EP0210113B1 - Yarn package and method for making the same - Google Patents

Abstract

1. Large-size textile-yarn package, preferably for dyeing, characterized in that the yarn is at least one interlaced textured synthetic continuous yarn having between 40 and 200 interlacing per metre, the package being of the cross-wound straight-flank type of a crossing of between 20 degrees and 45 degrees and of a density of between 0.10 g/cm**3 and 0.30 g/cm**3, the diameter of the package being larger than 50 cm and its weight being greater than 5 kilograms.

Description

The present application relates to a presentation of textile yarn in the form of a winding, mainly for dyeing, and to its manufacturing process.

The filiform textile materials (ribbons, rovings, continuous or spun yarns of fibers), which will be designated by "yarn" in the following description, are generally offered in the form of windings such as cops, tubes, balls, cakes or sleeves, skeins, coils crossed on tube (rolls, sun coils, cheeses), cheek coils, coiled with conical or straight sides, etc.

The type of winding depends on the subsequent treatment to which it is subjected (spraying, dyeing, etc.).

These windings are most of the time presented as a superposition of layers of wires arranged parallel to each other, generally around a rigid central support, mainly of revolution. Around the latter, in order to have a good presentation of said windings on a support, the successive layers of turns of wire are returned under a tension which does not substantially exceed that of the internal layers. This winding mode, however, gives relatively little compressible coils.

Relatively soft windings intended for dyeing are also known. These small windings are either threaded on perforated tubes (or clarinets), or placed in bulk, in layers, in the dye autoclave; the coloring solution passing through the material by circulation of the bath, the material being, after dyeing, again wound on a support under a higher tension to allow easier later manipulation.

A winding must, moreover, be easily unwound so as not to cause disturbance in the processing operation in which it is used (warping, weaving, knitting, winding, quilling, tufting, etc.).

Due to their arrangement, the turns of the threads tend to slide one on the other, so that at the slightest shock the winding undergoes deteriorations which make it most of the time unusable, the sliding of the layers resulting in almost impossibility unwinding.

This fragility of the windings is more important when it comes to textured son windings. Indeed, the windings of textured yarns, in particular those intended for dyeing, must have a density making it possible to reconcile both good circulation of the dye bath and good reeling of the yarn after treatment. For dyeing in the form of bobbins, as a general rule, the textured thread coming from a primary bobbin is put into the form of soft windings of small dimensions, which are generally wrapped in sleeves to avoid the landslides of threads, threaded perforated tubes, or clarinets, contained in an autoclave, or else arranged in loose layers in said autoclave. After dyeing, the yarn is taken up again to be wound up in the form of hard coils for further processing treatments. These operations are long and costly, moreover the wire is handled several times between its presentation on primary reel and its winding for further processing and the dyeing process, is not economical.

The present application proposes improvements to the above-mentioned windings and to their treatment.

The present application relates to a winding of large textile yarn, preferably for dyeing, characterized in that the yarn is an interwoven textured synthetic continuous yarn having between 40 and 200 knots / meter, the winding being of the crossed type with straight sides, the cross being between 20 ° and 45 °, of density that is to say of mass per unit of volume, between 0.10 g / cm ³ and 0.30 g / cm3, of corresponding diameter to that of the dyeing machine, greater than 50 centimeters, and weighing more than 5 kilos.

Preferably the thread has between 80 and 150 knots / meter, and the crossover is between 30 and 38 °.

The present application also relates to a process for manufacturing the above winding, characterized in that at least one continuous synthetic thread coming from a supply means disposed above a texturing machine passes successively and from top to bottom, in a first oven maintained at a temperature between 150 ° C and 230 ° C, in a false-twist means, in an interlacing nozzle supplied with air at a pressure between 0.5 and 4 bars, in a second so-called retraction oven, maintained at a temperature between 150 ° C and 240 ° C, then returned by tangential cross winding in the form of large windings.

It is thus possible, in a single operation, to texturize, shrink, fix and wind up, in the form of large windings, sleeve type, intended for dyeing, threads without the drawbacks of numerous previous manipulations.

During the implementation of the dyeing treatment, at least one winding is treated directly in an autoclave comprising a single perforated central material holder in which it is threaded, the diameter of the winding corresponding to the inside diameter of the autoclave , at a temperature below 140 ° C., under a bath circulation pressure of less than 4 bars, the circulation of liquid fluid preferably taking place from the inside to the outside of the material; the winding then being, after treatment, used directly for further processing.

The present application thus makes it possible, in a single operation, on a winding coming from manufacturing, to practice a treatment by fluid without handling of wire, and to obtain a treated winding, as dyed for example, directly usable for subsequent transformations with a presentation of the wire on the winding remaining in the state, namely in the form of parallel layers of crossed wires, without landslide of the sides of the winding and mixing of the layers of wires; the wire, during its subsequent transformation, either to be wound in the form of a firm winding, or to be used directly on weaving or knitting looms, unwinding easily from the large winding without problem.

It is thus possible, in a single operation and on a single winding, to practice all these operations without the drawbacks noted later. The treatment method has all the advantages of free treatment without having the disadvantages; in particular there is an absence of preferential dye bath passages due to a very homogeneous mass, with windings threaded on the material holder and whose diameter corresponds to that of the processing machine and of a regular density of the wire winding, preferably between 0.10 and 0.20. This allows a great improvement in the productivity of the wire treatment process. Indeed, the fact of winding threaded on the material holder and whose diameter corresponds to that of the processing machine, allows to increase up to 50% the loading density of the autoclave compared to conventional treatments ; the bath ratio is generally reduced from 1 to 10 to approximately 1 to 6, the bath being shorter, its exhaustion is facilitated, which results in a reduction of the treatment cycle of the order of 20 to 25% of the time usual. If one wishes to transform the large windings into hard coils, there are no drawbacks, because of the non-deformation of the large windings, the unwinding of the wire is therefore reduced, which results in better textile cleanliness, quality of the winding and a possibility of support from 2.5 to 5 kilos without knots of thread.

The device used for the dyeing treatment is generally an autoclave, it comprises, in addition to the pumps usually used for the circulation of liquid bath, a single perforated material carrier receiving either a single winding, or a stack of windings with or without dividers , envelopes, sleeves; the passage of the treatment bath takes place in both directions, preferably the passage from the inside to the outside of the material is used.

Although the treatment practiced, is preferably that of dyeing the wire, it can also be a heat treatment of steam, water, or a liquid treatment containing adjuvants allowing specific properties to the wire. The spinning of the wire, after treatment, is carried out by air blowing, by suction or by centrifugation.

The texturing process, as claimed, makes it possible to obtain a textured yarn having an elasticity comparable to that which is obtained by the usual texturing-skewer or friction and dyeing processes, and this under better economic conditions.

The process used calls for a sequence of operations known elsewhere such as: simultaneous or sequential stretching-texturing, passage through the ovens, interlacing of the wire in a nozzle preferably located between two deliverers and before the second shrink oven , and tangential winding allowing the increase in the diameter of the winding up to values exceeding 50 centimeters and preferably exceeding 80 centimeters.

The yarns used for texturing can be continuous artificial and / or synthetic yarns used alone or in the form of assemblies, they can also be combined with fiber yarns. The process applies to simple or overstretched synthetic stretched yarn, on pre-oriented synthetic yarn or on weakly oriented yarn, preferably with simultaneous stretch-texturing in one case and sequential in the other. As synthetic yarns, yarns based on polyamide such as polyhexamethylene adipamide are preferably used.

The large winding or sleeve with straight flank obtained has a diameter greater than 50 centimeters, preferably 80 centimeters, its diameter is generally a function of the dyeing machine in which at least one of these windings is stacked. The winding can be carried out on a central tube possibly perforated, thus usable directly in dyeing.

For texturing, a false-twist machine is preferably used, making the wire feed from the top of the machine, the wire passing successively through the first oven, the false-twist means, an interlacing nozzle, a second shrink oven before being turned tangentially to give rise to large windings of dye. The temperature of the ovens depends on the material treated, in general the temperatures of the first oven are between 150 ° C and 230 ° C and those of the second oven between 150 ° C and 240 ⁼ C. Tangential winding is a conventional winding with drive by rollers preferably ordered.

The interlacing nozzle can be single-jet or with concurrent jets, it is supplied with air at a pressure of between 0.5 and 4 bars, the frequency of the interlacing nodes is preferably between 80 and 150 knots / metre. The false-twist means is either skewer or friction.

The large windings obtained have a sufficient density to be dyed and unrolled subsequently without difficulty, increasing the productivity of the process by avoiding reworking of the thread of the previous processes. The unwinding of the reel is carried out by known means, preferably by positive unwinding, either by internal control, or by control of the reel by its periphery, the unwinding can also be carried out on parade by adjusting the call voltage wire as a function of hardness desired for the coil to be produced, the coil being mounted on a means with an uncontrolled free axis preferably provided with ball bearings to avoid resistance due to the weight of the winding.

The following examples illustrate the present application without limiting it.

Example 1

• - texturation: vitesse 428 250 tours/minute, étirage: 1,29,
• - température du premier four 210°C, fausse-torsion par broche monogalet (brochette ARCT ET 24.610) torsion: 3 860 tours/mètre dans la zone d'étirage, débit: 111 m/min du fil étiré,
• - entrelacement buse à jets concourants alimentée par de l'air sous pression de 0,8 bar, retrait: 3 % (107,2 m/min), taux d'entrelacement: 125 noeuds/mètre,
• - température du deuxième four: 180°C, retrait dans le deuxième four: 47 %
• - renvidage du fil sous un taux d'étirage de 4 %, par bobinage croisé, croisure: 34°, par entraînement tangentiel à 59 m/min.

On an ARCT 480 texturing machine (ATELIERS ROANNAIS DE CONSTRUCTIONS TEXTILES), modified to allow the passage of the thread from top to bottom, a pre-oriented polyhexamethylene adipamide yarn of 98 dtex / 20 strands is stretched and textured under the following conditions :

• - texturing: speed 428 250 revolutions / minute, drawing: 1.29,
• - temperature of the first oven 210 ° C, false-twist by monogalet spindle (ARCT AND 24.610 skewer) twist: 3 860 turns / meter in the stretching zone, flow rate: 111 m / min of the drawn wire,
• - interlacing of nozzle with concurrent jets supplied by air under pressure of 0.8 bar, shrinkage: 3% (107.2 m / min), interlacing rate: 125 knots / meter,
• - temperature of the second oven: 180 ° C, shrinkage in the second oven: 47%
• - wire winding under a drawing rate of 4%, by crossed winding, crossover: 34 °, by tangential drive at 59 m / min.

The winding obtained on the right side has a width of centimeters, an outer diameter of 110 centimeters, an inner diameter of 40 centimeters, a density of 0.15 and a weight of 21 kilos.

This winding is easy to handle, without collapse.

Example 2

• - texturation: vitesse: 525 000 tours/min, torsion: 4 050 tours/mètre, température du premier four: 215°C, fausse-torsion par broche monogalet (brochette ARCT M 24.610),
• - entrelacement: buse à trois jets concourants, pression d'air: 1 bar,
• - température du deuxième four 200°C, fréquence: 110 noeuds/ mètre, retrait du deuxième four: 51 % renvidage du fil par bobinage croisé: croisure: 340, par entraînement tangentiel à 65 m/min.

On a texturing machine ARCT 480 modified to allow the feeding of the thread from top to bottom, a continuous drawn thread of polyhexamethylene adipamide is textured with two ends of 78 dtex / 17 strands under the following conditions:

• - texturing: speed: 525,000 rpm, twist: 4,050 rpm, temperature of the first oven: 215 ° C, false twist by monogalet spit (skewer ARCT M 24.610),
• - interlacing: nozzle with three concurrent jets, air pressure: 1 bar,
• - temperature of the second oven 200 ° C, frequency: 110 knots / meter, shrinkage of the second oven: 51% winding of the wire by cross winding: crossover: 340, by tangential drive at 65 m / min.

The straight flank winding obtained has a width of 17 centimeters, an external diameter of 108 centimeters and an internal diameter of 40 centimeters, as well as a density of 0.14 and a weight of 20 kilos.

This winding is easy to handle without collapsing the turns.

Example 3

Is carried out on stretching / texturing material identical to that of Example 1 a winding with straight flanks of drawn / textured continuous wire made of polyhexamethylene adipamide of title 98 dtex / 20 strands, width 17 centimeters, external diameter 110 centimeters, internal diameter 40 centimeters, density 0.18, weight 21 kilos, crossover of the thread 34 °, thread intertwined at 125 knots / meter.

• - autoclave de diamètre: 1,12 m,
• - hauteur d'empilement sur l'élément central: 100 centimètres, soit empilement de 8 enroulements superposés, enfilés sur l'élément central de 40 centimètres de diamètre, avec légère pression,
• - circulation de bain de l'intérieur vers l'extérieur:
  • température du bain: 80°C
  • composition du bain colorant Marine Dimacide SRL (LC.L): 2,4 %
  • adjuvants Univadine FP (CIBA GEIGY): 2 % PH 3,5 à 4 par acide acétique
  • rapport de bain: 1 à 6
  • pression d'alimentation à la pompe: 2 bars conditions d'essorage: essorage centrifuge.
  • On obtient ains, un enroulement teint prêt à transformation ultérieure.

This winding is dyed under the following conditions

• - diameter autoclave: 1.12 m,
• - stacking height on the central element: 100 centimeters, i.e. stacking of 8 superimposed windings, threaded on the central element 40 centimeters in diameter, with slight pressure,
• - bath circulation from inside to outside:
  • bath temperature: 80 ° C
  • composition of the Marine Dimacide SRL dye bath (LC.L): 2.4%
  • Univadine FP adjuvants (CIBA GEIGY): 2% PH 3.5 to 4 per acetic acid
  • bath ratio: 1 to 6
  • pump supply pressure: 2 bars spin conditions: centrifugal spin.
  • This gives a dyed winding ready for further processing.

Claims (5)

1. Large-size textile-yarn package, preferably for dyeing, characterized in that the yarn is at least one interlaced textured synthetic continuous yarn having between 40 and 200 interlacing per metre, the package being of the cross-wound straight-flank type of a crossing of between 20° and 45° and of a density of between 0.10 g/cm³ and 0.30 g/cm³, the diameter of the package being larger than 50 cm and its weight being greater than 5 kilograms.

2. Yarn package according to Claim 1, characterized in that the yarn has between 80 and 150 interlacings per metre, the crossing is between 30° and 38°, and the diameter is larger than 80 cm.

3. Yarn package according to Claim 1, characterized in that the textured synthetic continuous yarn is a continuous yarn based on polyamide, preferably based on polyhexamethylene adipamide.

4. Use of the yarn package according to Claim 1 in dyeing, characterized in that an autoclave having a single central perforated material holder, onto which it is slipped, is used, its outside diameter corresponding to the inside diameter of the autoclave, and its inside diameter corresponding to the outside diameter of the material holder onto which it is placed.

5. Process for producing the large-size textile-yarn package according to Claim 1, the yarn being at least one intertwined textured synthetic continuous yarn having between 40 and 200 interlacings per metre, the package being of the cross-wound straight-flank type of a crossing of between 20° and 45° and of a density of between 0.10 g/cm³ and 0.30 g/cm³, and the diameter of the package being larger than 50 cm and its weight greater than 5 kilograms, characterized in that at least one synthetic continuous yarn coming from a feed means located above a texturing machine passes successively from the top downwards into a first oven maintained at a temperature of between 150° and 230° C, into a false-twist means, into an intertwining nozzle fed with air at a pressure of between 0.5 and 4 bars, and into a second so-called shrinkage oven maintained at a temperature of between 150^c C and 240° C, and is then rolled up by tangential- drive cross winding to assume the form of a large-size package.