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Volume 44, Issue 10
Displaying 1-14 of 14 articles from this issue
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Kazushi Fujimoto, Koichi Iohara, Shinji Owaki, Yasuhiro Murase1988 Volume 44 Issue 10 Pages 477-482
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe effect of air drag on fiber structure formation in high-speed spinning of fine denier filaments of poly (ethylene terephthalate) has been investigated for take-up velocity up to 6, 000m/min. Air drag force increases with increasing the distance between spinneret and take-up roller without changing other spinning conditions. In the case of 1.5 denier/monofilament taken-up at 4, 000m/min, fiber structure changes from partial crystalline phase to amorphous one with increasing the distance, though spinning conditions such as through-put rate and cooling rate are not changed. This indicates that the air drag largely influences the fiber structure formation for the case of fine take-up denier. The exceeding increase of the air drag force causes a cold drawing between a solidification point and take-up roller. This cold drawing lower the fiber velocity at the solidification point. Consequently, crystals are not sufficiently developed below the solidification point.View full abstractDownload PDF (357K) -
Nobuo Ogata, Fumio Yoshimura, Teruaki Yanagawa, Koukichi Yoshida1988 Volume 44 Issue 10 Pages 483-489
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe morphology of poly (phenylene sulfide) (PPS) was investigated by transmission electron microscopy. It was found that the fastest growth direction of the crystal was b-axis. Small angle X-ray scattering showed that a drawn PPS sample had a long period along the draw direction. DSC measurements showed that PPS crystallized rapidly during annealing process, and that long annealing time was necessary in order to stabilize the crystal structure. From TMA measurements, it was found that PPS deforms markedly above the lower melting point Tm′.View full abstractDownload PDF (2121K) -
Koh-ichi Kajiyama, Tayoko Tsuruoka1988 Volume 44 Issue 10 Pages 490-496
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSGas chromatography of the mixtures of various 0-methyl- and O-ethylglucoses prepared from partially 0-methylated and O-ethylated celluloses respectively by acid hydrolysis was carried out on silicone OV-1, OV-7 and OV-17 columns by the linear temperature-programmed method after the mixtures being converted to alditol acetates. The correlation between the chemical structures and the retention indices was studied in detail by introducing a parameter, Δ based on an assumption of the additive contributions of each structural unit to the retention index. It was concluded that the intimate correlation between the chemical structures and retention indices became clearer by this method.View full abstractDownload PDF (519K) -
Saburo Matsukawa, Yasuko Shima, Harumi Morooka, Miki Ishihara1988 Volume 44 Issue 10 Pages 497-501
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe hydrophilic polyester fabrics were prepared (by the chemical treatment) to investigate the effects of the hydrophilic nature of the constituent fibers on the warmth retention of the wetted fabrics. By comparing the thermal insulation of the hydrophilic polyester fabrics with untreated ones, it was found that the warm air in the space between the skin and clothing was cooled through the pores filled with water across the fabrics. For the purpose of this experiment, the thermal insulation tester (ASTM-type, Toyoseiki Co., Ltd.) was improved to detect the changes in thermal insulation of the fabrics by wetting.View full abstractDownload PDF (756K) -
PART 1 DYNAMIC MEASUREMENT OF THE DISTRIBUTIONS OF THE CLOTHING PRESSURESHiroko Shimizu, Utako Totsuka, Yoshio Shimizu1988 Volume 44 Issue 10 Pages 502-510
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSWe have developed a dynamic system which is designed to measure the clothing pressures distributed on the body. The dynamic system is to dynamically measure the clothing pressures on the body at multi-spotted sensors on a given part of the body. By using this system, we dynamically measured the distributions of the clothing pressures on the knee as well as on the hip during the period when the subject in basic slacks was performing some kinds of motions. The motions the subject was asked to repeat were: (1) bringing up and down a leg on a block, (2) stepping up and down on a block, (3) sitting on the chair and standing up, and (4) squatting and standing up.
As a result of this experiment, we obtained following findings.
(A) When the motion starts from a standing posture, the dynamic clothing pressures reach their peak before the motions finish. When the motion ends and the body comes to a still condition, the clothing pressures grow lower and indicate a constant value. But when the body starts moving again to return to the standing posture, the pressures once grow higher and go to zero value after reaching the peak.
(B) The clothing pressures varied from motion to motion. The maximum values of the clothing pressures came out in the following order: (4) squatting and standing up, (3) sitting on the chair and standing up, (2) stepping up and down a block, (1) bringing up and down a leg on a block. (1) and (2) show almost the same values. The pressures on the knee show much greater than those on the hip. This can be because these pressures depend on the degree of skin stretching motion and of its curvature.
(C) The pressures become greater when the hem of the slacks is taped around the ankle not prevent from shifting upward than in a natural condition.
(D) The pressures show different distribution patterns both on the knee and hip. As a general rule, the pressures on the inside of the upper part and the outside of the lower part of the knee show greater value than the other parts. When it comes to the hip, the lower part and the middle part of the hip indicate greater than the other parts.
(E) From all the findings listed above, it is clear that our dynamic system can serve effectively for measuring the clothing pressures in the dynamic method. Consequently, we assume that it would be helpful to apply this kind of dynamic system into the research of the clothing pressures.View full abstractDownload PDF (748K) -
Sukenori Shintaku, Takashi Yamamoto, Toshiyasu Kinari1988 Volume 44 Issue 10 Pages 511-516
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSA two-for-one twister has many advantages of high productivity and fast operation. However, it is said that the twister of this type imposes high tension on the filament twisted. We studied factors affecting tension during twisting by two-for-one twisters. The results are;
(1) Twisting tension T0 can be expressed by the following equation. gf/den where dm is the nominal denier, ε is the twist contraction, ω is the angular velocities of the spindle, b is the radius of the upper edge of conical spindle disk, and l/b is obtained from the relation among air-drag (K), linear density (m) and radius of spindle disk (b).
(2) Twisting tension increases in proportion to square of the revolution velocity of spindle.
(3) The yarn of large linear density is subjected to high twisting tension because of large l/b.
(4) When ε increases with the twist number, the yarn tension increases because of increase in linear density of the ballooned yarn.
(5) The storage disc automatically controls the taking off point of the yarn close to the upper edge of the disc.View full abstractDownload PDF (419K) -
Sadao Hayashi, Tomoji Kurisawa, Toshihiro Hirai, Morio Murayama1988 Volume 44 Issue 10 Pages 517-526
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe geometrical patterns formed by superposing the same two figures of dots arranged at points of intersection of square fretwork have been investigated by using a personal computer. The number of patterns became innumerable by changing a rotation angle between the two figures, and none of the patterns were the same. If the dots overlapped on the two dot figures are found by a rotation at an origin, the straight line that links the origin with the overlapped dots forms a side of a square fundamental unit of a pattern. Since the straight line bisects the rotation angle (θ), the relation between the θ and the overlapped dots is defined by an important equation, tan (θ/2)=m/n. If the integral number, which is indicated by a multiple of a dot pitch, is adopted for m and n, every pattern at the θ settled by the m and the n consists of a square fundamental unit of its own. The number of the patterns with the fundamental unit was found to be above 300 at the condition of m≤20 and n≤50. These patterns will be useful as printing patterns for cloths.View full abstractDownload PDF (983K) -
LADO BENISEK, [in Japanese]1988 Volume 44 Issue 10 Pages P364-P368
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
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YOSHIHARU NAKAMURA, TERUO HORI1988 Volume 44 Issue 10 Pages P369-P373
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
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HIROYUKI FUJIWARA1988 Volume 44 Issue 10 Pages P374-P378
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
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By Stripping Off ScalesHIROSHI HOJO1988 Volume 44 Issue 10 Pages P379-P383
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
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OSAMU YUGE1988 Volume 44 Issue 10 Pages P384-P388
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
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JUNICHI ARAI1988 Volume 44 Issue 10 Pages P389-P393
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
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SHIGENOBU KAWASHIMA1988 Volume 44 Issue 10 Pages P394-P397
Published: October 10, 1988
Released on J-STAGE: November 28, 2008
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