JPH0118168B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a novel method for manufacturing wrapped yarn.

[Conventional technology]

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 manufactured by the so-called air spinning method using an air injection nozzle, but its quality is incomparably inferior to that of general ring yarn, especially its strength is low, its appearance is poor, and
Because it is hard to the touch, it has not yet reached the practical stage.

Typical examples of such conventional wrapped yarns and their manufacturing methods are JP-B No. 43-28250 or JP-Ko-Kokko 1977-28250.
38382 are known. The wrapped yarn specified in Japanese Patent Publication No. 43-28250 is defined as ``a bundle of essentially untwisted core and fibers of the core arranged in irregular spirals at various angles within the range of 10° to 80°. a spun yarn comprising a core of substantially interrupted textile fibers bound together in a tight bundle characterized by having a surface envelope with a significant amount of true twist imparted by surface fibers tightly twisted around the bundle of ”. Here, a core bundle with virtually no true twist is defined as a ribbon-like fiber bundle that is taken up from a drafting device by an aspirator and fed to a torque jet, as shown in the specification, in the same way as a normal pseudo-twist. The fiber bundle consists of mostly core fibers that are twisted to a certain extent and a small amount of surface fibers that are twisted to a lesser extent, and when this fiber bundle passes through the center line of the torque jet, the core fibers are twisted as in the normal pseudo-twisting method. The core fiber bundle is simply twisted and untwisted without any disturbance, and exists as a fiber bundle consisting of parallel fibers. do. 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% of that of the ring yarn. 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, the composite was treated with a turbulent fluid flow to intertwine the fibers constituting the composite yarn, as well as to create loops, slack, and fuzz due to the short fibers, and then to make 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, the beauty and uniformity of the thread surface is the most important requirement, and the presence of loops, slacks, etc. in the threads will harm the appearance of the fabric and should be avoided. That's true. 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 impractical.

[Problem that the invention seeks to solve]

The purpose of the present invention is to eliminate these drawbacks of the prior art and provide a method for manufacturing a wrapped yarn that has strength equivalent to that of ring yarn and also has an appearance that is equal to or better than ring yarn. .

That is, the wrapped yarn obtained by the present invention is a wrapped yarn made of staple fibers or a mixture of staple fibers and filament fibers, and each fiber or a bundle of several fibers constituting the central core is The threads are twisted and intertwined with each other in an irregular manner along the longitudinal direction, and are referred to as "winding in Japanese Patent Publication No. 43-28250 in which the core fibers are substantially untwisted and exist in a parallel state." Unlike "covered yarn," the fibers "move" within the core, so the core alone has considerable strength. Furthermore, in the wrapped yarn according to the method of the present invention, some of the fibers constituting the central core are wound around the outer periphery of the central core, so when the yarn is pulled, the wound fibers are already entangled with the central core. Since the fiber bundle is tightened, the strength will increase even more.

Moreover, in the wrapping yarn according to the present invention,
Unlike the wrapped yarn specified in No. 38382, each fiber constituting the wrapped yarn has no loops or slack, so the yarn surface has an extremely uniform shape. Therefore, the yarn according to the present invention overcomes the disadvantages of low tenacity 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.

[Means for solving problems]

The method for producing a wrapped yarn according to the present invention includes a fiber bundle made of a mixture of staple fibers and continuous filament fibers, which has alternating ejection directions of S and Z, and has a plurality of ejection ports for compressed fluid streams having different rotational forces. By introducing and passing through one fluid nozzle, the fiber bundle is caused to rotate, heat untwist, tension, and entangle and turn at the same time, and the core is formed around the outer periphery of the core bundle having entanglement without slack in the loops. It has an inlet side fluid jet port and an exit side fluid jet port that sequentially reverse the jetting direction in the longitudinal direction of the fiber sent out from the front roller. The fibers are passed through a fluid nozzle having orifices at both fluid jet ports, and the number of twists applied to the fibers by the jets from the fluid jet ports on the inlet side and the fluid jet port on the exit side is approximately blowing a jet stream onto the fibers by adjusting the rotational forces of both fluid jets so that they are equal;
The fibers blown onto the jet stream are pulled out from the fluid nozzle by a delivery roller, and the circumferential speed ratio of the front roller and the delivery roller is increased by +10% to -.
It was set to overfeed within a range of 5%.

〔Example〕

An outline of an apparatus for carrying out the method of the present invention will be explained with reference to FIG. In FIG. 1, the supplied roving S is held by a pair of back rollers 17 and a pair of middle rollers 16 and is drafted by the difference in circumferential speed thereof, and is advanced by the running of a pair of aprons 18. front roller 1
0 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 is
Thread passage 4 and orifice 3 that separates the thread passage in the middle
, an outlet-side fluid jet port 2 that spouts a compressed fluid flow in a tangential direction with respect to the yarn passage, and an exit-side fluid jet port 2
and a fluid inlet 2 feeding the compressed fluid flow nozzle.
6. Consisting of a fluid reservoir 30. The fiber bundle fed by the front roller 10 has a yarn path 4.
When passing through, the threads are twisted in S and Z by the action of the compressed fluid flow and formed into a thread.After passing through the fluid nozzle 1, the thread is untwisted, gripped by a delivery roller 11, and sent out.

The basis of the fluid nozzle used in the present invention is already known from US Pat. No. 3,009,309. This known fluid nozzle is shown in Fig. 3a (longitudinal sectional view).
It is shown in Figures 3b and 3c (cross-sectional view). 1 is a fluid nozzle main body, and 2 is a jet port (hereinafter referred to as a fluid jet port) that jets out a compressed fluid stream. Here, the inlet side fluid jet port 2, the outlet side fluid jet port 2
The ejection direction is in the opposite direction. For example, if the inlet side fluid jet port 2 is in the S twist direction, the outlet side fluid jet port 2 is in the Z twist direction.

The method for manufacturing 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 fluid jet ports are shown, and the row of fluid jet ports is referred to as the inlet side fluid jet port 2, and the row of fluid jet ports is designated as the outlet side fluid jet port 2. Inlet side fluid spout 2
The ejecting direction of the outlet side fluid ejecting port 2 is opposite as shown in FIG. Reference numeral 3 designates an orifice installed between the inlet-side fluid jet port 2 and the outlet-side fluid jet port 2 of the fluid jet port group, and its role is to throttle the compressed fluid flow flowing out from the fluid jet port and change the direction of the flow. do. Here, how a compressed fluid flow flows in a fluid nozzle having a known reverse jet outlet (Fig. 5)
The flow of compressed fluid when the orifice of the present invention is provided (FIG. 6) will be compared. Let 6 be the trajectory of the compressed fluid flow coming out of the inlet side fluid jet port 2, and 7 be the trajectory of the compressed fluid flow coming out of the outlet side fluid jet port 2. In the case of the known nozzle shown in Fig. 5 (orifice 3
If there is no such flow), the swirling airflow 6 flowing along the pipe wall 9 of the yarn passage 4 collides with the swirling airflow 7, resulting in a turbulent flow and the flow rate in the longitudinal direction of the pipeway is significantly reduced. Therefore, the swirling ability of the compressed fluid is weakened, and even when the thread is passed through the thread passage 4, the number of revolutions thereof is significantly reduced. In this case, the number of rotations and the rotation direction of the thread are determined by the difference in the ejection force between the inlet-side fluid ejection port 2 and the outlet-side fluid ejection port 2, and the thread rotates in the direction of rotation of the one with the greater ejection force. 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 fluid outlet. On the other hand, when an orifice 3 is provided in the yarn passage (Fig. 6), the compressed air flow ejected from the inlet side fluid jet port 2 traces a swirling trajectory 6 along the pipe wall 9 of the yarn passage 4, but eventually the orifice 3 and collides with the shoulder 8 of the orifice 3, the swirling component of the airflow decreases, and most of the airflow becomes an axial flow that gradually diffuses approximately in the center of the thread passage 4 in the direction of thread travel. Proceed to. Therefore, this airflow 6
is in the opposite direction and does not interfere with the swirling airflow 7 flowing along the tube wall 9. In the case of the nozzle shown in FIG. 6 provided with the orifice 3 in this manner, 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, the yarn Y is falsely twisted in the Z direction in the sections and in the S direction in the sections.

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 shown in FIG. 7 is not performed. It performs a kind of single-chord vibrational turning motion as shown in Figure 9-a.

Next, the distribution state of the number of twists will be explained with reference to FIGS. 8 and 9.

Figure 8 shows a point where the nozzle has one fluid spout 2, as shown in Figure 8-a, and when there is no orifice at the nozzle end, the point where the thread touches the center line of the fluid jet, as shown in Figure 8-b. The number of twists reaches a maximum near point 14, and gradually decreases toward the front roller 10 and delivery roller 11 in a left-right asymmetrical manner before and after that. On the other hand, there are 8
- It was confirmed that when an orifice is installed as shown in Figure c, the way the twist is transmitted changes. In other words, as shown in Figure 8-d, the number of twists is prevented from attenuating on the twisting side (upstream side with respect to the progress of the yarn), and the twists are well transmitted to the upstream side, whereas untwisting On the side (downstream side with respect to the progress of the yarn), the number of twists rapidly decreases at the orifice portion, and 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 yarn, knots are created in the balloon and the length of the balloon is shortened, which increases the effect of twisting (or untwisting). It is thought that the phenomenon of frequent untwisting occurs.

In the present invention, by providing this orifice in the middle of the fluid jet ports in the forward and reverse directions, the above-mentioned S, Z
By focusing on two points: causing both rotations to occur in the yarn, and the above-mentioned special characteristics of twist propagation, they were able to invent a method for producing wrapped yarn with a novel structure by utilizing these two points. . In particular, in the present invention, in order to form the core of the wrapped yarn, a fiber bundle is fed to a single nozzle having fluid jet ports of compressed fluid jetted in mutually opposite directions, and the fiber bundle is twisted between the fluid jet ports. It is important to provide a differential force and to keep the yarn under tension during its passage through the nozzle.

How the core portion of the wrapped yarn is formed will be explained below.

The twist distribution using a nozzle for carrying out the method of the present invention will be explained with reference to FIG. Here, the rotation direction by the outlet side fluid jet port 2 is S twist, and the rotation direction by the inlet side fluid jet port 2 is Z twist. There is a difference in the rotational force between the two as described later. Fig. 9-b shows the twist distribution when the inlet side fluid jet port 2 and the outlet side fluid jet port 2 are operated independently.
It is drawn in correspondence with the positional relationship of each element in Figure 9-a. On the vertical axis, the S twist was set to + and the Z twist was set to -. Therefore, the twist distribution due to the inlet side fluid jet port 2 is represented on the - side, and the twist distribution due to the outlet side fluid jet port 2 is represented on the + side. In this case, the rotational force of the inlet-side fluid jet port 2 and the outlet-side fluid jet port 2 is adjusted so that the twist numbers S and Z of the jet port part (IO part) of the inlet-side fluid jet port 2 are almost equal. Adjust. The rotational force caused by this fluid jetting port is of course the rotating force of the thread due to the compressed fluid flowing out from the fluid jetting port.
It is determined by the inclination angle θ of the fluid jet port with respect to the nozzle axis, but it also changes depending on the length K of the thread exposed to this swirling airflow and the diameter D of the thread passage. Therefore, by appropriately determining these dimensions and pressures, it is possible to make the amounts of twist S and Z in both S and Z twist distributions in the IO section approximately equal. In this way, in order to equalize the amount of twist S and Z, there needs to be a difference in the rotational force (specifically expressed by the number of twists Z and S) at each jetting part, and in this example, the fluid jet on the exit side If the number of twists in the part O of the outlet 2 is S, then S>Z. The yarn actually passing through the yarn passage 4 has a twist distribution equal to the difference between the twist distribution due to the outlet side fluid jet port 2 and the twist distribution due to the inlet side fluid jet port 2. This is shown in FIG. 9c. The most important thing in FIG. 9c is that the number of twists is 0 or equal to 0 in the section a to d (the part where the inlet side fluid jet port 2 turns in the Z direction). If the S and Z twists are simply combined, it is possible for twist to appear in the section a-c, but in reality, the S twist is not twisted or is close to not twisted at the outlet side fluid jet port 2. Section c
Since it does not proceed forward beyond -d, it is thought that the section a-d will be in a non-twisted or nearly non-twisted state. Furthermore, it is not necessary that the twist in the section a to d is always completely zero. There is no problem in that S is slightly larger than Z 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 airflow 15. Hereinafter, this state of no twist or slight twist will be referred to as substantially no twist. Traditionally, twisted threads are supplied to a fluid disturbance area to defibrate the threads (Special Publication Act 1977-
28263) (Japanese Patent Publication No. 31-5976) is also known, but the present invention differs in that a fiber bundle that is essentially untwisted is supplied. Here, if the distance in section a-d is longer than the longest one of the fibers to be supplied, the yarn will be pulled out in section a-d where the yarn is substantially untwisted, that is, untwisted or close to untwisted. There is a higher chance of it breaking. Therefore, the distance is shorter than the maximum fiber length,
Furthermore, it is desirable that the fiber length be shorter than the average fiber length. The following phenomenon occurs in this section a to d where there is no substantial twisting.

A cross-sectional view of the yarn passage 4 at section c is shown in FIG. In FIG. 10, a compressed fluid flow 15 is ejected from the fluid ejection port 2 and collides with the rotating yarn bundle Y. In this time interval a-d, the yarn bundle is in a substantially untwisted state, so there is almost no cohesiveness between the fibers and the compressed fluid flow 1
5, the fibers are easily opened, split, and mixed together, and each single fiber or bundle of fibers that made up the yarn bundle is disrupted from its parallelism and rotated randomly. Twisting can be added to. To explain this situation in more detail, in FIG. 10, the compressed fluid stream 15 impinges on the yarn Y, which is shown at 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 pushes each fiber F away. The mutual positional relationship of the fibers can be changed by rotating the fibers. 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 the individual fibers 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. . 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 stream collides with the fiber bundle, which has become substantially untwisted in the c-d diagram, most of the loosened fibers will form loops and slack. etc., which disturbs the appearance of the threads that are later formed, loses the luster of the threads, and makes the surface rough.
It has low economic value. Further, the stress-elongation graph obtained by subjecting the yarn spun in such a relaxed state to a tensile tester is like 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, the front roller 10 and the delivery roller 11
The compressed fluid flow 15 is applied to the substantially untwisted yarn in the section a to d while keeping the gripped and progressing yarn Y in a tensioned state by limiting the ratio of the circumferential speed of the yarn Y to within a certain range. This allows fibers to be defibrated, mixed, and intertwined without forming loops or slacks. 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 set the circumferential speed of the front roller 10 to +10 from the circumferential speed of the delivery roller 11.
It was confirmed that setting the feed in the range of % to -5% is optimal. +10% here
In the overfeed of
As a result of the twisting, the yarn Y is twisted and shrunk, and the yarn in the c-d section is placed in a tensioned state. When acrylic Nm48 ^S was spun at a yarn speed of 660 m/min and the overfeed rate was +6%, the tension between c and d was 20 g/25 g. However, there is a limit to this twisting shrinkage, and the above overfeed rate
When it exceeds 10%, the stress-elongation curve of the yarn becomes as shown in A in Figure 10, confirming that loops and slack have occurred in the yarn. If the above-mentioned overfeed rate is -5% or less, the yarn in the section c-d, which is in a substantially untwisted state, can be easily drafted and pulled out, but due to incorrect drafting, yarn unevenness increases and at the same time, the yarn in the section c-d is in a substantially untwisted state. A situation arises in which fiber opening is inhibited, leading to a decrease in yarn strength. Therefore, the above-mentioned overfeed rate needs to be between +10% and -5%.

As described above, the wrapped yarn obtained by the present invention is subjected to the opening action of the compressed fluid flow under a constant tension state, so that no loops or slacks are formed in the core or on the outer surface, and the core is Since the fibers formed are intertwined, twisted, and mixed, their stress-elongation curve approximates that of ring yarn, as shown in FIG. 12B.

Defibration and entanglement of yarn by the method of the present invention described above,
The explanation of the twisting state and the tension state of the threads has clarified the process of forming the central core of the wrapped thread in the present invention and the structure of the core. 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. In order to make it easier to understand, in FIG.
6. A plan view of the apron 18 and 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 will be described later, two or more yarns have the effect of increasing the amount of surface fibers wound around the outer periphery of the wrapped yarn. Roving S is cross crawler 1
7, the front roller 1 moves forward while being drafted by the apron 18, and then rotates at high speed.
At 0, the fiber bundle 19 of one thread is grasped and pulled out. At this time, the roving fed to the front roller is completely or almost untwisted, and the parallelism is disturbed even by a slight airflow that collides with the roving.
A part of it protrudes out of the roving bundle in a fluffy manner.
On the other hand, since the front roller is rotating at high speed, a considerable amount of accompanying airflow flows around the front roller, and this airflow is generated near the nip line at the front roller 10.
Change the direction of flow in the axial direction. Therefore, just before the roving S is nipped by the front roller 10, the accompanying airflow causes the fiber ends to protrude, and some of the fibers protrude outside the roving S as the 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. These protruding ends O
The fiber bundle 19 containing the fibers is twisted when passing through the thread path of the nozzle 1, but as described above, this twist is substantially untwisted from the nip point a of the nip roller to the entrance d of the orifice 3, and then It has a twist distribution in the 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, the protruding end is the thread Y at the entrance d of the orifice 3.
Even after it is formed, it protrudes 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.
Most of the fiber bundles except zero will form the central core bundle. Therefore, in order to obtain sufficient surface-enveloped fibers, it is necessary to generate sufficient protruding edges;
In terms of supply and the number of rovings, two or more rovings are more advantageous than one.

On the other hand, if the jetting direction of the fluid jet port 2 on the outlet side is, for example, the S direction, then as can be seen from the explanation of the twist transmission diagram (Fig. 9), the direction of the twist propagating to the entrance d of the orifice 3 is the S direction. be. In the section a to d of FIG. 9, the fibers are substantially untwisted and exposed to the rotating airflow 15 in the Z direction, and the fibers are opened, mixed, etc. as described above. In addition, in the section a to 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, and Tighten in the direction. However, this winding is caused by air currents at most, so it is not strong and is only lightly rolled. In this way, the yarn Y, which is made up of a core bundle of cores and surface fibers entwined with protruding ends that are part of the core fibers, passes through the orifice 3 and is twisted in the S direction. is,
After reaching the point f where it is exposed to the compressed fluid from the outlet side fluid jet port 2, it is twisted back into a strong fissure. Therefore, at the point when the core has a twist distribution in the S direction (e or f), the surface enveloped fibers, which had been Z-twisted until then, become lightly twisted or untwisted, but this passes through point f and is twisted back to a strong fissure. When it is wrapped, a substantial Z-twist is applied, resulting in a tight winding around the core. In this way, surface short-circuited fibers are formed that are 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 twisted and intertwined with each other in an irregular manner along the longitudinal direction, and there are no loops or sag. Exists without. These entanglements and twists stably exist within the core because the core is firmly tightened by the surface envelope fibers.

The feed roving used in this invention need not be 100% staple fiber. The filament fiber bundle 22 can be fed to the front roller especially when you want to increase the strength, improve the properties of the yarn (for example, washability, wrinkle resistance, anti-shrinkage, etc.), or reduce yarn breakage. can. FIG. 1 shows this configuration. The filament fiber bundle 22 can 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. The filament fiber bundle is therefore being drafted by the supply roving S
It is desirable to feed it to the center of the (Figures 1 and 2)
If two rovings are to be supplied, they may be fed between the rovings, and if three or more rovings are to be supplied, they may be fed substantially at the center. Furthermore, in order to facilitate the opening in the section c-d, it is desirable to supply a filament fiber bundle that is untwisted or slightly twisted.

So far, we have described the case where there are one row of fluid jet ports on each side of the orifice 3 in opposite directions, but there may be three or more rows of fluid jet ports.

FIG. 13 shows a case where two rows of fluid jet ports are arranged on each side of the orifice 3. Number of rows of fluid jets,
The number may be asymmetrical with respect to the orifice. Further, the number of orifices is not limited to one, but may be plural. FIG. 14 shows a case in which three orifices are provided to divide the fluid ejection port group. Each fluid jet group is 2,2
, 2, 2, the jetting direction is alternately opposite for each fluid jetting port group. However, the jetting direction within one fluid jetting port group is constant. As described above, the rotational force due to the fluid jet port changes depending on the pressure at the inlet of the fluid jet port. Therefore, as shown in FIG. 15, the compressed fluid sources supplied to each group of fluid ejection ports are divided into groups, and compressed fluids with different pressures are supplied from separate compressed fluid sources to the fluid passages 261, 2.
62, the fluid may be supplied via the fluid reservoirs 28, 29.

In the present invention, a part of the yarn Y is made substantially untwisted, and the untwisted part is opened, entangled, and mixed by the action of compressed fluid, but this action is caused by the fact that the fluid flow starts from the middle. This can be achieved even more efficiently by shifting to a disturbed state. It has been confirmed through experiments that this effect can be strongly exerted by providing a compressed fluid flow outlet 27 just before the orifice (FIG. 15). This is because a part of the compressed fluid flow that had been swirling suddenly changes direction and is discharged, causing disturbance to the fibers. In addition, by spraying a compressed fluid stream onto such untwisted yarn, extremely short fibers, fiber lees, leaf lees, etc. contained in natural fibers etc. may separate from the yarn and accumulate at the orifice entrance, causing problems such as blocking the orifice. occurs, but this outlet 27
By providing the thread, the short fibers and the like are discharged together with the fluid, which avoids the above-mentioned troubles, and at the same time has the advantage that impurities such as leaf residue contained in the thread are removed, improving the quality of the thread. 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) to adjust the amount of exhaust gas passing through the waste port 27, or to change the cross-sectional area of the exhaust port depending on the yarn type, yarn 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 fluid jet port 21 and at the same time provides a gripping point for the fiber bundle, so that the fiber bundle can be easily held. It has the effect of converging and preventing the yarn from coming off in sections a to d.

Fibers that can be used in the present invention include all natural and synthetic staple fibers and continuous filament fibers. Natural fibers include, for example, cotton, wool, silk, ramie, flax, jute hemp, hemp, and synthetic fibers include polyester, polyamide, acrylic, cellulose fibers such as cellulose acetate, polyethylene, polypropylene, polyvinyl, and the like. In the present invention, the fluid that can be used in the compressed fluid nozzle includes any gas, but it is advantageous to use compressed air, which is readily available.

〔Effect of the invention〕

The usefulness of the present invention is listed below.

(1) Operation is fast.

According to this device, acrylic Nm48 ^S is bundled into yarn bundles.
It was possible to spin at 160m/min. Compared to the spinning speed of 8000 rpm of a ring spinning machine with the same count.
17 times more. In addition, by the method of the present invention, the blending rate is 50%.
When spinning a 50% cotton/ester blend yarn ( ^Nm60S ), the optimum spinning speed was 150 m/min. This is made using the same thread count on a ring spinning machine.
This corresponds to approximately 13 times the amount when spinning at 1000 rpm.

(2) Highly strong yarn 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 drawings]

FIG. 1 is a partially sectional side view showing the configuration of the entire apparatus for carrying out the method of the present invention, FIG. 2 is a plan view of the same, and FIG.
Fig. 3b is a cross-sectional view showing a known alternately twisted nozzle.
Figure 3c is a sectional view taken along JJ and KK in Figure 3a, respectively, Figure 4 is a sectional view of the nozzle of the present invention, Figure 5,
Fig. 6 is a diagram showing the airflow pattern of a known nozzle and a nozzle implementing the method of the present invention, respectively. Fig. 7 is a diagram showing the yarn swirling pattern of the same nozzle, and Figs. In the diagrams showing the twist distribution, FIG. 8 shows the case of a nozzle having one fluid ejection port, and FIG. 9 shows the case of a nozzle implementing the method of the present invention. Figure 10 is a diagram showing the pattern in which fiber bundles are entangled by fluid flow, Figure 11 is a diagram showing the entangled state of fibers, Figure 12 is a stress-elongation curve, and Figures 13, 14, and 15 are 1 shows cross-sectional views of embodiments of fluid nozzles implementing the method of the invention; FIG. 1...Fluid nozzle, 2...Fluid spout, 3...
Orifice, 10...Front roller, 11...
Delivery roller.

Claims (1)

[Claims] 1. Passing the fibers sent out from the front roller through a fluid nozzle having an inlet side fluid jet port and an outlet side fluid jet port whose fluid jetting directions are sequentially reversed in the longitudinal direction, and having an orifice between the two fluid jet ports, In the part of the outlet of the inlet side fluid outlet,
A jet stream is blown onto the fibers by adjusting the rotational force of both the fluid jet ports so that the number of twists applied to the fibers by the jets from the inlet-side fluid jet port and the exit-side fluid jet port are approximately equal. The wrapped yarn is characterized in that the fibers sprayed with the above are pulled out from a fluid nozzle by a delivery roller, and the circumferential speed ratio of the front roller and the delivery roller is set to overfeed in the range of +10% to -5%. manufacturing method.