JPH01272831A - Spinning apparatus - Google Patents

Abstract

PURPOSE:To increase the spinning speed and the winding force around a core fiber, by setting the distance between a nip point of a front roller of a drafting apparatus and the air-ejection nozzle at the back side to be smaller than the maximum fiber length of supplied fiber bundle. CONSTITUTION:A fiber bundle S delivered from a front roller 5 is twisted with an air-ejection nozzle unit 6 to form a spun yarn Y. The fiber bundle S is treated with reversely rotating compressed air streams shown by the arrows 13, 14 at the 1st nozzle 11 and the 2nd nozzle 12 in the nozzle unit 6. The distance D between the action point A to impart false-twist to the fiber bundle S by the 2nd nozzle 12 and the nip point N of the roller 5 is made to be smaller than the maximum fiber length of the fiber bundle S.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a so-called pneumatic spinning device.

[Conventional technology]

In place of ring-type and oven-end type spinning devices, so-called pneumatic spinning devices using compressed air have been developed.

The spinning device sequentially introduces a fiber bundle (sliver) drafted by a drafting device into two front and rear air injection nozzles with mutually different rotation directions, and a rear nozzle (second nozzle).
At the same time, the front nozzle (first nozzle) applies a swirling air flow in the opposite direction to the twisting direction of the false twist to generate a balloon around the core fiber containing the false twist. generate wrapped #a fibers that wrap around the
This is a device for obtaining bundled spun yarn.

In this device, the spinning yarn generation mechanism is as described above, so if you are trying to increase the spinning speed, improve the efficiency of energy used for air injection, and reduce power consumption, it is necessary to The efficiency of energy transfer to the heating or balloon of the injection energy to the sliver must be increased. In particular, the rear nozzle (second nozzle) must give false twist to the core fibers, so the air pressure is usually higher than the front nozzle (first nozzle), which only creates a balloon.
How to increase the efficiency of the second nozzle's action on the fiber bundle is an extremely important factor in achieving the above objective.

[Problem to be solved by the invention]

Based on the above findings, this invention particularly improves the working efficiency of the second nozzle, thereby easily increasing the spinning speed, reducing energy consumption, and increasing the winding force around the core fiber. The purpose is to make it possible to obtain a bound spun yarn.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a fiber bundle for supplying a gap between a nip point of a front roller of a drafting device and an air injection nozzle (second nozzle) on the rear side in the above-mentioned pneumatic spinning device. It is proposed that the fiber length be set smaller than the maximum fiber length of .

〔Example〕

FIG. 2 shows an outline of a pneumatic spinning machine.

Fiber bundle (raw material sliver) drawn from can (K) (
S) is introduced into the draft device (1) and drafted to a predetermined thickness.

The device (1) comprises a back roller (2), a middle roller (4) with an eproge (3), and a front roller (5).
), each pair is pressed against each other at a predetermined pressure via a fiber bundle (S). The fiber bundle (S) coming out of the front roller (5) is introduced into the air injection nozzle unit (6), where it is heated and spun into yarn (Y).
The product is then pulled out by a delivery roller (7), passes through a slab catcher (8), is traversed by a traverse guide (9), and is wound onto a package (P) that is rotationally driven by a friction roller (10). .

(G) is a guide that is arranged between the back roller (2) and the middle roller (4) and has a hole through which the fiber bundle (S) passes.
5) The width of the m-male mold (S) coming out of the mold can be regulated.

Figure 1 shows details around the air injection nozzle unit (6).

The nozzle unit (6) has a front roller (5) inside.
), and the nozzles (11) and (12) are arranged in opposite directions as shown by arrows (13) and (14). A swirling compressed air flow is applied to the fiber bundle (S). Second
The nozzle (12) applies false twist to the fiber bundle (S) by its airflow, and the twist due to the false twist passes through the first nozzle (11) and propagates to the front of the front roller (5). The fiber bundle (S) immediately after coming out of the front roller (5) is compressed by the pair of rollers (5) and has a flat shape, so the m male shape (S) has a triangular shape as shown in (15). form a portion of length (L) that converges on . In this triangular portion, the fibers near the ends of the fiber bundle have a higher tension than the fibers in the center, so they are more likely to break or fall out. First nozzle (11)
The balloon (B) is formed by rotating the fiber bundle (S) in the direction opposite to the twisting direction of the false twist. Due to this balloon (B), some of the fibers indicated by (Sl) near the above-mentioned end are cut or pulled out, and other fibers (S2
). In this way, the core fiber (S
Only 2) has a false twist by the second nozzle (12), and the wound fiber (Sl) is wound in the opposite direction to the twist. The fiber bundle (S) receives an untwisting action when passing through the second nozzle (12), and at this time, the core fiber (S2) is untwisted and becomes a wound fiber (Sl).
is further heated around it to produce spun yarn (Y).

On the right side of the above process, the first nozzle <11) is connected to the balloon (B
), the fiber (Sl) is separated from the other fiber (S2), and the separated fiber (Sl) is wound onto the other fiber (S2).

Further, the second nozzle (12) acts at point (A) in FIG. 1 to impart false twist to the fiber bundle (S), and the nip point between point (A) and the front roller (5) ( The distance (D) between the fiber bundle (S) (raw material sliver) and the fiber bundle (S) is set to be smaller than at least the maximum fiber length of the fiber bundle (S) (raw material sliver) supplied according to the present invention.

That is, the maximum fiber length referred to here means, for example, in the staple diagram shown in Figure 3, which is created by arranging 100% polyester slivers using the sorter method, (FO) corresponds to the maximum fiber length; In the case of a sliver represented by (FO=38 am), the above-mentioned interval (D) is set to at least 38 mm or less.

Therefore, most of the fibers (S2) that come out from the front roller (5) and undergo the above-mentioned false twisting action have their tips (A
) point and begins to receive the false twisting torque, the trailing edge is still actually nipped by the front roller (5), which is more pronounced than if the trailing edge were free.
False-twisted with higher efficiency.

Of course, even in the case of the conventional device where the distance (D) is longer than the maximum fiber length, the fiber (S2) is connected to the second nozzle (12).
However, in this conventional case, the rear ends of all fibers (S2) have passed the nip (N) point by the time their tips reach the second nozzle (12). , the rear end is held in place only by the frictional force between the fibers due to the fact that the fibers (S2) themselves are bundled in the east direction, which is weaker than the actual twisting force due to the nip of the front roller (5). The twist is only held by force, and the false twisting torque applied at point (A) is released by slipping at the rear end of the buaiba (S2), resulting in only a small amount of false twisting being obtained. It had become.

The distance (D) needs only to be smaller than the maximum fiber length, and as long as it is within the range of mechanical constraints (the presence of the first nozzle (11)), the distance between the second nozzle and (12)
It is preferable to bring it closer to the nip point (N).

Note that the example shown in the third figure above is made of 100% polyester.
A sliver cut to 8 mm was used, but for example, natural fibers such as cotton were added to this sliver to
A raw material sliver is obtained by mixing about 70%,
Even in the case of a sliver having a staple diagram as shown in FIG. 4, the maximum fiber length (Fl) for synthetic fibers may be applied.

In other words, all the cotton currently produced in each country has an effective fiber length (F2) (defined in JIS standard L1019) of about 30 or so, which is roughly indicated by the gentle curve shown in Figure 4. The fiber length of the synthetic fibers to be mixed is:
Currently, 38 mm (1.5 inches) is the mainstream, and using synthetic fibers of 38 mm or less does not contribute to the strength or texture of the spun yarn being manufactured, but rather impairs them. Therefore, even in the case of a blend of cotton and synthetic fibers as mentioned above, if the synthetic fibers contain about 30%, the maximum amount of synthetic fibers is ¥a.
It is sufficient to set the interval (D>) according to the fiber length (Fl).

In other words, the maximum fiber length in the present invention refers to the length of the fibers when the fibers accounting for at least 30% of the raw material sliver are synthetic fibers of uniform length.

This is because if it contains about 30% or more of trimmed synthetic fibers, which are generally longer than cotton, the above nip point (
Near N), each cotton fiber is fully bundled by the synthetic fiber, and the length is short and the tip is the second
Arrives at the nozzle (12) and the rear end is the nip point (N)
Although the rear ends of the cotton fibers that have passed through the front roller are not directly nipped by the front roller, the nipping force is sufficiently transmitted through the frictional force between the fibers, and the fibers become untwisted. It is.

Of course, the above theory does not apply to raw material slivers in which the proportion of natural fibers with irregular lengths exceeds 80%, such as cotton, but according to observations by the inventors of the present invention, the above theory ( Approximately 30% of synthetic fibers
If the fiber length is above, the maximum fiber length may be based on the fiber length of the synthetic fiber).

That is, when a spinning experiment was conducted using the apparatus shown in Figure 1.2 under the condition that the distance (D) was set approximately equal to the length (Fl) using the sliver of the stable diagram shown in Figure 4, polyester When the fiber ratio exceeded about 30%, a remarkable improvement in the winding condition of the spun yarn was observed.

〔Effect of the invention〕

As described above, in the spinning device according to the present invention, most of the wA Kazuo type fibers that exit the draft device do not slip due to the actual nip force of the front roller at the rear end, and the tip remains untwisted. Since false twisting torque is applied to the side, the efficiency of applying false twist by the second nozzle is high.
Therefore, it is possible to easily increase the spinning speed and reduce power consumption, and furthermore, it is possible to obtain a high-quality bound spun yarn in which the wrapped fibers are sufficiently wrapped.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the vicinity of a nozzle unit of a spinning device according to the present invention, FIG. 2 is an explanatory diagram of the entire spinning device, and FIG. 3.4
The figures are stability diagrams of raw material slivers; Figure 3 is a sliver made of 100% cotton, and Figure 4 is a sliver made from a blend of cotton and synthetic fiber. (1) Draft device (5) Front roller (11) First nozzle (12) Second nozzle (S
) Fiber bundle (Y) Spun yarn (N) Nifve point (D) Spacing (FO) (Pi) Maximum fiber length

Claims (1)

[Scope of Claims] A device for manufacturing a spun yarn by sequentially introducing a fiber bundle drafted by a draft device into two front and rear air injection nozzles having different rotation directions, the device comprising: a nip point of a front roller of the draft device; and the rear air injection nozzle is set to be smaller than the maximum fiber length of the fiber bundle to be supplied.