JPS6278212A - Production of polyester combined filament yarn having multicolor effect - Google Patents

Abstract

PURPOSE:To obtain polyester combine filament yarn having multicolor effect having improved evenness of combine filament yarn free from defects such as loop, etc., by combining two kinds of filament groups having different dyeing properties which are simultaneously obtained from the same spinneret by melt spinning under a specific condition. CONSTITUTION:Two kinds of filament groups having mutually different dyeing properties which are simultaneously obtained from the same spinneret 1 by melt spinning are cooled to <=80 deg.C once, solidified and fed to a heated fluid zone 6. Spun yarn heated and drawn under influence of heat and tension is wound at 4,000-6,000m/min high speed. Polyester combined filament yarn having multicolor effect useful for cloth free from fluff is efficiently obtained.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for producing a heterochromatic mixed fiber yarn, and in particular, to a method for producing a heterochromatic mixed fiber yarn, in particular, it can be produced using a direct spinning/drawing method to produce a quality yarn with good heather unevenness and no defects such as loops. The present invention relates to a method for producing a polyester mixed yarn with different dyeing properties suitable for use in clothing.

[Conventional technology]

Conventionally, the method for manufacturing polyester discolored blended yarn involves spinning and drawing two types of polymers with different dyeability, and then aligning and interlacing them in appropriate steps from spinning to fabrication and knitting. Methods that separate processes have been adopted.

In recent years, for the purpose of improving productivity, a so-called direct spinning and drawing method, in which the spinning process and the drawing process are made continuous, has been developed and is beginning to be put into practical use industrially. In this direct spinning/drawing method, the spun yarn is melted and discharged from a melt spinneret, cooled, and then passed around a drawing roller heated to a temperature above the glass transition point and a take-off heat set roller heated above the crystallization initiation temperature. In this method, the film is stretched at a magnification determined by the difference in circumferential speed between the stretching roller and the take-off heat setting roller, and heat treatment is performed using the take-off heat set roller to impart thermal dimensional stability. However, although the physical properties of the fiber obtained by this method are favorable, when the heat setting roller is used at a high speed of 4,000 to 6,000 m/min, the yarn sways greatly, especially when the roller has 4 or more yarns. When a multi-filament yarn is rotated many times, overlapping threads may occur between the yarns, resulting in yarn breakage, or if you try to increase the yarn spacing to avoid this, the roller length will become longer and the device will However, there were problems such as high-speed rotation being impossible.

In addition, this method consists of two types of polyester polymers with different dyeability, and therefore two types of filament groups with essentially different drawability are drawn at the same drawing temperature and the same draw ratio. When the stretching temperature and stretching ratio are set to favorable conditions for one filament group, the other filament group is formed thick and thin along the fiber longitudinal direction.
This results in dyeing spots, yarn breakage, and single fiber breakage.As a result, there is no suitable condition that satisfies both filament groups. It was not possible to directly spin and draw the filaments. It can be said that the reason why the appropriate stretching ratios of the two filament groups are different from each other is due to the difference in fiber structure derived from the substrates of the two types of polyester polymers.

Here, the appropriate stretching ratio refers to a stretching ratio in which there are no unevenness in the longitudinal direction of the fibers and the elongation at break falls within a practically preferable range of 30 to 45 inches. As shown in FIG. 1, since the stress-stretch curves of the yarns just before being guided to the drawing rollers of the two types of filament groups are different, for example, in the filament group (curve A) where the appropriate drawing ratio is low, the X area is This is because in the case of a high filament group (curve B), there is a Y region, and regions X and Y of appropriate stretching ratios do not overlap each other. Furthermore, in this method, the heat treatment after drawing is carried out by making the yarn go around the take-up heat setting roller, so relaxation occurs between the take-up heat setting roller and the winder, and as a result, relaxation heat treatment is performed. However, between the filament group with a high draw ratio and the filament group with a low appropriate draw ratio, the filament group on the draw ratio side with a lower degree of relaxation is larger, so that the wound package is formed from the filaments on the higher draw ratio side. There is a problem in that micro-pumps occur, which reduces passability during knitting and weaving processes and makes heathering uneven.

Note that the relaxation between the take-up heat set roller and the winder is necessary to adjust the take-up tension in order to obtain a good package, and the take-up tension is increased to avoid loops. Then the package will collapse.

[Problem that the invention seeks to solve]

The present invention solves the problems of such conventional methods,
Two groups of filaments with different dyeability that are simultaneously melt-spun from the same spinneret are once cooled and solidified below 80°C, and then introduced into a heated fluid region where they run with the fluid surrounding the spun yarn. The spun yarn is reheated to above 80°C under the action of a pulling force generated by frictional resistance, and the spun yarn is heated and stretched under the influence of heat and tension to cause crystallization and orientation, and then 4000 to 6000 fi/ The purpose of the present invention is to stably produce polyester discolored mixed fiber yarn with good heathering unevenness and no defects such as μm drop using a method of winding at a high speed of 10 minutes.

[Means for solving problems]

The present invention is a method for producing a mixed yarn with different dyeing properties from two types of polyester filaments having different dyeability. Polyester discoloration characterized in that hot stretching is applied to unstretched aS by arranging two types of unstretched fiber filament groups, successively introducing them into a heated fluid region and drawing them out from the heated fluid region at high speed. This is a method for producing a mixed fiber yarn.

The present invention will be explained in more detail below.

One of the polyester polymers used in the present invention is preferably one in which at least 95 moA/% or more is composed of ethylene terephthalate and has an intrinsic viscosity [η] in the range of 0.45 to α85. The other polyester polymer having dyeability different from this polyester is preferably a polyester polymer containing a copolymer component dyeable to a cationic dye, for example, 5-sodium-sulfoisophthalic acid having a concentration of 1 to 157 μm. Examples include polyethylene terephthalate containing as a copolymer component, but of course the copolymer component is not limited to such a copolymer component.

In addition, titanium oxide, kaolin, metakaolin, etc. are added to these two polyester polymers alone or in combination in a range of 0.1 to 5.0% by weight in order to reduce the frictional resistance between the filament and the guide and suppress fluctuations in running tension. Blending does not impede the present invention in any way, and is rather preferable for stably producing a high quality polyester discolorable mixed fiber yarn. An example of the direct spinning/drawing apparatus used in the present invention will be explained with reference to the drawings. In Fig. 2, the spun yarn (2) melt-spun from the melt spinneret (1) is cooled by a cooling air flow (3), then passes through a convergence guide (4) and further passes through an accompanying air flow separation device ( In step 5), the air flow accompanying the spun yarn is separated and introduced into the heated fluid region (6), where it is heated and drawn.
The fibers are bundled and treated with oil by a spinning oil applying device (7), passed through take-up rollers (8) and (9), and then wound up with a winder and formed into a package α force. Interlacing device I between take-off sheet rollers (8) and (9)!
(2) is provided to provide yarn entanglement.

In the present invention, the yarn immediately after spinning is once cooled to a temperature of 80° C. or lower by blowing cooling air or using a conventional cooling device such as air cooling. It is not preferable to pass the spun yarn before cooling through a heating range at a high temperature higher than the melting point of the polyester polymer, as this will cause unevenness in the thickness of the fibers. In addition, the spun yarn is 8
If the fiber is not cooled to a temperature of 0° C. or lower, the orientation due to hot drawing in the heated fluid region will be insufficient and a satisfactory yarn quality cannot be obtained.

Cooling to a temperature below 80° C. is preferably carried out by blowing pure air at room temperature, but may be carried out in any other manner. The air may be blown in by either a side blowing method, a circumferential quenching method in which air is blown from the outside to the center, or conversely from the center to the outside.

In the present invention, the yarn is then introduced into the heating fluid region, and the point at which the heating fluid enters the heating fluid region may be downstream of the point at which the yarn reaches 80°C or less, but it may occur along the traveling yarn. It is preferable that the position be close to the freezing point of the yarn in order to suppress the convergence of the accompanying air current as much as possible and lower the air resistance against the yarn. Usually, a distance of 1 to 3 m from the spinneret is sufficient.

The device for forming the heating fluid region may be any device as long as it is a non-contact heating device for yarn, but a heating tube with a circular cross section is particularly preferred. The inner diameter of this heating tube must be large enough for the yarn to pass through the tube without contacting it, and
It is preferable to have an inner diameter of 5 to 50 mm per yarn.

The length of the tube must be such that the passing time of the yarn is 11.01~Q.03 seconds, and is preferably 50~300 crn, preferably 150~25 DcWl.

In the present invention, the temperature of the heated fluid region is extremely important, and if the heated yarn temperature is less than 80°C, it will not be drawn under the yarn tension determined mainly by the take-off speed, and the resulting yarn will have a high breaking strength. It exhibits unsatisfactory performance, with a low elongation at break, and a high heat shrinkage rate.

In the present invention, from the viewpoint of the performance of the yarn obtained, it is appropriate that the temperature of the yarn at the outlet of this heated fluid region is 120° C. or higher. On the other hand, if the temperature is too high, fusion of yarns will occur, so there is a limit to this heating temperature in terms of operation. In particular, if the orientation of the yarn before entering the heated fluid region is low, yarn breakage etc. will be significant and the operability will be reduced. Therefore, from this point of view as well, the lower limit of the speed of the take-off roller is restricted, and the take-off speed is 4000 m/min. More than that will be needed.

The heating fluid is preferably air, but may also be air. Further, the heating fluid in the tube may be a stationary fluid except for the accompanying airflow caused by the yarn and the accompanying turbulence, but it is more preferable to actively introduce the heating fluid from upstream or downstream of the yarn.

In addition, in the heated fluid region, the yarn undergoes hot stretching due to the balance between deformation resistance and frictional resistance with the heated fluid, increasing its orientation and crystallization. This can be said to be extremely effective and preferable in slowing down the deformation rate of the yarn and obtaining a fiber yarn with little yarn unevenness and excellent level dyeing properties and strong elongation properties.

In order to prevent the yarn from being disturbed by the air entrained in the yarn and from reducing heating efficiency, it is preferable to separate the accompanying flow of the yarn immediately before introducing it into the heating fluid region.

The accompanying airflow division device may be any device that travels along with the yarn (as long as it has the function of separating the flow from the yarn, but it may be any device that has a small hole in the center for the yarn to travel). A pot-shaped one is the simplest and most suitable for the purpose.

Ceramic is a good material because of its wear resistance. The accompanying air flow separation bag is installed on the upper cover so as to close the hole in the disk-top cover, which has a thread running hole in the center provided on the yarn entry side of the heating tube. The airflow entrained by the yarn is separated from the yarn by this entrained flow separation device and diffused to the outside of the heating tube, hardly entering the inside of the tube. Therefore, the heated fluid inside the tube is not disturbed by the accompanying air current and the inside of the tube is always maintained at a predetermined temperature, so that uniform hot drawing of the yarn can be achieved.

After passing the heated fluid, it is focused by a guide, oiled by a lubricating device, and then taken up by one or a pair of take-up rollers rotating at 4,000 to 6,000 m/min and wound into a wine goo.

The oil to be supplied may be an emulsion type oil with a concentration of 2 to 15% by weight, or a straight type oil mainly consisting of a mixture of mineral oil and a surfactant. A guide type oil supply device is usually used, but a kiss roll type can also be used as long as an appropriate device is installed to cut off the air flow accompanying the yarn. Further, after refueling, processing of the engine, the engine, and the like may be performed. In this case, it is most effective to provide an interlacing device between the pair of take-up rollers, but it is also recommended to install it in combination with an appropriate tension adjustment guide in front or behind the take-up roller. Of course, it is also possible.

The smaller the single yarn fineness of the yarn, the greater the heat treatment effect, so the single yarn denier is preferably 6 deniers or less.

Note that it is not preferable to supply oil upstream of the heating fluid region inlet because heating energy is consumed by latent heat of vaporization of the oil.

In order to obtain fibers with sufficient orientation of the crystalline portions, minimal yarn unevenness, and excellent thermal stability and dyeing properties, the take-up speed should be 4.
oo0m/min or more is required. If it is less than 4000 m/min, the degree of deformation due to hot drawing in the heated fluid region is large, and drawing unevenness occurs between single fibers, resulting in a problem that unevenness in yarn structure such as unevenness in fineness and unevenness in dyeing becomes noticeable. On the other hand, the take-up speed is 60
If it exceeds 0 [] m/min, many spun yarn breakages will occur, and the degree of deformation during hot stretching in the heated fluid region will be small, resulting in a small improvement in mechanical properties, which is not preferable.

In the present invention, it is preferable to raise the temperature of the cooling air stream to 35° C. or higher, since this does not impede the present invention in any way and yarns with less unevenness are formed. Here, the reason for the decrease in thread spots is thought to be as follows. In other words, the thinning behavior of the spun yarn depends on the cooling air temperature and flow rate conditions, but when the cooling air temperature increases, the cooling thinning of the spun yarn progresses slowly, resulting in uniform fineness in the fiber. At the same time as the structure is developed and formed, since the cooling thinning change rate is slow, the thread is less susceptible to external disturbances such as the influence of vibration of the thread, and a thin thread with a little unevenness is formed.

In the present invention, in addition to the above-mentioned method of providing one heated fluid region, the spun yarn, which has been melt spun through a melt spinneret and solidified once cooled to a temperature of 80°C or less, is introduced into a heated atmosphere of 70 to 100°C. without substantially elongating the spun yarn (immediately after preheating, the minimum temperature does not fall below 50°C and the maximum temperature rises along the yarn running direction at 150°C or higher). It is also possible to adopt a method in which the heating atmosphere is provided in two stages, in which the film is passed through a second heating atmosphere with a temperature gradient, hot-stretched, and drawn at a speed of 4,000 to 6,000 m/min.

The drawn fiber thus obtained has a low dry heat or water split heat shrinkage rate and is excellent in thermal stability. That is, (1) the stretching ratio can be varied over a wide range without producing an unstretched portion called necking, which is observed when stretching at a low ratio in a normal stretching method.

(2) High dye adsorption speed and excellent deep dyeing properties. This is due to the low average orientation of the fibers, but the crystallization and orientation of the fine structure of the fibers due to thinning deformation of the yarn in the heated fluid region causes friction due to contact with the heated fluid on the surface of the single fibers. This is attributed to the effect that the shearing force due to resistance is concentrated in the surface layer where it is easy to receive, and that a relatively large number of low-orientation amorphous parts remain inside the single fiber.

In the present invention, two types of filament groups with different dyeability are heated in a heated fluid region at different appropriate stretching ratios in that the running friction resistance force with the fluid and the tension required for stretching are balanced. Because it is stretched, there is no necking, yarn breakage, or single fiber breakage that occurs in conventional methods. In particular, the feature (1) above greatly contributes to the absence of necking.

In the present invention, two groups of filaments having different dyeability are preferably spun from the same spinneret as illustrated in FIG.

In addition, heating and stretching can be carried out by guiding two types of filament groups into the same heating tube like a button, as shown in Figure 4 (→, (ri), or by heating and stretching them by guiding two types of filament groups into the same heating tube as shown in (b). The fibers may be heated and stretched in a heating tube, then doubled and taken off.

In the present invention, the method of discharging two types of filament groups with different dyeability from the same spinneret is to use a composite spinning machine as shown in FIG. 5 and transfer it to a composite spinneret apparatus as shown in FIG. A separate gear pump may be used to meter the molten polymer.

〔Example〕

The present invention will be specifically explained below using Examples.

Examples Polyethylene terephthalate with relative viscosity (metacresol, 25°C) 1.6 s and 5- with relative viscosity 1.50
Sodium-sulfoisophthalic acid as a copolymerization component 2
Two types of polyester polymers, polyethylene terephthalate containing -37 ruthi, were spun using the spinning apparatus shown in FIG. 5 equipped with the spinneret shown in FIG.
From a spinneret consisting of 24 holes of φ and 24 holes for a total of 48 holes, 2
It was spun at 95°C. The spun yarn was cooled using a horizontal blowing type cooling device, with the upper end of the blowout being 10 crn below the spinneret, and air adjusted to 25° C. and 65 cm R) 1 at a speed of α5 m/sec. Spraying over a length of 5 m kept the temperature of the spun yarn below 80°C. The heating tube has an inner diameter of 30 mm and a length of 1.5 m, and a ceramic accompanying air flow separator with a small hole of 5 gm in diameter as a thread passage is installed in the upper part of the heating tube, and dowsome heating is carried out from the outside of the heating tube. The inner wall of the tube was heated to 180°C. The temperature of the running yarn at the exit of the heating tube is 145°C, and the running tension is 57°C.
At y, the fluctuation in tension was small and stable. From the ratio of the thickness of the yarn at the entrance to the trench heating tube and the thickness at the exit, it was estimated that the heating stretching in the heated fluid region was in the range of 1.5 to 1.9 times.

The spinning oil was applied to the yarn at a position 5° (downstream) from the heating tube using an oil supply guide.The oil was an emulsion oil containing 12% by weight of a surfactant component, and the solution viscosity at 25°C was 2. 5cps 0 was used, and the surfactant component was measured to be α5mm% with respect to the yarn.A pair of two take-up rollers were used, and the same speed was 500mm.
orIL/min. The take-up roller was a so-called zebra roller whose surface had mirror-finished parts and pear-shaped parts alternately repeated four times in the circumferential direction in the axial direction of the roller to improve yarn separation. A yarn entangling device was installed between the two take-up rollers, and an air pressure of 5 kg/cm was used to provide 25 entangled yarns/m. A winder manufactured by Barmark was used to wind the film at a tension of 1oI. The yarn quality of the heterochromatic mixed fiber yarn thus obtained is shown in the following table. The resulting package was free of p-bubbles and fluff, and no problems occurred in the unwinding model test at 1 o Om/min as illustrated in FIG.

When this yarn was woven and dyed with a cationic dye (Sumiakujirupu M: manufactured by Sumitomo Chemical Co., Ltd., flit), a finely grained fabric with good curling quality was obtained.

Comparative Example A polyethylene terephthalate (V-) having a relative viscosity (metacresol, 25 DEG C.) of 1.63 was directly spun and drawn using the apparatus shown in FIG. The spinneret was the same as in the example and the discharge was ff1401! /min at 295°C. The spun yarn was cooled using a side-blowing type cooling device so that the upper end of the blowout was 10 degrees below the spinneret, and at 25°C and 65JR.
Air adjusted to H was blown over a length of 1.5 m at a speed of α51 rL/sec, and the temperature of the spun yarn was kept at 60° C. or lower.

Next, a spinning oil was applied to the yarn using a kiss roller, and then the yarn was continuously heated to 80°C, wound 5 times around a drawing roller rotating at a circumferential speed of 2000 m/min, and then heated to 150°C at a circumferential speed of 5000 m. It was wound 10 times around a pair of take-up rollers that rotated at a speed of 10 minutes, stretched 2-5 times between the stretching roller and take-off roller, and then wound up with a tension of 10 g and 48407 FLZ using a barmark wine goo. . A yarn entangling device is installed between the take-off sheet roller and the wine goo, and the yarn entanglement device is installed between the take-off shear roller and the wine goo, and the yarn entanglement device is installed to generate 25 yarns/thread with an air pressure of 8 kg 7 cm.
m confounding was given. The spinning oil is an emulsion oil that contains 12 parts of a surfactant component and has a solution viscosity of 2.5 cps at 25°C, and 0.5 weight of the surfactant component is attached to the yarn. The rotation speed of the kiss roller was adjusted as follows. In addition, the tension of the traveling yarn was adjusted using a yarn convergence guide under the kissing roller to suppress the shaking of the yarn on the drawing roller and to prevent the yarns from overlapping. The yarn quality of the mixed fiber yarn thus obtained is shown in the following table. A large number of loops were observed in the resulting package, and when an unwinding model test was conducted at a speed of 1000 m/min, thread breakage occurred frequently.

Furthermore, when this yarn was woven and dyed with a cationic dye (same as in the example), unevenness in curling, which was thought to be caused by μm, was observed, and only a coarsely heathered fabric could be obtained.

Table [Effects of the Invention] As described above, according to the present invention, it is possible to extremely efficiently produce a polyester discolorable mixed fiber yarn suitable for use in clothing that is free of loops and fuzz.

[Brief explanation of drawings]

Figure 1 shows two types of filament groups (A:
Figure 2 is a schematic diagram of an example of a direct spinning/drawing apparatus used in the present invention;
The figure is a perspective view of an example of a spinneret used in the present invention, FIG. 4 is a schematic diagram of another example of a direct spinning and drawing device used in the present invention, FIG. 5 is a schematic cross-sectional view of a composite melt spinning device, and FIG. 6 7 is a schematic cross-sectional view of a composite melt spinneret, FIG. 7 is another example of the heating tube of the direct spinning/drawing device used in the present invention, and FIG. 8 is a diagram showing combinations of hole shapes of the spinneret used in Examples. FIG. 7 is a schematic diagram of an unwinding test device for a drawn fiber package, and FIG. 8 is a schematic diagram of a conventional direct spinning and drawing device used in a comparative example. 1: Spinneret 2: Spun yarn 2a: Filament 12b with low appropriate drawing ratio:
〃 Tall filament 13: Cooling airflow 4: Focusing guide 5: Separation device for entrained airflow 6, 6. , 62: Heating fluid area (heating tube) 7v 7. ,7
2: Spinning oil application device 8.9: Take-off roller 10: Interlace 11: Package 12 2-take-off roller 13: Oil supply device (kinu roller) 14: Focusing guide 15: Stretching roller 16: Take-off roller 17: Extruder 18: Spinning head 19: Spinneret 20: Composite spinneret front plate 21: Composite spinneret 4th station * 2 station 3 station 5 Figure 2b 2a Plan 6 station

Claims (1)

[Claims] In a method for producing a mixed yarn with different dyeing properties from two types of polyester filaments having different dyeability, the polyester filaments are melt-spun from the same spinneret and cooled by a cooling air stream, and each have different dyeability. A polyester discolorable blended fiber characterized in that two types of undrawn fiber filament groups are aligned, successively introduced into a heated fluid region, and drawn from the heated fluid region at high speed to subject the undrawn fibers to hot drawing. How to make yarn.