All issues
Volume 3, Issue 2
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
-
Tadasi Zusi1957 Volume 3 Issue 2 Pages 1-8
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSWith a view to explaining the mechanical properties of yarn and fabrics, an elastic theory of twisted structure has been primarily developed.
Forces and their moments required to keep a, thread in twist depend as much upon the intrinsic latent moments which the thread has in its linear state, as upon the torsional and flexural rigidities of the thread (GIp and El).
The balanced twist of a single thread or a bundle of threads can be theoretically found out in a state where twisting exerts the least resisting moments.View full abstractDownload PDF (646K) -
Seiichi Sayama, Hidenaga Yoshimura1957 Volume 3 Issue 2 Pages 9-16
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSIt is well-known that many complicated factors rct upon the strength of spun yarn, . In this report we have made some inquiry into factors that influence yarn strength. We have measured the number of fiber slippages when spun rayon yarn and nylon-rayon blended yarn are broken.
(1) As a rule, the fiber slippage of both spun rayon and nylon-rayon blended yarns is less than 20% of the number of fibers in the yarn cross-section.
(2) Fiber slippage in crimped spun yarn is worse than in uncrimped. Crimped spun rayon is poorer in utility of strength than uncrimped. influence yarn strength.
(3) There is not always a correlation between utility of strength and fiber slippage. Clearly, therefore, all 11 factors except frictional theory
(4) Within the range of practical number of twists the coarser spun yarn is, the less fiber slippage.
(5) As the number of twists increases, fiber slippage decreases, but utility of strength attains a mix imum near the most suitable number of twists thereafter decreases.
(6) In the range of practical number of twists (about 4.5-8 turns per centimeter), the theoretical equacion introduced by Agatsuma may be applied. (Of this more later.)
(7) The above results apply to spun rayon yarn, but not to nylonrayon blended yarn.
(8) In nylon-rayon blended yarn containing less than 50% nylon, there is more slippage of nylon than of rayon. If the nylon content exceeds 50%, there is more slippage of rayon.View full abstractDownload PDF (661K) -
Shozaburo Yamaguchi1957 Volume 3 Issue 2 Pages 17-28
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSThe purpose of this study is to inquire experimentally into the general creep and recovery properties of textile fibers and to represent these properties quantitatively by some constants.
The following empirical formulas show the total elongation ε due to constant tensile stress σ during loading time t, and the total recovery shrinkage ε' due to unloading at time t' after unloading:
_??_ (1)
_??_ (2)
where EoEr b, l, m and n are constants proper to each fiber under constant conditions.
Consequently, these constants represent quantitatively the creep and recovery properties of the fibers. Cotton, wool, viscose rayon, bemberg, acetate, vinylon and nylon fibers were tested as single filaments in the experiments referred to in this article.View full abstractDownload PDF (906K) -
Muneo Suematsu1957 Volume 3 Issue 2 Pages 29-35
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSThe purpose of this article is to discuss the elastic property of knitting yarn under a small tension. I shall study the relation between the elastic property of yarn and that of wool. I advance the theory that the property of knitting yarn is represented by the density of the elastic energy per mass.
Next, I consider the problem of the distribution of the curve of the density of the elastic energy in the same sample. In this case we consider the relation between the distribution of the density of the elastic energy of knitting yarn and the distribution of the density of the elastic energy of the wool in the space of 3 dimensions.
The following are the findings:
(1) The elastic property of the knitting yarn are represented by the density of the elastic energy per mass.
(2) The distribution of the curve of the density of the elastic energy may be adjusted by the mean load of wool.
(3) The form and distribution of the curves of the density of the elastic energy of knitting yarn is determined by the surface of the set of density curves of the elastic energy of wool of which knitting yarn is made.View full abstractDownload PDF (574K) -
Haruo Sanuki, Takeshi Iwakata1957 Volume 3 Issue 2 Pages 36-41
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSThe authors submit in this article a report of their recent experiment on the degradation of cellulose in the process of dry carbonization with hydrogen chloride. The experiment was made with the use of a standard quality of cotton cloth. All the treating conditions which are considered to influence the effects of treatment were combined for examination in the course of the experiment.
We have found that each of the simple factors (the temperature for treatment, the length of time for treatment and the absolute quantity of gas) and two interactions are significant to the effects of treatment in carbonization. We have also found that there is a necessary minimum degree of temperature, and that carbonizing gives good results if there is an ample absolute quantity of gas, even if the length of time for treatment is short.
There is a curve correlatfon between the degree of change of color and the degree of degradation, but it would be wrong to judge the degree of degradation by the change of color in the carbonizing process, because it will not do to apply this correlation in practice.
When wet rags are treated at a high temperature, degradation is very effective. We think the mechanisms of degradation of cellolose in wet and dry carbonizations are similar, and that there is little difference in the effect of carbonizing treatment between wet and dry.View full abstractDownload PDF (483K) -
Kunio Aoki, Akira Aoki, Tokuichi Tanimoto, Noboru Arita1957 Volume 3 Issue 2 Pages 42-47
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSThe rotary type beater, such as the saw toothed beater of a cotton opener and picker, performs good opening action, but for effective cleaning action a special mechanism is needed.
Model D Opener of our designing is intended for effective cleaning and has given good results. In this report we describe the mechanical feature of our new opener and report the results of tests by some mills. This opener is also good for the short-cut system of opening and picking process for cotton and for the opening process for rayon.View full abstractDownload PDF (604K) -
Toshio Isshi1957 Volume 3 Issue 2 Pages 48-52
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSHitherto it has been impossible to study the bending properties of fibers, yarns or fabrics, in the absence of bending testers for these materials. The author has devised a trial apparatus which measures the bending moment acting at one end of a sample which is bent in the shape of a partial cylinder of any radius. From the measurement is obtainable a diagram showing the relation between the bending moment and the curvature of the sample.
The practical capability of this tester is shown in a few examples in this article.View full abstractDownload PDF (516K) -
Tokio Uematu, Takesi Kano, Masami Matuura, Hirosi Ogawa1957 Volume 3 Issue 2 Pages 53-60
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSThis article deals with the effects of nozzle shape on the characteristics of an atomizer used for humidity control in a textile factory.
The best dimensions of a nozzle, after economy factors are considered, are: (a) 3.2mm in nozzle tip diameter and 2mm in the length of its uniform section; (b) 1.0mm in inner diameter of water injection tube, 1.6mm in its outer diameter; (c) the best atomizing conditions for the said dimensions of a nozzle are: (1) suction lift of feed water, 35cm; (2) injection air pressure and its quantity, 26cm Hg and 1575cm3/s; drops, (3) the quantity of injection water, 0.331cm3/s; (4) mean diameter of 16 μ. The angle of opening has hardly any influence upon the characteristics of an atomizer.View full abstractDownload PDF (1201K) -
Takeshi Takeuchi1957 Volume 3 Issue 2 Pages 61-65
Published: 1957
Released on J-STAGE: July 08, 2008
JOURNAL FREE ACCESSA study of the unit moire has shown that the manufacturing methods of the unit moire can be classified into two classes. Various moire patterns obtainable are:
(1) Using no-wave rules
mT=nS or m=0 and n=0 Horizontal straight strips
S=T Vertical straight strips
m=0 or n=0 Slanting strips
(2) Using wave rules
S=T and m=0 Symmetrical vertical straight strips
S=T and m_??_0 Unsymmetrical vertical straight strips
S_??_T and m=0 Symmetrical curve strips
S_??_T and m_??_0 Unsymmetrical curve strips
where S is the inverse number of counts of weft in fabric A, and T is the inverse number of counts of weft in fabric B, m is the tangent of inclination of weft in fabric A, n is the tangent of the angle of inclination of weft in fabric B.View full abstractDownload PDF (298K)
- |<
- <
- 1
- >
- >|