Roving (roving)

Roving is an English term for a so-called roving, i.e. H. a slightly twisted staple fiber band as an intermediate stage ( semi-finished product ) in yarn production .

Importance of the roving in the yarn manufacturing process

In order to be able to produce very fine (thin, with a low length-related mass) yarns during ring spinning , it is necessary to provide rovings with the lowest possible length-related mass as the starting material. So that these relatively fine roving yarns can be wound up on supply spools without being destroyed and later unwound from them, they are given a slight twist (a slight twist, a slight torsion), but still remain warpable (refinable). The roving can be made from different staple fiber ribbons. By rotating a sliver around its longitudinal axis, forces act on the individual staple fibers in the direction of the center of the sliver, whereby the fibers are pressed together. This increases the friction between them, which in the event of a load in the longitudinal direction leads to an increased resistance of the roving to being pulled apart. The turning results in a compression and thus a smaller diameter of the roving. A staple fiber sliver receives the slight twists either on a flyer, a roving machine, or a Nitschel mill.

Flyer for roving production

The flyer ("wing") is mainly used in three-cylinder spinning and worsted yarn spinning . The staple fiber sliver (stretch sliver) originating from the upstream processes of doubling and stretching (warping) is passed through a guide eye, which acts as a twist jam, and then guided to the rotating fork-shaped wing that causes the roving to rotate. The roving (flyer fuse) thus provided with slight twists is wound onto a flyer spool. This is presented to the ring spinning machine in order to be spun into a yarn with the desired properties.

Nitschel factory for roving production

The Nitschel plant is used in particular in carded yarn spinning . After the roving card, the fiber pile discharged from the roving card is divided into narrow pile strips by means of a multi-strap pile divider. Since these can hardly withstand external influences, they are sent to a Nitschel factory. There, the pile strips are slightly rounded and compressed between two elastic bands (so-called nitschel pants) that are arranged on top of each other and that simultaneously perform a vertical transport movement, and then fed to the bobbin winder. The rovings (Nitschel strips) produced in this way can then be processed into yarn on the ring spinning machine.

Others

Rovings are also processed directly into textile fabrics using textile handicraft techniques (e.g. hand knitting by Lopi ).

Individual evidence

↑ Sabit Adanur: Wellington Sears Handbook of Industrial Textiles. Technomic Publishing Co., Inc., Lancaster • Basel 1995, ISBN 1-56676-340-1 , p. 73.
↑ Anton Schenek: Encyclopedia yarns and threads. Properties and manufacture of textile threads. Deutscher Fachverlag GmbH Frankfurt am Main 2006, ISBN 3-87150-810-1 , p. 390.
↑ Harald Perner: Technology and machines for yarn production. VEB specialist book publisher. Leipzig 1969, p. 490.
↑ Ursula Völker, Katrin Brückner: From fiber to fabric. Textile materials and goods science. 33rd, revised edition. Publishing house Dr. Felix Büchner - Verlag Handwerk und Technik, Hamburg 2007, ISBN 978-3-582-05112-7 , p. 103.

[1] Sabit Adanur: Wellington Sears Handbook of Industrial Textiles. Technomic Publishing Co., Inc., Lancaster • Basel 1995, ISBN 1-56676-340-1 , p. 73.

[2] Anton Schenek: Encyclopedia yarns and threads. Properties and manufacture of textile threads. Deutscher Fachverlag GmbH Frankfurt am Main 2006, ISBN 3-87150-810-1 , p. 390.

[3] Harald Perner: Technology and machines for yarn production. VEB specialist book publisher. Leipzig 1969, p. 490.

[4] Ursula Völker, Katrin Brückner: From fiber to fabric. Textile materials and goods science. 33rd, revised edition. Publishing house Dr. Felix Büchner - Verlag Handwerk und Technik, Hamburg 2007, ISBN 978-3-582-05112-7 , p. 103.