Last edited by Nikocage
Friday, July 10, 2020 | History

2 edition of Studies on the Dref III spinning system. found in the catalog.

Studies on the Dref III spinning system.

W. . Thierron

Studies on the Dref III spinning system.

by W. . Thierron

  • 315 Want to read
  • 38 Currently reading

Published by Sawtri in Port Elizabeth .
Written in English


Edition Notes

SeriesSawtri technical report -- no.578
ContributionsSouth African Wool and Textile Research Institute.
ID Numbers
Open LibraryOL21898847M
ISBN 100798832215

4- DREF 2 Friction Spinning Machine, Model 2/86 FT, 12 Spinning Positions Each, Currently Under Power, Intermittently In Operation. (2 Frames Running, 2 Frames Stopped) Machine Has Been Completely Upgraded With Modern Drives (Inverters) And Motors. Machines Has Be Very Well Maintained And In Excellent Running Condition. I'm not well-versed in the topic space, but a cursory review of the article and online books/journal publications suggests that the technology is "friction spinning", and "DREF" is the licensed name of the first company/machine family for performing friction spinning.

R. Chattopadhyay and S. K. sinha, " A study on spinning limits and yarn properties with progressive change in yarn count in friction spinning", AUTEX Research Journal,7,No.1, S. K. Sinha and R. Chattopadhyay, " Influence of sheath structure on twist and diameter of Dref-3 polyester- wool friction spun yarn", Indian Journal of fibre and. mai - OPEN END SPINNING - Dref system - In this process by Dr. E. Fehrer, one or more carded slivers are transformed into yarn, by theese stages: #drafting arrangement (1) #opening roller (2) #blower (3) #two perforated drums (4) #suction stream (5) #open end of the yarn (6) #cloud (7).

DRAF Interpreting Machine Drawings* (2 Hours). Prerequisites or corequisites: DRAF or department approval. This course is a required course in the computer-aided drafting and design technology program. Upon successful completion of this course, students should be able to interpret graphics used to fabricate, assemble, maintain and operate the equipment and products of industry. Opto-electronic measurement of spinning tension Studies on polypropylene - cotton spun yarns and their fabrics Book Review Textile testing: Fibre, yarn and fabric by A Basu Core coverage in DREF-III friction-spun yarns Cotton A novel technique of cotton dyeing with reactive.


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Studies on the Dref III spinning system by W. . Thierron Download PDF EPUB FB2

To explore the potentialities of the DREF-3 friction spinning system for processing man-made fibres. 6s and 12syarns were produced from % polyester. % viscose. polyester/cotton and polyester/viscose blends. The properties of these yarns were studied and compared with those of the equivalent rotor- and ring- spun by: 5.

spinning system is an Open-end and or Core sheath type of spinning system. Amongst the spinning systems, DREF provides a good platform for produc- tion of core spun yarns due its spinning principle.

Friction Spinning or Dref Spinning is a textile technology that suitable for spinning coarse counts of yarns and technical core-wrapped yarns. Dref yarns are bulky, with low tensile strength making them suitable for blankets and mop yarns, they can be spun from asbestos, carbon fibres and make filters was water systems.

[clarification needed] Yarns such as Rayon and Kevlar can be spun using. Introduction Friction (DREF) spinning system is an Open-end spinning system. Along with the frictional forces in the spinning zone the yarn formation takes place.

The DREF system is used to produce yarns with high delivery rate about mpm. DREF Friction Spinning System - Perforated Cylinders Perforated Cylinders (Perforated Drums), using suction by an internal vacuum, Studies on the Dref III spinning system.

book the individual fibres together into a new yarn. The friction is generated on the drums surface, with the continuous rotation of the drums and the fibres. DREF III The DREF-3 machine was the next version of DREF 2; intended to improve yarn quality.

It came to the market in the year Yarns up to 18s Ne. can be spun through this system. This is a core-sheath type spinning arrangement.

The sheath fibres are attached to the core fibres by the false twist generated by the rotating action of drums.

Read article about Friction (DREF) spinning system is an Open-end and/or Core sheath type of spinning DREF spinning system is used to. Thus, DREF appears to be a master key-like factor for cell proliferation.

Several differentiation-related transcription factors containing homeodomains down-regulate the function or expression of DREF by distinct mechanisms, suggesting a differentiation-coupled repression of cell proliferation via the DRE/DREF system.

PMID: S. Ishtiaque and A. Das, A Study on Structure and Tensile Properties of Individual Core and Sheath Components of DREF-III Yarn, - Paper presented on 5 th International Conference TEXSCI (Textile Science ), June, Liberec, Czech Republic, p DREF CORPORATION A member of the Nordin Technologies Group providing FRICTION SPINNING TECHNOLOGY, DREF machines, DREFDREF Abstract.

The spinning limits and properties of two finer fibers were investigated on DREF-3 friction spinning machines.

Viscose and cotton fibers were used to produce yarns on DREF-3 friction. With the DREF-5 friction-spinning machine, the individualized fibres from a single sliver are fed through a fibre transport channel into the yarn forming zone at an inclined angle to the yarn axis ().At present, the DREF-5 system is the optimum technical solution for the production of the best quality friction yarns within the count range of 15–37 tex, with production speeds of up to m/min.

The spinning limit for three different fibres (cotton, viscose rayon and polyester) on a Dref-3 friction spinning machine has been investigated. The change in yarn properties with progressive change in count has also been reported.

The count range has been seen to be dependent on fibre type. TECHNOLOGİCAL DEVELOPMENTS OF DREF SYSTEM Dref 5 was developed by Schalafhorst, Suessen and Fehrer after Dref 3,but this spinning system was not commercialized due to to various technical difficulties.

In ,Dref was demonstrated at ITMA exhibition (fig.9). It has ‘S’ and ‘Z’ direction is possible without mechanical alterations. The common frontal sinusotomy, Draf III, or modified endoscopic Lothrop procedure is an important surgical approach that has numerous indications in endoscopic sinus and anterior skull base surgery.

The most common application for the common frontal sinusotomy is in the management of chronic inflammatory sinus disease since it improves topical.

Books at Amazon. The Books homepage helps you explore Earth's Biggest Bookstore without ever leaving the comfort of your couch. Here you'll find current best sellers in books, new releases in books, deals in books, Kindle eBooks, Audible audiobooks, and so much g: Dref III.

In many studies, ecdysone has been known to regulate vitellogenesis and egg chamber maturation during mid-oogenesis [17,27]. dDREF is strongly expressed in the nucleus of follicle cells [1,28], which produce ecdysone ore, to determine whether the phenotypes of Dref KG /+ females are associated with ecdysone hormone signaling, we checked the level of the ecdysone.

Dref-III polyester-wool blended friction yams having different sheath compositions and structures were spun successfully on a friction spinning machine keeping polyester in core. The sheath composition and structure were changed by varying core content and selectively.

Tensile characteristics of Dref‐III friction core‐spun yarns. The Journal of The Textile Institute: Vol.No. 8, pp. DREF III. The DREF-3 machine was the next version of DREF 2; intended to improve yarn quality. It came to the market in the year Yarns up to 18s Ne.

can be spun through this system. This is a core-sheath type spinning arrangement. The sheath fibres are attached to the core fibres by the false twist generated by the rotating action of drums. Rieter J 20 Air-Jet Spinning Machine Com4jet piecing original animations - Duration: DREF SPINNING MACHINES - Duration: euroimpexmachinery 6, views.

Abstract. The DREF-3 spinning method produces a yarn by wrapping a fibrous core with a fibrous sheath at production speeds up to meters per minute.

The comparative merits of this high-production spinning method to spin all-cotton yarns are inves tigated and reported. Two sets of cotton differing mainly in fiber length, strength, and Micronaire reading are used in this experiment.Fehrer Dref 3 (Dref III) friction spinning machine.

Nice condition, 12 positions. For more photos and price contact us with your complete company contact information and I will be glad to send all the information you require. Machine is already skidded and ready for delivery.