EP1200655B1 - Method for producing blended yarns - Google Patents

Abstract

The invention relates to a method for producing blended yarns. In a first sub-process (P1), an untreated yarn is spun and pre-drawn from synthetic fibres in a spinning machine at a first production speed (V1). In a second sub-process (P2), said untreated yarn is subsequently textured in a texturing machine at a second production speed (V2). Finally, in a third sub-process (P3), the textured yarn is entangled together with an elastic filament in a vortex machine at a third production speed (V3), to produce the end product. In said method, the second production speed (V2) of the second sub-process (P2) is adapted either to the first production speed (V1) of the first sub-process (P1), or to the third production speed (V3) of the third sub-process.

Description

The invention relates to a method for producing blended yarns according to the preamble of the independent claim.

Blended yarns are now produced in three different, independent sub-processes and in different operations. Each sub-process as such is set up for optimal speed. Of course, this affects not only the sub-process as such, but also the entire periphery around the sub-process. The process sequence begins with the spinning stretch of synthetic fibers. This spinning stretching takes place at a first, very high processing speed and is carried out on large plants in a spinning mill. Everything is geared towards large production. Each spinning machine has a large number of individual spinning positions. For this reason, the raw yarn produced is also wound onto large spinning reels of normally 30 kg yarn weight.

The texturer resp. Stretch-texturing process takes place in a separate plant, mostly in. a separate factory. Here, synthetic fiber raw yarn is pulled from the supplied 30 kg spools and textured in a known manner. Since the volume increases, texturing can only take place at a significantly slower second speed. To ensure that texturing is fast and productive enough, each texturing machine has a large number of texturing points. The textured yarn is then usually wound onto packages with a yarn weight of 5 kg. This process takes place in our own production facilities. The 5 kg yarn packages are then passed on.

In the third sub-process, the textured yarn is unwound from the 5 kg. Wraps and proportioned with elastane, lycra and similar fibers in an air swirling process. This process is always dependent on the quality of the textured yarn and the type of admixture, for example intermingling and the quantitative proportion of the fed fibers dependent. This third sub-process works with a third; usually even lower speed. So that this sub-process is productive enough, each admixing, for example, swirling machine has a plurality of admixing, for example swirling points. This also takes place in a separate and specially designed production facility.

The object of the invention is to change at least one of these three sub-processes so that at least two of the sub-processes can be combined.

This object is achieved by the invention specified in the patent claims. For this it is necessary that the sub-process of the plug-texturing is adapted either to the conditions and speeds of the spin-stretching or to the speed of the air entanglement with the elastic component.

An additional advantage of the invention is that at least one rewinding point from one reel to the next and thus also a source of error is eliminated.

Another advantage of the invention is that two previously separate production sites can be combined. Either texturing is carried out in the spinning mill directly after the spinning process or the texturing process is running immediately before and together with the Airtex process. As a result, there is no longer any need to transport yarn packages between two production sites.

• Figur 1 Prozessablauf vom Spinnen bis zum fertigen elastischen Garn nach Stand der Technik;
• Figur 2 Prozessablauf nach Variante 1 durch Zusammenfassung von zwei Teilprozessen;
• Figur 3 Prozessablauf nach Variante 2 durch Zusammenfassung von zwei andern Teilprozessen;
• Figur 4 Schema der Optimierung des Teilprozesses der Streck-Texturierung und
• Figur 5 Schema zur Strecktexturieren und Zumischen.

The invention is described below in connection with the drawings.
Show it:

• Figure 1 process flow from spinning to finished elastic yarn according to the prior art;
• Figure 2 process flow according to variant 1 by combining two sub-processes;
• Figure 3 process flow according to variant 2 by combining two other sub-processes;
• Figure 4 Scheme of the optimization of the sub-process of stretch texturing and
• Figure 5 Scheme for stretch texturing and admixing.

The process flow according to the prior art is shown in FIG. 1.

The production of a blended yarn begins with the spinning of a synthetic fiber raw yarn in the first sub-process P1. This raw yarn is produced in large quantities using known technology in known spinning machines. For this purpose, the raw yarn is spun from a granulate and stretched appropriately. Both are done on the same machine and mostly in the same operation. Such spinning machines work with a very high production speed V1. Each spinning machine has a large number of individual spinning positions. Since the production speed V1 is high, the take-off of the raw yarn for further use must also be appropriately equipped. Therefore, the raw yarn produced is also wound onto large spinning reels W1, normally weighing 30 kg each.

The spinning reels W1 are now transported to a texturing company T1. Here the raw yarn is drawn off from the spinning reels W1 and is now treated in tetexturing machines as a second sub-process P2. When texturing, the raw yarn gets a desired texture. The volume of the yarn increases considerably. To ensure that texturing is fast and productive enough, each texturing machine has a large number of texturing points. The texturing machines work with a second production speed V2 suitable for these machines. The textured yarn is then usually wound onto a second roll of W2, each with a weight of 5 kg. The second reels W2 are now transported to the next company T2.

In the subsequent third sub-process P3, the textured yarn is unwound from the 5 kg. Reels and proportionally provided with elastic fibers in an air swirling process. This third sub-process will be carried out at a third, usually even lower production speed V3. So that this sub-process is productive enough, each admixing machine, for example a vortexing machine, has a plurality of admixing points. In this case, an additional filament is drawn off from a fourth winding W3 and swirled together with the textured yarn at the mixing point to form the mixed yarn. It is obvious that this can be done using various methods known per se, such as air swirling, twisting, twisting and the like. At the end of this third sub-process, the finished elastic yarn is now placed on third packages of around 6 kg each Thread weight wound up. The second windings W2 and the third windings W3 can be the same, since the volume of the finished elastic yarn differs only slightly from the textured yarn only, although the weight of the yarn increases by the proportion of the elastic fibers.

In the new method in a first variant according to FIG. 2, the second subprocess P2 and the third subprocess P3 are now combined. This is done by adapting the second production speed V2 to the third production speed V3 to such an extent that both are identical. This makes it possible for a swirling point W1 to be connected directly to each texturing point T1 and for the finished elastic yarn to be wound up again. This means that the second transport T2 of the second reel W2 from the second sub-process P2 to the third sub-process P3 including unclamping, chucking and mounting on the elements of the following processing stage is omitted. It is obvious that production is possible more cheaply and at the same time there are no sources of error. It is also possible to dispense with an intermediate quality control after texturing. The configuration of the elements required for the second subprocess P2 is discussed in more detail in connection with FIG. 4.

In the new method in a second variant according to FIG. 3, the first subprocess P1 and the second subprocess P2 are now combined. This is done by adapting the second production speed V2 to the first production speed V1 to such an extent that both are identical. This makes it possible for a single texturing point T1 to be connected directly to each individual spinning position S1. The finished textured yarn is then wound up again. This means that the first transport T1 of the heavy spinning reels W1 from the first sub-process P1 to the second sub-process P2, including unclamping, clamping and winding onto the elements of the following processing stage, is omitted. Here, too, work steps such as mixing quality control can be omitted. The configuration of the elements required for the second subprocess P2 is discussed in more detail in connection with FIG. 4.

So that the second production speed V2 of the second sub-process P2 can be adapted to the first production speed V1 of the first sub-process P1, the second sub-process must be changed accordingly and equipped with the necessary means. This can be seen from FIG. 4.

The adaptation of the second production speed V2 is made possible by constructing a texturing machine from individually controllable texturing modules 4. This means that each texturing module 4 has its own regulation. In addition, it has to be compact, since it is to be arranged directly in front of the swirling point of the third sub-process P3 or directly behind the spinning point of the first sub-process P1. So that a texturing module 4 can be built sufficiently compactly, it is equipped with a heating section with its own special preheating 41, 42. The raw yarn, which comes directly from a spinning position of a spinning machine or from a spinning reel W1, passes through a yarn inlet 48 into a first heating device 41, where it reaches a first. Preheating temperature T1 is heated. The preheated raw yarn is then pre-drawn to a certain extent, whereupon it is heated to the full texturing temperature T2 using a second heating device 42. The fully warmed raw yarn now runs over a twist stop 43, through an actively cooled texturing section 44 to a false twist element 45. The twist generated by the false twist element 45 runs backwards to the twist stop 43. The texture is generated in the yarn. As a result of the active cooling of the yarn as it passes through the texturing section 44, which is designed as a cooling channel, the texture is frozen or fixed already during production by being cooled to a fixing temperature T3. The now textured yarn then arrives at an elasticity correction station 46, where it is brought to a selectable correction temperature T4. Then, for example, it passes via an oiler 47 either to the winding station on a second winding W2 or directly to the subsequent swirling point of the third sub-process P3. So that the second production speed V2 can be adapted sufficiently to the other subprocess P1, P3. Is it necessary that both drive, such as preheating, texturing heating and active cooling in the cooling channel of the texturing section 44 can be controlled individually for each texturing module 4. Special measures result from the measures briefly described below.
The pre-stretching can either be produced with two heating godets arranged one behind the other, which have different speeds and possibly different temperatures. But it can also be achieved with a stylus and a heating godet. The preheating and heating must be provided with sufficient power. This can be done, for example, by using heating godets, infrared heating, air nozzle heating, resistance contact heating and combinations thereof. Likewise, the cooling must be able to provide sufficient power and be able to transfer it to the yarn, whereby special attention must be paid to the fact that yarn must be cooled to the necessary temperatures during the full production speed during texturing. Not only air cooling is suitable for this, but also liquid cooling with and without direct contact with the yarn. Other special options are also provided so that the heat in the heated yarn can also be dissipated quickly enough from the cooling section. For example, such a cooling channel can be filled or rinsed with water, oil, refrigerant or liquid sodium or saline medium, a salt or salt mixture with a suitable melting temperature. Of course, the use of a coolant which evaporates in the temperature range between about 50 ° and 300 ° is particularly suitable. The latent heat or the resulting evaporation cold helps considerably to remove enough heat from the yarn to cool it down to the appropriate temperature within the texturing section 44. Thread tension control with measurement and control can be just as important. For this purpose, a sensor for monitoring the thread tension is arranged in the area of the texturing section 44 and its measured values are used to regulate the thread tension.

So that the individual stretch texturing module is precisely controlled in this third sub-process, it is recommended that the thread temperature be measured as contactlessly as possible, at least in the area of the false-wire organ 45. From these measured values, heating and cooling are regulated as simultaneously as possible by online evaluation. This is essential so that the adjusted second production speed V2 can be maintained. The more precise the temperature control, the better the adaptation to the previous or subsequent sub-process.

FIG. 5 shows schematically a combination of the second subprocess P2 with the third subprocess P3 in connection with a single stretch texturing module 4. In addition to the embodiment according to FIG. 4, the additional filament is now mixed in from the fourth winding W4 after the directly after the withdrawal from the texturing section, as the elasticity correction station 64 in the third sub-process P3. In other cases, this can be done by swirling, twisting or twisting. Because of the individual adaptability of the speed of the individual texturing module, the production speeds V2 and V3 of the two sub-processes P2, P3 can be precisely coordinated and optimized.

Such a mixed yarn can be produced by admixing a synthetic filament, for example one with special elastic properties or else a filament made of cotton, wool and others.

The combination of the second and third subprocesses P2, P3 according to the invention can be expanded by a further subprocess without spools in between. It is thus possible to feed the mixed yarn produced directly to a circular knitting machine which can adapt these individual process speeds to one another under the conditions mentioned and with the means mentioned.

Claims (15)

1. A method for producing blended yarns wherein in a first sub-process (P1) in a spinning machine with a first production speed (V1) a raw yarn of artificial fibres is spun and pre-drawn, whereupon in a second sub-process (P2) in a texturing machine at a second production speed (V2) the raw yarn is drawn and textured, whereupon in a third sub-process (P3) in an admixing at a third production speed (V3) the textured yarn whilst supplying an elastic filament is admixed into the end product,
   characterised in that
   the second production speed (V2) of the second sub-process (P2) is either adapted to the first production speed (V1) of the first sub-process (P1) or to the third production speed (V3) of the third sub-process.
2. A method according to claim 1, characterised in that the raw yarn after the first sub-process (P1) is wound onto a spinning winding, whereupon the raw yarn is pulled from the spinning winding and in a second sub-process (P2) in a texturing module (4) of the texturing machine is textured and directly led to an admixing location (5) of the admixing machine whilst supplying the additional filament as a third sub-process (P3), whereupon the finished blended yarn is wound onto a yarn winding, wherein the second and the third production speeds are identical.
3. A method according to claim 1, characterised in that the raw yarn at the end of the first sub-process (P1) from a spinning location of the spinning machine is led directly to an individually controllable texturing module (4) of the texturing machine for the second sub-process (P2), whereupon the textured yarn is wound onto a textured yarn winding (W12), whereupon for the third sub-process (P3) the textured yarn is pulled from the textured yarn winding (W12) whilst supplying a filament (F4) to be admixed to the admixing as a third sub-process (P3) and subsequently the finished blended yarn is wound onto a yarn winding (W5) wherein the first and the second production speeds (V1, V2) are identical.
4. A device for carrying out the method according to one of the patent claims 1 to 3, with a texturing machine which comprises a number of texturing modules (4) with in each case a yarn run-in (48), a heating path, a texturing path (44) and a yarn run-out (49), wherein the texturing path (44) is arranged between a twist stop (43) and a false twist element (45), characterised in that each texturing path (44) comprises a cooling channel with an active cooling and that each texturing module (4) is individually controllable with respect to the heating temperature of the heating path (T1, T2), the cooling temperature (T3) of the cooling channel and the run-through speed of the yarn.
5. A device according to claim 4, characterised in that the heating path comprises a first pre-heating (41) and a second pre-heating (42) with a pre-drawing lying therebetween.
6. A device according to claim 4, characterised in that the first pre-heating (41) comprises an infra-red heating, an air-nozzle heating or a resistance contact heating and the second pre-heating (42) comprises a heating galette.
7. A device according to claim 4, characterised in that the first and the second pre-heating (41, 42) are heating galettes.
8. A device according to claim 4, characterised in that the active cooling of the texturing path (44) of each texturing module (4) is an air cooling or a fluid cooling with direct yarn contact with the coolant.
9. A device according to claim 4, characterised in that the active cooling of the texturing path (44) of each texturing module (4) comprises a cooling channel, wherein the cooling channel is coolable by way of liquid or gaseous coolant.
10. A device according to claim 4, characterised in that the active cooling of the texturing path (44) of each texturing module (4) comprises a cooling channel, wherein the cooling channel is coolable by way of a salt-containing medium.
11. A device according to claim 4, characterised in that the active cooling of the yarn is effected by way of evaporation heat of a coolant.
12. A device according to one of the claims 4 to 11, characterised in that a thread temperature sensor is arranged in the region of the texturing path (44), whose readings are used for controlling for the active cooling.
13. A device according to one of the claims 4 to 11, characterised in that a sensor for monitoring the thread tension is arranged in the region of the texturing path (44), whose readings are used for controlling the thread tension.
14. A device according to one of the claims 4 to 13, characterised in that the yarn run-in (48) is connectable directly to a spinning location of the first sub-process (P1) of a spinning machine.
15. A device according to one of claims 4 to 13, characterised in that the yarn run-out (49) is connectable directly to an interlacing location of the third sub-process (P3) of an interlacing machine.