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Volume 33, Issue 2
Displaying 1-11 of 11 articles from this issue
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JUNZO NOGUCHI, NORIO NISHI1977 Volume 33 Issue 2 Pages P39-P44
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
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YOSHIHARU TSUJITA1977 Volume 33 Issue 2 Pages P45-P54
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
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Toshinari Nakajima, Hiromi Gocho, Shigeo Nakamura1977 Volume 33 Issue 2 Pages T45-T49
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSEquilibrium water sorption isotherms were obtained for ethylene-vinyl alcohol copolymers (EVA) with a wide variety of hydroxyl contents to examine the sorptive capacity of EVA polymers as a function of hydroxyl content. The state of water molecules sorbed by EVA was investigated using the clustering function.
The larger was the hydroxyl content of EVA, the higher was the sorptive affinity toward water. The molar ratio of water sorbed to hydroxyl content varied linearly with hydroxyl content over the whole range of relative humidity studied. The BET sorption mechanism was obeyed by this EVA-water system in the relative humidities ranging from about 20 to 44%.
At low humidities, the clustering function was larger than -1 for each EVA. This indicates that there is a tendency for water molecules to cluster in these polymers. The clustering function showed a minimum at about 30% relative humidity where the amount of water sorbed by EVA is equal to that required for monolayer to be formed.View full abstractDownload PDF (296K) -
Tsunetaka Matsumoto, Katsuhiko Nakamae, Tsukasa Ochiumi, Seigi Kawarai ...1977 Volume 33 Issue 2 Pages T49-T55
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn the previous paper, it was pointed out that in some EVA (Ethylene-vinyl alcohol copolymers) specimen, especially 36.6 mole % vinyl alcohol EVA had a higher ethylene content in the crystalline region rather than that of over-all region.
In this paper, in order to clear the relationship between the mechanical properties and the microstructures of EVA, the stress-strain and stress-relaxation behaviour and the dynamic mechanical properties were studied.
The following results were obtained: (1) The glass transition temperature and the loss modulus (E″) main peak's temperature of EVA sample which contained 36.6 mole % VA, were higher than those assumed from the copolymer's given composition. (2) The apparent activation energy of mechanical relaxation of the sample mentioned in (1) was 10_??_20 kcal/mole higher than that observed in other copolymers having almost the same over-all copolymer composition. (3) The VA component in the amorphous region and the crystal perfectness affected to the modulus in the leather region.
From these results, it may be conclude that even if the over-all copolymer composition of EVA samples are almost same, their mechanical properties are different from each other because of the difference in the VA content and the microstructure of both crystalline and amorphous regions.View full abstractDownload PDF (438K) -
SOLVRON; its a Functional FiberMITSUTAKA UZUMAKI1977 Volume 33 Issue 2 Pages P55-P62
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
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Masataka Yamaguchi, Saeko Yamaguchi, Yasuko Nishimura1977 Volume 33 Issue 2 Pages T56-T63
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe authors took an accurate measurement of neck-line which was needed to make the basic pattern by the somatotype or the silhouette and provided some basic data for pattern making.
It was founded the properties of the intersectional line between bodice and neck under several conditions. For example, the neck inclination, the neck position, or the cross section of the neck.
We also found that the cross section of the neck and its neck-line could be represented approximately by combining together two kinds of semi-ellipse.View full abstractDownload PDF (1520K) -
Koichi Tanno, Fujio Takahashi, Sadao Kikuta1977 Volume 33 Issue 2 Pages T63-T71
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSMelt spinning method for the direct manufacture of metallic fibres and filaments from molten metal is more economical and more mass-productive than bundle drawing method or Taylor method. Its application, however, has the problems in finding out suitable materials for orifices and crucibles, in working orifices, and in grasping the condition of the ejected stream of molten metal. Therefore, there are few research reports on this method.
B. Lux reports that the melt spinning method in which a nozzle is used is inadequate for manufacturing fibres of less than 100μm in diameter. But in this method stainless orifices of 100μm in thickness is used, so as to decrease the resistance against the ejected stream through the orifices, and it easily manufactures the fibres of less than 100μm in diameter in the experiment in which molten tin is used. As the diameter of the orifice grows smaller and smaller, fibres with a smoother surface are obtained. Under the present experimental condition where the ejection temperature is 300°C, the longest fibre, of 23μm in diameter and of 347cm in length, is obtained.View full abstractDownload PDF (2958K) -
Shozo Iida1977 Volume 33 Issue 2 Pages T71-T77
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe stress at several finite drawing rates has been investigated from the point of plastic flow in the amorphous phase induced by deformation.
From the consideration of Bingham flow the stress was described as where σc, F: critical stress, η(T, R, Mf): viscosity as a function of temperature T, drawing rate R and molecular weight of amorphous chain derived from folded chain crystals, α: draw ratio during ultra draw, and αm: maximum draw ratio at completely extended state.
The stress-draw ratio relations of various polyethylene were determined at the temperature from 30 to 110°C and at the drawing rate from 1 to 1000mm/min. It was found for linear polyethylene that the stress increases with the drawing rate, being coincided with above equations in most drawing conditions. However, at high temperature and at low drawing rate, the stress-draw ratio relation did not agree these equations because the deformation is conducted not only by plastic flow but also by liquid flow. On the other hand the stressdraw ratio relation of crosslinked polyethylene conforms to the equation of FT type deformation in all drawing conditions. The law of time (drawing rate)-temperature reducibility is able to be applied to the stress increased by the friction of plastic flow, and the viscosity was revealed to follow the WLF equation.View full abstractDownload PDF (455K) -
Masataka Yamaguchi, Katsuo Takagi, Makio Shibaguchi, Tadashi Ohkubo, S ...1977 Volume 33 Issue 2 Pages T78-T82
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe authors have devised a new converter which cuts tow coiled along the spindle by means of a revolving circular plate cutter. This pilot converter was designed to make slivers for cotton spinning system. Calculations were made on the effect of changes in tension of the tow being fed, changes in spindle diameter and tow diameter, upon staple length.View full abstractDownload PDF (1014K) -
Noriko Choji, Mikio Karasawa, Hitoshi Nagasawa1977 Volume 33 Issue 2 Pages T83-T86
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSWhen a penetrant is desorbed from the sheet having initial concentration distribution which is obtained by absorption controlled by a constant diffusion coefficient D, the concentration C at distance x is given by
where h is the half-thickness of the sheet, C0 the surface concentration for absorption, D and t are the diffusion coefficient and time for absorption, D′ and t′ those for desorption, respectively. The total desorption amount at time t′ is derived from integrating eq (1).
P-aminoazobenzene was desorbed by means of sublimation from the nylon 6 film roll dyed with it. It was confirmed that the concentration distributions remaining and the desorption amounts in this system obey eq (1) and its derivative.
A method for estimation of diffusion coefficient D′ by the desorption amounts is proposed.View full abstractDownload PDF (216K) -
Tomoko Goto, Masamitsu Nagano1977 Volume 33 Issue 2 Pages T87-T89
Published: February 10, 1977
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSTransmission electron microscopic observations have been done using a 1000KV electron microscope on the copper filaments produced by the method of glass coated melt spinning. Dislocation tangles, dislocation loops and twins were observed in the copper filaments spun at various winding speeds. The density of dislocation tangles became homogeneous and higher with increasing the speed of winding. The high tensile strength, 150kg/mm2, of the copper filaments spun at a winding speed of more than 200m/min may result from the high density of dislocation tangles where many slip dislocations are trapped.View full abstractDownload PDF (1370K)
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