JPS61215734A - Production of blended fiber yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for producing a mixed yarn using an entangling treatment fluid nozzle (hereinafter simply referred to as an entangled nozzle), and in particular, relates to a method for producing a mixed yarn using an entangling treatment fluid nozzle (hereinafter simply referred to as an entangled nozzle). The present invention relates to a method for producing a mixed fiber yarn in which multifilament yarns are unified by an interlacing nozzle when they are stretched and then relaxed.

[Prior art]

BACKGROUND ART A method for producing a mixed fiber yarn is known in which a plurality of multifilament yarns are passed through an interlacing nozzle and integrated. This method involves aligning multiple multifilament yarns so that the fibers of the multiple multifilament yarns are sufficiently mixed and entangled, and the resulting mixed yarn exhibits good knitting and weaving properties. This is a method of passing the material through an entangling nozzle under overfeed, that is, under a relaxed state.

According to this method, the fibers of multiple multifilament yarns are well mixed randomly in the length direction, and the multiple multifilament yarns are easily separated by the convergent entanglement portions that are generated and distributed in the length direction. It is possible to obtain a blended yarn without any problems. However, on the other hand, this method has a problem in that loops are likely to occur between the bundled and entangled portions, which impairs the appearance of the mixed yarn and reduces the weaving and weaving properties. This problem is largely related to overfeed when passing through the interlacing nozzle. That is, this problem can be solved by eliminating overfeed and passing the material through the entangling nozzle under tension. However, in this case, it is not possible to sufficiently intermix the fibers of the plurality of multifilament yarns with each other and to generate a converging and entangling portion where the fibers are sufficiently integrated. Moreover, this problem becomes more pronounced when a plurality of multifilament yarns have different elongation elastic recovery rates. That is, since multiple multifilament yarns are tensioned and aligned in advance, and then overfeed and passed through an interlacing nozzle, if there is a difference in elongation elastic recovery rate among multiple multifilament yarns, overfeeding occurs. This is because when the yarn has a high elongation elastic recovery rate, its large elastic contraction causes the yarn with a low elongation elastic recovery rate to become slack, and this slack contributes to the generation of loops in the mixed fiber yarn. In particular, after drawing an undrawn yarn, multiple multifilament yarns with different elongation elastic recovery rates are formed by a yarn passed through a drawing set heater and a yarn passed through after removing the drawing set heater, and they are aligned. If the mixed yarn is continuously overfed and passed through the interlacing nozzle, the slack caused by the difference in elastic contraction will further increase, making it more likely that loops will form in the mixed yarn.

Creates a convergence entanglement for multiple multifilament yarns with different elongation elastic recovery rates and integration.
Moreover, the conventional method for preventing loops from occurring in mixed yarns is to increase the fluid pressure and flow rate of the entangling nozzle, thereby creating densely convergent entangled parts, thereby eliminating the loops that occur. It was a way to make it more detailed. With this method, it is difficult to fundamentally eliminate the occurrence of loops, and the convergent interlacing portions occur too densely, which tends to impair the texture, luster, appearance, etc. of the resulting interwoven yarn. , a large amount of compressed fluid is used, which increases the manufacturing cost of the mixed yarn.

[Purpose of the invention]

The present invention was made to solve the above-mentioned problems, and it is possible to use an interlacing nozzle to collect multiple multifilament yarns with different elongation elastic recovery rates without using a method of increasing the fluid pressure and flow rate of the interlacing nozzle. To provide a method for producing a mixed fiber yarn that is sufficiently mixed and integrated without forming loops.

[Structure of the invention]

In the present invention, a plurality of multifilament yarns with different elongation elastic recovery rates are stretched together by a stretching roller, then passed through an entangling fluid nozzle, and pulled from the nozzle by a take-off roller having a surface speed lower than that of the stretching roller. A method for producing a mixed fiber yarn in which at least the elongating roller is a roller that sends the multifilament yarn wound thereon by frictional force, and the plurality of multifilament yarns are separated on the elongating roller. It is wound in a state that
According to the method for producing a mixed fiber yarn, characterized in that the multifilament yarn is fed by the stretching roller at an overfeed of 0.5 to 5.0% with respect to the take-up speed of the take-up roller, and with this configuration. The above objectives have been achieved.

That is, in the present invention, when a plurality of multifilament yarns having different elongation elastic recovery rates are wound around an elongation roller and fed into an interlacing nozzle by overfeeding by the frictional force of the elongation roller, When the filament yarns are wound around a stretching roller in close contact with each other, the elastic contraction of the yarn with a high elongation elastic recovery rate caused by overfeed causes the yarn with a small elongation elastic recovery rate to become slack. As a result, loops tend to occur in mixed yarns, but when multiple multifilament yarns are separated and wound around a stretching roller, both yarns with high and low stretching elastic recovery rates will elastically contract independently. As a result, it was discovered that the yarn with a low elastic recovery rate does not loosen when suspended by a yarn with a high elastic recovery rate, and as a result, loops do not occur in the mixed yarn. It has been done. The reason why we used a roller that feeds the stretching roller using frictional force due to winding is because the elastic contraction of the multifilament yarn also occurs on the stretching roller, further eliminating the occurrence of slack. When gripping rollers are used, elastic contraction of the multifilament yarn occurs only after it comes out of the stretching roller, so slack is less likely to occur, and therefore loops are more likely to occur in the mixed yarn. In contrast to the stretching/lengthening roller, the take-up roller that takes the mixed yarn from the interlacing nozzle may be the same roller as the stretching roller or a pair of pinching and gripping rollers.

In addition, in the present invention, the feeding speed, that is, the surface speed of the elongating roller is set to an overfeed of 0.5 to 5.0% with respect to the take-up speed, that is, the surface speed of the take-up p roller. If it is less than 5%, elastic contraction will hardly occur and no loops will be formed.However, unless the fluid pressure and flow rate of the entangling nozzle are increased, sufficient crosstalk and converging entangled parts for integration will not be obtained. If the overfeed exceeds 5.0%, fuzz will appear in the mixed yarn, the yarn will easily get caught in the interlacing nozzle, causing process instability, and quality and operability will deteriorate. If the overfeed is 0.5 to 5.0%, multiple multifilament yarns with different elongation elastic recovery rates will each elastically contract before passing through the interlacing nozzle. Even without particularly increasing the fluid pressure or flow rate of the entangling nozzle, the entangling nozzle can sufficiently mix the fibers and integrate the fibers by the focusing and entangling portion.

〔Example〕

The present invention will be explained below using illustrated examples.

Fig. 1 is a side view showing an example of an apparatus for carrying out the method of the present invention, Fig. 2 is a partial perspective view showing a state in which the method of the present invention is carried out, and Fig. 3 is a side view showing an example of an apparatus carrying out the method of the present invention. FIG.

The apparatus of FIG. 1 each has an undrawn yarn package 1.1'
The undrawn yarns Y and Y' are pulled out through guides 2 and 2' by a pull-out roller 3 consisting of a pair of pinch rollers 3a and 3b, and then passed through a separation guide 4 and then passed through a preheating roller 5.
The yarn is fed into a drawing zone by a drawing feed roller yarn 5 consisting of a wire a and a bin 5b, where one yarn comes into contact with a draw set heater 6, and the other yarn is separated from the draw set heater 6 by a separating guide 7. By passing through the different paths, a difference in elongation elastic recovery is imparted to both yarns, and both yarns are stretched by a stretching roller system 8 consisting of a roller 8a and a bin 9, and upon exiting from the stretching roller system 8, an entangling nozzle 10 The mixed yarn is taken up from the interlacing nozzle 10 by a roller yarn 11 consisting of a small-diameter roller lla integrated with a roller 8a and a bin 9, and then
When it comes out of the roller system 11, it passes through a guide 12 and is wound around a winder 13 by a ring winder.

In this apparatus, the method of the present invention takes the diameter of the roller 8a of the elongating roller system 8 and reduces the diameter of the small diameter roller ll of the roller system 11.
0.5 to 5.0% larger than the diameter of a, and the yarn that was in contact with the stretching set heater 6 and the yarn that was not in contact with the stretching roller yarn 8 are separated as shown in FIG. This is done by winding the wire around the wire. If a plurality of multifilament yarns with different elongation elastic recovery rates are separately wound around the stretching roller system 8 in this way, each multifilament yarn will elastically contract independently when overfed by the stretching roller system 8. As a result, the yarn with a low elongation elastic recovery rate is not loosened due to the elastic contraction of the yarn with a high elongation elastic recovery rate, and loops are generated in the mixed fiber yarn exiting the interlacing nozzle 10. There will be no more. On the contrary,
As has been conventionally known, when the yarn that has been brought into contact with the stretching set heater 6 and the yarn that has just been brought into contact with it are wound in close alignment around the stretching roller system 8 as shown in FIG. When the yarn with a high elongation elastic recovery rate elastically contracts on the side overfed by the roller
A loop is formed in the mixed fiber yarn exiting the interlacing nozzle 10.

The present invention will be specifically explained by showing the results of manufacturing a mixed yarn using the apparatus shown in FIG. 1 under the conditions described above.

As undrawn yarn packages 1 and 1', undrawn yarn (undrawn yarn for obtaining a 30 denier/24 filament polyester filament yarn) prepared by spinning polyethylene terephthalate at a spinning speed of 1300 m for 7 minutes, and a package were used. Preheating roller 5a of stretch feed roller system 5
The surface temperature of the stretching set heater 60 is 200° C., the stretching ratio between the stretching feed roller system 5 and the stretching roller system 8 is 3.0, and the air pressure used for the entangling nozzle 10 is 1.5 KP. /CllI2, the take-up multi-speed of the take-up roller system 11, that is, the take-up multi-speed of the mixed yarn to the bopi 713, was set to 1000 m/min, and the overfeed rate of the elongated roller yarn 8 to the take-up roller system 11 was variously changed. In addition, the winding conditions around the elongating roller system 8 were changed as shown in FIGS. 2 and 3, and the results of mixed fiber yarns obtained under each condition are shown in Table 1.

In Table 1, the loop rate is determined by visually inspecting 2,000 2.5KF winding pirns of the mixed yarn obtained under each condition, and when the length of the loop forming is 1O■ or more, 3 - Loops overhanging to a height of 1 on the surface
Pern with 0 or more loops is defined as a par 7 with loops, and the ratio is shown.The fuzz rate is determined by observing the occurrence of fuzz due to filament breakage at the same time. This figure shows the ratio of fluffy paan to fluffy paan. In addition, the unentangled yarn length difference indicates the average size of filament slack that does not result in the above-mentioned loops, which exists between the convergent entangled portions of the mixed yarn, qualitatively determined from the appearance of the pirn. , IL degree variation indicates the average variation in the convergence and entanglement portion distribution in the mixed yarn, which is also qualitatively determined from the appearance of the pirn.

As is clear from the results in Table 1, the overfeed rate by the stretching roller system 8 was set to 0.5 to 4.75%, and the winding state around the stretching roller system 8 was as shown in Figure 2. According to the method of the invention, the occurrence of loops is extremely small, and the filament slack in the unentangled portion is also extremely small.
An excellent mixed fiber yarn with small variation in the distribution of the converging and intertwined portions can be obtained, but when the overfeed rate is set to 5.50%, fluff occurs more often, and when the overfeed rate is set to 0.5~ 4. Even if the ratio is 75%, if the winding state around the elongating roller system 8 is as shown in FIG. The variation in the distribution of is also relatively large.

Although not shown in Table 1, when the overfeed rate of the stretching roller system 8 is set to 0, it is possible to obtain a mixed fiber yarn in which the mixed fibers and the convergence and entanglement portion are satisfactorily integrated. There wasn't.

〔Effect of the invention〕

As described above, according to the method of the present invention, a plurality of multifilament yarns with different elongation elastic recovery rates can be intertwined using an intertwining nozzle without increasing the fluid pressure or flow rate and without creating loops or fuzz. An excellent effect can be obtained in that the fibers can be sufficiently mixed and integrated by the converging and entangling portion.

Note that the present invention is applicable not only to a blend of polyester filament yarns but also to a blend of different types of filament yarns, and is not limited to the types of multifilament yarns having different elongation elastic recovery rates.

Furthermore, as shown in the examples, the present invention has a particularly remarkable effect when the undrawn yarns are mixed continuously, but the present invention is not limited thereto. It can also be applied to mixed fibers.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of an apparatus for carrying out the method of the present invention, Fig. 2 is a partial perspective view showing a state in which the method of the present invention is carried out, and Fig. 3 is a side view showing an example of an apparatus carrying out the method of the present invention. FIG. 1.1'...undrawn yarn package Y, Y'...undrawn yarn, 2,2'...guide, 3...pull-out roller, 4...separation guide, 5... i Stretching feed roller system, 6... Stretching set heater, 7... Peeling guide, 8... Stretching roller system,
10... Entwining nozzle, 11... Taking-off roller system, 1
2...Guide, 13...Bobbin.

Claims (3)

[Claims] (1) A plurality of multifilament yarns with different elongation elastic recovery rates are stretched together by a stretching roller, then passed through an entangling treatment fluid nozzle, and taken off from the nozzle by a take-off roller whose surface speed is slower than that of the stretching roller. A method for producing a mixed fiber yarn, wherein at least the stretching roller is a roller that sends the multifilament yarn wound thereon by frictional force, and the plurality of multifilament yarns are separated on the stretching roller. A method for producing a mixed fiber yarn, characterized in that the multifilament yarn is wound in a state in which the multifilament yarn is fed by the elongating roller at an overfeed of 0.5 to 5.0% with respect to the take-up speed of the take-up roller. . (2) The plurality of multifilament yarns having different elongation elastic recovery rates are yarns that are undrawn yarns that are passed through a draw set heater after being drawn, and yarns that are passed through a draw set heater after being drawn. Method for manufacturing mixed fiber yarn. (3) The method for producing a mixed fiber yarn according to claim 1, wherein the take-up roller is a roller that is coaxially integrated with the elongating roller and feeds an entangling treatment system that is also wound by frictional force.