Ring spinning system

Ring spinning is a long established technique used for manufacturing yams from staple fibres such as cotton, flax, wool, etc. The ring spinning system is the most flexible system, and is the most dominant method of yam production when using staple fibres. Several literatures describe its operation and process control. ... 

The ring spinning system involves three basic processes to manufacture a yam from staple fibres. They are ... 

The conventional ring spinning system can be used only with a staple fibre. By slightly modifying the conventional system, it can be used to manufacture hybrid yams, such as core spun yams. - ... 

Staple fibre aramid yams are produced by reducing a continuous multifilament yam to a bundle of staple fibres by means of steetch breaking and then spinning them into a yam using the ring spinning system. 

Feng J, Xu B G and Tao X M (2013), Systematic investigation and optimization of fine cotton yarns produced in a modified ring spinning system using statistical methods . Text Res J, 83(3), 238-248. 

Since conventional ring spinning systems take several steps to reduce fibers to a spun yarn, several alternative techniques have been developed that reduce the number of these steps. Most of these processes have more limited usefulness with regard to the range of linear densities and type and distribution of fiber lengths that can be processed by these systems,... 

Many papers focus on ring spinning. For example, in Tang et al (2010a), a mathematical model and a numerical simulation to analyze dynamic behavior and twist distribution in a modified ring spinning system are described (Fig. 14.4). 

Crank, J., (1953), A theoretical investigation of cap and ring spinning systems, Textile Research Jour nal, 23, pp. 266-276... 

Tang, H.B., Xu, B.G., Tao, X.M., Feng, J. (2010a), Mathematical modelling and numerical simulation of yarn behaviour in a modified ring spinning system, Applied Mathematical Modelling, 35, pp. 

The preference for conformer 5e has also been established for 3-alkyl-3-aryl thietane oxides194, based mainly on the analysis of the AA BB spin system of the ring hydrogens in the NMR spectrum. 

I, however, represent the only long-range interactions between C-5a and /3 protons, and C-3 proton in the spin system (ring C). The down-field second spin system is represented by cross-peaks K-M due to the aromatic protons. Even the most downfield C-8 proton (8 8.25) is seen to show a strong cross-peak L with the C-11 proton (8 7.72), a feature characteristic of HOHAHA spectra. The HOHAHA interactions are presented on the structure. 

In this example, both the -CH2- and the -CH3 would be excellent targets for irradiation and we would recommend making use of both of them. A brief inspection of the 1-D spectrum (Spectrum 8.3) is enough to confirm that the compound does have both substituents on one of the rings as four protons can easily be observed as one continuous spin system (8.13, 7.85, 7.6 and 7.48 ppm) whilst the remaining... 

The most recent application of 1,1-ADEQUATE of which the author is aware is the early 2011 report of Schraml et al.69 The isomeric S-(2-pyrrole) cysteine S-oxide (25) and S-(3-pyrrole)cysteine S-oxide (26) both have AMX proton spin systems with comparable coupling constants that do not allow differentiation of the substitution of the pyrrole ring. The 13C resonances of the two molecules are likewise quite similar and are also not amenable to the unequivocal assignment of the substitution pattern. In contrast, the Vcc derived connectivity information from the 1,1-ADEQUATE spectrum provides an unequivocal assignment of the substitution pattern for the isomeric structures. 

Entanglement in supramolecu-lar spin systems of two weakly coupled antiferromagnetic rings (Purple-Cr7Ni). Phys. Rev. Lett., 104, 037203. 

Spinning systems, wet ring, 11 615-616 Spinning/web formation, for spunbonded non woven fabrics, 17 469-474 Spinodal curves, 20 320-321 Spinodal decomposition, in polymer blends, 20 321, 322... 

NMR. The 300 MHz iR-spectrum of V-2 in D2O is shown in figure 5a. The three multiplets between 1.4 and 2.05 ppm, the two double doublets between 3.4 and 3.7 ppm, and the multiplet between 3.6 and 3.8 ppm comply well with a hydroxylysine substituent at a ring nitrogen (fig. 5b, table 2). No definite conclusion as to the total number of protons can be drawn from the spectrum, since impurities seem to be present, for example singlets at 2.2, 2.05 and 1.95 ppm. The compound V-2 was purified further by ion exchange- and adsorption chromatography and a 500 MHz ID iH- (fig. 6b) and a 2D TOCSY-spectrum (in D2O) were run. Also here, the main spin system present is the hydroxylysine residue (fig. 5b). 

As further proof of the course of the reaction between 85 and lithium alkyls, the primary product 86, resulting from the opening of the ring in compound 85 according to Eq. (13), was reacted anew with MeCl (44). At —40°C, formation of the symmetrical n-tetraphosphane 92 takes place, as shown in Eq. (17). This is an equally stable derivative, whose P H -NMR spectrum shows the characteristic resonances of an AA XX spin system. 

In the benzyl-substituted spiro compound 30 (Scheme 18), the phenyl ring (due to a weak intramolecular interaction) was folded over the 1,3-dioxan-3,6-dione moiety (78M1263) the ABMNX spin system in the H NMR spectrum therefore was analyzed in detail (in CDCI3). 

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