JPS6336372B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for producing spun yarn.

In the history of spinning methods, ring spinning has been the mainstream since its appearance.

In recent years, innovative technologies such as open-end spinning, false twist spinning, and bundled spinning have been developed to dramatically increase spinning speed compared to ring spinning.

In the yarn obtained by the above ring spinning method, most of the fibers that make up the yarn are in a parallel state, and the yarn as a whole is rotated from one side to make a real twisted yarn, which is generally a single yarn called a single yarn. It has a structure. In addition, the yarn is twisted into a balloon of a certain size by the high-speed rotation of the traveler, and due to centrifugal force depending on the balloon diameter and rotation speed, both ends of the fibers are twisted with them protruding everywhere, resulting in fluff. Moreover, since the thread is squeezed with a traveler, fluffing is further promoted.

The rotor-type open-end spinning method is representative of the open-end spinning method, but this method twists the fibers that are being deposited in a state approximately parallel to the inner peripheral wall of a rotating rotor. Therefore, the core fibers are twisted strongly, and the fibers on the outer surface are not twisted all the way to the inside and are twisted lightly, like ring-spun yarn. The fibers cannot be twisted together in parallel.

Therefore, the fibers sprinkled at the end are called bridge fibers or wrap fibers that simply wrap around the outside of the yarn, and these fibers are not arranged in the twist direction of the yarn, but are entangled with the yarn like a wrapper. This not only damages the appearance of the yarn, but also causes a decrease in strength and fluff.

Furthermore, the false twist spinning method or the binding spinning method was developed by
56-79728, Japanese Patent Publication No. 52-43256, etc.

In other words, 80 to 90% of the main fibers constitute the main part of the yarn as bundles of parallel fibers, and by wrapping a very small number of fibers around the outside and giving up on the parallel fiber bundles, This is what gives yarn strength, and if you simply wrap staple fibers around a substantially untwisted parallel fiber bundle, the strength of the yarn will be weak, especially in the case of long fibers, but short fibers. Moreover, since the staple fibers are wrapped with unrestricted ends, this also causes fuzz.

The purpose of the present invention is to eliminate the drawbacks of the various spinning methods described above, and more specifically, to provide a method for producing spun yarn that is strong in yarn strength and has a smooth appearance with little fuzz.

The method of the present invention will be explained below along with an apparatus for carrying out the method.

In FIG. 1, a staple fiber bundle S is drafted to a specified thickness by a drafting device consisting of a back roller 1, a middle roller 2, and a front roller 3, and then passed through a first fluid vortex nozzle (N1: hereinafter referred to as the first nozzle). ) and a second fluid swirl nozzle (N2: hereinafter referred to as the second nozzle), the spun yarn Y is drawn out by a pull-out roller 4, and wound up by a winding device (not shown).

In each of the two nozzles N1 and N2, fluid jet ports are provided so as to generate swirling fluid flows in mutually opposite directions, and all gases can be used as the fluid, but they are difficult to obtain. Easy compressed air is sufficient.

In FIG. 2, the first nozzle N1 arranged in the twisting side region T between the nip point Q of the front roller 3 and the second nozzle N2 has constricted portions 5 at the inlet and outlet having a diameter smaller than the inner diameter of the nozzle chamber. , 6 are formed, and a rotary tube 7 is provided between the front roller 3 and the first nozzle N1.

The rotary tube 7 is the inlet throttle part 5 of the first nozzle N1.
The rotary tube 7 is rotatably supported via a bearing 8 on the outer circumferential surface of the rotary tube 7 in the same direction as the direction in which the yarn is wound by the first nozzle, and the rotation of the drive shaft 11 is transmitted to the rotary tube 7 via a belt 9, a pulley 10, etc. and rotate.

Note that the rotation axis of the rotary tube 7 is located on the same straight line as the central axis of the inner hole 12 of the first nozzle N1, and
Without interfering with the propagation of the false twist by the nozzle N2, the front roller 3 and the first nozzle N generated by the primary balloon B1 by the first nozzle N1
This does not prevent the generation of the secondary balloon B2 between 1 and 2.

Further, the rotational speed of the rotating tube 7 is set to an appropriate speed depending on the quality of the yarn to be spun, the yarn traveling speed, etc., but it is necessary that it not stand still, and it is sufficient that it rotates even a little. be. That is, the rotating tube 7 actively winds the fiber group S2 separated from the false twist of the fiber bundle S1 around the twisted fiber group in the center.

The yarn forming process in such a spinning device will be explained with reference to FIG. 3, which shows the process step by step.

That is, in FIG. 3, S is the first nozzle N1 and the second nozzle N2 from the nip point Q of the front roller 3.
The drafted staple fiber bundle supplied to the arrow B is the winding direction of the yarn balloon due to the winding flow of the first nozzle N1, and the arrow A is the swirling direction of the balloon in the second nozzle N2. The yarn winding directions of the two nozzles N2 are opposite, and in the case of the figure, the direction is such that S twist occurs in the twisting region T by the second nozzle N2.

4 is a pull-out roller.

Figure 3a shows the second nozzle N2 without running the thread.
The figure shows a state in which false twist is generated by twisting only, and the yarn in the twisted side region T has an S twist, and the yarn in the untwisted side region U has a Z twist.

b shows a state in which the yarn is run and false twist is generated at the second nozzle N2; in this case, the S twist generated on the twisting side T is sequentially untwisted by passing through the second nozzle N2.

Originally, the untwisted side should be untwisted, but in the pneumatic false twisting device like the above example, air is used to generate false twist, so there is no nip point for twisting, so the S on the twisting side is The twist is moving towards the untwisting side.

c is a state in which the first nozzle N1 is inserted between the front roller 3 and the second nozzle N2, and the fiber bundle S is sent out from the front roller 3 by the centrifugal force of the balloon generated by the nozzle N1. A portion of S2 is separated from the false twist to form an open end.

d and c show the state of the separated fiber S2 on the false twisted side, that is, the separated fiber S2 is placed on the twisted fiber bundle S1 in the direction of false twist (S twist) and in the opposite direction (Z twist). ) is relatively shallowly wrapped around it.

The state of the fiber S2 wound by e and d is shown on the untwisted side U of the false twist, and when the fiber S2 wrapped in the Z twist in the opposite direction to the S twist of the false twist enters the untwisted side region, It is further twisted in the Z direction by the untwisting action.

f Therefore, the yarn Y that has passed through the pull-out roller 4 becomes a spun yarn having a Z-twist actual twist, and is transferred to the winding device.

In the method of the present invention, the steps c to f described above are c→d→
The thread is manufactured by passing through the threads in the order of e→f.

In the yarn forming step d, some of the fibers S2 separated from the false twist are wrapped around the twisted fibers S1 by the yarn balloon. A rotating tube 7 is disposed in between, and the rotating tube 7 is actively rotated in the same direction as the balloon direction of the yarn by the first nozzle N1, so that the fibers S2 separated from the fiber bundle S are actively rotated. In other words, it is possible to wrap the twisted fiber bundle S1 not only by the swirling force of the balloon, but also by applying a swirling force other than the balloon after the action of the balloon has been applied. The spun yarn has a strong Z twist, is strong, has little fuzz, and has a smooth appearance.

Note that P1 and P2 in d and e indicate the winding pitch of the wound fiber S2 at each position, and P1>P2.

Furthermore, if the amount of fibers separated from the false twist is too small, sufficient strength will not be obtained, and if it is too large, yarn breakage will occur, so it is necessary to control the amount to an appropriate amount.

In this embodiment, the amount of separated fibers can be controlled by controlling the air pressure of the first nozzle and the second nozzle and adjusting the number of rotations of the yarn balloon.

For example, if the number of rotations of the yarn balloon by the first nozzle N1 is n1, and the number of rotations of the yarn balloon by the second nozzle N2 is n2, the air pressure is set so that n1<n2.

As described above, a part of the fiber bundle sent out from the front roller 3 is separated from the false twist between the front roller 3 and the first nozzle N1, but at this time, the tip side S20 of the fiber is separated as shown in FIG. The fibers are then wound around the false-twisted fiber bundle S1 in a direction opposite to the false-twisting direction, but the rear end side S21 of the separated fibers ends up being twisted into the false-twisted fiber bundle.

Therefore, after passing through the second nozzle N2, the front end of the separated fibers is further twisted in the winding direction, that is, in the Z direction in the case of the above embodiment, by the untwisting action, and the rear end is untwisted. The fibers become mixed in the uncut fiber bundle S1, resulting in a thread structure as shown in FIG.

That is, the spun yarn Y obtained in this way has directionality, and when rubbed in the direction of arrow c, the wrapped fibers S2 shift and form a nip-like shape, and the binding force decreases and becomes loose and cut. There is a risk that
When rubbed in the direction of arrow D, it is very strong, several times stronger than ring thread, and the thread has less neps in appearance.

As described above, in the present invention, the degree of wrapping of the separated fibers around the outer periphery of the heated fiber bundle is much deeper than in the conventional method using only the swirling force of the balloon, so the yarn strength is increased. Moreover, it is possible to obtain a smooth spun yarn with less fuzz in terms of appearance.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a pneumatic spinning device;
Fig. 2 is an enlarged cross-sectional view of the main parts of a spinning apparatus for carrying out the present invention, Fig. 3 is a principle diagram explaining the process of forming spun yarn produced by the method of the present invention, and Fig. 4 is a diagram of separated fibers. FIG. 5 is a schematic diagram showing the wound state, and FIG. 5 is a schematic diagram showing the structure of the manufactured thread. 3...Front roller, 7...Rotating tube, N1...
...First fluid swirl nozzle, N2... Second fluid swirl nozzle, S... Staple fiber bundle, S1... Twisted fiber bundle, S2... Fiber separated from false twist.

Claims (1)

[Claims] 1 A spinning method for obtaining a spun yarn by applying a first fluid vortex nozzle and a second fluid vortex nozzle that generates a fluid flow in a direction opposite to the fluid swirling direction of the first fluid vortex nozzle on a staple fiber bundle; On the twisting side of the second fluid vortex nozzle and between the front roller and the first fluid vortex nozzle, the centrifugal force of the balloon generated by the first fluid vortex nozzle causes the balloon to be released from the front roller. Immediately after this, the outer fibers are separated from the staple fiber bundle, and are wound around the twisted fiber bundle by the swirling force of the balloon, and further, when entering the first fluid vortex nozzle, the outer fibers are separated from the staple fiber bundle by the swirling force of the balloon. is a spun yarn characterized in that by applying another swirling force, the outer circumferentially wrapped fibers that have been shallowly wrapped around the twisted fiber bundle are wound more deeply in the same winding direction by the swirling force of the balloon. Production method.