Journal of the Textile Machinery Society of Japan

Stretch-Breaking Process Analytically Studied

Part 2: Pseudo-Stretch-Breaking on the Turbo Stapler

Takashi Hiramatsu, Noboru Oguchi, Goro Ozawa

1969 Volume 15 Issue 4 Pages 121-130
Published: 1969
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.15.121

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The purpose of this instalment is to obtain fundamental data on the staple length, sliver thickness and stretch-breaking force of the Turbo Stapler and devise methods to analyze them.
Before fiber leading ends reach front roller3, breaking points are produced on some fiber, invariably with a constant probability, by breaker bars. Fibers which have no breaking points before reaching front rollers are stretch-broken by front rollers.
It is handy to assume, therefore, that the entire fiber-breaking process of the Turbo Stapler is a stretch-breaking process. Let us call positive breaking by breaker bars “pseudo-stretch-breaking.” Let us call by front rollers “true stretch-breaking.”.
The delivery length in the pseudo-stretch-breaking process is zero. The probability density of breaking points in the pseudo-stretch-breaking process is fixed by the above-mentioned constant probability and by the characteristics of the true stretch-breaking process. The pseudo-stretch-breaking acts to make the staple diagram nearly trianglular in shape. It also acts to reduce the stretch-breaking force and, perhaps, sliver thickness variations also. The quantity and probability density of breaking points of the pseudo-stretch-breaking process and of the true stretch-breaking process are experimentally obtainable. Some experimental results are given.

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A Study on Open-End Spinning

Part 1: Separation in Groups of Fibers

Minoru Uno, Akira Shiomi, Nobuyoshi Sakoda

1969 Volume 15 Issue 4 Pages 131-140
Published: 1969
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.15.131

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The concept of the fiber separation probability was introduced to the open-end spinning system by Kawabata et al.[2] Although they prepared the theory of separation at one point, this paper deals with the theory under the assumption of zone draft, and the draft ratio needed to separate a sliver into individual fibers by air-flow was calculated in ideal drafting case with random sliver model.
Not only the ideal separation but also separation in groups were observed by high-speed photography [Note 1]. Silvers may be separated in groups because fibers are apt to stick each other and to be entangled with each other [Note 2]. This phenomena was re-examined by Monte Carlo simulation analysis on a digital computer. Separation in groups, while it is one of the origins of yarn unevenness, makes a handy means to reduce the draft ratio needed to avoid false-twist in open-end spinning.

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Textile Machinery Exhibits at 1969 Tokyo International Trade Fair

Rikuhiro Kinoshita

1969 Volume 15 Issue 4 Pages 141-150
Published: 1969
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.15.141

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