JP2713089B2 - Core yarn manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a core yarn in which a sheath fiber such as cotton is coated around a core fiber by supplying a core fiber such as a synthetic fiber having high strength in the process of producing a spun yarn. It is about.

[0002]

2. Description of the Related Art As a method for producing a core yarn, a method of supplying a core fiber in a process of producing a spun yarn with a ring spinning apparatus has been widely known. Also, as shown in FIG.
After the draft device D, a core fiber is supplied in the process of producing a spun yarn by a pneumatic spinning device provided with a twisting device including two air injection nozzles 24 and 25 for generating swirling air flows in mutually different directions. Is also known.

[0003]

Any of the yarns produced by the above-described methods for producing each core yarn has the disadvantage that the core fibers are visible from the surface and the sheath fibers are displaced when handled.

An object of the present invention is to produce a core yarn in which the core fiber is not visible from the surface and which is strong in handling.

[0005]

In order to achieve the above object, a method for producing a core yarn according to the present invention comprises a nozzle block having a nozzle for applying a swirling airflow to a fiber bundle exiting a draft device, and a rotating or stationary nozzle block. Directly from the entrance of the spinning device consisting of a hollow spindle without passing through the draft device ,
The core fiber is supplied via a tensor .

[0006]

[Operation] In the core yarn manufacturing method configured as described above, the core fiber is directly introduced into the spinning device, passes through the spindle, and is drawn out by the delivery roller. On the other hand, the fiber bundle that has exited from the draft device is drawn into the spinning device by the action of the airflow that is ejected from the nozzle, and the front ends of all the fibers of the fiber bundle are drawn from the periphery of the core fiber to the core fiber, and are moved into the spindle It is led to. In addition, the rear end of the fiber is inverted from the spindle entrance and separated into fibers. The separated fibers at the rear end are exposed to a swirling airflow spouting from the nozzle, and are spirally wound around the core fiber as the yarn travels to form a core yarn.

[0007]

1 and 2, an apparatus for manufacturing a core yarn will be described, and an embodiment of a method for manufacturing a core yarn according to the present invention will be described.

[0008] The spinning apparatus S used for manufacturing the core yarn of the present invention includes a front roller Rf of a draft apparatus D.
And a delivery roller Rd. The nozzle block 2 having the nozzle 3 is disposed generally inside the casing 1 following the draft device D, and the inlet cap 4 fitted to the inlet. And a rotary spindle 6 inserted into the casing 1 on the inlet side.

The draft device D employs, for example, a device including a front roller Rf, a second roller R2 having an apron, a third roller R3, and a back roller Rb. Each of these top rollers is supported by a pendulum arm 19 as in other spinning devices. Reference numeral 20 denotes a handle for opening and closing the pendulum arm 19.

The inlet portion cap 4 has a passage 1 for receiving the fiber bundle and the core fiber F1 supplied from the draft device D.
3 is formed, and a bush 5 for narrowing the spread of the fiber bundle is provided at an outlet portion thereof.

A fiber bundle passage 7 is formed at the center of the spindle 6 so that the outer diameter of the inlet 6a is sufficiently small. The portion following the inlet 6a is a conical portion whose outer diameter increases toward the downstream side. 6b.

A portion covering the vicinity of the spindle inlet 6a of the nozzle block 2 is a small-diameter cylindrical hollow chamber 8 along the outer shape thereof, and the upstream side thereof is slightly larger than the tip diameter of the spindle 6 by the nozzle block 2. It has a cylindrical shape. A portion following the hollow chamber 8 is formed with an annular hollow chamber 9 formed in the lower casing 1a and a tangential air release hole 10 subsequent thereto.

A hollow air reservoir 11 is formed between the upper casing 1b and the nozzle block 2. The nozzle block 2 communicates with the air reservoir 11, and is directed downstream, slightly away from the inlet 6 a of the spindle 6, and has a hollow chamber 8.
The air reservoir 11 is connected to a hose (not shown) via a hole 12. The direction of the nozzle 3 is set to be the same as the rotation direction of the spindle 6.

After the compressed air supplied from the hose flows into the air reservoir 11, it is jetted from the nozzle 3 into the hollow chamber 8, and
A high-speed swirling airflow is generated near the spindle inlet 6a. This air flow, after swirling inside the hollow chamber 8, diffuses outward while slowly swirling inside the hollow chamber 9, and
Guided in the direction and discharged. At the same time, this air flow
A suction airflow that flows into the hollow portion of the casing 1 from the nip point of the front roller is generated.

The spindle drive unit includes a bearing casing 14
Is supported by an air bearing inside and is driven by an air turbine.

In the air bearing, a cylindrical bush 17 having an air outlet 17b is fitted into the bearing casing 14 following the air reservoir 17a, and the bearing casing 14 also has a compressed air supply hole 14c communicating with the air reservoir 17a. It is provided. Reference numeral 18 denotes a cap of the bearing casing 14.

In this air bearing, the compressed air supply hole 1
When compressed air is supplied from a hose (not shown) connected to the spindle 4c, the compressed air is discharged through a small gap between the spindle 6 and the bush 17 through the air reservoir 17a and the air ejection hole 17b, and is discharged. 6 is in a non-contact state with the bush 17.

The air turbine is fitted with a cylindrical bush 16 having a compressed air supply hole 16a and an air discharge hole 16b that open tangentially in the bearing casing 14. The compressed air supply hole 16a or the air A compressed air supply hole 14a or an air discharge hole 14b communicating with the discharge hole 16b is provided.
A plurality of semicircular recesses 6c for receiving the jet airflow are formed on the outer peripheral surface of the spindle 6 corresponding to the opening of the spindle 6a.

In this air turbine, when compressed air is supplied from a hose (not shown) connected to the compressed air supply hole 14a, the compressed air is supplied to the compressed air supply hole 16a.
a, and hits the concave portion 6c of the spindle 6 to rotate the spindle 6. The air flow that has caused the spindle 6 to rotate is discharged through the air discharge holes 16b and 14b.

The spindle 6 assists in twisting the yarn. Even if the spindle 6 does not rotate, the spindle 6 can be manufactured. Therefore, the spindle 6 does not necessarily need to be rotating.

In the above apparatus, the core fiber F1 drawn from the bobbin B passes through the yarn guides 21 and 22 and the tensor 23 and directly from the side of the front roller Rf to the passage 13 of the inlet cap 4 of the spinning apparatus S. Be guided.

As the core fiber F1, a multifilament such as nylon or polyester having high strength is suitable. However, depending on the target yarn, an appropriate yarn such as a spun yarn can be used.

Next, the manufacturing process of the core yarn in the present invention will be described.

The core fiber F1 passes directly from the side of the front roller Rf through the tensor 23 to the passage 1
3 and is pulled out by a delivery roller Rd through a fiber bundle passage 7 of a spindle 6. Therefore, a predetermined tension is always applied to the core fiber F1, and the position as the core is
Location ensure reliably ing. On the other hand, the fiber bundle that has exited from the draft device is drawn into the device by the action of the airflow ejected from the nozzle 3, and the front ends of all the fibers of the fiber bundle are
1 is guided into the spindle 6 which is pulled by the core fiber F2 and rotates. Further, the rear end side of the fiber is reversed from the spindle inlet 6a by the axial component force of the air flow ejected from the nozzle 3 and is separated into fibers. The separated fiber at the rear end is exposed to a swirling airflow spouting from the nozzle 3, and is spirally wound around the core fiber F1 as the yarn Y travels to form a real twisted core yarn Y. If the core fiber is supplied through the draft device, the twisting of the swirling air flow ejected from the nozzle 3 causes the core fiber between the twisted portion and the front roller of the draft device to be excessively twisted, and Cuts may occur. In particular, when the core fiber is thin, twist breakage occurs remarkably.

Finally, the core yarn manufactured by the method of the present invention, the ring spinning and the pneumatic spinning having two air injection nozzles 24 and 25 for generating swirling air flows in different directions shown in FIG. Are shown in Table 1.
FIG. 5 shows the outer surface of each yarn. In this figure, (1) is a core yarn obtained by the production method of the present invention, and almost only the sheath fiber F2 can be seen from the surface.
(2) is a core yarn formed by ring spinning, in which a sheath fiber F2 is wrapped around a twisted core fiber F1. (3) is a core yarn by pneumatic spinning having two air injection nozzles that generate swirling airflows in different directions, and the core fibers F1 are almost aligned in parallel.
, The sheath fibers F2 are wound in a bundle.

[0026]

[Table 1]

From Table 1 and FIG. 5, it can be seen that the core yarn produced by the production method of the present invention has very little core fiber seen from the surface, and is very excellent with little displacement of the sheath fiber even when handled. The core yarn manufactured by the method of the present invention is also confirmed from the cross-sectional view of FIG. 3 that the core fiber F1 having a circular cross section is concentrated at the center of the core yarn. FIG. 4 is a cross-sectional view of the core yarn obtained by ring spinning, and it can be seen that the core fiber F1 having a circular cross section also exists in the peripheral portion. In addition, the core fiber F1
It is also clear that there is a twist.

[0028]

Since the present invention is configured as described above, it has the following effects.

That is, the core fiber and the sheath fiber are clearly separated, the core fiber is hardly seen from the surface, the sheath fiber is hardly displaced even when handled, and an extremely excellent core yarn having no directionality in handling is produced at a high speed. Can be manufactured.
In addition, even if the core fiber is thin, cut it.
There is no.

[Brief description of the drawings]

FIG. 1 is a side view showing a relationship between a spinning device, a draft device, and a delivery roller used in the present invention.

FIG. 2 is a longitudinal sectional view of a spinning device used in the present invention.

FIG. 3 is a cross-sectional view of a core yarn manufactured by the manufacturing method of the present invention.

FIG. 4 is a cross-sectional view of a core yarn manufactured by ring spinning.

FIG. 5 is an outer surface view of each core yarn manufactured by the manufacturing method, ring spinning, and pneumatic spinning of the present invention.

FIG. 6 shows a swirling air flow in different directions 2
1 is a schematic view of pneumatic spinning having two air injection nozzles.

[Explanation of symbols]

 2 Nozzle block 3 Nozzle 6 Spindle D Draft device F1 Core fiber F2 Sheath fiber

Claims (1)

(57) [Claims] 1. A spinning device comprising a nozzle block having a nozzle for applying a swirling airflow to a fiber bundle exiting a draft device, and a rotating or stationary hollow spindle through an inlet of a spinning device directly via a tensor without passing through a draft device . Core yarn production method for supplying core fibers.