JP2004142945A - Yarn route roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a yarn route roller making it difficult to affect the shape of yarn and capable of providing improved unwinding property. <P>SOLUTION: This yarn route roller comprises a roller body having a roller surface and a roller shaft supporting the roller body. In the yarn route, the roller surface thereof is tilted relative the roller shaft so that, when the yarn route roller is rotated, the angle of the roller surface relative to the roller shaft varies within the range of -10 to +10°. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a yarn path roller for guiding and conveying yarns such as natural fiber yarns, synthetic fiber yarns, glass fiber yarns, and carbon fiber yarns.

The yarn path roller is used, for example, to guide, transport, or change the running direction of the yarn unwound from the yarn package.

As such a yarn path roller, a so-called grooved roller having a V-shaped groove or a so-called flanged roller having a flange (guide side plate) on a side surface is well known.

The grooved roller is such that the yarn runs on the groove bottom by its tension.However, since the yarn is pinched at the groove bottom, for example, in the case of a flat yarn, the flattening is distorted and rounded. Would.

鍔 Although the flanged roller prevents the yarn from coming off the roller by the side flange, the shape may change when the yarn comes into contact with the flange.

There is also a guide in which the yarn is caused to travel while floating by the force of pressurized air. However, the structure is complicated and the running cost is increased because the pressurized air is constantly used (see, for example, Patent Document 1).
JP-A-5-24743

An object of the present invention is to solve the above-mentioned problems of the above-described conventional yarn path roller and to provide a yarn path roller which does not easily affect the shape of the yarn.

In order to achieve the above object, the present invention has a roller body having a roller surface and a roller shaft that supports the roller body, and the angle of the roller surface with respect to the roller shaft when rotated is θ _1. to vary in the range of through? _2, to provide a yarn path roller comprising tighten Kawase oblique roller surface with respect to the roller axis. It is practical that the angles θ _{1 to} θ _{2 be} in the range of −10 ° to + 10 °.

(5) A method for producing a carbon fiber yarn using the roller. Furthermore, a traverse guide for winding a fiber yarn having the roller and a method for manufacturing a fiber yarn package using the traverse guide.

The fiber yarn package has a fiber yarn width variation of 10% or less determined under the following conditions while unwinding at a tension of 5 N and an unwinding speed of 10 m / min.
Fiber yarn width variation (%) = (fiber yarn width standard deviation / fiber yarn width average value) × 100
Sampling cycle t: 1 second Number of measurements n: 600

The yarn path roller of the present invention has a roller body having a roller surface, and a roller shaft that supports the roller body, and when rotated, the angle θ of the roller surface with respect to the roller shaft is θ ₁ to θ _2. The roller surface is obliquely inclined with respect to the roller shaft so as to change in the range of, so that the shape of the yarn is hardly affected as shown in the embodiment. That is, by applying a force for forcibly returning the yarn to the central portion of the roller main body, the yarn can be guided while being held at the same position on the roller main body.

に よ っ て By using the traverse guide of the present invention having the above-mentioned roller, a fiber yarn package having a good shape and small variation in the yarn position on the end face can be obtained.

Furthermore, the fiber yarn package of the present invention is excellent in unwinding property because the fiber yarn width variation is small.

In FIG. 1, the yarn path roller includes a roller shaft 1 rotatably provided with a roller shaft 1 as a drive shaft, and a roller body 2 fixedly supported by the roller shaft 1 and having a roller surface 2a. The roller body 2 is arranged such that when the yarn path roller rotates, the roller surface 2a obliquely intersects the roller shaft 1 such that the angle θ of the roller surface 2a with respect to the roller shaft 1 changes within the range of θ ₁ to θ _2. It is supported by. Therefore, the roller surface 2a moves like a seesaw when the yarn path roller rotates.

When the yarn is guided using such a yarn path roller, as shown in FIG. 2, the yarn Y moves rightward on the roller surface 2a (from a larger roller radius to a smaller roller radius) as shown by an arrow. )), But since the angle θ changes with the rotation of the yarn path roller, it then starts moving leftward as shown in FIG. Next, the state again becomes as shown in FIG. As described above, since the yarn Y travels while periodically reciprocating in the direction of the roller shaft 1 on the roller surface 2a, the yarn Y does not fall off the roller surface 2a, and the yarn is forcibly applied to the center of the roller body. A return force is applied, and the yarn can be guided while the yarn is always held at the same position on the roller body. Further, since the force applied to the traveling yarn Y depends on the above-described range of the angle θ, an appropriate range of the angle θ is determined according to the type and shape of the yarn. It is practical that the range of the angle θ, that is, θ _{1 to} θ _{2 be} in the range of −10 ° to + 10 °.

In the case of a V-shaped roller, the end of the fiber bundle is folded, or the fiber bundle is thinned due to the bite of the fiber into the groove. However, in the present invention, the surface where the yarn is in contact with the roller is always flat. Therefore, there is no influence such as the fiber bundle being thinned by the groove. The angles θ1 to θ2 at this time are preferably in the range of −10 ° to + 10 °, because if the angle is too large, the periodic reciprocation of the yarn on the roller described above becomes severe, and the yarn on the roller This is because, because of the sliding, the entanglement between the single fibers increases, for example, and the spread of the fiber bundle is reduced, thereby affecting the yarn.

The cycle of the reciprocation of the yarn depends on the speed of the yarn and the outer diameter of the roller body, but is preferably about 1/10 to 10 seconds.

FIG. 4 shows a yarn path roller of the present invention different from that shown in FIG. 1. The roller body 2 is rotatably supported on a fixed roller shaft 1 by bearings 3 and 4. As described above, the roller body 2 does not need to be supported by the bearing as shown in FIG. 1, and may be a driving roller, but may be rotatably supported by the roller shaft 1.

According to the present invention, the yarn path is maintained at a constant position, as in the case of the V-shaped roller, by making the roller surface oblique to the roller shaft to have an inclination. Further, more preferably, a free roller rotatably supported by the roller shaft 1 as shown in FIG. 4 and driven and rotated simply by contact with the yarn can prevent slipping.

In the yarn path roller described above, the yarn reciprocates once when the yarn path roller makes one rotation, but if a plurality of roller surfaces having different angles θ in the circumferential direction of the roller body are provided, It is also possible to change the angle θ a plurality of times with one rotation, and reciprocate the yarn a plurality of times.

5 and 6 show examples in which a plurality of roller surfaces (multi-curved surfaces) having different ranges of the angle θ in the circumferential direction of the roller body are provided. FIG. 5 is a side perspective view, and FIG. 6 is A in FIG. It is the figure seen from the direction. 5, in the example of FIG. 6, ₁ angle theta in the position of the radius R _1, the radius angle θ2 at the position of R _2, .theta.3 angle at the position of radius R _3, angle theta ₄ at the position of radius R ₄ and, which range in the circumferential direction at an angle theta is theta ₁ through? ₄ roller body is provided with a plurality of different roller surface is obtained by so as to multiple reciprocating yarn once rotation .

7 is a schematic view showing the application of the present invention to a traverse guide for a fiber yarn winding winder. FIG. 8 is a detailed enlarged view of the traverse guide in FIG. 7, where A is a side view and B is a front view. FIG. A traverse guide 7 equipped with a yarn path roller of the present invention, which is reciprocated from a solid line position on the left to a wavy position on the right by a reciprocating mechanism (not shown) such as a cam, a belt, and a rod, traverses the product bobbin. The fiber yarn is wound up. As shown in FIG. 8, the traverse guide 7 in FIG. 7 uses a plurality of rollers, the yarn guide roller of the present invention is used for the first guide roller 8, and the yarn guide held by the first guide roller 8 is used. Is twisted by 90 ° by the second guide roller 9 and wound around the bobbin 6. Since the yarn on the yarn path roller has the same effect as that obtained by using the V-shaped roller by using the yarn path roller of the present invention, the yarn is not always traversed, and is almost stationary in the middle. State.

It is preferable that the yarn guide roller of the present invention is used for the first guide roller 8, but the yarn guide roller of the present invention may be used for the second guide roller 9. Further, the yarn path roller of the present invention may be used for both the first guide roller 8 and the second guide roller 9.

By using such a traverse guide of the present invention for winding up a product, for example, the winding shape of a product of a carbon fiber yarn package having a flat yarn cross section can be greatly improved, but the application range of the traverse guide is limited to these. Do not mean.

By using the traverse guide of the present invention for winding a product, for example, the fiber yarn width variation of the fiber yarn package can be reduced to 10% or less, more preferably 8% or less, and still more preferably 6%. Here, the fiber yarn width variation of the package is a fiber yarn width variation obtained under the following conditions while unwinding at a tension of 5 N and an unwinding speed of 10 m / min.
Fiber yarn width variation (%) = (fiber yarn width standard deviation / fiber yarn width average value) × 100
Sampling cycle t: 1 second Number of measurements n: 600
Such a fiber yarn package having a fiber yarn width variation of 10% or less is particularly suitable as a raw material for producing a so-called low-weight prepreg having a small amount of reinforcing fibers per unit area.

Using the yarn path roller shown in FIG. 4, a flat carbon fiber yarn having a single fiber diameter of 7 μm, a single fiber number of 12,000, and a yarn width of about 10 mm was guided. The outer diameter of the roller body was 100 mm, and the angle θ was changed in a range from -5 ° to + 5 ° during one rotation of the roller body. The yarn speed was 10 m / min.
During the three-day operation, there was no shedding of the yarn from the roller surface. Further, no change in the shape of the yarn was observed so as to be visible.

Also, the yarn path roller shown in FIG. 4 is applied to the first guide roller 8 of the traverse guide for the carbon fiber yarn winding winder shown in FIGS. Flat carbon fibers were rolled up to produce a carbon fiber yarn package.
(Flat carbon fiber)
After passing through a treatment bath containing the following sizing agent, a bundle of carbon fibers (carbon fiber yarns) having a surface diameter of 7 μm and having a number of single fibers of 12,000, which have been surface-oxidized in advance, are further heated to 150 to 160 ° C. After passing through the zone heated for several minutes, a bundle of carbon fiber yarns having a yarn width of about 7 mm was obtained.
(Sizing agent)
The following (a), (b), and (c) were charged into a high-viscosity emulsifying apparatus, and heated to 50 to 60 ° C. to be uniform, and 4.5 parts by weight of (d) was added. The mixture was sufficiently stirred and the emulsion was inverted. After phase inversion, 41.5 parts by weight of the remaining (d) was gradually added to obtain a uniform emulsion.
(a) Bisphenol A type epoxy resin (Epicoat (registered trademark) 828 (Japan Epoxy Resin Co., Ltd.)) ... 30 (parts by weight)
(b) Condensate of 2 mol of adduct of bisphenol A with 2 mol of EO, 1.5 mol of maleic acid and 0.5 mol of sebacic acid (acid value 55) ... 20 (parts by weight)
(c) Polyoxyethylene (70 mol) styrenated (5 mol) cumylphenol ... 5 (parts by weight)
(d) Water: 45 (parts by weight)
Here, the outer diameter of the roller main body was set to 30 mm, and the angle θ was changed in a range from -3 ° to + 3 ° during one rotation of the roller main body. The yarn speed was 10 m / min. As a result, the yarn is always held at the same position on the traverse guide, and the yarn position on the bobbin end surface is stabilized, thereby improving the end surface shape of the wound product. Further, no change in the shape of the yarn was observed so as to be visible. That is, in the conventional traverse guide, if there is a displacement due to deflection in the case of a cantilever roller due to the yarn tension or a slight displacement caused due to the mounting accuracy, a displacement of 1 mm is generated on the first guide roller. There has been a problem that even if the deviation is as small as 1 mm, the product shape will be greatly affected if it continues for a long time. However, the yarn guide roller of the present invention is used for the first guide roller 8 shown in FIGS. 7 and 8, and the yarn guide held by the first guide roller 8 is twisted by 90 ° by the second guide roller 9. When a traverse guide for a carbon fiber yarn winding winder having a structure wound around the bobbin 6 is applied, the force is forcibly returned to the center so that the yarn is always held at the same position on the traverse guide. As a result, the yarn position on the bobbin end face was stabilized. As a result of investigating the fluctuation width of the yarn position on the bobbin end face at this time by fixing the close-up photographing camera at the traverse end position as shown in FIG. 9 and continuously photographing, the traverse end reference of the fiber traverse end position was obtained. The deviation from the position could be kept within ± 1 mm. In addition, it was found that the carbon fiber yarn package manufactured by the method of the embodiment and having a small deviation from the traverse end reference position has a significantly improved product disassembly property. In other words, in the conventional product, the deviation from the reference position is often 1 mm or more at the end face of the product, so that the yarn that protrudes from the end face may be caught by the yarn inside it at the time of unraveling, causing twill drop, fluffing, and yarn breakage. However, the package of the present embodiment has a good unwinding property because the variation in the yarn position on the end face is small, so that there is no equipment trouble due to twill dropping or fluff winding at the time of unwinding, and the quality of the fiber is not deteriorated due to yarn breakage. there were.

Further, the carbon fiber yarn package obtained in this example was unwound with a tension of 5 N and a yarn speed of 10 m / min using the apparatus shown in FIG. The measurement was performed with a yarn width measuring device at a sampling period of 1 s for 10 minutes (number of measurements n = 600). As a result, in the fiber yarn package obtained in Example 2, the standard deviation of the yarn width was 0.42, and the average yarn width was 7.1 mm. That is, the dispersion of the released yarn width obtained by dividing the standard deviation of the yarn width by the average value of the yarn width and multiplying by 100 was 5.9%.

(Comparative Example 1)
The same carbon fiber bundle was wound up under exactly the same conditions as in Example 2 except that a conventional traverse guide, that is, a traverse guide in which the guide roller 8 of the traverse guide shown in FIG. Was. As a result, a slight displacement due to the deflection of the roller due to the yarn tension and a slight displacement due to the mounting accuracy affect the first guide roller to produce a displacement of 1 mm unit. Disturbance was confirmed in the package edge shape). Further, the unwound yarn width of this product was measured by the same method as in Example 2 using the apparatus shown in FIG. As a result, in the fiber yarn package obtained in Comparative Example 1, the standard deviation of the yarn width was 0.68, and the average yarn width was 6.34 mm. That is, the variation of the unwound yarn width obtained by dividing the standard deviation of the yarn width by the average yarn width value and multiplying by 100 was 10.7%.

If the yarn width varies as in conventional fiber yarn packages, when arranging yarns in sheet form in the prepreg production process, etc., there is a gap between adjacent yarns, There was a problem that a product of uniform quality could not be obtained, but the carbon fiber yarn unwound from the carbon fiber yarn package of the present example had a reduced yarn width variation, and such a carbon fiber yarn was The quality of prepreg products used as raw materials was greatly improved.

The present invention relates to a yarn path roller that guides and conveys yarns such as natural fiber yarns, synthetic fiber yarns, glass fiber yarns, and carbon fiber yarns, and guides yarns fed from various yarn packages, It is used to transport and change the direction of travel. In addition, the present invention can be used as a yarn path roller in a manufacturing process of various yarns, or can be applied to a traverse guide for a winder, but the application range is not limited to these.

1 is a schematic front view of a yarn path roller according to an embodiment of the present invention. FIG. 2 is a schematic front view of the yarn path roller, showing a state in which yarn is guided using the yarn path roller shown in FIG. 1. FIG. 2 is a schematic front view of the yarn path roller, showing a state in which yarn is guided using the yarn path roller shown in FIG. 1. FIG. 7 is a schematic longitudinal sectional view of a yarn path roller according to another embodiment of the present invention. FIG. 11 is a schematic perspective side view of a yarn path roller according to still another embodiment of the present invention. FIG. 6 is a diagram viewed from a direction A in FIG. 5. It is the schematic which shows application to the traverse guide for carbon fiber winding winders of this invention. It is a detailed enlarged view of the traverse guide in FIG. 7, A is a side view and B is a front view. It is the schematic diagram which showed the measuring method of the yarn path fluctuation in a bobbin end surface. It is the schematic diagram which showed the thread width measuring method at the time of product unraveling.

Explanation of reference numerals

1: roller shaft 2: roller body 2a: roller surface 3: bearing 4: bearing 5: carbon fiber 6: carbon fiber product bobbin 7: traverse guide 8: first guide roller 9: second guide roller 10: close-up photographing Camera (fixed installation)
11: Scale (fixed installation)
12: Laser transmission type yarn width measuring instrument (fixed installation)
13: Winding device

Claims (6)

A roller body having a roller surface, and a roller shaft for supporting the roller body, and a roller such that when rotated, the angle θ of the roller surface with respect to the roller axis changes in the range of θ ₁ to θ _2. A yarn path roller in which the roller surface is oblique to the shaft. The yarn path roller according to claim _1, wherein the angles? _{1 to} ? ₂ are in the range of -10 to +10. A method for producing a carbon fiber yarn using the roller according to claim 1. A traverse guide for winding up a fiber yarn, comprising the roller according to claim 1 or 2. A method for producing a fiber yarn package using the fiber yarn winding traverse guide according to claim 4. A fiber yarn package having a fiber yarn width variation of 10% or less determined under the following conditions while unwinding at a tension of 5 N and an unwinding speed of 10 m / min.
Fiber yarn width variation (%) = (fiber yarn width standard deviation / fiber yarn width average value) × 100
Sampling cycle t: 1 second Number of measurements n: 600

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