EP0887447B1 - Method for the continuous manufacturing of a yarn with low curling tendency - Google Patents

Description

The invention relates to a method for continuous Production of a twine with a low tendency to curl.

Staple fiber yarns are finally made of long individual fibers manufactured, aligned and bundled in parallel become. The fibers are mostly natural fibers, e.g. Wool and cotton. But you can also use synthetic fibers getting produced. In addition there are endless filament threads tailored to the fiber length of natural fibers.

And from a bundle of staple fibers. To produce yarn the mechanically resilient, must be on one the desired degree of fineness Rotation are granted. This happens in a spinning process, which increases fiber-to-fiber friction.

The result is a yarn with greatly improved dynamometric properties. The higher the fiber strand issued considering the fiber breaking limit Rotation is set, the firmer the generated Yarn.

The fiber bundle - but also the individual in the bundle located fiber - takes the imprinted rotation (the torque) only against the resistance of the inner Forces of the individual fibers. Only after a certain time has elapsed Time span and at the same time the Thread tension leads to a so-called relaxation in the twisted fiber strand, i.e. there is a state of equilibrium the internal fiber forces, i.e. by the shape imposed on the spinning process is "frozen".

Wen a freshly twisted yarn following a spinning process themselves, i.e. free to develop the fiber bundle and the one embedded in it strives Single fiber - following the so-called memory effect - one Reverse rotation on. The consequence of this is a curling Yarn. This behavior of the twisted fiber strand or The fiber bundle can only be removed by a deposition process fiber-specific time constant in terms of relaxation - or by artificial fixation, for example by a Moisture / heat treatment.

To create a thread from staple fibers needs at least two spun threads or spun yarns around their common axis - mainly against the spinning direction of rotation - be rotated. The one in a previous one Spinning process twisted fiber strands (spun threads) and learn about the individual fibers involved in the bond a backward rotation that can go as far in individual cases, that the spin generated by the spinning process completely will be annulled.

From the spinning process, the spun threads or spun yarns have a shape memory, which during the twisting process de Counteracts the twist of the thread. It can therefore in the twine to an imbalance between those caused by the Forced twisting and the de twisting Spinning strands and the individual fibers come forces The result is a lively, strong to curl tending thread, the intensity of curling tendency in a direct link to the extent of the Spinning process granted rotation of the spun threads on the one hand and the degree of twist on the other hand.

This behavior of the thread can be the same as for the filament only by a deposition process or by artificial Fixing counteracted as part of a damp / heat treatment become.

There are various combined or integrated spun twisting processes have been proposed in which a twisting process immediately follows the spinning process.

From the publications FR 15 52 320 and DD 78 710 from the 1969 and 1970 as well as DE 44 31 830 C1 and the Methods and devices are known from DE 44 30 917, where by means of two neighboring, i.e. side by side or OE spinning units arranged one above the other individual spun threads are generated which after merged into spinning and twisted become.

During the DD 78 710 the combined spinning and twisting process only describes in a general way, without one The DE describes specifying a constructive solution 44 30 917 C1 a constructive solution for the implementation an integrated spinning-twisting process. there are dissolved individual fibers at least two in one shared rotor mounted OE spinning units, which are arranged within a double wire spindle are such that the means of the OE spinning units produced spun threads immediately after their Generation according to the double wire twisting process to be twisted into a thread.

According to FR 15 52 320 follows at least two stationary in a common machine frame mounted OE spinning rotor on a ring twisting unit, however, it is questionable whether due to the different Processing speeds of OE spinning rotors on the one hand and ring twisting units on the other this procedure is practicable at all.

According to DE 44 30 917, the dissolved individual fibers two OE spinning units mounted in a common rotor fed through the rotor axis, and the are emerging from the spinning aggregates immediately afterwards subjected to a single-wire twisting process.

In an effort to process the three spinning, winding and Merge threads into a single continue process, it is known to put a yarn head on a hollow spindle to attach, which previously e.g. on a common ring spindle has been manufactured. One from a roving, for example Attachment creel, incoming roving runs through normal drafting system and is used together with the filament the one previously attached to the hollow spindle Thread head inserted into the spindle hollow axis. The Yarn from the bobbin is unwound during the spindle revolutions and runs together with the pre-stretched one Roving through the hollow spindle to a take-up unit or a winding unit, e.g. in "a new spinning twister" from "Melliand Textile Reports 12/1966", Pages 1354 and 1355.

In a method described in DE 44 28 780 C1 to produce a twisted thread in one first step two subtracted from roving stocks and roving threads guided by drafting systems each independently spun from each other by the ring spinning process and on hollow spindles arranged one above the other permanently attached yarn carriers to two spun yarn bodies wound. In a subsequent second step the previously wound onto the spun yarn bodies Spinning threads back from the spinning each with balloon formation stripped and through the hollow axes of the respective Hollow spindles while the through the upper hollow spindle also spinning thread the lower hollow spindle together one below the lower Hollow spindle arranged winding unit supplied. The Hollow spindles are dependent on the withdrawal speed of the take-up unit in such a way that the rotation of the two spun threads partially turned back becomes.

The two systems discussed last are in each case around ring spindles, the threads of which subsequently form one Twisting processes are fed.

The invention has for its object a low torque To produce twine with a low tendency to curl, the can be processed directly and easily without that longer deposition times in the sense of the above statements or additional fixation procedures are required.

Low-torque threads with low curling tendency for most processing purposes and areas of application called for the usual harmful influences so-called "wild" yarns or threads as low as possible to keep.

1. eine kurze Verweildauer des Spinnfadens bzw. Spinngarnes in der Spinnzone, d.h. der Zeitfaktor,

2. das Aufrechterhalten einer bestimmten Fadenzugkraft bzw. Fadenspannung, der die Spinnfäden und der direkt anschließende Zwirn bis zur endgültigen Aufwicklung auf der Zwirnspule unterliegen, und

3. keine Aufspulung des Spinnfadens als Zwischenprozeßstufe und damit keine Möglichkeit der Entspannung des Spinnfaserstranges und als Folge davon kein Eintreten eines Memory-Effektes im Spinnfaden, welcher einer während des Zwirnprozesses entgegengesetzt gerichteten Drehung entgegenwirken könnte.

The methods according to the independent claims 1 and 2 serve to solve this problem, according to which three factors are significant in order to achieve the desired goal, namely

1. a short dwell time of the spinning thread or spinning yarn in the spinning zone, ie the time factor,

2. the maintenance of a certain thread tension or thread tension, which the spinning threads and the directly subsequent thread are subject to until the final winding on the thread spool, and

3. no winding of the filament as an intermediate process step and thus no possibility of relaxation of the spun fiber strand and, as a result, no occurrence of a memory effect in the filament, which could counteract a rotation that is opposite during the twisting process.

It is stated that the method according to the invention with the means available on the filing date can be carried out that it is the upstream Spinning process taking into account the downstream Twisting process around an OE spinning process or Air spinning process.

The solution to the desired goal is for the spinning process and the twisting process an uninterrupted process with almost constant thread tension (Thread tension) and a very short time phase or distance between the completed spinning process and the twine binding zone and thus also the termination the twisting phase. So that after the Introduction of the spin twist to produce the single spun yarns striving the fiber bundle back into one parallel position or the formation of a shape memory to the spin spin state only a minimal amount of time made available. Because of the constant the thread tension or thread tension becomes a "freeze" the twisted fiber bundles and individual fibers as well counteracted.

The thread tension parameters specified in claims 1 and 2 depend on the staple fiber material to be processed, the embodiment of the device used and the respective process parameters.

The tensile force values can preferably be obtained from delivery plants between the spinning zone and the twisting zone.

As a result of tightening the time and keeping it constant the single spun yarns have the thread tension very little resistance to the following Twisting, and a spinning / twisting twist is formed, whose internal restoring moments are minimal. Since that Restoring moment in the package based on those described above Connections with it is minimized Equilibrium by relaxing the threads on the Wind up after a very short time. That way the memory effect in the elastic thread medium and in elastic spinning medium almost completely avoided and it will thus also not transferred to the twisted state, whereby the curling tendency is largely switched off. Preferably you put the time interval between the End of the spinning phase and the end of the twisting phase to a value of <0.5 second, and in particular <0.1 Second, firm.

Depending on the target thread, the following spinning-thread delivery speeds are preferably selected: nm tex Delivery speed range m / min 2.20 50 x 2 100-200 50/2 20 x 2 60-170 70/2 14 x 2 40-140

Figur 1

zeigt in schematischer Darstellung teilweise im Schnitt eine Ansicht einer kombinierten Spinn-Zwirneinrichtung;

Figur 2

zeigt in schmatischer Darstellung teilweise im Schnitt eine integrierte Spinn-Zwirneinrichtung, jeweils zur Durchführung des erfindungsgemäßen Verfahrens.

Devices suitable for carrying out the method according to the invention are shown by way of example in the following drawings.

Figure 1

shows a schematic representation, partly in section, of a view of a combined spinning / twisting device;

Figure 2

shows a schematic representation, partly in section, of an integrated spinning-twisting device, each for carrying out the method according to the invention.

The device shown in Figure 1 comprises a in a machine bed 1 mounted conventional ring twist spindle 2, the two each shown as black boxes Spinning units 3.3 are connected upstream. It can are each a common air spinning unit, in which, according to DE 40 04 049 A1, one to a desired one Yarn count stretched sliver fed to an air nozzle , which is a particularly tubular thread channel has, in which at least one blowing nozzle opens tangentially, in order to effect the spinning process in the thread channel Vortex flow with a given direction of rotation to create.

The ring twisting spindle 2 comprises for the rotary drive a twisted bobbin 4 by means of a tangential drive belt 5 driven spindle whorls 6, as well as an up and down movable ring 7 with assigned ring traveler 8.

The route "a" gives the distance and, taking into account derived from the thread delivery speed, the time factor between that represented by the black boxes 3 .Spinning zone and that of the ring traveler 8 defined twisting zone. Between the spin zone and A common thread guide 9 is located in the twisting zone.

The device shown in Figure 2 contains one Spinning part I with at least two side by side in one Machine frame 11 mounted OE spinning rotors 12, 13, into the fiber material feed channels in the usual way 14, 15 open out.

This spinning part I is a double-wire twisting unit II assigned that as a double-wire twist spindle with internal Winding spool A is formed. Such Double wire twisting spindle is for example in the DE 12 92 555 C2 (= US 3 368 336) treated on the with regard of the individual construction elements expressly is referred. A contains as essential components such a double-wire twisting spindle using a tangential drive belt 17 drivable hollow whorls 18 that together with the thread storage disk 19 and the overflow plate 20 forms the spindle rotor.

For example, by means of a pair of rollers 16-16 kick the OE spinning rotors 12, 13 drawn off spun threads axially from below through the hollow whorl 18 led out radially outwards through the thread storage disk 19 and move from the edge of the overflow plate 20 in the form of a balloon, the tip of which balloon through a thread guide lying in the extension of the spindle axis 22 is determined, which is inclined to the spindle axis standing boom arm 21 is attached. The two threads are then guided into a suitable guide Traversing thread guide that can be moved up and down in the vertical direction 23 fed to wound on the take-up reel A. to become the one against that against their outer coat adjacent protective pot 24 is rotated, the in for a double wire twist spindle with internal winding is rotated in the usual way.

Claims (5)

1. A process for continuously making a twist with little tendency to snarl,
   characterised in that

   (a) a twisting procedure is made directly to follow an air spinning or OE spinning procedure, in an uninterrupted sequence of processes,

   (b) the time interval between ending the spinning phase and ending the twisting phase is selected to be < 1 second, and

   (c) the tensile force of the thread at the point of ending the spinning phase and the tensile force of the thread at the point of ending the twisting phase are adjusted to approximately the same value.
2. A process for continuously making a twist with little tendency to snarl, characterised in that

   (a) a twisting procedure is made directly to follow an air spinning or OE spinning procedure, in an uninterrupted sequence of processes,

   (b) the time interval between ending the spinning phase and ending the twisting phase is selected to be < 1 second, and

   (c) the tensile force of the thread at the point of ending the twisting phase is adjusted to a value > 70% of the tensile force of the thread at the point of ending the spinning phase.
3. A process according to Claim 1 or 2, characterised in that a time interval of < 0.5 second is established between ending the spinning phase and ending the twisting phase.
4. A process according to Claim 3, characterised in that a time interval of < 0.1 second is established.
5. A process according to Claim 1 or 2, characterised in that the spinning/twisting delivery rate is adjusted, as a function of the twist to be made, to the following values: International count tex Range of delivery rate in m/min 20/2 50 x 2 100-200 50/2 20 x 2 60-170 70/2 14 x 2 40-140

Images