JP3371300B2 - Method and apparatus for twining yarn - 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 and apparatus for combining three or more multifilament yarns.

[0002]

2. Description of the Related Art Conventionally, in order to combine two or more fiber bundles, each yarn is combined with a V-shaped or U-shaped grooved guide or is squeezed between flat rollers while squeezing them. Was common.

For example, Japanese Unexamined Patent Publication (Kokai) No. 26950/1990 discloses a method of ironing a yarn between two rollers at a time, and twisting by a separately provided roller to form a yarn. This is effective when two fiber bundles are combined, but when three or more fiber bundles are combined, the yarn thickness on the roller becomes thicker, and the entanglement between the single fibers becomes loose, which easily causes thread cracking after combination. However, there is a drawback in that it is not possible to continuously obtain a stable entangled yarn. Such a multi-thread yarn with many yarn cracks significantly impairs the operability in the next step, or when the multi-fiber yarn is a carbon fiber precursor acrylic yarn, when the carbon fiber after firing is processed into a prepreg sheet. However, there is a problem that a uniform sheet is not formed and quality defects occur.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems of the prior art, in particular to prevent the yarn cracking of the compound yarn and to obtain the yarn in a continuously stable entangled state. To provide the device.

[0005]

In order to achieve the above object, the method according to the present invention has the following constitution. That is, in the method of combining three or more traveling yarns using the guide, the two first guides 1 arranged side by side as the first stage ,
1'contact the running yarn substantially at right angles ,
After running yarn passed through the first guide 1 is superimposed on the second guide through into contact with the third guide, and another running yarn passed through the first guide 1 'third guide,該合yarn yarn the guide 4 is further provided separately with respect to, of the yarn Ru twist
This is a compounding method, and the bending angle of the yarn on the guide is as follows.
How to mix yarns to fill . θ1: 150 ° to 160 ° θ2: 170 ° to 180 ° θ3: 130 ° to 140 ° (where θ1 is the third thread of the running yarn passing through the first guide 1 ′).
Bending angle on the id, θ2 goes through the second guide to the third guide
Angle on the third guide of the thread leading to
The second of the yarn from the cord 1 to the third guide through the second guide
Bending angle on the guide)

In order to achieve the above object, the device according to the present invention has the following constitution. That is, 3 or more
A traveling yarn device for doubling and a juxtaposed two first guide, and the second to fourth guides are arranged sequentially shifted along the yarn path, the first to third guide guide shaft direction and substantially parallel to each other, the fourth guide are arranged twisted with other guides of the guide axis, upon Tsuito
Guide so that the bending angle of the yarn on the guide satisfies the following.
Yarn of doubling apparatus characterized by There are disposed. θ1: 150 ° to 160 ° θ2: 170 ° to 180 ° θ3: 130 ° to 140 ° (where θ1 is the third thread of the running yarn passing through the first guide 1 ′).
Bending angle on the id, θ2 goes through the second guide to the third guide
Angle on the third guide of the thread leading to
The second of the yarn from the cord 1 to the third guide through the second guide
Bending angle on the guide)

The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic plan view showing an example of the yarn combining means of the present invention, and FIG. 2 is a schematic side view of FIG. 1, showing an example in which four yarns are combined. FIG. 3 is a schematic plan view showing a conventional yarn combining means, and shows an example in which four yarns are combined.

In FIG. 1, 1, 1'and 2, 3 are first to third guides for the purpose of gathering or spreading and stacking yarns,
4 is a guide for twisting the yarn, 5, 5'and 6, 6'is a yarn before compounding, 7 is a yarn after compounding, 8 is 1, 1 ', 2, 3 and 4 Shows a common base for fixing.

In the present invention, as the first step, the yarns 5, 5 '(6, 6') to be combined are first of all the first guide 1.
By making contact with (1 ') at a right angle, each yarn is expanded into a tape shape, and the directions are aligned and overlapped.

Next, as a second step, the yarns piled up in the first stage are brought into contact with the second and third guides (2, 3) at right angles to be spread again into a tape shape and are superposed in the same direction. The superposition of the yarns in the first stage and the second stage should be called a pre-compounding yarn, and although the yarns are entangled with each other, they are almost layered.

Next, the yarn that has undergone the second stage of superposition is guided to the fourth guide (4), and the third guide is guided by the fourth guide.
Twist the overlapping yarns between the 4th guides. Due to this twist, the superposed yarns move in the direction of converging on the fourth guide, the entanglement between the yarns further increases, and the yarn combining is completed, and the yarn (7) after the yarn cracks. Can be significantly reduced. In this device, so-called preliminary mixing yarn is performed in two stages, so when three or more multi-filaments are combined, the entanglement of the yarns in the overlapping yarns that have undergone the second stage is the first stage. The number of yarns is larger than the number of yarns that have been overlapped with each other, and the twisting of the yarns due to twisting is more effective. On the other hand, in the conventional yarn mixing device shown in FIG. 3, since three or more multi-filament yarns are combined in one step, the entanglement between the yarns in the preliminary combination yarn step is unfavorable.
Thread breakage of the compound yarn becomes easy to occur.

In the present invention, the guides 1, 1'and 2, 3 need only be arranged at positions where the yarns can be overlapped with each other, and the distance between the guides in the running direction of the yarns and the like are set appropriately. The yarn angle shown in FIG. 1 is θ1: 150 ° to 160 °, θ2: 170 ° to 1
80 °, θ3: It is preferably in the range of 130 ° to 140 °. Yarn angle θ1 is less than 150 ° or θ2 is 17
If it is less than 0 ° or θ3 is less than 130 °, the operability during threading on the guide deteriorates. θ1 is 160 ° or θ
When 2 exceeds 180 ° or θ3 exceeds 140 °, the yarn cracking rate tends to increase.

It is desirable that the twist angle of the fourth guide (4) with respect to the second and third guides (2, 3) is 45 ° to 90 °, preferably 60 ° to 90 °. If the twist angle is less than 45 °, the yarn cracking rate tends to increase, and
If the angle exceeds 0 °, the combined yarn becomes rope-shaped, and problems such as difficulty in uniformly spreading the yarn are likely to occur particularly when a sheet is processed in the next step.

The guide used in the present invention may be a known guide or guide roller, but a fixed cylindrical guide, a shell rotation guide roller with a built-in bearing, etc. are particularly preferable.

In the present invention, the above guides 1,
In addition to 1 ', 2, 3, and 4, it is also possible to use a guide for stabilizing the yarn path.

[0017]

[Examples] In this example, thread cracking was measured by the following method.

After the yarn is mixed, hold the yarn with both hands at an interval of about 40 cm and repeat tension and relaxation 5 times. After that, the yarn end portion at the center of the compound yarn is held by both hands, the compound yarn is torn in the longitudinal direction, and the one that is broken into yarn units before compounding is defined as “with yarn crack”. The sample was repeatedly measured 20 times by this method to calculate the yarn cracking rate.

(Example) In the apparatus of FIG. 1, 1, 1 ',
A guide roller with an outer diameter of 21.5 mmφ is used as a few guides, the yarn angle θ1 is 155 °, θ2 is 176 °, θ
The guide roller was arranged so that 3 was at 135 °.
A guide roller having an outer diameter of 21.5 mmφ was used as the guide 4, the distance between the guide 3 and the guide 3 was about 40 mm, and the twist angle of the guide 4 with respect to the guides 2 and 3 was 90 °.
The multifilament yarn (1.
5 denier 2000 acrylic yarns) were combined to form 12000 denier yarns. The yarn breakage rate of the compound yarn was about 5%, and the condition of the compound yarn was good.

(Comparative Example) When four yarns similar to those of the embodiment were combined using the apparatus shown in FIG. 3, the yarn breakage ratio of the combined yarn was about 70%, and the yarn breakage was remarkable.

[0021]

EFFECTS OF THE INVENTION According to the present invention, it is possible to prevent a yarn breakage of a compound yarn and to obtain a continuously stable yarn in an entangled state. In particular, when the present invention is applied to a carbon fiber precursor acrylic yarn, when the carbon fiber after firing is processed into a prepreg sheet, the carbon fiber bundle is unlikely to cause yarn cracks, and a uniform prepreg sheet can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of a yarn mixing device of the present invention.

FIG. 2 is a schematic side view showing an example of the yarn blending device of the present invention.

FIG. 3 is a schematic plan view showing a conventional yarn blending device.

[Explanation of symbols]

1, 1 ': 1st guide 2: 2nd guide 3: 3rd guide 4: 4th guide 5,5', 6, 6 ': yarn 7 before compounding yarn: yarn 8: 1 after compounding , 1 ′, 2, 3 and 4 are fixed by a common base θ1: 1 ′, the bending angle θ2: 2 of the yarns superposed by 3 is superposed by the bending angle θ3: 1 of the yarns 3 superposed by Angle of bending due to 2

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) D02J 1/00-13/00

Claims (6)

(57) [Claims] 1. A method for combining three or more running yarns using a guide, wherein two first yarns arranged in parallel are used as a first stage .
1 guides 1, 1 ′ are brought into contact with the running yarn substantially at right angles , the running yarn passing through the first guide 1 is brought into contact with the third guide through the second guide, and the first guide 1 ′ is after superimposed on the different running yarn passing through the third guide, the guide 4 is further provided separately with respect該合yarn yarn, a doubling method for the yarn Ru added <br/> a twist , Bending of the yarn on the guide
A yarn combination method in which the bending angle satisfies the following . θ1: 150 ° to 160 ° θ2: 170 ° to 180 ° θ3: 130 ° to 140 ° (where θ1 is the third thread of the running yarn passing through the first guide 1 ′).
Bending angle on the id, θ2 goes through the second guide to the third guide
Angle on the third guide of the thread leading to
The second of the yarn from the cord 1 to the third guide through the second guide
Bending angle on the guide) 2. The yarn-plying method according to claim 1, wherein the twist angle is in the range of 45 ° to 90 ° . 3. The yarn-placing method according to claim 1, wherein the guide is a guide roller. 4. A device for combining three or more running yarns.
The two first guides and the second to fourth guides arranged side by side are sequentially displaced along the yarn path, and the guide axis directions of the first to third guides are substantially parallel to each other. The guides are arranged so that they are twisted with respect to the guide axis directions of other guides, and when the thread is threaded, the bending angle of the yarn on the guide is as follows.
A yarn combining device , wherein guides are arranged so as to satisfy the condition . θ1: 150 ° to 160 ° θ2: 170 ° to 180 ° θ3: 130 ° to 140 ° (where θ1 is the third thread of the running yarn passing through the first guide 1 ′).
Bending angle on the id, θ2 goes through the second guide to the third guide
Angle on the third guide of the thread leading to
The second of the yarn from the cord 1 to the third guide through the second guide
Bending angle on the guide) 5. The yarn-placing device according to claim 4, wherein the twist angle is in the range of 45 ° to 90 ° . 6. The yarn compounding device according to claim 4, wherein the guide is a guide roller.