Journal of the Textile Machinery Society of Japan

Development of MJS Yarns

Hisaaki Kato

1986 Volume 32 Issue 4 Pages 95-101
Published: 1986
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.32.95

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Fundamental Properties of Belt Nip Twister for Yarn Texturing

Tooru Takahashi, Teiryo Kojima

1986 Volume 32 Issue 4 Pages 102-106
Published: 1986
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.32.102

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Two parameters, twist efficiency and yarn delivery speed ratio, were adopted to clear the properties of the twisting and the yam delivery of a blet nip twister to get a satisfactory twisting condition.
Although these parameters varied with twister condition (B/Y ratio and the intersecting angle between the belts), the relationship between the detwisting tension/twisting tension ratio and the yarn delivery speed ratio is approximately on a master curve. So, when the yarn delivery speed ratio is equal to one, the B/Y ratio is given by: 1/(1+ε)•1/cos(θ/2) where ε: elongation ratio of untwisting, θ: intersecting angle between the belts.

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Study of Centrifugal Filament Winding

Part 2: Mechanism of Degassing

Yoshinori Nishino, Josuke Kawachi

1986 Volume 32 Issue 4 Pages 107-116
Published: 1986
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.32.107

JOURNAL FREE ACCESS

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The centrifugal pipe forming method has an advantage of better resin impregnation and degassing over other pipe forming methods. The factors affecting impregnation and degassing are pressure, vibration, temperature and materials. In the present study effects of these factors on impregnation-degassing time were experimentally studied and the approximate speed of impregnation and degassing was theoretically analysed assuming a simple mathematical model. Results:
(1) It was experimentally clarified that the short impregnation and degassing time characteristic of the centrifugal forming method is due mainly to the enhancement of bubble buoyancy by the centrifugal force and the dither effect of mechanical vibration.
(2) Speed of impregnation and degassing was mathematically analysed by setting up a simple model reflecting the experimentally observed mechanisms.
(3) The above analysis revealed that the centrifugal force increases the degassing speed but it does not influence the minimum attainable size of bubbles.

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