巻号一覧
41 巻, 1 号
選択された号の論文の15件中1～15を表示しています
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許 甲鎭, 北尾 敏男, 木村 良晴, 谷口 五十二1985 年 41 巻 1 号 p. T1-T7
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーPEEK, a poly (aryl-ether-ether-keton), was subjected to melt spinning and hot drawing to prepare a thermal resistant fiber. The temperatures of spinning and drawing were preliminary estimated from the thermal analyses for a film specimen: The DTA traces imply that Tm is 337°C, Tg 143°C, Tch (the crystallization temperature on heating) 173°C, and Tcc, (the crystallization peak on cooling) 280°C. The TGA revealed that the onset of thermal decomposition was at temperature above 400°C even in the presence of oxygen. PEEK, however, fairly colored and degraded at 400°C in the actual melt spinning. A smooth and steady spinning could be performed at 380°C. Four as-spun fibers ranging in the spin-stretch ratio from 3 to 36 were prepared for the hot drawing experiments. The maximum draw ratio slightly increased with increasing drawing temperature: It varied from 2.8 at 140°C to 3.5 at 270°C for the most highly spin-stretched fiber. Similarly the drawability was a function of the preceeding spin-stretching. The tensile properties at elevated temperatures were compared to those measured at the ambient temperature: The tensile strength was 0.29 GPa at 235°C, corresponding to 42% of that at 25°C, while more than 30% of the tensile modulus for 25°C was retained at 235°C.抄録全体を表示PDF形式でダウンロード (2150K) -
内田 盛也1985 年 41 巻 1 号 p. P3-P11
発行日: 1985/01/10
公開日: 2008/11/28
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鳥海 浩一郎, 近田 淳雄, 藤本 和士1985 年 41 巻 1 号 p. T8-T15
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーThis paper attempts to quantitatively predict the occurrence of draw resonance in water-bath quenched melt-spinning of PET under non-isothermal conditions.
An empirical criterion of stability was introduced and tested against experimental spinning results and against previous simulation results by the authors.
It was found that:
(1) When newly defined nondimensional logarithmic elongation-rate (γ) is larger than about 3, spinning becomes unstable to develop draw resonance.
(2) In the case of small Stanton number, onset of draw resonance was found to be predicted by simply using the above criterion on steady state solution of governing equations. The present prediction was in close agreement with theoretical and experimental results by previous workers.抄録全体を表示PDF形式でダウンロード (577K) -
平野 豊1985 年 41 巻 1 号 p. P12-P17
発行日: 1985/01/10
公開日: 2008/11/28
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須藤 道雄, 市原 祥次1985 年 41 巻 1 号 p. T16-T21
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーBlown bubble tubes of high molecular weight high density polyethylene were formed using the apparatus with an inner cooling mandrel and an outer water cooling ring, and the strain rates of the blown bubble forming process were obtained. From the results, it is found that the strain rate in the flowing direction decreases in the early stage of blowing up, and then, through minimum, it increases. The minimum value of the strain rate in the flowing direction decreases with increasing take-up velocity, and it becomes negative at a take-up velocity of 10m min-1. This result shows that not only elongational viscosity, but also elasticity is important in the blown bubble process.抄録全体を表示PDF形式でダウンロード (379K) -
真鍋 征一, 上出 健二, 小松 義也1985 年 41 巻 1 号 p. P18-P26
発行日: 1985/01/10
公開日: 2008/11/28
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北尾 敏男, 中西 康之, 木村 良晴, 谷口 五十二1985 年 41 巻 1 号 p. T22-T27
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーA high density polyethylene was cast by using a flat film processor which consisted of a 25mm extruder, a 20cm coathanger die, a pair of chill rolls, and a variety of electrodes on which thin needles were regularly planted in a row at intervals of d cm. The corona shower radiated from the electrode onto the surface of the running molten film resulted in the spreading of the film width W. At first the fluctuation of the film thickness was related to d and the voltage E applied to the electrode. Then W was analyzed with respect to D and (L-H); where D is the horizontal distance between the tip of the needles and the front surface of the running film, L is the vertical distance measured from the die lips to the freezing line on the chill roll, and H is the vertical distance between the die lips and the electrode needles. The adoption of the electrodes with d≥1cm resulted in the formation of channels on the film surface, implying the existence of the fluctuation of the electric charge distribution on the film surfaces. When d was smaller than 0.5cm, however, no fluctuation in film thickness was found at any level of E. W varied inversely with d. The ultimate voltage applicable to the electrodes seemed to be limited by the dielectric strength of the atmospheric layer rather than the breakdown of the running film itself because the thickness of the latter was much smaller than that of the former in the present systems. Then the increase in D and/or (L-H) caused the increase in W the width of films.抄録全体を表示PDF形式でダウンロード (400K) -
脇田 登美司1985 年 41 巻 1 号 p. P27-P31
発行日: 1985/01/10
公開日: 2008/11/28
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北尾 敏男, 小林 謙治1985 年 41 巻 1 号 p. T28-T36
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーA series of FRTP were prepared from a commercial polypropylene and an experimental fibrous anhydrite (anhydrous gypsum), of which dimensions were 1 to 2μm thick and 50 to 100μm long. Blending experiments were conducted in accordance with the plans for a series of L27 (33) factorial experiments, where three characteristics of resultant composites, the homogeneity of the filler dispersion, tensile modulus, and tensile strength, were statistically analyzed in terms of four processing factors, the kneeder employed, the disentanglement degree of raw filler fiber, the content of filler, and the premixing procedure of raw materials. After being blended in molten state, the resultant composites were emerged through a fine capillary to form monofilaments and then cut into fine chips. Some part of these fine chips was compression-molded into thin sheets for tensile experiments and the rest was subjected to determine the density distribution. The standard deviation of the density distribution was calculated to estimate the homogeneity of the filler dispersion in the composites. The analysis of variance for these three characteristics revealed that the homogeneity of the filler dispersion was significantly affected by the kneeder employed and the filler content. The tensile modulus was influenced by the kneeder, the composition, and the premixing procedure but the tensile strength was a simple function of the filler content. In addition, a minor interaction between the kneeder and the filler content was found for the standard deviation of the density distribution of the resultant composites.抄録全体を表示PDF形式でダウンロード (609K) -
佐藤 隆三1985 年 41 巻 1 号 p. P32-P38
発行日: 1985/01/10
公開日: 2008/11/28
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渡辺 敬1985 年 41 巻 1 号 p. T37-T42
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーポリアクリロニトリル(アクリル)繊維はPenicillium notatum, Penicillium chrysogenum及びAspergillus nigerの培養により, 30°C, 30日又は4日で劣化された。
アクリル繊維の劣化はP. notatumとA. nigerの場合に顕著であった。繊維表面の侵食と繊維軸方向の裂け目が劣化の第1段階で認められた。第2段階で,この裂け目は大きくなり,繊維軸に沿っての亀裂を生じた。A. nigerの場合には,繊維の局部的侵食が拡がり,その結果亀裂をつくった。
P. chrysogenumの場合には劣化の第1及び第2段階のみが観察された。
アクリル繊維で,フィブリルの多くの集束が繊維軸方向に並んでいる集束構造が認められた。ふつうの場合,ひとつの集束の直径は約3μmであった。抄録全体を表示PDF形式でダウンロード (1873K) -
梶 光雄1985 年 41 巻 1 号 p. P39-P44
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (548K) -
石川 左武郎, 柳川 昭明, 竹下 弓子, 西尾 好子1985 年 41 巻 1 号 p. T43-T54
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーAn accurate information of instantaneous positions of walking human buttocks, if it is known, will be very useful for developing a walking simulator for the clothing research. The two-dimensional swinging motion of human buttocks when walking at an ordinary speed was measured by taking moving pictures of the testee's back. Following results were obtained.
1. The mean amplitudes of the vertical and horizontal buttocks swinging motions were about 1.72cm and 1.08cm, respectively. The tops of buttocks rotated horizontally inward and outward by an angle of ca. 2°-5° and ca. 1°-4°, respectively, about an vertical axis through the intersection point of the short and long axes of the horizontal hip cross-section.
2. An amplitude ratio λr of vertical to horizontal swinging motion of the buttock tops of various testees was dispersed between 0.8 and 2.8. An inclination angle of the line between the right and left buttock tops was also estimated to be ±7°-10°.
3. A vertically projected track of the swinging buttock tops in walking was made. It is found that each track exhibits a very complicated pattern, but some of them resemble long ellipses and the others circles.
4. From these results, gaits of the testees can be classified into two groups. One is an elliptical track, of which the long axis is perpendicular to the vertical direction or a circle, having λr<2, and the other an elliptical, of which the long axis is parallel to the vertical direction, and λr>2.抄録全体を表示PDF形式でダウンロード (750K) -
林 寿郎, 中島 章夫1985 年 41 巻 1 号 p. P45-P51
発行日: 1985/01/10
公開日: 2008/11/28
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荒谷 善夫, 安部 章三1985 年 41 巻 1 号 p. P52-P57
発行日: 1985/01/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (3322K)
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