JPS6320924B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing untwisted spun yarn and an entangling treatment nozzle.

More specifically, short fiber bundles such as slivers or stretch-cut tows are introduced into an interlacing treatment nozzle either alone or in combination with continuous yarns, and the single fibers constituting the short fiber bundles or the single fibers constituting the continuous yarns are introduced into the interlacing treatment nozzle. A novel method for intertwining fibers to form a continuous thread, and an entangling treatment nozzle used in the method.

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. It was difficult to sufficiently approximate conventional spun yarn in terms of quality, especially uniformity.

The inventors of the present invention have conducted extensive research into how the quality defects described above occur, and as a result, have found that the cause lies in the fluid treatment nozzle, and have arrived at the present invention. In other words, in conventional fluid treatment nozzles, the fluid injection holes are provided in the fiber bundle introduction path so as to inject the fluid perpendicularly to the center of the fiber bundle introduction path or toward the exit side. The tensions experienced by the bundles were approximately equal or greater at the front.

On the other hand, in the upstream of the fluid treatment nozzle, the fiber bundle introduced into the fluid treatment nozzle has almost no conjugation between the single fibers that make up the fiber bundle, so the binding force is very weak, and each single fiber has a slight force. It is in an unstable state where it can easily slip due to Therefore, when the fiber bundle passes through the fluid treatment nozzle, some of the single fibers constituting the fiber bundle easily slide due to the fluid jetted from the fluid treatment nozzle, the tension of the thread, etc. The fibers may be transported faster than the bundle, creating sags or loops, or the free ends of the single fibers may become entangled in clumps, forming slabs or neps.
The uniformity of the yarn was significantly impaired. The present invention aims to improve the above-mentioned defects of conventional fluid treatment nozzles and provide a non-twisted spun yarn having excellent uniformity.

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 consisting of discontinuous fibers or having discontinuous fibers as a main component into a non-twisted spun yarn. In the method of introducing a fiber bundle into an entangling treatment nozzle to form a non-twisted spun yarn, the diameter of the exit side of the fiber bundle introduction path of the entanglement treatment nozzle is made smaller than the inlet side diameter, so that the injection fluid of the entanglement treatment nozzle is A method for producing a non-twisted spun yarn, characterized in that a propulsive force is imparted to the fiber bundle in a direction opposite to the traveling direction of the fiber bundle to impart binding properties to the single fibers constituting the fiber bundle, (a) The central axis of the fluid injection hole intersects with the central axis of the fiber bundle introduction path.

(b) The central axis of the fluid injection hole is inclined with respect to the central axis of the fiber bundle introduction path so as to inject the fluid in the traveling direction of the fiber bundle, and the inclination angle θ is in the range of 60°≦θ90°. What's in it.

(c) The area ratio of the cross section orthogonal to the central axis of the fiber bundle introduction path between the exit portion of the fiber bundle introduction path and the portion where the fluid injection hole is open is 0.4≦Exit portion cross-sectional area/fluid injection hole. The opening cross-sectional area must be within the range of 0.7.

(d) At the same time, it is satisfied that the diameter of the fiber bundle introduction path upstream from the part where the fluid injection hole is opened is equal to the diameter of the opening part of the injection hole, or is larger toward the entrance side of the fiber bundle introduction path. An example is an entangling nozzle that does this.

The present invention will be explained in detail below.

The fiber bundle made of discontinuous fibers used in the method of the present invention is a fiber bundle made of fibers having a finite length, and is made of stable 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. Next, the fiber bundle is introduced into the entangling treatment nozzle 5, and the single fibers constituting the fiber bundle are entangled with each other, the ends are wrapped around the fiber bundle, and the fibers in the core are intertwined in a complicated manner. They are tied together to form a thread 6. Thereafter, 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.

FIG. 2A is a side view of the entangling treatment nozzle 5 used in the method of the present invention shown in FIG. ^1, and FIG. , fluid supply pipe 15, fluid transfer pipe 14,
It consists of a fluid injection hole 13 and a fiber bundle introduction path 12. The fiber bundle introduction path 12 of the entangling treatment nozzle 5 is
The diameter of the outlet side 12b is smaller than the diameter of the inlet side 12a including the fluid injection hole opening, and the fluid injection hole 13 injects fluid into the fiber bundle introduction path 12 in the traveling direction of the fiber bundle. Despite the inclination, the ejected fluid is configured to have a propulsive force in a direction opposite to the traveling direction of the fiber bundle.

Furthermore, the fiber bundle introduction path and the fluid injection hole must meet the following requirements.

First, the central axis of the fluid injection hole 13 is configured to intersect with the central axis of the fiber bundle introduction path 12. If the central axes of both of them are eccentric in one direction, a swirling vortex flow will occur in the fiber bundle introducing path 12, the fiber bundle 1 will be twisted, and it will be difficult to entangle the single fibers with each other, which is the object of the present invention. Cannot obtain yarn.

Furthermore, the central axis of the fluid injection hole is inclined with respect to the central axis of the fiber bundle introduction path so as to inject the fluid in the traveling direction of the fiber bundle, and the inclination angle θ is 60°≦θ≦
It must be within a 90° range.

FIG. 3 is a diagram showing the relationship between the angle of inclination θ and the handleability of the yarn during the process, and the relationship between the angle of inclination θ and the number of neps of the yarn obtained.

Here, the yarn handling property is evaluated by the number of yarn breakages of the twisted yarn using a ring twisting machine. It is.

In addition, the number of neps in the yarn was expressed as the number of neps per 125 m of yarn using a Worcester square meter.

As is clear from FIG. 3, when the angle of inclination θ exceeds 90°, the neps increase and the ease of handling decreases. Also, those with an inclination angle θ of less than 60 cannot be used because of poor handling.

Next, the area ratio of the cross section perpendicular to the central axis of the fiber bundle introduction path is within the above range in the exit portion of the fiber bundle introduction path and the portion where the fluid injection hole is opened.

If the cross-sectional area ratio is larger than 0.7, the driving force of the fluid jet in the direction opposite to the traveling direction of the fiber bundle decreases, resulting in an increase in neps, an increase in the thickness of the yarn, or
The strength of the yarn decreases, and furthermore, the handling property deteriorates, and there is no difference from the conventional method, making it impossible to achieve the object of the present invention.

On the other hand, if the above-mentioned cross-sectional area ratio is less than 0.4, the driving force in the direction opposite to the traveling direction of the fiber bundle becomes too large, which tends to disturb the arrangement of the fiber bundle, increase the number of neps, and weaken the entangling force. Therefore, the object of the present invention cannot be achieved because the mutual entanglement becomes low and the ease of handling becomes poor.

The diameter of the fiber bundle introduction path upstream from the opening of the fluid injection hole is either equal to the opening of the injection hole, or is larger toward the inlet side of the fiber bundle introduction path.

Thereby, the ejected fluid can have a propulsive force in the direction opposite to the traveling direction of the fiber bundle.

Note that it is convenient for the entanglement process and nozzle manufacturing to provide a pair of fluid injection holes near the exit side of the fiber bundle introduction path and at symmetrical positions with respect to the fiber bundle introduction path 12, as shown in FIG. However, if the central axis of the fiber bundle introduction path 12 and the central axis of the fluid injection hole 13 intersect, the number of fluid injection holes 12 may be one or three or more, and furthermore, the length of the fiber bundle introduction path may be It may be distributed in the direction. 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 entangling treatment 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.

Since the method of the present invention has the configuration described above, almost no tension is applied to the entangled fiber bundle being processed by the method of the present invention, and tension is mainly applied to the yarn material downstream of the entanglement treatment nozzle 5. This provides the advantageous effect that entanglement occurs within the entanglement treatment nozzle. That is, according to the entangling treatment nozzle 5 used in the method of the present invention, the diameter of the fiber bundle introduction path outlet 12b is smaller than the diameter of the inlet 12a, so the fiber bundle 1 receives a driving force in the opposite direction to the moving direction of the fiber bundle. It turns out. Therefore, the effect of reducing the external force on the fiber bundle before it is introduced into the entangling treatment nozzle 5 is obtained. Further, the entangling treatment 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 entangling treatment nozzle 5, so that the obtained yarn has no slack. The present invention has far fewer loops and has a uniform appearance than the conventional one, and the effects of the present invention can be maximized. Furthermore, since tension is applied to the thread at the front of the delivery roller, the thread does not wobble and has the effect of stabilizing the running of the thread.

In addition, the pressure of the jetting fluid of the take-up fluid nozzle 3 and the pressure of the jetting fluid of the entangling treatment nozzle 5 shown in FIG.
In order to obtain high quality, the overfeed ratio of the supply roller 2 to the delivery roller 7, etc.
It has a big impact. 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 -1 to 5%. 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 preferable. Eid is good.

In addition, 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, processing speed, nozzle dimensions, 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.

The present invention will be explained below using examples.

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

The fluid is supplied to the take-up fluid nozzle 3 using a piece 4 with an inclination angle α of 45° as shown in FIG. Compressed air of 4 kg/cm ³ was supplied from the pipe 16.

The entangling treatment nozzle 5 has two fluid injection holes 13 with a diameter of 0.8φ and an inclination angle θ of 75°, and an inlet diameter of the fiber bundle introduction path 12 with an inlet diameter of 1.3φ and an outlet diameter of 1-1φ, as shown in FIG. 5 Kg/cm ³ of compressed air was supplied from the fluid supply pipe 15 using a.

Under the above nozzle conditions, using a polyester tension-cut sliver with a total denier of 350, an average single yarn denier of 2.5, and an average fiber length of 350 mm as the supply fiber bundle 1, the overfeed ratio of the supply roller 2 to the delivery roller 7 was set to 1%. 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 evaluated using an evenness tester, the yarn size was 11%, 9.8%, and the thread count was 37%.
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 fiber manufacturing and its preparation process.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing one embodiment of the present invention. Figure 2 is a diagram showing an example of the entangling treatment nozzle shown in Figure 1, where A is a side view and B is a side view.
A cross-sectional view along line B' is shown. FIG. 3 is a diagram illustrating the relationship between the number of neps of the yarn obtained and the handleability with respect to the inclination angle θ of the fluid injection hole of the entangling treatment nozzle. 1... Fiber bundle, 5... Entanglement processing nozzle, 6...
Non-twisted spun yarn, 12...Fiber bundle introduction path, 13...Fluid injection hole.

Claims (1)

[Scope of Claims] 1. In 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 into an entangling treatment nozzle, the exit of the fiber bundle introduction path of the entangling treatment nozzle By making the side diameter smaller than the inlet side diameter, the ejected fluid of the entangling treatment nozzle has a driving force in a direction opposite to the traveling direction of the fiber bundle, thereby increasing the conjugation property to the single fibers constituting the fiber bundle. A method for producing a non-twisted spun yarn, characterized by imparting the following: 2. In an entangling treatment nozzle that creates a non-twisted spun yarn by tying together fiber bundles made of discontinuous fibers or having discontinuous fibers as a main component, (a) the central axis of the fluid injection hole intersects the central axis of the fiber bundle introduction path; thing. (b) The central axis of the fluid injection hole is inclined with respect to the central axis of the fiber bundle introducing path so as to inject the fluid in the traveling direction of the fiber bundle, and the inclination angle θ is 60°≦θ≦
Must be within a 90° range. (c) The area ratio of the cross section orthogonal to the central axis of the fiber bundle introduction path between the exit portion of the fiber bundle introduction path and the portion where the fluid injection hole is opened is 0.4≦Exit portion cross-sectional area/Fluid injection hole opening The partial cross-sectional area must be in the range ≦0.7. (d) At the same time, it is satisfied that the diameter of the fiber bundle introduction path upstream from the part where the fluid injection hole is opened is equal to the diameter of the opening part of the injection hole, or is larger toward the entrance side of the fiber bundle introduction path. An entangling processing nozzle characterized by: