Sen'i Gakkaishi

COMPRESSIONAL RESILIENCE OF BLANKETS AND CARDED FIBRE MASS

(II) DISCUSSION ON COMPRESSIONAL RECOVERY

Tatsuki Matsuo

1960 Volume 16 Issue 12 Pages 1009-1013
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1009

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In the previous report, the compressional pressure-deformation curves of various carded fibre masses and blankets were measured. And they were analysed by the model which consists of m springs in series and the n serial springs in parallel, where n and m depend on deformation x. In this report, considering the rheological character of bended fibres and the frictions between them, the compressional recovery is discussed. It is defined as
The result of analysis of pressure deformation curve drives the following equation, where n₁ and n₂ are n and k₁ and k₂ are k in 1st and 2nd compression respectively, and θ_??_2 or 3. k is the coefficient of bending fibre's rigidity. The entanglements of fibres in the 1st compression cause the increase of n, from n₁ to n₂. Assuming a relation between the mean bending force of the fibres and the forces of entanglement points, the number of entanglements in the 1st compression is related to the rheological properties of bending fibres and the distribution of maximum entanglement forces which correspond to static friction force ceofficient.

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STUDIES ON RABBIT FIBRES

(XXXVIII). A TENTATIVE TREATMENT ON SHIFTING FACTORS OF ANIMAL FIBRE

Sakio Ikeda

1960 Volume 16 Issue 12 Pages 1014-1019
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1014

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A calculating method of shifting probability (S) towards the root of animal fibre than towards the tip was studied. It could be calculated easily from _??__a, _??__w, σ_a² and σ_w², where _??__a and _??__w are mean values of coefficients of friction of anti- and with-scale, and σ_a² and σ_w² are unbiased valiances of μ_a and μ_w.
The following relations are discussed;
between _??__a and σ_a, _??__w and σ_w,
(μ_a-μ_w) and (μ_a-μ_w)/μ_w,
(μ_a-μ_w)/μ_w and (μ_a-μ_w)/(μ_a+μ_w),
S and (μ_a-μ_w)
and S and (μ_a-μ_w)/μ_w.

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STUDIES ON THE FIBROUS ACETYLATION OF COTTON

I. ACETYLATION OF COTTON FABRIC BY THE LIQUID PHASE METHOD

Waichiro Tsuji, Ryozo Kitamaru, Yasuyoshi Sakaguchi

1960 Volume 16 Issue 12 Pages 1020-1026
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1020

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Cotton fabrics were acetylated up to a wide degree of substitution by the liquid phase method as reported in this journal (1957) by Sakurada and Sakaguchi. In the present study tensile properties of the fabrics were examined before and after acetylation and it was found that under proper conditions the cotton fabric could be acetylated up to high degree by the liquid phase method without lowering the tensile strength.
The preparation method of acetylation bath and its stability, the comparison of various catalyzers and diluents are discussed.

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STUDIES ON THE FIBROUS ACETYLATION OF COTTON

II. ACETYLATION OF COTTON FABRIC BY THE SEMI-LIQUID PHASE METHOD (SO-CALLED PADDING METHOD)

Waichiro Tsuji, Ryozo Kitamaru, Yasuyoshi Sakaguchi, Fujiko Kimura

1960 Volume 16 Issue 12 Pages 1026-1031,1020
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1026

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Cotton fabrics, pretreated with acetic acid, were immersed in the acetylation bath, which consists of acetic anhydride and catalyzer, and squeezed to about 60-70% pick-up and then heated in a closed vessel. During these processes the cotton fabrics are acetylated. In this acetylation method, almost all parts of acetic anhydride contained in fabrics are consumed in the reaction and cotton fabrics are acetylated to about 30mol% without lowering the tensile strength in a very short time.
This method would be advantageously applied to an industrial continuous acetylation, because the immersion in liquid and the reaction could be finished in an extremely short time.

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STUDIES ON DIELECTRIC PROPERTIES OF ELECTRICAL INSULATING PAPER

(PART I) EFFECTS OF MONO-VALENT CATIONS ON DIELECTRIC PROPERTIES OF UN-IMPREGNATED PAPER

Yuichiro Take, Yutaka Suzuki, Ryosuke Matsunaga

1960 Volume 16 Issue 12 Pages 1032-1038
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1032

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The paper for capacitor was dried without washing with water after immersed in the aqueous solution of electrolytes, and dielectric loss and electrical resistance were measured at 100°C and 120°C.
(1) It is found that the order of mono-valent cations which influenced badly on the dielectric properties is as follows
(2) Although the order of Na⁺ and Li⁺ is reversed, this order generally agrees with Lyotrope series and the order of ion radius.
(3) It seems that the effects of anions on the dielectric properties are smaller than those of cations.
(4) When these cations contained in the paper are changed, there are no difinite relations between the dielectric loss and the water-extract conductivity.

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STUDIES ON DIELECTRIC PROPERTIES OF ELECTRICAL INSULATING PAPER

(PART II) EFFECT OF MONO-VALENT CATIONS ON DIELECTRIC PROPERTIES OF UN-IMPREGNATED PAPER

Yuichiro Take, Yutaka Suzuki, Masahiro Kitsukawa

1960 Volume 16 Issue 12 Pages 1038-1040,1032
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1038

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Effects of mono-valent cations on dielectric properties of oil-impregnated paper were studied by the same method as that of un-impregnated paper.
(1) In the range of this work, effects of mono-valent cations on the dielectric loss at low temperature (about 20°C) is not observed.
(2) It is obvious that the order of cations which influences badly on the dielectric properties of oil-impregnated paper is same as that of un-impregnated paper. The order is as follows;
(3) In order to compare the dielectric loss of oil-impregnated paper with that of un-impregnated paper, a value of tan δ_t/tanδ_u is obtained. Those values of the paper treated with NH₄-salts are by far larger than those of the paper treated with other three electrolytes.

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DYEING OF VINYLON WITH SOLACET DYES

(I) ON THE RELATION BETWEEN THE AFFINITY AND SALT CONCENTRATION IN THE DYE-BATH (II) ON THE HEAT AND ENTROPY OF DYEING

Akira Katayama, Nobuhiko Kuroki, Kenzo Konishi

1960 Volume 16 Issue 12 Pages 1041-1049
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1041

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STUDIES ON THE RESIN DISTRIBUTION AT RESIN FINISHING OF THE EABRIC USING THE RADIO ISOTOPE

(I) ON THE FUNDAMENTAL CONDITIONS OF MACROAUTORADIOGRAPHY (II) ON THE EFFECTS OF PREDRYING CONDITIONS ON THE RESIN DISTRIBUTION

Shuzo Yokoyama, Yoshiro Onti

1960 Volume 16 Issue 12 Pages 1050-1055
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1050

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[title in Japanese]

[in Japanese]

1960 Volume 16 Issue 12 Pages 1056
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1056

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[title in Japanese]

[in Japanese]

1960 Volume 16 Issue 12 Pages 1057-1067
Published: December 10, 1960
Released on J-STAGE: November 28, 2008

DOIhttps://doi.org/10.2115/fiber.16.1057

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