JPS599225A - Nozzle for bind-spinning - Google Patents

Abstract

PURPOSE:The titled nozzle in which the pressure reduction chamber of a larger diameter is concentrically connected to the upper-stream side of the twisting tube and the slit tube is concentrically set in the pressure reduction chamber, thereby the yarn bundle is made to run at an opened state through the air turbulence zone to ensure the binding effect. CONSTITUTION:The pressure reduction chamber 5 is concentrically connected to the upper-stream side of the twisting tube 3 and the slit tube 6 is concentrically set so that the tube has a through slit on the surface as the path for binding yarn. The fiber bundle 1 is once opened all over the peripheral surface at the inlet of the false twisting nozzle and made to run into the turbulence zone at this state so that the surface fibers ensure an effective binding of the yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in air false twist nozzles used in bundle spinning.

In binding spinning, a fiber bundle spun from a draft mechanism is sucked into a false twisting nozzle, heated, and untwisted, and a binding yarn is formed by the difference in twist between the inner and outer layer fibers that occurs at this time. Heating is performed by a vortex flow generated by an air jet tangentially to the fiber bundle passage in a large diameter hole provided in the rear half of the nozzle, and in order to obtain a good binding effect, K reaches the vortex area. It is desirable that there be a large number of fibers with free ends protruding from the surface of the previous fiber bundle, and these free end fibers will wrap around the core fiber bundle in the untwisting acid after passing through the vortex region, creating a binding effect and making it strong. A binding thread is obtained.

For this purpose, for example, JP-A-50-160533
In the publication, a reduced pressure area for spreading the fiber bundle is provided at the entrance of the false twisting nozzle, and then a spiral friction body is provided, and the fiber bundle is first spread by the edge fibers being sucked into the reduced pressure area, and then subjected to friction. It slides along the body and advances to the vortex region, maintaining its expansion while receiving false twist. However, in this method, the surface #1 fiber end, which has been expanded once at the 4° entrance, tends to be wrapped around the core as the thread rotates while traveling on the friction body. The expansion effect will be diminished.

The present invention has been made in view of the problems of the prior art.The present invention has been made in view of the problems of the prior art. The object of the present invention is to provide a device that secures an effective bundling effect by surface fibers, does not require energy such as newly introduced air to expand the fiber bundle, and is easy to maintain. purpose.

That is, the present invention provides a false twist nozzle for bound spinning that includes a heating tube equipped with an air vortex generating means.
A large-diameter vacuum tube is concentrically connected to the fiber bundle, and a slit tube with holes perforated on the circumference is provided concentrically within the vacuum chamber as a fiber bundle ifi path, thereby expanding the fiber bundle. This is a false twisting nozzle for bundled spinning, which is characterized in that the false twisting nozzle is caused to advance into a vortex region in a state in which the air is twisted.

The present invention will be explained in more detail below based on the drawings.

In the embodiment of the invention shown in FIG. 1, the false-twisting nozzle comprises an introduction part 2 and a cough tube 3 arranged concentrically along the traveling direction of the fiber bundle 1. .

The introduction section 2 consists of a relatively small diameter inlet 4 and a large diameter decompression chamber 5 following the inlet, and an insert 6 such as a small diameter pipe is inserted into the inlet 4 so as to protrude into the upper chamber 5. The fiber bundle path is formed by a fiber bundle passage, and the tip thereof is a free end. Insert 6 fd As shown in Figure 2, it is a slotted pipe with a slit 7 penetrating its peripheral wall, and the slit 7! The interior of the chamber is in communication with the decompression chamber.

f) The 11 friction pipe 3 has a small diameter constriction part 9 bored in the female medium heat on the side of the introduction part 2, and faces the open end of the insert 6 closely, and the lower part Il/Itfill has a large diameter constriction part 9. Vortex chamber 1
It is 0. In the vortex flow chamber 10, 17-line direction with respect to the fiber bundle passage at the axis of the peak, and the progress tJ of the fiber bundle.
Is the air injection hole II tilted in the direction of parallel movement heating up? 1〒
8, the injection hole] 1 further includes an air storage chamber 12.
It is connected to a high-pressure air source.

The fiber bundle I is first spun into a non-twisted ribbon from a draft device (not shown) and introduced into the inlet of the insert 6 by a suction flow generated by a vortex flow in the heating tube 8. The inside of the introduction section 2 is a large-diameter decompression chamber 5, so there is f! inside the insert 6. A part of the air sucked together with the '7110 bundle 1 accompanies the progress of the t-curvature fiber bundle and blows out from the tip of the inyard 6, but a part of it is blown out from the tip of the inyard 6.
At that time, the surface fibers forming one fiber bundle ride on the diffused airflow 1 and are pulled outward and become expanded.
9 and is sent to the vortex chamber 10 without continuous flow,
The fuel 11 is twisted by the vortex of the shaft formed by the air m11 injected from the air injection hole 11.The combustion also extends to the 54 bundles 1 in the upstream inner chamber. However, as mentioned above: 1fflυ, since the surface fiber is pulled outward, this fiber rotates with the core,
It's rare to get confused by this. This phenomenon creates a substantial difference in the number of twists between the fibers on the surface side and the tying cord in the core, and when untwisting the false twist, the surface fibers wrap around the core and restrain it, making it difficult to connect with the binding yarn. In the present invention, the fibers and string bundles passing through the insert section are not pressed against the tube wall, and the entire surface of the fiber bundle advances in a state that is favorable for the derivation of fiber ends. On the other hand, since all the members constituting the fiber bundle passage are arranged concentrically and substantially in a straight line, the twist propagates to the nozzle inlet and sufficiently heats the core fibers. Therefore, the surface fibers with a free end of the front Ml'' reach the heating tube with one end fixed to the core, and there is no scattering during running, and the two surface portions are separated by the 1&pull from the slit. Favorable binding effects, such as prevention of heating, improve the strength of the yarn.

As for the structure of the insert 6, as shown in FIG. 2, the slit 7 is provided in a part of the entire length of the peripheral wall along the longitudinal direction of the insert.In addition, as shown in FIG. It may be completely open until the end. According to this type of insert, some of the surface fibers are drawn out from the slit 7 to the decompression chamber 5 due to the suction force, and because the slit 7 is missing in the middle, the surface fibers cannot be expanded, and are again converged with the heated fiber bundle. This is advantageous because it can be allowed to proceed to the heating tube without any damage. Further, depending on the spinning conditions, the same effect can be achieved even if a large number of perforations are provided instead of slits.

It is preferable that the number of slits 7 is 2 to 4 evenly distributed on the peripheral wall of the insert, and if the number of slits is large, the groove 11 should be narrow, and if there is a small number of slits, the groove 11 should be widened. According to experiments conducted by the present inventors, the groove width of the slit 7 is 0.3, although it depends on the inner diameter of the insert.
A range of 1 m%, particularly 0.4 to 0.6 m%, is preferred. Although the slits are generally arranged parallel to the axis as in the illustrated embodiment, they may also be arranged in a spiral or spiral shape. 4
In the case of holes, it is preferable that the holes be arranged in any desired manner, such as parallel to the axis, spirally, staggered, etc., evenly over the entire circumference of the insert.

The insert 6 may be manufactured integrally with the introduction part 2, but as in the illustrated embodiment, it may be manufactured separately from the nozzle body.
A device that can be inserted and assembled later is preferable from the viewpoint of maintenance and manufacturing. That is, since the insert frequently comes into contact with the fiber bundle, there is a high chance that the insert will wear out, and should be replaced or repaired at the appropriate time. Therefore, as a material, U1 quality lTi
It goes without saying that abrasive material #4 is desirable, but an appropriate material should be selected based on the balance between life and cost.

The constriction part 9 has two functions: to prevent the air flow from flowing backward from the swirl chamber 10, and to function as a fulcrum to effectively heat the fiber bundle within the swirl chamber 10. Particular emphasis is placed on the former effect. Yes, reverse b11. There is no problem in omitting it under spinning conditions where no aging occurs. When the constriction section 9 is provided, as shown in FIG.
When passing through this, the fiber bundle protrudes from the surface,
The free ends of the stretched fibers rotate with the rotation of the fiber bundle and are prevented from being entangled in the fiber bundle, improving yarn quality. Figure 5 shows another embodiment of the present invention. show. In this example, a long insert 6f is used to promote the generation of free end fibers in the core, and the air injection hole 11 in the vortex reservoir is narrowed.
The feature is that it is provided in section 9 to enhance the false twisting effect.

As detailed above, according to the present invention, a large number of fibers having free ends are generated by applying a suction air in a direction substantially perpendicular to the axial direction of the fiber bundle at the upstream pressure in the false twisting nozzle. Moreover, the other end is twisted into the core and then introduced into the downstream heating area while maintaining this state as much as possible, so a good binding effect is obtained and quality is improved. This makes it possible to spin excellent yarn. Furthermore, compared to conventional false twisting nozzles, no additional air source or other energy is required to achieve this effect, making it more economical.

Furthermore, since the slit tube that comes into contact with the fiber bundle most often is of the insert type, there are significant effects such as ease of size maintenance and deterioration.

Note that at the start of spinning, a cotton-like blockage may occur due to the suction E5 of the insert, but in that IJA case, pull out the insert until the tip matches the nozzle population, and in this state, air the fiber bundle. It is also possible to perform operations such as pushing the insert into a predetermined depth after the fiber bundle has been sufficiently separated after reaching the position of the injection hole.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of an example of false twisting nozzle/7ii according to the present invention, Figs. 2 and 3 are side views of the insert (slit pipe), and Fig. 4 is a cross-sectional view of the constricted part. An example and FIG. 5 are side cross-sectional views of another embodiment of the temporary pressing nozzle according to the present invention. DESCRIPTION OF SYMBOLS 1... Fiber bundle, 2... Introduction part, 3... Heating tube, 4
...Inlet, 5...Decompression chamber, 6...Insert, 7
... Slot, G, 9... Throttle #) part, 10... Whirlpool chamber, 11... Air injection hole, 12... Air storage chamber, 13...
・Irregularities.

Claims (1)

[Claims] 1. In a false twisting nozzle for bundle spinning that includes a leaded pipe equipped with an air vortex generating means, a large diameter decompression chamber is concentrically connected to the upstream side of the heating pipe, and a fiber bundle passage is connected concentrically to the upstream side of the heating pipe. A false twisting nozzle for bundled spinning, characterized in that a slit tube with a peripheral surface perforated is provided concentrically in the decompression chamber, whereby the fiber bundle is allowed to proceed in an expanded state to an air vortex region. 2. The nozzle according to claim 1, wherein the downstream end of the slit pipe is a free end, and a gap is provided between this and the downstream fiber passage. 3. The nozzle as claimed in claim 1 or 2, wherein a small-diameter constriction portion is provided concentrically between the decompression chamber and the heating tube. 5. A nozzle according to any one of claims 1 to 4, wherein the slit tube is a replaceable insert.