JPH0665816A - Spinning - Google Patents

Abstract

PURPOSE:To make the composition of a produced spun yarn similar to that of a ring yarn, in producing the spun yarn by applying a circulating air current to a non-twisted fiber bundle drafted through a drafting unit and twisting it. CONSTITUTION:While supplying a fiber bundle from a drafting unit involving a porous roller 25 under a negative pressure to the neighborhood of a guide member projected so as to direct the top part toward the inlet of a spindle, a circulating air current is injected to the neighborhood of the inlet of the spindle so as to twist the fiber bundle. The exhaust air gas is returned to the porous roller 25.

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 spun yarn by twisting an untwisted fiber bundle drafted by a drafting device by applying a swirling air current to the yarn.

[0002]

2. Description of the Related Art The applicant of the present invention comprises a nozzle block having a nozzle for causing a swirling air flow to act on a fiber bundle exiting a draft device, a hollow spindle, and a guide member projecting with its tip toward its inlet. An apparatus for manufacturing a spun yarn by twisting a non-twisted fiber bundle by an airflow has been proposed and filed separately.

[0003]

In the above-mentioned conventional spinning device, since the twisting to the upstream side is stopped at the tip of the guide member, the fibers sent from the front roller are arranged in parallel and near the spindle inlet. And is twisted at the tip of the guide member. Therefore, in this spinning device, when the distance from the front roller to the tip of the guide member is long, the moving fiber bundle is affected by the air flow, and the short fibers often drop out. Therefore, although the yarn produced is a real twist, the distribution of the fiber length is biased toward the long fiber side, and is different from the ring yarn. vice versa,
If the distance from the front roller to the tip of the guide member is short (for example, the distance from the nip point of the front roller to the tip of the guide member is 16 mm using a sliver having an average fiber length of 25.2 mm), the yarn produced will be 4 (2)
As shown in (1), a bundled spun yarn composed of parallel core fibers and wound fibers is obtained. Moreover, the fibers are cut during the process of moving the fiber bundle to the tip of the guide member, and the dropout rate of the short fibers is 1.5%.

The present invention is a method for producing a spun yarn by twisting an untwisted fiber bundle drafted by a drafting device by applying a swirling air current to the spun yarn, and the composition of the produced yarn is close to that of a ring yarn. The purpose is to

[0005]

In order to achieve the above object, the spinning method of the present invention comprises a guide member which projects from a draft device having a perforated roller to which negative pressure is applied, with its tip directed toward the spindle inlet. While supplying a fiber bundle around, a swirling airflow is jetted near the spindle inlet for twisting, and the exhaust air is returned to the porous roller.

[0006]

[Operation] In the spinning device configured as described above, the fiber bundle exiting the draft device is drawn into the device by the action of the air flow ejected from the nozzle, and the front ends of all the fibers of the fiber bundle are From around the guide member, the fiber bundle being formed into the yarn is drawn and guided into the spindle.
Further, the rear end side of the fiber is exposed to the swirling airflow ejected from the nozzle and spirally wraps around the fiber bundle that is being formed into a yarn as the yarn runs to form a real twist spun yarn. . On the other hand, the cotton wool discharged together with the exhaust gas is returned to the surface of the perforated roller, merges with the fiber bundle in the draft, and is reused.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the spinning method of the present invention will be described with reference to FIGS.

In this spinning method, basically, a fiber bundle drafted around the guide member 5 projecting with its tip directed toward the spindle inlet 6a is supplied, and a swirling air flow is jetted near the spindle inlet 6a. However, a porous roller 25 in which a negative pressure is applied to one of the front rollers constituting the draft device is adopted, and the porous roller 25 allows a weak binding force to the fiber rear end of the supply fiber bundle. And the exhaust of the swirling airflow is returned to the perforated roller 25.

The spinning device used for carrying out this spinning method is arranged next to the draft device D, which comprises a back roller 20, a middle roller 21 having an apron 22, and front rollers (23-25). The air spinning device A, and a cotton dropping transfer pipe 26 that recirculates the cotton wool discharged from the air spinning device A.

The pneumatic spinning device A is generally arranged inside a casing 1 following the draft device and has a nozzle block 2 having a nozzle 3 and a guide member support 4 having a guide member 5 at the inlet thereof. And a rotary spindle 6 inserted into the casing 1 on the inlet side.

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

The portion of the nozzle block 2 that covers the vicinity of the spindle inlet 6a is a hollow cylindrical chamber 8 having a small diameter along its outer shape, 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 with a diameter. An annular hollow chamber 9 formed in the lower casing 1a and a tangential air escape hole 10 following the hollow chamber 9 are formed in a portion following the hollow chamber 8. A cotton wool transfer pipe 26 is connected to the air escape hole 10.

Inside the upper casing 1b, a hollow air reservoir 11 is formed between it and the nozzle block 2. The nozzle block 2 communicates with the air reservoir 11, faces downstream slightly away from the inlet 6a of the spindle 6, and has a hollow chamber 8
Four air injection nozzles 3 are formed which are tangential to the air reservoir 11, and a hose (not shown) is connected to the air reservoir 11 through a hole 12. The direction of the nozzle 3 is set to be the same as the rotation direction of the spindle 6.

The compressed air supplied from the hose, after flowing into the air reservoir 11, is ejected from the nozzle 3 into the hollow chamber 8,
A high-speed swirling airflow is generated in the vicinity of the spindle inlet 6a. This air flow swirls inside the hollow chamber 8 and then diffuses outward while gently swirling inside the hollow chamber 9 to release the escape hole 10
It is guided in the direction and discharged. At the same time, this air flow
A suction air flow is generated which flows from the nip point of the front roller into the hollow portion of the casing 1.

The guide member support 4 is a cap-like member having a fiber bundle introduction hole 13 formed by widening the side facing the perforated roller 25 constituting the front roller described later, and having a pin-shaped guide at the center. The member 5 is fixed.

The guide member 5 protrudes from the center of the guide member support 4 and has a free end, which faces the inlet 6a of the spindle 6.

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

In the air bearing, a cylindrical bush 17 having an air ejection hole 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 is 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 4c, the compressed air is discharged through a slight gap between the spindle 6 and the bush 17 through the air reservoir 17a, the air ejection hole 17b, and the spindle. 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 opening tangentially in the bearing casing 14, and the bearing casing 14 also has 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, while the compressed air supply hole 1 is provided.
A plurality of semicircular recesses 6c for receiving the jetted air flow are formed on the outer peripheral surface of the spindle 6 corresponding to the opening of 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.
The spindle 6 is rotated by passing through a and hitting the concave portion 6c of the spindle 6. The air flow that rotates the spindle 6 is discharged through the air discharge holes 16b and 14b.

The spindle 6 assists in twisting the yarn and can be manufactured depending on the yarn even if the spindle 6 does not rotate. Therefore, the spindle 6 does not necessarily have to rotate.

The front roller of the draft device D is a rubber top roller 23, and a perforated roller 2 arranged below the top roller 23 and rotating in the opposite direction.
5 and a non-rotating suction tube 24 disposed inside thereof.

The perforated roller 25 has innumerable small holes 25a of about 20 microns, is supported by the hollow suction tube 24, and covers the outer surface of the suction tube 24 with a slight gap. The suction tube 24 is formed with an air suction opening 24a having a predetermined length in the circumferential direction. Therefore, the air drawn from the suction tube 24 is drawn to the air suction hole 24a.

As shown in FIG. 3, since the distance from the tip of the guide member 5 to the point n at the front roller is shorter than the distance from the front roller to the point n, the trailing ends of most of the fibers fed from the front roller are It is adsorbed by the perforated roller 25 to be weakly restrained, moves from point A to point B in that state, and is then attracted toward the tip of the guide member 5. Therefore, the fibers fed from the front roller are substantially straightened and separated sufficiently, the subsequent swiveling of the fiber rear end is facilitated, and the fibers are less likely to be disturbed by the airflow flowing from the inlet of the spinning device. This point does not change even if the distance from the front roller nip point a to the tip of the guide member 5 is increased to some extent. Therefore,
Short fibers are prevented from falling off, unevenness of yarn thickness is reduced, yarn strength is improved, and the distance from the tip of the guide member 5 to the nip point a of the front roller is increased to some extent to move between them. It is also possible to prevent disconnection.

Finally, in this spinning device, as shown in FIG. 1, a cotton wool transfer pipe 26 is connected between (the air escape hole 10 of) the pneumatic spinning device A and the perforated roller 25 of the top roller. Has been done. The fly cotton transfer pipe 26 is bent into an L shape, and the bent portion has an opening 27. The suctioned air flow from the suction tube 24 also reaches the fly dust transfer pipe 26, in which air and fly dust flows are generated. At that time, foreign matters such as heavy leaf dust fall from the opening 27 of the bent portion, and only the fibers are carried to the surface of the perforated roller 25.

In the spinning system thus constructed, the fiber bundle drafted by the drafting device is
The front end of all the fibers of the fiber bundle is drawn into the casing 1 from the fiber bundle introduction hole 13 by the action of the air flow ejected from the nozzle 3, and the fiber bundle being formed into the yarn is drawn from around the guide member 5. It is guided and guided into the spindle 6. Further, the rear end side of the fiber moves while being adsorbed by the porous roller 25, and when leaving the porous roller 25, the nozzle 3
The axial component force of the airflow ejected from the fiber acts on each fiber, and the fibers are inverted from the spindle inlet 6a in a sufficiently separated state.
The separated fibers at the rear end are exposed to the swirling airflow ejected from the nozzle 3, and as the yarn travels, the fibers are spirally wound around the fiber bundle that is being formed into a yarn, and become a spun yarn of a real twist shape. . On the other hand, the floating fibers discharged from the air escape hole 10 through the cotton wool transfer pipe 26 are returned to the surface of the perforated roller 25 by the suction negative pressure of the suction tube 24 in the perforated roller 25 and the fiber bundle in the draft. It will be reused after joining with. The guide member 5 functions as a so-called pseudo core that prevents the propagation of twist during the yarn forming process or temporarily acts as a substitute for the central fiber bundle, and is a non-twisted yarn that remarkably appears in a conventional air-bonded spun yarn. It serves to prevent the formation of core fiber bundles and effectively form the yarn only from the wound fibers.

Here, according to the spinning method of the present invention, a sliver having an average fiber length of 25.2 mm is used, and the distance from the nip point a of the front roller to the tip of the guide member 5 is 2 mm.
When the yarn was spun at 0 mm, as shown in (2) of FIG. 5, the yarn was a real twist which was almost the same as the ring spun yarn, and the dropout rate of the short fibers was 0.8%, which was small. It was Therefore, it is considered that the distribution of the fiber length is the same as that of the ring yarn.

[0029]

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

That is, it is possible to produce a yarn whose appearance, distribution of fiber length and tenacity properties are very close to those of a ring yarn, and the fiber loss is reduced to half compared with the conventional method. Further, the distance from the nip point of the front roller to the tip of the guide member can be increased to some extent, and the cutting of the fiber moving between them can be prevented.

[Brief description of drawings]

FIG. 1 is a side view of a spinning device in which a part of a draft device is broken.

FIG. 2 is a cross-sectional view of a pneumatic spinning device.

FIG. 3 is a cross-sectional view near the inlet of the pneumatic spinning device.

FIG. 4 is an external view of each yarn obtained by the spinning method of the present invention and the conventional spinning method.

[Explanation of symbols]

 2 Nozzle block 3 Nozzle 4 Guide member support 5 Guide member 6 Spindle 6a Spindle inlet 25 Perforated roller A Pneumatic spinning device D Draft device

Claims (1)

[Claims] 1. A draft device having a perforated roller to which a negative pressure is applied supplies a fiber bundle around a guide member projecting with its tip toward the spindle inlet and jets a swirling airflow near the spindle inlet. A spinning method in which twisting is performed and the exhaust air is returned to the porous roller.