ITUB20152307A1 - METHOD AND DEVICE FOR THE PRODUCTION OF A BLOODY AND THREADED THREAD THEN OBTAINED - Google Patents

Description

METHOD AND DEVICE FOR THE PRODUCTION OF A FLAMED WIRE AND THIS OBTAINED WIRE

DESCRIPTION

FIELD OF THE INVENTION

The present invention relates to the sector of the production of threads and yarns. More particularly, embodiments described herein relate to improvements to methods and devices for producing slub yarns.

ANTERIOR ART

In the textile sector there is a continuous search for new yarns to obtain particular technical and aesthetic effects. It is known in textile technology to produce so-called "flamed" fancy yarns, in which, through a suitable flaming device or flaming unit, accumulation areas, i.e. irregularities in the thickness of the yarn itself, are inserted into the yarn. Examples of flaming devices are described in EP0299131, US6820405, US43686I2.

Usually, a slub yarn, previously subjected to texturization, is coupled to an elastomeric yarn to obtain a composite fancy yarn.

There is still a need to develop better quality slub patterned yarns suitable for giving innovative characteristics to knitted or weft fabrics made with these yarns.

SUMMARY OF THE INVENTION

According to a first aspect, the invention relates to a method for the production of a fancy yarn. In embodiments described here, the method comprises the step of feeding a first yarn and subjecting it to a false twist drawing and texturing process. The method also comprises the step of feeding a second yarn and subjecting it to a false twist drawing and texturing process. The first drawn and textured yarn is then fed to a first flaming unit to form accumulation or flaming areas on the first yarn. Similarly, the second stretched and textured yarn is fed to a second flaming unit to form accumulation or flaming areas on the second yarn. Subsequently, the first yarn, the second yarn and a core yarn are joined together to form the fancy yarn. In advantageous embodiments, the joining or joining of the three components (first slub yarn, second slub yarn and core yarn) takes place in a single joining device. The joining device may be or comprise an air interlace jet.

According to a further aspect, the invention relates to a device for the production of a slub yarn, comprising in combination a first draft and texturizing group with false twist, to subject a first yarn to draft-texturing, and a second drafting group and false twist texturing, to subject a second yarn to stretch texturing. Downstream of the drawing and texturing units, the device comprises a first slaming unit for the first drawn and textured yarn, and a second slaming unit for the second drawn and textured yarn. Downstream of the first and second slaming units there is a device for joining the first yarn of the second yarn, into which a core yarn is also fed.

According to yet another aspect, the invention relates to a fancy yarn comprising in combination a core yarn, a first stretched, textured and slub yarn, a second stretched, textured and slub yarn joined together.

BRIEF DESCRIPTION OF THE DRAWINGS

A better understanding of the invention and its many advantages will be obtained from the following description of some embodiments, with reference to the attached drawings, in which: the

Fig. 1 shows a basic diagram of an embodiment of the method described here; there

Fig.2A shows a section of a machine comprising a plurality of devices according to an embodiment; there

Fig.2B shows an enlargement of a portion of Fig.2A;

Fig.3 shows a diagram of a flaming unit in an embodiment; the

Figs.4A-4D show an operational sequence of the flaming unit of Fig.3; there

Fig.5 shows a diagram of a flaming unit in a different embodiment; there

Fig.6 shows a photograph of a slub yarn obtained with a conventional process; and the

Fig.7 shows a photograph of a slub yarn obtained with a process as described here.

DETAILED DESCRIPTION OF FORMS OF CONSTRUCTION

The following detailed description of exemplary embodiments refers to the accompanying drawings. The same reference numerals in different drawings identify the same or similar elements. Also, the drawings are not necessarily to scale. Furthermore, the detailed description that follows does not limit the invention. Rather, the scope of the invention is defined by the attached claims.

Reference throughout the description to "an embodiment" or "the embodiment" or "some embodiment" means that a particular feature, structure or element described in connection with an embodiment is included in at least one embodiment of realization of the described object. Therefore the phrase "in an embodiment" or "in the embodiment" or "in some embodiment" at various points along the description does not necessarily refer to the same or the same embodiments. Furthermore, the particular features, structures or elements can be combined in any suitable way in one or more embodiments.

Fig. 1 shows a basic scheme of the method according to some embodiments of the invention. For the production of a FF composite fancy yarn, two starting yarns or threads are used, indicated with FI and F2. The yarns FI and F2 can be supplied in reels B 1 and B2 which are gradually unwound to feed the yarns FI and F2 to the processing units of the device, indicated as a whole with 1 in the diagram of Fig.l.

In some embodiments, each of the yarns F1 and F2 is subjected to a preliminary false twist drafting and texturing operation in a machine section indicated with 3. In section 3 a first false twist drafting and texturing unit is provided. for the first yarn FI, indicated as a whole with 2A. In section 3 there is also a second false twist drawing and texturing unit 2B for the yarn F2.

In some embodiments, in order to carry out the drafting and texturing operations with false twist, the first yarn F1 is fed through a first feeding unit 5, an oven or heater 7, a cooling zone 9, a false twist unit 11 , and finally through a second power supply unit 13.

Similarly, the second yarn F2 can be fed through a respective first feed group 15, a second oven or heater 17, a second cooling zone 19 and a second false twist unit 21 to finally be introduced into a respective second group power supply 23.

In the diagram of Fig. 1 the two ovens 7 and 17 are integrated in a single heating unit indicated as a whole with 8.

In a per se known manner, the yarn F1 can be subjected to drawing between the feeding unit 5 and the feeding unit 13. Each of the two feeding units 5 and 13 can comprise a pair of rollers placed side by side and pressed, in order to defining a passage groove for the yarn FI. One at least of the two rollers of each feeding group 5, 13 can be motorized, while the other can be idle. The peripheral speed of rotation of the rollers of the feeding units 5 and 13 is selected in such a way as to impart to the yarn F1 the desired degree of drafting in the drafting and texturizing section with false twist 3. For example, the feeding unit 13 can be actuated to a peripheral speed of the rollers higher than that of the feeding unit 5 by a percentage comprised between L1 and 2.0.

Similarly, the yarn F2 can be subjected to drawing in the false twist drawing and texturing area 3, between the feeding unit 15 and the feeding unit 23. The feeding units 15 and 23 can be configured in a similar manner to the units 5 and 13. In some embodiments, the motorized rollers of the supply units 5 and 15 can be mounted on a common shaft, driven by a single motor. In other embodiments, the power supply units 5 and 15 can be associated with different motors, to impart different degrees of draft to the yarns F1 and F2. Similarly, the feeding units 13 and 23 can have motorized rollers mounted on the same shaft to be driven by a common motor, or driven by different motors to independently adjust the drawing percentage of the two yarns F1 and F2.

Downstream of the false twist drawing and texturing section 3 the device 1 has a first slaming unit 25, placed along the path of the first yarn F1, and a second slaming unit 27, placed along the path of the second yarn F2,

The two flaming units 25 and 27 can be made in a manner known per se, for example as described in the patent documents cited in the introductory part of the present description. A further embodiment of a flaming unit 25 or 27 will be described later with reference to Fig.3.

In a suitable position, for example in the region of the slaming units 25, 27 or downstream of them, a station 29 for unwinding a reel BE of an elastomeric yarn FE, intended to form the core yarn of the composite fancy yarn, can be provided. EF. The elastomeric thread FE can for example be made of Lycra® or any other suitable material.

The feeding paths of the yarns FI and F2 and of the elastomeric yarn FE are joined in a device for joining or joining the yarns FI, F2 and the elastomeric yarn FE. In some embodiments the joining device 31 comprises or consists of an air interlacing jet 31. In the air interlacing jet 31 the yarns FI, F2 and the elastomeric yarn FE are joined together by jets of compressed air, to obtain, at the outlet from the air interlacing jet 31, the composite fancy yarn FF, which is wound on a reel BF in a collection and winding station schematically indicated with 33, to which the fancy yarn FF is fed by a feeding assembly 35 which can comprise, in a manner similar to the assemblies 5, 13, 15, 23, a pair of rollers approached and pressed together, at least one of which can be motorized and the other idle. The peripheral speed of the rollers of the feeding unit 35 can be suitably controlled to introduce a further degree of draft or a relaxation in the fancy yarn FF before collection on the reel BF. In some embodiments, the feeding assembly 35 can be replaced by a heated roller, so-called godet. In this way, in addition to the feeding function, the heat setting of the FF fantasy yarn is also achieved. In some embodiments, an oil supply unit, indicated with 37, can be arranged along the path of the fancy yarn FF towards the collecting spool BF.

The composite fancy yarn FF therefore comprises a core yarn consisting of the elastomeric yarn FE to which two slub yarns FI and F2 are joined by means of the air interlacing jet 31.

The fancy yarns FI and F2 are advantageously and preferably multi-filament yarns, for example with a number of burrs comprised between 10 and 288,

In some embodiments the yarns F1 and F2 have a count between 15 and 550 Dtex.

The two yarns FI and F2 can be identical in terms of count and composition, or different in terms of count and / or composition.

In some embodiments, the yarns FI and F2 can be POY (pre-oriented yam or partially oriented yarn) or FDY (fully drawn yarn) yarns, independently of each other. The two yarns FI and F2 can be, independently of each other, made of polyamide (nylon), polypropylene, polyester, polybutylene terephthalate, or any other material, typically polymeric, useful for the production of yarns for the textile industry. for clothing, furniture, automotive or any other textile application.

Figures 2A and 2B illustrate an embodiment of a device which realizes the scheme of Figure 1. Like numbers indicate parts that are the same or corresponding to those described with reference to Fig. 1. More specifically, Figs 2A, 2B show a section according to a vertical plane, orthogonal to the longitudinal extension of a multiple machine comprising a plurality of devices I aligned with each other according to an orthogonal alignment with respect to the plane of the figure.

The paths of the yarns FI and F2 are partially superimposed in the image of Figs, 2A, 2B, in particular as regards the false torsion drawing and texturing section 3. In Figs.2A, 2B are therefore indicated, overlapping one another, the ovens 7, 17 united in the heating unit 8, the cooling zones 9 and 19 and the false twist units 11 and 21. Downstream of the latter, the two yarn paths FI and F2 are visible separately from each other. other, with the feeding groups 13, 23, the slaming groups or units 25 and 27, the single interlacing jet 31, common for the yarns FI, F2 and for the elastomeric yarn FE, and the single feeding group 35. Below this latter two superimposed collection groups 33 are indicated, which correspond to two adjacent devices 1 arranged according to the alignment of the machine, orthogonal to the plane of the figure.

As mentioned above, the flaming units 25 and 27 can be made in a per se known manner, for example as described in the patent documents cited in the introduction. Fig.3 illustrates a flaming group or unit according to a further embodiment. In this embodiment, the slaming unit 25, 27 comprises, for each device 1, or for each position of the multi-position machine of Fig. 2, a pair of guide members 41, 43 for the passage of the respective yarn FI or F2. The two guide members 41 and 43 are preferably fixed with respect to the structure of the device 1. Between them there is a yarn guide 45 movable with reciprocating motion according to the double arrow f45. For this purpose the yarn guide 45 can be connected to a toothed belt 47 which can be driven in reciprocating motion by a motor 49.

The yarn guide 45 moves along a path, straight in the example illustrated, which goes from an initial position shown in Fig. 3, up to a final position in which there is a chute 51 stationary with respect to the supporting structure. The yarn guide 45 in the position illustrated in Fig. 3 engages the yarn F1 or F2, guided along the guiding members 41 and 43 and moves it in its translational movement towards the position of the chute 51. Interacting with the latter, the yarn is released from the yarn guide 45 returning to a rectilinear position between the two guide members 41 and 43. The yarn guide 45 returns back to the initial position of Fig.3, where it grasps the yarn again and deviates its path as described above up to the chute 51.

This operation is schematically indicated in the sequence of Figs 4A to 4D.

The periodic lengthening of the path of the yarn between the guide members 41 and 43 and the subsequent release of the yarn itself causes the formation of accumulations of yarn, with the consequent generation of the flamed effect.

Fig. 5 illustrates a different embodiment of a flaming unit, 25, 27. In this embodiment, the flaming unit 25, 27 comprises, for each device I, that is, for each position of the multi-position machine of Fig .2, a pair of guide members 41, 43 for the passage of the respective yarn F1 or F2. The two guiding members 41 and 43 are preferably fixed with respect to the structure of the device I. Between them there is placed a wire guide 45 movable with reciprocating motion according to the double arrow f45. For this purpose, the yarn guide 45 can be connected to a toothed belt which can be driven in reciprocating motion by an electric motor, in a similar way to what is described with reference to Fig. 3 The yarn guide 45 is made symmetrical with respect to a vertical plane and cooperates with two slides 51A, 5IB, placed at the ends of the stroke performed by the yarn guide 45.

The operation of the flaming unit in this case is substantially the same as that of the flaming unit of Fig.3. However, in this case the yarn guide 45 performs a greater stroke in the two directions according to the arrow f45 to cooperate alternatively with the two opposite slides 51A and 51B.

Using a double slaming unit, as shown by way of example in Fig. 5, the textured yarn that passes through the slaming unit remains more taut and therefore more rigid, which can lead to better final results.

In the device 1 two flaming units 25, 27 which are identical or different from each other can be used. For example, a flaming unit can be made as in Fig.3 and the other flaming unit can be made as in Fig.5.

In addition, the flaming units 25, 27 can be controlled in the same or different way with respect to each other. In particular, the two flaming units can be made to operate with the same frequency or with different frequencies of the motion of the yarn guide 45 or of other movable flaming element. By adjusting the position of the slides 51, 51A, 51 B with respect to the position of the guiding members 41, 43, it is also possible to vary the strokes of the thread guide 45 and therefore the quantity of accumulated yarn.

It is therefore possible to regulate, even independently for the two yarns FI, F2, the frequency with which the accumulations are distributed on the yarn (depending on the operating frequency of the flaming unit), the quantity of each accumulation (which may depend on the stroke of the yarn guide 45) or both of these parameters.

By varying the operating parameters of the two slaming units 25, 27, a wide range of different FF fancy yarns can be obtained.

Similar adjustments can also be adopted on different flaming units, made for example as described in the prior art documents cited above.

A variability of the final result on the fancy yarn can also be obtained by changing the FI and F2 yarns. These can be the same or different from each other, for example by title, number of burrs and / or material. The yarns FI and F2 can also differ in physical characteristics imparted during the drawing and false twist process. For example, the two yarns F1, F2 can be subjected to different drawing percentages and / or to different texturing temperatures and / or to different twists.

By using different yarns it is possible to obtain particular chromatic effects, if the two yarns have different behaviors during the dyeing phase.

In general, the device and the method described here allow to obtain a wide range of flaming effects on the final fancy yarn and therefore provide a high production flexibility.

The combination, in the same interlacing jet, of an elastomeric thread FE with two yarns FI, F2 textured and subjected to flaming in separate flaming units 25, 27, surprisingly allowed to obtain particular effects on the final FF yarn. Fig. 6 shows a photograph of a slub yarn obtained with a process according to the prior art, with a single textured and slub yarn, combined with an elastomeric yarn. The obtained fancy yarn has a discontinuity of yarn accumulations, spaced from each other by areas with no accumulation. The result is a limited volume of yarn and poor quality.

Fig.7 shows a photo of an FF patterned yarn obtained with the procedure described above. By combining two textured and flamed yarns in the same interlacing jet, a fancy yarn of greater volume and better quality is obtained, with the possibility of varying the distribution of the yarn accumulations by modifying, for example, the working frequency of the two units of flaming 25, 27.

The two yarns FI, F2 separately worked in the slaming units 25, 27 interact with each other in the interlacing jet giving rise to a synergic effect of slaming on the finished yarn FF.

While the disclosed embodiments of the object illustrated herein have been shown in the drawings and fully described above with details and details in relation to several exemplary embodiments, those skilled in the art will understand that many modifications, changes and omissions are possible. without materially departing from the innovative teachings, from the principles and concepts set out above, and from the advantages of the object defined in the attached claims. Therefore, the actual scope of the innovations described need only be determined on the basis of the broadest interpretation of the appended claims, so as to include all modifications, changes and omissions. Furthermore, the order or sequence of any method or process step can be varied or rearranged according to alternative embodiments.

Claims (19)

METHOD AND DEVICE FOR THE PRODUCTION OF A FLAMED WIRE AND THIS OBTAINED WIRE CLAIMS 1. A method for producing a fancy yarn (FF), comprising the following steps: feeding a first yarn (FI) and subjecting it to a false twist drawing and texturing process; feeding a second yarn (F2) and subjecting it to a false twist drawing and texturing process; feeding the first drawn and textured yarn (FI) to a first flaming unit (25) and forming accumulation or flaming areas on the first yarn (FI); feeding the second stretched and textured yarn (F2) to a second flaming unit (27) and forming accumulation or flaming areas on the second yarn (F2); join the first yarn (FI), the second yarn (F2) and a core yarn (FE). Method according to claim 1, wherein the core yarn (FE) is an elastomeric yarn. Method according to claim 1 or 2, wherein the first yarn (FI), the second yarn (F2) and the core yarn (FE) are joined together in an air interlacing jet (31). 4. Method according to one or more of the preceding claims, wherein the first yarn (FI) is a multi-filament yarn. Method according to one or more of the preceding claims, wherein the second yarn (F2) is a multi-filament yarn. 6. Method according to one or more of the preceding claims, in which the first yarn (FI) and the second yarn (F2) have a count ranging from 15 to 550 Dtex. 7. Method according to one or more of the preceding claims, in which the first yarn (F1) and the second yarn (F2) are equal to each other. 8. Method according to one or more of claims 1 to 6, wherein the first yarn (FI) and the second yarn (F2) are different from each other. 9. Method as per claim 8, in which the first yarn (FI) and the second yarn (F2) differ in one or more of the following characteristics: yarn material, yarn count, yarn number of burrs, degree of drafting of the yarn, degree of yarn texturing, yarn twist. 10. Method according to one or more of the preceding claims, in which the first yarn (FI) and the second yarn (F2) are subjected to different flaming processes from each other, to generate different, preferably different, accumulations of yarn by frequency and / or degree of accumulation. 11. A device (1) for the production of a fancy yarn (FF), comprising in combination: a first false torsion drawing and texturing unit (2A); a second false twist drawing and texturing group (2B); a first flaming unit (25); a second flaming unit (27); a path for a first yarn (FI) through the first false twist drawing and texturing unit (2A) and through the first slaming unit (25); a path for a second yarn (F2) through the second false twist drawing and texturing unit (2B) and through the second slaming unit (27); a core wire feed path (FE); a joining device (31) of the first yarn (FI), of the second yarn (F2) and of the core yarn (FE), placed downstream of the first flaming unit (25) and of the second flaming unit (27). Device according to claim 11, wherein the joining device (31) comprises an air interlacing jet. 13. Device according to claim 11 or 12, at least one and preferably both said first flaming unit (25) and second flaming unit (27) have at least one adjustable operating parameter, preferably independently for the two flaming units. 14. Device as per claim 13, wherein said at least one flaming parameter is selected from: the flaming frequency; the amount of accumulation of fdata. 15. A fancy yarn (FF) comprising in combination a core yarn (FE), a first stretched, textured and slub yarn (FI), a second stretched, textured and slub yarn (F2) joined together. 16. Fancy yarn as per claim 15, wherein the core yarn (FE) is an elastomeric yarn. 17. Fancy yarn as per claim 15 or 16, wherein the first drawn, textured and slub yarn (FI) is a multi-filament yarn. 18. Fancy yarn according to one or more of claims 15 to 17, wherein the second stretched, textured and slub yarn (F2) is a multi-filament yarn. 19. Fancy yarn according to one or more of claims 15 to 18, wherein the first yarn (FI) and the second yarn (F2) are different from each other for one or more of the following parameters: yarn material; yarn count; number of yarn burrs; degree of texturization; degree of ironing; degree of twist; frequency of accumulation of yarn in the slubs; amount of yarn accumulation.