JPS5830426B2 - Method for manufacturing spun yarn style yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing yarn-like yarns containing continuous multifilament yarns as constituent units.

As a method for producing spun yarn-like yarn, the present applicant has developed a method for producing a yarn that resembles a spun yarn by winding a substantially untwisted continuous multifilament yarn around the surface of a rotating conical or cone-shaped spindle while opening it, and depositing it in a continuous manner. For this reason, we have previously applied for a method of drawing in the direction of the rotational axis of the spindle at a speed slower than the surface speed of the spindle.

In the following, a conical or cylindrical spindle will be referred to simply as a spindle.

This method includes a method in which the opened filament is wound around the spindle surface and then pulled out in front of the spindle;
There are various variations, such as a method in which the filament is turned over at the tip and pulled out through the hollow hole of the spindle, a method in which a core yarn is supplied, covered and combined with this, and a method in which a part of the opened filament is released into the space in front of the spindle. Both of these methods use continuous multifilament yarn as the main material, which is bundled and entangled with a large number of twists to effectively obtain a spun yarn-like yarn. It is essential that the fibers be opened uniformly and stably.

Conventionally, the method for opening continuous multifilament yarns is as follows:
Methods that use electricity, methods that use fluid, etc. are widely known, and both can be used in the above-mentioned method for producing spun yarn-like yarn, but each has drawbacks.

That is, electrical fiber opening method (for example, Japanese Patent Publication No. 47-11
248), if the tension of the continuous multifilament yarn becomes too high, the opening performance will decrease, so it is necessary to balance the yarn feeding speed to the opening zone and the take-up speed, that is, the winding speed to the side of the spindle. Because it was necessary to maintain a low tension condition suitable for fiber opening, a tension device was used to passively feed yarn at a constant tension.

Generally, tension washer type is used for constant tension yarn feeding.
Tension devices such as gate tensor type and spring type are widely used, but these have low yarn feeding speeds and are unable to produce continuous multifilament with relatively weak tension while the unwinding tension from the package is low. The yarn can be fed to the opening zone, but as the yarn feeding speed increases, the increase in unwinding tension is directly amplified by the tension device and transmitted to the opening zone, which impedes the opening effect and causes yarn unevenness. This caused malfunctions and became a major obstacle to increasing speed.

Furthermore, in such a constant tension yarn feeding method, the opened filament is tightly wound around the spindle, so the resulting yarn tends to be compact and lack bulk. Since the yarn is actively fed, differences in yarn feeding speed between spindles cannot be avoided, and the denier of the obtained yarn varies greatly between spindles.

In order to eliminate these drawbacks, it is necessary to install a feed roller between the package and the opening zone and actively feed the yarn at a constant length. If the value obtained by dividing the winding speed (difference between the winding speed of
If the following is true, the continuous multifilament yarn will be under tension and will not be opened at all, and the adjustment will be very delicate.
With high-speed yarn feeding, it was practically impossible to maintain proper conditions.

On the other hand, a method of opening the fibers using a high-speed fluid using a fluid nozzle (for example, Japanese Utility Model Publication No. 4732/1983) is also known.
According to this method, it is also possible to use a feed roller, and the opening force is generally stronger than that of the above-mentioned electrical opening method, but the fluid after discharge tends to become turbulent, and the opened filament This tends to lead to an unstable and complicated state, and furthermore, when applied to the above-mentioned method for manufacturing yarns similar to spun yarn, the discharged high-speed fluid will inhibit the spread filament from wrapping around the spindle, resulting in uniformity on the spindle surface. It was difficult to form a sheet layer of filaments, and the yarn pulled out from the spindle had large irregularities, which was not very desirable.

Furthermore, there is a known method that is commonly used as a means to prevent the yarn from becoming entangled in the feed roller, in which a fluid nozzle called an ejector guides the overfed continuous multifilament yarn forward along with a high-speed fluid. When applied to the opening method, the filament group in the opening zone is affected by even the slightest airflow, and the high-speed fluid ejected from the ejector is significantly disturbed and makes it impossible to maintain a stable opening state. In extreme cases, the fibers may not be opened at all, and generally speaking, it is difficult to combine an ejector and an electric fiber opening device, and no examples have been put into practical use to date.

The present invention uses a feed roller to actively overfeed the continuous multifilament yarn and supply it to a constant length, and also prevents the yarn from getting tangled around the roller by the action of a non-conductive fluid. The present invention is intended to eliminate the drawbacks of conventional feeding methods by exhibiting a stable fiber opening effect even during high-speed yarn feeding through electric action.

In other words, the present invention opens a substantially untwisted continuous multifilament yarn and winds it onto the surface of a rotating spindle continuously in the direction of the axis of rotation of the spindle at a speed slower than the surface speed of the spindle. In this drawing method, the multifilament yarn is actively sent out at a speed higher than the surface speed of the spindle and ejected from the nozzle together with a non-conductive high-speed fluid, and a high voltage of 500 volts or more is applied in front of the nozzle. This is a method for producing a spun yarn-like yarn, which is characterized in that the fluid is brought into contact with a porous electrode, and its path is bent along with a portion of the fluid that is refracted and diffused on the surface of the electrode.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of a method for manufacturing a spun yarn-like yarn, in which a continuous multifilament yarn is supplied to a spindle 10 using a conventional constant tension supply method.

In the figure, a continuous multifilament yarn 2 unwound from a pirn 1 is introduced into a fiber opening device 9 through a guide 3, a tensor 4, and a guide 5, and is opened.

A part of the opened filament is discharged into the space in front of the spindle 10 and is led directly to the hollow hole without being wound on the surface of the spindle 10, and the other part is wound on the surface of the spindle 10. It is attached and sequentially moves to the tip of the spindle 10, where it is turned over and guided into the hollow hole.

On the other hand, the core yarn 7 is unwound from the pirn 6 and guided into the hollow hole from the tip of the spindle 10 through the guide 3, tensor 4, guides 5 and 8, and is drawn into the hollow hole along with the opened filament. The yarn is pulled out by a pull-out roller 12 at a speed lower than the surface speed, and wound up into a package 14 by a wind-up roller 13 having a traversing action.

15 is a guide bar. FIG. 2 shows the relative relationship between the electrode 9 and the spindle 10.

FIG. 3 shows a case in which filaments opened in a method for producing a spun yarn-like yarn are fed to the spindle 10 by the method of the present invention.

In the figure, a continuous multifilament yarn 2 unwound from a pirn 1 is actively fed out by a feed roller 16 through a guide 3, a tensor 4, and a guide 5, and a non-conductive high-speed fluid passes through a guide 17. The fibers are introduced into the fluid nozzle 18 introduced in the direction of the arrow, and are ejected together with high-speed fluid, contact the fiber-opening electrode 20 and spread the fibers, and are carried to the spindle 10 by a portion of the fluid.

Then, it is wound around a spindle 10 in the same manner as in the method shown in FIG. 1, and is pulled out together with the core yarn 1 as a spun yarn-like yarn 11.

The electrode 19 is provided as needed to correspond to the porous electrode 20, and has the function of making fiber opening more effective.

FIG. 4 shows a continuous multifilament yarn opening section, and in FIG. 4, the continuous multifilament yarn 2 fed out from the feed roller 16 is guided to the yarn introduction hole 23 of the fluid nozzle 18.

On the other hand, high-speed valve conductive fluid is sent from the fluid introduction hole 22 and is carried along with the continuous multifilament yarn 2 to the ejection hole 21.
The fluid is ejected from the porous electrode 20, which is placed at an angle ε with respect to the ejecting direction of the fluid, and to which a high voltage of usually 500 volts or more is applied.
The remaining part passes through the small diameter hole of 0 to the lower surface of the electrode, and the remaining part follows the upper surface of the electrode, refracts its path and diffuses, guiding the continuous multifilament yarn 2 in the direction of the refracted path, and passing through the spindle in front. Carry it to 10.

In the figure, a flat plate electrode is shown as an example of the electrode 20.

The continuous multifilament yarn 2 that is in contact with the porous electrode 20 and has been given the same kind of electric charge is transported in an almost tension-free state due to the action of the refracted and diffused fluid, and at the same time there is a repulsive force between the filaments due to the same kind of electric charge. Under the action of an electric field formed between the electrode 20 and a metal object placed in the vicinity thereof, the fiber is opened and wound around the spindle 10, and then deposited on the spindle 10. The thread moves to the core thread I, merges with the core thread I, and is drawn out through the hollow hole.

The electrode 19 is provided in order to effectively form the action of the electric field, particularly along the filament traveling direction, thereby further enhancing the filament opening action.

In order to effectively and stably perform fiber opening in the method of the present invention, the shape of the porous electrode 20, its surface condition, its porosity, the voltage applied to the porous electrode 20, the voltage applied to the porous electrode 20, the The flow rate, flow velocity, and state of the streamlines of the non-conductive fluid that refracts and diffuses on the upper surface of the porous electrode 20 after colliding with it, and carries the continuous multifilament thread in the refracting direction.
The positional relationship between the wire and other grounded objects that form an electric field, the feed ratio of the multifilament yarn to the spindle surface speed, etc. are important factors, and it is important to keep these within appropriate ranges.

9' is a power supply. FIG. 5 is a conceptual diagram showing the relationship between the fluid nozzle 18 and the porous electrode 20, where R is the flow rate of the non-conductive fluid supplied from the introduction hole 22 of the fluid nozzle 18, and R1 is the flow rate of the non-conductive fluid ejected from the ejection hole 21. R2 is the flow rate of the fluid that is refracted and diffused on the upper surface of the porous electrode 20 after being refracted, and R2 is the flow rate of the fluid that permeates to the lower surface of the porous electrode 20 through the small holes provided in the porous electrode 20. vinegar.

The flow rate R, is the continuous multifilament yarn connected to the porous electrode 20.
The flow rate should be kept low enough to allow a smooth transition along the top surface of the electrode without stagnation on the electrode. The force that guides the filament yarn in the traveling direction of the flow rate R1 attenuates the electrical force that opens the filament, making it impossible to stably open the filament.

In particular, all the flow rate R necessary to prevent the feed roller 16 from being rolled up is refracted and diffused on the porous electrode surface.
If the ratio is 2-0, the continuous multifilament yarn will hardly be opened and the effect of applying a high voltage to the porous electrode 20 will be lost, which is not preferable.

The flow rate R1 is controlled by the total flow rate R1 porous electrode 20.
In addition to the porosity of the hole and the angle with respect to the jet hole 21, it is also affected by the distance l between the jet hole 21 and the continuous multifilament thread contact position on the porous electrode 20, and as l increases, R increases. Due to the diffusion, R8 also decreases and is maintained at about 7=5 to 8071g1l by normal fiber opening action.

Here, the porosity of the porous electrode 20 is the ratio of the total area of small pores to the total area of the electrode, and if this is large, the flow rate R2
The continuous multifilament yarn is attracted to R2 and tends to stay on the electrode surface, causing entanglement among the filaments and hindering fiber opening, so the opening ratio is 20.
About 60% is preferable, and in order to make the transfer of the filament as smooth as possible, it is desirable that the holes be formed with small diameters so as to reduce the slip resistance.

In addition, the shape of the porous electrode 20 should be smooth at the outer edge without corners or protrusions because of the application of high voltage.
It is not limited to a flat plate shape as shown in FIG. 3, but various shapes such as a circular arc shape or a curved surface shape can be used.

The contact angle between the surface of the porous electrode 20 and the running multifilament is given by the angle between the extension line of the fluid ejection hole and the tangent line of the electrode surface that intersects with this. When the distance l from 20 is 5 to 812, it is preferably in the range of 300 or more and 800 or less.

When the angle ε becomes smaller than 300, the flow rate R1 becomes excessive and fiber opening is hindered.On the other hand, when the angle ε exceeds 800, the R2 force becomes too large and the continuous multifilament yarn becomes a porous electrode 20.
The porous electrode 20 tends to stay on top, making the running unstable.
Since the pressing force increases, the filaments tend to become entangled with each other and form loops, which is undesirable.

The non-conductive fluids used here include price, safety,
Although it is most preferable to use air from the standpoint of hygiene, the fluid is not particularly limited to air as long as it is non-conductive and poses no health and safety problems.

Further, the structure of the fluid nozzle 18 may be one that has normal performance such that the continuous multifilament thread is transferred as the fluid runs, but in order to suppress the fluid flow rate while preventing the thread from getting wrapped around the feed roller, it is necessary to It is better to make the introduction hole 22 as thin as possible.

Here, the continuous multifilament yarn 2 in contact with the electrode 20 is given an electric charge, and is opened only by the repulsive force of the electric charge, but by providing the electrode 19 near the opening area,
The fiber-spreading state is controlled and the fiber-spreading property is further improved.

When providing the electrode 19, the positional relationship between the porous electrode 20 and the electrode 19 cannot be determined in part by the voltage applied to the porous electrode 20, that is, the potential difference between the two electrodes, but if they are too far apart, the positional relationship between the porous electrode 20 and the electrode 19 will be determined. As the electric field becomes weaker, the opening properties are lowered, and to compensate for this, it is necessary to increase the voltage, which makes handling dangerous.

On the other hand, if the distance between the two is too small, spark discharge tends to occur, which is not preferable.

Furthermore, the electrode 19 is connected to the advancing continuous multifilament yarn 2.
The electric field formed between the porous electrode 20 and the porous electrode 20 is placed at an appropriate position in the opening direction during filament opening, and the opened filament Care must be taken to ensure that there is no bias in either direction.

Therefore, it is essential that the shape of the electrode 19 has a center gap sufficient to allow passage of the opened continuous multifilament yarn, but the opening state is also influenced by the shape.

Further, even when no independent electrode is provided, a grounded object having a potential difference with the electrode 20, such as a part of the fluid nozzle or a part of the machine stand, acts as a substitute for the electrode 19 and helps the fiber opening effect.

Furthermore, if the spindle 10 itself is grounded to function as an electrode, the opened filament will be more likely to wrap around the spindle 10, which is preferable for stable operation.

Note that in order to uniformly spread the fibers, it is necessary to apply a voltage of 500 volts or more to the porous electrode 20, and if it is less than that, sufficient fiber opening will not be carried out and is not preferred.

As described above, in the method for producing spun yarn-like yarn (in this case, in the conventional method for supplying continuous multifilament yarn mainly using electro-spreading), the variation between the weights of the denier of the manufactured yarn can be reduced within a small range. It was difficult to manage and speed up the process.

In addition, there is a method of actively overfeeding with a feed roller and using a fluid nozzle to supply a constant length, but the discharge flow prevents the opened filament from getting clapped onto the spindle, resulting in yarn unevenness. However, according to the present invention, there is no difference between the spindles, and even at high speeds, a very stable opening effect can be obtained, and the wrapping on the spindle is also stable, and there is no problem with the feed roller. This makes it possible to operate smoothly without any problems.

FIG. 6 shows a case in which continuous multifilament yarn drawing steps are connected in carrying out the present invention.

In the same figure, a supplied raw yarn 25 with a large residual elongation, which is usually called undrawn yarn or POY, is in a package 2.
Two sets of rollers 26 and 1 are unwound from 4 and are paired.
6 and is first stretched to an appropriate magnification.

The continuous multifilament yarn 25 sent out from the feed roller 16 is guided to a grounded fluid nozzle 18 into which a non-conductive high-speed fluid is introduced from the direction of the arrow, and is ejected together with the high-speed fluid to the porous flat plate electrode 20. The fibers are opened while changing their course.

Some of the filaments enter the hollow hole directly from the tip of the grounded spindle 10, while others wrap around the spindle 10 and are sequentially transferred to the tip, turned over into the hollow hole, and merge with the filament that directly entered the hollow hole. As a result, it becomes a spun yarn-like yarn 29 and is pulled out.

In the stretching section between the rollers 26 and 16, in addition to a hot pin 27, a real plate 28, etc., depending on the material of the yarn, although not shown, a hot roller etc. may be used as appropriate.
placed and used.

As described above, since the present invention can use a feed roller, it can be connected to the drawing process, and the cost disadvantage of the present manufacturing method of making thick yarn from thin yarn, that is, doubling, can be solved. The process can also be shortened.

Example 1 Using the conventional continuous multifilament yarn feeding method shown in FIG. 1 and the method of the present invention shown in FIG.
It looked like the picture.

Conditions: Polyester multifilament yarn for opening 3
0D-18f, polyester multifilament yarn for core yarn 150D-48f, spindle tip diameter (Dl) =
2.0M, spindle taper angle 2°, core yarn insertion angle α-60°, β-105° electrode applied voltage -4,50
0 volts, doubling number -6,00 The method of the present invention further uses air as a fluid, and air pressure = 0.7 Kt/
crA g, overfeed ratio to spindle surface speed -5 factor, angle ε of porous electrode to jet direction
60°, distance from nozzle to porous electrode 7 = 20M
, the condition that the porosity of the porous electrode is 40 is added.

However, in the figure, the mark indicates the conventional supply method, and the mark ○ indicates the method of the present invention.

As can be seen from Figure 7, there is almost no difference between the conventional method and the method of the present invention up to a yarn feeding speed of 600 m/l1lt'n, but beyond that, there are obvious differences due to the feeding method. In the conventional method, the tension in the opening zone increases, making it impossible to spread the fibers uniformly, and yarn unevenness increases rapidly.

On the other hand, in the method of the present invention, the increase rate is small;
It is desirable.

Example 2 Same conditions as Example 1 (yarn feeding speed 500 m/ym'
Table 1 shows the average denier of the produced yarn and the inter-spindle variation rate of the denier when processed using five spindles.

As is clear from Table 1, the difference between denier weights is smaller in the method of the present invention than in the conventional method.

It seems that the difference between the weights of the present invention is mainly due to measurement errors.

Example 3 Polyester undrawn continuous multifilament yarn 105
D-12f is stretched by 35 times in a stretching zone equipped with a stretching pin 27 and a hot plate 28 using the apparatus shown in FIG.
supply to.

Compressed air of 0.8 Kp/iG is supplied to the fluid nozzle 18, and the drawn multifilament yarn is connected to a porous flat plate electrode of 30 meshes to which a voltage of approximately 7,000 volts is applied together with this air flow. 20 (open area rate approximately 30%,
The S1 hollow spindle 10 [tip diameter 2.01g1. Medium, taper angle 2°, rotation speed 75.
00 Or, p, m, ), a part of the multifilament yarn wraps around and accumulates on the surface of the spindle 10, and successively moves to the tip of the spindle, where it enters the hollow hole. It is turned over towards the target.

On the other hand, another multifilament yarn (drawn polyester yarn 100D24f), which is not shown, is supplied to the hollow hole of the spindle 10 from above the spindle, and the remainder of the filament that is being opened and progressing is directly wound around the core yarn.
Further, at the tip of the spindle, a portion of the filament is turned inside out, thereby coating and twisting it.

The two-layer yarn 29, which has a loop-shaped and incompletely covered structure in which multifilaments are individually dispersed around the core yarn, is pulled out from the hollow hole of the spindle 10, and
It was wound at a speed of m /mt7L.

The obtained thread has a thickness of 256D and moderate thread unevenness (U% is 18
) with a bulky, spun yarn-like texture.

[Brief explanation of drawings]

Figures 1 and 2 are perspective views of an apparatus used in a conventional method for producing spun yarn, Figures 3 to 7 are related to the present invention, and Figure 2 shows the relative relationship between the electrode and the spindle. FIG. 3 is a perspective view of the apparatus in the method for producing spun yarn-like yarn, FIG. 4 is a conceptual diagram of the vicinity of the opening section of continuous multifilament yarn, and FIG. 5 is a diagram showing the connection between the fluid nozzle and the electrode. A sectional view showing the relationship, and Figure 6 is a front view of the device connected to the stretching device.
FIG. 1 is a graph showing the relationship between yarn feeding speed and yarn unevenness. 2... Continuous multifilament yarn, T...
... Core yarn, 9' ... Power supply, 10 ... Conical or cylindrical spindle, 11 ... Spun yarn-like thread, 18 ... Fluid Nozzle, 19...
... Counter electrode, 20 ... Porous opening electrode.

Claims (1)

[Claims] 1. A substantially untwisted continuous multifilament yarn is opened and wound around the surface of a rotating conical or cylindrical spindle, and continuously at a speed lower than the surface speed of the spindle in the direction of the axis of rotation of the spindle. In this method, the continuous multifilament yarn is actively fed out at a speed higher than the surface speed of the spindle, and is ejected from a nozzle along with a non-conductive high-speed fluid, so that the continuous multifilament yarn is A spun yarn style characterized by contacting a porous electrode to which a high voltage of 500 volts or more is applied, and refracting the course of the fluid along with a part of the fluid that is refracted and diffused on the surface of the electrode. How to make yarn.