Sen'i Kikai Gakkaishi (Journal of the Textile Machinery Society of Japan)

Factors Affecting Properties of Yarn Produced by Friction Spinning Machine

Part 1 : Effect of Suction Pipe Bigure and Sige on Spun Yarn Properties

Mamoru Shimakura, Hisaaki Kato

1990 Volume 43 Issue 6 Pages T45-T52
Published: June 25, 1990
Released on J-STAGE: February 12, 2010

DOIhttps://doi.org/10.4188/transjtmsj.43.6_T45

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In order to study factors influencing yarn properties in OE-friction spinning machine, we developed a test machine using a perforated roller and a non-perforated (rubber surface) roller as twisting elements.
In the present paper, about a suction pipe provided in the perforated roller, the effects of, its diameter, suction-slit width and slit shape of it on friction spun yarn properties were studied experimentally.
The results are summarized as follows :
1) Breaking strength and uniformity of friction spun yarns are improved with decreases of the suction-slit width of suction pipe. The tendency becomes lager as the spinning velosity increases.
2) The twist insertion rate by friction rollers is affected by the diameter of the suction pipe provided in the perforated roller.
3) The air flow from the fiber feeding channel to the yarn forming zone can be controlled by modifying the shape of suction pipe slit. When the peak position of the air (negative) pressure distribution determinated by the shape of suction pipe slit near the suction surface of perforated roller is located at the tip side of the yarn being formed, it is possible to improve yarn properties and to spin at higher speed.

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[title in Japanese]

N. Takata

1990 Volume 43 Issue 6 Pages P347-P356
Published: June 25, 1990
Released on J-STAGE: October 27, 2009

DOIhttps://doi.org/10.4188/transjtmsj.43.6_P347

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Study on the Color of Nylon BCF Loop Pile Carpets

Kumi Kouno, Ikuko Hirai, Toshihiro Gunji

1990 Volume 43 Issue 6 Pages P357-P364
Published: June 25, 1990
Released on J-STAGE: June 17, 2010

DOIhttps://doi.org/10.4188/transjtmsj.43.6_P357

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The behaviour of the occurrence of color in a loop pile carpet is still unknown hitherto.
This study has investigated the color of nylon BCF loop pile carpet and lateral side of pile yarn by using a variety of colorimeters.
The main results obtained are as follows :
1) To measure the color, the area to be measured should be varied according to the aim of measurement.
2) To give the color to loop pile carpet, the relationship should be clarified between chromaticity point (x, y) and the Y-values of lateral side of yarn and loop pile carpet.
3) The color of a color-mixed loop pile carpet shows the weighted average of chromaticity point of each monochrome or fundamental color. in addinion, the Y-value of loop pile carpet shows the average Y-value of each monochrome of loop pile carpet.
4) The colorimetry of bright portion (top of the loop) and dark portion (bottom between two loops) has shown the remarkable color difference between bright and dark portion. (ΔE∗ab_??_30)
5) The loop pile carpet tends to be more affected by the color of the light source with increasing the incidence-receiving angle.

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[title in Japanese]

[in Japanese]

1990 Volume 43 Issue 6 Pages P365-P370
Published: June 25, 1990
Released on J-STAGE: October 27, 2009

DOIhttps://doi.org/10.4188/transjtmsj.43.6_P365

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