Journal of the Textile Machinery Society of Japan

Polypropylene Fibers Crimped by Asymmetrical Quenching

Tatsuki Matsuo

1977 Volume 23 Issue 2 Pages 29-34
Published: 1977
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.23.29

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Polypropylene crimped fibers can be produced by asymmetrical quenching under some spinning conditions. This paper deals with those spinning conditions and crimping mechanisms to get the following results:
1. The spinning conditions necessary and sufficient for providing polypropylene fibers with crimps are: i) Extruded molten filaments should be asymmetrically quenched by cross air flow. ii) The density of undrawn fibers thus obtained should be within a certain optimum range.
2. This optimum range of density varies with the linear density of fibers as shown in Fig. 8.
3. The windward side of a filament is located in the inner side of a helical crimp.
4. The diameter of a helical crimp formed by asymmetrical quenching is calculated by a theoretical equation derived in the previous report[22].
5. The reason why crimpability is the largest at such an optimum density is analysed.
6. It is experimentally and theoretically shown that the effect of the linear density on the helical crimp diameter is smaller in asymmetrical quenching than in bicomponent spinning.
7. Crimpability can be intensified with an increase of quenching air velocity and by spinning hollow fibers.

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Mechanism of Scrooping Sound of Silk

Part 1: A Method for Measuring Scrooping Sound when Rubbing Two Fiber Bundles at Right Angles

Hideo Morooka, Kokichi Furusato

1977 Volume 23 Issue 2 Pages 35-40
Published: 1977
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.23.35

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This study intends to investigate the mechanism of scrooping sound of silk. Part 1 describes a method to measure the scrooping sound of silk, and explains an attempt to find the cause of scrooping sound.
The following results are obtained:
(1) A sound generator is developed to rub two fiber bundles at right angles just as violin strings.
(2) It can generate effective frictional sound with little mechanical and outside noise.
(3) The measured sound is intermittent due to stick-slip vibration.
(4) The intermittent vibration contains both the string transverse vibration and the vibration of about 8kHz frequency.
(5) The scrooping sound found in silk handling also contains an intermittent vibration which has also about 8kHz in frequency.

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Simulation of Garment Pressure in Wear by Strip Bi-axial Extension of Cylindrically Sewn Fabrics

Tsuneo Horino, Sadako Kawanishi, Miyoko Toshimi

1977 Volume 23 Issue 2 Pages 41-46
Published: 1977
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.23.41

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External pressure caused by stretching a fabric sewn in a cylindrical form was measured by an Instron tensile tester after putting the specimen on a thin walled circular cylinder with a narrow slit. The cylinder is coated on its surface by Teflon resin, and two sets of strain gauges are fixed to its inner surface at the opposite side of the slit.
A sewn specimen just fit for the cylinder was put on this cylinder. Bending moment was applied to the cylinder by stretching the specimen along the cylinder axis. If the dimensions of the cylinder are known, the external pressure can be obtained from the bending moment measurement.
Assuming that a human body is formed of a rigid circular cylinder, the external pressure obtained in this experiment may be considered the garment pressure on a body.
Comparing the experimental results of woven fabrics with those of knitted fabrics at the same tensile strain, it was concluded that the external pressure by woven fabrics is larger than that by knitted fabrics.

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