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Volume 11, Issue 12
Displaying 1-13 of 13 articles from this issue
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Sadataka Mukoyama1955 Volume 11 Issue 12 Pages 772-781
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
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(IV). THE MECHANICAL BEHAVIOUR FOR THE CYCLIC STRETCHING AND RECOVERY IN THE BUFFER SOLUTIONS OF VARIOUS PH VALUESSaburo Okajima, Sakio Ikeda, Hiromi Okamoto1955 Volume 11 Issue 12 Pages 782-787
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe mechanical behaviour of an Angora rabbit hair in the acidic buffer solutions was studied by means of the methods described in the preceding paper and the following facts are observed:
(1) When a stretching and recovery is repeated after a relaxation for 5min. after each cyclic operation, the 30% stretching work decreases with the number of the cycles.
(2) This decrement is slightest at the isoelectric point, 4.5 and it appears to increase as the medium becomes more acidic or more alkaline, but the magnitude of the work itself decreases at the same time, and consequently the decrement is also slight and the work becomes nearly constant after 2 or 3 cycles at pH 1.1 and 1.9.
(3) The 30% stretching work in the air decreases most significantly.
(4) The work of recovery is nearly constant and does not change by the cycling. Its value is also maximum at the isoelectric point, and minimum in the air.
(5) The hysteresis is largest in the air and decreases remarkably after the first stretching. In the water it is also a function of pH and the relation is similar to that of the stretching work.
(6) The resilience, the ratio of the work of recovery to that of stretching, is on the contrary, larger at the lower pH value and is at minimum in the air.
(7) The work of stretching which is decreased by 3 or more cyclic operations, as described above, partly recovers when the hair is relaxed in the water for 24hrs. The effect is most significant in the case of the hair which has been stretched in the air.
(8) The work at 50°C is less than that at 30°C. This temperature effect grows larger as pH of the medium approaches the isoelectric point of the hair.
These phenomena are explained from the view point of the folding and unfolding of the keratin molecules.View full abstractDownload PDF (500K) -
(9). MICROSCOPIC OBSERVATIONS AND DYEING PROPERTIES OF THE FINE STRUCTURE OF SILK FIBROINMasayoshi Nakanishi1955 Volume 11 Issue 12 Pages 788-793
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSExamination of the mechanism of dissolution of silk fibroin in dilute alkali and dilute acid solution has shown the following:
(1) In the structural unit of silk fibroin, namely brin, there are a micell unit, composed of subcrystalline and crystalline regions, and a fibril unit of micell unit.
(2) The fibrillae run parallel to fibre-axis, and are crowded in the interior, but at places are in disorder.
Amorphous regions II exists chiefly among the fibrillae and the surface of brin is chiefly covered with amorphous region I.View full abstractDownload PDF (2039K) -
(XX). STRUCTURAL VISCOSITY AND SPINABILITY OF THE DI-METHYL FORMIDE CONCENTRATED SOLUTION OF POLYACRYLONITRILEMasamichi Katayama, Kenji Sakaba1955 Volume 11 Issue 12 Pages 793-795
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe relationship between structural viscosity and spinability of the di-methyl formamide concentrated solution (6_??_19%) of polyacrylonitrile (_??_=550, 1400, 3250) was examined and the following results were obtained.
(1) The solution shows the structural viscosity and it resembles the P. V. A-H2O solution.
(2) Spinability by the prolong of solution is an indication for the good spinning.View full abstractDownload PDF (261K) -
1955 Volume 11 Issue 12 Pages 795
Published: 1955
Released on J-STAGE: November 28, 2008
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(III). CONCERNING THE DEFECTS APPEARED ON THE FINISHED GOODSHosaku Uchida, Yukihiro Watanabe, Masayoshi Mihara1955 Volume 11 Issue 12 Pages 796-801
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn this report (III), we studied the defects appeared on the finished goods. The observation of defects is made by naked eyes. S. U. M. P. method, and microscopical sectional view as in report (II). The results may be summerized as follows.
(1) The defects take place more easily in finished goods than in grey fabrics.
(2) The stripes due to tension differences in winding and warping become visible. The clearness of the stripes is caused by the uneven adsorption of dyestoff.
(3) The clearer appearance of the defects in case of the finished fabrics compared to the grey clothes may be caused by the notable recovery of elongation of the yarns through the wet finishing processes.
(4) Few wefts unwound from the tip of a spool, inserted stripewisely by shuttle box motion between the wefts unwound from the root part of the spool, produces a weft stripe on the finished cloth. But the defect is not detectable in the case of the grey cloth.View full abstractDownload PDF (4452K) -
(IV) ON THE EFFECTS OF SILK CREPE BY TREATMENT OF ACRYLATE MONOMERS (V) RELATION OF THE RESIN FINISHING WITH THE WEAKING AND RESISTANCEAkira Kuwahara1955 Volume 11 Issue 12 Pages 802-808
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
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II. RELATION BETWEEN THE WITHDRAWAL RESISTANCES OF FABRICS THROUGH A RING-HOLE AND THEIR COMPRESSIBILITIESHosaku Uchida, Toru Takizawa, Mitsuru Kobayashi1955 Volume 11 Issue 12 Pages 808-812
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSWithdrawal resistance, in the range where the value of fullness ρ exceeds 1, may well be assumed that it is the sum of the following two components;
a, Withdrawal resistance generated at the point where the fullness of the hole is equal to 1. (F1)
b, Resistance caused by the additional side force acts on the test piece to compress it and make it possible to pass through the hole. (Fc)
On the above assumption, and by applying the well known relation between the thickness of fabrics and the measuring pressure, t=a+b/(p+c), the authors derived a theoretical expression to give the withdrawal resistance in the range where the fullness of the hole exceeds 1, as a function of the fullness ρ, coeficient of friction between the fabric and the ring-hole surface, comperssibility of the fabric, dimentional values of the ring-hole, etc. But the expression was too complex and inpractical to their purpose, so we boldly abbreviation it into the form: where Fc: withdrawal resistance caused by the compression of the specimen in a. range of ρ exceeds one Aθ: inner surface area of the ring-hole μ: coeficient of friction R: radius of the narrowest part of the hole r: radius of the curvature of the inner surface of the ring n: R/r tθcalculated thickness of the test piece under zero pressure K2′, l, m, a, b, c: constants, their value vepends upon the character of the respective test piece.
This simplified expression has shown the results that practically coincided with the experimental results obtained from their various kinds of fabrics.View full abstractDownload PDF (281K) -
Hideo Noshi1955 Volume 11 Issue 12 Pages 812-816
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThis paper treats: 1) The crease resistance of the fabric woven with amilan and viscose rayon, 2) Its changeability due to the stripe direction. The results are as follows; 1) The crease resistance reaches its maximum value until the ratio of the viscose rayon in the fabric amounts to 25%, but decrease after that limit. 2) In order to evaluate the crease resistance of a fabric, measurements should be taken in all directions, as the resistance shows marked large defference in each direction.View full abstractDownload PDF (341K) -
(I) PREPARATION OF TYROSIN RESIN (II) PROPERTY OF THE TYROSIN-PHENOL RESINNobumasa Hojo, Masao Imoto, Hideto Hirabayashi1955 Volume 11 Issue 12 Pages 816-822
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
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(I) INFLUENCE OF NITRATION TEMPERATURE AND TIME ON THE VISCOSITY OF THE SOLUTION AND THE MECHANICAL PROPERTIES OF THE FILM MADE FROM THE NITROCELLULOSE USED FOR CELLULOID (II) INFLUENCE OF THEYoshiro Matsuda1955 Volume 11 Issue 12 Pages 822-829
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
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Kazuo Watanabe1955 Volume 11 Issue 12 Pages 830-836
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
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Hideichi Matsuda1955 Volume 11 Issue 12 Pages 837-843
Published: December 10, 1955
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (493K)
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