JPS6399332A - Production of covered yarn - Google Patents

Abstract

PURPOSE:To produce a covered yarn at a high speed, by passing a blended fiber bundle of a staple fiber and a continuous filament fiber through a specific fluid nozzle and firmly winding a part of a core-constituting fiber around the outer circumference of a core bundle having interlocking free from loosening of loop. CONSTITUTION:A supplied roving S is drawn and a fiber bundle is supplied by a front roller 10 toward the axis of a fluid nozzle 1. The fluid nozzle 1 is provided with an orifice 3, fluid ejection nozzles 2I and 2II, a fluid inlet port 26, a fluid reservoir 30 and a yarn path 4 and applies a yarn with S and Z twist by the action of compressed fluid. The peripheral speed ratio of the front roller 10 to the delivery roller 11 is controlled to effect over-feeding within the range of +10%--5%.

Description

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

(Prior art) In the present invention, a wrapped yarn refers to a yarn composed of m fiber bundles as a core existing inside the yarn and a group of fibers surrounding it. Although it is manufactured using the so-called air spinning method, 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.

Typical examples of such conventional wrapped yarns and their manufacturing methods are Japanese Patent Publication No. 43-28250 or Japanese Patent Publication No. 49-383.
82 are known. The wrapped yarn specified in Japanese Patent Publication No. 43-28250 is ``Fact 1. A bundle of true untwisted cores and fibers of the core formed in irregular spirals with various angles within the range of 10° to 80°. 1lIi miscellaneous core of virtually continuous textiles interconnected in tight bundles characterized by a surface envelope with a significant true twist imparted by surface fibers tightly twisted around the bundles of Spun yarn containing
It is. Here, what is meant by a virtually true untwisted core bundle is that when a ribbon-like fiber bundle is taken from the drafting Hfff by a 7 subilator and fed to a torque jet, as shown in Fig. Consisting of most of the core fibers, which are twisted in the same way as the strands, and a small amount of surface fibers, which are twisted to a lesser degree, when this a-bound bundle passes through the center line of the torque jet, it becomes normal. It is obtained by rotating the core fibers so that they are completely untwisted, as in the pseudo-twisting method, and the core fiber bundles are simply heated and untwisted without any disturbance, resulting in parallel fiber bundles. It exists as a fiber bundle consisting of fibers.

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 that are tightly twisted around the core bundle. On the other hand, in the case of a general ring yarn, all 41 fibers in the system "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 m As the fibers rotate around each other, strong yarn strength is generated due to the frictional resistance between the fibers. Therefore, the Tokuko Sho 4
In the case of the wrapped yarn specified in No. 3-28250, 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, such a yarn can only be made strong by the surface fibers that are tightly wound around its outer periphery, so if you want to increase the strength, you will have to increase the number of fibers, which will cause the yarn surface to harden and become stiff. It is only possible to make a cloth that feels good to the touch, and if the amount of hard surface fibers is reduced, it becomes a thread that can be pulled out by a slight tensile force, so it has not yet been put into practical use.

On the other hand, in Japanese Patent Publication No. 49-38382, by treating a composite with a turbulent fluid flow, the fibers constituting the composite yarn are entangled with each other, and the short fibers create loops and sag.
A method for producing a no-twist spun yarn is disclosed, which is characterized in that after imparting fluff, the fluff protruding from the yarn surface is wound around the outer periphery of the eye. However, for general textiles9
When it comes to yarn for knitting, the beauty and uniformity of the yarn surface is the most important requirement, and the presence of loops, slack, etc. in the yarn is something that should be avoided as it will impair the appearance of the fabric. If there are loops or slack in the yarn, the thread will inevitably be weak and cannot withstand the knitting and weaving process.

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 by mixing staple sN or stable an with filament IIH, and is made of m fibers consisting of each fiber or several fibers constituting the central core. The bundles are heated and intertwined with each other in an irregular manner along the longitudinal direction of the yarn, and the core is substantially untwisted and exists in a parallel state. “Beibuito”
Unlike the core, the lIi 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.
It will become even more powerful as it tightens its grip on the city.

Moreover, in the wrapped yarn according to the present invention,
Unlike the wrapped yarn shown in No. 382, each of the m fibers 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 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.

Means for Solving Problem C] J! according to the present invention! The method for producing wrapped yarn is to combine a fiber bundle made of a mixture of stable fibers and continuous filament fibers into a single fiber bundle having alternating ejection directions S and Z and having a plurality of ejection ports for compressed fluid streams with different rotational forces. By introducing and passing through a fluid nozzle, rotation, heating untwisting, tensioning, and wrapping are simultaneously caused in the bound bundle, and the core is formed around the outer periphery of the bundle of cores having entangled loops without slack. It is made by tightly winding a part of fibers, and has an inlet side fluid jet port and an outlet side fluid jet port whose jetting directions are sequentially reversed in the longitudinal direction, and both the fibers sent out from the front roller are The number of twists applied to the 4I fibers by the jets from the inlet fluid outlet and the outlet side fluid outlet is passed through a fluid nozzle having an orifice between the fluid outlets, and the number of twists applied to the 4I fiber by the jets from the inlet fluid outlet and the outlet side fluid outlet is A jet stream is blown onto the fibers by adjusting the rotational force of both the fluid jet ports so that the shift is approximately equal, and the S fibers blown with the jet stream are pulled out from the fluid nozzle by a delivery roller, and the front roller and the delivery roller are connected to each other. The circumferential speed ratio was set to overfeed in the range of +10% to -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. The front roller 10 rotates at a high speed, pulls out one fiber bundle from the advancing AT fiber bundle, and supplies the 4I fiber bundle toward the axis of the fluid nozzle 1. Fluid nozzle 1
, a yarn passage 4, an orifice 3 that divides the yarn passage in the middle, and an inlet-side fluid jet port 21 that spouts a compressed fluid flow in a tangential direction to the yarn passage. Fluid inlet 26 for supplying the outlet side fluid spout 2■ and the compressed fluid flow nozzle. It consists of a fluid reservoir section 30. The fiber bundle fed by the front roller 10 has S when passing through the yarn path 4 due to the action of the compressed fluid flow.
After being twisted by Z and Z, the yarn is formed into a yarn, passed through a fluid nozzle 1, 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 (II sectional view), Fig. 3b, and Fig. 3C (transverse 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 ejection directions of the inlet side fluid ejection port 2I and the outlet side fluid ejection port 2■ are opposite to each other. For example, if the two fluid jet ports on the inlet side are in the S twist direction, the two fluid jet ports on the outlet side are 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, one row of fluid jets showing a group of fluid jets is connected to the inlet side fluid jet 2.
The fluid jet ports in the I and It rows are referred to as outlet side fluid jet ports 2■. The ejection directions of the two fluid ejection ports on the inlet side and the two fluid ejection ports on the outlet side are opposite as shown in FIG. 3 is an orifice provided between the inlet-side fluid jet port 2I 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, 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 trajectory of the compressed fluid flow from the two fluid jet ports on the inlet side is shown in 6.
Let 7 be the locus 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 (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, resulting in a turbulent flow and the flow rate in the longitudinal direction of the pipe is significantly reduced. do. 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 rotational speed of the thread per rotation direction is determined by the difference in ejection force between the inlet side fluid ejection port 22 and the outlet side fluid ejection port 22, 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 a reduction in the rotational speed of the thread compared to a nozzle with a unidirectional fluid outlet. On the other hand, when the orifice 3 is provided in the yarn passage (Fig. 6), the compressed air flow ejected from the inlet side fluid jet port 2■ stays on the tube wall 9■ of the yarn passage 4 and draws a swirling trajectory 6. Eventually, the airflow is 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 airflow becomes an axial flow that gradually spreads around the center of the thread path 4, spreading the thread. Proceed in the direction of travel. 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 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, the yarn Y is false-twisted in two directions in section (2), 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 shown in FIG. 7 is not performed. 9
A kind of single-chord vibrational turning motion is performed as shown in Fig.-a.

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

Fig. 8 shows a case where the nozzle has one fluid ejection port 2, and as shown in Fig. 8-a, when there is no orifice at the nozzle end, the
As shown in Figure 1-b, the number of twists is maximum near the point 14 where the center line of the fluid jet port and the yarn touch, and then gradually decreases before and after that asymmetrically toward the front roller 10° and the delivery roller 11.

On the other hand, it has been confirmed that when orifices are provided before and after the fluid ejection port 2 of the nozzle as shown in FIG. 8-c, the way the twist is conducted changes. In other words, as shown in Figure 8-d, on the heating side (upstream side with respect to the progress of the yarn), the number of twists is prevented from attenuating, 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 yarn, knots are created in the balloon and the length of the balloon is shortened, which increases the heating (or untwisting) effect.The upstream side is well heated and the downstream side is well heated. It is thought that the phenomenon of untwisting is occurring.

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 can be achieved.

2. Making both rotations occur in the thread, and (1) the above-mentioned special characteristics of the twisted dencho.By taking advantage of these two points, we have invented a method for manufacturing wrapped thread with a novel structure. It was. In particular, in the present invention, in order to form the core of the wrapped yarn, Ili fibers are bound and fed to a single nozzle having fluid jet ports of compressed fluid jetted in opposite directions to each other, and the heating force between the fluid 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 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 22 is S twist, and the rotation direction by the inlet side fluid jet port 2I is defined as 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 2I and the outlet-side fluid jet port 2■ are operated independently, corresponding to the positional relationship of each element in Fig. 9-a. It is a drawing. On the vertical axis, I took S twist and 2 twists in -. Therefore, the twist distribution due to the two fluid jet ports on the inlet side is represented on one side, and the twist distribution due to the two fluid jet ports on the outlet side is represented on the + side. In this case, the rotation by the inlet side fluid jet port 2I and the outlet side fluid jet port 2■ is made so that the number of twists SI and ZI of the jet port part (10 parts) of the two fluid jet ports on the inlet side are almost equal. Adjust the force. The rotational force due to 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, and the diameter, shape, and shape of the fluid jetting port, 11! l number.

It is determined by the fluid pressure at the fluid jet port and the inlet 13, and 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 of the thread path. It is something to do. Therefore, by appropriately determining these dimensions and pressures, it is possible to make the ISI and ZI of the twists in both the S and z twist distributions in (10 parts) substantially equal. Twist like thisff
In order to equalize 1sI and ZI, there must be a difference in the rotational force (specifically expressed by the number of twists ZI and SII) at each jetting part, and in this example, the fluid jetting port 2 on the outlet side
Let S be the number of twists at the spout outlet part ■O, then S
II>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 outlet side fluid jet port 22 and the twist distribution due to the inlet side fluid jet port 22. 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-d (the part where the inlet-side fluid jet nozzle 2 is turned in the Z direction). If the S and Z twists are simply combined, it is possible for the section a-C to show twist, but in reality, the S twist is not twisted or is close to not twisted at the outlet side fluid jet port 2■. Therefore, it is considered that the sections a to d are in a non-twisted state or almost a non-twisted state because the fibers do not proceed forward beyond the section c-d.

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 airflow 15. Hereinafter, this state of no twist or slight twist will be referred to as substantially no twist. Traditionally, twisted yarn is supplied to a fluid disturbance area to defibrate the yarn (Special Publication No. 43-28263> (Special 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 l of the interval a-d
If the length of the yarn is longer than the longest of the fibers supplied, there is a high probability that the yarn will be pulled out and broken in the section a to d where the yarn is substantially untwisted, ie, untwisted or close to untwisted. Therefore, it is desirable that the distance is 1.1 times longer than the maximum fiber length and further shorter than the average machine length. The following phenomenon occurs in this section a to d in which there is substantially no twisting.

A cross-sectional view of the yarn passage 4 at part 0 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. 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, separated, and mixed by the collision of the compressed fluid flow 15, and the fibers are Each single fiber or bundle of fibers that made up the bundle is disrupted from its parallelism and at the same time is rotated and randomly twisted. To explain this state in more detail, FIG. 10 shows the compressed fluid flow 15
collides with yarn Y indicated by 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 moving the focusing force, and the compressed fluid flow 15 flows between the fibers and displaces or rotates each mMF. The mutual positional relationship of am can be changed by

Of course, not all fibers are completely separated, but there are cases where two or three fibers cluster together and rotate or change position. This rubbing state continues from section C to d, and each fiber bundle 11 that constitutes the fiber bundle corresponding to the center core of the yarn bundle
11F or these bundles are entangled with each other and twisted to form a state as shown in FIG. 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, it will become virtually untwisted as shown in diagram c-d.
When the compressed fluid flow impinges on the bundle, most of the loose fibers become loops, slacks, etc., which disturbs the appearance of the yarn that will be formed later, and makes the yarn dull and its surface rough, making it economical. It becomes of low 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 yarn Y gripped and progressing between them is kept in a tensioned state, and the yarn Y is substantially S-twisted in the section a to d. compressed fluid flow 1 to the yarn of
5 to defibrate and mix the threads without forming loops or slack.

It provides entanglement. 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 has confirmed that it is optimal to set the circumferential speed of the front roller 10 in a range of +10% to -5% of the circumferential speed of the delivery roller 11. Here, with an overfeed of +10%, the yarn Y will theoretically be relaxed between both rollers, but in reality, the yarn Y will twist and shrink due to the heating by nozzle 1, and the yarn in the C-d section will be be placed in a state of tension.

c- when acrylic t4n+48" is spun at a yarn speed of 16011/lin and the overfeed rate is +6%
The tension between d was 20g/25g. However, there is a limit to this twisting shrinkage, and the above overfeed rate is 1
When it exceeds 0%, the yarn stress elongation curve becomes as shown in A in Figure 10, and it is confirmed that loops and slack have occurred in the yarn. If the above-mentioned overfeed rate is 15% or less, the yarn in the section c-d, which is in a substantially untwisted state, can be easily drafted and removed, but due to incorrect drafting, yarn unevenness becomes large and at the same time, the yarn in the section c-d is in a substantially untwisted state. A situation occurs in which fiber opening at step d is inhibited, resulting in a decrease in yarn strength. Therefore, it is necessary that the overfeed rate is 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 condition as described above, so that the wrapped yarn has loops,
Since no slack is formed in the core or on the outer surface, and the fibers forming the core are intertwined, twisted, and mixed, the curl elongation curve is similar to that of a ring yarn, and the curve is 8 in Figure 12. It becomes a ball.

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 yarn has clarified the process of forming the central core of the wrapped yarn in the present invention and the formation of that 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. The first part is an overall diagram for easy understanding.
In the figure, the back roller 17 of the draft device. Middle roller 16. Apron18. 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 it may be two or more. However, as will be described later, the use of two or more yarns has the effect of increasing the number of surface fibers wound around the outer periphery of the wrapped yarn. The roving S is fed to the back roller 17 and then to the apron 18.
The yarn moves forward while being drafted by the front row 510, which rotates at high speed, and is then gripped and pulled out as a fiber bundle 19 for one yarn. At this time, the roving fed to the front row is completely or almost untwisted, and the parallelism is disturbed by the slight airflow that collides with the roving, and a part of it is fluffed outside the roving bundle. stand out. 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, 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. Projecting end 2
0 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 has a twist distribution in the IIS direction. In this way, the van bundle 19 is connected to the orifice 3.
The threads are twisted at the entrance d to become Ishun thread Y. 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 the surface wrap Ir81a fibers that are wound around the outer periphery of the wrapped yarn of the present invention, and most of the S strands excluding the protruding ends 20 form a bundle of central cores. Become. 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.

-Force ratio If the spouting direction of the fluid spout 2 on the side of the mouth is, for example, the S direction, then as can be seen from the explanation of the twist chain diagram (Figure 9), the direction of the twist is transmitted to the inlet d of the orifice 3. is S
It is the direction. In the section a to d of FIG. 9, the fibers are opened in a substantially untwisted state and exposed to the rotating airflow 15 in the Z direction, and are opened, mixed, etc. as described above. In addition, in the section a-d, the I fiber ends that had been present in the yarn core are exposed to the compressed fluid flow 15, and some of them are blown out of the yarn bundle and become the above-mentioned protruding ends 20. Projects out of the yarn bundle as a protruding end similar to . In this ball, 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 the protruding ends 20 around the yarn core are 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 the core bundle of cores and the surface fibers entwined with the protruding ends of some of the fibers that make up the core, passes through the orifice 3 and is twisted in the S direction. and the outlet side fluid jet port 2
After reaching the point f where it is exposed to the compressed fluid from (1), it is violently untwisted. Therefore, at the point when the core has a twist distribution in the S direction (e or f), the surface envelope lJ, which had been 7 twists,
The i fibers become lightly twisted or untwisted, but when they pass through point f and are strongly untwisted, they are effectively twisted by 7 twists and wound tightly around the core. In this way, a surface envelope fiber is formed that is wound around the outer periphery of the core.

Even after some core parts are untwisted, the single fibers or bundles of several fibers that make up the core are heated and intertwined with each other in an irregular manner along the longitudinal direction, and the fibers form a loop. , exists in a state with no slack. 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. Especially when you want to increase the strength, the characteristics of the thread (
For example, the filament fiber bundle 22 can be supplied to the front roller when it is desired to improve the washability, IUA property, anti-shrinkage property, etc., or when it is desired to reduce yarn breakage. 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 included in 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 the opening in the section c-d, it is desirable to supply the filament fiber bundle with no twist or a slight twist.

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

FIG. 13 shows a case where fluid jet ports are arranged in one row on each side of the orifice 3. The nine rows of fluid 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 in which two orifices are provided to divide the fluid ejection port group. Each fluid outlet group is 2I
, 211.2T[[, 21V, 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 fluid ejection port group are divided into groups, and compressed fluids with different pressures are released from separate compressed fluid sources. 262, the fluid may be supplied via 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. By spraying a stream of compressed fluid onto a twisted, untwisted thread, very short fibers and fiber lees contained in natural fibers are separated from the thread and deposited at the orifice entrance, blocking the orifice. However, by providing this discharge port 27, the short δ2 fibers etc. are discharged from there together with the fluid, and at the same time, the above trouble is avoided, and at the same time, impurities such as axes contained in the yarn are removed. Another advantage is that the quality of the yarn is improved. 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, the waste port 27
It is desirable to provide a valve (not shown) to adjust the amount of exhaust gas passing through the yarn, or to change the cross-sectional area of the exhaust port depending on the type of yarn, number 1, etc.

As shown by the dotted line in FIG. 4 (providing the orifice 12 at the entrance 5 of the yarn passage 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 41i miscellaneous bundle, the fiber bundle This has the effect of preventing the thread from being pulled out or broken in the section a to d.

The vine fibers used in the present invention include all natural and synthetic staple fibers and continuous filament fibers. Examples of natural fibers are cotton and wool.

Synthetic fibers include silk, ramie, flax, jute, and hemp, and synthetic fibers include polyester, polyamide, acrylic, cellulose fibers such as cellulose acetate, polyethylene, polypropylene, and polyvinyl.

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 N148 yarn bundle is 160m long.
/min. This is 17 times the spinning speed of a ring spinning frame with the same number of rotations of 8,000 rpm. Further, when a blended yarn (Nm60) of cotton and ester with a blending ratio of 50% to 50% was spun by the method of the present invention, the optimum spinning speed was 150n+/In1n. This is approximately 13 times as much as when spinning yarn of the same count with a ring spinning machine at 1,000 rpm.

(2) A yarn with high strength can be obtained.

This wrapped yarn has a structure in which the MAH constituting the central core migrates and is 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 thread 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.

The cake lees, 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 apparatus for carrying out the method of the present invention, Fig. 2 is a plan view thereof, Fig. 3a is a sectional view showing a known alternately twisted nozzle, and Figs. 3b and 3C. Figure 3a
4 is a sectional view of the nozzle of the present invention, and FIG. 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. Figure 8 is a diagram showing the twist distribution.
The figure shows the case of a nozzle implementing the method of the invention. 10th
The figure shows the pattern in which fiber bundles become entangled due to fluid flow.
Fig. 1 shows the intertwined state of the a-fibers, Fig. 12 shows the stress elongation curve, and Figs. 13, 14, and 15 show cross-sectional views of each example of a fluid nozzle that implements the method of the present invention. . 1...Fluid nozzle, 2...Fluid spout. 3... Orifice, 10... Front roller. 11...Delivery roller

Claims (1)

[Claims] Passing the fibers sent out from the front roller through a fluid nozzle having an inlet side fluid jetting port and an exit side fluid jetting port whose fluid jetting directions are sequentially reversed in the longitudinal direction, and having an orifice between both the fluid jetting ports, At the outlet of the inlet-side fluid outlet, the rotational force of both fluid outlets is adjusted so that the number of twists applied to the fibers by the jets from the inlet-side fluid outlet and the outlet-side fluid outlet are approximately equal. the fibers are blown with a jet stream, the fibers blown with 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 +
A method for manufacturing a wrapped yarn, characterized in that the overfeed is set in a range of 10% to -5%.