Journal of the Textile Machinery Society of Japan

Viscoelastic Flow into a Slit at Low Reynolds Numbers

Part 2: Velocity Profiles

Kiyoji Nakamura, Yasuhiro Yamamoto, Fujio Nakamura, Akira Horikawa

1978 Volume 24 Issue 1 Pages 1-6
Published: 1978
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.24.1

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When melted polyethylene liquid having long relaxation time flows from a reservoir into a slit, the circulating secondary flow is observed near the slit even at low deformation velocity. In the present paper, the velocity of main flow and that of circulating secondary flow were traced with aluminium powder and the influence of the slit width and the slit length on flow behaviour was investigated. The results are as follows:
Significant difference is found between the velocity of main flow and that of circulating secondary flow, and the circulating velocity is very small. The velocity at the boundary area between main and circulating secondary flows varies continuously, and the velocity of circulating secondary flow is the heighest at the boundary area.
The region of circulating secondary flow varies a little according to the change of the slit width or of the slit length. Flow behaviour is, however, more influenced by deformation velocity than by the two factors above mentioned.

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Mechanism of Scrooping Sound of Silk

Part 2: Mean Slip Velocity of Stick-Slip Generated by Rubbing Two Fiber Bundles at Right Angles

Hideo Morooka, Machiko Kanayama, Kokichi Furusato

1978 Volume 24 Issue 1 Pages 7-12
Published: 1978
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.24.7

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In the previous paper[1], it was reported that the intermittent vibration generated by rubbing two fiber bundles at right angles was the stick-slip vibration caused by friction. This paper discussses its mean slip velocity. The following results are obtained:
1) Mean slip velocity can be predicted by a theoretical equation. 2) Mean slip velocity, ranging from 7 to 30cm/sec in this experiment, varies remarkably with load.

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Theoretical Analysis on Tensile Properties of Textured Yarns

Sueo Kawabata, Tetsuyuki Sasai

1978 Volume 24 Issue 1 Pages 13-18
Published: 1978
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.24.13

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In this paper, tensile properties of textured yarns will be analysed. First, the property is calculated on the basis of a “independent fiber model” where each fiber contributes independently to the yarn tensile property, i.e., no mechanical interactions among fibers are considered. One of the purpose of this paper is to examine the accuracy of this no-interaction assumption for making distinct the mechanical interaction among fibers. Second, the tensile property of a crimped single fiber is calculated by applying the so-called “strain additive method”.[1] to a helical coil model of a fiber. Then the tensile property of a textured yarn is introduced by summing up the tensile property of each crimped fiber.
A good agreement between the calculated and the observed values is obtained over a wide range of the tensile atrain of the yarn by assuming the independent model. No interaction is observed except the small deformation region.
The hysteresis behavior observed at the repeated extension is also examined, and it is confirmed that the independent model is still suitable for this case. The experimental results agree well with the calculated results with good accuracy, too.

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