EP1900864A2 - Process and device for continuously mercerising spun yarn - Google Patents
Process and device for continuously mercerising spun yarn Download PDFInfo
- Publication number
- EP1900864A2 EP1900864A2 EP07115878A EP07115878A EP1900864A2 EP 1900864 A2 EP1900864 A2 EP 1900864A2 EP 07115878 A EP07115878 A EP 07115878A EP 07115878 A EP07115878 A EP 07115878A EP 1900864 A2 EP1900864 A2 EP 1900864A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- threads
- yarn
- mercerising
- strip
- alkaline solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009992 mercerising Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000011282 treatment Methods 0.000 claims description 29
- 238000005406 washing Methods 0.000 claims description 25
- 239000012670 alkaline solution Substances 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000006386 neutralization reaction Methods 0.000 claims description 11
- 229920002678 cellulose Polymers 0.000 claims description 8
- 239000001913 cellulose Substances 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 7
- 238000005213 imbibition Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000000750 progressive effect Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000000693 micelle Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005470 impregnation Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 229920000742 Cotton Polymers 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Natural products CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 210000001520 comb Anatomy 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B7/00—Mercerising, e.g. lustring by mercerising
- D06B7/04—Mercerising, e.g. lustring by mercerising of yarns, threads or filaments
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
Definitions
- the variation in inclination of the axes of the deviating rollers 24 allows the progressive axial gauge to be generated between the 8-shaped spirals that wind on the drums 20 and allows the number of spirals that can be carried by the available length of the drums 20 to be varied, thus determining the length of the path of the strip of threads 1 and its treatment time with alkaline solution.
- the strip of threads 1 is discharged with the hydro-extraction and drawing device 27 after the mercerising reaction. It is shown in figure 4 with its essential components.
- the strip of mercerised threads 1 still imbibed with alkaline solution passes from idle deviating rollers 28 and reaches the hydro-extraction device 29 consisting of a motorised roller 30 against which two idle counter-rollers 31 are pressed, preferably made from polymeric elastic material.
- Such a roller 30 rotates at the linear speed of the strip of threads 1 fed, decreased by the expected percentage shrinkage for the mercerisation.
- the motorisation of the shafts of the drums 41A, B is also controlled with independent actuation, for example through an inverter, given that the various angular speeds of the mercerising device are synchronised to obtain and keep coherent speeds within the device.
- the strip of washed and neutralised threads 1 is then subjected to a drying and exsiccation stage, in the drying unit inside the container 60 shown in figure 7 in its essential components.
- the drying and exsiccation unit has an analogous structure to that of the treatment unit with alkaline solution.
- the strip of threads 1 is made to pass onto the surface of two rotary drums 61, heated with steam or with diathermal oil to suitable temperature.
- the strip of threads 1 is wound many times onto the hot surface of the drums 61 always with incomplete 8-shaped spirals.
- the deposit of the strip of threads 1 is regulated with the deviating rollers 62, totally analogous to the deviating rollers 24 of the container 5, also with a rotation axis oblique to the axes of the drums 61.
- the strip of threads 1 coming out from the exsiccation unit is then sent for the individual winding of each thread and does not require any particular operation to separate the threads 1 that make up the strip, since such threads have always kept their individuality.
- the winder 70 a series of reels 72 is produced that each contain one of the threads 1 that have been mercerised in the plant upstream.
- injector nozzles 12 in the imbibing device 8 which engage the threads 1 under treatment individually, injecting the alkaline solution under pressure, allows the mercerisation treatment to be completed in a time of around a tenth of a second and it does not require further reaction stages to achieve the desired result.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
Description
- The present invention refers to the mercerising treatment of cotton yarn to give them the desired characteristics for their end use to produce fabrics or other manufactured products. In textile technology the treatment of yarn with liquid reactants uses a large variety of processes, for the various types of fibres like cotton, wool, silk, linen and so on, with which the yarn is given the desired characteristics or undesired components that decrease its worth and its possibilities of use are removed from it. With reference to cotton, such treatment is typically mercerisation, but it can also concern other treatments like dyeing, bleaching and so on.
- In conventional industrial practice such treatment operations are generally carried out with discontinuous operations on discreet batches of yarn, which therefore must be suitably packed in reels or skeins, which after treatment must be unwound and repacked differently further on in the production line. Such discontinuous operations on the yarn are rather onerous and have problems due to the inconsistency in the quality of the product.
- The overriding tendency of technology development is therefore in the direction of continuous processing in the overall yarn production process. For continuous mercerising technology the Applicant is the owner of
European patent applications 1.369.519 ,1.369.520 and1.369.521 . In them it is foreseen to work many threads together, picking them up from their reels, bringing them together in an integral bundle and subjecting them together to the mercerising processing, separating them once again and winding them each in a reel. The contact between the bundle of yarn and the process fluids is carried out with a series of Venturi nozzles, in which the process fluids also act as driving fluid of the bundle of yarn in the contact apparatuses. From the aforementioned European patent applications it is possible to obtain further details on mercerising technology. - In the description of the present invention we refer to mercerisation, but explicitly stating that the system for continuously treating yarn according to the present invention can also have advantageous uses for different treatments to be carried out on yarn in textile technology.
- The mercerising treatment of cotton yarn improves its mechanical characteristics, improves it appearance, and enhances its absorption capacity and reactivity towards finishing products and the affinity towards dyes. In short, it consists of treating yarn with highly concentrated alkaline solutions followed by drawing and removal of the reactants with suitable washes. The treatment is carried out on individual fibres that make up the yarn in a semi-plastic state induced by the concentrated alkalis that imbibe them.
- In conventional technique the mercerisation is typically carried out on the yarn in skeins, prepared with a reeling stage, subjected to discontinuous mercerisation, and then washed, neutralised, dried, unwound and repacked in reels.
- In the prior art it has also been proposed to continuously treat yarn with mercerising solutions by first preparing the individual threads with winding in beams of hundreds of threads each. From such beams the threads are unwound in parallel, made to pass into a sequence of treatment baths, drawn by pairs of rollers and wound back up again. At the moment, such technical solutions have practically remained at the proposal stage due to the complications and the drawbacks that hinder its industrial practice. One of the requirements for industrial scale application of continuous mercerising techniques is the hourly productivity, in other words the ability to work a discreet number of threads simultaneously and with an acceptable speed, as productivity is linked to the product of these two parameters.
- The purpose of the present invention is to make a system for continuously treating yarn with process fluids, and specifically mercerisation, which allows the drawbacks of the systems used or proposed in the state of the art to be overcome.
- This purpose is accomplished according to the present invention with a mercerising process according to the more general definition of
claim 1 and, for preferred embodiments or possible variants,dependent claims 2 to 8. The present invention also makes it possible to make a device for continuously treating yarn, and in particular mercerisation, according to claim 9 and the claims dependent upon it. - The characteristics and advantages of the present invention for continuously mercerising yarn, and more generally for continuously treating it with process fluids, can be seen more clearly from the following description thereof, given as a non-limiting example, referring to its application to the mercerisation of cotton, according to the plant scheme illustrated in figure 1A. Figure 1B for the sake of greater clarity - transparently shows the perspective view of the apparatuses in which the overall mercerising treatment is carried out, for simplicity's sake omitting the initial creel and the final reel-winding frame.
- Figures 1A-B illustrate the general scheme of the system for continuously treating yarn with process fluids.
- Figure 2 and the detail of figure 2A illustrate the relevant details of the first device for imbibing the threads subjected to mercerisation. Figure 3, on the other hand, illustrates the essential details of the container in which the mercerisation reaction takes place. Figure 4 on the other hand, illustrates the details of the hydro-extraction and drawing device after the mercerising reaction. Figure 5 then illustrates the details of the
container 40 in which the drawing of the yarn and its first washing with water take place. Figure 6 illustrates the containers 40bis in which both the second washing and the neutralisation stages take place. Finally, figure 7 illustrates the details of thecontainer 60 in which the drying and dehydration stage of the mercerised threads takes place. - In the general scheme of figures 1A-B, the
yarn 1 to be treated is fed from a series ofreels 2 arranged in parallel on acreel 3. Thereels 2 yield a plurality ofthreads 1, which are kept separate and parallel during the entire process and along the entire sequence of mercerising apparatuses. In order to carry out the process and make the device according to the invention on an industrial scale the processing must be carried out on a congruous number ofparallel threads 1, at least of the order of a few tens of threads at once, unwound with a speed at least of the order of 5-10 m/sec. - The return of the
parallel threads 1 is carried out with the pair ofmain guide rollers 4 with horizontal axis, which rotate at controlled speed and that determine the linear flow rate of the threads being processed taken to the mercerising unit, operating as outlined above at a linear speed of at least 5-10 m/sec. - A relevant characteristic of the present invention lies in the operation of the treatment and in the structure of the mercerising reactor in which the treatment of the threads is carried out with sodium hydroxide alkaline solution. Such an operation is carried out in a closed parallelepiped-
shaped container 5. Inside the closedcontainer 5, in general shaped like a wardrobe that can be opened for the intervention of operators, it is possible to maintain a controlled atmosphere, just like for the other further containers foreseen in the unit. On its inside, the group ofparallel threads 1 is deviated and guided firstly withrollers 7 with horizontal axis and worked with radial grooves that allow the threads to be kept separate and spaced apart during the entire mercerising reaction. - The strip of parallel and
separated threads 1 is fed to a firstimbibing device 8 illustrated in greater detail in figure 2, which shows plan, front and side section views. It consists of animbibing plate 10 equipped withlongitudinal grooves 11 that are independent and have constant pitch, which guide thethreads 1 separately. The mercerising fluid consists of the alkaline solution, for example sodium hydroxide at 30° Be, and is sprayed on theplate 10 withsprayers 12 with nozzles at thegrooves 11 in which thethreads 1 run at a speed controlled by theinitial guide rollers 4. The top part of thegrooved plate 10 is protected with acover 13. - According to a preferred embodiment of the invention, at the entry of the strip of
threads 1 into the imbibing device 8 asealing device 15 is arranged. It consists of anelongated tank 16, fed with the same mercerising solution and kept at atmospheric pressure, with a lower slit that comes out onto the grooves that guide and contain the threads in movement from left to right in the drawing according to the arrows F. The liquid head of thetank 16 allows a first imbibition at atmospheric pressure of thethreads 1 and avoids the entry of air into the second treatment area with the pressurised solution. In this second area theplate 10 is worked with V-shaped grooves, whereas thecover 13 is provided with one ormore sprayers 12 consisting of a series ofpressurised injection micro-nozzles 18, shown in the detail of figure 2A and each arranged at eachindividual groove 11 crossed by a single thread. Eachsprayer 12 and thetank 16 are fed withfittings 17 from a general feeding duct, not shown in the figures, which takes the alkaline mercerising solution at constant pressure and at controlled temperature. - The temperature of the mercerising solution is kept at 30-35°C, whereas the injection overpressure is between 1 and 15 bars, preferably between 1.5 and 4 bars. Indeed, it has been found that the injection overpressure of the mercerising fluid causes a substantial increase in the mercerisation reaction kinetics, which can be attributed to a better exchange coefficient and a more efficient contact between the liquid phase and cellulose micelles, substantially accelerating the mercerising reaction. In conventional mercerisation techniques by immersion in baths or recipients at atmospheric pressure contact times of the order of minutes are required, whereas the technical solution according to the present invention allows such contact times to be drastically reduced, reducing them to the order of magnitude of 10 seconds.
- Again inside the
container 5, the strip ofthreads 1, after imbibition in thedevice 8, then passes onto the surface of tworotary drums 20, on which the strip ofthreads 1 is wound many times with incomplete 8-shaped spirals 21, whereas inside of them the mercerising reaction takes place between the imbibing solution and the cellulose. - The structure and the operation of the
rotary drums 20 and of the other elements inside thecontainer 5 is illustrated in greater detail in figure 3, in which they are shown in perspective view and transparently. Thedrums 20 are mounted parallel with substantially horizontal axis and they are equipped with a substantially smooth cylindrical surface. The incomplete 8-shaped spirals 21 are deposited on the surface of thedrums 20. The deposit of the strip ofthreads 1 is guided withrotary combs 22, made up of a series of grooved ceramic bushings mounted with constant pitch on a shaft, and with the deviatingrollers 24. The deviatingrollers 24 have a substantially smooth surface, they are mounted with oblique rotation axis with respect to the axes of thedrums 20 and they are equipped with means for varying their inclination. The inclination to the right or left of the axes of the deviatingrollers 24 allows the progressive axial gauge between the 8-shaped spirals that wind on thedrums 20 to be determined. Again with reference to figure 3, the whole of thethreads 1 in a strip enters into the rear part at themain guide rollers 4, passes theimbibing device 8, winds - starting from the right-hand drum 20 - with 8-shaped spirals that advance towards the front part of thecontainer 5, and discharges - from the left-hand drum 20 - through the hydro-extraction anddrawing device 27. In the path betweenimbibing device 8 to the hydro-extraction device 27 the mercerising reaction between the cellulose micelles of the yarn and the solution that imbibes the yarn itself takes place. - The variation in inclination of the axes of the deviating
rollers 24 allows the progressive axial gauge to be generated between the 8-shaped spirals that wind on thedrums 20 and allows the number of spirals that can be carried by the available length of thedrums 20 to be varied, thus determining the length of the path of the strip ofthreads 1 and its treatment time with alkaline solution. For example, with substantially "square"cylindrical drums 20, with a diameter and length of about 1000 mm, it is possible to wind 50-100 m of strip ofthreads 1 and to carry out reaction times within the range of 8-15 seconds, which corresponds to the time of complete "re-entry", in other words the time for completion of the reactions between the cellulose and the alkaline solution, which result in the shortening of the yarn by values of 10-20% according to the type of yarn and the original cotton. - In the space contained between the two
drums 20, i.e. in the free parts of thespirals 21 of the strip ofthreads 1, one or more series of further spray nozzles is arranged close to the surface of the drums themselves, to renew the contact between yarn and alkaline solution. - Such spray nozzles are placed on nozzle-carrying
rods 25 and are analogous to those that equip theimbibing device 8, but operating at lower pressure, and the position of a pair ofrods 25 thereof is shown as an example in figure 1A. - At the end of the path inside the
container 5 for treatment with alkaline solution, the strip ofthreads 1 is discharged with the hydro-extraction anddrawing device 27 after the mercerising reaction. It is shown in figure 4 with its essential components. The strip ofmercerised threads 1 still imbibed with alkaline solution passes fromidle deviating rollers 28 and reaches the hydro-extraction device 29 consisting of amotorised roller 30 against which twoidle counter-rollers 31 are pressed, preferably made from polymeric elastic material. Such aroller 30 rotates at the linear speed of the strip ofthreads 1 fed, decreased by the expected percentage shrinkage for the mercerisation. In the part of the strip ofthreads 1 between the last spiral around the left-hand drum 20 and thedevice 27 the so-called shrinkage of the threads therefore takes place. In the contact between said rollers the alkaline solution still present in the threads is hydro-extracted and to a large extent recovered. The whole of theroller 30 and the counter-rollers 31 also acts as a seal against the shrinkage of the strip of threads hydro-extracted by therotary drums 41A, B of the washing section arranged downstream, which operate at higher linear speeds than that of theroller 30. Such shrinkage generates the drawings of the mercerised yarn, tending both to recover the shrinkage undergone during the mercerisation step and to further stretch the threads of the strip, thus giving them the positive characteristics that derive from the mercerisation. - All of the motorisations of the shafts of the rotary members inside the
container 5, in other words thedrums 20, the rotary combs 22, the deviatingrollers 24 and theroller 30, are controlled with independent actuations, for example through inverters, and the various angular speeds are synchronised with each other to obtain and keep the linear speeds for thedrums 20 and the deviatingrollers 24 coherent with that of the strip ofthreads 1 being processed. The rotation speed of thecombs 22, on the other hand, is lower (2-10 revolutions per minute); it is carried out to limit the erosion phenomena of the ceramic bushes of which they consist. - According to a preferred embodiment of the invention, a
device 35 for capturing the ends of the threads that have broken is arranged at themotorised roller 30 of the hydro-extraction device 29. Indeed, there is greater probability of breaking at the drawing of the mercerised threads and, in this case, the ends tend to stick and wind onto theroller 30. - The
device 35, for example, can consist of asuction mouth 36 connected to asuction duct 37; the top edge of its suction slit 38 is made from polymeric material and is arranged to scrape the metallic surface of theroller 30. In this way, the possible end that winds onto the surface of said roller is stopped and sucked up by themouth 36. Alternatively, thedevice 35 for capturing the ends can be made with a rotary brush of bristles made from polymeric material that, mounted in the same position as themouth 36 and made to rotate at a high speed, clears theroller 30 of the possible ends that would otherwise wind onto its surface. - After passing into the
container 5 in which the contact is made between thethreads 1 in a strip and the alkaline mercerising solution, said strip is fed for washing with water. For example, the washing can be carried out in many stages with water in countercurrent and at decreasing temperature, according to methods already known in the field. - The first washing stage is carried out in the
container 40, illustrated in figure 5 with its essential components. In it the washing operation of the yarn treated with the alkaline solution and coming from thecontainer 5 takes place. The strip ofthreads 1 is guided and deviated by a series ofidle rollers 28 up to the rotarycylindrical drums 41A, B made from metallic material and with a smooth surface. The strip of threads is inserted and held between the surface of thedrums 41A, B and a series of idle cylindrical counter-rollers 42 that wrap around them and are kept pressed to grip said strip. At each passage under such counter-rollers the liquid contained by the strip of threads is thus squeezed out. Downstream of the counter-rollers 42 a series ofspray nozzles 44 of the washing water is inserted. The washing consists of an alternating sequence of imbibition and squeezing of thethreads 1 in a strip to remove the residues of the alkaline mercerising solution, thus discharging the strip of threads washed through the deviatingidle roller 28 arranged downstream of thedrum 41B. As already stated, in passing from theroller 30 of the squeezinggroup 29 to the contact betweendrum 41A and thefirst counter-roller 42 of the first washing unit in thecontainer 40 the yarn is drawn as a consequence of the different linear actuation speed of theroller 30 and of thedrum 41A, recovering the lost length through "shrinkage" and giving the definitive tension required to fully obtain the mercerising effects. - The second washing stage is carried out in the container 40bis shown in figure 6 in its essential components, having the same structure and operations as the previous one, apart from the drawing function and the direction of the thread arriving from the previous stage. Therefore, the same reference numerals have been kept for the components present in the container 40bis.
- The motorisation of the shafts of the
drums 41A, B is also controlled with independent actuation, for example through an inverter, given that the various angular speeds of the mercerising device are synchronised to obtain and keep coherent speeds within the device. - The strip of
threads 1 washed in the previous washing units is then subjected to neutralisation, for example with a diluted acetic or citric acid solution with pH of 2-2.5, inside the relative containers. In the embodiment illustrated here, again for illustrating and not limiting purposes, the neutralisation is shown in two stages: in the first neutralisation with acid is carried out, whereas in the second the final washing with water for greater purity is carried out. The neutralisation unit is totally analogous to the washing units and operates according to the same general scheme, apart from that the washing operates with water whereas neutralisation operates with acid solutions. It corresponds to the scheme of figure 6 in terms of its components and the path of the strip ofthreads 1, feeding with a pressurised flow of a diluted acetic or citric acid solution to remove the alkaline residue from thethreads 1 of the strip that comes out from the previous washing. In the container 40bis of figure 6 the same reference numerals refer to components that are similar and have the same function as thecontainer 40 of figure 5. - In the bottom part inside the
container plates - The washing and neutralisation operations of the strip of
threads 1 are thus carried out inside thecontainers 40 and 40bis with S-shaped paths around thedrums 41A, B, on which an alternating sequence of imbibition and squeezing is carried out with the washing waters and with the acid solution, respectively. - The strip of washed and neutralised
threads 1 is then subjected to a drying and exsiccation stage, in the drying unit inside thecontainer 60 shown in figure 7 in its essential components. - The drying and exsiccation unit has an analogous structure to that of the treatment unit with alkaline solution. The strip of
threads 1 is made to pass onto the surface of tworotary drums 61, heated with steam or with diathermal oil to suitable temperature. The strip ofthreads 1 is wound many times onto the hot surface of thedrums 61 always with incomplete 8-shaped spirals. The deposit of the strip ofthreads 1 is regulated with the deviatingrollers 62, totally analogous to the deviatingrollers 24 of thecontainer 5, also with a rotation axis oblique to the axes of thedrums 61. The variation in inclination of the axes of the deviatingrollers 62 allows the progressive axial gauge between the 8-shaped spirals that wind onto thedrums 61 to be generated and allows their number to be varied, thus determining the length of the path of the strip ofthreads 1 and its time spent inside the exsiccation unit. The strip ofthreads 1 is discharged from the drying and exsiccation unit of thecontainer 60 with one or more pairs of dischargingrollers 64. Asuction hood 65 for the vapours developed during the course of the drying and exsiccation of the threads takes these vapours away. - The strip of
threads 1 coming out from the exsiccation unit is then sent for the individual winding of each thread and does not require any particular operation to separate thethreads 1 that make up the strip, since such threads have always kept their individuality. In the winder 70 a series ofreels 72 is produced that each contain one of thethreads 1 that have been mercerised in the plant upstream. - An important characteristic of the present invention is the way in which the threads make contact with the process fluids, alkaline solution, washing waters and neutralisation reagents, in the case of the mercerisation of cotton. The contact and the relative reactions are carried out by taking and feeding the process fluids directly to the single thread and avoiding the immersions in tanks or reactors of the prior art, which give a disadvantageous quantity ratio between the worked threads and the process fluids, In particular, the stage of reaction with the alkaline solutions takes place in a quite short time period. The use of the
injector nozzles 12 in theimbibing device 8, which engage thethreads 1 under treatment individually, injecting the alkaline solution under pressure, allows the mercerisation treatment to be completed in a time of around a tenth of a second and it does not require further reaction stages to achieve the desired result. - The mercerisation process described up to now allows significant advantages compared to the processes of the prior art. In addition to the advantage of carrying out the treatment with continuous operations, it is significant that the threads are worked as such and individually, without requiring them to firstly be joined in a package in an integral bundle, skeins or beams and later requiring their separation. The present invention allows work with good productivity since the strip of threads runs in the plant at a high speed going from the
reels 2 and ending at thereels 72 for collecting the mercerised product. - A further advantage lies in the small amount of fluids used and their greater yield, reducing the environmental implications. Processing with individual threads means that each of the
threads 1 being treated goes from areel 2 of index N in thecreel 3 and reaches areel 72 of index N. In the case in which a thread breaks along the path, in thewinder 70 the winding head of index N indicates the absence of thread: it is quite simple and easy to indicate such an event to thecreel 3 and consequently to thus automatically cause the relative end being fed to be cut and stop its winding head.
Claims (14)
- Process for continuously mercerising cellulose yarn comprising treatment of the yarn with alkaline solution, of drawing the yarn, the aqueous washing and the neutralisation of the residue of alkalinity still present in the yarn, starting from reels (2) of yarn and to produce reels (72) of mercerised yarn, characterised in that the process is carried out continuously on a strip consisting of a plurality of threads (1) kept separate and parallel along the entire mercerising apparatus, and in that the process fluids are fed directly to the individual threads (1) without immersion in treatment baths, said strip being moved from the reels (2) to the reels (72) at high speed.
- Process for mercerising yarn according to claim 1, characterised in that in the treatment with alkaline solution the strip of threads (1) is firstly subjected to imbibition with said solution in an imbibing device (8) and then passes onto the surface of rotary drums (20), being wound many times with incomplete 8-shaped spirals (21), thus determining with the number of spirals the length of the path of the strip of threads (1) and its treatment time with alkaline solution, whilst the mercerising reaction between the imbibing solution and the cellulose mixtures takes place inside of them.
- Process for mercerising yarn according to claim 2, characterised in that the imbibition of the threads (1) is carried out with a series of pressurised injector micro-nozzles (1), each arranged at a groove (11) crossed by a single thread (1).
- Process for mercerising yarn according to claim 3, characterised in that the injection overpressure in the micro-nozzles (18) is between 1 and 15 bars, and preferably between 1.5 and 4 bars.
- Process for mercerising yarn according to claim 2, characterised in that between the drums (20), in the free parts of the spirals (21) of the strip of threads (1), the contact between yarn and alkaline solution is renewed with further spray nozzles arranged on nozzle-carrying rods (25).
- Process for mercerising yarn according to claim 2, characterised in that at the end of the treatment with alkaline solution the strip of threads (1) is removed with a roller (30) rotating at the linear speed of the strip of threads (1) being fed, decreased by the expected percentage shrinkage for the mercerisation, thus allowing the threads to shrink in the part of free strip of threads (1) between the last spiral and the roller (30).
- Process for mercerising yarn according to claim 1, characterised in that the washing and neutralisation treatments are carried out by winding the strip of threads (1) with S-shaped paths about rotary drums (41A, B) on which an alternating imbibition and hydro-extraction sequence takes place with washing water and with acid solution, respectively.
- Process for mercerising yarn according to claim 7, characterised in that in passing from the roller (30) to the drum (41A) and the first counter-roller (42) of the first washing unit the drawing of the yarn takes place as a result of the different linear actuation speed of the roller (30) and the drum (41A).
- Device for continuously mercerising cellulose yarn comprising devices for treating the yarn with alkaline solution, for drawing the yarn, for aqueous washing and neutralisation of the residue of alkalinity still present in the yarn, starting from reels (2) of yarn and to produce reels (72) of mercerised yarn, characterised in that such devices operate continuously on a strip consisting of a plurality of threads (1) kept separate and parallel along the entire mercerising apparatus, feeding the process fluids directly to the individual threads (1) without immersion in treatment baths.
- Device for continuously treating yarn with process fluids according to claim 9, characterised in that the device for treating the strip of threads (1) with alkaline solution comprises an imbibing device (8) and two rotary drums (20), on which the strip of threads is wound many times with incomplete 8-shaped spirals (21), thus determining the length of the path along which the mercerising reaction between the imbibing solution and the cellulose micelles takes place.
- Device for continuously treating yarn with process fluids according to claim 10, characterised in that the two rotary drums (20) are provided with means for determining the gauge of the incomplete 8-shaped spirals, and for varying the number of spirals that can be carried by the available length of the drums (20), thus determining the length of the path of the strip of threads (1) and its treatment time with alkaline solution.
- Device for continuously treating yarn with process fluids according to claim 10, characterised in that the imbibing device (8) consists of an imbibing plate (10) equipped with independent longitudinal grooves (11), which separately guide the threads (1) on which the alkaline solution is sprayed with sprayers (12) with nozzles (18) at the grooves (11) in which the threads (1) run.
- Device for continuously treating yarn with process fluids according to claim 12, characterised in that at the entry of the strip of threads (1) into the imbibing device (8) a sealing device (15) is arranged consisting of a tank (16), fed with the same mercerising solution, with a lower slit that comes out onto the grooves (11) that gives a liquid head at the start of said grooves and a first impregnation of the threads (1).
- Device for continuously treating yarn with process fluids according to claim 11, characterised in that the means for determining the gauge of the spirals wound on the rotary drums (20) consist of deviating rollers (24) mounted with oblique rotation axis with respect to the axes of the drums (20) and equipped with means for varying their inclination, to generate the progressive axial gauge between the incomplete 8-shaped spirals that wind on the drums (20).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20061767 ITMI20061767A1 (en) | 2006-09-15 | 2006-09-15 | PROCEDURE AND DEVICE FOR CONTINUOUS MERCERIZATION OF TEXTILE YARNS |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1900864A2 true EP1900864A2 (en) | 2008-03-19 |
EP1900864A3 EP1900864A3 (en) | 2009-08-05 |
EP1900864B1 EP1900864B1 (en) | 2011-03-30 |
Family
ID=38829569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20070115878 Active EP1900864B1 (en) | 2006-09-15 | 2007-09-07 | Process and device for continuously mercerising spun yarn |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1900864B1 (en) |
CN (1) | CN101144235B (en) |
DE (1) | DE602007013500D1 (en) |
IT (1) | ITMI20061767A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20121361A1 (en) * | 2012-08-01 | 2014-02-02 | Reggiani Macchine Spa | MACHINE FOR MERCERIZATION OF YARNS |
ITMI20121360A1 (en) * | 2012-08-01 | 2014-02-02 | Reggiani Macchine Spa | MACHINE AND METHOD FOR THE MERCERISATION OF YARNS OR FABRICS |
CN113403764A (en) * | 2021-07-02 | 2021-09-17 | 台嘉蚌埠玻璃纤维有限公司 | Wire drawing machine capable of automatically flushing and flushing method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101525826B (en) * | 2009-03-10 | 2012-05-09 | 东华大学 | Method of yarn-bundle-shape continuous back-flow silkete |
CN110011226A (en) * | 2019-03-29 | 2019-07-12 | 北京理工大学 | Connecton layout |
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EP1369520A2 (en) | 2002-06-05 | 2003-12-10 | SAVIO MACCHINE TESSILI S.p.A. | Device for the continuous wet treatment of yarns |
EP1369519A2 (en) | 2002-06-05 | 2003-12-10 | SAVIO MACCHINE TESSILI S.p.A. | Apparatus and method for the continuous wet treatment of yarns, particularly for their mercerization under tension |
EP1369521A2 (en) | 2002-06-05 | 2003-12-10 | SAVIO MACCHINE TESSILI S.p.A. | Process and device for the continuous mercerizing of textile yarns |
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US2292629A (en) * | 1939-08-12 | 1942-08-11 | American Rayon Company Inc | Method for imparting finish to cotton yarn |
GB960150A (en) * | 1963-04-11 | 1964-06-10 | Inst Textilmaschinen | Improvements in or relating to apparatus for sizing warp threads |
GB1268376A (en) * | 1968-06-06 | 1972-03-29 | Stone Platt Crawley Ltd Former | Improvements relating to conveyors |
US3864949A (en) * | 1970-08-05 | 1975-02-11 | Kanegafuchi Spinning Co Ltd | Apparatus for continuously treating thread |
US3766581A (en) * | 1970-08-05 | 1973-10-23 | Kanegafuchi Spinning Co Ltd | Process for continuously treating thread |
DE4121593A1 (en) * | 1991-06-29 | 1993-01-07 | Croon Lucke Maschinen | Continuous yarn fluid treatment appts. - has two displaced synchronised rollers within container with min. recesses for yarn travel between and around them |
FR2739880B1 (en) * | 1995-10-13 | 1997-12-05 | Superba Sa | CONTINUOUS YARN DYING PROCESS, IN PARTICULAR BASED ON CELLULOSIC FIBERS WITH REACTIVE DYES, AND DEVICE FOR IMPLEMENTING THIS PROCESS |
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2006
- 2006-09-15 IT ITMI20061767 patent/ITMI20061767A1/en unknown
-
2007
- 2007-09-07 EP EP20070115878 patent/EP1900864B1/en active Active
- 2007-09-07 DE DE200760013500 patent/DE602007013500D1/en active Active
- 2007-09-14 CN CN2007101536904A patent/CN101144235B/en active Active
Patent Citations (3)
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EP1369520A2 (en) | 2002-06-05 | 2003-12-10 | SAVIO MACCHINE TESSILI S.p.A. | Device for the continuous wet treatment of yarns |
EP1369519A2 (en) | 2002-06-05 | 2003-12-10 | SAVIO MACCHINE TESSILI S.p.A. | Apparatus and method for the continuous wet treatment of yarns, particularly for their mercerization under tension |
EP1369521A2 (en) | 2002-06-05 | 2003-12-10 | SAVIO MACCHINE TESSILI S.p.A. | Process and device for the continuous mercerizing of textile yarns |
Cited By (5)
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ITMI20121361A1 (en) * | 2012-08-01 | 2014-02-02 | Reggiani Macchine Spa | MACHINE FOR MERCERIZATION OF YARNS |
ITMI20121360A1 (en) * | 2012-08-01 | 2014-02-02 | Reggiani Macchine Spa | MACHINE AND METHOD FOR THE MERCERISATION OF YARNS OR FABRICS |
WO2014020505A1 (en) * | 2012-08-01 | 2014-02-06 | Reggiani Macchine S.P.A. | Machine for yarn mercerization |
WO2014020503A1 (en) * | 2012-08-01 | 2014-02-06 | Reggiani Macchine S.P.A. | Machine and method for yarn or fabric mercerization |
CN113403764A (en) * | 2021-07-02 | 2021-09-17 | 台嘉蚌埠玻璃纤维有限公司 | Wire drawing machine capable of automatically flushing and flushing method |
Also Published As
Publication number | Publication date |
---|---|
EP1900864B1 (en) | 2011-03-30 |
CN101144235A (en) | 2008-03-19 |
DE602007013500D1 (en) | 2011-05-12 |
ITMI20061767A1 (en) | 2008-03-16 |
CN101144235B (en) | 2012-11-14 |
EP1900864A3 (en) | 2009-08-05 |
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