All issues
Successor
Volume 14, Issue 2
Displaying 1-11 of 11 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1958 Volume 14 Issue 2 Pages 67-69
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (309K) -
(II) SPINNING POWER OF TEXTILE MATERIALAkira Ikeda, Iju Okano1958 Volume 14 Issue 2 Pages 70-73
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIt is evident that the spinning yarn composed of fibers is formed by the cohesion of fibers. Therefore, on an assumption the limited twist angle that measures the spinning power of the fiber is derived from the fomulas of lateral pressure, and it is shown as follows:
Where, μ is coeficient of friction between fibers, C is the thickness of fiber and Lr is the representative staple length. Futhermore, from the above equation, the experimental formula of spinning value can be derived, and the spinning values of cotton and viscose staple fiber can be calculated.View full abstractDownload PDF (264K) -
(IV) THEORETICAL AND EXPERIMENTAL STUDIES ON THE SLIP OF THE YARNEiichi Kuze, Keijiro Hyodo, Tetsuya Sakai1958 Volume 14 Issue 2 Pages 74-77
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe slip of the yarn on the pirn is generally analyzed. Slip or not is determined by the following equation: where μ: Coefficient of friction
Special attention is paid to the turn back points of traverse motion, and the possilibity of winding is subject to the yarn slips at these points. The traverse limit may be caluculated for example.
2A: Traverse length r: Radius of the pirnView full abstractDownload PDF (273K) -
(V) ON THE RELATIONSHIP BETWEEN THE BENDING BEHAVIOURS OF FABRICS AND FABRIC STRUCTURESYukichi Go, Akira Shinohara, Fusae Matsuhashi1958 Volume 14 Issue 2 Pages 78-83
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe flexible rigidities (EI) of the many kinds of fabrics (Table 1) are measured by heart loop method.
(1) EI of fabric depends upon the bending mode of test piece. An EI of fabric having the long floats on its surface is smaller in face-to-face bending than back-to-back. (Fig. 1 & 2)
(2) An EI of low freeness fabric is generally small, but there are many deviations from this tendency, e. g. in basket weaves.
(3) An effect of crimp of component yarn of fabric to the EI of fabrics is generally small. When the crimp is of sine wave, apparent rigidity Da is: Where σ: a/b π, a: amplitude, b: the length of period. So, in the case of σ_??_1 a crimp efiect is very small and neglegible, ordinary fabrics are in this category.
(4) The flexible rigidity of yarn calculated by means of dividing the fabric rigidity with yarn density EI (F) are generally larger than the true rigidity EI (T) of compornent yarn measured by the experiment.
The rigidity factor S may can be descriced in general as;
where l is true length contributing to yarn bending. In the ordinary fabrics, warp and weft yarns come in contract each other not at geometrical contact point but in contact length. So, true length l is shorter than in the case of ideal geometrical fabric model, i. e. l0=nl.
i.e. S is proportional to n, n3 EI(T)=EI(F).
In the ordinal clothing fabrics, n=1_??_1.16 (Table 3 & 4)
We find that the bending mechanism of fabrics could be explained as the function of the rigidity of compornent yarn and fabric structure.View full abstractDownload PDF (434K) -
(VII) ON THE COMPARISON BETWEEN NH3 AND Ca BASE PROCESS FOR PED PINEYoshitaka Ogiwara1958 Volume 14 Issue 2 Pages 84-91
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSTo investigate the manufacture of dissolving pulp from red pine by NH3 base SP process, some comparisons between NH3 and Ca base cookings are made. The results may be summerized as follows:
1. Under the same cooking conditions, the results of cookings by NH3 base process differ considerably from those by Ca base process. The NH3 base process gives lower yield of knots and higher yield of pulps, and its observed cooking velocity seems smaller than that of Ca base. (Fig.1)
2. Ca base process with larger amount of combined acid or lower cooking temperature than, those of NH3 base cooking gives almost the same results as NH3 base in specific knot (knot×100/pulp) and the amount of SO2 consummed. But in this case, to obtain the same yield of pulp by both processes, Ca base needs longer cooking time. Hence the practical cooking velocity of NH3 base is larger than that of Ca base. (Fig. 2, 3)
3. In case of NH3 base process, the degree of increase in specific knot by shortening the penetrating time of the cooking liquor is smaller than that in case of Ca base. It may be said that NH3 base with shorter penetrating time the same cooking results as that by Ca base. (Fig.2) is obtainable.
4. The qualities of pulps obtained by both processes are almost the same in unbleached and bleached conditions at the same yield, except of slightly higher value in α-cellulose of unbleached and α-and β-cellulose of bleached pulps by NH3 base. Pulps of both processes are not distingushable in bleaching process. (Fig. 4-14)
From the above, it is concluded that the manufacture of dissolving pulp by NH3 base process is promising.View full abstractDownload PDF (546K) -
(XVI) THE PHYSICAL PROPERTIES OF THE HEAT TREATED PAPERIsamu Yoshino1958 Volume 14 Issue 2 Pages 92-95
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSWhen paper is subjected to heat treatment at 180_??_200°C., the wet strength is remarkably increased, and other physical properties also change. In process of heating, the dry tensile and burst strength is increased and the tear strength reduced. The elongation of the wet paper is greater with prolonged heat treatment, but the irreversible elongation is increased only at the initial period of heating, and soon becomes almost constant. In comparison with the untreated paper, the dynamic Young's modulus of the heat treated paper is scarcely increased in dry condition, but is more or less increased in wet condition. The determination of the impact strength and the moisture expansivity show that the heat treated paper is very insensitive to the influence of water and moisture. The electrical puncture voltage of paper is increased and the power factor of it decreased with the time of heat treatment.View full abstractDownload PDF (311K) -
(III) ON THE MIGRATION OF THE BATH SOLIDS DURING THE PRE-DRYINGShuzo Yokoyama1958 Volume 14 Issue 2 Pages 96-99
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSAt the resin finishing of cellulosic fabrics by the precondensates of thermosetting resin, it is well-known that the migration of bath solids occurs during the pre-drying and consequently gives a remarkable effect to the resin distribution. However, there is hardly any literature which shows concretely how the migration of solids proceeds.
The author has studied this problem and obtained the result that the bath solids migrate only in the initial stage of pre-dring.View full abstractDownload PDF (329K) -
(I) POLYMERISATION OF MFTHYL ACRYLATE IN ALLYLATED CELLULOSIC FIBERSHiroaki Tonami1958 Volume 14 Issue 2 Pages 100-105
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe new process, imparting wrinkle resistance to cotton and viscose rayon fabrics by the formation of cross linkage made from methyl acrylate resin within fibers, has been experimented. The process used for this purpose consists of two steps: first, allylation of cellulosic fibers by NaOH-allyl bromide treatment, and second, polymerisation of methyl acrylate monomer in theallylated fibers.
The formation of cross linkage was assured by insolubility in Schweizer's reagent and characteristics of stress-strain properties in dry and wet states.
The treated fabrics had good wrinkle recovery, but their breaking strength was considerably decreased.View full abstractDownload PDF (500K) -
(PART 2) THE INFLUENCES OF H2O2 CONCENTRATION, TIME AND TEMPERATURE ON YIELD OF POLYMERSetsuzo Yamada, Hiroshi Kojima1958 Volume 14 Issue 2 Pages 106-110
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn the previous paper, we observed that some physical properties of spun rayon fabric had improved by intra-fiber polymerization of monomeric CH2CHCOOH. Here, in order to fined favorable conditions to polymerize monomeric CH2CHCOOH in open glass vessel with good yield of polymer in circulating hot air oven, the following tests were made.
1. Effects of concentrations of monomeric CH2CHCOOH (0.76_??_2.68mol/l), catalytic H2O2 (1.47_??_36.9×10-2mol/l), and polymerizing temperature (80_??_120°C) on the yield of polymeric CH2CHCOOH.
2. How many parts of monomeric CH2CHCOOH is evaporated and polymrized during the heating.
3. How many parts of H2O2 is decomposed during the heating.
The results obtained are:
1. Considering that CH2CHCOOH are polymerized intra-fiber with 0.76_??_2.68mol/l concentrations, at least 7.36×10-2mol/l of H2O2 and 60minutes heating at 110°C are favourable.
2. There are considerable differences in polymer yields between polymerizing at temperature 80°C_??_110°C, but only small difference is noted at 100_??_120°C.
3. Excess H2O2 concentration over 7.36×10-2mol/l is only less effectiveon polymer yield.
4. Polymelizing duration is almost not affected by monomer conentration.
5. The thinner the solution the larger is the evaporating loss.
6. The decomposition of H2O2 is not so large up to 30minutes, but rapid decomposition takes place thereafter and the thinner the monomer solution the quicker decomposition takes place.View full abstractDownload PDF (414K) -
Fujio Bekku, Noboru Azuma, Tokuko Ito1958 Volume 14 Issue 2 Pages 111-116
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIt was found that twist set of wool fibers bundle was a convenient method for determining set of wool fibers which is an important theme of study on sets of wool fabric. This method gives reproducible values to measuring sets of wool fibers under small deformations which correspond better to deformations of wool fibers in wool fabrics than a conventional method which determines sets under larger deformations like thirty percent or more stretches.
The relation illustrated in equation (I) was found, when temperature of set treatment was constant, between t, time of heating in treating bath, and S, set of wool fiber which was stable in water at normal temperature.
where both k and α are constants of positive numbers. With S, the function of T the temperature of set treatment it may be expressed by furthermore
where both n and γ are also constants. These constants under various conditions were discussed.
The effects of pH values of treating baths to set S are divided into following three divisions;
(a) Acidic region below 2.8 of pH value gives remarkable effects to sets of wool fibers,
(b) Region which makes sets depend scareely on pH values, and
(c) Alkaline region gives remarkable effects to set.
By increasing temperature of treating bath, region (b) tends to diminish and transfers gradually to region (c).
The effect of numbers of twists, that is degree of deformation, on sets appears at the lower treating bath temperature.
Results obtained from these experiments show that they have same tendencies as experiment made on sets of the worsted yarns and worsted fabrics.View full abstractDownload PDF (1256K) -
[in Japanese]1958 Volume 14 Issue 2 Pages 117-120
Published: February 10, 1958
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (319K)
- |<
- <
- 1
- >
- >|