EP1723273A2

EP1723273A2 - False twist textured monofilament

Info

Publication number: EP1723273A2
Application number: EP05715771A
Authority: EP
Inventors: Achim Dulling; Eckhard Huesing; Sefik Halis
Original assignee: Trevira GmbH
Current assignee: Trevira GmbH
Priority date: 2004-03-09
Filing date: 2005-03-05
Publication date: 2006-11-22
Anticipated expiration: 2025-03-05
Also published as: DE102004011777A1; EP1723273B1; DK1723273T3; ATE513073T1; JP4954055B2; PT1723273E; WO2005087987A2; JP2007527958A; ES2367309T3; WO2005087987A3

Abstract

The invention relates to a method and device for producing textured, crimped monofilaments. To this end, at least two monofilaments are firstly subjected to a false twist texturing and are then separated and individually wound. The method works considerably faster than prior art methods for crimping monofilaments and results in monofilaments that lead to the production of products having well-undulated products.

Description

False-wire textured mono-parliament

The invention relates to a process for the production of textured monofilaments, the monofilaments produced by this process and a device for carrying out the process for the production of textured monofilaments.

According to DEM 60900, monofilaments or monofilaments are continuous filaments that consist of a single continuous filament. Monofilaments or monofilaments (both terms are used synonymously) in the sense of the invention are monofilaments with a diameter of at least 0.025-0.1 mm.

Due to their relatively large diameter, monofilaments are inherently relatively stiff and, when processed as such into textile products, result in a smooth product without a good textile handle, in particular the products made from monofilaments have practically no bulk.

Efforts have already been made to texturize monofilaments in order to give the monofilament a crimp and thus to obtain products with a corresponding bulk.

The best-known methods of texturing monofilaments include the edge pulling method, in which the monofilament is drawn at an acute angle over an edge or cutting edge, and the knit-de-knit method (crinkle method), in which a tube is knitted on a small circular knitting machine , which is then fixed, the monofilament is then pulled off at high speed.

Also common is the so-called separation twisting process, in which monofilaments are fed from supply bobbins via a delivery unit to a device in which the monofilaments are twisted together. Such a device can include two upper and two lower supply plants. The monofilaments are brought together at the so-called twisting point, then passed through a heating zone and a downstream cooling zone, after which they are separated at the twisting separation point by means of a yarn separation unit and then each fed to a separate winding or winding unit.

A certain number of turns per unit length are initially set between the thread point and the separating point. These twists then propagate continuously in the subsequent monofilament. The twine or twists always reproduce during the separating twist crimping process. Since rotation propagation has certain limits, the process works relatively slowly, so the productivity of this process is not particularly high.

A disadvantage of all of the above-mentioned methods is that the monofilaments textured in this way have only a relatively small crimp.

There is therefore still a need for a method which makes it possible to texture monofilaments at an increased speed, and for a method which provides monofilaments with a higher curl.

The object of the invention is therefore to provide a method with which monofilaments can be textured quickly and which leads to monofilaments which have a satisfactory crimp and thus lead to products with a good bulk.

This object is achieved by a method for texturing monofilaments, which is characterized in that at least two monofilaments are unrolled from a yarn carrier, or at least two monofilaments are taken off separately overhead, subjected to false-wire texturing and the monofilaments are then separated and wound up separately. Conventional false wire units such as

Disc aggregates, crossed straps (Murata), or magnetic spindles

are used, preferably a disc friction unit, in particular a three-axis disc friction unit. These devices are described by way of example in Fourne "Synthetic Fibers" Carl Hanser Verlag Munich Vienna 1995, for example on pages 432ff.

The false-wire texturing machine usually has at least one device for heating the monofilaments (heater), which is used to fix the texturing. The temperature used to fix the texturing depends on the type of polymer, these temperatures being generally known. For polyethylene terephthalate, this temperature can range, for example, from 170 ° C to 230 ° C.

Furthermore, false-wire texturing machines can be used which have two or more heaters. The temperature of the second heater can be above or below the temperature of the heater for fixing the texturing. A temperature of the second heater above the temperature of the heater to fix the texturing generally results in a harder grip on the textured monofilament. The temperature of the second heater can usually be 10 to 40 ° C., preferably 20 to 30 ° C., below the temperature of the heater for fixing the texturing.

The thread tensile forces with which the monofilaments are textured can be in a wide range, these being dependent on the diameter of the monofilaments. The thread tensile forces during the texturing are preferably in the range from 0.07 to 0.6 cN / dtex, particularly preferably in the range from 0.15 to 0.4 cN / dtex, these details relating to the diameter of the monofilaments before the texturing of the monofilaments.

A separating twist unit is particularly suitable for separating the false-wire textured monofilaments. Such an aggregate is also known per se and is described, for example, in Fourne “Synthetic Fibers” by Carl Hanser Verlag Munich Vienna 1995, for example on pages 436ff.

Conventional monofilaments made from the known fiber-forming polymers such as polyester, in particular polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethyl terephthalate (PTT), polyoxymethylene (POM), polyamides (PA), in particular polyamide 6 and polyamide 66, polyolefins, are suitable for carrying out the process according to the invention especially polyethylene (PE) and polypropylene (PP).

The monofilaments can already have a certain orientation due to the conditions prevailing during the extrusion of the polymers, preferably so-called POY yarns, i.e. H. Partially oriented yarns or "partially oriented yams" are used. Another manufacturing process is spin drawing, in which fully drawn monofilaments are produced and wound up (FOY, i.e. fully oriented yarns). These fully drawn monofilaments can also be textured using the process according to the invention.

If partially oriented yarns are textured, they can be drawn at the same time as the texturing. The draw ratio is preferably in the range from 1: 1 to 1: 2.5, this size being dependent, for example, on the polymer used to produce the monofilaments and / or the orientation of the monofilaments after spinning. In the case of PET, the stretching ratio can be, for example, in the range from 1: 1.7 to 1: 2.3. at A draw ratio of 1: 1.1 to 1: 1.7 is often used for PTT and PBT, without any intention that this should impose a restriction.

The monofilaments are generally unrolled or drawn off from a yarn carrier such as bobbins and fed to the texturing device, it being important that the monofilaments are not twisted with one another before the texturing process, so that unwanted rotations which would interfere with the separation process do not occur before the texturing process , to adjust.

Preferably, two monofilaments are fed to the texturing device, but other monofilaments can also be used, e.g. B. three or more.

The monofilaments can be passed through the false wire device at high speed. Typical texturing speeds of, for example, 300 m / min to 1200 m / min, preferably 300 m / min up to 800 m / min, preferably 500 to 800 m / min, in particular about 500 m / min are particularly suitable.

Thus speeds can be achieved which are equal to the speeds which are possible when texturing multifilament yarns using the false wire method.

After the false wire process, the monofilaments are separated and fed back to a yarn carrier, e.g. B. wound on coils and then fed to further processing. Accordingly, the monofilaments touch during the texturing according to the false wire process.

Suitable devices for issuing the false wire are conventional devices of the type known for false-wire texturing of multifilament yarns. A disc friction unit as shown on page 434 in is particularly suitable of the Fourne publication previously set forth. A version with three axes is preferred.

A double strap false-wire assembly is also advantageous, also shown on page 434 in the previously described publication by Fourne (Murata company, Osaka Japan).

A uniform apparatus which is composed of a device for false-wire texturing and an integrated or immediately subsequent yarn separation device is particularly suitable for carrying out the method according to the invention.

However, it is also possible to separate the two parts of the apparatus and the processes of texturing and separating spatially and temporally and to arrange them at a greater distance. In principle, it is even possible that the two devices are arranged separately, so that the false-wire texturing process can be carried out first, the monofilaments textured in this way can be stored as an intermediate product or can also be sent as such, and then, if appropriate, separated at an appropriate time interval. However, it is disadvantageous that the separation of the processes results in higher production costs. However, this does not detract from the quality of the product produced according to the invention.

The invention further relates to textured monofilaments, obtainable by a process according to one or more of claims 1 to 10, they are distinguished in particular by a higher bulk. The monofilaments obtainable according to the present process are characterized by excellent properties.

The textured monofilaments, in particular monofilaments made of polyester, for example PET, preferably have a tensile strength in the range from 20 to 50 cN / tex, particularly preferably in the range from 35 to 45 cN / tex. The elongation at break is preferably in the range from 15 to 40%, particularly in the range from 20 to 32%. The tensile strength and the elongation at break can be determined in accordance with DIN EN 2062.

The texturing of the monofilaments can be adjusted to a predetermined size by a person skilled in the art over a wide range. For example, so-called SET yarns can have a crimp of at least 4%, preferably at least 6% and particularly preferably at least 7%. The crimping of HE yarns (highly elastic yarns) can be at least 20%, preferably at least 30% and particularly preferably at least 40%. The crimp resistance of the textured monofilaments is preferably at least 50% and particularly preferably at least 65%. The crimp and crimp resistance can be determined in accordance with DIN 53840.

The monofilaments textured according to the invention have a surprisingly low gloss. The gloss of the textured monofilaments is preferably at most 20 (degree of gloss), particularly preferably at most 12.5 (degree of gloss). The gloss can be determined in accordance with DIN 67 530.

The monofilaments textured according to the invention are particularly suitable for the production of textile fabrics, for example fabrics, in particular curtain fabrics and for clothing fabrics.

The invention is illustrated by the following examples, without the invention being restricted to these examples.

Examples 1-4 describe spinning and drawing or spinning and Examples 5-7 relate to texturing and separating the monofilaments. example 1

Spinning and stretching or spinning stretching

PET chips with an intrinsic viscosity of 0.64 dl / g, a melt viscosity of 210 Pas, a melting point of 257 ° C were dried at a dryer temperature of 135 ° C in a drum dryer to a water content of 40 ppm.

The chips were melted in an extruder, the melting temperature being 290 ° C. The melt was fed to the spinning pump via a heated melt line of 295 ° C. The melt quantity fed to the nozzle pack was 24.8 g / min (for a titer 80 dtex f 2). The melt was extruded through a die plate 65 mm in diameter and 2 holes with a diameter of 1 mm and a length of 4 mm. The nozzle pressure was 135 bar.

The monofilaments are cooled in a blow shaft with a blow length of 2.5 m by cross-flow blowing. The blowing air had a humidity of 70% relative humidity and a speed of 0.45 m / sec. and a temperature of 20 ° C.

The solidified monofilaments are prepared at a nozzle / oiler distance of 3.5 m using a conventional texturing spin finish. The preparation pad was 0.30% based on the bifilar wound monofilament. The bifilar yarn is fed to the winding machine via an S-shaped pair of godets. The type LFW 35 from Barmag at 3100 m / min was used as the winding machine. operated. The winding tension was 0.05 - 0.1 cN / tex. Example 2

Monofilaments according to Example 1 are drawn on a stretch winder. The bifilar yarns are fed to a stretch winder from the Zinser company, type D 548. The stretching is carried out by 2 godets, between which a plate heater is arranged. The first godet has a temperature of 105 ° C, the plate heater has a temperature of 195 ° C and the second godet has room temperature. The total draw ratio for the spinning titer 80 dtex f 2 was 1.82 (final titer 44 dtex f 2). The winding speed was 1050 m / min.

Example 3

Monofilaments according to Example 1 in that instead of 2 nozzle holes, only 1 nozzle hole is used with a correspondingly reduced amount of melt.

Example 4

Production of the monofilaments up to and including the preparation of the threads in accordance with Example 1. Furthermore, the threads are drawn in the spinning process. A first heated (90 - 120 ° C) godet duo with 10 - 15 loops is wrapped around it. The speed of the duo is 1000 m / min. The threads then run into the draw frame and are heated on the 2nd duo (3000 m / min) at 130 - 180 ° C with 10 - 15 wraps. The drawn threads are then fed to the winder in accordance with Example 1. The draw ratio between godet duo 1 and 2 was 1: 3.

Example 5

Monofilament threads according to Example 1 are textured on a false wire texturing machine from Barmag, type FK6-V-900. The bifilar threads are unrolled from the POY spool and fed to the first delivery unit Wi. The texturing parameters for the production of SET and HE yarn are listed in Table 1, the textile-physical data of the false-wire textured monofilaments are summarized in Table 2. 6 mm PU washers of configuration 1-3-1 were used.

As soon as the threads turned back to 0 (false wire) leave the texturing unit, they are fed to a separating twisting unit from Retech * and separated there. The false-wire textured threads, which are then available separately, are simultaneously wound individually at the texturing speed according to Table 1 on the FK-6-V-900.

The separating twisting unit is available from Retech AG, CH - 5616 Meisterschwanden. The principle of this unit is described in EP 0 106 067 A2. This disclosure is expressly referred to here.

Table 1: Texturing parameters / stretch texturing

CS = Trevira CS® Table 2: Textile-physical properties of the threads textured according to Table 1

Example 6:

False-wire textured threads are textured according to Example 5, not immediately separated simultaneously, but bifilarly false-wire textured and wound on the texturing machine. The threads are then separated on a stretch winder, separated in time and space. The bifilar false-wire-textured yarn is unrolled, passed over a separating thread guide and fed to a take-off delivery unit, and finally each individual monofilament is wound up at 1000 m / min.

Example 7:

2 monofilaments are each drawn off overhead and then fed to the draw-in feeder Wi of the false-wire texturing machine in accordance with Example 5 and processed in the same way as in Example 5 into individual false-wire textured monofilaments.

Claims

claims

1. A process for the production of textured monofilaments, characterized in that at least two monofilaments are unrolled from a yarn carrier, or at least two monofilaments are taken off separately overhead, subjected to false-wire texturing and the monofilaments are then separated and wound up separately.

2. The method according to claim 1, characterized in that a disc friction unit is used as the false wire device.

3. The method according to claim 2, characterized in that one uses a three-axis disc friction unit.

4. The method according to at least one of claims 1 to 3, characterized in that the monofilaments are separated after the false wire texturing in a separating twist unit.

5. The method according to at least one of claims 1 to 4, characterized in that one carries out the false wire texturing and the separation spatially and / or temporally.

6. The method according to at least one of claims 1 to 5, characterized in that monofilaments made of polyester, in particular polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethyl terephthalate (PTT), polyoxymethylene (POM), polyamides (PA), in particular polyamide 6 and Polyamide 66, polyolefins, especially polyethylene (PE) and polypropylene (PP), are used.

7. The method according to at least one of claims 1 to 6, characterized in that so-called POY monofilaments are used.

8. The method according to at least one of claims 1 to 6, characterized in that one uses FOY monofilaments.

9. The method according to at least one of claims 1 to 8, characterized in that the texturing speed is in the range of 500 to 1200 m / min.

10. The method according to at least one of claims 1 to 9, characterized in that the thread tensile forces with which the monofilaments are textured are in the range from 0.07 to 0.6 cN / dtex.

11. Textured monofilaments obtainable by a process according to one of claims 1 to 10.

12. Monofilament according to claim 11, characterized in that the tear strength is in the range from 20 to 50 cN / tex.

13. Monofilament according to claim 11 or 12, characterized in that the elongation at break is in the range from 15 to 40%.

14. Monofilament according to at least one of claims 11 to 13, characterized in that the crimp is at least 4%.

15. Monofilament according to claim 14, characterized in that the crimp is at least 20%.

16. Monofilaments according to at least one of claims 11 to 15, characterized in that the crimp resistance is at least 65%.

17. Monofilaments according to at least one of claims 11 to 16, characterized in that the gloss is at most 20 (degree of gloss).

18. Textile fabric comprising monofilaments according to at least one of claims 11 to 17.

19. Device for the production of textured monofilaments comprising a false wire texturing device and a downstream separating apparatus.

20. The apparatus according to claim 10, characterized in that the separation apparatus is a separation device of a separation twisting system.