JP4332606B2 - Fiber bundle drawing method and fiber bundle drawing device - Google Patents

Description

The present invention relates to a fiber bundle pulling method and a fiber bundle pulling apparatus related to the supply of warp or weft in woven fabric and the supply of a plurality of fiber bundles in the manufacture of a prepreg sheet. Specifically, the present invention relates to a fiber bundle pulling apparatus. The present invention relates to a fiber bundle pulling method and a fiber bundle pulling apparatus for causing a fiber bundle to travel stably without causing bending and twisting in the width direction of the fiber bundle and pulling the fiber bundle in a predetermined pulling direction. Is.

Usually, reinforcing fiber bundles such as carbon fiber bundles and aramid fiber bundles are made by traversing the winding width of a core material (usually a paper tube) while bundling a large number of filaments and attaching a sizing agent. Commercially available as a wound bobbin. The cross section of the fiber bundle is often flat, and the degree of flatness (fiber bundle width / fiber bundle thickness) increases as the number of filaments constituting the fiber bundle increases. It is wound with the twill angle.

In textile weaving using carbon fiber bundles, aramid fiber bundles, etc., fiber bundles drawn from bobbins are often used as warps and wefts. The warp is supplied using a krill stand on which a plurality of bobbins can be arranged, aligning a plurality of fiber bundles at a predetermined interval, and applying a required tension to each fiber bundle. Then, the weft is supplied with a required tension from a predetermined position using a weft supply device.

Also, in the manufacture of unidirectionally reinforced prepreg sheets using carbon fiber bundles, aramid fiber bundles, etc., each fiber bundle is required from multiple bobbins using a krill stand, etc. used for warp supply of woven fabrics. Are pulled out with the required tension applied and supplied to the next step.

In this way, in the case of weaving the fiber bundle into a woven fabric or drawing it into a unidirectionally reinforced sheet material, the fiber bundle is not bent or twisted in the width direction from the bobbin, and the fiber bundle. It is necessary to stabilize the width of the wire and to draw it out to a predetermined position. However, since the fiber bundle wound around the bobbin is wound at a required angle, when the fiber bundle is pulled out from the bobbin, the position where the fiber bundle is unwound from the bobbin reciprocates between the winding widths, and the bobbin The traveling direction of the fiber bundle immediately after being pulled out of the wire changes. Therefore, it becomes very important how the traveling direction of the changing fiber bundle immediately after being drawn out from the bobbin is converged in a predetermined drawing direction by stabilizing the fiber bundle width.

Normally, a creel stand for reinforcing fiber bundles has a mechanism that allows a large number of bobbins to be arranged so that the axis of rotation of the bobbin and the floor surface are substantially horizontal, and each bobbin is loaded with the required tension. A possible mechanism is attached. Further, the traveling direction of each fiber bundle, that is, the yarn path, is forcibly determined by using a guide that regulates the traveling position such as a guide ring. The fiber bundle is said to be untwisted because it is unwound and pulled out by rotating the bobbin, and if it is a non-twisted yarn, it can be supplied to the next process in a non-twisted state.

Further, several methods and apparatuses for drawing out the fiber bundle from the bobbin without causing the fiber bundle to bend and twist in the width direction and stabilizing the width of the fiber bundle have been proposed.

As one of them, in order to align the traveling direction of the fiber bundle drawn from the bobbin toward the winding unit and the bobbin fiber bundle winding direction just before the fiber bundle is unwound from the bobbin, Has been proposed in which the bobbin can be moved back and forth in the direction of the rotation axis in order to keep the position where the fiber bundle is unwound from the bobbin constant (see, for example, Patent Document 1).

As another device, a fiber bundle is pulled out from a vertically arranged bobbin, and the drawn fiber bundle is converted into a direction of approximately 90 degrees in a plan view by a guide roll arranged vertically, and then horizontally There has been proposed a mechanism for guiding a fiber bundle to a predetermined position of a guide roll disposed on the surface (for example, see Patent Document 2).

Furthermore, when weaving a woven fabric, as a device for supplying wefts in a flat state, a device that maintains the flat state of the fiber bundle by bringing the fiber bundle drawn from the bobbin into contact with the convex portion of the bow-shaped guide and guiding it to a predetermined position Has been proposed (see, for example, Patent Document 3).
Japanese Patent No. 3064019 WO 2004/015184 Japanese Patent Laid-Open No. 10-317252

However, in any of the methods and apparatuses, there is a problem in that when the fiber bundle is guided from the bobbin in a predetermined drawing direction, the fiber bundle is contracted in the width, bent in the width direction, or twisted in the fiber bundle. When a conventional krill stand is used, the fiber bundle drawn from each bobbin often passes directly through a guide that regulates the traveling direction of the fiber bundle, such as a guide ring, and is guided in a predetermined drawing direction. FIG. 1 shows a schematic plan view thereof. The fiber bundle 2 pulled out from the bobbin 1 travels through the travel position regulation guides 3 and 3 '. When the fiber bundle 2 is unwound and pulled out from both ends of the bobbin 1, as shown in FIG. The bundle 2 is pressed against the travel position regulation guide 3 or 3 'from the width direction, causing problems such as shrinkage, bending, and twisting of the fiber bundle 2 in the width direction.

By increasing the distance L0 from the bobbin rotation axis to the travel position regulation guide 3, the state in which the fiber bundle 2 is pressed against the travel position regulation guide 3 is alleviated. However, increasing the distance L0 causes the fiber bundle to easily shrink in the width direction, bend, or twist due to the influence of the tensile force acting on the fiber bundle. And the mechanism which lengthens the distance from a bobbin rotating shaft to a travel position control guide raises the problem of increasing the size of the krill stand.

The bobbin is swung so that the traveling direction of the fiber bundle drawn from the bobbin toward the winding unit and the fiber bundle winding direction of the bobbin immediately before unwinding are aligned, and the fiber bundle is unwound from the bobbin. The method of moving the bobbin forward and backward in the direction of the rotation axis in order to maintain a constant position is surely optimal in stabilizing a single fiber bundle to a predetermined position. However, the mechanism for swinging and advancing and retreating the bobbin is complicated and large, and when a creel stand having a plurality of fiber bundles is used, there arises a problem of an increase in the size and cost of the krill stand.

A method of guiding a fiber bundle drawn from a vertically arranged bobbin to a predetermined position of a horizontally disposed guide roll by converting the bundle of fibers into a direction of approximately 90 degrees in a plan view by a vertically arranged guide roll. Certainly, the influence of the traverse when the fiber bundle is unwound from the bobbin can be removed, and the fiber bundle can be stably guided to the guide roll arranged horizontally. However, the fiber bundle has to be inverted by approximately 90 degrees between the guide rolls arranged in a vertical manner and the guide rolls arranged in a horizontal manner. Thereby, there is a problem that the fiber bundle is twisted and the twist is supplied to the next process. In addition, since a mechanism unit that vertically arranges the bobbin and a mechanism unit that changes the direction of the fiber bundle by approximately 90 degrees in plan view are required, when the krill stand is arranged with a plurality of fiber bundles, The problem of increasing the size also arises.

  For the device that guides the fiber bundle drawn from the bobbin to the convex position of the arcuate guide to maintain the flat state of the fiber bundle and guides it to a predetermined position, the flatness of the fiber bundle is certainly due to the effect of the convex part of the arcuate guide. The state is maintained and the fiber bundle is pulled out. However, after the contact of the arcuate guide, the process up to the yarn path regulation guide is as shown in FIG. 1, and no special method or apparatus is used. In other words, once flattened flat yarn that has been flattened and unwound causes problems such as shrinkage in the width direction due to tension load between the arcuate guide and the yarn path regulation guide, and pressing against the yarn path regulation guide from the width direction. is there. In order to solve this problem, a method of increasing the distance from the arcuate guide to the yarn path regulating guide is shown. However, since this device is basically a weft supply device of a weaving device, there is no problem in increasing the distance to the yarn path regulation guide, but it is used for a creel stand in which a plurality of bobbins are arranged. This creates the problem of increasing the size of the crill stand.

The present invention has been made in view of the above problems, the purpose of which is to run a fiber bundle drawn from a bobbin with a stable fiber bundle width without causing bending and twisting in the width direction, and It is an object of the present invention to provide a fiber bundle drawing method and a fiber bundle drawing apparatus that can converge a changing fiber bundle traveling direction immediately after being drawn out from a bobbin in a predetermined drawing direction at a short distance.

The invention according to claim 1 is a fiber bundle pulling method for pulling a fiber bundle from a bobbin in a predetermined pulling direction substantially orthogonal to the rotation axis of the bobbin, and a plurality of the fiber bundles pulled out from the bobbin. The guide fiber formed into a concave curved shape is brought into contact with the guide surface in order of decreasing curvature radius, and the fiber bundle is gradually moved in the direction near the concave center portion of the guide surface, while the fiber is moved. In the fiber bundle drawing method, the bundle traveling direction is bundled in the drawing direction.

  The invention according to claim 2 is the invention according to claim 1, wherein the fiber bundle is a flat fiber bundle having a fiber bundle width / fiber bundle thickness ratio of 20 or more and a fiber bundle width of 2 mm or more, or a fiber bundle. The fiber bundle is characterized by being a spread fiber bundle that has been subjected to a fiber opening treatment such that the ratio of width / fiber bundle thickness is 20 or more and the fiber bundle width is 4 mm or more.

The invention according to claim 3 is a fiber bundle drawing device for drawing a fiber bundle from a bobbin in a predetermined drawing direction substantially orthogonal to the rotation axis of the bobbin, and upstream of a travel path of the fiber bundle drawn from the bobbin. toward the downstream from the pull-out direction and is curved concave in the direction you substantially orthogonal, a plurality of guide surfaces for moving gradually toward the vicinity of the concave central portion of the guide surface of the fiber bundle, the guide surface The fiber bundle drawing device is characterized by being arranged in order of decreasing curvature radius.

  The invention according to claim 4 is the invention according to claim 3, characterized in that a plurality of the guide surfaces are arranged at a predetermined interval in order of decreasing curvature radius of the guide surfaces.

  The invention according to claim 5 is the invention according to claim 3 or 4, characterized in that the guide surface is formed by a curved guide obtained by bending a rod member having a circular cross section into a concave shape.

  The invention according to claim 6 is the invention according to claim 3 or 4, characterized in that the guide surface is formed by a curved roll curved in a drum shape.

  The invention according to claim 7 is the invention according to any one of claims 3 to 6, wherein either a fixed type or a rotary type is provided between the bobbin and the first guide surface. One or more guide rolls are arranged.

  The invention according to claim 8 is the invention according to any one of claims 3 to 7, wherein a plurality of fiber bundle drawing devices are arranged, and a plurality of fiber bundles are arranged from each predetermined position to each predetermined position. It is characterized by pulling in the direction of pulling out.

In the present invention, the fiber bundle drawn from the bobbin is caused to run in contact with a plurality of concavely curved guide surfaces in order of decreasing curvature radius of the guide surface. The fiber bundle travels with a stable fiber bundle width without causing bending or twisting in the width direction while gradually moving in the direction near the portion, and the traveling direction of the fiber bundle is short from the bobbin. It can be bundled in a predetermined pull-out direction at a distance.

Further, the fiber bundle drawing device according to the present invention is formed in a concave shape in a direction substantially perpendicular to the drawing direction of the fiber bundle, and the fiber bundle is gradually moved toward the direction near the concave center portion of the guide surface. A plurality of guide surfaces to be driven are arranged from the upstream to the downstream of the travel path of the fiber bundle, and arranged at a required interval in order of decreasing curvature radius of the guide surface, so that the fiber bundle drawn from the bobbin It becomes a miniaturized device that converges in a predetermined drawing direction while stabilizing the fiber bundle width without causing bending or twisting in the width direction.

  Hereinafter, the content of the present invention will be described in more detail with reference to the accompanying drawings which exemplarily show preferred forms when the present invention is specifically implemented.

[First Embodiment]
A first embodiment embodying the present invention will be described below with reference to FIGS. 1st Embodiment uses the example of an apparatus which employ | adopted the curved guide which curved the circular cross-section-shaped rod member as the member which forms a guide surface, ie, a guide surface formation member, and the running direction of the fiber bundle pulled out from the bobbin Is shown with respect to a method of converging in a predetermined drawing direction. 2 is a schematic perspective view of a fiber bundle drawing device according to the present invention, FIG. 3 is a schematic plan view of the fiber bundle drawing device, FIG. 4 is a schematic side view of the fiber bundle drawing device, and FIG. 5 is a fiber traveling on a guide surface. FIG. 6 is a schematic diagram related to a bundle, and FIG. 6 is a schematic diagram related to a guide surface formed by a curved guide and a curved roll.

2 to 4 includes a bobbin 1, a horizontal guide roll 4, guide surfaces 7 and 8, a horizontal guide roll 5, and travel position regulation guides 3, 3 '. The guide surfaces 7 and 8 are formed by curved guides 20 and 21 obtained by bending a rod member having a circular cross section into a concave shape.

Here, the bobbin 1 means a state in which a fiber bundle is wound around a core material (usually a paper tube) at a certain angle. The fiber bundle used is a thermoplastic resin fiber bundle such as polyethylene, polypropylene, nylon 6, nylon 66, nylon 12, polyethylene terephthalate, polyphenylene sulfide, and polyetheretherketone, which are used for clothing and industrial applications. There are reinforcing fiber bundles such as carbon fiber bundles, glass fiber bundles, aramid fiber bundles and ceramic fiber bundles used for reinforcing fibers of composite materials.

The present invention relates to a method and an apparatus for causing a fiber bundle drawn from a bobbin to travel while stabilizing the fiber bundle width without causing bending or twisting in the width direction and to converge the traveling direction of the fiber bundle in a predetermined drawing direction. Is. Therefore, although it can be applied to both clothing and industrial fiber bundles, it is important to supply the fiber bundles to the next process while maintaining the untwisted state and fiber straightness of the fiber bundles. It is an optimal method and apparatus for the withdrawal of the camera.

The bobbin 1 is attached to a brake mechanism (not shown), a constant tension feed mechanism, or the like, and is a mechanism that unwinds the fiber bundle by rotating the bobbin. In other words, the fiber bundle is unwound and pulled out by rotating the bobbin, so that the fiber bundle can be pulled out without being twisted and loaded with a certain tension.

After the fiber bundle 2 drawn out from the bobbin 1 contacts the horizontal guide roll 4, the fiber bundle 2 travels in contact with the guide surfaces 7 and 8 formed by the curved guides 20 and 21 in order, passes through the horizontal guide roll 5, and then the fibers The travel direction of the bundle is converged in a predetermined drawing direction P and supplied to the next process. Here, the convergence of the traveling direction of the fiber bundle to the predetermined pulling direction means that the traveling direction of the fiber bundle is substantially matched to the predetermined pulling direction.

The fiber bundle 2 to be pulled out from the bobbin 1 when a tensile force is applied is unwound from the point A of the bobbin 1, but the fiber bundle 2 is wound around the bobbin 1 with the winding width W. Reciprocates in a section of length W in parallel with the direction of the rotation axis of the bobbin. Therefore, as shown in FIG. 1, when the fiber bundle 2 is guided directly from the bobbin 1 to the travel position regulation guides 3 and 3 ', the fiber bundle 2 is travel position regulation except when the point A is on the point B. It contacts the guides 3 and 3 'and is pressed from the width direction. However, as shown in FIGS. 2 to 4, when traveling on the guide surfaces 7 and 8 that are concavely curved in a direction substantially orthogonal to the predetermined pulling direction P, as shown in FIG. 5, they are curved in a concave shape. From this effect, it is considered that the fiber bundle 2 travels while moving in the direction of the concave center portion of the guide surface due to the force F that tends to move to the concave center portion.

Therefore, by providing a plurality of guide surfaces so that the curvature radius of the guide surface becomes smaller in order, and causing the fiber bundle 2 to contact and travel in order, the fiber bundle 2 can stabilize the fiber bundle width without causing bending or twisting in the width direction. As a result, it gradually converges near the center of the guide surface curved in a concave shape, and as a result, the traveling direction of the fiber bundle 2 can substantially coincide with the predetermined pulling direction P. That is, the traveling direction of the fiber bundle 2 is converged in a predetermined drawing direction. In contrast, when the conventional method or apparatus is provided with only one guide surface having a small curvature radius, that is, only one guide ring having a small curvature radius, the fiber bundle is affected by the guide surface having an extremely small curvature radius. This causes shrinkage in the width direction of the receiver and fiber bundle, bending, twisting, and the like.

Here, when the fiber bundle travels with the width of the fiber bundle stabilized without causing bending or twisting in the width direction, the state of the traveling fiber bundle is substantially the same as the state of the yarn wound around the bobbin. is there. That is, the traveling fiber bundle does not bend or twist in the width direction. As for the fiber bundle width, the traveling fiber bundle is loaded with a required amount of tension, so that some width shrinkage occurs, but the shrinkage width is the original width (the width of the fiber bundle wound around the bobbin). ) And the fiber bundle width is almost constant and stable.

The guide surfaces are arranged at a required interval. Here, the required interval means that the fiber bundle drawn from the bobbin can travel with the fiber bundle width stabilized without causing bending or twisting in the width direction. It is an interval.

The distance between the guide surfaces is also related to the difference in curvature of the guide surfaces. When a plurality of guide surfaces are arranged, if the difference in curvature between the front and rear guide surfaces is small, the fiber bundle travels with a stable width even if the distance between the guide surfaces is set to a relatively short distance. be able to. However, when there is a large difference in curvature between the front and rear guide surfaces, the distance between the guide surfaces is increased to some extent, thereby stabilizing the fiber bundle without causing excessive force to shrink the fiber bundle in the width direction. Thus, it can be converged in the vicinity of the central portion of the guide surface which is gradually curved in a concave shape. In other words, by appropriately setting the curvature of the guide surface and the distance between the guide surfaces, it is possible to set a short distance until the fiber bundle drawn from the bobbin converges in a predetermined drawing direction.

For example, as shown in FIG. 6, the guide surface formed in a concave shape is formed by using a curved guide in which a circular cross-section bar member is formed in a concave shape, a curved roll formed in a drum shape, or the like. Is done. The guide surface has a circular shape as shown in FIGS. 6A and 6D, an elliptical shape as shown in FIGS. 6B and 6E, and FIG. It is preferable that the concave center as shown in (c) and (f) is circular and the both ends of the concave are linear. However, any shape may be used as long as it has a concavely curved shape that has the effect of moving the fiber bundle to the concave center without causing shrinkage, bending, twisting, or the like in the fiber bundle. In any case, as shown in FIG. 6, a virtual circle having a center o and a radius r along the guide surface is drawn, and the radius r of the drawn virtual circle is set as a curvature radius r of the guide surface.

The present invention is characterized in that a plurality of guide surfaces are arranged in order of decreasing curvature radius of the guide surfaces. The curvature of the guide surfaces to be arranged, the number of guide surfaces, the distance between the guide surfaces, etc. are related to the width of the fiber bundle, the sticking property of the fiber bundle by the sizing agent, the ease of sliding of the guide surface, etc. As a result of investigations by the inventors, it is preferable that the curvature radius of the guide surface is 10 mm to 300 mm, the number of guide surfaces is 2 to 4, and the distance between the guide surfaces is 30 to 300 mm. When the radius of curvature is 10 mm or less, shrinkage or the like in the width direction of the fiber bundle is likely to occur, and when the radius of curvature exceeds 300 mm, it is difficult to obtain the effect of converging the fiber bundle to the concave center portion. When the number of guide surfaces is increased or the distance between the guide surfaces is increased, the fiber bundle is easily contracted in the width direction, and the size of the fiber bundle drawing device is increased.

In the case of an apparatus in which two guide surfaces shown in FIG. 2 to FIG. 4 are arranged, the radius of curvature of the guide surface 7 on the upstream side in the fiber bundle traveling direction is in the range of 40 mm to 100 mm and the guide surface 8 on the downstream side. The curvature radius is preferably provided in the range of 10 mm to 30 mm. When the radius of curvature of the most downstream guide surface is in the range of 10 mm to 30 mm, the fiber bundle 2 is converged to the vicinity of the concave center without stabilizing the width of the fiber bundle without bending and twisting. This makes it possible to travel substantially in the pulling direction P.

The distance L1 from the bobbin 1 to the horizontal guide roll 4, the distance L2 from the horizontal guide roll 4 to the guide surface 7, the distance L3 between the guide surfaces 7 and 8, and the distance L4 between the guide surface 8 and the horizontal guide roll 5 are 30. It is preferable to provide the fiber bundle 2 in a range of ˜100 mm because the fiber bundle 2 does not bend and twist, and the fiber bundle width can be stably traveled, and the fiber bundle drawing device can be downsized.

2 to 4, a rotary or fixed horizontal guide roll 4 is provided between the bobbin 1 and the first guide surface 7. By providing the horizontal guide roll 4, the fiber bundle 2 drawn out from the bobbin 1 can come into contact with the guide surfaces 7 and 8 in order, as can be understood from the schematic side view of FIG. 4. Further, even when the winding diameter of the bobbin 1 is changed and the position A where the fiber bundle 2 is unwound from the bobbin 1 is changed, the fiber bundle 2 is moved to the guide surfaces 7 and 8 in order by the effect of the horizontal guide roll 4. It can be touched. Depending on the arrangement of the bobbin 1 and the guide surfaces 7 and 8, the horizontal guide roll 4 may not be necessary.

In FIGS. 2 to 4, a curved guide in which a rod member having a circular cross-sectional shape is curved in a concave shape is used as the guide surface forming member that forms the guide surface. By using a curved guide having a circular cross-sectional shape, when the fiber bundle 2 travels in contact with the guide surface, the fiber bundle 2 can travel in a curved portion in the fiber bundle traveling direction. The tension load can be prevented, and as a result, the effect of suppressing the fluffing of the fiber bundle can be obtained. In order to further prevent fluffing of the fiber bundle, it is preferable that the guide surface is subjected to a surface treatment having a low frictional resistance with the fiber bundle, such as a surface plating treatment.

In the present invention, a fiber bundle drawn out from a bobbin is brought into contact with a plurality of concavely curved guide surfaces in order of decreasing curvature of the guide surface, whereby the fiber bundle is bent and twisted in the width direction. The fiber bundle width can be made to travel stably without being generated, and the traveling direction of the fiber bundle can be converged in a predetermined drawing direction. Since the number of guide surfaces, the curvature of guide surfaces, the distance between guide surfaces, and the like can be set, various fiber bundle widths can be handled. Even for fiber bundles with large flatness and spread fiber bundles, the fiber bundle is moved to the concave center by setting the curvature of the final guide surface arranged on the most downstream side in the fiber bundle traveling direction to be large. It is possible to make the fiber bundle run more stably while being converged.

In other words, a flat fiber bundle having a large flatness as a raw yarn, for example, a flat fiber bundle having a fiber bundle width / fiber bundle thickness ratio of 20 or more and a fiber bundle width of 2 mm or more, or an open fiber processed by spreading the raw yarn into a wide and thin state. A fiber bundle, for example, a bobbin around which a fiber bundle width / fiber bundle thickness ratio of 20 or more and an opened fiber bundle having a fiber bundle width of 4 mm or more is wound, It is possible to converge in a predetermined drawing direction while stabilizing the width.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIG. The second embodiment uses a device example in which the guide surface is formed by a curved roll curved in a drum shape toward the roll rotation axis, that is, in a concave shape, and uses a predetermined pull-out direction of the fiber bundle drawn from the bobbin. It shows about the method of making it converge in a direction.

The fiber bundle drawing device 25 shown in FIG. 7 includes the bobbin 1, the bending rolls 29, 30 and 31, the horizontal guide roll 5, and the travel position regulation guides 3, 3 '. The guide surfaces 15, 16 and 17 are formed by curved rolls 29, 30 and 31.

As in the first embodiment, the bobbin 1 is attached to a brake mechanism (not shown), a constant tension feeding mechanism, or the like, and the fiber bundle drawn from the bobbin 1 is in a state in which a certain tension is applied and twisted. Drive without joining.

The fiber bundle 2 drawn from the bobbin 1 converges in a predetermined drawing direction P after passing through the horizontal guide roll 5 by sequentially contacting the guide surfaces 15, 16 and 17 formed by the curved rolls 29, 30 and 31. Then, it is supplied to the next process.

Unlike 1st Embodiment, the guide surface is installed in three places. As an effect of increasing the number of guide surfaces, it is possible to further reduce the magnitude of the force F acting on one guide surface and forcing the fiber bundle to move toward the concave center. This effect can more effectively prevent bending and twisting of the fiber bundle in the width direction.

Further, the bending roll can be selected from either a rotary type or a fixed type. In the case of the rotary type, the tension on the fiber bundle caused by the fiber bundle traveling in contact with the curved roll can be greatly reduced. That is, by selecting a rotary type or a combination of a rotary type and a fixed type, the fiber bundle can be converged in a predetermined drawing direction with low tension and stability.

In the case of FIG. 7, as a result of examination by the present inventors, the radius of curvature of the guide surface 15 is in the range of 150 mm to 300 mm, the radius of curvature of the guide surface 16 is in the range of 40 mm to 100 mm, and the radius of curvature of the guide surface 17 is It is preferable to provide in the range of 10 mm to 30 mm. And it is preferable to provide in the range of 5-30 mm in the diameter of the rotating shaft orthogonal direction in the curve center part of a bending roll. The diameter in the direction perpendicular to the rotation axis at both ends of the bending roll is set by determining the diameter in the direction perpendicular to the rotation axis of the bending center, the length in the rotation axis direction of the bending roll, and the radius of curvature of the guide surface. Furthermore, in order to prevent fluffing of the fiber bundle, it is preferable that the guide surface is subjected to a surface treatment having a low frictional resistance with the fiber bundle, for example, a ground plating treatment, as in the case of the curved guide.

Embodiments using a curved guide and a curved roll as the guide surface forming member have been described. However, any member that includes a guide surface curved in a concave shape can be used as a guide surface forming member. For example, as shown to Fig.8 (a), you may be the member (guide surface formation member 32) which has the guide surface 18 curvedly formed concavely in the end surface with a metal mold block. Also, a plurality of guide surface forming members 32 whose length in the fiber bundle traveling direction is made as short as possible are prepared, and the guide surfaces 18 are arranged in the order in which the curvature radius of the guide surface 18 is gradually reduced (that is, the difference in curvature radius is eliminated). And if the distance between each guide surface formation member 32 is shortened as much as possible, the guide surface formation member 33 as shown in FIG.8 (b) can be obtained. The guide surface forming member 33 has a configuration in which the radius of curvature on the upstream side in the fiber bundle traveling direction is large and the radius of curvature on the downstream side is small. By making the upstream guide surface and the downstream guide surface continuous, the radius of curvature is increased. A continuous surface (guide surface 19) curved in a concave shape that gradually decreases is formed.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIG. The third embodiment is an example in which a plurality of fiber bundle drawing devices 25 of the first embodiment are arranged, and shows a method for drawing a plurality of fiber bundles in a predetermined drawing direction.

9, a fiber bundle pulling device 34 for pulling out a plurality of fiber bundles in each predetermined pulling direction has a total of 32 fiber bundle pulling devices 25 arranged in four rows in the height direction and eight rows in the length direction. An example is shown. Each fiber bundle drawing device 25 includes a bobbin 1, a horizontal guide roll 4, curved guides 20 and 21, a horizontal guide roll 5, and travel position regulation guides 3, 3 '. Each fiber bundle 2 drawn out from each fiber bundle pulling device 25 changes its traveling direction by the horizontal guide roll 6, proceeds in the fiber bundle traveling direction P ′, and is supplied to the next step.

As in the first and second embodiments, the bobbin 1 is attached to a brake mechanism (not shown), a constant tension feeding mechanism, or the like, and the fiber bundle drawn from the bobbin 1 is in a state where a certain tension is applied. And it is designed to run in a state where no twist is applied.

By using the fiber bundle drawing device 34 according to the present invention, a plurality of fiber bundles are aligned at a certain interval, and the fiber bundle width is stabilized without causing bending or twisting in the width direction of each fiber bundle. And can be supplied to the next process. In other words, in the warp supply in woven fabric and the supply of a plurality of fiber bundles in the manufacture of the prepreg sheet, the fiber bundle can be pulled out and maintained in a flat state.

Although FIG. 9 shows an example of a fiber bundle drawing device using two curved guides, a fiber bundle drawing device employing a curved roll or the like other than the curved guide is used to form a guide surface. It doesn't matter. Furthermore, the apparatus 34 may be configured by using a fiber bundle drawing apparatus provided with three or more guide surfaces.

  Next, specific examples will be described.

"Example 1"
Using a fiber bundle drawing device employing the curved guide shown in FIG. 2, the carbon fiber bundle was drawn in a predetermined drawing direction from the bobbin around which the carbon fiber bundle was wound. As the bobbin wound with the carbon fiber bundle, a bobbin wound with a carbon fiber bundle 24K (Torayca T800SC-10E, manufactured by Toray Industries, Inc.) in which 24,000 single fibers having a single yarn diameter of about 5 μm were bundled was used. A brake mechanism (not shown) was attached to the bobbin, and the tension in the fiber bundle was applied and pulled out.

The guide surface of the curved guide is circular as shown in FIG. 6A, and the radius of curvature of the guide surface 7 on the upstream side in the traveling direction of the fiber bundle is 60 mm, and the radius of curvature of the guide surface 8 on the downstream side is 10 mm. Set. The distance from the bobbin to the horizontal guide roll 4 is 50 mm, the distance from the horizontal guide roll 4 to the curved guide 20 is 50 m, the distance from the curved guide 20 to the curved guide 21 is 50 mm, and the distance from the curved guide 21 to the horizontal guide roll 5 is The distance was set to 30 mm. The traveling speed of the fiber bundle was set to 15 m / min.

  When the fiber bundle is pulled out, the carbon fiber bundle is bent in the width direction, does not twist, and travels with the fiber bundle width stabilized without being pressed against the travel position regulation guides 3 and 3 ′. It was confirmed that it converged in a predetermined pull-out direction. The carbon fiber bundle wound around the bobbin had a width of about 7 mm immediately after being pulled out, but the carbon fiber bundle just after passing through the horizontal guide roll 5 has a width of about 7 mm, and the width direction of the fiber bundle It was confirmed that the fiber bundle could be pulled out stably with almost no shrinkage. In addition, when the tension | tensile_strength which acts on the fiber bundle after passing the horizontal guide roll 5 was measured, it was about 100g, and the value hardly fluctuated during the travel of the fiber bundle. That is, it was confirmed that the fiber bundle can run in a stable tension state regardless of where the fiber bundle is unwound and pulled out at the center or both ends of the bobbin.

"Example 2"
Using a fiber bundle drawing device 25 that employs the bending roll shown in FIG. 7, the carbon fiber bundle was drawn in a predetermined drawing direction from the bobbin around which the carbon fiber bundle was wound. As the bobbin wound with the carbon fiber bundle, a bobbin wound with a carbon fiber bundle 15K (Pyrofil TR50S-HH, manufactured by Mitsubishi Rayon Co., Ltd.) in which 15,000 single fibers having a single yarn diameter of about 7 μm were bundled was used. A brake mechanism (not shown) was attached to the bobbin, and the tension in the fiber bundle was applied and pulled out.

The guide surface of the bending roll is circular as shown in FIG. 6 (d), the radius of curvature of the guide surface 15 on the upstream side in the traveling direction of the fiber bundle is 240 mm, the radius of curvature of the guide surface 16 is 60 mm, and the most downstream side. The curvature radius of a certain guide surface 17 was set to 10 mm. In addition, the diameter of the central portion of each of the three curved rolls was 20 mm, and the three rolls were freely rotated. The distance from the bobbin 1 to the bending roll 29, the distance from the bending roll 29 to the bending roll 30, and the distance from the bending roll 30 to the bending roll 31 are all 50 mm, and the distance from the bending roll 31 to the horizontal guide roll 5 is Set to 30 mm. The traveling speed of the fiber bundle was set to 20 m / min.

  When the fiber bundle was pulled out, the carbon fiber bundle was bent in the width direction and twisted in the same manner as in Example 1, and the width was stabilized without being pressed against the travel position regulation guides 3 and 3 ′. It was confirmed that the car would run. As in Example 1, the result was that the shrinkage in the width direction of the fiber bundle was small and the tension acting on the running fiber bundle was stable.

"Comparative Example 1"
2, a horizontal guide roll similar to the horizontal guide roll 4 is provided in place of the curved guides 20 and 21, and the carbon fiber bundle is drawn in a predetermined drawing direction from the bobbin around which the carbon fiber bundle is wound. We carried out drawing. As a bobbin wound with a carbon fiber bundle, a bobbin wound with a fiber bundle 24K (Torayca T800SC-10E, manufactured by Toray Industries, Inc.) was used as in Example 1. A brake mechanism (not shown) was attached to the bobbin, and the tension in the fiber bundle was applied and pulled out.

The distance from the bobbin to the horizontal guide roll 4 and the distance between the horizontal guide rolls were set to 50 mm. The traveling speed of the fiber bundle was set to 15 m / min.

  When the fiber bundle is pulled out, the position of the carbon fiber bundle passing through each horizontal guide roll also reciprocates in the length direction on the roll as the unwinding position of the carbon fiber bundle moves on the bobbin. . The reciprocation distance becomes shorter as the horizontal guide roll is located downstream in the fiber bundle traveling direction, but the fiber bundle does not converge at a predetermined position in the horizontal guide roll 5 and the length direction on the horizontal guide roll. Go back and forth. Due to this influence, the fiber bundle was pressed against the travel position regulation guides 3 and 3 ′, resulting in the fiber bundle being contracted in the width direction, bent, and twisted.

With the fiber bundle drawing method and fiber bundle drawing apparatus of the present invention, the fiber bundle unwound and drawn out from the bobbin is caused to travel in a state where the fiber bundle width is stabilized without causing bending or twisting in the width direction. Can be converged in the direction of pulling out. Thereby, the process in a next process is attained, maintaining the flat state and untwisted state of a fiber bundle. Furthermore, by arranging and configuring a large number of fiber bundle drawing devices of the present invention, a large number of fiber bundles can be drawn at a certain interval and supplied to the next step while maintaining a flat state and a non-twisted state. That is, it can be used for supplying warp for weaving a woven fabric that requires a flat state and a non-twisted state of the fiber bundle, or supplying a fiber bundle for manufacturing a prepreg sheet. And good quality fabrics or products such as prepreg sheets can be obtained.

FIG. 6 is a schematic plan view relating to a conventional method for guiding a fiber bundle unwound and drawn from a bobbin in a predetermined drawing direction. 1 is a schematic perspective view of a fiber bundle drawing device according to a first embodiment of the present invention. 1 is a schematic plan view of a fiber bundle drawing device according to a first embodiment of the present invention. It is a model side view of the fiber bundle drawer apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram which concerns on the fiber bundle which drive | works a guide surface. It is a schematic diagram which concerns on the guide surface which a curved guide and a curved roll form. It is a model perspective view of the fiber bundle extraction apparatus which concerns on 2nd Embodiment of this invention. It is a model perspective view of the guide surface formation member which formed the guide surface in the metal mold | die block end surface. It is a model side view of the fiber bundle extraction apparatus which concerns on 3rd Embodiment of this invention.

Explanation of symbols

1: Bobbin 2: Fiber bundle 3, 3 ': Travel position regulation guides 4-6: Horizontal guide rolls 7-19: Guide surfaces 20-24: Curved guide 25: Fiber bundle pulling devices 26-31: Curved rolls 32-33 : Guide surface forming member 34 by mold block: fiber bundle drawing device A for drawing a plurality of fiber bundles in each predetermined drawing direction A: position where fiber bundle is unwound from bobbin B: position where fiber bundle is unwound The point P when the parallel line of the fiber bundle pull-out direction P and the parallel line of the bobbin rotation axis are orthogonal to each other: P: predetermined pull-out direction P ′: fiber bundle travel direction F: center of the guide surface curved in a concave shape Force L0 to move to the portion L: Distance from the bobbin rotation axis to the travel position regulation guide L1: Distance from the bobbin rotation axis to the horizontal guide roll L2: From the horizontal guide roll to the guide surface upstream in the fiber bundle travel direction Separation L3: Distance between the guide surfaces L4: Distance from the guide surface downstream in the fiber bundle traveling direction to the horizontal guide roll W: Winding width of the fiber bundle wound around the bobbin o: Center point r of virtual circle curvature radius

Claims (8)

In a fiber bundle drawing method for drawing a fiber bundle from a bobbin in a predetermined drawing direction substantially perpendicular to the rotation axis of the bobbin, the fiber bundle drawn from the bobbin is guided in a plurality of concave shapes. the surface is contacted run in the order in which the radius of curvature becomes smaller in the guide surface, hold such moves gradually toward the vicinity of the concave central portion of the guide surface of the fiber bundle, the drawing direction of the running direction of the fiber bundle A method of pulling out a fiber bundle, characterized by converging into a fiber.   The fiber bundle is a flat fiber bundle having a fiber bundle width / fiber bundle thickness ratio of 20 or more and a fiber bundle width of 2 mm or more, or a fiber bundle width / fiber bundle thickness ratio of 20 or more and a fiber bundle width of 4 mm or more. 2. The fiber bundle drawing method according to claim 1, wherein the fiber bundle is a treated spread fiber bundle. A fiber bundle pulling device for pulling a fiber bundle from a bobbin in a predetermined pulling direction substantially orthogonal to the rotation axis of the bobbin, from upstream to downstream of a travel path of the fiber bundle drawn from the bobbin; A plurality of guide surfaces are formed in a concave shape in a direction substantially perpendicular to the pulling direction, and the fiber bundle is gradually moved in the direction near the concave center portion of the guide surface, and the radius of curvature of the guide surface decreases in order. A fiber bundle drawing device characterized by being arranged.   4. The fiber bundle drawing device according to claim 3, wherein a plurality of the guide surfaces are arranged at a predetermined interval in order of decreasing curvature radius of the guide surfaces.   The fiber bundle drawing device according to claim 3 or 4, wherein the guide surface is formed by a curved guide obtained by bending a rod member having a circular cross-sectional shape into a concave shape.   The fiber bundle drawing device according to claim 3 or 4, wherein the guide surface is formed by a curved roll curved in a drum shape.   The fiber according to any one of claims 3 to 6, wherein one or more horizontal guide rolls, which are either fixed type or rotary type, are arranged between the bobbin and the first guide surface. Bundle drawer device. A plurality of fiber bundle drawing devices according to any one of claims 3 to 7, wherein a plurality of fiber bundles are drawn from each predetermined position in each predetermined drawing direction. .

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