JPS6056804B2 - Manufacturing method and device for wrapped yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method and apparatus for manufacturing a wrapped yarn.

In the present invention, a wrapped yarn refers to a yarn composed of a core fiber bundle existing inside the yarn and a group of fibers surrounding the core fiber bundle. Conventionally, wrapped yarn is produced by the so-called air spinning method using an air injection nozzle, but its quality is incomparably inferior to that of general ring yarn, and its strength is particularly low.
Due to its poor appearance and hard feel, it has not yet reached the stage of practical use. An object of the present invention is to eliminate these drawbacks of conventional wrapped yarns and to provide a method and apparatus for producing wrapped yarns having quality equal to or higher than that of ring yarns. Typical examples of such conventional wrapped yarns and their manufacturing methods are those disclosed in Japanese Patent Publication No. 43-28250 or Japanese Patent Publication No. 49-1982.
138382 is known.

The wrapped yarn specified in Japanese Patent Publication No. 43-28250 is defined as "a bundle of core fibers with virtually no true twist and a bundle of core fibers in an irregular spiral shape with various angles within the range of 100 to 800 degrees." a spun yarn comprising a core of virtually interrupted textile fibers interconnected in a tight bundle characterized by a surface envelope with a significant amount of true twist imparted by surface fibers tightly twisted around the ”. As shown in the specification, a core bundle with virtually no true twist is defined as a ribbon-like fiber bundle taken up from a drafting device by an aspirator and fed to a torque jet. Consisting of a majority of core fibers that are similarly twisted and a small amount of surface fibers that are twisted to a lesser degree, when this fiber bundle passes through the centerline of the torque jet, the core fibers are twisted as in the normal pseudo-twist method. It is obtained by rotating the fibers so that they are completely untwisted, and the core fiber bundle is simply heated and untwisted without any disturbance, resulting in a fiber bundle consisting of parallel fibers. exist. Such a core bundle of parallel fibers does not contribute to strength. The strength of this wrapped yarn is therefore provided by a small amount of surface wrapping fibers tightly twisted around the core bundle. On the other hand, in the case of general ring yarn, all the fibers in the yarn "migrate" from the outer layer to the inner layer and from the inner layer to the outer layer, so when the ring yarn is pulled, each fiber When the fibers are in close contact with each other, strong yarn strength is generated due to the frictional resistance between the fibers. Therefore, in the case of the wrapped yarn specified in Japanese Patent Publication No. 43-28250, there is no "migration" of the fibers as in the ring yarn, and its strength is at most 70% that of the ring yarn.
It only reaches . Moreover, the strength of such a thread can only be obtained by the surface fibers tightly wound around its outer periphery, so if the strength is to be increased, the number of surface fibers must be increased, which leads to hardening of the thread surface and makes it stiff. It is only possible to make cloth with a soft texture, and if the amount of hard surface fibers is reduced, the result is a thread that can be pulled out by a slight tensile force, so it has not yet been put to practical use. On the other hand, in Japanese Patent Publication No. 49-38382, a composite was treated with a turbulent fluid flow to intertwine the fibers constituting the composite yarn, and also to give loops, slack, and fuzz due to short fibers, and then the fibers protruding from the yarn surface. A method for producing a no-twist spun yarn is disclosed, which is characterized by winding fluff around the outer periphery of the yarn.

However, when it comes to threads for general textiles and knitting, beauty and evenness of the thread surface is the most important requirement.
The presence of sagging etc. is a cause of deterioration of the appearance of the fabric and should be avoided. Furthermore, if loops or slacks exist in the yarn, the yarn will inevitably be weak and cannot withstand the knitting and weaving processes. Due to these drawbacks, wrapping yarn produced by this method is also not practical. The present invention aims to eliminate these drawbacks of the prior art and provide a method and apparatus for manufacturing wrapped yarn that has strength equivalent to that of ring yarn and has an appearance that is equal to or better than link yarn. purpose.

That is, the wrapped yarn obtained by the present invention has a stay. A wrapped yarn made of a mixture of bull fibers or stable fibers and filament fibers, in which each fiber or bundle of fibers consisting of several fibers constituting the central core is irregular along the longitudinal direction of the yarn. It is a yarn that is heated and entangled with each other in a state of Because the fibers move, the core alone has considerable strength. Furthermore, in the wrapped yarn of the present invention, some of the fibers constituting the central core are wound around the outer periphery of the central core, so that when the yarn is pulled, the wound fibers are removed from the already entangled fibers of the central core. As the bundle is tightened, the strength will increase. Moreover, unlike the wrapped yarn disclosed in Japanese Patent Publication No. 49-138382, the wrapped yarn according to the present invention has no loops or slack in the fibers that make up the wrapped yarn, so the yarn surface is It has an extremely symmetrical shape.

Therefore, the yarn according to the present invention overcomes the drawbacks of low strength and poor appearance in the prior art, and is a practical yarn that can be used in the market as a general high-grade yarn. Next, the method and apparatus for manufacturing the wrapped yarn according to the present invention will be explained, and the structure of the wrapped yarn will also be explained in detail. The method for producing a wrapped yarn according to the present invention is to produce a fiber bundle consisting of a mixture of stable fibers and continuous filament fibers, which have alternating ejection directions of SNZ and a plurality of ejection ports for compressed fluid streams with different rotational forces. By introducing and passing through one fluid nozzle having a fiber bundle, the fiber bundle is simultaneously rotated, heated, untwisted, tensioned, and entangled, and the core is formed around the outer periphery of the bundle of cores having entangled loops without slack. There is a type of fiber that is made of a part of the fiber that is tightly wound.

The outline of the invention is explained with reference to FIG.

In FIG. 1, the supplied roving S is held by a pair of jig rollers 17 and a pair of middle rollers 16, and is drafted by the difference in their circumferential speeds, and is advanced by the running of a pair of flons 18. The front roller 10 rotates at high speed, pulls out a fiber bundle equivalent to one thread from the advancing fiber bundle, and supplies the fiber bundle toward the axis of the fluid nozzle 1. The fluid nozzle 1 includes a yarn passage 4 and an orifice 3 that separates the yarn passage in the middle, spouts 21 and 2 for spouting a compressed fluid stream in a tangential direction to the yarn passage, and a fluid inlet 26 for supplying the compressed fluid stream to the fluid nozzle. It consists of a fluid reservoir 30. The fiber bundle supplied by the front roller 10 passes through the yarn path 4 and is given S and Z twists by the action of the compressed fluid flow to form a yarn.After passing through the fluid nozzle 1, it is untwisted by the delivery roller 11. It is grasped and sent out. The basis of the fluid nozzle used in the present invention is US Pat. No. 30093(1).
Already known in No.

This known fluid nozzle is shown in Fig. 3-a (longitudinal sectional view) and Fig. 3-b.
3-c (cross-sectional view). Reference numeral 1 represents a fluid nozzle body, and reference numeral 2 represents an ejection port (hereinafter referred to as ejection port) for ejecting a compressed fluid stream.

Here, the ejection direction of the ejection port 211 and the ejection port 22 is opposite. For example, if 21 is the S twist direction, then 2■ is the Z twist direction. The method for producing a wrapped yarn of the present invention is achieved by utilizing the above-mentioned known nozzle having a reverse direction spout and adding improvements thereto.

A sectional view of the simplest fluid nozzle used in the present invention is shown in FIG.

In FIG. 4, two rows of jet ports are shown, and the jet ports in row I are designated as 21, and the jet ports in row ■ are designated as 2. Spout ports 21 and 2■
The direction of ejection is reversed as shown in FIG. An orifice 3 is provided between the jet nozzle groups 21 and 22, and serves to throttle the compressed fluid flow flowing out from the jet nozzles and change the direction of the flow.

Here, the flow of compressed fluid in a known fluid nozzle having a reverse ejection port (FIG. 5) will be compared with the flow of compressed fluid in a case where the orifice of the present invention is provided (FIG. 6).
The locus of the compressed fluid flow coming out of the jet nozzle 21 is 6, and the jet nozzle 2 is
Let 7 be the locus of the compressed fluid flow coming out of . In the case of the known nozzle shown in FIG. 5 (without the orifice 3), the swirling airflow 6 flowing along the pipe wall 9 of the yarn passage 4 collides with the swirling airflow 7, creating a turbulent flow and the flow rate in the longitudinal direction of the pipe becomes significant. decreases rapidly.
Therefore, the swirling ability of the compressed fluid is weakened, and even when the thread is threaded through the thread passage 4, the number of revolutions thereof is significantly reduced. In this case, the number of rotations and the direction of rotation of the thread are determined by the difference in the ejection force between the ejection ports 21 and 2. Rotate in the direction.
Therefore, the effect of this known nozzle is only that the rotational speed of the thread is reduced compared to a nozzle with a unidirectional outlet. On the other hand, when orifice 3 is provided in the thread passage (sixth
In the figure), the compressed air flow jetted out from the jet nozzle 21 hits the pipe wall of the yarn passage 4. The swirling locus 6 is drawn along the line 91, but it is eventually narrowed by the orifice 3 and collides with the shoulder 8 of the orifice 3, and the swirling component of the airflow decreases and most of the flow becomes an axial flow and flows through the yarn path 4. It advances in the direction of thread travel while gradually spreading out approximately in the center of the thread. Therefore, this airflow 6 does not interfere with the swirling airflow 7 which is in the opposite direction and flows along the tube wall 9. In the case of the nozzle shown in FIG. 6 provided with the orifice 3 in this way, the swirling air flows 6 and 7 are not weakened and rotate the respective threads in opposite directions. This situation is shown in FIG. The thread is indicated by Y, and its direction of travel is indicated by X.
In FIG. 7, yarn Y is falsely twisted in the Z direction in section 1, and false twisted in the S direction in section 2. FIG. 7 is a conceptual diagram showing the direction in which the yarn turns. In the case of the present invention, the yarn is actually placed in a tensioned state under a certain tension, so the extreme turning movement as shown in FIG. 7 is not performed. A kind of single string vibratory turning motion as shown in FIG. 9-a is performed.

Next, the distribution of the number of twists will be explained with reference to FIGS. 8 and 9. Fig. 8 shows the case where the nozzle has one spout 2, as shown in Fig. 8-a, and when there is no orifice at the nozzle end, as shown in Fig. 8-b, the point 14 where the thread touches the center line of the spout The number of twists reaches a maximum near , and gradually decreases toward the front roller 10 and the delivery roller 11 asymmetrically before and after that.

On the other hand, it has been confirmed that when orifices are provided before and after the spout 2 of the nozzle as shown in Figure 8-c, the way the twist is propagated changes. In other words, as shown in Figure 8-d, on the heating side (upstream side with respect to yarn progression), attenuation of the number of twists is prevented, and on the contrary, the twist is well transmitted to the upstream side, whereas on the untwisting side On the downstream side (with respect to the progress of the yarn), the number of twists rapidly decreases at the orifice, and only a small amount of twist is transmitted. The reason for this is that when the balloon is squeezed by the nozzle due to the rotation of the thread, knots are created in the balloon and the length of the balloon is shortened, which increases the heating (or untwisting) effect. It is thought that the phenomenon of untwisting is occurring frequently. In the present invention, by providing this orifice in the middle of the jet ports in the forward and reverse directions, we focus on two points: (1) to cause both the S and Z rotations described above to occur in the yarn, and (2) the peculiarity of the twist transmission described above. However, by utilizing this, they were able to invent a method for producing wrapped yarn with a novel structure.

In particular, in the present invention, in order to form the core of the wrapped yarn, the fiber bundle is supplied to one nozzle having jet ports for compressed fluid that jets out in opposite directions to each other, and the heating power between the jet ports is varied. It is important that the thread be kept under tension during the process in which it passes through the nozzle. How the core portion of the wrapped yarn is formed will be explained below.

The twist distribution using the nozzle of the present invention will be explained with reference to FIG.

Here, it is assumed that the direction of rotation by the spout 2 is S twist, and the direction of rotation by the spout 21 is Z twist. There is a difference in the rotational force between the two as described later. Figure 9-b shows the twist distribution when the jet nozzle 21 and the jet nozzle 2■ are operated independently.
It is drawn in correspondence with the positional relationship of each element in figure a. The vertical axis has an S twist (+) and a Z twist (-). Therefore, the twist distribution due to the jet nozzle 21 is represented on the (-) side, and the twist distribution due to the jet nozzle 2 is represented on the (+) side. In this case, the spout ports 21 and 2 are arranged so that the number of twists SI and ZI of both the spout port portions (10 parts) of the spout port 21 are approximately equal.
■Adjust the rotational force by. The rotational force caused by the jet nozzle is of course the rotational force of the thread due to the compressed fluid flowing out from the jet nozzle, and the diameter, shape, and number of the jet nozzle, the pressure of the fluid at the jet nozzle and the inlet 13, and the angle of inclination of the jet nozzle with respect to the nozzle axis. Although it is determined by O, it also changes depending on the length K of the yarn exposed to this swirling airflow and the diameter D of the yarn path. Therefore, by appropriately determining these dimensions and pressures, it is possible to make the amounts of twist SI and ZI approximately equal in both the S and Z twist distributions in (10 parts). In order to equalize the amount of twist SI and ZI in this way, there needs to be a difference in the rotational force (specifically expressed as the number of twists ZI, S) at each ejection part, and in this example, the amount of twist SI and ZI are equal.
If the number of twists in the part ■O of the ejection outlet due to ■ is S■, then S■>ZI. The yarn actually passing through the yarn passage 4 has a twist distribution equal to the difference between the twist distribution due to the spout 2 and the twist distribution due to the spout 21. This is shown in Figure 9-c. The most important section in Figure 9-c is the section a-
The number of twists is O or equal to O in the part d (the part where the spout 21 turns in the Z direction). S,
If the Z twists are simply combined, it is possible for twist to appear in the sections a and c, but in reality, the S twist at the spout 2■ is untwisted or close to untwisted, so it exceeds the interval cmd. Since the fibers do not move forward, the sections a to d are considered to be in a non-twisted or nearly non-twisted state. Further, it is not necessary that the twist is always completely zero in the section a to d. There is no problem in that SI is slightly larger than ZI and a sweet S twist appears in the section a to d. The sweet S twist is a sweet twist that allows the fibers to be opened and entangled by the swirling air current 15. Hereinafter, this level of no-twisting or slight twisting will be referred to as substantially no-twisting. Traditionally, twisted yarn is supplied to a fluid disturbance area to defibrate the yarn (Japanese Patent Publication No. 43-28263) (Japanese Patent Publication No. 31-5976)
) is also known, but the present invention differs in that it supplies fiber bundles that are essentially non-twisted. Here, if the distance of interval a-d is 1
If the length of the yarn is longer than the longest of the fibers supplied, there is a high probability that the yarn will break off in sections a to d where the yarn is substantially untwisted, ie, untwisted or close to untwisted. Therefore, it is desirable that the distance 1 be shorter than the maximum fiber length, and further shorter than the average fiber length. The following phenomenon occurs in this section a to d in which there is substantially no twisting. Thread passage 4
A cross-sectional view at section c is shown in FIG.

In FIG. 10, a compressed fluid flow 15 is ejected from the ejection port 2 and collides with the rotating yarn bundle Y. Since the yarn bundle is in a substantially untwisted state in this time interval a-d, there is almost no cohesiveness among the fibers, and the fibers are easily opened, split, and mixed by the collision of the compressed fluid flow 15, and the fibers are Each of the single fibers or bundles of fibers that made up the bundle are disrupted from their previous parallelism, and at the same time are rotated and randomly twisted. To explain this state in more detail, FIG. 10 shows the compressed fluid flow 15
collides with the yarn Y shown in each fiber cross section. Since the yarn Y is substantially untwisted, each fiber F is separated and opened by the force of the compressed fluid flow 15 without any focusing force, and the compressed fluid flow 15 flows between the fibers and displaces or rotates each fiber. The mutual positional relationship of the fibers can be changed by Of course, not all the fibers are completely separated, but there are cases where two or three fibers cluster together and rotate or change position. This state continues for the section from c to d, and each single fiber F or these bundles constituting the fiber bundle corresponding to the central core of the yarn bundle are entangled with each other and twisted, resulting in a state as shown in Fig. 11. Become. A further important feature of the invention is that the thread passing through the nozzle is placed under constant tension. If the yarn is loosened more than necessary in the nozzle, when the compressed fluid flow collides with the fiber bundle, which is essentially untwisted in the cmd diagram, most of the loosened fibers will become loops, slack, etc. This disturbs the appearance of the threads that will be formed later, making the threads dull and rough, resulting in low economic value. Further, the graph of stress elongation obtained by subjecting the yarn spun in such a relaxed state to a tensile tester resembles the curve A in FIG. 12. As the loops and slack existing in the thread are gradually stretched, the stress rises and falls, reaching the maximum stress P while drawing an uneven curve. Further, even after reaching the maximum stress P, the thread does not suddenly break there, but gradually comes out, and the stress decreases. In this regard, in the present invention, by limiting the ratio of the circumferential speeds of the front roller 10 and the delivery roller 11 within a certain range, the thread Y gripped and progressing between them is kept in a tensioned state, and there is no substantial loss in the section a to d. A compressed fluid flow 15 is applied to the twisted yarn to defibrate, intertwine, and entangle the yarn without forming loops or slack. However, if excessive tension is caused, not only will defibration by the compressed fluid flow become impossible, but it will also cause yarn breakage, which is not preferable. As a result of experiments, the inventor determined that the circumferential speed of the front roller 10 was
It was confirmed that it is optimal to set the feed in a range of +10% to -5% from the circumferential speed. here +
With a 10% overfeed, the yarn Y will theoretically be relaxed between both rollers, but in reality, the yarn Y will twist and shrink due to heating by nozzle 1, and the yarn in the cmd section will be in a tensioned state. It will be destroyed. When acrylic Nm48!3 is spun at a yarn speed of 160TrL,/Min and the overfeed rate is +6%, the tension between cmd is 2.
It was 0y to 25g. However, there is a limit to this twisting and shrinkage, and when the above-mentioned overfeed rate exceeds 10%, the yarn stress elongation curve becomes like A in Figure 10, confirming that loops and slack have occurred in the yarn. . Furthermore, if the overfeed rate is -5% or less, the yarn in the section cmd, which is in a substantially untwisted state, can be easily drafted and pulled out, but due to incorrect drafting, yarn unevenness becomes large and at the same time, the yarn in the section cmd becomes untwisted. A situation occurs in which the thread strength is inhibited, leading to a decrease in thread strength. Therefore, the above overfeed rate is +
It is necessary to be between 10% and -5%. The wrapped yarn obtained by the present invention is subjected to the opening action of the compressed fluid flow under a constant tension state as described above, so that loops and slack are not formed in the core or on the outer surface, and the core is Since the fibers to be formed are intertwined, twisted, and mixed, the curl elongation curve is similar to that of a ring yarn, as shown in FIG. 12B.

The process of forming the central core of the wrapped yarn in the present invention and the structure of the core have been clarified by the above-mentioned explanation of the state of fibrillation, entanglement, and twisting of the yarn and the state of tension of the yarn using the novel nozzle. .

Next, a description will be given of how the surface fibers wound around the outer periphery of the core are generated and fixed as a surface envelope. For ease of understanding, in FIG. 1, which is an overall view, the back roller 17, middle roller 16, fluorocarbon 18,
A plan view of the front roller 10 with the upper half removed is shown in FIG. In FIG. 2, one roving S is supplied, but there may be two or more rovings. However, as described below, 2
The effect is that the amount of surface fibers wound around the outer periphery of the wrapped yarn increases when the number of yarns is larger than this. The roving yarn S is supplied to a back roller 17, then advances while being drafted by a flon 18, and is then gripped and pulled out as a fiber bundle 19 for one yarn by a front roller 10 rotating at high speed. At this time, the roving fed to the front roller is completely or almost untwisted, and the parallelism is disturbed even by a slight air current that collides with the roving, and a part of the roving becomes fluffy. protrude outward. On the other hand, since the front roller is rotating at a high speed, a considerable amount of accompanying airflow flows around the front roller, and this airflow changes its direction in the axial direction of the front roller 10 near the nip line. Therefore, the roving S is the front roller 1
Immediately before being nipped, the fiber ends are protruded by this accompanying airflow, and some of the fibers protrude outside the roving S as protruding ends 20. The protruding end 20 is gripped and pulled out by the front roller 10 like other parallel fibers, but its protruding state remains unchanged. The fiber bundle 19 including these protruding ends 0 is twisted when passing through the yarn path 4 of the nozzle 1, but as mentioned above, this twist is substantially constant from the nip point a of the nip roller to the entrance d of the orifice 3. It is untwisted and then has a twist distribution in the S direction. In this way, the fiber bundle 19 is twisted at the entrance d of the orifice 3, and becomes a yarn Y thereafter. However, even after the yarn Y is formed at the entrance d of the orifice 3, the protruding end continues to protrude from the outer surface of the yarn Y as long fluff. The protruding ends 20 protruding as fluff then become surface enveloping fibers that are wound around the outer periphery of the wrapped yarn of the present invention, and most of the fiber bundle excluding the protruding ends 20 forms a central core bundle. . Therefore, in order to obtain sufficient surface-enveloped fibers, it is necessary to generate sufficient protruding ends, but in terms of supply and the number of rovings, two or more rovings are more advantageous than one. On the other hand, spout 2■
For example, if the ejection direction is the S direction, the twist transmission diagram (No. 9
As can be seen from the explanation in Figure), the direction of the twist that is propagated to the entrance d of the orifice 3 is the S direction.

In the section a to d of FIG. 9, the fibers are exposed to the rotating airflow 15 in the Z direction in a substantially untwisted state, and are subjected to opening, mixing, twisting, etc. as described above. In addition, in the section a-d, the fiber ends existing in the yarn core are exposed to the compressed fluid flow 15, and some of them are blown out of the yarn bundle and form the above-mentioned protruding ends 20. Projects out of the thread bundle as a similar projecting end. In this way, the protruding ends 20, including both the originally existing protruding ends and the newly generated protruding ends, are exposed to the swirling airflow 15, which is a compressed fluid flow and rotates in the Z direction, around the yarn core in the Z direction. It's tight. However, this winding is caused by air currents at most, so it is not strong and is only lightly rolled. In this way, the “core bundle” becomes the core.
The thread Y, which is made up of the "surface fibers entwined with protruding ends consisting of part of the fibers constituting the core", passes through the orifice 3, is twisted in the S direction, and is exposed to the compressed fluid from the spout 2■. After reaching the exposed point f, it is strongly untwisted.
Therefore, the point at which the core has a twist distribution in the S direction (e or f
), the surface enveloped fibers that had previously been Z-twisted become lightly twisted or non-twisted, but when they pass through point f and are strongly untwisted, a substantial Z-twist is added and the fibers are tightly wound around the core. I will do it. In this way, a surface envelope fiber is formed that is wound around the outer periphery of the core. On the other hand, even after the core part is untwisted, as mentioned above, the single fibers or bundles of several fibers constituting the core are heated and intertwined with each other in an irregular manner along the longitudinal direction, and the loops,
It exists without slack.

This entanglement and twisting exists stably in the core because the core is firmly tightened by the surface envelope fibers. The feed roving used in the present invention does not need to be 100% stable fiber. Especially when you want to increase strength, yarn properties (e.g. washability, wrinkle resistance, anti-shrinkage, etc.)
When it is desired to improve the thread breakage or to reduce yarn breakage, the filament fiber bundle 22 can be supplied to the front roller. FIG. 1 shows this configuration. The filament fiber bundle 22 may be supplied from the cheese 23, but it may also be directly supplied immediately after passing through the drawing process. When a filament fiber bundle is inserted, it is preferable that it is inserted into the core of the wrapped yarn, except in the case of yarns for special purposes. This is because it causes staining spots and the like. Therefore, it is desirable to feed the filament fiber bundle to the center of the feeding roving S which is being drafted. (Figs. 1 and 2) When two rovings are supplied, they may be fed between the rovings, and when three or more rovings are supplied, they may be fed substantially at the center. Further, in order to facilitate opening in the section cmd, it is desirable to supply the filament fiber bundle with no twist or a slight twist. Up to now, we have described the case where there are one row of jet ports on each side of the orifice 3 in opposite directions, but the number of rows of jet ports may be three or more.

FIG. 13 shows a case where two rows of jet ports are arranged on each side of the orifice 3.

The number of rows and number of jet ports may be asymmetrical with respect to the orifice. Further, the number of orifices is not limited to one, and may be multiple. FIG. 14 shows a case where three orifices are provided and the jet outlet group is divided by these. When the respective jet nozzle groups are 21, 2■, 2■, and 2■, the jetting direction is alternately opposite to each jet nozzle group.
However, the direction of ejection within one group of ejection ports is constant. As mentioned above, the rotational force due to the jet nozzle changes depending on the pressure at the inlet of the jet nozzle. Therefore, as shown in FIG. 15, the compressed fluid sources supplied to each group of ejection ports are divided into groups, and compressed fluids with different pressures are supplied from separate compressed fluid sources to the fluid passages 26.
1,262, and may be supplied via fluid reservoirs 28,29. In the present invention, a part of the yarn Y is substantially untwisted, and the untwisted part is opened, entangled, and
This effect can be achieved even more efficiently if the fluid flow shifts to a state of disturbance midway through.

Such an action results in a compressed fluid stream outlet 2 just before the orifice.
It has been confirmed through experiments that the provision of 7 provides a powerful effect (Fig. 15). This is because a portion of the compressed fluid flow that was previously swirling suddenly changes direction and is discharged, causing disturbance to the fibers. Also, by spraying a stream of compressed fluid onto such untwisted yarn, extremely short fibers, fiber residue, leaf residue, etc. contained in natural fibers may separate from the yarn and accumulate at the orifice entrance, causing problems such as blocking the orifice. However, by providing this discharge port 27, short fibers, etc. are discharged from there together with the fluid, avoiding the above-mentioned troubles, and at the same time, impurities such as leaf residue contained in the yarn are removed, improving the quality of the yarn. It also has the advantage of improving. However, if this outlet is made too large and the yarn is completely exposed to the atmosphere, the disturbance caused by the airflow will be hindered and the strength of the yarn will be reduced. In addition, unreasonable situations may occur, such as the yarn flying out of the outlet at the start of spinning, making spinning impossible. Therefore, it is desirable to provide a valve (not shown) for adjusting the amount of exhaust air passing through the exhaust port 27, or to change the cross-sectional area of the exhaust port depending on the yarn type, count, etc. Providing the orifice 12 at the entrance 5 of the yarn passage 4 as shown by the dotted line in FIG. 4 stabilizes the rotation of the yarn Y by the spout 21 and at the same time provides a gripping point for the fiber bundle, so that the fiber bundle is well focused. This has the effect of preventing the thread from coming off in the section a to d.

Fibers that can be used in the present invention include all natural and synthetic stable fibers and continuous filament fibers.

Natural fibers include, for example, cotton wool, silk, ramie, flax, shoot hemp, hemp, and synthetic fibers include polyester, polyamide, acrylic, cellulose fibers such as cellulose acetate, polyethylene, polypropylene, polyvinyl, and the like. Although the fluid that can be used in the compressed fluid nozzle of the present invention includes any gas, it is advantageous to use compressed air, which is readily available. The usefulness of the present invention is listed below.

(1) Operation is fast.

According to this device, 48 l of acrylic Nm can be processed at a yarn speed of 160 Tr.
Spinning was possible at L/Min.

This is 17 times faster than the spinning speed of a ring spinning frame of 8,000 rpm for the same count. Also, by this method, the blending rate is 50
%-50% cotton and ester blend yarn (Nm6O'), the optimum spinning speed was 1507 TL/Min. This is 10,000 yarns of the same count made on a ring spinning machine.
This corresponds to about 13 times that when spinning at rpm. (2) A yarn with high strength can be obtained.

This wrapped yarn has a structure in which the fibers constituting the central core migrate and are further tightened by the surface fibers, so it has high tensile strength.

(3) A thread with a beautiful appearance can be obtained.

No loops, slack, etc. occur on the central core or outer surface, and a yarn with a uniform yarn surface and no unevenness can be obtained.

(4) Thin count yarn can be easily obtained.

Since the yarn sent out from the front roller is bundled with a stable twist, there is less yarn breakage and it is suitable for manufacturing fine count yarn.

(5) Homogeneous yarn is produced.

Leaves, neps, and short fibers contained in the roving are removed during the yarn production process, improving the uniformity of the yarn.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing the overall configuration of the device of the present invention;
Fig. 2 is a plan view of the same, Fig. 3 is a sectional view showing a known alternate twist nozzle, Fig. 3-b and Fig. 3-c are respectively J of Fig. 3-a.
-J. ．． KK sectional view, FIG. 4 is a sectional view of the nozzle of the present invention, FIGS. 5 and 6 are diagrams showing the air flow patterns of the known nozzle and the nozzle of the present invention, respectively, and FIG. 7 is the thread of the nozzle of the present invention. FIGS. 8 and 9 are diagrams showing the swirling pattern, and FIGS. 8 and 9 are diagrams showing the twist distribution due to the nozzle. FIG. 8 shows the case of a nozzle with one ejection port, and FIG. 9 shows the case of the nozzle of the present invention. Fig. 10 is a diagram showing the pattern in which fiber bundles are entangled by fluid flow, Fig. 11 is a diagram showing the entangled state of fibers, Fig. 12 is a stress elongation curve, and Figs. 13, 14, and 15 are 1 shows a cross-sectional view of each embodiment of the fluid nozzle of the present invention. DESCRIPTION OF SYMBOLS 1... Fluid nozzle, 2... Fluid spout, 3... Orifice, 10... Front roller, 11... Delivery roller.

Claims (1)

[Scope of Claims] 1. It has fluid jet ports whose jetting directions are sequentially reversed in the longitudinal direction, and b. An orifice is provided between the fluid jet ports, and the jetting directions of the left and right jet ports are aligned with each other across the orifice. 1. A fluid nozzle for producing wrapped yarn, characterized in that the twisting force is different in the opposite direction, and the twisting force is created by the jet ports provided on the left and right sides of the orifice. 2. The fibers sent out from the front roller are passed through a fluid nozzle having fluid jetting ports whose jetting direction is sequentially reversed in the longitudinal direction and having an orifice between the fluid jetting ports, and pulled out from the fluid nozzle by a delivery roller, and the fibers are pulled out from the fluid nozzle by a delivery roller. Increase the peripheral speed ratio of the front roller and delivery roller by +10% to -5%
A method for manufacturing a wrapped yarn, characterized in that the overfeed is set within a range of .