Winterthur, Switzerland
Winterthur, Switzerland

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Patil N.T.,Veermata Jijabai Technological Institute VJTI | Borkar S.P.,Veermata Jijabai Technological Institute VJTI | Weidner-Bohnenberger S.,RIETER Machine Works Ltd | Schnell M.,RIETER Machine Works Ltd
Journal of the Textile Association | Year: 2017

Today Ring, Rotor and Air-jet spinning system are commercially used for yarn production. Each spinning technology creates a typical yarn structure. This yarn structure determines the characteristics of the yarn itself, the characteristics in downstream processing and finally of the subsequent textile product. Textile fabrics with the softest touch can be undoubtedly produced from combed ring yarn. In order to manufacture a soft rotor yarn, the twist factor must be set low and supportive measures need to be undertaken in textile finishing. Rotor spinning has a great potential to reduce the twist factor, which is the basic prerequisite for the production of knitted fabric with a soft touch; by support of a new spin box generation and its components. Similarly the air-jet spinning system is now moving from 100% CV into new applications like CO blends and 100% CO combed for knitting. The challenge is to compete the softness of a conventional ring yarn. The main objective of this study is to compare the effect of twist level, spinning components, process parameters on yarn properties such as yarn packing density which will support in improving the fabric hand for Rotor and Air-jet yarn.The other objective of this study is to check the impact on strength and elongation due to reducing the twist. © 2017, Textile Association (India). All rights reserved.

Smolenicki D.,ETH Zurich | Boos J.,ETH Zurich | Kuster F.,ETH Zurich | Roelofs H.,Swiss Steel AG | Wyen C.F.,Rieter Machine Works Ltd.
CIRP Annals - Manufacturing Technology | Year: 2014

In order to represent actual cutting process conditions, an in-process tribometer is examined to measure friction during orthogonal turning process at cutting speeds up to 300 m/min. The tribometer consists of a spring preloaded tungsten carbide pin with spherical tip mounted behind the cutting edge and rubbing on the freshly generated workpiece surface. The pin preload is set according to feed force. A 3D-force measuring device in the fixation of the pin allows evaluating friction coefficient from tangential and normal forces. Experiments show strongly different results when contacting fresh and oxidized surfaces and decreasing friction coefficient with increasing cutting speed. © 2014 CIRP.

Wyen C.-F.,Rieter Machine Works Ltd. | Wyen C.-F.,ETH Zurich | Jaeger D.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Wegener K.,ETH Zurich
International Journal of Advanced Manufacturing Technology | Year: 2013

The influence of the cutting edge micro geometry on cutting process and on tool performance is subject to several research projects. Recently, published papers mainly focus on the cutting edge rounding and its influence on tool life and cutting forces. For applications even more important, however, is the influence of the cutting edge radius on the integrity of the machined part. Especially for titanium, which is used in environments requiring high mechanical integrity, the information about the dependency of surface integrity on cutting edge geometry is important. This paper therefore studies the influence of the cutting edge radius on surface integrity in terms of residual stress, micro hardness, surface roughness and optical characterisation of the surface and near surface area in up and down milling of the titanium alloy Ti-6Al-4V. Moreover, the influence of the cutting edge radius on burr formation is analysed. The experiments show that residual stresses increase with the cutting edge radius especially in up milling, whereas the influence in down milling is less pronounced. The influence of the cutting edge radius on surface roughness is non-uniform. The formation of burr increases with increasing cutting edge radius, and is thus in agreement with the residual stress tests. © 2012 Springer-Verlag London Limited.

Schnell M.,Rieter Machine Works Ltd.
Melliand International | Year: 2012

With its high operating speed of up to 450 m/min and 120 spinning units, the J 20 air-spinning machine from Rieter leads the productivity scale. Thanks to the newly developed duo-spinning unit, the J 20 offers maximum yarn quality, productivity and flexibility.

Rusch B.,Rieter Machine Works Ltd. | Baumli M.,Rieter Machine Works Ltd.
Unitex | Year: 2010

Individual Spindle Monitoring (ISM) in conjunction with SPIDERweb supplies data from each individual spinning position and indicates trouble spots. The data collected can be analyzed easily and conveniently on the computer and the causes of faults can be remedied immediately. Lamps on the headstock and tailstock of the machines indicate ends down for operators outside of the ring spinning aisles. SPIDERweb collects all data from the blowing room to the final spinning process. Production and quality data or data on the machine's running behavior are analyzed and evaluated in clearly structured tables, simple charts and diagrams. SPIDERweb software simultaneously records the malfunctions that are detected when collecting data. The malfunctions can then be analyzed on the computer. ISM not only guides the operator to problem spinning positions, it monitors each spinning position continuously and transmits the data to SPIDERweb.

Schnell M.,Rieter Machine Works Ltd.
Melliand International | Year: 2014

The new J 20 air-jet spinning machine by Rieter with 200 spinning units per machine is twice as long as conventional air-jet spinning machines, which is made possible by the unique machine design and innovative automation.

Muller J.,Rieter Machine Works Ltd.
Melliand International | Year: 2013

The SB-D 22 double-head drawframe without autoleveling by Rieter guarantees maximum machine efficiency with a unique can changer for cans up to 1,000 mm in diameter. The draw frame, featuring a maximum delivery speed of 1,100 m/min, reduces the cost of personnel, premises and energy for spinning mills.

Stampfer A.,Rieter Machine Works Ltd.
Melliand International | Year: 2013

The exclusive use of 1,000 mm (40") diameter cans in spinning preparation improves profitability due to higher machine efficiency, reduced personnel requirements and lower capital costs. Rieter offers an automated can changer for this can format at all process stages in spinning preparation (Fig. 1).

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