Volker Jehle

• Professor (Full) at Reutlingen University

Cotton contamination by honeydew is considered one of the significant problems for quality in textiles as it causes stickiness during manufacturing. Therefore, millions of dollars in losses are attributed to honeydew contamination each year. This work presents the use of UV hyperspectral imaging (225-300 nm) to characterize honeydew contamination o...

UV hyperspectral imaging (225 nm–410 nm) was used to identify and quantify the honeydew content of real cotton samples. Honeydew contamination causes losses of millions of dollars annually. This study presents the implementation and application of UV hyperspectral imaging as a non-destructive, high-resolution, and fast imaging modality. For this no...

The wet-laid nonwoven as a preform manufacturing technique for C/C-SiCs has been pioneered in this study and holds great promises for the field, especially for hybrid materials. The wet-laid nonwovens are compatible with liquid silicon infiltration (LSI), and standalone samples of the wet-laid nonwoven ceramics, as well as a hybrid material, were p...

"Wir etablieren die Nassvliestechnik in Reutlingen", verkündete Prof. Dr. Volker Jehle, Leiter des Lehr- und Forschungszentrums für interaktive Materialien an der Hochschule Reutlingen, gegenüber avr. Und er meinte damit die jüngst installierte Nassvliespilotanlage NVLA 53 der Firma Pill Nassvliestechnik (NVT), sein "Forschungsleuchtturm", mit dem...

With the CPS (cot protection system) by Spindelfabrik Suessen, Süßen/Germany, it is possible to improve the maintenance of a ring-spinning drafting system. The wear mechanism of a standard cot can be avoided. This enables a spinning mill to benefit from a long-time quality consistency without the influence of grinding cycles. The CPS offers many be...

The task of the carding process is to thin out fiber flocks, to orient them, and to turn them into a card sliver. When dealing with cotton, dust is eliminated, and there is cleaning and elimination of nits. The more intensive the carding, the better is the performance of these actions. The most important working element for this today is the travel...

Fixed carding systems are an advantageous alternative to shifting covers with respect to high output carding. The expense to service them is slight. They improve carding quality, enable higher cylinder rotational rates, and achieve better use of the raw material. The structure of such a system is presented.

Die Karde beeinflußt die Garnqualität wesentlich. Ihre Aufgabe ist es, Faserflocken bis zur Einzelfaser aufzulösen, zu orientieren, Nichtfaseranteile, Staub, Kurzfasern und Faserverknotungen wie Nissen zu entfernen. Dabei soll die Karde diese Aufgaben, ohne die Faser zu schädigen, erledigen. In den letzten 20 Jahren konnte der Faserdurchsatz beim K...

Particle image velocimetry is an excellent aid to the recording and visualisation of flows in textile machines. For the first time, it is possible to follow the air flows occurring in the carding process under production conditions. Air flow patterns during cotton cleaning in the preparatory and carding stages can be analysed precisely, and ways of...

A feature of new developments in carding is on-line monitoring for quality control purposes. An analysis of the future prospects for the process of spinning staple fibres leads to the conclusion that the carding process will continue to be one of the key processes essential to improvements in spinning yields, quality and process reliability.

Card setting in the dynamic state is decisive for carding results. For the first time, it is now possible by electronic flat clearance measurement to determine the dynamic and thermal effects of the card on flat clearance, and to take them into account in setting. It is also possible to record and correct flat clearance between the setting points....