JPS621002B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for melt spinning two or more types of filaments having different single yarn fineness from the same spinneret.

Conventional methods for obtaining mixed fiber yarns by spinning filaments with different finenesses from the same spinneret and winding them onto the same drum are disclosed in, for example, Japanese Patent Laid-Open No. 52-63417 and Japanese Patent Laid-Open No. 49-102916. has been disclosed. In these methods, two or more types of filaments having different single yarn finenesses are spun from the same spinneret, and the filaments are aligned and wound as they are. When obtaining mixed fiber yarn using such conventional methods,
The filament with the thickest single filament fineness among the mixed yarns,
If the ratio of single yarn fineness of the thinnest filament is about 3 times or less, it can be wound without any problem, but
It has been found that when attempting to obtain a mixed fiber yarn having a larger ratio of single yarn fineness, sagging occurs in the filament having a large single yarn fineness during winding, making it impossible to wind it stably.

When we investigated the cause of this, we found that when spinning filaments with a thick single yarn fineness and filaments with a fine single yarn fineness at the same time, the cooling of the thick single yarn filament is significantly delayed compared to the filament with a fine single yarn fineness. , the distance from the spinneret to the solidification point of the filament is much longer than that of a filament with a fine single filament. That is, the distance from the solidification point of the filament to the winding section (the point of contact of the yarn with the first godet roll) is shorter for filaments with thick single yarn fineness than those with fine single yarn fineness. Usually, the filament is in a molten state in the area from the spinneret to the solidification point of the filament, and the tension applied to the filament is substantially zero.

The tension of the filament during spinning is mainly determined by the air resistance applied to the filament from the solidification point to the take-off point, and the longer the distance from the solidification point to the take-off point, the greater the air resistance. Therefore, for the above-mentioned reason, the tension when the filament with a fine single filament is drawn is greater than the tension of the filament with a thick single filament, and therefore, the strain applied to the filament with a fine single filament is larger than that of the filament with a thick single filament. The fineness of the yarn is greater than the strain being applied to the filament. When actually winding the yarn onto the drum,
Drum form, second layer to avoid negative effects on yarn quality
Relax between codetroll and winder
It is wound with a tension of about 0.1 g/denier, but as mentioned above, the strain applied to the thick filament filament and the fine filament filament are different, so the amount of elastic recovery during relaxation is different for the thick filament. It has become clear that sagging occurs in fine filaments.

The present invention has been made based on this knowledge, and its purpose is to stably produce a mixed fiber yarn having a large ratio of single filament fineness between filaments with fine single filament fineness and filaments with thick single filament fineness. be.

That is, in the present invention, when two or more types of filaments with different single filament finenesses are simultaneously spun and taken from the same spinneret, the filaments are divided into a filament group with a fine single filament fineness and a filament group with a thick single filament fineness, and An oil agent is applied to the filament group of the yarn fineness at a position close to the spinneret, and an oil agent is applied to the filament group of the thick single yarn fineness at a position lower than the oil agent application position of the filament group of the thin yarn fineness, and then The method is characterized in that the filament group having the fine single yarn fineness and the filament group having the thick single yarn fineness are combined and taken off.

Next, the configuration and effects of the present invention will be explained using the drawings.

FIG. 1 is a front view of a process showing one embodiment of the present invention. In FIG. 1, a filament yarn discharged from a spinneret 1 is divided into a filament group 2 having a fine single filament fineness and a filament group 3 having a thick single filament fineness, and an oil agent is applied to the filament group having a fine single filament fineness. 4, an oil agent is applied to the filament group 3 of the thick single filament fineness, and after applying an oil agent to the filament group 3 of the thick single filament fineness, an oil agent is applied to the filament group 3 using an oil agent applying device 5, and the filaments are doubled.
This is an example in which the film is wound onto a winding drum 8 via winding roller 7. In this case, the oil applying device 5 needs to be installed below the oil applying device 4.

Applying oil to the filament group with fine single filament fineness is carried out on the upper floor near right below the cooling air blowing device (10 in Fig. 1 indicates the upper floor), and then to the filament group with thick single filament fineness. Applying the oil to the upper part of the take-up machine downstairs (11 in Figure 1 indicates the floor below), which has been generally done in the past, provides good threading operability and makes it easy to modify the equipment. Therefore, it is preferable. In a device that applies lubricant to a group of filaments with a fine single yarn fineness, the group of filaments with a thick single yarn fineness runs near the oiling position, so the oil supply part needs to be compact, and from this point of view, it is necessary to make the oil supply part compact. It is preferable to employ a metering oiling device (also called a guide oiling device) that can apply the oil to the yarn using an oiling nozzle. The device for applying lubricant to the group of thick filament filaments downstairs can be freely adopted, such as a conventional oiling roller device or a metered lubrication device.

With this configuration, the filament group 2 with fine single yarn fineness runs between the oil agent applying device 4 and the first godet roll 6 in a bundled state, while the filament group 3 with thick single yarn fineness runs between the oil agent applying device 5 and the first godet roll 6. Although the group of filaments with fine single yarn fineness travels in a bundled state between the first godet rolls 6, the distance traveled in a bundled state is longer for the filament group with fine single yarn fineness than the group of filaments with thick single yarn fineness. Therefore, the increase in spinning tension due to air resistance during this period is smaller for filaments with fine single yarn fineness than for filaments with thick single yarn fineness. As a result, the difference in the amount of strain applied to the filament with a thick single yarn fineness and the filament with a fine single yarn fineness during winding is reduced, and it is possible to prevent the occurrence of sagging in the filament with a thick single yarn fineness during winding.

FIG. 2 shows another embodiment of the present invention, in which a lubricant is applied to a group of filaments with a fine single yarn fineness by an oil applying device 4 to bundle the yarns, and then an oil is applied to a group of filaments with a thick single yarn fineness. When the oil agent is applied by the device 9, the group of bundled filaments with fine single yarn fineness is again applied with the oil agent at the same time as the group of filaments with thick single yarn fineness. In this method as well, the filament group having a fine single yarn fineness can be prevented from increasing tension due to air resistance between the lubricant applicators 4 and 9, and can be wound stably as in the case of FIG. 1.

In the present invention, the single fiber fineness of the filaments spun from the same spinneret is not particularly limited as long as it is two or more types, but in consideration of operability in actual production, it is preferably 2 to 4 types. Further, the cross-sectional shape of the filament may be a round cross-section, a modified cross-section, or a filament with a mixed cross-section of a round cross-section and a modified cross-section.

The method of dividing two or more types of filaments with different single yarn finenesses spun from the same spinneret into a filament group with fine single yarn fineness and a filament group with thick single yarn fineness is to You can simply divide the filaments into a filament group with yarn fineness and a filament group with fine single filament fineness, but if there are three or more types of filament fineness, divide them into two filament groups and select the filament group with the highest single filament fineness within each filament group. It is preferable that the single filament fineness ratio between the thick filament and the thinnest filament is 3 times or less, and all filaments included in the filament group with fine single filament must be completely cooled and solidified at the oiling position. Needless to say.

The spinneret used when carrying out the present invention is
As shown in a, b, and c of FIG. 3, a filament in which discharge holes are arranged in blocks for each single yarn fineness is preferably used so that the filament can be easily divided. In FIG. 3, A, B, and C are discharge hole groups for fine single yarn fineness, medium fineness fineness, and fine single yarn thick single yarn, respectively, and the arrow in the figure is the discharge direction of the cooling air. Furthermore, it is convenient to arrange the discharge hole groups in the order of the fineness of the single filament to facilitate division.

The present invention is applicable to melt spinning of thermoplastic polymers such as polyester and polyamide, and the spinning speed is 2,000 yen, where air resistance during spinning becomes a major problem.
It is particularly effective for high-speed spinning exceeding m/min.

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

Example 1 A polyethylene terephthalate chip with an intrinsic viscosity of 0.63 measured at 25°C in an orthochlorophenol solvent was spun at a temperature of 290°C into 15 discharge holes for fine single filament filaments and one thick single filament filament. A group of fine single filament filaments with a single filament fineness of 6 denier is discharged at a discharge rate of 45 g/min from a nozzle with a discharge hole, and is lubricated with a metering lubrication device on the floor directly below the cooling device, 1.5 m below the nozzle. On the other hand, the single yarn fineness is 45
Denier thick single yarn fineness filament group is 6 below the cap.
After lubricating the yarn using a conventional oiling roller method downstairs, the two yarns were wound together at a winding speed of 3000 m/min and a winding tension of 0.12 g/denier to obtain an undrawn yarn of 135 denier. As a result of observing the winding conditions, no sagging occurred in the thick single yarn fineness filament, the shape of the wound drum was good, and there were no problems with the yarn quality.

Comparative Example 1 When spinning was carried out under the same conditions as in Example 1 except that a group of filaments with a fine single yarn fineness were oiled with an oiling roller at a position 6 m below the spinneret together with a group of filaments with a thick single yarn fineness, thick single yarns were obtained. Significant sagging occurred in the fineness filament, and this caused frequent thread winding and thread breakage on the second cordet roll, making it impossible to stably wind the thread.

[Brief explanation of the drawing]

FIG. 1 is a front view of a process showing one embodiment of the present invention, and FIG. 2 is a front view of a process showing another embodiment of the present invention. FIG. 3 is a hole arrangement diagram of a cap suitable for carrying out the present invention. 1: Spinneret, 2: Fine single yarn fineness filament group, 3: Thick single yarn fineness filament group, 4, 5,
9: Oil application device, 6: First godet roll,
7: Second godet roll, 8: Winding drum.

Claims (1)

[Claims] 1. When simultaneously spinning and taking off two or more types of filaments with different single fiber finenesses from the same spinneret,
The filaments are divided into a group of fine single filament fineness and a filament group of thick single filament fineness, and an oil agent is applied to the filament group of fine single filament fineness at a position close to the spinneret, and to the filament group of thick single filament fineness. After applying an oil agent below the oil agent application position of the filament group of the fine single yarn fineness, the filament group of the fine single yarn fineness and the filament group of the thick single yarn fineness are combined and taken off. Melt spinning method. 2. The melt spinning method according to claim 1, wherein the application of oil to the filament group having a fine single filament fineness is carried out by a metered oil supply method.