Analysis of formation of mass irregularity in drafting device during yarn spinning from sliver

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24410%2F19%3A00007024" target="_blank" >RIV/46747885:24410/19:00007024 - isvavai.cz</a>

Result on the web

<a href="http://vat.ft.tul.cz/2019/3/VaT_2019_3_5.pdf" target="_blank" >http://vat.ft.tul.cz/2019/3/VaT_2019_3_5.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Analysis of formation of mass irregularity in drafting device during yarn spinning from sliver

Original language description

This work deals with an analysis of formation of mass irregularity of fibrous product in a drafting arrangement of air-jet spinning machine. Sliver is supplied into the machine and attenuated in four-line double-apron drafting arrangements before formation into yarn. There, the total draft is realized within three zones: infeed draft, intermediate draft and main draft. In the work, the components of mass irregularity (limiting, systematic, additional and systematic developed from latent (immeasurable) irregularity), which form the structure of total mass irregularity of fiber strand in the output from the drafting unit, were defined. Transformation of mass irregularity of fibrous assembly by this drafting device was theoretically analyzed. The theoretical analysis of machine irregularity was realized too. Within the experiment, 100% Tencel yarns of count 23 tex were spun from the sliver of three various linear densities using the Rieter air-jet spinning machine J20. Three levels of intermediate draft ratio were also set. Proportionally to it, the level of main draft ratio was changed, while the both infeed draft ratio and other spinning parameters were kept constant. Sliver and yarn mass irregularity as well as number of yarn faults were measured and analyzed, machine irregularity was calculated. The results showed that the lowest value of yarn mass irregularity is achieved when the sliver with higher linear density in combination with the lowest level of intermediate draft ratio (both from the observed range) is used for air-jet yarn production. It confirmed the theoretical analysis that draft ratios in infeed and intermediate drafting zone has more significant importance for air-jet yarn mass irregularity compared to the level of main draft ratio. Sliver mass irregularity is also very important factor for total yarn mass irregularity. Similar results were also recorded for number of yarn faults (especially for thin places (-40%)).

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20503 - Textiles; including synthetic dyes, colours, fibres (nanoscale materials to be 2.10; biomaterials to be 2.9)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Vlákna a Textil

ISBN

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ISSN

1335-0617

e-ISSN

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Number of pages

7

Pages from-to

23-29

Publisher name

Slovak University of Technology in Bratislava

Place of publication

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Event location

Liberec

Event date

Jan 1, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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