EP0301266B1 - Method for continuously sizing and stretching synthetic filaments - Google Patents

Abstract

The method for the production of partial warps wound on warping beams or sectional beams, or warps of synthetic filament yarns wound on warp beams, which are completely stretched and sized, consists of sizing a group of parallel synthetic thermoplastic filament yarns, the filaments of which are not completely stretched, in a sizing zone, predrying the sized yarns in a heated predrying zone, subjecting the predried sized group of yarn by final drying in a heated final drying zone, and finally winding the dried group of yarns on warping or (sectional) beams, while the filaments of the filament yarns are stretched jointly and simultaneously in the predrying zone. The stretching occurs preferably between rolls (5, 6) assigned to the sizing zone and rolls (10) assigned to the final drying zone. The method may be carried out with conventional, at most slightly modified sizing machines and it furnishes very uniform partial warps or warps. In particular the filaments of the filament yarns are stretched very uniformly. In addition, a twisting or twist-replacement treatment of the filament yarns prior to sizing may be eliminated because warps are obtained, the filament yarns of which have sufficient cohesion for further processing and a high density of their filaments.

Description

The invention relates to a process for the production of partial chains wound on warp beams or partial warp beams or chains of synthetic filament yarns wound on warp beams, which are essentially completely stretched and sized, according to which a family of essentially parallel synthetic filament yarns is used as the starting material and this family of a possibly heated sizing zone is guided and finished there, then passed through a heated predrying zone and predried there, then passed through a heated final drying zone and subjected to final drying there and finally onto slip beams or partial warp beams or Warp beams is wound up, the filaments of the filament yarns of the sheet of the display material not being fully drawn and these filaments in or essentially in the predrying zone together and simultaneously using a roller system assigned to the size zone and a roller system assigned to the final drying zone, these roller systems having different peripheral speeds rotate, be stretched.

The term "filament yarn" means a yarn made of multiple filaments; the term "filament" includes an endless (continuous) thread-like structure, that is to say a practically unlimited length (cf. DIN 60 000).

Partial warps wound on slip trees are those which are used for assembly - to form a warp wound on a warp beam.

• werden die Garne durch ein Zufuhrspulengestell geliefert, mittels einer Führung parallel angeordnet und durch einen Behälter geleitet, der eine Schlichteflüssigkeit enthält, in der zumindest ein Fadenkohäsionsmittel vorhanden ist;
• werden also Ausgangsmaterial kontinuierliche thermoplastische Garne eingesetzt, in welchen die Fäden (Filamente) im wesentlichen parallel und nicht völlig verstreckt sind;
• werden das Strecken und das Schlichten gleichzeitig oder im wesentlichen gleichzeitig durchgeführt, während die Garne im Behälter, der die Schlichteflüssigkeit enthält, eingetaucht sind.

A method for producing warp beams or partial warp beams from continuous synthetic yarns, which are essentially completely stretched and sized and are suitable for use on looms for the manufacture of fabrics, is known from European Patent No. 0.091 549. According to this known method

• the yarns are supplied through a feed bobbin, arranged in parallel by means of a guide and passed through a container which contains a sizing liquid in which at least one thread cohesive agent is present;
• So starting material continuous thermoplastic yarns are used, in which the threads (filaments) are essentially parallel and not completely drawn;
• stretching and sizing are carried out simultaneously or substantially simultaneously while the yarns are immersed in the container containing the sizing liquid.

• gemeinsam und gleichzeitig verstreckt werden, während sie in einem Behälter, der eine thermostatische Flüssigkeit, wie Wasser, enthält, eingetaucht sind,
• danach einer Verflechtungsbehandlung mit Hilfe einer Luftdüse unterzogen werden und
• schließlich geschlichtet werden.

Also known from European Patent Application No. 0 144 617 is a process for producing chains or partial chains wound on warp beams from continuous, synthetic, fully drawn yarns, which are suitable for all types of textiles produced on looms.
For this process, known from European Patent Application No. 0 144 617, at least 24 continuous, thermoplastic yarns made of essentially parallel and partially drawn filaments are used

• stretched together and simultaneously while immersed in a container containing a thermostatic liquid, such as water,
• then undergo interlacing treatment using an air nozzle and
• finally be arbitrated.

• Die zur Zeit üblichen Vorrichtungen zum Schlichten von Teilketten oder Ketten, bestehend aus einem Schlichtetrog, Vortrocknern und einem Endtrockner, sind ohne kostspielige Zusatzeinrichtungen bzw. umfangreiche konstruktive Änderungen weder zur Durchführung des Verfahrens nach dem europäischen Patent Nr 0 091 549 noch zur Durchführung des Verfahrens nach der europäischen Patentanmeldung Nr. 0 144 617 geeignet. So muß zur Anwendung des Verfahrens nach dem europäischen Patent Nr. 0 091 549 in eine solche übliche Schlichtvorrichtung, und zwar in dessen Schlichtetrog, eine komplette Streckeinrichtung, bestehend aus Antrieb, Getriebe und Streckwalzen, eingebaut werden. Zur Anwendung des Verfahrens nach der europäischen Patentanmeldung Nr. 0 144 617 bedarf es bei einer solchen üblichen Schlichtvorrichtung des Anbaus eines Behälters - für die thermostatische Flüssigkeit - mit kompletter Streckeinrichtung, bestehend aus Antrieb, Getriebe und Streckwalzen, sowie ferner einer Einrichtung mit Luftdüsen zur Verflechtung (Verwirbelung) der Filamente eines jeden Garnes miteinander.
• Sowohl beim Verfahren nach dem europäischen Patent Nr. 0 091 549 als auch beim Verfahren nach der europäischen Patentanmeldung Nr. 0 144 617 sind die Streckzonen vergleichsweise kurz. Dadurch ist es nur begrenzt möglich, eventuell vorhandene Ungleichmäßigkeiten, wie Spannungsschwankungen oder Filamentschlingen, der als Ausgangsmaterial zugeführten Filamentgarne auszugleichen oder zum Verschwinden zu bringen.
  Durch die kurzen Streckzonen bei den zuvor erwähnten bekannten Verfahren ist es außerdem nur in beschränktem Maße möglich, eine sehr gleichmäßige Verstreckung der Filamente und damit der Filamentgarne zu erreichen.
• Bei den bekannten Verfahren müssen die Garne vor dem Schlichten jeweils einer Zwirn- oder Zwirnersatz-Behandlung unterzogen werden, da sonst der Zusammenhalt der Filamente, also der Filamentverbund, und die Filamentdichte innerhalb eines jeden Garns zu gering bzw. nicht ausreichend ist, was - durch lose oder abstehende Filamente - beispielsweise beim Weben zu Schwierigkeiten führen oder später das optische Bild des fertigen Gewebes beeinträchtigen kann.
  Als Zwirnersatz-Behandlung wird hauptsächlich das - stellenweise - Verflechten (Verwirren) der Filamente mit Hilfe einer Fluid-Düse, vorzugsweise einer Luftdüse, angewandt.
  Dieses Verflechten mit einer Luftdüse hat folgende Nachteile.
  • Es führt zu einem sehr hohen Geräuschpegel,
  und

• es ist kostspielig durch den hohen Energiebedarf (letzteres gilt im übrigen auch für das Zwirnen selbst).

However, these known methods have the following disadvantages:

• The currently customary devices for sizing partial chains or chains, consisting of a sizing trough, predryers and a final dryer, are neither expensive to carry out the process according to European Patent No. 0 091 549 nor to carry out the process without expensive additional devices or extensive design changes European patent application No. 0 144 617. For example, in order to use the method according to European Patent No. 0 091 549, a complete stretching device consisting of drive, gear and stretching rollers must be installed in such a conventional sizing device, namely in its sizing trough. To use the method according to European patent application No. 0 144 617, such a conventional sizing device requires the installation of a container - for the thermostatic liquid - with a complete stretching device consisting of drive, gear and stretching rollers, and also a device with air nozzles for interlacing (Interlacing) the filaments of each yarn with each other.
• The stretching zones are comparatively short both in the process according to European patent No. 0 091 549 and in the process according to European patent application No. 0 144 617. As a result, it is only possible to a limited extent to compensate for any irregularities that may be present, such as tension fluctuations or filament loops, of the filament yarns supplied as the starting material or to make them disappear.
  Due to the short drawing zones in the known processes mentioned above, it is also only possible to a very limited extent to achieve a very uniform drawing of the filaments and thus the filament yarns.
• In the known methods, the yarns have to be subjected to a twist or twist replacement treatment before sizing, since otherwise the cohesion of the filaments, that is to say the filament composite, and the filament density within each yarn is too low or insufficient, which is due to loose or protruding filaments - for example, can cause difficulties when weaving or can later impair the optical image of the finished fabric.
  The twist replacement treatment mainly involves - in places - interlacing (tangling) the filaments with the aid of a fluid nozzle, preferably an air nozzle.
  This interlacing with an air nozzle has the following disadvantages.
  • It leads to a very high noise level,
  and

• it is expensive due to the high energy requirement (the latter also applies to the twisting itself).

Finally, from BE-905 768 a method of the type mentioned is known.
However, BE-905 768 does not provide any information on how uniform partial chains or chains can be produced in all respects with the method described therein. In particular, BE-905768 says nothing about how, with the method known from it, the removal of irregularities, such as filament loops, of the filament yarns fed as the starting material, a very uniform stretching of the filaments of the filament yarns, an even distribution of the size on the filament yarns and whose filaments - so that both are practically completely covered by the size - a high uniformity of the filaments in terms of their density - so that completely closed filament yarns are obtained - and a high uniformity of the filament yarns with regard to the parallelism of their filaments can be achieved.

The invention has for its object to provide a method of the aforementioned type for the production of partial chains or partial warp chains wound chains or chains of synthetic filament yarns wound on warp beams, with the inexpensive and / or without great effort qualitatively flawless, especially in any Regarding even partial chains or chains can be made; it should be possible to dispense with a thread or thread replacement treatment for the filament yarns before sizing.

Starting from a method of the type mentioned at the outset, this object is achieved by the features specified in the characterizing part of the single claim.

According to the invention, the filaments of the filament yarns of the batch of the starting material are drawn together and simultaneously in the predrying zone or essentially in the predrying zone. "Essentially in the pre-drying zone" means: in the area between the last rollers assigned to the size zone and the rollers assigned to the final drying zone.

According to the invention, a family of essentially parallel synthetic thermoplastic filament yarns, etc. passed through an optionally heated size zone and finished there. "An optionally heated size zone" means that the size zone, in particular the size liquid in the size trough, can be heated or unheated; "unheated" means that the sizing liquid e.g. Has room temperature.

• Das erfindungsgemäße Verfahren kann mit Hilfe von heute üblichen Schlichtmaschinen ohne die Notwendigkeit von teueren Zusatzeinrichtungen und/oder konstruktiven Änderungen (eine bauliche Vergrößerung ist ebenfalls nicht notwendig), sondern allenfalls mit einer einfachen Veränderung des Übersetzungsverhältnisses des Antriebs der Walzen im Schlichtetrog durchgeführt werden;
• da die Verstreckung in der Vortrockenzone stattfindet und diese auch bei den heute üblichen Schlichtmaschinen - zur ausreichenden Vortrocknung - relativ lang sein muß, werden Ungleichmäßigkeiten der zugeführten Filamentgarne leicht beseitigt. Ferner wird die Wärme in der Vortrockenzone als Streckhilfe mitgenutzt.
  Durch die entsprechend lange Vortrockenzone und damit das lange Verweilen der Filamentgarne in der temperierten Umgebung dieser Zone werden außerdem die Filamente der Filamentgarne sehr gleichmäßig verstreckt;
• gegenüber den heute üblichen Schlichtverfahren benötigt man in der Vortrockenzone weniger Wärme, da die - durch das der Schlichtezone zugeordnete Walzensystem eingeleitete - Streckenenergie in Wärme umgewandelt wird und zur Vortrocknung des Schlichtefilms mitgenutzt wird;
• es ist nicht notwendig, die Filamentgarne vor dem Schlichten einer Zwirn- oder Zwirnersatz-Behandlung zu unterziehen, denn nach der Erfindung erhält man Teilketten oder Ketten, deren Filamentgarne jeweils einen ausreichenden Zusammenhalt für ihre Weiterverarbeitung und eine hohe Dichte ihrer Filament aufweisen; dabei sind diese Filamentgarne völlig geschlossen und weisen - im Gegensatz zu den Filamentgarnen der Ketten oder Teilketten, die nach den bekannten Verfahren hergestellt werden, und die einen eher abgeflachten Garnquerschnitt besitzen - einen praktisch runden Garnquerschnitt auf. Außerdem verlaufen die Filamente der Filamentgarne nach der Erfindung weitestgehend parallel, und deren Schlichteumhüllung und -durchtränkung ist praktisch vollständig. d.h., daß sowohl die Filamentgarne selbst als auch deren Filamente von der Schlichte praktisch völlig umhüllt sind.

The invention has the following advantages:

• The method according to the invention can be carried out with the help of sizing machines customary today without the need for expensive additional devices and / or structural changes (a constructional enlargement is also not necessary), but at best with a simple change in the transmission ratio of the drive of the rollers in the sizing trough;
• since the drawing takes place in the predrying zone and this must also be relatively long, in the case of the sizing machines customary today, in order to adequately predry, irregularities in the filament yarns supplied are easily eliminated. The heat in the pre-drying zone is also used as a stretching aid.
  Due to the correspondingly long pre-drying zone and thus the long dwelling of the filament yarns in the temperate environment of this zone, the filaments of the filament yarns are also stretched very uniformly;
• Compared to the usual sizing processes, less heat is required in the predrying zone, since the section energy introduced by the roller system assigned to the sizing zone is converted into heat and is used to predry the sizing film;
• it is not necessary to subject the filament yarns to a thread or thread replacement treatment before sizing, because according to the invention partial chains or chains are obtained whose filament yarns each have sufficient cohesion for their further processing and a high density of their filaments; these filament yarns are completely closed and - in contrast to the filament yarns of the chains or partial chains, which are produced by the known processes and which have a rather flattened yarn cross section - have a practically round yarn cross section. In addition, the filaments of the filament yarns according to the invention run largely parallel, and their size wrapping and impregnation is practically complete. that is, both the filament yarns themselves and their filaments are practically completely covered by the size.

According to the invention, a family of essentially parallel synthetic thermoplastic filament yarns is used as the starting material. The filaments in these filament yarns can also be parallel; however, although it is not necessary, the filaments may be interlaced (tangled) in places, for example with the aid of an air nozzle, or they may have been subjected to a twist.

The filament yarns used for the purposes of the invention can, for example, consist of polyester, such as polyethylene terephthalate, polyamide, such as polyamide-6 or polyamide-66, polyolefin, such as polyethylene or polypropylene, and also consist of their mixtures or copolymers. However, the filament yarns can also consist of other synthetic thermoplastic polymers or their modifications.

The invention is explained below with reference to the drawing.
FIG. 1 shows schematically and in section a conventional device for sizing partial chains or chains made of synthetic filament yarns that is suitable for carrying out the method according to the invention.

A predetermined number of bobbins with synthetic thermoplastic filament yarn, the filaments of which are not fully drawn, are placed on a conventional bobbin, not shown; the yarns are drawn off from this creel under constant thread tension and arranged in parallel with the aid of a reed, also not shown, after which the sheet of filament yarns thus formed is guided via a roller system 1 rotating at constant speed and a roller 2 to a size trough 3 forming the size zone, which is filled with a sizing liquid. The yarns are then passed through a sizing roller 4 through the sizing liquid and from there via a sizing roller 5 to the nip between the sizing roller 5 and a squeeze roller 6, where the sizing liquid is applied and the excess thereof is squeezed off at the same time. From the rollers 5 and 6, the yarns then form through the predrying zone heated pre-dryer 7 and 8 passed where they are pre-dried; from there the yarns are passed through a final dryer 9 forming the final drying zone, where they are subjected to final drying by being guided over heated drying cylinders 10. Finally, the - parallel - filament yarns are guided from the end dryer 9 to a slip beam, partial warp beam or warp beam 11, on which they are wound up.

The rollers 5 and 6 rotate at a peripheral speed which is lower than that of the drying cylinder 10, whereby the filaments of the filament yarns are stretched together and simultaneously, to be precise between the pair of rollers 5, 6 and the drying cylinders 10, i.e. in the predrying zone or in essential in the pre-drying zone.

The method according to the invention can also be carried out in such a way that the filament yarns are not drawn off directly from bobbins placed on a creel, but for example from one tree or several trees.

The chains produced by the process according to the invention show excellent running behavior during weaving, and the fabrics produced from these chains have excellent properties with regard to color affinity, color uniformity, strength and elongation properties, tendency to bulge and length increase.

The invention is further illustrated by the following examples.

example 1

1,492 bobbins with polyamide 66 filament yarn 97.7 dtex f 17 (partially oriented yarn = POY), the filaments of which were thus pre-oriented, were placed on a conventional bobbin creel (from Benninger, Switzerland); the filament cross section was round.
The tensile strength of the filament yarn was 35.2 cN / tex and the elongation at break was 75%.

For this example, a slip sizing machine from Tsudakoma, Japan, was used, in which the gear ratio of the drive of the sizing roller assigned to the sizing trough had been changed by simply replacing a pair of gearwheels so that the drying cylinder of the final dryer was at least 33 % higher peripheral speed than the size roller and the squeeze roller.

The yarns were drawn off from the creel at a speed of 312.2 m / min using a draw-off roller system under constant thread tension.

Between the creel and the take-off roller system were 2 eyelet reeds and 1 comb in the direction of the thread, with the help of which the yarns were arranged in parallel.

The filament yarn group thus formed was passed to a size trough which was filled with a size liquid.

The size liquid consisted of an 11% aqueous solution (liquor concentration) of an acrylic size (Sopronyl AR 41 from Rhône-Poulenc, France) and had a temperature of 42 ° C.

The yarns were then passed over a roller immersed in the sizing liquid (immersion roller) and from there passed over the sizing roller also immersed in the sizing liquid to the pinch joint between this sizing roller and a squeezing roller.
The squeezing pressure between the sizing roller and the squeezing roller - when running - was 6.0 kg / cm² (6.0 daN / cm²).
The size roller and the squeeze roller rotated at a peripheral speed of 312.9 m / min.

The - parallel - yarns were then passed through two pre-dryers connected in series, both of which had a temperature of 150 ° C. The predrying zone formed by the two predryers was 11 m long.

The family of parallel filament yarns was then passed through a final dryer, the first drying cylinder of which rotated at a peripheral speed which was 31.67% higher than the peripheral speed of the sizing roller and the squeeze roller.

The yarns were subjected to final drying by being guided over the five heated drying cylinders of the final dryer.
The first four drying cylinders of the final dryer each had a temperature of 135 ° C; the last drying cylinder of the final dryer had a temperature of 110 ° C.

The filaments of the filament yarns were stretched in the area between the sizing / squeezing roller and the drying cylinders of the final dryer.

Finally, the - parallel - filament yarns were led from the final dryer to a slip of paper on which they were wound up.

The thread tensile forces determined during the implementation of the method according to the invention - measured on the individual filament yarn - were the following:

The filament yarns thus sized and drawn had the following properties:
Titer: 83.1 dtex (arbitrated)
Tear resistance: 41.5 cN / tex
Elongation at break: 40%
Cooking shrinkage (30 min in boiling water): 7.04%
Sizing pad: 4.66%

The filament yarns obtained had an almost round yarn cross section and their filament composite was closed. The core and coat arbitration was practically complete.

Several partial chains obtained in this way, wound up on slip trees, were combined by assembly to form a woven chain wound on a warp beam, which showed excellent running behavior during weaving.
The fabric produced from this warp showed very good properties in terms of color affinity, color uniformity, strength and elongation properties, tendency to bulge and length increase; in particular, a very soft feel of the finished fabric could be achieved with this warp.

Example 2

397 spools with 120dtex f 22 (medium oriented yarn = MOY) polyethylene terephthalate filament yarn, the filaments of which were thus pre-oriented, were placed on a conventional spool creel (from Karl Mayer, Obertshausen, Federal Republic of Germany); the filament cross section was round. The tensile strength of the filament yarn was 43.7 cN / tex and the elongation at break was 238.3%.

For this example, a slip finishing machine from Sucker, Federal Republic of Germany, was used, in which the gear ratio of the drive of the finishing roller - assigned to the finishing trough - had been changed by the simple installation of a change gear in the cardan shaft driving the finishing roller the drying cylinders of the final dryer could rotate at least 235% more peripheral speed than the sizing roller and the squeeze roller.

The yarns were drawn off from the creel at a speed of 45.2 m / min with the aid of a draw-off roller system under constant thread tension.

Between the creel and the take-off roller system were 1 eyelet reeds and 1 comb in the direction of the thread, with the help of which the yarns were arranged in parallel.
The filament yarn sheet thus formed was passed to a size trough which was filled with a size liquid.

The size liquid consisted of a 20 to 21% aqueous solution (liquor concentration) of a polyester size (Gerol PS 25 from Rhône-Poulenc, France) and had a temperature of 74 to 77 ° C.

The yarns were then passed over a roller immersed in the sizing liquid (immersion roller) and from there via the sizing roller lightly touching the surface of the sizing liquid to the nip between this sizing roller and a squeezing roller.
The squeezing pressure between the sizing roller and the squeezing roller - during the run - was 600 daN (based on the total contact line or area of the two rollers).
The size roller and the squeeze roller rotated at a peripheral speed of 45.0 m / min.

The - parallel - yarns were then passed through two pre-dryers connected in series, both of which had a temperature of 120 ° C. The predrying zone formed by the two predryers was 10 m long.

The family of parallel filament yarns was then passed through a final dryer, the first drying cylinder of which rotated at a peripheral speed which was 221.3% higher than the peripheral speed of the sizing roller and the squeeze roller.
The yarns were subjected to final drying by being guided over the five heated drying cylinders of the final dryer.

The first four drying cylinders of the final dryer each had a temperature of 145 ° C; the last drying cylinder of the final dryer had a temperature of 105 ° C.

The filaments of the filament yarns were stretched in the area between the sizing / squeezing roller and the drying cylinders of the final dryer.

Finally, the - parallel - filament yarns were led from the final dryer to a slip of paper on which they were wound up.

The thread tensile forces determined during the implementation of the method according to the invention - measured on the individual filament yarn - were the following:

The filament yarns thus sized and drawn had the following properties:
Titer: 54.6 dtex (arbitrated)
Tear resistance: 39.4 cN / tex
Elongation at break: 29.1%
Cooking shrinkage (30 min in boiling water): 3.7%
Sizing pad: 5.5%

The filament yarns obtained had an almost round yarn cross section and their filament composite was closed. The core and coat arbitration was practically complete.

Several partial chains obtained in this way, wound on slip trees, were combined by assembly to form a woven chain wound on a warp beam, which showed excellent running behavior during weaving.
The fabric made from this warp showed very good properties in terms of color affinity, color uniformity, strength and elongation properties, tendency to bulge and length increase.

The following applies to example 1:

The starting yarn (polyamide 66 filament yarn 97.7 dtex f 17) was - before it was used for the process according to the invention - only a very light thread replacement treatment - with the help of a Air nozzle for interlacing (tangling) the filaments with one another - and had only 1 or 2 interlacing points (confusing points or fixed points - see, for example, the German design specification 16 60 267) per m.

The following applies to example 2:

The starting yarn (polyethylene terephthalate filament yarn 120 dtex f 22) had not been subjected to any thread or thread replacement treatment.

Claims (1)

1. Method for the production of sectional warps wound up on back beams or sectional warp beams or of warps wound up on warp beams, made of synthetic filament yarns that are substantially completely drawn and sized, in accordance wherewith a ribbon of substantially parallel synthetic filament yarns is used as the base material, and this ribbon is passed through a sizing zone which, if required, is heated, and is sized therein, subsequently passed through a heated preliminary drying zone and is there predried and thereafter passed through a heated final drying zone and there subjected to final drying and finally wound up on back beams or sectional warp beams or warp beams, the filaments of the filament yarns of the ribbon of the base material not being completely drawn and these filaments being jointly and simultaneously drawn in, or substantially in, the predrying zone by means of a roller system assigned to the sizing zone and a roller system assigned to the final drying zones, these roller systems rotating at different peripheral speeds, characterized in that the preliminary drying zone is at least 10 m long, and in that the roller system assigned to the final drying zone rotates at a peripheral speed that is at least 31.67% higher than the roller system assigned to the sizing zone.

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