JPS6215648B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing untwisted spun yarn.

More specifically, a short fiber bundle such as a roving, a sliver, or a stretched tow is introduced into a false twisting nozzle, either alone or in combination with a continuous yarn.
The present invention relates to a novel method of winding fluff around the single fibers constituting the short fiber bundle or the single fibers constituting the continuous yarn to form a continuous yarn.

Conventionally, various methods have been proposed for producing yarn with a spun yarn texture with high efficiency by subjecting short fiber bundles to fluid treatment. etc., and it was difficult to sufficiently approximate conventional spun yarn in terms of quality, especially uniformity.

The inventors of the present invention conducted extensive research into how the above-mentioned quality defects occur, and as a result, they found that the cause lies in the false-twisting nozzle, and arrived at the present invention. In other words, in the conventional false-twisting nozzle, the fluid injection hole is provided so as to inject the fluid perpendicularly to the fiber bundle introduction path or toward the exit side of the fiber bundle introduction path. The tension applied to the fiber bundle was either greater in the front part or almost equal in both parts. For this reason, the untwisting point (the point at which the false twist is untwisted) is shifted to the rear of the false twisting nozzle, so there is less fluff entrapped during untwisting, and sufficient binding properties cannot be obtained. .

On the other hand, in the upstream of the false twisting nozzle, the fiber bundle introduced into the entangling treatment nozzle undergoes no twisting other than false twisting.
It mostly consists of fiber bundles.

There is no entanglement between the single fibers, and therefore, after untwisting, the binding force is very weak, and each single fiber is in an unstable state where it easily slides and moves even with a slight force. Therefore, when the fiber bundle passes through the false twisting nozzle, if the wings are not sufficiently wrapped around it, some of the single fibers that make up the fiber bundle will be blown by the false twisting nozzle. Due to tension, the fibers easily slide and are transported faster than other fiber bundles, resulting in slack or loops, or the free ends of single fibers become entangled in a lump, forming slabs or neps, causing the yarn to become unusable. Uniformity was seriously impaired. The present invention aims to improve the defects of the conventional false twisting nozzle as described above and to provide a non-twisted spun yarn having excellent uniformity and cohesiveness.

That is, the present invention provides a method of introducing a fiber bundle consisting of discontinuous fibers or having discontinuous fibers as a main component into a non-twisted spun yarn by introducing a fiber bundle into a false twisting nozzle, in which the jetting fluid of the false twisting nozzle is applied to the fiber bundle. A method for producing a non-twisted spun yarn characterized by spraying the fiber at an angle in a direction opposite to the traveling direction of the fiber bundle to impart binding properties to the single fibers constituting the fiber bundle. As a false twisting nozzle, the center axis of the fiber bundle introduction path and the center axis of the fluid injection hole that opens at an angle toward the entrance side of the fiber bundle introduction path do not intersect, and a swirling force is applied. It is preferable to use one that is eccentric to one side as much as possible and that has an inclination angle θ between the central axis of the fiber bundle introduction path and the central axis of the fluid injection hole in the range of 20°≦θ<90°.

The present invention will be explained in detail below.

The fiber bundle consisting of a discontinuous fiber bundle used in the method of the present invention is a fiber bundle consisting of fibers having a finite length, and is a fiber bundle consisting of staple fibers or a sliver obtained by cutting a tow. It may be.

Further, in the present invention, a fiber bundle partially mixed with continuous yarn may be used.

This will be explained below using figures.

FIG. 1 is a process diagram showing one embodiment of the present invention.

In FIG. 1, a fiber bundle 1 is taken off from a supply roller 2 in a twisted manner by a take-off fluid nozzle 3 which performs both a suction action and a swirling action. Subsequently, the fiber bundle is introduced into a false twisting treatment nozzle 5, and the ends of the single fibers constituting the fiber bundle are wrapped around the fiber bundle and tied together to form a thread 6. Then the yarn 6
is transferred as a non-twisted spun yarn 6 from a delivery roller 7 and wound onto a package 9 via a winding roller 8.

Figure 2A shows the take-up fluid nozzle 3 shown in Figure 1.
FIG. 2B is a side view of a piece having a fluid injection hole which is a part of the piece, and FIG.

In FIG. 2, the fluid injection hole 10 forms an inclination angle α with respect to the fiber bundle introduction hole 11.
The fluid is injected toward the exit of the fiber bundle, and a thrust is applied in the direction of movement of the fiber bundle. Further, the central axis of the fluid injection hole is eccentric in one direction with respect to the central axis of the fiber bundle introducing hole, so as to apply a swirling force to the fiber bundle. With this configuration, short fiber bundles with low conjugation properties can be stably taken off from the supply roller even at high speeds without single fibers being wound around the rollers.

FIG. 3 is a side view and a sectional view taken along line B-B' of the false twisting nozzle 5 according to the present invention shown in FIG. 13, and a fiber bundle introduction path 12. Fluid injection hole 1 of the false twisting nozzle 5
3 forms an inclination angle θ with respect to the fiber bundle introduction path 12,
The fluid is injected toward the entrance of the fiber bundle introduction path 12, and the central axis of the fluid injection hole 13 is eccentric to one side with respect to the central axis of the fiber bundle introduction hole 12, so that a swirling force can be applied. It is configured as follows.
Therefore, the external force acting on the fiber bundle before being introduced into the false twisting nozzle 5 can be reduced, and false twisting can be efficiently applied to a high degree.

Furthermore, the effect that the fiber bundle receives from the false twisting nozzle 5 of the present invention will be explained.

According to the false twisting treatment nozzle 5 according to the present invention, the fluid injected from the fluid injection hole 13 is applied to the fiber bundle introduction hole 1.
Since the fiber bundle 1 is injected toward the inlet side of the fiber bundle 2, the fiber bundle 1 receives a thrust force in a direction opposite to the moving direction of the fiber bundle. Therefore, almost no tension is applied to the fiber bundle in the false-twisted state upstream of the false-twisting nozzle 5, and tension is mainly applied to the fiber bundle downstream of the false-twisting nozzle 5, so that the false-twisting is The advantageous effect is that the twisting nozzle is blocked and the untwisting point occurs within the nozzle. As a result, the relative rotational speed difference between the yarn after untwisting and the swirling flow of the nozzle increases, and furthermore, this has the effect of causing the fluff ends to flow in the opposite direction to the false twisting direction at the front of untwisting. When the twist is untwisted, the fluff ends are effectively wrapped around the fiber bundle mainly in the opposite direction to the false twisting direction and are tightly bound, eliminating defects such as slugs and neps that were caused by conventional weak cohesiveness. It is possible to obtain a yarn material with a uniform appearance and greatly improved width. Furthermore,
The false-twisting nozzle 5 of the present invention has almost no thrust toward the downstream side, and tension is applied to the yarn on the downstream side of the false-twisting nozzle 5, so the yarn that is obtained is It has a more uniform appearance with far fewer sags and loops than conventional products.

In order to maximize the effects of the present invention, it is preferable that the false twisting nozzle 5 used in the method of the present invention has the following configuration. That is, first, the inclination angle θ of the central axis of the fluid injection hole 13 with respect to the central axis of the fiber bundle introduction path 12 is 20°≦θ<
90° is preferably in the range of 30°≦θ≦80°, and the jetting fluid is jetted toward the entrance side of the fiber bundle introduction path 12. Here, the inclination angle θ
When the angle is less than 20°, not only is it not possible to impart sufficient false twist to the fiber bundle 1, but also the arrangement of weakly bound fiber bundles upstream of the false twisting nozzle 5 is disturbed, resulting in an increase in slubs and neps. On the other hand, if the inclination angle θ exceeds 90°, the method becomes similar to the conventional method, and the object of the present invention cannot be achieved. Further, the central axis of the fiber bundle introducing path 12 of the false twisting treatment nozzle 5 is eccentric in one direction from the central axis of the fluid injection hole 13 opening into the fiber bundle introducing path 12, and has a turning force. If the central axes of both of them are not eccentric in one direction, but also in the crossing or opposite direction, a swirling vortex will not be generated in the fiber bundle introduction path 12, and the fiber bundle 1 will not be disturbed, making it difficult to wind the fluff. As a result, a yarn with a weak single fiber result is obtained, and the yarn targeted by the present invention cannot be obtained.

Here, regarding the arrangement of the fluid injection holes 13, the third
As shown in the figure, it is convenient from the viewpoint of fluff winding performance and nozzle manufacturing to provide a pair of fiber bundle introduction paths 12 at symmetrical positions, but the cross section of the fiber bundle introduction path 12 is tangent to one side. The number of fluid injection holes 12 may be one or three or more, and may be distributed in the length direction of the fiber bundle introduction path.
In addition, the dimensions of the fiber bundle introduction path 12 and the fluid injection hole 13 may be appropriately selected according to the denier and cross-sectional shape of the single fibers constituting the fiber bundle 1, or the total denier of the yarn to be obtained. good. Further, the present false twisting nozzle 5 may be of a one-piece type, or may be of a slit type or a half-split type with appropriate slits provided for ease of handling.

In addition to the structure of the entangling treatment nozzle described above, the pressure of the jetting fluid of the take-up fluid nozzle 3, the entangling treatment nozzle 5
The pressure of the injected fluid, the overfeed ratio of the supply roller 2 to the delivery roller 7, etc. are also important conditions for obtaining high quality. That is, the take-up fluid nozzle pressure needs to be set so that the fiber bundle does not wrap around the supply roller 2, and a suitable value is about 2 to 5 kg/cm ³ . Further, the nozzle pressure for the entangling process needs to impart sufficient conjugation to the fiber bundle, and a suitable pressure is about 2 to 5 kg/cm ³ . It is desirable that these two nozzle pressures be as small as possible within the necessary range. The appropriate overfeed ratio of the supply roller 2 to the delivery roller 7 is 3 to 10%, and if the number of fibers that make up the fiber bundle is large, a low overfeed is better, and conversely, if the number of fibers that make up the fiber bundle is small, a high overfeed is recommended. is good. Further, it is preferable that the direction of rotation of the take-up nozzle is opposite to the direction of rotation of the false-twisting treatment nozzle.

The above-mentioned take-up fluid nozzle pressure, entangling treatment nozzle pressure, and overfeed rate are each related to each other, and the single fiber denier short fiber length of the supplied fiber bundle 1, the cross-sectional shape, the type of oil agent, the humidity of the atmosphere, Appropriate conditions are selected depending on the denier of the yarn material, processing speed, etc.

It goes without saying that the untwisted spun yarn obtained by the method of the present invention can be additionally twisted and used for conventional twisted spun yarns.

Hereinafter, the present invention will be described with reference to examples.

Example 1 A non-twisted spun yarn was spun in the process shown in FIG.

For the take-up fluid nozzle 3, a piece 4 with an inclination angle α of 45° as shown in FIG. Pressurized air of 16 to 4 kg/cm ³ was supplied.

The false twisting nozzle 5 has an inclination angle θ of 60° as shown in FIG. 3, and a diameter of the fluid injection hole 13 of 1.1φ×2
False-twisting direction S was used, and the fiber bundle introduction path 12 had a diameter of 3φ, and compressed air of 5 kg/cm ³ was supplied from the fluid supply pipe 15.

Under the above nozzle conditions, a polyester tension-cut sliver with a total denier of 350, an average single yarn denier of 3.5, and an average fiber length of 400 mm was used as the supply fiber bundle 1, and the overfeed ratio of the supply roller 2 with respect to the delivery roller 7 was 8%. The untwisted spun yarn was spun under the condition that the surface speed of the supply roller 2 was 200 m/mm. There were almost no interrupted yarns or troubles during spinning, and when the obtained yarn was measured using an evenness tester, yarn unevenness μ% was 10.6%, and neps were 4 pieces/
A product with a length of 125 m and a very uniform appearance with few loops, sag, and fuzz was obtained. In addition, the conjugation property was strong enough to withstand the weaving and preparation steps.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing one embodiment of the present invention. Figure 2 is a diagram showing an example of the piece of the drawing fluid nozzle shown in Figure 1, where A is a side view and B is a side view A.
- Shows a cross-sectional view along line A'. FIG. 3 is a diagram showing an example of the false twisting nozzle shown in FIG. 1, in which A is a side view and B is a sectional view taken along the line BB' of the side view. DESCRIPTION OF SYMBOLS 1... Fiber bundle, 5... False twisting nozzle, 6... Untwisted spun yarn, 12... Fiber bundle introduction path, 13... Fluid injection hole.

Claims (1)

[Claims] 1. A method for producing a non-twisted spun yarn by introducing a fiber bundle consisting of discontinuous fibers or having discontinuous fibers as a main component into a false-twisting nozzle, in which the jetting fluid of the false-twisting nozzle is directed to A method for producing a non-twisted spun yarn, which comprises spraying the yarn at an angle in a direction opposite to the traveling direction of the fiber bundle to impart binding properties to the single fibers constituting the fiber bundle. 2. In a false twisting nozzle in which fiber bundles made of discontinuous fibers or mainly composed of discontinuous fibers are tied together to form a non-twisted spun yarn, (a) the fiber bundle introduction path is aligned with respect to the central axis of the fiber bundle introduction path; The central axes of the fluid injection holes that open at an angle toward the inlet side do not intersect, but are eccentric to one side in order to apply a turning force. (b) A false twisting nozzle characterized in that an inclination angle θ between the central axis of the fiber bundle introduction path and the central axis of the fluid injection hole is in the range of 20°≦θ<90°.