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Volume 10, Issue 2
Displaying 1-7 of 7 articles from this issue
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Kenji Higuchi, Hidetoshi Takahashi, Toshihide Hirata1964 Volume 10 Issue 2 Pages 50-58
Published: 1964
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSObjects:
1) To determine the transfer function of a roller card by means of a sampling card.
2) To investigate the optimum condition for controlling the roller card by a closed loop control system.
Methods:
1) The outline of this system is assumed from transient response in step input. Its time constant is obtained from the variance of output web produced by creating rectangular wave input with periodic revolutions of the feed roller.
2) The optimum value of the controllers is obtained by taking the unevenness of output card web as a stationary Gaussian noise.
Findings:
1) The transfer function of the roller card is a linear first-order control system with a dead time.
2) P1D control is best suited to a system with a long dead time, such as a roller card.
3) PD control works better than P or PI.View full abstractDownload PDF (1027K) -
Part 4: Experimental ResultsM. Uno, A. Shiomi, M. Haruta, I. Hayashi1964 Volume 10 Issue 2 Pages 59-64
Published: 1964
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe degree of fiber orientation of slivers (D.O.) was measured with the optical apparatus previously referred to and the results were compared with those obtained with other testing methods. Findings:
1) As the process of cotton spinning progresses, the D.O. is improved, but the rate of its increase decreases.
2) Generally, the longer the staple length, the better the D.O.
3) Periodic irregularity having a period of 68cm. is noticed in ordinary cotton slivers, presumably because of sliver-coiling in the can.
4) D.O. in worsted spinning is not improved as much as one would expect when one thinks of its long series of processes.
5) There is a good correlation between the results obtained by the measuring method studied here in and the results obtained by other optical testing methods. Our testing procedure has a good correlation even to the Lindsley method if the same kind of fiber is tested. Testing different kinds of fibers may show results opposite to those obtainable by the Lindsley method.View full abstractDownload PDF (722K) -
Part 7: Lateral Swelling of Twisted YarnIchiro Genma, Yasuji Fukushima1964 Volume 10 Issue 2 Pages 65-71
Published: 1964
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSPart 7 of this article deals with the cross-sectional swelling of twisted yarns when they are wetted. Part 8 deals with some tensile properties of textile fibers in water under certain conditions equivalent to twist set conditions for crepe yarns.
Part 7 concludes (1) that the cross-sectional swelling S of nylon, Terylene and acetate twisted yarns is almost negligible, but that S of viscose rayon and silk twisted yarns is influenced by yarn structure and decrease as twist increases; and that (2) S for viscose rayon twisted yarn is determined by the lateral compression acting on the neutral layer formed in the yarn during twisting, independently of yarn twist or count.View full abstractDownload PDF (791K) -
Part 8: Effects of Strain Setting Process on the Tensile Properties of Some Textile Fibers.Ichiro Genma, Yasuji Fukushima1964 Volume 10 Issue 2 Pages 72-79
Published: 1964
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSPart 8 concludes (1) that the contraction force f1 develops in set fibers immersed in water and is in proportion to the strain set previously, f1 as a general form being expressible as f1=E1 (ε-εn), where E1 is a material constant, ε is the strain set previously and εn is a limit strain beyond which f1 shows; (2) that the amount of yarn contraction also increases linearly with the strain set previously, (3) and that initial Young's modulus E2 of set fibers, obtained by further stretching in water after f1 has developed, increases linearly with strain ε, and E2 for viscose yarn, acetate and silk is expressed as E2=K+kε where K and k are material constants.View full abstractDownload PDF (954K) -
Tadashi Fujita1964 Volume 10 Issue 2 Pages 80-83
Published: 1964
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSMany of the published works on how to interlace dice checked sateen seem incomplete to the present author, who holds that the characteristics of the interlacing of perfect dice checked sateen are obtainable by multiplying matrices.
If a matrix on perfect checked sateen, with the elements of the matrix indicated by the interlacing marks of warp sateen, is multiplied on the right by a transposed matrix of the matrix whose elements are indicated by the interlacing marks of weft sateen, then the elements of the matrix of the product Aik(i+k=n+1) are all zero, if the marks of weft up are represented by zero. The interlacing marks of dice checked sateen make a symmetric point in relation to the center of one repeat of a design.View full abstractDownload PDF (477K) -
K. Yamaki1964 Volume 10 Issue 2 Pages 84-86
Published: 1964
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe purpose of this article is to induce a general formula on factors limiting the length of the guide paths in a braiding machine, to discuss these factors in detail and to draw a diagram for general use.
1) For stripe braiding machines, an angle α between two central lines connecting the centers of horn gears, having radius x y, and z, is expressed as follows.
Sin-1{-2z√<x2+2xz>/(x+z)2}>α>sin-1{-4√<xyz(x+y+z)(x2+xy-yz+zx)>/(x+y)2(x+z)2}
2) When x=y=z=mr, the relation among α, n (number of horns measured along a carrier path) and m (number of horns of a horn gear) is induced as n=m(2α-π).View full abstractDownload PDF (293K) -
Part 1: Foreseeing the Chromaticity of Mixed Colors in Various Types of YarnsTadasu Sanuki, Masayuki Naruse1964 Volume 10 Issue 2 Pages 87-92
Published: 1964
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSHere is a report of the results of a colorimetric study as to the effects of color mixture in woven fabrics. The samples used in our experiment were sprinkly colored yarns, grandrelle yarns and plain-dyed yarns arranged abreast. We investigated how to foresee the chromaticity of the mixed color of each of these materials from the tristimulus values of each of the colors to be mixed in the fibers composing the yarns.
We obtained the following empirical formulas by which the tristimulus values of the mixed color can be foreseen: X12=(1-FX)(aX1+bX2) Y12=(1-FY)(aY1+bY2) Z12=(1-FZ)(aZ1+bZ2)} ……(1) where X1, Y1 Z1 and X2 Y2, Z2 are the tristimulus values of two colors to be mixed, and a and b are constants to be fixed by the ratio of colors to be mixed.
FX, FY, and FZ in these formulas, which we call deviation coefficients, can be experimentally fixed by the way of mixing colors, the number of twists and the degree of hairiness, if all the other conditions are constant.View full abstractDownload PDF (627K)
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