JPH0341563B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improved method of manufacturing polyester multifilaments. More specifically, it relates to a method for producing polyester multifilament that allows the target oil to adhere to the wound yarn even at high spinning speeds in the melt-spinning process of polyester polymers, and that also achieves high operability without fuzz or single fiber breakage. be. Conventionally, polyester fibers have been coated with oils depending on the purpose of high-order processing. For example, in the false-twisting process, a predetermined amount of oil is applied to prevent fuzz and white powder from being generated due to abrasion of the yarn on the false-twisting spindle, and to prevent the oil from turning into tar on the false-twisting hot plate. must be well controlled. In other words, if the amount of oil adhered to the yarn is too small, fluff and white powder will occur frequently on the false-twisting spindle, and if the amount is too large, problems such as increased taring and dirt on the false-twisting hot plate will occur. Therefore, it is important that the oil agent suitable for the high-level application is evenly applied in the desired amount. Generally, in order to improve process passability in a spinning process or a higher-order processing process, a predetermined amount of oil is applied to the yarn in the spinning process and the yarn is wound up. Furthermore, in addition to relying only on oil agents, it is also practiced to perform an interlacing treatment on the yarn using an air jet nozzle. For example, JP-A-53-114919 and JP-A-Sho.
Japanese Patent No. 53-139816 discloses a technique in which a relatively small amount of oil is applied before the entanglement treatment during spinning, and after the entanglement is performed by turbulence, a sizing agent is further applied and the yarn is wound. It is true that in order to maintain good fiber opening properties during entanglement and to increase the effectiveness of turbulence, it is better to have a smaller amount of the converging oil agent attached. However, in recent years, spinning speeds have increased, and the degree of abrasion that the yarn receives from guides is severe, resulting in fuzz and white powder, and in extreme cases, single yarn breakage. . Therefore, in high-speed spinning where the spinning speed exceeds 5000 m/min, the amount of oil applied to the yarn before the entanglement treatment needs to be relatively larger than in low-speed spinning. Furthermore, in the high-speed region, the influence of accompanying airflow generated around the yarn becomes large, and unless the convergence is particularly improved, it is difficult to maintain uniform spinning tension. Therefore, it is an important issue to achieve an appropriate amount and uniformity of the amount of oil deposited. In view of these problems, the inventors of the present invention have conducted intensive studies on how to achieve a spinning method that allows the target oil to adhere to the wound yarn and does not cause fuzz or single yarn breakage. has been reached. That is, in the present invention, a polyester polymer is melt-spun, and after the yarn is cooled and solidified, an oil agent is applied to the yarn using an oil agent applying device, and then an oil agent is applied to the yarn when winding it up with a winding device via a take-up roller. The amount (A) (weight% of the yarn weight) should be set to the amount (B) (weight% of the yarn weight) applied to the winding yarn so that the following equations are simultaneously satisfied, and an air jet is applied before the winding device. This method of producing a polyester multifilament is characterized in that a part of the oil agent is removed using an et nozzle, and the amount (B) of the oil agent attached to the wound yarn is 0.6% by weight or more and 1.5% by weight or less. 1.2×B≦A≦2.0×B A≧1.0 Next, the constituent elements of the present invention will be explained in detail. The polyester polymer referred to in the present invention is mainly a polyethylene terephthalate homopolymer, and contains 85 mol% polyethylene terephthalate.
A copolymer containing the above may also be used. The most important thing in the present invention is that when applying oil to the yarn using the oil applying device, the amount of oil applied is 1.2 to 2.0 times the target amount of oil applied to the winding yarn, and the amount of oil is applied once before winding. This method involves removing part of the oil using an air jet nozzle to control the amount of oil that adheres to the winding yarn. Note that the amount of oil applied here is the amount of oil applied to the yarn (% by weight relative to the weight of the yarn) immediately after the oil application device (before fluid treatment by the air jet nozzle), and is the amount of oil applied to the yarn (% by weight relative to the weight of the yarn). It can be determined by measuring the output voltage corresponding to the resistance change of the running yarn using a meter. In addition, the amount of oil attached to the winding yarn refers to the amount of oil attached to the yarn after it has been wound (% by weight relative to the weight of the yarn). It can be determined by measurement. The present inventors conducted various studies on what factors are most important in order to achieve a process in which fuzz and single yarn breakage do not occur during high-speed spinning. As a result, we found that the amount of oil applied is a major point. The amount of oil applied is 1.0% by weight or more based on the weight, and the amount of oil applied is in excess of 1.2 to 2.0 times the target amount of oil applied to the winding yarn depending on the application, and the oil is applied using an air jet nozzle. It has been found that by reducing the amount, it is possible to achieve a process that does not generate fuzz or single yarn breakage.
If the amount of oil applied is less than 1.0% by weight based on the weight of the yarn, the absolute amount of oil is small, so before the yarn is entangled, it is When running in contact at high speed on guides (simply referred to as guides), fuzz and single thread breakage are likely to occur. Furthermore, since the convergence of the yarn is reduced, the spinning tension becomes high and the fluctuation of the spinning tension becomes large, which is not preferable. Also, the amount of oil applied is 1.2 of the target amount of oil applied to the winding yarn.
If it is less than twice as much, there will be less excess oil, so it is necessary to lower the air pressure of the air jet nozzle, which will reduce the uniform adhesion of the oil, and will not be able to provide a high degree of entanglement, resulting in poor passage through higher processing steps. This is not desirable as it tends to worsen. In addition, if the amount of oil applied exceeds 2.0 times the target amount of oil applied to the winding yarn, the amount of oil that must be removed by the air jet nozzle will be too large, resulting in a large amount of oil mist, which is unfavorable in terms of environmental hygiene. . As mentioned above, by applying an oil agent 1.2 to 2.0 times the target amount of oil agent attached to the wound yarn, it is possible to prevent the occurrence of fuzz and single yarn breakage during the spinning process. If the yarn with the oil still attached is wound into a package as it is, and the package is supplied to a higher-order process, a large amount of the oil will fall off in the higher-order process, contaminating the warping machine or loom. This problem arises. The inventors of the present invention have carried out various studies aimed at preventing this drawback, and as a result, we have found that the yarn is protected with a large amount of oil before it passes through the guides where fuzz is likely to occur during the spinning process, and the yarn passes through the guide portion. We discovered that it is effective to reduce the amount of oil to a predetermined amount. That is, we have found a method to effectively control the target amount of oil adhesion and to ensure uniform adhesion by removing part of the oil using an air jet nozzle before the winding device. The air jet nozzle uses a compressed air flow to remove part of the lubricant, and in order to control the target amount of lubricant adhesion, set the air jet nozzle's air pressure appropriately, taking into account the yarn tension during running, etc. . In other words, the higher the compressed air pressure, the greater the energy of the compressed air flow, which makes it possible to remove a large amount of oil, and the lower the yarn tension, the greater the freedom of vibration of the yarn running inside the air jet nozzle. Because it is large,
It is possible to remove a large amount of oil. It is important that the thus controlled amount of oil applied to the wound yarn is 0.6% by weight or more and 1.5% by weight or less, and preferably 0.6% by weight or more and 1.2% by weight or less based on the yarn weight. If the amount of oil attached is less than 0.6% by weight, when the wound yarn is fed to a higher process, it may fuzz on the warper or break on the loom due to the high coefficient of friction between yarn and yarn and yarn and gold. A problem occurs. In addition, if it exceeds 1.5% by weight, the oil will fall off on the warping machine or loom, or in the scouring or dyeing bath, resulting in greater contamination in higher steps.
Must be less than % by weight. The oil agent used in the present invention is preferably an aqueous emulsion oil agent with a concentration of 3% by weight or more and 15% by weight or less in order to improve uniform adhesion and cohesiveness.
More preferably, it is an aqueous emulsion oil containing 5% by weight or more and 12% by weight or less. If the oil concentration is less than 3% by weight, the water content is too large, which causes large evaporation of water at the end faces of the package, which is undesirable because thread unevenness is likely to occur at the end faces of the package in subsequent processes (such as the stretching process). Also, the oil concentration is 15% by weight.
If it exceeds 20%, the uniform adhesion of the oil agent tends to decrease, which is not preferable. In addition, the viscosity of the oil agent used in the present invention is preferably low in terms of ease of entanglement in the air jet nozzle and ease of oil removal.
less than 3 centipoise, more preferably 2 centipoise in
Centipoise or less can be suitably used. The lubricant application device used in the present invention may be of any type, such as an oiling roller type or a guide lubricant type, as long as it can apply a predetermined lubricant, but a metering guide lubricant type is preferred because it can uniformly apply the lubricant. It is preferable that the entire inner circumferential wall of the yarn passage section of the air jet nozzle used in the present invention be constructed of a ceramic member, since fuzz and single yarn breakage can be more effectively prevented. High purity alumina, zirconium oxide, carbon silicon, silicon nitride, etc. can be used as the ceramic member. In the present invention, when the spinning speed is 5000 m/min or more, the internal structure of the discharged yarn becomes extremely dense, and crystallization is promoted to the extent that the shrinkage rate in boiling water is 10% or less, and the yarn becomes susceptible to abrasion with the outside. On the other hand, the spinning speed is preferably 5,000 m/min or more, more preferably 5,500 m/min or more, since toughness increases and fuzz and single fiber breakage tend to be less likely to occur. In the present invention, it is essential to remove a portion of the oil agent using an air jet nozzle, and if the removed oil agent mist adheres to the take-up roller immediately before, the stability of yarn running will decrease, and as a result, the yarn will not reach the take-up roller. It is preferable to store the air jet nozzle in a box because the thread winds backwards and the thread is likely to break. Further, it is more preferable to connect a device for sucking the oil mist inside the box. Note that JP-A-54-38953 discloses a nozzle box that three-dimensionally surrounds an air jet nozzle, but the purpose of this box is to block the noise generated from the air jet nozzle, and the present invention does not cover the nozzle box. It is not designed to suck up the excess oil that has been removed. Further, it is preferable to provide a blocking plate between the air jet nozzle and the take-up roller to prevent oil from adhering to the take-up roller, or to combine both the nozzle box and the blocking plate. Further, it is preferable that the distance between the blocking plate and the air jet nozzle is 70 cm or less in order to further improve the effect of the blocking plate. Further, it is preferable that the blocking plate be installed near the take-off roller so as to bend the flow of compressed air from the air jet nozzle to the opposite side of the take-off roller. In the present invention, it is preferable to use an interlace nozzle capable of interlacing the yarns as the air jet nozzle. When the winding yarn is entangled, the unwinding property of the yarn from the package improves, as well as the ability to pass through higher-order processes. Therefore, an interlaced nozzle is used as an air jet nozzle to partially remove the oil agent. At the same time, it is preferable to provide interlacing to the yarn. In addition, as an air jet nozzle, an interlaced nozzle stored in a nozzle box is used.
Suction of excess oil removed by compressed air flow was carried out. Next, embodiments of the present invention will be described using the drawings. FIG. 1 shows one example of a preferable spinning device used in the present invention. In FIG. 1, 1 is a spinneret, and 2 is a spun yarn. After the spun yarn 2 is cooled and solidified, the oil application device 3 coats the spun yarn 2 with a target amount of 1.2 of the oil applied to the wound yarn.
An oil agent of twice to 2.0 times is applied and the focusing guide 10,
After passing through the guide guide 11 and the first take-up roller 4, a part of the oil is removed between the winder 9 and the second take-up roller 5 immediately before it using the interlaced nozzle 7 as an air jet nozzle, and the target winding yarn is removed. The amount of oil applied is controlled, and the film is wound onto a winder 9 via a traversing fulcrum guide 8. Second take-up roller 5 and interlace nozzle 7
In order to prevent oil from adhering to the second take-up roller and to bend the flow of compressed air from the interlace nozzle 7, it is preferable to provide a blocking plate 6 as shown in FIG. As described in detail above, according to the present invention, it is possible to prevent the occurrence of fuzz and single yarn breakage even in the high-speed spinning process, and high operability can be obtained, as well as desired oil adhesion depending on the application. This has the remarkable effect that a wound yarn having a certain amount of volume can be obtained. Further, according to the present invention, since the amount of oil applied to the winding yarn can be well controlled, a large amount of oil can be supplied, and the yarn can be highly bundled. Therefore, the spinning tension can be lowered, and fluctuations in the spinning tension can also be reduced. The present invention will be explained in more detail below using Examples. Example 1 Polyethylene terephthalate chips containing titanium oxide with [η] = 0.64 were spun at a temperature of 290°C, a discharge amount set so that the denier of the wound yarn was 75 denier, the number of spinner holes was 36, and the oil concentration was 8 weight. % and other conditions shown in Table 1 using the apparatus shown in FIG. 1 to obtain the results shown in Table 1.

【table】

[Table] Experiment Nos. 1, 4, 8, 9 and 12 in Table 1 are comparative examples for clarifying the present invention. In Table 1, experiments Nos. 1 to 3 were conducted by changing the spinning speed and the amount of oil applied.
In Experiment No. 1, the amount of oil applied was less than 1% by weight, and since the yarn ran on the guides at high speed, there was a large amount of fuzz and single yarn waste adhering to the guides and the interlacing nozzle. Many fluffy ends were also observed on the surface and end surfaces of the removed package cage. Experiments Nos. 4 to 8 in Table 1 are experiments in which the amount of applied oil was changed and the ratio to the amount of applied oil was changed.
In Experiment No. 4, the amount of oil applied was less than 1% by weight and less than 1.2 times the amount of oil applied on the winding, so there was fluff on the guides, and fluff was on the surface and end of the wound package. were occurring frequently. Also experiment No.8
The amount of oil applied is too large, and the amount of oil applied to the winding thread is 2.0.
Since the diameter was more than double, no fuzz was observed on the guides, but before the interlace nozzle, there was some oil scattering on the guides and take-up rollers while the yarn was running, and there was also dirt around the oil supply device. It was hot. Experiments No. 9 to 12 in Table 1 are experiments in which the amount of oil applied to the winding yarn was changed. In Experiment No. 9, the amount of oil applied to the winding yarn was less than 0.6% by weight, so when the obtained package was fed to a higher stage process, it fluffed heavily on the loom and the quality of the fabric was extremely low. In addition, in Experiment No. 12, the amount of oil attached to the winding yarn exceeded 1.5% by weight, so when the obtained package was supplied to a higher process, it was heavily soiled due to the oil falling off on the loom. When the fabric was fed to the scouring process, the scouring bath was heavily contaminated. On the other hand, Experiment Nos. 2, 3, and 5, which meet the requirements of the present invention,
Samples Nos. 6, 7, 10 and 11 had little fuzz and single yarn breakage during the spinning process, and even when a spinning property confirmation test was conducted, there were few spun yarn breakages, and extremely high operability was obtained. Furthermore, when the wound package was supplied to high-order processing, the passability was extremely good.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a preferred manufacturing apparatus used in the present invention. 1: Spinneret, 2: Spun yarn, 3: Oil application device, 4: First take-up roller, 5: Second take-up roller, 6: Shutoff plate, 7: Interlace nozzle,
8: Traverse fulcrum guide, 9: Winder.

Claims (1)

[Scope of Claims] 1. After the polyester polymer is melt-spun and the yarn is cooled and solidified, an oil agent is applied by an oil agent applying device, and then when the yarn is wound by a winding device via a take-up roller, the yarn is The amount of oil applied to the winding yarn (A) (% by weight relative to the weight of the yarn) is the amount of oil applied to the winding yarn (B) (% by weight relative to the weight of the yarn), and the applied amount satisfies the following formula. Then, use an air jet nozzle to remove some of the oil, and check the amount of oil adhered to the winding yarn.
A method for producing a polyester multifilament, characterized in that (B) is 0.6% by weight or more and 1.5% by weight or less. 1.2×B≦A≦2.0×B A≧1.0 2. The method for producing a polyester multifilament according to claim 1, characterized in that a nozzle that intertwines the yarn is used as an air jet nozzle.