JP2021110056A - Method of producing carbon fiber sliver - Google Patents

Abstract

To provide a method of producing a carbon fiber sliver that scarcely causes dropping off, breakage, or the like, of fibers and can easily form the sliver consisting only of carbon fibers from which a spun yarn having a desired size can be obtained when being spun.SOLUTION: A method of producing a carbon fiber sliver forms a sliver consisting only of carbon fibers 1a by arraying carbon fiber bundles 1 parallel via a carding machine 3, aggregating the bundles into a string, and twisting the string. The carbon fiber bundles are cut into pieces having a size such that drafting can be applied when being spun. The carding machine is a pin carding machine 3P including: a taker-in roller 32 that presses down the carbon fiber bundles downward with pin needles 321; a cylinder 33 that rotates at a rotation speed v2 faster than that of the take-in roller and pushes up the carbon fiber bundles upward with pin needles 331 while arraying the carbon fiber bundles parallel; a block body 34 that restricts a passage of the carbon fiber bundles in a boundary part between the two (the take-in roller and the cylinder); and a calender roller 36 that presses and hardens the carbon fiber bundles that are received on a downside and aggregated.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing a carbon fiber sliver. More specifically, the present invention arranges linear carbon fiber bundles cut to a predetermined length in parallel and twists them to form a sliver consisting of only carbon fibers. The present invention relates to a method for producing a carbon fiber sliver.

Since carbon fiber has characteristics of light weight and high strength, it has been used as carbon fiber reinforced plastic (CFRP) in aircraft fuselage, automobile parts, and the like in recent years. The strength of this carbon fiber reinforced plastic is exhibited by, for example, immersing laminated woven carbon fibers in a resin and hardening the spaces between the fibers with a resin. Then, in order to form the woven carbon fiber, a technique for producing a carbon fiber sliver that can be processed into spun yarn for forming woven fabrics of various shapes is required.

For example, Patent Document 1 discloses the following method for producing a carbon fiber sliver. That is, as shown in FIG. 4, it is a method for producing a sliver containing carbon fibers, in which raw cotton 101 containing synthetic fibers and / or natural fibers is put into a card machine 102 to form a band-shaped fleece 103. A forming step, a carbon fiber opening step of kneading and opening the bundled carbon fibers 104, a carbon fiber supply step of supplying the carbon fibers 104a opened on the surface of the fleece 103, and the carbon A method for producing a carbon fiber sliver is disclosed, which comprises a sliver forming step in which the fleece 103 to which the fibers 104a is supplied is put into a card machine 105 to form a sliver 106. Here, the bundled carbon fiber 104 is shown as a bundle of a large number of short fibers having a length of about 5 to 15 cm.

Further, in the sliver forming step, the surface of the feed roller 105a that feeds the fleece 103, the takein 105b that scrapes the fleece 103 from the feed roller 105a with a wire needle planted on the surface, and the takein 105b due to the difference in surface speed. A cylinder 105d that receives the fibers of the takein 105b and combs the fibers with the walker roller 105c with a wire needle planted in the cylinder 105d, a doffer 105e that receives the fibers combed by the cylinder 105d and takes them out as a fleece, and a doffa 105e. A card machine (general metallic card machine) 105 including a calendar roller 105f that converges the fleece taken out from the sliver 106 to form a sliver 106 is disclosed.

Japanese Unexamined Patent Publication No. 2016-108684

However, the method for producing a carbon fiber sliver disclosed in Patent Document 1 has the following problems. That is, in the above method for producing the carbon fiber sliver, in the carbon fiber supply step, the carbon fiber 104a that has been kneaded and opened in advance is supplied to the surface of the fleece 103 made of raw cotton 101 containing synthetic fibers and / or natural fibers. Since the method is to put the sliver into the card machine 105 in the sliver forming step, the sliver 106 is not a sliver made of only carbon fibers. Therefore, the sliver 106 has a problem that the lightweight and high-strength characteristics of the carbon fiber cannot be sufficiently exhibited.

Further, in the sliver forming step, since the carbon fibers 104a are wrapped with the fleece 103, the carbon fibers 104a are difficult to fall off from the card machine 105, but when forming a sliver made of only carbon fibers, the carbon fibers are formed with the fleece. There was a problem that the carbon fiber could not be wrapped and the carbon fiber fell off from the card machine.

In addition, since carbon fibers have no crimping property and the surface is slippery, it is difficult to entangle with each other even if twisted only with carbon fibers composed of short fibers having a length of about 5 to 15 cm. Even if a sliver made of the same material is formed, it is easily melted and separated, and there is a problem that it is not possible to obtain a spun yarn of a required size at the time of spinning.

On the other hand, in order to obtain spun yarn from the sliver, it is necessary to stretch the fibers by drafting the sliver, and in that case, the length corresponding to the distance between the front roller and the back roller for drafting the sliver. It was necessary to cut the carbon fibers (for example, a length of about 30 to 100 cm). However, when the carbon fiber has a length of about 30 to 100 cm, a general metallic card machine is provided with a wire needle that is densely formed like a saw blade, so that the carbon fiber is caught by the saw blade of the wire needle. There is also a problem that the broken carbon fibers are easily broken and the broken carbon fibers are easily entangled and formed into a nep.

The present invention has been made to solve the above problems, and an object of the present invention is only carbon fibers which are less likely to cause fibers to fall off or break and can obtain spun yarn of a required size at the time of spinning. An object of the present invention is to provide a method for producing a carbon fiber sliver capable of easily forming a sliver.

In order to solve the above problems, the method for producing a carbon fiber sliver according to the present invention has the following configuration.
(1) Carbon fibers formed in a linear shape are aligned in parallel via a card machine and assembled in a string shape, and then twisted by a twisting machine to form a sliver consisting of only carbon fibers. It ’s a method of manufacturing sliver.
The carbon fiber bundle is cut to a predetermined length that can be drafted at the time of spinning and twisted to be entangled with each other.
The card machine has a take-in that pushes down the carbon fiber bundle sent from the feed roller with a pin needle planted on the surface, and a rotation speed that is faster than the rotation speed of the take-in in a direction opposite to the rotation direction of the take-in. A cylinder that pushes up the carbon fiber bundles that are rotated by the above and pushed down by the takein with a pin needle planted on the surface while aligning them in parallel, and a guide that is arranged at the upper boundary between the takein and the cylinder. A block body whose surface is formed in a V shape to regulate the path of the carbon fiber bundle, and a slide that receives the carbon fiber bundles aligned in parallel by the cylinder on the downstream side and collects them in one place. It is a pin card machine provided with a calendar roller for compacting the carbon fiber bundle.

In the present invention, the carbon fiber bundle is cut to a predetermined length that can be drafted at the time of spinning and twisted to be entangled with each other. Therefore, the synthesis described in Patent Document 1 Without using raw cotton containing fibers and / or natural fibers, slivers consisting only of carbon fibers can be formed in a state of being entangled with each other. In addition, since the carbon fiber bundle is cut to a length that allows drafting during spinning, the carbon fibers do not fall apart when the sliver is drafted and stretched during spinning, and the required size. Spun yarn can be obtained.

In addition, the card machine uses a tecine that pushes down the carbon fiber bundle sent from the feed roller with a pin needle planted on the surface, and a rotation speed that is faster than the rotation speed of the tecine in a direction opposite to the rotation direction of the tecine. A cylinder that pushes up the carbon fiber bundles that are rotated and pushed down by the takein with a pin needle planted on the surface while aligning them in parallel, and a V-shaped guide surface that is arranged at the upper boundary between the takein and the cylinder. A block body formed in the above to regulate the path of the carbon fiber bundle, a slide that receives the carbon fiber bundles aligned in parallel by the cylinder on the downstream side and collects them in one place, and compacts the collected carbon fiber bundles. Since it is a pin card machine equipped with a calendar roller, the carbon fiber focusing body is a pin needle planted on the surface of the take-in after being placed on the take-in by the feed roller to guide the upstream side of the block body. It is pushed down along the surface.

Further, the carbon fiber bundle pushed downward by the takein is pushed up by the pin needle planted on the surface of the cylinder along the guide surface on the downstream side of the block body in the direction opposite to the rotation direction of the takein. Therefore, the carbon fiber bundles are combed along the rotation direction of the cylinder and aligned in parallel with each other. Here, since the cylinder rotates at a higher speed than the take-in, the carbon fiber bundle is less likely to remain on the take-in side and moves to the cylinder side, so that the fibers can be avoided from falling off. Further, the pin needles of the takein and the cylinder are arranged at a relatively coarse distance as compared with the wire needle of the metallic card machine which is densely formed like a saw blade, and the tip is formed in a conical shape. , The carbon fiber bundle is less likely to break.

Further, the carbon fiber bundles aligned in parallel with each other on the cylinder are blown off by centrifugal force from the cylinder rotating at high speed and move to the slide on the downstream side. The carbon fiber bundles that have moved to the slide are collected in one place in a parallel aligned state and supplied to the calendar roller. The carbon fiber bundle supplied to the calendar roller becomes a string-shaped carbon fiber bundle compacted to a predetermined thickness. Since the string-shaped carbon fiber bundles are twisted in one direction by a twisting machine, frictional forces act on each other to entangle them. As a result, it is formed into a sliver consisting only of carbon fibers capable of obtaining a spun yarn of a required size at the time of spinning.

Therefore, according to the present invention, there is provided a method for producing a carbon fiber sliver, which is less likely to cause fibers to fall off or break, and can easily form a sliver made of only carbon fibers capable of obtaining a spun yarn of a required size at the time of spinning. can do.

(2) In the method for producing a carbon fiber sliver described in (1),
The twisting machine includes an L-shaped insertion tube that inserts the string-shaped carbon fiber bundle fed downward from the lower end of the calendar roller in the vertical direction and then bends and discharges the carbon fiber bundle in the horizontal direction.
The sliver is formed by turning the L-shaped insertion tube around a central axis in the vertical direction at an arbitrary speed and twisting the string-shaped carbon fiber bundle.

In the present invention, the twisting machine includes an L-shaped insertion tube that inserts a string-shaped carbon fiber bundle fed downward from the lower end of the calendar roller in the vertical direction and then bends it in the horizontal direction to discharge the carbon fiber bundle. , The L-shaped insertion tube is swirled around the central axis in the vertical direction at an arbitrary speed, and the string-shaped carbon fiber bundle is twisted to form a sliver, so that it is fed from the calendar roller. By adjusting the turning speed of the L-shaped insertion tube according to the feeding speed of the string-shaped carbon fiber bundle, it is possible to form a sliver in which the string-shaped carbon fiber bundle is entwined to a desired degree. can. Therefore, it is possible to obtain a spun yarn of a desired size by applying the necessary twist while applying the necessary draft at the time of spinning, while avoiding the sliver from being easily unraveled and falling apart at the time of spinning.

(3) In the method for producing a carbon fiber sliver described in (2),
Below the L-shaped insertion tube, a saucer that receives the sliver discharged from the L-shaped insertion tube and guides it to Kens is provided, and the saucer is directed in the direction opposite to the turning direction of the L-shaped insertion tube. It is characterized in that the sliver is spirally wound and stored in a kens by being swiveled.

In the present invention, below the L-shaped insertion tube, a saucer that receives the sliver discharged from the L-shaped insertion tube and guides it to the spiral is provided, and the saucer is directed in the direction opposite to the turning direction of the L-shaped insertion tube. Since the sliver is spirally wound and stored in the Kens, the sliver twisted by the swirling of the L-shaped insertion tube is spirally wound while maintaining the twisted state. Can be stored in a kens.

According to the present invention, there is provided a method for producing a carbon fiber sliver, which is less likely to cause fibers to fall off or break, and can easily form a sliver made of only carbon fibers capable of obtaining a spun yarn of a required size at the time of spinning. Can be done.

It is a schematic cross-sectional view of the manufacturing apparatus used in the manufacturing method of the carbon fiber sliver which concerns on this embodiment. It is a detailed step view of part A in the manufacturing apparatus shown in FIG. It is a detailed cross-sectional view of part B in the manufacturing apparatus shown in FIG. It is a schematic cross-sectional view of the manufacturing apparatus used in the manufacturing method of the carbon fiber sliver disclosed in Patent Document 1.

Next, the method for producing the carbon fiber sliver according to the embodiment of the present invention will be described in detail with reference to the drawings. Here, the manufacturing method of the carbon fiber sliver and the manufacturing apparatus thereof will be described in detail with reference to FIGS. 1 to 3. FIG. 1 shows a schematic cross-sectional view of a manufacturing apparatus used in the method for manufacturing a carbon fiber sliver according to the present embodiment. FIG. 2 shows a detailed step view of part A in the manufacturing apparatus shown in FIG. FIG. 3 shows a detailed cross-sectional view of part B in the manufacturing apparatus shown in FIG.

As shown in FIGS. 1 to 3, in the method for producing the carbon fiber sliver, the linearly formed carbon fiber bundles 1 are aligned in parallel via the card machine 3 and then assembled in a string shape. This is a method for producing a carbon fiber sliver, which is twisted by a twisting machine 5 to form a sliver 2 composed of only carbon fibers 1a. The manufacturing apparatus 10 used in the method for manufacturing the carbon fiber sliver includes at least a card machine 3 (3P) and a twisting machine 5 described below. The carbon fiber focusing body 1 is formed by linearly focusing a plurality of carbon fibers 1a, and the thickness thereof is preferably about 0.5 to 2 mm.

Here, the carbon fiber bundle 1 needs to be cut to a predetermined length that can be drafted at the time of spinning and can be twisted and entangled with each other. The predetermined length of the carbon fiber bundle 1 is preferably, for example, about 30 to 100 cm. This is because if the carbon fiber bundle 1 is shorter than a predetermined length, the sliver 2 made of only the carbon fibers 1a is not entangled with each other even if the sliver 2 is twisted, and it becomes difficult to obtain a spun yarn of a size required at the time of spinning. Further, if the carbon fiber bundle 1 is longer than a predetermined length, the distance between the front roller and the back roller becomes too large when drafting the sliver 2 during spinning, which makes it difficult for a general spinning machine to handle the draft. Because it becomes.

The carbon fiber bundle 1 is preferably a bundle of new carbon fibers 1a formed linearly with a predetermined thickness and cut to a predetermined length, but a bundle of recycled carbon fibers 1a is predetermined. It may be cut to the length of. For example, the carbon fiber aggregate used in the carbon fiber reinforced plastic (CFRP) may be heat-treated and reused. In the case of heat treatment and reuse, the carbon fiber agglomerates cut to a predetermined length are divided by, for example, a roller pressurizing device (not shown) described below and cut to the above-mentioned predetermined length. The carbon fiber bundle 1 may be formed.

Specifically, the roller pressurizing device includes at least a pair of roller bodies. Further, the outer peripheral surface of the roller body has peaks and valleys formed spirally with respect to each rotation axis, and the peaks and valleys are arranged so as to face each other. Then, the mountain portion of one roller body and the mountain portion of the other roller body rotate and divide the carbon fiber aggregate along the carbon fiber while narrowing the pressure. In this way, the carbon fiber aggregates cut to a predetermined length by the roller pressurizing device may be divided to form the carbon fiber bundle 1 linearly formed with the predetermined length.

Further, the card machine 3 includes a feed roller 31 that feeds the carbon fiber bundle 1 and a take-in 32 that pushes the carbon fiber bundle 1 sent from the feed roller 31 downward with a pin needle 321 planted on the surface. The takein 32 rotates in the direction opposite to the rotation direction (direction of arrow F1) (direction of arrow F2) at a rotation speed v2 faster than the rotation speed v1 of the takein 32, and is pushed down by the takein 32 with a pin needle 331 planted on the surface. The carbon fiber focusing bodies 1 are arranged in parallel and pushed upward while being aligned in parallel, and the guide surfaces 341 and 342 are arranged in the upper boundary between the takein 32 and the cylinder 33 to form a V-shape for carbon fiber focusing. A block body 34 that regulates the path of the body 1, a slide 35 that receives and collects the carbon fiber focusing bodies 1 aligned in parallel by the cylinder 33 on the downstream side, and a calendar roller 36 that compacts the collected carbon fiber focusing bodies 1. It is a pin card machine 3P equipped with.

A conveyor 7 for supplying the carbon fiber focusing body 1 is provided on the upstream side of the pin card machine 3P. The carbon fiber bundles 1 cut to a predetermined length are placed on the conveyor 7 so as to be aligned in the transport direction. Further, the feed roller 31 is composed of a pair of cylindrical rollers 31a and 31b, and supplies the carbon fiber focusing body 1 conveyed by the transfer conveyor 7 to the upper portion of the takein 32 while rotating at a predetermined speed. The takein 32 is a cylindrical roller body in which pin needles 321 are planted on the surface at predetermined intervals. The tip of the pin needle 321 is formed in a conical shape, and the tip of the pin needle 321 stands up with its tip inclined in the rotational direction with respect to the surface.

Further, the cylinder 33 is a cylindrical roller body in which pin needles 331 are planted at predetermined intervals on the surface thereof, similarly to the take-in 32. The tip of the pin needle 331 is formed in a conical shape, and the tip of the pin needle 331 is inclined in the rotational direction with respect to the surface and stands upright. Further, the pin needles 331 of the cylinder 33 are arranged in columns along the circumferential direction of the cylinder 33 at positions where the pin needles 321 of the takein 32 and the tip side wrap and do not interfere with each other. Further, a walker roller 332 is arranged on the upper outer peripheral side of the cylinder 33.

Therefore, the carbon fiber focusing body 1 supplied to the pin card machine 3P by the conveyor 7 is placed on the takein 32 by the feed roller 31 and then blocked by the pin needle 321 planted on the surface of the takein 32. It is pushed downward along the guide surface 341 on the upstream side of the body 34.

Further, the carbon fiber focusing body 1 pushed downward by the take-in 32 is rotated in the direction of rotation of the take-in 32 along the guide surface 342 on the downstream side of the block body 34 by the pin needle 331 planted on the surface of the cylinder 33. It is pushed up in the direction opposite to (direction of arrow F1) (direction of arrow F2). Then, the carbon fiber focusing body 1 is combed along the rotation direction of the cylinder 33 (direction of arrow F2) and aligned in parallel with each other. The rotation speed v1 of the take-in 32 is preferably 80 to 100 rpm, and the rotation speed v2 of the cylinder 33 is preferably about 400 to 500 rpm.

Here, since the cylinder 33 rotates at a higher speed than the take-in 32, the carbon fiber focusing body 1 is unlikely to remain on the take-in 32 side and shifts to the cylinder 33 side, so that the fibers can be avoided from falling off. Further, the pin needles 321 and 331 of the take-in 32 and the cylinder 33 are arranged at a relatively coarse distance as compared with the wire needles of the metallic card machine which are densely formed like a saw blade, and the tips are conical. Since it is formed, the carbon fiber bundle 1 is unlikely to be broken.

Next, the carbon fiber focusing bodies 1 aligned in parallel with each other on the cylinder 33 are blown off by centrifugal force from the cylinder 33 rotating at high speed and moved to the slide 35 on the downstream side. The carbon fiber focusing bodies 1 that have moved to the slide 35 are gathered at one place in a state of being aligned in parallel and supplied to the calendar roller 36. The calendar roller 36 is composed of a pair of cylindrical rollers 36a and 36b having concave grooves, and the carbon fiber focusing body 1 supplied to the calendar roller 36 is a string-shaped carbon fiber compacted to a predetermined thickness. It becomes the focusing body 11. The string-shaped carbon fiber bundle 11 has a thickness of about 10 to 20 mm and is twisted in one direction by the twisting machine 5 described below, so that frictional forces act on each other to entangle the carbon fiber bundles 11. As a result, the sliver 2 is formed of only carbon fibers 1a capable of obtaining a spun yarn of a required size at the time of spinning.

Here, the twisting machine 5 inserts the string-shaped carbon fiber focusing body 11 fed downward from the lower end of the calendar roller 36 in the vertical direction, and then bends the string-shaped carbon fiber bundle 11 in the horizontal direction to discharge the vertical pipe 511 and the horizontal pipe. The L-shaped insertion pipe 51 composed of 512, the rotating plate 52 orthogonal to the vertical pipe 511 of the L-shaped insertion pipe 51 and connected by the central axis JP in the vertical direction, and the outer peripheral surface of the rotating plate 52 are in contact with each other. It is preferable to include a drive motor 53 that rotates the L-shaped insertion tube 51 around the central axis JP.

Then, the drive motor 53 is rotated in the direction of the arrow F3, the L-shaped insertion pipe 51 is swiveled around the central axis JP in the direction of the arrow F4 at an arbitrary speed, and the string-shaped pipe is discharged from the horizontal pipe 512. The sliver 2 is formed by twisting the carbon fiber bundle 11 in the direction of the arrow F4.

Therefore, by adjusting the turning speed of the L-shaped insertion pipe 51 according to the feeding speed of the string-shaped carbon fiber focusing body 11 fed from the calendar roller 36, the string-shaped carbon fiber focusing body 11 can be formed. The sliver 2 can be formed so as to be entangled to a desired degree. For example, when the carbon fiber bundle 1 is cut to a length of 50 to 60 cm, the twist applied to the sliver 2 is preferably about 3 to 5 times / m.

As a result, while avoiding that the sliver 2 is easily unraveled and separated at the time of spinning, the sliver 2 is stretched by applying the necessary twist while applying the necessary draft at the time of spinning to obtain a spun yarn of a desired size. Obtainable.

Below the L-shaped insertion pipe 51, a storage device 6 provided with a saucer 61 that receives the sliver 2 discharged from the horizontal pipe 512 of the L-shaped insertion pipe 51 and guides it to the Kens 62 is installed. Is preferable. Here, the saucer 61 has a guide cylinder 611 extending from the lower end of the conical receiving portion toward the peripheral wall side of the Kens 62, and the lower end portion of the guide cylinder 611 is formed on the outer peripheral side of the upper lid 63 of the Kens 62. It is connected to the through hole 631. The sliver 2 is housed in the Kens 62 via the through hole 631.

Further, the upper lid 63 is connected to a rotation mechanism (not shown). Then, by operating the rotation mechanism, the saucer 61 is swiveled in the direction opposite to the swivel direction (direction of arrow F4) of the L-shaped insertion pipe 51 (direction of arrow F5), and the sliver 2 is spirally wound. It is preferable to store it in the Kens 62. As a result, the sliver 2 twisted by turning the L-shaped insertion tube 51 can be spirally wound and stored in the Kens 62 while maintaining the twisted state.

<Effect>
As described in detail above, according to the method for producing a carbon fiber sliver according to the present embodiment, the carbon fiber bundle 1 can be drafted at the time of spinning, and can be twisted and entangled with each other. Since it is cut to a predetermined length, the sliver 2 made of only carbon fiber 1a is entwined with each other without using the raw cotton containing synthetic fiber and / or natural fiber described in Patent Document 1. Can be formed. Further, since the carbon fiber bundle 1 is cut to a length that can be drafted at the time of spinning, the carbon fibers 1a do not fall apart when the sliver 2 is drafted and stretched at the time of spinning. It is possible to obtain spun yarn of the required size.

Further, the card machine 3 has a take-in 32 that pushes down the carbon fiber bundle 1 sent from the feed roller 31 with a pin needle 321 planted on the surface, and a rotation direction of the take-in 32 (direction of arrow F1). While rotating in the opposite direction (direction of arrow F2) at a rotation speed v2 faster than the rotation speed v1 of the takein 32 and aligning the carbon fiber bundles 1 pushed down by the takein 32 with the pin needle 331 planted on the surface in parallel. A cylinder 33 that pushes upward, a block body 34 that is arranged at the upper boundary between the takein 32 and the cylinder 33, and guide surfaces 341 and 342 are formed in a V shape to regulate the path of the carbon fiber focusing body 1, and the cylinder. Since it is a pin card machine 3P equipped with a slide 35 for receiving the carbon fiber focusing bodies 1 arranged in parallel at 33 on the downstream side and collecting them at one place, and a calendar roller 36 for compacting the collected carbon fiber focusing bodies 1. The carbon fiber focusing body 1 is a pin needle 321 planted on the surface of the take-in 32 after being placed on the take-in 32 by the feed roller 31, along the guide surface 341 on the upstream side of the block body 34. Pushed down.

Further, the carbon fiber focusing body 1 pushed downward by the take-in 32 is rotated in the direction of rotation of the take-in 32 along the guide surface 342 on the downstream side of the block body 34 by the pin needle 331 planted on the surface of the cylinder 33. It is pushed up in the direction opposite to (direction of arrow F1) (direction of arrow F2). Therefore, the carbon fiber focusing bodies 1 are combed along the rotation direction of the cylinder 33 (direction of arrow F2) and aligned in parallel with each other. Here, since the cylinder 33 rotates at a higher speed than the take-in 32, the carbon fiber focusing body 1 is unlikely to remain on the take-in 32 side and shifts to the cylinder 33 side, so that the fibers can be avoided from falling off. Further, the pin needles 321 and 331 of the take-in 32 and the cylinder 33 are arranged at a relatively coarse distance as compared with the wire needles of the metallic card machine which are densely formed like a saw blade, and the tips are conical. Since it is formed, the carbon fiber bundle 1 is unlikely to be broken.

Further, the carbon fiber focusing bodies 1 aligned in parallel with each other on the cylinder 33 are blown off by centrifugal force from the cylinder 33 rotating at high speed and move to the slide 35 on the downstream side. The carbon fiber focusing bodies 1 that have moved to the slide 35 are gathered at one place in a state of being aligned in parallel and supplied to the calendar roller 36. The carbon fiber bundle 1 supplied to the calendar roller 36 becomes a string-shaped carbon fiber bundle 11 compacted to a predetermined thickness. Since the string-shaped carbon fiber bundle 11 is twisted in one direction by the twisting machine 5, frictional forces act on each other to entangle the carbon fiber bundles 11. As a result, the sliver 2 is formed of only carbon fibers 1a capable of obtaining a spun yarn of a required size at the time of spinning.

Therefore, according to the present embodiment, the production of a carbon fiber sliver capable of easily forming a sliver 2 made of only carbon fibers 1a, which is less likely to cause fibers to fall off or break, and can obtain a spun yarn of a required size at the time of spinning. A method can be provided.

Further, according to the present embodiment, the twisting machine 5 inserts the string-shaped carbon fiber focusing body 11 fed downward from the lower end of the calendar roller 36 in the vertical direction, and then bends and discharges the carbon fiber in the horizontal direction. The sliver 2 is provided with an L-shaped insertion tube 51, and the L-shaped insertion tube 51 is swiveled around the central axis JP in the vertical direction at an arbitrary speed to twist the string-shaped carbon fiber focusing body 11. By adjusting the turning speed of the L-shaped insertion tube 51 according to the feeding speed of the string-shaped carbon fiber focusing body 11 fed from the calendar roller 36, the string-shaped carbon fiber focusing is performed. The sliver 2 can be formed by entwining the body 11 to a desired degree. Therefore, it is possible to obtain a spun yarn of a desired size by applying a necessary twist while applying a draft necessary for spinning while avoiding that the sliver 2 is easily unraveled and separated at the time of spinning.

Further, according to the present embodiment, below the L-shaped insertion pipe 51, a saucer 61 that receives the sliver 2 discharged from the L-shaped insertion pipe 51 and guides it to the helix 62 is provided, and the saucer 61 is L. Since the sliver 2 is spirally wound and stored in the Kens 62 by turning the sliver 2 in the direction opposite to the turning direction (direction of arrow F4) of the character-shaped insertion pipe 51 (direction of arrow F5), the L-shaped insertion pipe 51 The sliver 2 twisted by the swirling of the sliver 2 can be spirally wound and stored in the Kens 62 while maintaining the twisted state.

INDUSTRIAL APPLICABILITY The present invention can be used as a method for producing a carbon fiber sliver in which linear carbon fiber bundles cut to a predetermined length are arranged in parallel and twisted to form a sliver composed of only carbon fibers.

1 Carbon fiber focusing body 1a Carbon fiber 2 Sliver 3 Card machine 3P Pin card machine 5 Twisting machine 10 Manufacturing equipment 11 String-shaped carbon fiber focusing body 31 Feed roller 32 Takein 33 Cylinder 34 Block body 35 Slider 36 Calendar roller 51 L-shaped Insertion tube 61 Receiving tray 62 Kens 321 Pin needle 331 Pin needle 341, 342 Guide surface JP center axis

Claims (3)

Manufacture of a carbon fiber sliver that forms a sliver consisting of only carbon fibers by arranging linearly formed carbon fiber bundles in parallel via a card machine and assembling them in a string shape, and then twisting them with a twisting machine. It ’s a method,
The carbon fiber bundle is cut to a predetermined length that can be drafted at the time of spinning and twisted to be entangled with each other.
The card machine has a take-in that pushes down the carbon fiber bundle sent from the feed roller with a pin needle planted on the surface, and a rotation speed that is faster than the rotation speed of the take-in in a direction opposite to the rotation direction of the take-in. A cylinder that pushes up the carbon fiber bundles that are rotated by the above and pushed down by the takein with a pin needle planted on the surface while aligning them in parallel, and a guide that is arranged at the upper boundary between the takein and the cylinder. A block body whose surface is formed in a V shape to regulate the path of the carbon fiber bundle, a slide for receiving and collecting the carbon fiber bundles aligned in parallel by the cylinder on the downstream side, and the collected carbon. A method for manufacturing a carbon fiber sliver, which is a pin card machine equipped with a calendar roller that compacts a fiber bundle. In the method for producing a carbon fiber sliver according to claim 1,
The twisting machine includes an L-shaped insertion tube that inserts the string-shaped carbon fiber bundle fed downward from the lower end of the calendar roller in the vertical direction and then bends and discharges the carbon fiber bundle in the horizontal direction.
The carbon fiber is characterized in that the sliver is formed by turning the L-shaped insertion tube around a central axis in the vertical direction at an arbitrary speed and twisting the string-shaped carbon fiber bundle. How to make sliver. In the method for producing a carbon fiber sliver according to claim 2,
Below the L-shaped insertion tube, a saucer for receiving the sliver discharged from the L-shaped insertion tube and guiding the sliver to Kens is provided, and the saucer is directed in the direction opposite to the turning direction of the L-shaped insertion tube. A method for producing a carbon fiber sliver, which comprises turning and spirally winding the sliver and storing it in a kens.

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