki Okayama
    2012 Volume 68 Issue 6 Pages 143-148
    Published: 2012
    Released on J-STAGE: August 09, 2012
    DOIhttps://doi.org/10.2115/fiber.68.143
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Suppression of the deterioration of acidic bamboo paper by the Bookkeeper process (BK) and the dry　ammonia ethylene oxide process (DAE) was investigated. These deacidification processes reduce the acidity of both　acidic bamboo and hardwood papers to pH 8, which is comparable to acid-free paper. Deacidified bamboo and　hardwood papers had higher pHs than untreated papers after accelerated aging for one week at 100 °Cin a sealed tube.　Both deacidification processes preserved the mechanical properties (e.g., folding endurance and zero-span tensile　strength) of bamboo papers after one week of sealed tube aging. In contrast, bamboo papers deacidified by BK and　DAE processes exhibited a significance loss in tearing strength after one week of tube aging, compared with deacidified　hardwood papers. The reduction in the tearing strength of deacidified bamboo papers depended considerably on the　reduction in the degree of polymerization during sealed tube aging. Due to the rapid reduction rate of degree of　polymerization during sealed tube aging for one week of bamboo papers deacidified by DAE process, such paper　exhibited appreciably higher degradation rates than bamboo papers deacidified by the BK process.
    View full abstract
    Download PDF (559K)
  • Sterilization of Spent Bathwater and Washed Fabrics by the Addition of Weakly Acidic Electrolyzed Water
    Tetsuya Takahashi, Yoko Tsurunaga, Yuji Aso, Tetsuo Kondo
    2012 Volume 68 Issue 6 Pages 149-155
    Published: 2012
    Released on J-STAGE: August 09, 2012
    DOIhttps://doi.org/10.2115/fiber.68.149
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper attempts to propose a laundry use of spent bathwater in Japan sterilized by non-diaphragm electrolytic treatment (Single cell). Twenty liters of spent bathwater was treated with 25 mL of electrolyzed water obtained by electrolytic treatment to examine its bactericidal effect. The treated bathwater also was used for washing fabrics to examine the antibacterial effect of the treatment on the washed fabrics. Before the experiment, non-treated bathwater was used for washing fabrics and revealed that the washed fabrics had as many as 8.19×103 CFU/mL viable bacteria. When distilled water was used for “rinsing” the washed fabrics, many viable bacteria remained on the washed fabrics, even after “rinsing” for 12 minutes. Addition of 25 mL of aqueous HCl to 20 L of spent bathwater indicated that the acid did not have any bactericidal effect. In contrast, addition of 25 mL of electrolyzed aqueous HCl to 20 L of spent bathwater almost completely eliminated viable bacteria. Moreover, when the treated bathwater was used for washing fabrics dipped in the spent bathwater, few viable bacteria were found on the washed fabrics. These results demonstrate that non-diaphragm electrolytic treatment was very effective at killing bacteria in spent bathwater and at sterilizing fabrics washed in the treated bathwater.
    View full abstract
    Download PDF (1517K)
  • The Use of Weakly Acidic Spent Bathwater Mixed with Electrolyzed Water for Laundry
    Tetsuya Takahashi, Yoko Tsurunaga, Yuji Aso, Tetsuo Kondo
    2012 Volume 68 Issue 6 Pages 156-163
    Published: 2012
    Released on J-STAGE: August 09, 2012
    DOIhttps://doi.org/10.2115/fiber.68.156
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This study was conducted to develop a method for reusing of spent bathwater in Japan which was disinfected　by weakly acidic electrolytic treatment. Electrolyzed water obtained from electrolytic treatment without a diaphragm　(single cell) was diluted with spent bathwater and used to launder fabrics. The spent bathwater did not remove dirt from　the fabrics well, but it effectively sterilized the washed fabrics. The detergent efficiency was found to decrease by about　5% when spent bathwater was used when compared to non-treated spent bathwater. The decreased detergent efficiency　was believed to be caused by reduced foaming and affinity. To obtain a sufficient sterilization effect without decreasing　detergent efficiency, untreated spent bathwater was used for washing, after which spent bathwater mixed with　electrolyzed water was used for rinsing. Even when rinse times as short as one cycle for 3 min were used, this method　led to sufficient sterilization of fabrics for laundry. Additionally, odor testing using an odor concentration meter and　evaluation by a monitor panel showed that electrolytic treatment markedly decreased the odor level of the test fabrics.　Overall, these findings indicated that bacteria on fabrics could be effectively attenuated with no decrease in detergent　efficiency if electrolyzed water diluted with spent bathwater was used for rinsing after washing with untreated spent　bathwater.
    View full abstract
    Download PDF (1442K)
  • A Study on Local Compression Behavior of Brake Friction Materials　by Means of Digital Image Correlation Method
    Kojin Kawabe, Takahiko Kawai, Tadashi Komoto, Shin-ichi Kuroda
    2012 Volume 68 Issue 6 Pages 164-171
    Published: 2012
    Released on J-STAGE: August 09, 2012
    DOIhttps://doi.org/10.2115/fiber.68.164
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The inhomogeneous compressive strain behavior of the friction material was analyzed by means of digital　image correlation method (DICM). Macroscopic strain of the sample without a cashew decreased monotonically with　the increasing molding pressure, and DICM analysis indicated homogeneous strain distribution. While sample　containing cashew showed a peculiar molding pressure dependence in macroscopic strain, which the strain increased　remarkably above 30 MPa. The result of DCIM analysis indicated that the void structure introduced by the spring-back　periphery of cashew caused the inhomogeneous strain distribution as well as larger deformation upon the compressive　load. It was also found that the addition of cashew and mica greatly enhanced the void formation.
    View full abstract
    Download PDF (3333K)
  • Effect of PVA Binder on the Mechanical Properties of Silk/Bamboo　Paper-Reinforced PBS Green Composite
    Ruoyuan Song, Teruo Kimura
    2012 Volume 68 Issue 6 Pages 172-177
    Published: 2012
    Released on J-STAGE: August 09, 2012
    DOIhttps://doi.org/10.2115/fiber.68.172
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A biodegradable composite consisting of poly(butylene succinate) (PBS) matrix and polyvinyl alcohol (PVA) binder-reinforced silk/bamboo paper was prepared by hot compression molding, in order to make more effective use of waste silk resources. The use of PVA binder enhanced the mechanical properties of both silk/bamboo paper and silk/bamboo/PBS composite for a range of binder contents. These enhanced properties were studied in detail, and results indicated that with increased PVA binder content, the tensile strength, tensile modulus, and elongation of the hybrid papers increased. PVA binder-improved silk/bamboo paper was better able to reinforce PBS composite compared to paper with zero binder content. The tensile and flexural properties of this green composite were improved remarkably, although impact resistance was degraded to some extent.
    View full abstract
    Download PDF (1548K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top