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Investigation of Yarn Properties of Modified Yarn Spinning Systems with Air Nozzle Attachment

Yilmaz D., Usal M. R.

Fibres & Textiles in Eastern Europe

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2013

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Vol. 21, no. 2 (98)

43--50

EN

In the present study, conventional ring and compact spinning systems were modified with the air nozzle placed below the drafting system of the spinning frames. The modification of the conventional ring spinning system was called ‘Jetring’, while the combination of air nozzle and compact spinning system was named ‘Compact-Jet’. Actually, in literature there is not this kind of system ,and thus the Compact-Jet spinning system is a new application in the spinning field. When the properties of ring, Jetring, compact and Compact-jet yarns were compared, it was determined that modified spinning systems contribute to an effective reduction in the number of long hair length groups as well as insignificant changes in twist and tensile properties. The reduction in s3 yarn hairiness values reaches up to 40% in the Jetring spinning system. However, the Compact-jet spinning system improves the hairiness of conventional ring spun yarns by over 50%. A relatively higher reduction in yarn hairiness is possible with proper changes in the nozzle geometry and air pressure level. Nevertheless, in comparison to the Jetring spinning system, the Compact-jet spinning system is very effective regarding yarn properties, particularly yarn hairiness. The system even increases the yarn tenacity slightly.

PL

Systemy przędące tradycyjny obrączkowy i kompaktowy zmodyfikowano umieszczając dyszę powietrzną poniżej strefy rozciągania przędzarki. Modyfikację konwencjonalnego obrączkowego systemu przędącego nazwano „Jetring”, podczas gdy połączenie dyszy powietrznej z kompaktowym system przędzenia nazwano „Compact-Jet”. Stwierdzono, że zastosowanie zmodyfikowanego systemu doprowadziło do poprawy jakości otrzymywanej przędzy, wpływając zarówno na włochatość, skręt jak i wytrzymałość. Wykazano, że w zależności od zastosowanej modyfikacji można uzyskać znaczne polepszenie jakości przędzy.

2

Enhancing heat exchange in forced convection with variable air flow direction

Wawrzyniak S.

Journal of Polish CIMAC

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2012

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Vol. 7, no 1

277-284

EN

In this article there are presented tests results of the process of heat exchange between a flat plate placed vertically behind a stream element being a mono-stable jet nozzle with two states of the air outflow. Depending on the state of the air outflow, the air stream flows round a part of the wall in a different direction. In this work there are presented results of measurements recorded for selected parameters of the air outflow.

3

The influence of air distributor's geometry on combustion conditions in large-scale CFB boilers

Mirek P., Nowak W.

Archives of Thermodynamics

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2008

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Vol. 29, no. 3

37--44

EN

The article presents the results of experimental studies on two large-scale 235 MW[e] circulating fluidized bed (CFB) boilers operated under comparable operating conditions. The obtained results have shown, that the change in the shape of primary air nozzles, thus primary air distribution in the lower part of the combustion chamber has substantially influenced the intensity of the combustion process and the temperature distribution along the CFB structure height.