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Volume 30, Issue 1
Displaying 1-3 of 3 articles from this issue
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Yumiko Hattori, Masako Niwa, Sueo Kawabata1984 Volume 30 Issue 1 Pages 1-12
Published: 1984
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSChanges in the mechanical properties and handle of woven fabrics caused by repeated shear deformation are observed by using the fabric fatigue testing machine, KES-F5. Sinusoidal shearing deformation 11.3° in amplitude and 5Hz in frequency was imparted on fabric specimen kept streched by a constant extensional force. Mechanical properties of the specimen are measured by KES-FB fabric-testing system before and after the repeated loading and also during the repeated loading by stopping the repeating loading temporarily.
Mechanical properties of specimen was found to change continuously with increasing repeat cycles, and some mechanical properties change rapidly after 105 cycles for all specimen. Among these mechanical properties, hysteresis behaviours in tensile, bending, and shear deformation increased most remarkably with increasing cycles. More hysteresis increase was observed in lower quality fabrics than in higher quality fabrics.
Fabric fatigue was accelerated considerably when a small amount of carborundum powder was put on specimen surface and this carborundum method was found to be useful as a quick simulation of fabric fatigue in long-term wear.View full abstractDownload PDF (1297K) -
Part 2: Structures of Pile FabricsToyonori Nishimatsu, Teiji Sawaki1984 Volume 30 Issue 1 Pages 13-17
Published: 1984
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSStructures and characteristics of backing layers and pile layers of pile fabrics were studied. Results obtained are as follows.
(1) Assuming that the structures of the backing layer is 3-pick terry, the basic setting value for ground warps (EGO) and wefts (ESO) may be expressed by: EGO=EG(√<G>+√<P>)/48.6 ESO=ES(3√<W>+2√<P>)/121.5 where the basic setting value is the end density of the pile fabric woven by ground warps 1s, wefts 1s and the pile warps 1s. EG is the warp density, ES the weft density. G is the yarn count of ground warps, P the yarn count of pile warps, and W the yarn count of wefts.
(2) The pile inclination (θ) may be calculated by, θ=cos-1(1/0.33 ES+dp/2)/(lh+dp/2) where ES is the weft density, dp the pile diameter and lh the pile inclination length.
(3) Frictional and compressive properties of pile fabrics were not influenced by the fabric density of the backing layer.View full abstractDownload PDF (518K) -
Ikuko Maekawa, Toshihiro Gunji, Tsuneyo Tsuboi1984 Volume 30 Issue 1 Pages 18-27
Published: 1984
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSTests were carried out with a gonio-photometer to investigate optical properties of silk-like synthetic fiber fabrics. To compare silk-like fabrics with natural silk fabrics, habutai and crepe de chine of silk-like synthetic fibers as well as those of natural silk fibers were used as samples. The following results were obtained:
1. The difference in optical properties of silk-like and natural silk fabrics can be distinguished by comparing their reflected light distribution curves and quantity of reflection obtained by revolving specimens.
2. Little differences have essentialy been found between silk-like and natural silk fabrics. However a detailed observation has revealed that a silk-like fabric has little amount of diffused reflected light and the specular reflected light of a silk-like fabric tends to gather. This causes the visual sensory differences in luster.
3. Sensory tests were carried out of a difference in luster of a silk-like and a natural silk fabric. The crepe de chine of a silk-like synthetic fibers can be distinguished from that of natural silk fibers by the difference of degree of creping. By contrast, a habutai of silk-like synthetic fibers can not completely be distinguish from that of natural silk fibers. In other words, a habutai of polyester fibers is much similar in visual luster to that of natural silk fibers.View full abstractDownload PDF (1526K)
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