JPH0641821A - Method for spinning - Google Patents

Abstract

PURPOSE:To find optimum spinning conditions of a short fiber typified by a cotton fiber in a method for producing a spun yarn by applying a turning stream onto the fiber using a device having a spindle and guide member. CONSTITUTION:A drafted fiber bundle having short fiber length is fed from the circumference of a guide member 5 projected in a state turning the top toward a spindle inlet 6a and a turning stream is jetted into the vicinity of the spindle inlet 6a in a state inclined at an angle of 70-90 deg. to the advancing direction of a yarn to spin the yarn.

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 short fiber bundle typified by cotton fibers by applying a swirling air flow to twist the bundle.

[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 short fiber bundle by an airflow has been proposed and filed separately.

[0003]

When spinning short fiber yarns with the above spinning device, fiber loss is particularly large depending on the conditions, which is not satisfactory. Further, when spinning a long fiber yarn, a yarn having a satisfactory appearance cannot be obtained depending on conditions. Ideally, as shown in FIG. 3, each fiber separated from the supply fiber bundle S in the vicinity of the spindle inlet 6a should flow to the downstream side as shown in (a) while rotating by the swirling airflow around the spindle 6. However, in the case of long fibers, due to the length of the fiber, the fiber central portion is often separated from the fiber bundle and wound around as shown in (b). The winding (bundling yarn) 21 and the loop 22 are likely to occur. In addition, 23 in FIG. 4 is a protruding end of a normal fiber.

The present invention provides a spinning method which has a spindle and a guide member and which produces a spun yarn by causing a swirling air flow to act, and which is optimal for spinning short fibers typified by cotton fibers. Has an aim.

[0005]

In order to achieve the above object, the spinning method of the present invention supplies a fiber bundle having a short fiber length, which is drafted from around a guide member projecting with its tip directed toward the spindle inlet. , 70 to 90 with respect to the yarn advancing direction
The yarn is spun by inclining and injecting a swirling airflow near the spindle inlet.

[0006]

[Operation] In the spinning method 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 inverted from the spindle inlet and separated into each fiber. The separated fibers at the rear end are exposed to a swirling airflow ejected from a nozzle, and as the yarn travels, the fibers are spirally wound around a fiber bundle that is being formed into a yarn and become a spun yarn of a real twist. Looking at the action of the air flow ejected from the nozzle, since the inclination angle of the nozzle is large,
The progressing force is small, the force for sending the floating fibers in the yarn advancing direction is weak, and fiber loss is reduced. In addition, since the fiber length is short, the action of separating the fibers from the fiber bundle is sufficiently performed, and the turning component force is large, so that strong twist is applied.

[0007]

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

A spinning device provided for carrying out the spinning method of the present invention generally includes a nozzle block 2 having a nozzle 3 arranged inside a casing 1 following a draft device,
The guide member support body 4 having a guide member 5 is provided at the inlet portion thereof, and the rotary spindle 6 inserted into the casing 1 at 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 has a conical portion whose outer diameter increases toward the downstream side. 6b.

A portion of the nozzle block 2 which 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.

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 in the shape of a cap having a fiber bundle introduction hole 13 in the upper part deviated from the center,
A pin-shaped guide member 5 is fixed to the upper center.

The guide member 5 projects from the center of the upper portion of the guide member support 4 and has its tip free, and faces the inlet 6a of the spindle 6.

The spindle drive is a 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 which are tangentially opened 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 does not rotate. Therefore, the spindle 6 does not necessarily have to rotate.

In the spinning device constructed 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 3, and the front ends of all the fibers of the fiber bundle are guided. A spindle 6 which is drawn around the member 5 by a fiber bundle being formed into a yarn and rotates.
Be guided inside. Further, on the rear end side of the fiber, the axial component force of the air flow ejected from the nozzle 3 acts and the spindle inlet 6
It is inverted from a and separated into each fiber. 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. .

Here, several nozzle blocks 2 having different inclination angles of the air jet nozzles 3 with respect to the yarn advancing direction are prepared, each having a spindle inlet inner diameter of 0.8 mm, a spindle rotational speed of 100,000 rpm, and a spindle inlet 6a to the front. Set the distance to the roller nip point to 18.5 mm,
A spinning speed of 30 using carded cotton with an average fiber length of 21.5 mm
Attempts were made to produce spun yarns of Ne30 and Ne40 at 0 m / min.

The results are shown in FIG. According to this, in the case of short fiber spinning, it is most preferable to use a nozzle block having a nozzle inclination angle of 70 to 90 degrees, in which the yarn strength and the number of neps are in a satisfactory range, and fiber loss is extremely small. Can be said. Even if the nozzle inclination angle is 90 degrees, the upstream side of the nozzle 3 is constricted, so the air ejected from the nozzle 3 flows to the downstream side.

When the nozzle inclination angle is as large as 70 to 90 degrees in this way, the component force of the air flow ejected from the nozzle 3 in the yarn advancing direction becomes small and the force for feeding the floating fibers in the yarn advancing direction becomes weak. As a result, fiber loss will be greatly reduced. Also, even if the progressing force is small,
Since the fiber length is short, the action of separating the fibers from the fiber bundle is sufficiently performed. Further, since the swirling component force of the air flow ejected from the nozzle 3 is large, a strong twist is exerted and the yarn strength can be secured.

On the other hand, several nozzle blocks 2 having different inclination angles of the air jet nozzles 3 with respect to the yarn advancing direction are prepared, spun yarns are manufactured using wool fibers having an average fiber length of 72 mm and 80 mm, and the characteristics of each yarn. When the inclination angle of the nozzle 3 exceeds 70 °, the IPI value (thread 1
An extremely thick part, an extremely thin part, and a number of neps measured per Km) become large, and there are many bar-rolled or loop-shaped non-uniform parts. If the inclination angle of the nozzle 3 is less than 30 °, the yarn strength will be insufficient.
According to this result, when spinning at a spinning speed of 100 to 300 m / min using fibers having an average fiber length of 60 to 85 mm, the nozzle block 2 having a nozzle inclination angle of 30 to 70 degrees is used.
It can be said that it is most preferable to use.

When the nozzle inclination angle is reduced to 30 to 70 degrees in this way, the component force of the air flow ejected from the nozzle 3 in the yarn advancing direction becomes large, and the fibers are separated from the fiber bundle despite the long fiber length. The action to do is fully done. Further, although the swirl component of the air flow ejected from the nozzle 3 is small, the long fiber yarn may originally have a smaller number of twists than the short fiber yarn, so that it is sufficient to apply the necessary twist. By the way, the twist coefficient (per meter) is 120 to 160 for short fiber yarn and 60 to 88 for long fiber yarn. Note that fiber loss is 2
%.

[0027]

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

That is, it is possible to manufacture a yarn having an extremely large amount of wound fiber and having appearance and strength characteristics comparable to those of the ring yarn, and of course, the jetting inclination angle of the swirling airflow with respect to the yarn traveling direction is 70 to 90 °. As a result, fiber loss can be extremely reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a spinning device used for carrying out a spinning method of the present invention.

FIG. 2 is a graph showing a relationship between a tilt angle of a nozzle and various characteristics of a spun yarn produced.

FIG. 3 is a diagram illustrating a fiber behavior near a spindle inlet in long fiber spinning by a conventional spinning device.

FIG. 4 is a diagram showing an appearance of a long fiber spun yarn spun by a conventional spinning device.

[Explanation of symbols]

 3 nozzle 5 guide member 6 spindle 6a spindle inlet

Claims (1)

[Claims] 1. A swirling air current is supplied near a spindle inlet by supplying a draft fiber bundle having a short fiber length from around a guide member protruding toward the spindle inlet and inclining the fiber bundle at an angle of 70 to 90 ° with respect to the yarn advancing direction. A spinning method in which a yarn is spun by jetting.