JPS6343300B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention has very little internal distortion due to winding positions such as between the inner, middle, and outer layers of the package, or between the center and end surfaces, and has a uniform and evenly dyed yarn quality. The present invention relates to a method for winding polyester fibers that has little change in yarn quality over time and can be put to practical use as is. [Prior Art and its Problems] Generally, most of the polyester fibers that can be put to practical use are supplied on the market as pear-shaped or cheese-shaped packages. However, these polyester fibers have a large difference in internal strain depending on the winding position of the package, especially between the end faces and the center of the package. A problem arises in that spots are likely to occur and the quality of the woven or knitted fabric is significantly degraded. For this reason, it tends to have limited uses and lack versatility. When we investigated the cause of this, we came to the following conclusion. (1) When winding a cheese-shaped package, it is necessary to traverse the yarn at high speed using a traverse guide that reciprocates at high speed. For this reason, the effective winding tension at both ends of the traverse is higher than that at the center, causing excessive strain in the yarn. In addition, a large impact force is applied to the yarn due to the sudden turn of the traverse guide, and yarn pooling is likely to occur at both end surfaces, making it easy for large distortions to occur. Therefore, both end faces are in a state of large internal strain from the time the winding is started. This tendency is amplified as the winding speed increases, since the traverse speed also increases accordingly. (2) A pirn-shaped package is generally wound by a drawing method using a draw-twisting machine. When winding,
Since the spindle rotational speed is nearly constant, the rotational speed of the traveler changes with the amount of winding, so the actual winding tension changes. For this reason, different strains are imparted to each layer of yarn at the time of winding. Furthermore, in the case of a pirn shape, since the tightening force of the thread differs depending on the winding position, the rate and amount of relaxation of the internal strain after winding differs especially between the end faces of the pirn and the center, and the magnitude of the residual internal strain is amplified over time. (3) Relaxation of internal strain after winding occurs in both paan-shaped and cheese-shaped packages, but this occurs when the tension of the amorphous part of the wound yarn is higher, that is, when the degree of orientation of the amorphous part is higher. The more wound the thread is, the easier it is to relax. For the above reasons, when knitting and weaving a woven or knitted fabric and subjecting it to heat treatment, the fixed strain is released and the amount of strain differs, causing problems such as sink spots and dye spots. In order to solve these problems, we conducted various studies and found that the yarn of the wound package was measured in the direction of the fiber axis: degree of crystal orientation of the yarn fc fc≧0.85 degree of crystal orientation of the yarn fa fa≦0.50 The variation range ΔT of the stretch tension value during 4% stretching was 0.1 g/d.
Below, the difference R between the average values of the stretch tension values at the center part and end face parts of the package is 0.1.
It has been found that the problem can be solved by adjusting the physical properties to less than g/d. However, it was found that special winding conditions were required to obtain a polyester fiber having the above-mentioned physical properties and capable of withstanding practical use, and as a result of further study, the present invention was arrived at. [Object of the invention] That is, the object of the present invention is to
It has very little internal distortion due to the winding position between the middle and outer layers, or between the center and end surfaces, and has a uniform and evenly dyed yarn quality, and has the above-mentioned desired physical properties with little change in yarn quality over time, making it practical. The purpose of this invention is to propose a method for winding polyester fibers that can withstand high temperatures. [Structure of the Invention] In other words, the present invention melt-spun a polyester polymer, discharged it from a spinneret, cooled it, solidified it, applied an oil agent, and applied an interlacing treatment to the yarn without substantially imparting actual twist. In the winding method,
A spindle drive type winder is used as the winder, and the package being wound is completely non-contact with other objects, and the traverse speed T (cm/sec) is set at V/2400≦T≦V/180 [ V: Winding speed (m/min)] While traversing the yarn with a slow traverse that satisfies the winding speed (m/min), the winding speed is 5000 m/min or more, and 0.5 g/d.
This is a method for winding polyester fiber, characterized by winding it with the following tension. The present invention will be explained in detail. The winding speed must be 5000 m/min or more. A winding speed of 5500 m/min or higher is preferred. The yarn spun at a high speed of 5000 m/min or more has a crystalline orientation fc of fc≧0.85 (preferably fc≧0.88) and an amorphous orientation fa of fa≦0.50 (preferably The yarn has an internal structure of fa≦0.4), and the intermolecular forces in the crystalline parts are strong and strong, so it can be used for practical purposes as it is spun. If the speed is less than 5000 m/min, the yarn will not be able to withstand practical use due to its high elongation and high shrinkage. It is necessary to wind up such a yarn spun at a high speed of 5000 m/min or more in such a manner that strain is not imparted as much as possible during winding, and the amount of strain imparted does not vary depending on the winding position. For this reason, it is necessary to use a spindle drive type winder as the winder, and to wind the package in a completely non-contact state with other objects. Even with a spindle drive winder, it is not advisable to use roller veils that contact the package in order to control the winding speed, for example. Even for other purposes, if there is a roller-like object that comes into contact with the package cage, it will press down the package cage with a certain amount of surface pressure, which will cause the wound yarn to be pressed against each other and cause extra strain during winding. Since the threads overlap excessively, the unwinding property becomes poor. That is, in the present invention, it is important that the package being wound does not come into contact with any other object. Therefore, in order to control the winding speed, the winding tension is detected and the spindle rotation speed is decreased according to the amount of winding to maintain a constant tension, or the pattern of decrease in the spindle rotation speed is memorized in advance. Program control or the like is applied to reduce the number of rotations depending on the winding time. The present invention uses such a spindle drive type winding machine, and gradually decreases the winding width as the yarn diameter of the package increases, and adjusts the trapper speed T (cm/sec) to V/2400≦T≦V/180. It is necessary to wind it with a slow traverse in between. However, V is the winding speed (m/
min). If the traverse speed T is faster than V/180 (cm/sec), the traverse speed is too fast, which increases the winding tension on both ends of the package and tends to cause thread accumulation, resulting in a large impact force when turning the package. This results in large distortion during winding. When the traverse speed T is less than V/2400 (cm/sec), the deviation due to traverse between the previously wound yarn and the next wound yarn on the package surface is small;
The threads are too close together. For this reason, tension fluctuations during unwinding are large, causing problems in higher-order processes. In order to reliably solve the above problem, the traverse speed is preferably controlled within the range of V/1800≦T≦V/300 (cm/sec). By sequentially decreasing the winding width as the winding diameter of the yarn increases, a preferable taper angle can be imparted to the package, and a stable package form can be formed. In addition, it is necessary to perform an interlacing treatment on the yarn before winding it to improve the cohesiveness of the yarn. By performing the interlacing treatment during spinning, it is possible to prevent abnormally high strain or stress from being applied to each single yarn during winding. The degree of entanglement is achieved by providing a disturbance that slightly disturbs the parallelism so that the filaments are not completely parallel. Preferably, the number of entanglements on water is 1 piece/m or more
Approximately 70 pieces/m is sufficient. The positions where the interlacing process is performed are in front of the first godet roller, between the first godet roller and the second godet roller.
It can be arbitrarily selected between the godet rollers or between the second godet roller and the winding machine depending on the purpose. In particular, from the viewpoint of uniformity of the number of entanglements and operability, it is preferable to install it before the first godet roller. In this way, the present invention has developed a method for obtaining polyester fiber packages having desired physical properties.
This can only be achieved by winding yarn spun at a high speed of min or higher under specific winding conditions such as traverse speed. On the other hand, undrawn yarn (lowly oriented, low crystalline yarn)
The drawn yarn obtained by the drawn yarn winding method in which the yarn is supplied and drawn in a draw-twisting machine to produce a drawn yarn, or the direct spinning and drawing method in which spinning and drawing are made continuous, has a high Since the yarn is oriented, the orientation relaxation of the amorphous portion after winding is large, causing stress distribution in the package over time, causing the above-mentioned problems, and is therefore not applicable to the present invention. . Further, even if the winding speed is simply set to 5000 m/min, the yarn of the wound package will not have the desired characteristics unless the yarn is wound under the winding conditions specified in the present invention. The present invention also cannot be applied to a surf ace drive type winder, which is widely used as a spinning winder, in which the package is brought into contact with a drive roll to wind it, or a cheese winder, which winds the package into a cheese shape. In particular, as mentioned above, when winding into a cheese shape, due to the frictional resistance with the traverse guide that traverses at high speed and the impact force at the time of sudden turning, the winding tension at both ends of the package is actually lower than the center of the package. This may cause excessive strain on the yarn,
It has the disadvantage of deteriorating the package form. In particular, it cannot be applied to winding for high speed spinning of 5000 m/min or higher. In order to make the polyester fibers wound around the package more uniform, it is more effective to take into consideration the tension during winding and the bobbin diameter. In other words, since the relaxation of strain after the package is made depends on the tightening force, it is preferable to lower the tightening force as much as possible. Generally, the tightening force p of the package is expressed at a distance r from the center of the package as p=T(r)/r [T(r): winding tension], and it is preferable to decrease the value of p. Specifically, the winding tension T(r) is lowered or the radius of the innermost layer portion is increased. In other words, it is conceivable to increase the bobbin diameter. From this, it is essential that the winding tension T(r) is 0.5 g/d or less, more preferably 0.3 g/d or less. The bobbin diameter is preferably 2 inches or more from the viewpoint of production efficiency. An example of an embodiment of the winding method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of the spinning and winding process according to the present invention. The polyester yarn Y melted and discharged from the nozzle 1 is cooled and solidified while passing through the cooling device 2.
After passing through the oil supply device 3 and being appropriately entangled by an interlaced nozzle 6, it is taken over by a pair of first godet rollers 4 and second godet rollers 5 that rotate at a circumferential speed of 5000 m/min or more. The yarn coming out of the second godet roller 5 passes through a fixed traversing fulcrum 8 and a traverse guide 9 that reciprocates, and then is sent to a winding device 10 into a pirn-shaped package cage 15.
It is wound up at a speed of m/min or higher. The winding device 10 is of a spindle drive type and is independently driven by a drive motor 11. The drive motor is controlled via a tension detector 7 that detects the winding tension and a control panel 14. The drive motor is controlled by a control panel 14 consisting of a power controller 12 and a tension setting device 13 so that the winding tension is constant, and the winding speed is always controlled to be constant. The rotating package 15 is rotated without contacting anything. In the present invention, polyester means a polyester having ethylene terephthalate units as the main repeating unit, and polyethylene terephthalate is the main target, but copolyesters containing 80 mol% or more of polyethylene terephthalate may also be copolymerized with a third component. good. Moreover, the cross-sectional shape of the polyester fiber can be applied to various known irregular cross-sections from a round cross-section. [Effects of the Invention] The polyester fiber package obtained by the spinning and winding method of the present invention has an amorphous part orientation lower than 0.50 and a crystal orientation degree of less than 0.50.
Since it is higher than 0.85, it is uniform over the entire package, so the heat setting effect is high, and heat setting unevenness due to the winding layer of the package is small. Above all, it is the best yarn for high twisting applications. Since the take-up speed is 5000 m/min or more, it exhibits high productivity and can significantly reduce the yarn manufacturing cost. The variation width ΔT of the stretch tension value during 4% stretching measured in the fiber axis direction is 0.1 g/d.
or less (preferably 0.07 g/d or less), and the difference R between the average values of the center and end portions of the package with the same stretch tension values as above is 0.1
g/d or less, making it an extremely uniform yarn. A package having desired characteristics such as the following can be obtained. EXAMPLES Hereinafter, in order to make the present invention more clear, specific examples will be described, and the measured values used in the examples were obtained by the following measurement method. (1) Regarding crystal orientation fc fc, Kure and Kubo's
39, 929 (1939) using the following formula. fc=180−H ₍₀₁₀₎ /180 Here, H ₍₀₁₀₎ is determined by the X-ray diffraction method.The detector is set at the (010) diffraction peak position on the equator line, and the sample is rotated at 8°/min within the sample plane. It can be measured by Let H(010) be the half width of the intensity distribution curve of (010). Note that the X-ray diffraction conditions are the following general conditions. Cukα radiation (using Ni filter) Output: 35KV-15mmA Slit system: 2mmφ pinhole goniometer: Rigaku Denki Light receiving slit: 1 x 1'mm Time constant: 1sec (2) Degree of amorphous orientation fa Calculate using the following formula. fa=Δn−0.212fcXc/0.1986(1−Xc) where Δn is the birefringence index of the fiber measured by the compensator method using a polarizing microscope. However, in the case of threads with irregular cross-sections, the measurement is carried out by the interference microscopy method described in JP-A-48-35112. Xc: Crystallinity calculated from the density ρ determined by the density method using the formula Xc=ρ−1.335/0.12. If TiO ₂ is contained, TiO ₂ correction is performed. fc is the degree of crystal orientation in term (1). (3) Variation range ΔT of stretch tension value during 4% stretching The model diagram of the measuring device for measuring ΔT is shown in the second
As shown in the figure. The test yarn 17 unwound from the package 16 is
After passing through the guide 18, the primary tension is adjusted to 0.1 g/d by the tension adjusting device 19, and between the constant speed rollers 20 and 22, the dancer roller 21 and the load 2 are
After applying a load of 0.2 g/d and adjusting the tension to a constant tension with rollers 2 and 1',
The roller 24 is continuously run at a surface speed of 80 m/min while being stretched by 4% between 2 and 24. At this time, the tension fluctuation in the extension part is detected by the pick-up 23 and recorded at a chart speed of 60 m/min. In the figure, f is a frictionless roller,
S represents a separate roller, and 25 represents a winder. FIG. 3 shows an example of a chart obtained by measurement using the apparatus shown in FIG. Select 5 of the largest tension fluctuation ranges within a chart length of 15 cm at any part, and calculate ΔT ₁ , ΔT ₂ ...
... Assuming ΔT ₅ , its average value ₅ 〓 ⁱ⁼¹ ΔTi/5 is set as ΔT during fluctuation. (4) Difference R between the average values of the stretch tension values at the center and end portions of the package during 4% stretching. Measured using the same device shown in Figure 2 as used for the ΔT measurement. FIG. 4 shows a typical stretch tension chart, where t is the part wrapped around the end face of the package and p is the part wrapped around the center part of the package. As shown in Figure 4, the average value of the stretch tension values at the end portions is Xt, and the average value of the stretch tension values at the center portion is R = |
Calculate by Xt−|. Example: Melt polyethylene terephthalate with intrinsic viscosity [η] = 0.61 at a spinning temperature of 290°C, and use a spinneret with 24 holes with a diameter of 0.3 mm to obtain a discharge amount such that the total denier of the wound yarn is 50 denier. It was melt spun. The spinning winding device shown in Fig. 1 was used, the winding speed and winding traverse speed were varied as shown in Table 1, and the yarn was wound into a pirn shape at an entangling pressure of 3 kg/cm ² . The taper angle was 20° and the winding tension was constant at 0.15 g/d. The conditions and the yarn physical properties of the obtained package were determined first.
Shown in the table. In the table, R ₃ is the value over time for 3 months after spinning.
Other yarn physical properties showed values immediately after spinning. [Table] Established.
In the table, levels No. 1, 3 and 9 are comparative examples to clarify the effects of the present invention, and are respectively
These are examples of low winding speed, high traverse speed, and low traverse speed. Nos. 2, 4 to 8 according to the present invention are fa≦
0.50, fc≧0.85, ΔT≦0.10g/d, R and R ₃ ≦
Even if it satisfies 0.10g/d and is made of grained fabric,
It has no defects and is of excellent quality. On the other hand, Comparative Example No. 1 has fc, No. 3 has R ₃ , and No. 9
The unwinding properties are insufficient, and when made into a textured fabric, sink-like defects occur. Furthermore, in order to check the quality of the fabric, threads Nos. 1 to 8 were
After twisting to 2500T/m and heat setting in 60℃ hot water,
The fabric was made into a vertical and horizontal fabric, and a grained fabric was obtained by generating a grain torque in a steam bath. The textile quality is shown in Table 1. In Nos. 2 and 4 to 8 of the present invention, very uniform and good textured fabrics were obtained, but in Nos. 1 and 3, sink-like defects were observed. Comparative example Polyethylene terephthalate with intrinsic viscosity [η] = 0.61 was melted at a spinning temperature of 290°C, and the denier of the drawn yarn was
Samples 1 and 2 were obtained by melt spinning and winding under various conditions at a discharge rate of 50 denier. <Sample 1> The thread discharged from the spinneret is cooled and solidified, coated with oil, taken up at a speed of 1000 m/min by a pair of Nelson-type heated rollers heated to 85°C, and then heated to 160°C. After stretching to 3.5 times with a pair of Nelson-type heating rollers, a spindle drive type winder similar to that in Example 1 was used at a traverse speed of 10.
It was wound into a pirn shape with a taper angle of 20° at a speed of 3500 m/min in cm/sec. <Sample 2> The winding speed was adjusted using the equipment shown in Figure 1 except for the winding machine.
High-speed spinning was performed at 6000 m/min. The winder is manufactured by Toray Engineering Co., Ltd.
A TW601 cheese winder was used. Pickup speed 6000
It was wound up at a traverse speed of 3230 cpm at m/min. The obtained yarn physical properties are shown in Table 2. [Table] In sample 1, the fa of the yarn obtained is too large, and the R after aging becomes large, resulting in so-called pern marks, which lowers the quality of the fabric. Furthermore, the heat set temperature
A grained fabric was prepared in the same manner as in Example 1 except that the temperature was changed to 85°C, but the grains that were produced had severe sink-like defects and were of poor quality. In sample 2, the impact is applied to the yarn at a high traverse speed, so the R of the yarn becomes large. In addition, Example 1
The textured fabric obtained in the same manner as above had sink-like defects with the same period as the end face of the package and was of poor quality. As described above, if both the spinning conditions and the winding conditions are not satisfied, a fabric of good quality cannot be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the spinning and winding process according to the present invention. FIG. 2 is a model diagram of a measuring device for measuring ΔT and R in the present invention, and FIG. 3 shows an example of a chart obtained by measuring ΔT with the device shown in FIG. FIG. 4 shows a chart of stretch tensions measured by the apparatus shown in FIG. 2 for calculating R. 1: Mouthpiece, 2: Cooling device, 3: Oil supply device, 4:
1st godet roller, 5: 2nd godet roller,
6: Interlace nozzle, 7: Tension detector, 8:
Traverse fulcrum guide, 9: Traverse guide, 1
0: Winding device, 11: Motor, 12: Power controller, 13: Tension setting device, 14: Control panel,
15: Package.

Claims (1)

[Claims] 1. A method of melt-spinning a polyester polymer, discharging it from a spinneret, cooling and solidifying it, applying an oil agent, and winding the yarn while subjecting it to an entangling treatment without substantially imparting actual twist. In this case, a spindle drive type winder is used as the winder, the package being wound is completely non-contact with other objects, and the traverse speed T (cm/sec) is set at V/2400≦T≦V/180[ V: Winding speed (m/min)] While traversing the yarn with a slow traverse that satisfies the winding speed (m/min), the winding speed is 5000 m/min.
A method for winding polyester fibers, the method comprising winding at a tension of min or more and 0.5 g/d or less.