JP2007527958A - False twisted monofilament - Google Patents

Abstract

  A method and apparatus for producing a textured crimped monofilament is described, in which at least two monofils are first false twisted and then separated and wound up separately. According to this method, a monofilament can be obtained which can be operated much more rapidly than known methods for crimping monofilaments and which results in a product with sufficient bulkiness.

Description

  The present invention relates to a method for producing a textured monofilament, a monofilament produced by the method and an apparatus for carrying out the method for producing a textured monofilament.

  Monofilament or monofil refers to a continuous filament yarn consisting of one continuous fiber according to DIN (German Industrial Standard) 60900. In the present invention, monofil or monofilament (used in the same meaning in both expressions) means a monofil having a diameter of at least 0.025 to 0.1 mm.

  Monofil is inherently relatively stiff due to its relatively large diameter, and when monofil itself is processed into a fiber product, a smooth product with no good feel as a fiber is obtained, especially produced from monofil The product is practically not bulky.

Conventionally, in order to crimp a monofil and obtain a product having a corresponding bulkiness, the monofil is textured.
Known methods for texturing monofil include edge drawing method (Kantenziehverfahren) that pulls monofil at an acute angle or blade, and knitting a cylinder with a small circular knitting machine (Kleinrundrickmaskine), then fixing this cylinder Then, there is a knit-de-knit method (crinkle method) in which the monofil is pulled out from the knitting cylinder at a high speed.

  The so-called separation twisting method (Trenzwirnverfahren), in which the monofil is fed from a yarn reel (Voragespring) to a device for twisting the monofils through a feeder, is also common. Such a device may have two top and two bottom feeders. The monofils are brought together at a so-called twisting point and pass through a heating zone and a later connected cooling zone, after which the monofils are separated at the twisting separation point using a yarn separating device and then by a feeder Each is sent to a separate winding or winding reel.

  First, the number of rotations per length unit is adjusted to a fixed number between the twisting point and the twist separation point. This rotation is always transmitted to the continuously supplied monofilament yarn. Thus, twist or rotation is always transmitted during the separate twist crimping process. Since certain restrictions are set on the transmission of rotation, this method works relatively slowly, and as a result, the productivity of this method is not particularly high.

A disadvantage of all the above methods is that the monofilaments thus textured are relatively slightly crimped.
Accordingly, there is a need for a method that allows texturing of monofills at higher speeds, as well as a method that provides more crimped monofills.

  It is an object of the present invention to provide a method of making a monofil that can quickly texture the monofil and has a satisfactory crimp, thereby resulting in a product with sufficient bulk.

  The problem is that at least two monofils are fed out from the yarn holder, or at least two monofils are pulled out separately through the head, false twisted, and then these monofils are separated and wound up separately. This is solved by a method for texturing a monofill.

As false twisting device, for example
? Disc type device,
? Gekreuzte Riemchen (Murata),
Or normal false twisting devices such as magnet spindles, in particular disc friction devices, in particular triaxial disc friction devices can be used. These devices are described, for example, in “Synthetische Fasern” by Fourne (Carl Hanser Verlag, München, Wien 1995). 432 and later.

  False twisting machines usually have at least one device (heater) for heating the monofilament, which is used for fixing the textured process. The temperature used for fixing the textured process depends on the type of polymer and is generally known. For polyethylene terephthalate, this temperature can be in the range of 170 ° C. to 230 ° C., for example.

  Furthermore, false twisting machines having two or more heaters can also be used. The temperature of the second heater may be higher or lower than the temperature of the heater for fixing the textured process. When the temperature of the second heater exceeds the temperature of the heater for fixing the textured process, the textured monofilament usually has a harder feel. Usually, the temperature of the second heater may be 10 to 40 ° C., preferably 20 to 30 ° C. below the temperature of the heater for fixing the textured process.

  The yarn tensile force that textures the monofil may be in a wide range and depends on the monofil diameter. Preferably the yarn tensile force during texturing is in the range of 0.07 to 0.6 cN / dtex, particularly preferably in the range of 0.15 to 0.4 cN / dtex, these figures being monofilar textures. Related to the diameter of the monofil before processing.

A separation twisting device is particularly suitable for separating the false-twisted monofilament. An apparatus of this kind is also known per se, for example from the “Synthetische Fasern” by Fourne (Carl Hanser Verlag, München, Wien, 1995), eg p. 436 and later.
For carrying out the process according to the invention, for example, polyesters, in particular polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyoxymethylene (POM), polyamide (PA), in particular Conventional monofils of known fiber-forming polymers such as polyamide 6 and polyamide 66, polyolefins, in particular polyethylene (PE) and polypropylene (PP) are suitable.

The monofil already exhibits a certain orientation depending on the conditions during polymer extrusion, and so-called POY yarns, that is, partially oriented yarns or “partially oriented yarns” are preferably used. Another production method is spin-drawing (FOY or fully oriented yarns) in which a fully drawn monofil is produced and wound up. This fully stretched monofil can likewise be textured by the method according to the invention.
When the partially oriented yarn is textured, the partially oriented yarn can be drawn simultaneously with the textured processing. The draw ratio is preferably in the range from 1: 1 to 1: 2.5, this value depending for example on the polymer used for the production of the monofil and / or the orientation of the monofil after spinning. In the case of PET, the stretch ratio may be in the range of, for example, 1: 1.7 to 1: 2.3. In the case of PTT and PBT, draw ratios of 1: 1.1 to 1: 1.7 are often used, but are not limited thereto.

Normally, the monofil is unwound from a yarn holder, such as a reel, and fed to a texturing device, since it does not already cause undesirable twists that would interfere with the separation process before the texturing process. In addition, it is important that the monofilaments are not twisted together before the texturing process.
Preferably two monofils are supplied to the textured processing device, but more, eg three or more monofils can be used.

The monofilament can be passed through a false twist device at high speed. In that case, a normal texturing speed of, for example, 300 m / min to 1200 m / min, preferably 300 m / min to 800 m / min, especially 500 to 800 m / min, especially about 500 m / min, is particularly suitable.
Therefore, in the case of textured processing of multifilament yarns, the same speed that is possible with false twisting can be achieved.

  After the false twisting process, the monofilament is separated and sent again to the yarn holder and wound, for example on a reel or wound, and then further processed. The monofils are commensurately contacted during texturing by the false twisting process.

  As an apparatus for imparting false twisting, for example, an ordinary apparatus known for false twisting of multifilament yarn is suitable. Particularly suitable is the disc-type friction device shown, for example, on page 434 of the aforementioned Fourne document. A specification with three axes is preferred.

Similarly, the double belt false twisting device shown on page 434 of the aforementioned Fourne reference is also advantageous (Murata, Osaka, Japan).
Particularly suitable for carrying out the method according to the invention is a single device consisting of a yarn separating device which is integrated with the device for false twisting or mounted in direct connection.

  However, it is also possible to separate the two parts of the device and the texturing and separation steps spatially and temporally and widely separated. In addition, it is basically possible to arrange these two devices separately, so that the false twisting process can be carried out first, and the textured monofil is stored as an intermediate product. Or can be sent out as is, and in some cases, separated at appropriate time intervals. Certainly, as a disadvantage in that case, the manufacturing cost becomes higher by dividing the process. However, the quality of the product produced according to the present invention is not impaired thereby.

  Furthermore, the subject of the present invention is a textured monofil obtained by a method according to one or more of claims 1 to 10, in particular the monofil is characterized by a high bulkiness. The monofil obtained by this method is characterized by outstanding properties.

  Preferably textured monofils, in particular polyesters, such as PET monofils, exhibit a tear strength in the range of 20 to 50 cN / tex, particularly preferably in the range of 35 to 45 cN / tex. The elongation at break is preferably in the range 15 to 40%, in particular in the range 20 to 32%. The tear strength and elongation at break can be measured according to DIN EN2062.

  Monofilt texturing can be adjusted to values preset by those 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%, particularly preferably at least 7%. The crimp of the HE yarn (high elastic yarn) can be at least 20%, preferably at least 30%, particularly preferably at least 40%. The crimp stability of the textured monofil is preferably at least 50%, particularly preferably at least 65%. Crimp and crimp stability can be measured according to DIN 53840.

  The monofilt textured according to the present invention unexpectedly shows a slight gloss. Preferably the gloss of this textured monofil is at most 20 (glossiness), particularly preferably at most 12.5 (glossiness). The gloss can be measured according to DIN 67530.

  The processed monofils textured according to the invention are particularly suitable for the production of fiber sheet formations such as textiles, in particular curtain materials and clothing materials.

Next, the present invention will be described in detail with reference to the following examples. However, the present invention should not be limited to these examples.
Examples 1 to 4 describe spinning and drawing or spin drawing, and Examples 5 to 7 show monofilament texturing and separation.

Example 1
Spinning and drawing, or spinning drawing PET chips having an intrinsic viscosity of 0.64 dl / g, a melt viscosity of 210 Pas and a melting point of 257 ° C. were dried with a drum dryer at a drying temperature of 135 ° C. to a water content of 40 ppm.
The chips were melted with an extruder. The melting temperature was 290 ° C. The melt was fed to a spinning pump through a heated 295 ° C. melt conduit. The amount of the melt supplied to the nozzle packet was 24.8 g / min (for a fineness of 80 dtex f2). The melt was extruded through two holes having a diameter of 1 mm and a length of 4 mm with a nozzle plate having a diameter of 65 mm. The nozzle pressure was 135 bar.
The monofil was cooled by a crossflow air flow in a blower cylinder having a blower length of 2.5 m. At that time, the blown air had a relative humidity of 70%, a speed of 0.45 m / Sek, and a temperature of 20 ° C.
Cured monofilaments were prepared using conventional textured spinning preparations with a nozzle / lubricator spacing of 3.5 m. Here, the preparation coating was 0.30% with respect to the monofilament wound up by two pieces. This bifilament yarn was supplied to the winder in an S shape via a godet pair. As a winder, a Barmag LFW35 model was operated at 3100 m / min. At that time, the winding pressure was 0.05 to 0.1 cN / tex.

Example 2
The same monofil as in Example 1 was stretched with a stretch winder. The bifilament yarn was supplied to a D548 type draw winder manufactured by Zinser. In this case, stretching takes place through two godets with a plate heater attached between them. At this time, the first godet was at 105 ° C., the plate heater was at 195 ° C., and the second godet was at room temperature. Here, the total draw ratio for a spinning fineness of 80 dtex f2 was 1.82 (final fineness of 44 dtex f2). The winding speed was 1050 m / min.

Example 3
The same monofil as in Example 1, but instead of two nozzle holes, only one nozzle hole was used with a correspondingly reduced amount of melt.

Example 4
Production of a monofil to finally produce the same yarn as in Example 1.
Furthermore, this yarn is drawn in a spinning process. At that time, the heated (90 to 120 ° C.) first godet pair is wound with 10 to 15 windings. At that time, the speed of the pair was 1000 m / min. The yarn enters the drawing field and is heated in a second pair (3000 m / min) at 130 to 180 ° C. with 10 to 15 wraps. The drawn yarn is then fed to the same winder as in Example 1. The draw ratio between godet pair 1 and 2 was 1: 3.

Example 5
The same monofilament yarn as in Example 1 was textured with an FK6-V-900 type false twister from Barmag. The bifilament yarn was unwound from the POY reel and supplied to the _first feeder W1.
The textured parameters for producing SET- and HE yarns are shown in Table 1, and the fiber physical data of false twisted monofilaments are summarized in Table 2. A 6 mm PU disc of configuration 1-3-1 was used.
When restored returned to 0 turns (false twist) yarns leaves a textured device is supplied immediately Ritekku Inc. ^{* (Retech *)} of the separation twisting device, where it is separated. In that case, the false twisted yarns that are separated are simultaneously wound up individually on the FK-6-V-900 at the textured processing speed shown in Table 1.
A separate twister is available from Retech, Switzerland 5616 Meisterschwanden. The principle of this device is described in the European patent application publication EP0106067A2. This disclosure is cited as expressly set forth herein.

Example 6
The false twisted yarn is textured in the same manner as in Example 5. However, the false twisted yarn is not immediately separated and is false twisted and wound on a textured machine. The yarns are then separated in time and space and separated with a stretch winder. In that case, the false twisted yarn of the bifilament is unwound, guided by a yarn dividing guide (Trennfadenfuehler), supplied to a separating machine, and finally each individual monofilament is wound up at 1000 m / min.

Example 7
Two of monofil pulling through the head, respectively, then supplied to the pull-delivery apparatus W ₁ of the same texturing machine in Example 5, in the same manner as in Example 5 processed into individual false twisted monofilament did.

Claims (20)

  A method for producing a textured monofilament, characterized in that at least two monofils are unwound from a yarn holder, subjected to false twisting, and subsequently separated and wound up separately.   2. The method according to claim 1, wherein a disk-type friction device is used as the false twisting device.   3. A method according to claim 2, wherein a triaxial disc friction device is used.   The method according to at least one of claims 1 to 3, wherein the monofilament is separated with a separating twisting device after false twisting.   The method according to at least one of claims 1 to 4, characterized in that the texturing and separation are carried out spatially and / or temporally apart.   Polyester, especially polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyoxymethylene (POM), polyamide (PA), especially polyamide 6 and polyamide 66, polyolefin, especially polyethylene 6. The method according to claim 1, wherein monofilaments of (PE) and polypropylene (PP) are used.   7. A method according to at least one of claims 1 to 6, characterized in that a POY monofil is used.   7. A method according to at least one of claims 1 to 6, characterized in that FOY monofil is used.   9. A method according to at least one of claims 1 to 8, characterized in that the textured speed is in the range of 500 to 1200 m / min.   10. A method according to at least one of claims 1 to 9, characterized in that the yarn tensile force when texturing the monofil is in the range of 0.07 to 0.6 cN / dtex.   A textured monofil obtained by the method according to any one of claims 1-10.   12. Monofil according to claim 11, characterized in that the tear strength is in the range of 20 to 50 cN / tex.   The monofil according to claim 11 or 12, wherein the elongation at break is in the range of 15 to 40%.   14. Monofil according to at least one of claims 11 to 13, characterized in that the crimp is at least 4%.   15. A monofil according to claim 14, wherein the crimp is at least 20%.   16. Monofil according to at least one of claims 11 to 15, characterized in that its crimp stability is at least 65%.   The monofil according to claim 11, wherein the gloss is a maximum of 20 (glossiness).   The fiber sheet formation containing the monofil of at least one of Claims 11-17.   An apparatus for producing a textured monofil comprising a false twisting device and a downstream separation device.   The apparatus according to claim 10, wherein the separation device is a separation device of a separation twisting device.