JPS58203109A - Production of polyester multifilaments - Google Patents

Abstract

PURPOSE:A kind of shelter is provided between the second taking-up roller and the interlace nozzle and melt spinning of polyester polymer is effected to produce the titled multifilaments in high operability without formation of fluffs, white powders and filament breakages. CONSTITUTION:A polyester polymer is melt spun, and the filament yarn 2 from the spinneret 1 is treated with a finishing oil by means of an oiling device 3, then passing through the first taking-up roller 4 and the second taking-up roller 5 and interlaced by means of the nozzle 7. At this time, a shelter made of ceramic 6 is set between the second taking-up roller and the interlace nozzle so that the finishing oil mist does not contaminate the taking-up rollers and the air stream jetted from the interlace nozzle is changed in its direction. Then, the resultant yarn is wound up around the winder 9 at a speed of higher than 5,000m/min.

Description

[Detailed description of the invention] The present invention relates to an improved melt spinning process.

More specifically, while imparting stable entanglement in the melt-spinning and winding process of polyester polymers.

The present invention also relates to a method for manufacturing a yarn that can produce packages of uniform yarn quality with high operability without the occurrence of fuzz or single yarn breakage.

Conventionally, a melt-spinning winding method has been proposed in which an interlace nozzle is incorporated into the spinning process and compressed air is injected onto the yarn to entangle the yarn before winding it. However, as spinning speeds have increased in recent years, problems such as damage to yarns due to entanglement treatment in the spinning process and reduction in operability have become serious problems. That is, as the spinning speed increases, it becomes difficult to impart entanglement to the yarn.

Normally, it increases the pressure and flow rate of compressed air.

Measures are taken to lower the tension of the treated yarn, but this makes it easier for fuzz and white powder to occur at the interlace nozzle. Due to the increased amount of scattered air and oil mist, a phenomenon in which the yarn is likely to be wound around the take-up roller just before the interlacing nozzle (hereinafter referred to as the twitching phenomenon) may occur, and as a result, a single yarn or a complete yarn may be wound around the take-up roller. This makes it impossible to operate stably.

Moreover, this condition tends to become more severe as time passes.

On the other hand, when high-tension winding is performed with the aim of stabilizing the running yarn, the tightening force of the wound yarn increases, resulting in differences in yarn properties between the inner layer and outer layer of the package, and between the center and end portions of the package. occurs.

A problem arises in that a uniform winding yarn cannot be obtained.

In view of these problems, the present inventors have devised a spinning process that can produce uniform yarn without fuzz or white powder with stable operability without the need for single yarn wrapping or full yarn wrapping around a take-up roller. The present invention was arrived at as a result of intensive study on whether it is possible to do so.

In other words, in the present invention, a polyester polymer is melt-spun, and after the yarn is cooled and solidified, an oil agent is applied thereto, and then the yarn is interlaced with a take-up roller. A blocking plate is provided between the take-up roller and the gap immediately before the take-up roller to prevent oil from adhering to the take-up roller and to change the flow direction of the Q airflow from the interlaced nozzle. This is a method for producing polyester multifilament.

First, the present invention will be explained with reference to the drawings. FIG. 1 is a schematic diagram showing an example of a preferred manufacturing apparatus used in the present invention. 1 is a spinneret 2 is a polyester multifilament spun yarn.The spun yarn 2 is applied with a predetermined lubricant in an oil supply device 5, passes through a first take-up roller 4, a second take-up roller, and -5 to an interlace nozzle. Attach the predetermined confounding in step 7 4-
A shielding plate 6 is provided between the interlace nozzle 7 and the second take-up roller 5 to prevent the oil mist ejected from the interlace nozzle 7 from adhering to the second take-up roller 5 immediately before the interlace nozzle 7. By bending the compressed air flow ejected from the interlace nozzle 7 to the side opposite to the second take-up roller 5, the yarn is stably run and wound onto the winder 9 at a winding speed of 5000 m or more. . Note that 8 is a traverse fulcrum guide.

The most important thing in this invention is the interlaced nozzle 7)
A blocking plate 6 is provided between the second pulling roller 5 in front of the M and the second pulling roller 5. The present inventors have closely observed the running condition of yarn in the high-speed spinning process, and have found that the following two factors are the major factors that deteriorate the stability of running yarn and induce single yarn breakage and total yarn breakage. I found it.

■ By increasing the pressure of compressed air, interlaced nozzle 7
The oil mist blown off from the yarn adheres to the second take-up roller 5 immediately in front of the yarn, making it difficult for the yarn to separate from the second take-up roller 5, resulting in a twitching phenomenon.

■ At the point where the accompanying airflow generated around the second expansion roller 5 collides with the pressurized airflow ejected from the interlace nozzle 7, large airflow turbulence occurs, destabilizing the yarn under low tension.

Pycnoki phenomenon occurs.

The shield plate 6 is used to solve the above two problems, and is blown away by the interlace nozzle 7.
Also, prevent the oil mist from adhering to the second take-up roller. It is important to provide a roller between the second take-up roller and the interlace nozzle so as to change the flow direction of the air flow ejected from the interlace nozzle 7.
It is preferable to provide it near the pulling roller 5, particularly near the point where the second pulling roller 5 and the yarn separate.

FIG. 2 is a schematic diagram showing an enlarged view of the main part of the vessel for explaining the function of the shielding plate 6 shown in FIG. 1. That is, it is important to attach the blocking plate B so that the flow direction F1 of the pressurized air flow ejected from the interlaced nozzle 7 is bent in the direction F2 that does not interfere with the second take-up roller 5, as shown in FIG. As shown in FIG. 2, by changing the flow direction of this ejected pressurized air flow to a direction that does not interfere with the second take-up roller 5, the separation of the yarn is improved, and the second take-up roller 5
This makes it possible to prevent the occurrence of single thread wrapping or full thread wrapping.

In the present invention, it is preferable that the distance between the blocking plate and the interlaced nozzle is 70 mm or less because the effect of the blocking plate can be further exhibited.

The shape of the blocking plate may be any shape as long as it can prevent the oil mist from the interlaced nozzle from adhering to the take-up roller and bend the jet stream from the interlaced nozzle.

However, by providing a blocking plate between the take-up roller and the interlace nozzle, 0.1 to 0.4 g/
Since a stable running yarn can be obtained at a low tension such as c+, and it is possible to wind it at the low tension, a uniform yarn with no difference in yarn quality between the inner layer and outer layer, and between the end surface and the center of the package can be obtained. Although a package can be obtained, since the spinning speed is high and the yarns run in contact with each other in the interlace nozzle in a high-pressure empty state, migration between the yarns and friction between the interlace nozzle and the yarns become large, resulting in fuzz and white spots. ;
Problems arise, such as the occurrence of cracks or partial stretching of single filaments. The present inventors paid attention to this point, and as a result of conducting studies, by increasing the spinning speed to 5000 m/sin or more, no single yarn curl or fuzz occurred.

Ta. This is because when the spinning speed exceeds 5000 m/sin, the internal structure of the discharged yarn becomes extremely dense, and crystallization is promoted as the boiling water shrinkage rate becomes 10 or less.

This is thought to be due to the fact that the threads have greater toughness against abrasion with the outside. If the interlacing treatment is performed at less than 5000 m/sin, although entanglement is imparted, the interlaced portion becomes too fluffy during spinning and cannot be used as a spinning process.

Therefore, in the manufacturing method according to the present invention, the spinning speed is 5000.
The effect is exhibited and the purpose is achieved only when the spinning speed is 5000 m/si+ or more, especially 5500 LTI, as described above.
It is possible to create a process that does not cause fuzz or single yarn breakage.

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

It is preferable that the entire inner circumferential wall of the yarn passing portion of the interlaced nozzle used in the present invention is made of a ceramic member in order to more effectively prevent the generation of fuzz and white powder. High purity alumina, zirconium oxide, silicon carbide, silicon nitride, etc. can be used as the hepteramic member.

FIG. 3 is a schematic diagram showing an example of another preferred manufacturing apparatus used in the present invention. That is, as shown in FIG. 1, the blocking plate 6 and the interlace nozzle 7 are not limited to being installed near the second take-up roller 5 immediately in front of the winder 9, but as shown in FIG. It is also possible to install it near the first take-up roller 4.

The polyester polymer referred to in the present invention is primarily a polyethylene terephthalate homopolymer, but may also be a copolymer containing 85 or more moles of polyethylene terephthalate.

As detailed above, according to the present invention, not only can a good interlaced yarn without fuzz or white powder be obtained, but also a stable running yarn can be obtained even under low tension. This has the remarkable effect of improving operability.

Furthermore, since it is possible to reduce the winding tension, a good package can be obtained which has uniform yarn properties without any difference in yarn properties between the inner and outer layer parts, and between the end face parts and the center part of the package. Moreover, since the shielding plate can be manufactured and installed at low cost, it can produce remarkable effects with a small investment in equipment.

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

Example 1 [Tips of polyethylene terephthalate containing titanium oxide with ηJ=o64 were spun at a temperature of 290°C.

The discharge amount was set so that the denier of the wound yarn was 75 deniers, and a spinneret with 36 holes per spinneret was used.
Melt spinning was carried out using the apparatus shown in FIG. 1 under the conditions shown in the table, and the results shown in table 1 were obtained.

Incidentally, Experiment & 1.2.5.5 and 7 in Table 1 are comparative examples intended to clearly demonstrate the effects of the present invention.

Experimental coals 1 and 2 had a relatively low spinning speed of 4000 m/-(
This is an experiment in which the yarn was spun at 0, and the number of times the twitching phenomenon occurred and the number of spun yarn breakages was small regardless of whether a blocking plate was used or not.
Fuzz was generated on the surface and end surface 1 of the wound pancage, and the yarn could not be used for practical use.

Experimental points 3, 5, and 7 were conducted at ultra-high speeds of 5000 m/si1 or more, but they were conducted without using a blocking plate, and the number of occurrences of the birch tree phenomenon and the number of yarn breakages occurred frequently, and the operability was significantly reduced. It was low.

On the other hand, in Experiments A4°6 and 8, which satisfied the constituent requirements of the present invention, both the number of occurrences of the twitching phenomenon and the number of yarn breakages were small, and the operability was extremely good, and uniform packages with no difference in yarn quality were obtained.

Example 2 Chips of polyethylene terephthalate containing titanium oxide with ゛□ [η) = 0.64 were spun at a temperature of 290°C.

Discharge amount 50. Orr, / sin, number of spinneret holes 36 holes spinning speed (speed of take-up roller) 6000
m/sin.

Melt spinning was carried out using the apparatus shown in FIG. 1 under the conditions shown in Table 2, except that the air pressure was 6 aug, and the results shown in Table 2 were obtained.

Incidentally, Experimental Examples 9 to 13 in Table 2 are comparative examples for purposes of clarifying the present invention.

Experimental points 9 to 13 were conducted without using a blocking plate, and stable winding was not possible when the winding tension was less than 0.4 g/d. Some instability was observed even at 0.4 g/d. Under the winding tension that allows stable winding, non-uniformity occurred in the yarn quality of the package.

In an experiment using a shielding plate, which is a requirement of the present invention, 0.1
Stable winding was possible even at ~0.2 g/d, and extremely good operability was obtained, as well as a uniform yarn package.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a preferred manufacturing device used in the present invention, FIG. 2 is a schematic diagram showing an enlarged view of the main part of FIG. 1, and FIG. 6 is an example of another preferred manufacturing device used in the present invention. FIG. 1: Spinneret 2: Polyester multifilament spun yarn 6: Oil supply device 4: First take-up roller 5: Second take-up roller 6: Shutoff plate 7: Interlace nozzle 8: Traverse fulcrum guide 9: Winder Fig. 1 Figure 2 Figure 3

Claims (1)

[Claims] A polyester polymer is melt-spun, and after the yarn is cooled and solidified, an oil agent is applied thereto, and then passed through a take-up roller,
When interlacing the yarn and winding it, a blocking plate is provided between the interlace nozzle and the take-up roller immediately before it to prevent oil from adhering to the take-up roller and to change the flow direction of the airflow from the interlace nozzle. . Manufacturability of polyester multifilament characterized by winding at a winding speed of 5000 m/si+ or more.