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Volume 12, Issue 4
Displaying 1-9 of 9 articles from this issue
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Tsukumo Tomonari1956 Volume 12 Issue 4 Pages 241-244
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
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(VI) ON THE MIXED ACETALIZATION WITH NONYLALDEHYDE AND ACETALYLMONO-SULFIDE, AND NONYL-AND BENZALDEHYDENoboru Mori, Kiyoshi Sakurai, Takeshi Tanaka, Naobumi Nakamura1956 Volume 12 Issue 4 Pages 245-248
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSVinylon fibers having good elastic recovery and better resistance to heat in dry and wet conditions can he obtained by the acetalization with acetalyl-mono-sulfide before or after nonalization.
It is observed in the mixed acetalization with nonylaldehyde and acetalyl-mono-sulfide and also nonyl-and benzaldehyde that effects of such acetalization on the properties of fibers depend upon the conditions of reactionView full abstractDownload PDF (271K) -
(VI) EXISTENCE OF THE RESISTANT CRIMPS OF WOOL AND ITS BEHAVIOR DURING A STRETCHING (VII) A CONTRIBUTION TO THE STRESS-STRAIN BEHAVIOR OF FIBRE OF IRREGULAR CROSS-SECTIONAL AREASaburo Okajima, Sakio Ikeda1956 Volume 12 Issue 4 Pages 249-257
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
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(I) ACETALIZATION OF HEAT-TREATED POLYVINYL ALCOHOL FIBER WITH SEVERAL HIGHER ALDEHYDESKenichi Tanabe, Koji Ohno1956 Volume 12 Issue 4 Pages 258-264
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn order to improve the resilience of vinylon by means of introducing bulky side chains, heat-treated polyvinyl alcohol fibers are acetalized with several higher aldehydes, i.e. butyr-, iso-valeric, heptyl, lauryl, benz-and I-naphthoic aldehyde, and their properties particularly tensile recovery are examined. Their dry and wet heat resistances are somewhat inferior, their dry tenacities and elongations are approximately equal, and their wet tenacities are fairly superior to those of formalized fibers respectively, with the exception of fibers acetalized to higher degrees of acetalization with higher aldehydes. Their Young's moduli are greater and their initial elastic loads and elongations are higher than those of formalized fibers respectively, and these tendencies are particularly remarkable at benzalized fibers. The higher the aldehyde used and the greater the degree of acetalization, the higher the tensile recovery in the range of relatively low extension and inversely the lower in the range of higher extension. By benzalization the best recovery and the tensile recovery vs. extension curve similar to acetate rayon are obtained. These relationships between tensile recovery and extension seem to be explained in terms of steric hindrance due to side chains introduced to amorphous portions of the fiber. The dyeability of fibers acetalized with these higher aldehydes is very poor as compared with that of formalized fiber.View full abstractDownload PDF (544K) -
(PART VI) THE NEW METHOD OF THE BLEACH-DEGREE ESTIMATION OF THE UNBLEACHED CHEMICAL PULPS (PART VII) ON THE BLEACH-DEGREES OF THE UNBLEACHED CHEMICAL PULPS FOR THE JAPANESE HAND-CRAFT PAPERShinichi Honda, Masando Okabe1956 Volume 12 Issue 4 Pages 265-275
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
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(IV) FLOTATION OF PULP SHEETS IN COMMERCIAL PRESS STEEPINGAkira Iuchi, Toshiro Owashi, Akira Miyamoto1956 Volume 12 Issue 4 Pages 276-279
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSFlotation phenomenon of pulp sheets in commercial press steeping was investigated, and following results were obtained.
1. When pulp sheets of commercial size are steeped as sheet bundles, they contain more air per unit mass than that contained by separatedly steeped sheets. This additional air was calculated at about 1/10-1/5 of total air.
2. The degree of flotation increases with increased sheet size and with increased number of sheets per bundle. These data indicate the difficulty of penetration of steeping lye to the centre of larger sheet bundle.
3. The degree of flotation in commercial press steeping tends to decrease with increasing apparent density of pulp sheet, in general.
4. The degree of flotation is minimized at a proper lye filling speed in commercial press steeping.View full abstractDownload PDF (273K) -
(II) pH OF THE CRABBING WATER UPON THE SETTING EFFECTSaburo Okajima, Tetsuo Inoue1956 Volume 12 Issue 4 Pages 280-287
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe effect of pH of the water upon the crabbing of woolen fabric was investigated. Woolen fabrics were immersed in the water of pH of 7-10.5 for 1 hr at 50°C, which were pressed under the pressures of 0.5-4 kg/cm2 at 100°C for 5-20 min. immediately after being taken out of the water. The pressing was given to a sheet or a pile of 6 fabrics.
The lustre, Lr of these fabrics decreases, in general, to Lr′ when they are released for 10 or 20 min. in the steam of 100°C. This decrease of lustre is less the more effectively the fabric is set at the crabbing. So L′r/Lr was measured as an appraisal of the effectiveness of the crabbing and the following results were obtained.
(1) The crabbing is most effective when pH of the water is 9.2, when Lr and L′r/Lr are largest.
(2) At pH higher than 8, H2S smelled during the pressing and the samples coloured yellowish slightly, It is interesting to note this correspondency of the evolution of H2S and the effect of the crabbing from the standpoint of the mechanism of the chemical setting.View full abstractDownload PDF (1195K) -
(IV) RANKING OF VARIOUS FABRICS BY WITHDRAWAL METHOD IN COMPARISON WITH OTHER METHODSHosaku Uchida, Toru Takizawa, Mitsuru Kobayashi1956 Volume 12 Issue 4 Pages 288-293
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSVarious fabrics collected in the market and a series of spun rayon fabrics treated by various concentration of a resin solution were ranked by our Withdrawal method. These results were discussed in comparison with the results obtained from Subjective rating, Flexural Rigidity, Drape coefficient and other methods.
It was recognized that the values of Withdrawal resistance of various fabrics are (i) highly correlated to the value of their respective Flexural Rigidity and also their Drape coefficient, (ii) they give a faithful ranking to the assumed resin contents, in the case of a series of resin finished spun rayon fabrics, and (iii) they also give the same ranking of handling as that obtained by human hands of twenty experts.
In this method the measuring procedure is very simple and it gives always the same value if measured under the same conditions, and also it gives mechanical and objective results, so the authers recommend that it may be used as a practical method of measuring fabric hand.View full abstractDownload PDF (402K) -
Ko Naiki1956 Volume 12 Issue 4 Pages 294-300
Published: April 10, 1956
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDownload PDF (384K)
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