Open-end Spinning Research Articles

Yarn Evenness in Open-End Spinning

Open-end yarn is said to have a better evenness than ring yarn, but the truth of this statement depends on the error wavelength. It is shown that errors are reduced when the error wavelength in the yarn is less than the circumference of the collecting surface. In practice the main advantages in open-end spinning as far as evenness is concerned derive from the suppression or avoidance of drafting waves and the manufacture of large packages.

Drafting and Twisting Processes in Open-end Spinning Machine MS-400

The most characteristic features of the open-end spinning compared to the ring spinning are in the drafting and twisting mechanism. In the present paper, some discussion will be made on the analysis of the drafting and twisting processes in MS-400 open-end spinning and their relation to the properties of its spun yarn. The mechanical characteristics of MS-400 are; (1) Roller drafting device (2) Ejector for fiber separation (3) Special eyelet, a yarn guide attached to the axis of the drum. These mechanisms make MS-400 a suitable spinning machine for man-made fibers. In the first part of this paper, the behaviour of fibers in the ejector separated into individuals from a fiber bundle by the air stream will be considered. The discussion will be extended on the degree of fiber separation and the state of fibers, such as straightness at the outlet of the ejector. The second part deals with some mathematical analysis of the process of fiber collection in the drum and its self-doubling effect on the yarn irregularity. It is shown that the self-doubling effect is extremely useful for decreasing the yarn irregularity of short wave length and for improving the blend uniformity of fibers in the yarn. In the third part, the effect of the eyelet equipped in the drum is considered. The eyelet is shown to have a great influence on the yarn strength and on the end down in spinning. In the last part, a brief mention will be made on the spinning features obtained by the practical production in MS-400.

TWIST DISTRIBUTIONS IN THE FIELD OF LIQUID FRICTION

The twist distributions along a yarn depends on the properties of the yarn and on the mechanism of yarn-twisting (false twister, open end spinning and ring spinning frame).In this study, the twist distributions of yarn prepared under the various friction conditions are experimentally investigated, and numerically discussed for the yarn twisted in the high viscous fluid. The following results are obtained:1) It was recognized that the twist of the rotating yarn in the fluid distributes along the yarn axis, which is due to the fluid friction.2) When the twist distribution of the rotating yarn in the fluid is measured under constant tension, the moment of fluid friction MY is described by the following equation, in which the flow of the fluid is treated as Couette flow. hY: yarn length in the fluid (cm) η: viscosity (dyne•sec/cm2) Ω: angular velocity (rad/sec) RY: radius of the yarn (cm) RP: radius of the pipe (cm)3) The rigidity of the yarn under constant tension is measured by using the apparatus showing in fig. 3.4) The rigidity of the yarn depends on twist and tension.

A Review of Recent Development of Open-End Spinning

A Review of Recent Development of Open-End Spinning

Fatigue of Ring Spinning Yarns and Open-End Spinning Yarns by Cyclic Tension

Fatigue of Ring Spinning Yarns and Open-End Spinning Yarns by Cyclic Tension

The Open-end Spinning of Continuous Filaments

Click to increase image sizeClick to decrease image sizeKEY WORDS (SPECIFIC TERMS): FALSE TWISTCONE-SPINNINGGODET-SPINNINGOPEN-END-SPUN YARNSCORE YARNSFILAMENTSNYLON (POLYAMIDE FIBRES)KEY WORDS (BROADER TERMS): TWISTYARN PROPERTIESOPEN-END SPINNINGYARNSMAN-MADE FIBRES

Untwist and Draft of Open-end Spinning Yarn

Untwist and Draft of Open-end Spinning Yarn

The Bobtex Yarn-Making Technology: Its Future and Implications

"Bobtex" yarns are formed according to the Integrated Composite Spinning (ICS) principle by joining staple fibers and polymer right at the extrusion stage into a composite structure which utilizes the inner polymer-matrix bonding forces to from a spun yarn, with a retained twist in consequence of the interfiber and intermolecular slip in the semimolten polymer while the yarn is produced at linear wind-up speeds from 500-1000 ft/min in one continuous process from staple fibers and resin pellets. The process is fiber-independent, permitting conversion of natural, synthetic, or mineral staple fibers, of long or short staple in a blend with any type of thermoplastic polymer into composite "Bobtex" ICS yarns which are satisfactory for numerous end uses. The implications of this Canadian invention and development are analyzed in the light of its flexibility to engineer yarn properties as well as considerations of reduced costs of spun yarn production, substantial raw-material savings, as well as increases in productivity per worker and per capital invested. After many years of intensive research and development activity, the "Bobtex" ICS technology is reaching commercial status. 'I'his activity has also resulted in the "Bobtex" Aerodynamic Brake Spinning (ABS) which is now in the tabora tory stage. Basically different from turbine or centrifugal forces utilizing open-end spinning systems, the "Bobtex" ABS method produces 100% staple fiber yarns twisted in an axial direction by a false-twist type spindle imparting a positive twist and producing a linearly wound-up yarn package at output speeds many times faster than any hitherto known open- end systems.

Open-End Spinning The Problem of Fiber Opening and Yam Formation

The principles of open-end spinning are reviewed. This is followed by a discussion of the problems of fiber opening and yarn formation. Data on spinning trials are given. Considerable progress in open-end spinning for coarse yarns is predicted.

100台のBD-200型オープンエンド精紡機を運転して

100台のBD-200型オープンエンド精紡機を運転して

A Study on Open-End Spinning

The concept of the fiber separation probability was introduced to the open-end spinning system by Kawabata et al.[2] Although they prepared the theory of separation at one point, this paper deals with the theory under the assumption of zone draft, and the draft ratio needed to separate a sliver into individual fibers by air-flow was calculated in ideal drafting case with random sliver model.Not only the ideal separation but also separation in groups were observed by high-speed photography [Note 1]. Silvers may be separated in groups because fibers are apt to stick each other and to be entangled with each other [Note 2]. This phenomena was re-examined by Monte Carlo simulation analysis on a digital computer. Separation in groups, while it is one of the origins of yarn unevenness, makes a handy means to reduce the draft ratio needed to avoid false-twist in open-end spinning.

プラハ国際オープン エンド紡績会議報告

プラハ国際オープン エンド紡績会議報告

オープン エンド紡績に関する国際会議に出席して

オープン エンド紡績に関する国際会議に出席して

オープンエンド精紡機におけるドラフト過程の特長について

オープンエンド精紡機におけるドラフト過程の特長について

国産オープンエンド精紡機“BD -200”より紡出されたBD糸およびその製品について

We report on the quality of BD yarn and its end-uses which are mass-produced by open-end spinning Machine, BD-200, made in Japan. We also discuss about the proper use of end uses of BD yarn.The main results are as follows; BD yarn spun by the Japanese Machine : (1) has about 5% higher strength than the yarn spun by the imported Machine.(2) will haye an almost equal strength to that of ring Machine yarn without raising the cost of raw cotton, fore-spinning process and spinning condition are properly selected.(3) shows the greatest strength at the twist coefficient about 5.56.0.(4) has almost equal evenness to that of combed yarn.(5) is superior in bulkiness, abrasion resistance and dyeability owing to single thread helical construction.(6) decreases 50100% in yarn breaks during a warping and weaving process.(7) can be used for the same end-uses as those of ring-frame yarn if we pay a little consideration.(8) will give end-uses which are excellent in appearance, thickness, stiffness and harshness.

バスケット式オープンエンド精紡について

バスケット式オープンエンド精紡について

オープンエンド紡績法の特集に当たって

オープンエンド紡績法の特集に当たって