JPS58203110A - Production of polyester multifilaments - Google Patents

Abstract

PURPOSE:The amount of the finishing oil applied to the yarn after melt spun is set to a specific ratio to the amount of the finishing oil remaining on the wound-up yarn and a part of the finishing oil is removed by means of an air- jetting nozzle, resulting in oiling in a prescribed amount, to produce the titled yarn without fluffing and filament breaking. CONSTITUTION:A polyester polymer is melt spun through the spinneret 1 and the yarn is solidified by cooling, then treated with a specific amount of the finishing oil. At this time, the amount A (in wt% based on the yarn weight) of the finishing oil applied to the yarn 2 at the applicator 3 is set so that A and B (the amount of the oil contained in the wound-up yarn) satisfy the formulas: 1.2XB<=A<=2.0<=B, and A>=1.0. Further, the yarn is passed on the guides 10, 11, then around the first taking-up roller 4 and a part of the oil is removed with an air-jet nozzle 7 between the winder 9 and the second taking-up roller 5 right before the winder to set B to 0.4-1.5wt% based on the yarn weight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for making polyester multifilaments. More specifically, it relates to a method for producing polyester multifilament that can provide the desired oil to the wound yarn even at high spinning speeds in the melt spinning process of polyester polymers, and that can achieve high operability without fuzz or single fiber breakage. be.

Conventionally, polyester fibers have been treated with oil agents according to their high-level processing applications. 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 attached to the yarn is too small, fluff and white powder will occur frequently on the false-twisting spindle, and if the amount attached is too large, problems such as tar formation and dirt will increase on the false-twisting hot plate. Therefore, it is important that the oil agent suitable for the high-level application is applied uniformly and in the desired amount.

In general, a predetermined amount of oil is applied to the yarn during the spinning process and the yarn is wound up. However, in recent years, the spinning speed has been increasing more and more, and as the spinning speed has increased, it has become difficult to give the yarn a coating amount that suits the purpose and to wind it. That is, as the spinning speed increases, fluctuations in the spinning tension increase, making it difficult to uniformly adhere the oil agent.

Furthermore, as the spinning speed increases, new problems have arisen, such as the generation of fuzz, white powder, and single yarn breakage because the threads are rubbed against the guides at a high speed.

The present inventors have taken this problem into consideration.

- 111'', the target lubricant can be applied to the wound yarn, and the present invention Q has been achieved as a result of intensive study on whether it is possible to provide a spinning method that does not cause fuzz or single yarn breakage.

That is, the present invention melt-spun a polyester polymer,
After the yarn is cooled and solidified, an oil agent is applied to the yarn using an oil agent applying device, and then when the yarn is wound up by a winding device via a take-up roller, the amount of oil agent applied to the yarn (A) (% by weight relative to the weight of the yarn) is The amount of oil applied to the winding system (B) satisfies the following equations (1) and (2) at the same time, and before the winding device, a part of the oil is removed using an e-air jet nozzle, and the winding is adjusted to the amount (B) of oil applied to the thread. This is a method for producing a polyester multifilament, characterized in that B) is 0.4% by weight or more and 1.5% by weight or less based on the yarn weight.

■ 1.2XB≦A≦2. QXB ■　A≧1,0 Next, the constituent elements of the present invention will be explained in detail.

The polyester polymer used in the present invention is mainly a polyethylene terephthalate homopolymer, but it may also be a copolymer containing 85 mol% or more of polyethylene terephthalate.

The most important thing in the present invention is that when applying the yarn thread lubricant with the lubricant applying device, once the lubricant is applied in an amount of 1.2 to 2.0 times the target lubricant adhesion amount t on the winding yarn, Moreover, before winding, a portion of the oil is removed using an air jet nozzle to control the amount of oil that adheres to the wound yarn.

The present inventors conducted various studies on what kind of arrangement is most important in order to achieve a process in which fuzz and single fiber breakage do not occur during high-speed spinning. As a result, the amount of oil applied (
There is a big point, 1.0 weight φ compared to the yarn weight.
With the above and the target amount of oil adhering to the winding yarn t, 1
．． It has been found that it is possible to achieve a process in which fluff and single yarn breakage do not occur only by applying an oil agent in an amount in the range of 2 to 2.0 times. The amount of oil applied is less than 1.0% by weight based on the weight of the yarn.

In addition, if the amount of oil applied to the winding yarn is less than 162 times the target amount, the absolute amount of oil is small. If the top is run in contact at high speed, fuzz and single thread breakage will occur. Moreover, if the amount of oil applied is less than 1%, the spinning tension becomes high and the spinning tension fluctuation becomes large, which is not preferable. Also, if the amount of oil applied exceeds 20 times the target amount of oil applied to the winding yarn, the entire amount of applied oil may not be attached to the yarn. - There is a lot of oil scattering at the
Unfavorable in terms of environmental hygiene.

As mentioned above, it is possible to prevent the occurrence of fuzz and single yarn breakage by applying an oil agent that is 1.2 to 2.0 times the target amount of oil applied to the winding yarn ``t''. but,
If the yarn with the oil adhering to it is wound up in a pan cage as it is, and the package is supplied to a higher-order process, there is a problem that a large amount of oil will fall off in the higher-order process, contaminating the warping machine or loom. A point occurs. The inventors of the present invention have carried out various studies aimed at preventing this drawback, and as a result, we have found that we protect the yarn with a large amount of oil until it passes through guides where fuzz is likely to occur, and then apply oil after passing through the guide portion. It has been found that reducing the amount to a predetermined amount is effective. We have found a way to effectively control the amount of oil adhered to the target by removing part of the oil using an air jet nozzle before the winding device.

In order to remove a portion of the oil using a compressed air flow using an air jet nozzle and control the amount of oil adhered to the target amount, t is appropriately set in consideration of the air pressure of the air jet nozzle, the thread tension during running, and the like. 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 thread tension, the greater the freedom of vibration of the thread running inside the air jet nozzle. Since it is thick, it is possible to remove a large amount of oil. It is important that the amount of oil applied to the wound yarn thus controlled is 0.4% by weight or more and 1.5% by weight or less based on the weight of the yarn, and is 0.6.1'.

It is preferable that the weight percent increase is 1.2 weight molecules or less. If the amount of oil attached is less than 0.4% by weight, when the wound yarn is fed to a higher process, it will become fluffy on the warper, or when it is passed on the loom, the coefficient of friction between the yarn and the yarn and the yarn and the metal will be high. , problems such as thread breakage occur. In addition, if it exceeds 1.5% by weight, the oil agent will fall off on the warping machine, loom, scouring, and dyeing bath, and contamination in each higher process will increase, so 1.5% by weight
Below (need to be rubbed.

The oil agent used in the present invention is preferably an aqueous emulsion oil agent with a concentration of 5% by weight or more and 15% by weight or less, and 5% by weight or more and 12% by weight or less, in order to achieve uniform adhesion and focusing properties.
It must be an aqueous emulsion oil with a weight of less than φ.
This is preferable.

If the oil concentration is less than 3% by weight, the water content is too high, which is not preferable because water evaporates at the end face of the pan cage to a large extent, and thread unevenness corresponding to the end face of the package is likely to occur in subsequent processes (stretching process, etc.). Furthermore, if the concentration of the oil agent exceeds 155% by weight, the uniform adhesion of the oil agent tends to decrease, which is not preferable.

The sliding lubricant applicator used in the present invention may be of any type as long as it can apply a predetermined lubricant, such as an oiling roller one-way type or a guide lubricant type, but a metering guide lubricant type is preferred because it allows uniform lubricant application.

It is preferable that the entire inner circumferential wall of the yarn passage section of the air jet nozzle used in the present invention is made of a ceramic member, since fuzz and single yarn breakage can be more effectively prevented. High-purity alumina, zirconium oxide, silicon carbon, silicon nitride, etc. can be used as the ceramic member. In the present invention, when the spinning speed is 5000 m/min or more, it is easy to control the amount of oil applied to the wound yarn.
In addition, the spinning speed is preferably 5000 m/min or more, as fuzz and single yarn breakage tend to occur and make the spinning process difficult.
More preferably, the speed is 5500 m/min or more.

In the present invention, it is essential to remove a portion of the oil using an air jet nozzle, and if the removed oil scatters and adheres to the take-up roller immediately before, the stability of yarn running will decrease, and the thread will not reach the take-up roller. Since the thread winds backwards and is likely to break, either store the air jet nozzle in a box or install a shield plate between the air jet nozzle and the take-up roller to prevent oil particles scattered on the take-up roller from adhering. or a combination of both is preferred. Further, it is preferable that the distance between the blocking plate and the air jet nozzle is 70 crn or less in order to further improve the effect of the blocking plate. Further, it is preferable to install the blocking plate near the take-up roller so that the flow of compressed air from the air jet nozzle is bent to the opposite side of the take-up roller.

In the present invention, as an air jet nozzle, yarn number
It is preferable to use an interlace nozzle that can provide this interlacing. If the winding yarn is entangled, the unwinding property of the yarn from the package will be improved, as well as the ability to pass through higher-order processes. Therefore, an interlaced nozzle is used as an air jet nozzle to remove part of the oil agent. It is preferable to add yarn entanglement to the yarn.

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 agent 2 is cooled and solidified, an oil agent 1.2 to 20 times the target amount of oil agent attached to the wound yarn is applied by an oil agent applying device 3, and then the spinning yarn agent 2 is applied with an oil agent in an amount of 1.2 to 20 times the target amount of oil agent attached to the winding yarn. A portion of the lubricant is removed by using an interlace nozzle 7 as an air jet nozzle between the winder 9 and the second take-up roller 5 immediately before it via the roller 4, and the target amount of lubricant attached to the wound yarn is controlled. , is wound up by a winder 9 via a traversing fulcrum guide 8.

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, a blocking plate 6 is installed between the second take-up roller 5 and the interlace nozzle 7 as shown in FIG. It is a good idea to provide

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. This invention has the remarkable effect of providing a winding yarn with a good amount of coating.Furthermore, the present invention makes it possible to effectively control the amount of oil coating on the winding yarn, making it possible to supply a large amount of oil. Therefore, the yarn can be highly focused.Therefore, the spinning tension can be lowered, and the spinning tension fluctuation can also be reduced.

The present invention will be explained in more detail with reference to Example t below.

Example 1 [η] = 0.64 polyethylene terephthalate chips containing titanium oxide were spun at a temperature of 290°C.

The discharge amount was set so that the denier of the wound yarn was 75 denier, and melt spinning was carried out using the apparatus shown in Figure 1 under the conditions shown in Table 1, including the number of spinner holes: 36, the oil concentration: 8 weight, and the like. The results shown in Table 1 were obtained.

)1 Experiments A'516.10.11 and 14 in Table 1 are comparative examples for clarifying the present invention.

In Table 1, experiments were carried out in Experimental Planes 1 to 5 by changing the spinning speed and the amount of oil applied. In Experiment & 3, 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 attached to the guides L and the interlace nozzle, making it difficult to wind up. Many fluffy ends were also observed on the surface and edges of the package.

Experiment A1.2, in which the fΔ spinning speed was relatively low, produced some fuzz.

Experiments 6 to 10 in Table 1 are experiments in which the amount of oil applied was changed and the magnification relative to the amount t of oil applied to the winding was changed. In Experimental Washing 6, the amount of oil applied was less than 1 weight percent and was less than 1.2 times the amount of oil applied on the winding, so fluff was attached to the guides and the surface and end surfaces of the wound package were coated with fluff. There was a lot of fluff.

In addition, for experimental flatten 10, the amount of oil applied was too large, exceeding 2.0 times the amount of oil applied to the winding yarn, so no fluff was observed on the guides. There was some oil scattering on the take-up roller, and there was some dirt around the oil supply device.

Experiments Nos. 11 to 14 in Table 1 are experiments in which the amount of oil applied to the winding yarn was changed. In Experiment 11, the amount of oil applied to the winding yarn was 0.4.
Since the weight was less than the weight limit, when the obtained package was supplied to a higher-order process, the fabric was extremely fluffy on the loom and the quality of the fabric was extremely low. In addition, since the amount of oil applied to the winding yarn exceeded 1.5 weight percent, experimenter 14 supplied the resulting package to a higher process, and found that it was heavily contaminated due to the oil falling off on the loom. When the obtained fabric was fed to a scouring process, the scouring bath was heavily contaminated.

On the other hand, experiments that meet the requirements of the present invention/161.2.4.5.7
．． 8.9.12 and 13 had less fluff and single yarn breakage during the spinning process, and even when a spinning property confirmation test was conducted, there were fewer breaks in the spinning system, and extremely high workability was obtained. Furthermore, when the wound package was supplied to high-order processing, the passability was extremely good.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a preferred manufacturing apparatus used in the present invention. 1: Spinneret 2: Spun yarn 5: 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 patent applicant Toshi Co., Ltd. Company diagram 1

Claims (2)

[Claims] (1) After the polyester polymer is melt-spun and the yarn is cooled and solidified, an oil agent is applied to the yarn using an oil agent applying device, and then the amount of oil agent applied to the yarn is taken up by a winding device via a take-up roller. (A) (wt% relative to the yarn weight) is applied to the amount of oil applied to the winding system (B) that satisfies the following equations (1) and (2) at the same time. A method for producing a polyester multifilament, characterized in that the amount of oil applied to the winding system (B) is 0.4 to 1.5 weight relative to the yarn weight. ■ 1.2XB≦A≦2. OXB ■ A≧1.0 (2) A method for producing polyester fiber/tiff filament according to claim (1), characterized in that a nozzle that entangles the yarns is used as an air jet nozzle.