Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H7/00—Spinning or twisting arrangements
  • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
  • D01H7/86—Multiple-twist arrangements, e.g. two-for-one twisting devices ; Threading of yarn; Devices in hollow spindles for imparting false twist
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
  • D01H1/10—Spinning or twisting machines in which the product is wound-up continuously for imparting multiple twist, e.g. two-for-one twisting
  • D01H1/105—Arrangements using hollow spindles, i.e. the yarns are running through the spindle of the unwound bobbins
  • D01H1/106—Two-for-one twisting
  • D01H1/108—Two-for-one twisting for two or more supply bobbins one on top of the other
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
  • D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
  • D02G3/322—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic using hollow spindles

Definitions

• the invention relates to a method for producing an elastic wound yarn according to the preamble of claim 1.
• DE 1 173 367 describes a process for the production of twists, in which in a in the first stage of the process, the individual threads are duplicated or widened, and with a slight one Pre-twisted up to 3% of the nominal twist and thus pre-twisted Then, in a second stage of the process, thread another thread on a thread Bell spindle are subjected, whereby the nominal rotation is achieved.
• the first stage of the process is carried out on a ring twisting machine, while the High swirl in the second process stage, for example on one Double wire twisting machine can be carried out.
• the disadvantage of this method is that the spindle speed is reduced by the Runner speed of the ring spinning machine used is limited to about 40 m / s because as is known, blocking or seizing at higher rotor speeds Ring and runner take place. High spindle speeds are therefore possible with the described method not possible.
• the centrifugal force of the yarn could admit another Increase in spindle speed will be increased, but once the yarn co-rotates Breaks air boundary layer and then at high peripheral speed on the If the ambient air comes to a standstill, it is destroyed or at least damaged to the extent that it is no longer meets the requirements in the finished product. Furthermore, it is extremely high Spindle speed on Uptwister winding machines because of the high Energy consumption is not economical.
• the pot in whole or in part provide surrounding, non-driven intermediate housing, which in the spinning chamber or is mounted on the drive motor of the pot and from the wall of the spinning chamber just as it is at a small distance from the spin pot in relation to the diameter.
• double-pot spindle used in the first process stage of the two-stage twisting process so-called double-pot spindle used, which is also known as an energy-saving spindle and the basic structure of which results from the above-mentioned DE 1 104 653.
• double-pot spindle in the first process stage can be considerable higher speeds of well over 10,000 rpm are driven; there have already been Speeds of over 18000 rpm achieved. These high speeds ensure that even very fine yarns detach from the edge of the supply spool and process them to let. At the same time, relatively little energy is required despite the high speed.
• double-pot spindle in the first process stage ensures that there is no or only very little turbulence during the circulation of the thread form, whereby the thread tension can be kept substantially constant and Thread breaks can be reliably avoided.
• the disadvantages of the open system known from the first process stage no longer occur open, because the rotating inner pot is sealed off from the outside air.
• the inner pot carries the bobbin and consequently no air boundary layer forms on the bobbin the yarn can detach itself freely from the bobbin and become attached to the inner surface of the Put the inner pot down before pulling it up.
• In the interior of the inner pot an environment for the yarn that comes very close to a vacuum. That is why Detachment of the yarn from the bobbin does not depend on the spindle speed either, because that Yarn does not have to overcome drag.
• the yarn also comes during the Winding process does not come into contact with the standing outside air and cannot be damaged still to be destroyed.
• the air boundary layer does not form on the coil, but on the outer surface of the inner pot.
• the turbulent air flow creates friction between the air boundary layer and the stationary ambient air. This friction determines the energy consumption of a pot spindle.
• the second pot is driven by the air boundary layer of the inner pot and reaches about half the speed of the driven inner pot, whereby the relative speed is divided in relation to the standing outside air.
• the drive power of a pot spindle increases with the third power of the speed, ie the sum of 2 x 9000 min -1 results in a 40% lower energy consumption compared to 1 x 18000 min -1 with the same production output.
• the optimal number of pre-rotations can be free in the first process stage should be selected, preferably these should exceed 50% of the total rotations in order to obtain optimal conditions in the second process stage.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Spinning Or Twisting Of Yarns (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7639419

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Citations (5)

Family Cites Families (3)

• 2000
  • 2000-04-20 DE DE10019555A patent/DE10019555C2/de not_active Expired - Fee Related
• 2001
  • 2001-03-14 EP EP01106203A patent/EP1148160A1/fr not_active Withdrawn
  • 2001-04-18 US US09/836,990 patent/US6467250B2/en not_active Expired - Fee Related

Patent Citations (5)

Non-Patent Citations (2)

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