EP1058745B1 - Method for air-bubble texturing endless filament yarn, yarn finishing device and its use - Google Patents

Description

Technical field

The invention relates to a method for air-blast texturing of continuous filament yarn with an air-jet texturing nozzle with a continuous yarn channel at one end the yarn is fed and at the other end the textured yarn is removed and compressed air is fed into the yarn channel in a central section and in one expanding acceleration channel the blast air jet accelerates to supersonic and the loop yarn with a high transport speed of preferably over 600 m / min is generated, the air blowing texturing line by a delivery unit 1 am Beginning and a delivery plant 2 is limited at the end of the air finishing stage.

The invention further relates to a yarn finishing device with a texturing section, consisting of a supply plant 1 for the supply of the yarn, one Texturing nozzle and a delivery unit 2 after the texturing nozzle, the Texturing nozzle has a continuous yarn channel, at one end of which Yarn fed, and at the other end the textured yarn discharged and in a middle section of compressed air is fed into the yarn channel and in one a blown air jet with supersonic can be generated by the expanding acceleration channel.

State of the art

The invention is based on an air bubble texturing according to WO97 / 30200. The finishing of continuous filament yarn has two main tasks. To the One is the textile, made from industrially produced filaments Character and textile properties are given. Second, should the yarn is refined with regard to specific quality characteristics of the end product very often cannot be achieved by products made with natural fibers are. A very important goal for industrially manufactured filaments or the yarns and fabrics produced from it, lies in the processing process to optimize. Optimizing means here. Conservation or increase certain quality criteria and lower production costs. production costs can be lowered in various ways. The most obvious way is the increase in throughput speed in a given production plant. A second possibility lies in procedural interventions that are not necessarily include an increase in throughput speed, but certain Ensure quality criteria even at high yarn throughput speeds.

The textile industry is one of the, especially in the case of continuous filaments most complex branches of industry, from the raw material to the finished surface product several independent industries and trades are involved. There is none the branches completely autonomous, rather it is a processing chain at each process change in one stage, the subsequent or possibly previous ones Levels can affect. But it is always open whether the end user does Product accepted or rejected after changes often through new process techniques in terms of quality characteristics. For some product sectors, In the filament spinning mill, in particular, the finishing of yarn is done using yarn finishing nozzles the most important section. The structural change from plain yarn to A textured loop yarn is caused solely by mechanical air forces. This creates an air flow in the supersonic area, as in the beginning mentioned WO97 / 30200 is shown. Have all known attempts demonstrated that the texturing effect when using e.g. hot air for the blowing air in the nozzle is hardly changed. The simplest explanation is that hot Compressed air suddenly expands and cools down at the same time. The warming effect of heated compressed air is resp. the corresponding cooling largely canceled.

DE-OS 38 23 538 shows a process for the production of PBT carpet yarn. It is a compression crimp, which is an integrated process within a Spin-draw texturing with transport speeds of over 1800 m / min is carried out. With the crimp, the yarn deformation becomes thermal supports this, in contrast to the air bubble texturing, in which the Air forces alone cause the deformation.

The US.PS 40 40 154 shows another example of a compression crimp with Use of hot steam. The compression crimp takes place inside the cylindrical Channel start. The yarn leaves the channel without tension. This is in conflict to the actual texturing, in which the generation of tension on the yarn on Exit from the nozzle is a measure of the quality of the texturing. texturing was previously often understood in the most general sense and not as a technical term.

Presentation of the invention

The invention has now been given the task of processing the Optimize the production of a loop yarn. Part of the job for that In particular, the process was without higher yarn transport speeds Allow loss of quality.

The method according to the invention is characterized in that the yarn between delivery plant 1 and delivery plant 2 by an upstream and / or downstream Yarn heating device is heated in such a way that between delivery unit 1 and Delivery unit 2 both the mechanical air intervention and the thermal intervention takes place.

• einem höheren Luftdruck sowie
• einer Wärmebehandlung vor und/oder nach der Texturierung.

With T311, FIG. 2 shows the texturing of the prior art in a purely schematic manner, as was assumed in WO97 / 30200. Two main nozzle parameters are highlighted. An opening zone Oe-Z ₁ and a butt front diameter DAs, starting from a diameter d of the nozzle yarn channel. In contrast, the texturing according to the teaching of WO97 / 30200 is shown at the top right with increased performance. It is very clearly recognizable that the values Oe-Z ₂ and D _AE are larger compared to the nozzle T311. The yarn opening begins before the acceleration channel in the area of the compressed air supply P, that is to say already in the cylindrical section. VO is called pre-opening. The dimension Vo greater than d is preferably selected. The essential statement in FIG. 2 lies in the diagrammatic comparison of the yarn tension Gsp (cN) according to curve T311 with Mach <2 and a texturing nozzle according to curve S 315 with Mach> 2. In the vertical of the diagram, the yarn tension is in cN. In the horizontal the production speed is Pgeschw. shown in m / min. Curve T 311 allows the yarn tension to collapse rapidly at a production speed of 500 m / min. arkennen. Above about 650 m / min. the texturing broke down. In contrast, curve S 315 shows that the yarn tension is not only much higher, but in the range from 400 to 700 m / min. is almost constant and also drops more slowly in higher production areas. Increasing the Mach number is one of the most important "secrets" for progress in increasing performance according to WO97 / 30200. It was completely surprising that the increase in performance was not at all exhausted with the special design of the acceleration channel. Two key findings made it possible, as it were, to open another door at significantly higher speeds with unchanged quality, namely the additional combination of:

• a higher air pressure as well
• a heat treatment before and / or after texturing.

Even if in practice not in the strict sense of strictly separate levels may be spoken, so there is a corresponding representation Reality very close. If a production speed with the new Invention at 1200 m / min. is assumed, then (in addition to the heat effect) a rate of 250 m / min. by increasing the pressure to 10 - 12 bar and additional 200 m / min. due to a further increase to 12 - 14 bar. After previous attempts, a further increase in performance is very good possible. With the pressure increase above 8 or 9 bar, nothing else becomes that Prerequisite created to increase the Mach number. This is especially so effective if the texturing nozzle is designed according to the teaching of WO97 / 30200. It can be assumed that even larger increases to 1500 m / min. and more are possible. According to previous attempts, the production speed is still completely open upwards. It was also interesting to observe that only the thermal action before and / or after the texturing nozzle already showed an increase in performance with all nozzles with M <2. The new invention has shown that there are causal connections between the increase the pressure, the Mach number, the yarn transport speed and the thermal Influence. With the effect of heat before texturing the Stiffness of the individual filaments reduced. The filaments can be warm Bend the state more easily with less energy, which is the main reason for this portion. With the effect of heat after texturing, the structural change in the Texturing carried out more perfectly. A possible explanation for the amazing The high effect of thermal treatment lies in the fact that it increases at the same time Yarn throughput speed the time for a possible cooling, as it were is halved. The heat effect is therefore more pronounced. For special advantageous embodiments, reference is made to claims 2 to 6.

The invention further relates to a yarn finishing device and is thereby characterized that between the two supplying plants, after the texturing nozzle, before the delivery unit 2 and / or before the texturing nozzle, after the delivery unit 1 one Yarn heater is arranged. For particularly advantageous embodiments of the Yarn finishing device is referred to claims 8 to 10. The The invention further relates to the use of a heat treatment before and / or after a texturing nozzle with Mach> 2 in the acceleration channel.

Brief description of the invention

die Figur 1

ein Übersichtsblatt des neuen Texturierprozesses;

die Figur 2

einen Vergleich einer Texturierdüse mit Mach > 2 und einer Texturierdüse mit Mach < 2;

die Figuren 3a bis 3e

den Stand der Technik in Bezug auf das Texturieren;

die Figur 4

eine edindungsgemässe Texturierstrecke;

die Figur 5a bis 5d

verschiedene Varianten für den Einsatz von Wärmebehandlungen;

die Figur 6

mögliche Leistungsstufen durch eine Kombination verschiedener Ausgestaltungesgedanken.

The invention is explained in more detail below with the aid of several exemplary embodiments. Show it:

the figure 1

an overview sheet of the new texturing process;

the figure 2

a comparison of a texturing nozzle with Mach> 2 and a texturing nozzle with Mach <2;

Figures 3a to 3e

the state of the art in relation to texturing;

the figure 4

a texturing section according to the instructions;

Figures 5a to 5d

different variants for the use of heat treatments;

the figure 6

possible performance levels through a combination of different design ideas.

Ways and implementation of the invention

• der gewünschte Qualitätsstandard und
• das Schlackern, das bei weiterer Erhöhung der Transportgeschwindigkeit zum Zusammenbruch der Texturierung führen kann.

In the following, reference is now made to FIG. 1, which shows a schematic overview in relation to the new texturing process. The separate process stages are progressively shown from top to bottom. Giatt yarn 100 is guided from above via a first guide unit LW1 at a given transport speed V1 to a texturing nozzle 101 and through the yarn channel 104. Via compressed air channels 103, which are connected to a compressed air source P1, highly compressed, preferably not heated, air is blown into the yarn channel 104 at an angle α in the transport direction of the yarn. Immediately afterwards, the yarn channel 104 is opened conically in such a way that a strongly accelerated air flow with supersonic, preferably with more than Mach 2, occurs in the conical section 102. The shock waves generate the actual texturing, as is described in detail in WO97 / 30200 mentioned at the beginning. The first section from the air injection point 105 into the yarn channel 104 to the first section of the conical extension 102 serves to loosen and open the plain yarn so that the individual filaments are exposed to the supersonic flow. Depending on the level of the available air pressure (9. 12 to 14 bar and more), the texturing either takes place within the conical part 102 or around the outlet area. There is a direct proportionality between Mach number and texturing. The higher the Mach number, the stronger the impact and the more intense the texturing. There are two critical parameters for the production speed:

• the desired quality standard and
• the slagging, which can lead to the breakdown of the texturing if the transport speed is increased further.

It means:

Th. Before. :

thermal pretreatment, possibly only with yarn heating or with hot steam.

G.mech. :

Yarn treatment with the mechanical effect of a compressed air flow (supersonic flow).

Th. After. :

thermal aftertreatment with hot steam (possibly only heat or hot air).

D:

Steam.

PL:

Compressed air.

The production speed could increase with additional thermal treatment at 1500 m / min. without breakdown of texturing and without slagging be increased, the limit being given by the existing test facility was. The best texturing qualities could go far beyond the product speed 800 m / min. be achieved. Surprisingly, the inventors two completely new quality parameters have been discovered, albeit the ones above mentioned regularity (higher Mach number = stronger push = more intensive Texturing) could only be confirmed in all experiments. They discovered On the one hand, parameters are located upstream and / or downstream of the texturing Heat treatment, and on the other hand in an increase in Mach number by increasing the air pressure and the corresponding design of the acceleration channel.

a) Thermal aftertreatment or relax

An expert assesses an important quality criterion in texturing Hand of the thread tension of the yarn emerging from the texturing nozzle, which is also recognized as a measure of the intensity of the texturing. The thread tension stands on the textured yarn 106 between the texturing nozzle (TD) and one Delivery plant LW2 on. In this area, between the texturing nozzle (TD) and the delivery unit LW2, was now a thermal treatment on the under tension Yarn performed. The yarn was heated to approx. 180 ° C. Either with a hot pin or heated godets like with a hot plate (contactless) first attempts have already been successfully completed, with the surprising result that the quality limit in terms of Transport speed could be increased massively. Currently is suspects that the thermal post-treatment described involves a fixation and at the same time has a shrinking effect on the textured yarn, and thereby supporting the texturing.

b) Thermal pretreatment

To the even greater surprise, the thermal pretreatment has likewise a positive effect on the texturing process. Here is a combinatorial Effect between shrinkage and yarn opening in the section between the Air injection point in the yarn channel and the first section of the conical extension, in the area of supersonic speed, cause of success. By warming up the yarn, the stiffness is reduced, so the prerequisite for loop formation in the texturing process is improved. Here too tests with both hotplate and hotpin as heat sources were successful be completed. That may also help with thermal Pretreatment of the yarn has a negative cooling effect due to the air expansion in the texturing nozzle, and therefore texturing when the yarn is heated be improved. With the very high transport speed, part of the Preserve warmth in the yarn itself up to the area of loop formation.

If exposure to a processing medium, be it hot air, Superheated steam or another helssen gas, is then maximized prefers the additional thermal process steps locally or on running yarn shortly or immediately one after the other. The Procedural interventions are not isolated in this way, but are in one Interaction between two suppliers combined. This means, that the yarn is held only at the beginning and at the end, in between takes place both the mechanical air intervention as well as the thermal intervention take place. The thermal Treatment is done on that, still under those mechanically generated by the compressed air Tensions in the flames or in the yarn carried out.

Figure 2 gives an overview of the yarn tension (Gsp) and the production speed. In the lower left part of the picture is the result with a T 311 nozzle shown, wherein the yarn was heat treated with T311 + Th. The dash-dotted Lines T311 + Th are only the result of touch attempts. In the upper part of the picture an S315 nozzle is used with an acceleration channel for Mach> 2. The air pressure used for the texturing is not entered in the two curves. The dash-dotted curve S 316 + Th shows above all the great influence the effect of heat. Since there are a variety of yarn qualities and yarn titers, it was not yet possible to determine the corresponding relations exactly. After the Experience in textile technology is only possible in actual production use.

However, FIG. 2 clearly shows the stages of the increase in performance through the different combinations. A PA 78f51, Core 10%, effect 30% and a pressure of 9 bar are used.

Figures 3a to 3e show the typical solutions of the prior art with in accordance with the known symbol representation, wherein in the figure 3d examples of textured yarns and with the figure 3e reproduced a classic texturing nozzle is. 3a shows schematically the known single or parallel processing of FOY yarn. Figure 3b the parallel processing of FOY and POY yarn. The figure 3c the processing of POY yarn with core and fancy yarn. In the nozzle shown it is a T 311 nozzle.

FIG. 4 schematically shows the use of the new one in accordance with FIG. 3 Texturing solution. In contrast to the representation in Figure 1 are for thermal treatment, the so-called hotplate (H.plate) is represented non-contact heating channels, as shown in Figures 3b and 3c. The whole air finishing stage is according to Figure 1 in Figure 4 with LvSt designated. FIG. 4 shows both a thermal pretreatment 120 and one thermal aftertreatment 121 shown, with the most important process data, about air pressure, temperature and yarn speeds. H.plate means hot plate and H.pin means hot pin. In front of the texturing nozzle 101 is another HemaJet 123 yarn moistening arranged. After the air finishing stage, that will be Yarn mostly warped by a few percent (1 - 2%) or a stretching process subjected. The yarn is then passed through another heater 122 led, which can now also be a steam chamber. Will at one point Hot steam used for thermal treatment, then it can be out It is advisable for economic reasons, the other heating points also with hot steam train. In the table, the thread speeds are at the marked Supplying plants (W) listed as an example.

Figures 5a to 5d show the use of the so-called heated and driven Godets for thermal treatment with some important uses. The temperamabe in the godet shows whether it is a heated position. Analogously, one can be used for all representations Hotplate or a continuous steam chamber according to the invention can be used.

Block 500

zeigt den Stand der Technik mit einer Texturierdüse T 311 gemäss Figur 3e, 9bar, 500 m/min.

Block 150

zeigt eine Texturierdüse S 315. Versuche haben gezeigt, dass mit zusätzlichem thermischem Prozess der Block 150 auch mit einer Düse T311 noch möglich ist. Dies ist mit strichpunktiertem Pfeil angedeutet.

Block 100

zeigt zusätzlich einen Set Heater.

Block 250

zeigt zusätzlich eine thermische Nachbehandlung (Figur 5a) mit 10 - 12 bar und mit Hot plate C/E/ATY; SET.

Block 200

zeigt zusätzlich eine thermische Vorbehandlung (Figur 5d) mit 12 - 14 bar mit Hot plate C/E/ATY; SET.

FIG. 6 diagrammatically illustrates the speed increase areas very roughly, the possible increase in production speed being shown in each case for the identical texturing quality. The blocks shown represent different combinations for the texturing process from bottom to top. Dispositives corresponding to FIGS. 1, 4 and 5 were used in the upper half of the figure, with the increase in performance or production speed achieved, while maintaining a certain, predetermined yarn quality.

Block 500

shows the prior art with a texturing nozzle T 311 according to Figure 3e, 9bar, 500 m / min.

Block 150

shows a texturing nozzle S 315. Tests have shown that with an additional thermal process, block 150 is also possible with a nozzle T311. This is indicated by a dash-dotted arrow.

Block 100

also shows a set heater.

Block 250

additionally shows a thermal aftertreatment (FIG. 5a) with 10-12 bar and with hot plate C / E / ATY; SET.

Block 200

additionally shows a thermal pretreatment (FIG. 5d) with 12-14 bar with hot plate C / E / ATY; SET.

The performance increases according to blocks 250 and 200 were of constant quality only with a texturing nozzle according to WO97 / 30200, i.e. with more than Mach 2 in Acceleration channel can be implemented. Block 250 sets the higher pressure as well as one Heat treatment ahead. Block 200 presupposes all proposed measures. Block 150 can optionally be equipped with a T 311 nozzle and a thermal one Treatment can be achieved.

The invention further relates to the use of at least one or two heat treatments before and / or after a texturing nozzle with Mach> 2 in the Acceleration channel.

Claims (10)

1. Process for air jet texturing continuous filament yarn (100) with an air texturing jet (101) with a continuous yarn channel (104), at one end of which the yarn (100) is fed and at the other end of which the textured yarn (106) is discharged and in a central portion compressed air (PL) is fed into the yarn channel (104) and in a widening acceleration passage (102) the air jet is accelerated to supersonic speed and the loop yarn (106) is produced at a high conveying speed preferably above 600 m/min, the air jet texturing section (LVST) being limited by a first feed unit at the start and a second feed unit at the end of the air processing stage (LVST), characterised in that the yarn is heated between first feed unit and second feed unit by an upstream and/or downstream yarn heating device (120, 121) in such a way that both the mechanical air action and the thermal action takes place between first feed unit and second feed unit.
2. Process according to claim 1, characterised in that compressed air (PL) is fed into the yarn channel at a feed pressure of more than 8 bar, preferably 10 to 14 bar or higher, and the air jet is accelerated to supersonic speed greater than Mach 2.
3. Process according to claim 1 or 2, characterised in that the yarn is heated to above 90°C directly after and/or before texturing.
4. Process according to any one of claims 1 to 3, characterised in that heating takes place before and/or after texturing by "hotplate" (H.plate) or "hotpin" (H.pin).
5. Process according to any one of claims 1 to 3, characterised in that the thermal effect of a hot gaseous medium, preferably superheated steam, is exploited for the thermal yarn processing, the thermal yarn processing taking place in a processing element (101) with a closed tunnel steam chamber (41), preferably with a steam feed channel of large cross-section.
6. Process according to any one of claims 1 to 5, characterised in that the conveying speed for the texturing is 800 to 1,500 m/min or more.
7. Yarn finishing device with a texturing section (LVST), consisting of a first feed unit for the supply of the yarn (100), a texturing jet (101) and a second feed unit downstream from the texturing jet (101), the texturing jet (101) having a continuous yarn channel (104), at one end of which the yarn (100) is fed, and at the other end of which the textured yarn (106) is discharged and in a central portion compressed air (PL) is fed into the yarn channel and a supersonic air jet can be created in a widening acceleration channel (102), characterised in that a yarn heating device (120, 121) is arranged between the two feed units, downstream from the texturing jet (101), upstream from the second feed unit and/or upstream from the texturing jet (101), downstream from the first feed unit.
8. Yarn finishing device according to claim 7, characterised in that it has a hotplate (H.plate) or hotpin heater (H.pin) for the heat processing or a processing element (41) with a tunnel steam chamber with a yarn inlet/yarn discharge aperture for free passage of the yarn and a steam feed channel, preferably of large cross-section.
9. Yarn finishing device according to claim 8, characterised in that the processing element (41) and/or the tunnel steam chamber is formed in two parts and preferably as a closed jet, the tunnel steam chamber being formed approximately identically in the two parts and approximately symmetrically in the two jet halves.
10. Yarn finishing device according to any one of claims 7 to 9, characterised in that the use of heat processing takes place upstream and/or downstream from a texturing jet (101) at Mach >2 in the acceleration channel (102).

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