JPH03284582A - Method and device for winding carbon fiber - Google Patents

Abstract

PURPOSE:To prevent generation of fluff and pill and a thread break or the like in a carbon fiber, even when disentangling is performed at a high speed, by starting rewinding through a touch roller with its contact pressure smaller than the specified thereafter gradually increasing the contact pressure to the specified value and next performing rewinding at the specified contact pressure. CONSTITUTION:A touch roller 4, brought into contact with a paper pipe 2, is made movable relating thereto, and the roller 4 is moved in such a manner that a compression load, applied to a single strand of winding start, is ten times or less the compression load of winding end. Concretely, force F1 of a tensile spring means 12 is set to about 800gr, in a condition that the roller 4 is brought into contact with the paper pipe 2 in the beginning of rewinding, and increased together with starting rewinding. On the other hand, a return spring means 14 is placed in a condition that tension is received to a left side by about 5mm in a condition that the roller 4 is brought into contact with the paper pipe in the beginning of rewinding, and force F2 at this time is set to about 600gr and to zero in the point of time the roller 4 is moved to a right side to return the spring means 14 by about 5mm by decreasing the force F2 while starting rewinding of a carbon fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for winding carbon fiber strands having as many as 1,000 to 12,000 filaments onto a bobbin, and an apparatus therefor.

In general, carbonized or graphitized carbon fibers are wound around a bobbin with a square end, for example, while adjusting the shape using a touch roller. The carbon fibers wound around the bobbin are then unwound as necessary and used for desired purposes.

However, in this touch roller touch up winder, especially when the number of filaments is i ooo~
When a carbon fiber strand with as many as 12,000 filaments is wound onto a bobbin and then unwound, the last 100 to 2
At the 00m portion, problems such as fluffing and yarn breakage occurred.

This is particularly noticeable when the unwinding speed is increased.

The inventor of the present invention discovered a method as a result of conducting research experiments to find out why such a problem occurs.

In other words, according to the conventional take-up winder with a touch roller, the touch roller is in contact with the bobbin with a constant pressure (contact pressure), and therefore, the number of filaments is particularly large, 1000 to 12000, i.e. It has been found that in thick carbon fiber strands, the compressive load applied to a single strand differs between the beginning and the end of winding, and is about 15 to 20 times greater at the beginning of winding.

To explain further, 1. For example, the paper tube diameter is 87 mm and the number of winds is 4.
, traverse 250mm, touch roller contact pressure 800g
r, and when a carbon fiber strand consisting of 3000 filaments (strand width approximately 3 mm) is wound with a take-up winder, the winding length is 150 to 200 m.
When the strand is wound to a thickness of 5 to 6 mm, approximately 90% of the strand comes into contact with the touch roller, and as shown in FIGS. 6 and 7, the strand 1 reaches a normal value for the first time. The contact pressure was about 11gr per strand, but it was found that at the beginning of winding it was around 200gr per strand.

In this way, the contact pressure per strand becomes large at the beginning of winding, causing each filament within the strand to slide sideways, inducing yarn breakage, and when unraveling, these parts It has been found that this causes fuzzing, pilling, and even yarn breakage, making it unusable. This tendency became particularly noticeable when the unwinding speed was increased.

This problem may be solved by twisting the carbon fiber strands, but twisting is practically impossible due to the strength and shape of the strands, and such a solution cannot be adopted.

When winding carbon fiber strands, the present inventor has determined that the compression load applied to each strand at the beginning of winding is 10 times or less, preferably 5 times or less, than the compression load at the end of winding, thereby achieving a more specific number. In other words, in the above example, the contact pressure of the touch roller against the bobbin is weak until the bobbin is wound to a thickness of about 5 mm, and then it is gradually increased to about 800 gr to prevent the filament from sliding inside the strand. As a result, even when unwinding at high speed,
It has been found that high-quality carbon fibers can be provided without fuzz or pilling, and also without yarn breakage.

The present invention has been made based on this new knowledge.

Therefore, the object of the present invention is that the number of filaments is 1,000 to 1,000.
1 in a strand with 12,000 filaments, 1
This reduces side-slipping of the book filament and eliminates yarn breakage, resulting in no fuzz or pilling on the carbon fibers even when unwinding at high speeds, and even yarn breakage. An object of the present invention is to provide a method and apparatus for winding carbon fiber, which can provide high-quality carbon fiber without any problems.

The above object is achieved by the carbon fiber winding method and apparatus according to the present invention. In summary, the present invention brings the touch roller into contact with the bobbin with a specified contact pressure.
In a method for winding a carbon fiber strand with a filament count of 1,000 to 12,000, winding is started with the contact pressure of the touch roller being lower than the specified contact pressure, and then the contact pressure of the touch roller is increased to the specified contact pressure. This carbon fiber winding method is characterized in that the carbon fiber is gradually increased to a contact pressure, and then winding is performed at a specified contact pressure. At this time, the contact pressure of the touch roller is such that the compression load applied to one strand at the start of winding is 10 times or less than the compression load applied to one strand at the end of winding.

Moreover, such a winding method includes a bobbin for winding the carbon fiber strand, a touch roller that comes into contact with the bobbin,
a swinging arm that rotatably holds the touch roller at one end and is pivotally connected to a support shaft at the other end and can move the touch roller toward and away from the bobbin; a tension spring means connected to the swinging arm so as to abut against the bobbin at a predetermined pressure; and a tension spring means arranged symmetrically with the swinging arm, the tension spring means A carbon fiber winding device characterized by having a return spring means for applying a force in a direction opposite to the biasing force and for setting an initial contact pressure of the touch roller against the bobbin, or a carbon fiber winding device. A bobbin for winding a strand, a touch roller that contacts the bobbin, one end of which rotatably holds the bobbin, the other end of which is pivotally connected to a support shaft, and the bobbin is brought into contact with the touch roller. a swinging arm capable of moving away from the swinging arm; a tension spring means connected to the swinging arm for bringing the bobbin into contact with the touch roller at a predetermined pressure; and a tension spring means symmetrical to the tension spring means. a return spring means arranged to apply a force to the swing arm in a direction opposite to the biasing force of the tension spring means to set an initial contact pressure of the bobbin against the touch roller; This method is suitably implemented in a carbon fiber winding device characterized by having the following features.

Trap Soil 1 Next, the carbon fiber winding method and device according to the present invention will be explained in more detail with reference to the drawings.

According to one embodiment of the present invention, as shown in FIG. The compression load applied to a single strand at the beginning is moved to less than 10 times, preferably less than 5 times, the compression load at the end of winding.

To explain further, as mentioned above, for example, the paper tube diameter is 87 m.
m, the number of winds is 4, the traverse is 250 mm, the contact pressure of the touch roller is 800 gr, and when a carbon fiber strand (strand width of about 3 mm) consisting of 3000 filaments is wound around the paper tube 2, as shown in Fig. 2. The contact pressure of the touch roller 4 gradually increases from around 200 gr at the start of winding, and reaches 8 when the winding thickness reaches 5 mm, when about 90% of the strand is in contact with the touch roller.
00gr.

In other words, the touch roller moves 2 times from the first position (position ■ in Figure 1) to the second position (position ■ in Figure 1).
The touch roller is moved so that the contact pressure increases from 00gr to 800gr, and from the second position onwards, the contact pressure of the touch roller is 800gr.
It is moved so that r is maintained at a substantially constant specified value.

As a result, the compressive load applied to each strand is 50 gr or less at the beginning of winding, actually about 25 gr, and about 11 gr at the end of winding.

By the method of this example, the carbon fibers were wound up to a winding thickness of 20 mm at a winding speed of t7 mm/sec, and were unwound at an unwinding speed of 10 m/min, which is twice the conventional unwinding speed. but,
The occurrence of fluff and pilling was extremely low. In addition, it was possible to completely release the thread until the end, and there was no thread left behind, which was the case in the past.

FIG. 3 shows an embodiment of an apparatus for carrying out the method of this embodiment.

According to this embodiment, the touch roller 4 has a rotating shaft l at the tip of a swinging arm 8 that is swingably provided with a shaft 6 as a fulcrum.
It is rotatably attached via O, and is able to come into contact with the outer circumferential surface of the paper tube 2.

Further, the swinging arm 8 is attached to the left side in FIG. 3 with a force F by a tension spring means 12 such as a coil spring in order to bring the touch roller 4 into contact with the outer peripheral surface of the paper tube 2 with a predetermined pressure. Forced. Further, a return spring means 14, such as a coil spring, arranged symmetrically with the tension spring means 12 is used to apply force F2 to the right in FIG. Forced. Therefore, the forces F and -F are applied to the touch roller 4.

More specifically, according to this embodiment, the force F1 of the tension spring means 12 is 800 mm when the touch roller 4 is in contact with the paper tube 2 at the beginning of winding (the state indicated by the dotted line in FIG. 3).
gr, and is configured to increase with the start of winding. On the other hand, the return spring means 14 moves by 5 mm when the touch roller 4 is in contact with the paper tube at the beginning of winding.
In Figure 3, it is in a state where it is pulled to the left, and the force F2 at that time is 600 gr. As winding of the carbon fiber starts, the force F2 decreases, and the touch roller moves to the right in Figure 3. When the return spring means is returned by 5 mm (3rd
The force F2 is set to be zero in the state shown by the solid line in the figure.

With this configuration, the method of the present invention was suitably implemented, and the above-mentioned effects were achieved.

Of course, although the tension spring means 12 and the return spring means 14 have been described as being coil springs, they may also be hydraulic or pneumatic cylinders, and in some cases, a combination of these may be used. Further, the arm length of the swinging arm 8, the position of the swinging fulcrum 6, the attachment position of the tension spring means 12 and the return spring means 14 to the swinging arm 8, and the spring force F, F, etc. It is appropriately designed depending on the desired magnitude of the contact pressure of the touch roller 4 and the like.

FIG. 4 shows another embodiment of the method according to the invention. According to this embodiment, unlike the previous embodiment, the touch roller 4 in contact with the paper tube 2 is fixed, the paper tube 2 is movable with respect to the touch roller 4, and the strand 1 at the beginning of winding is
The compression load applied to the book is 10% of the compression load at the end of the book.
It is moved by a factor of less than 5 times, preferably by a factor of 5 or less.

In other words, according to the second embodiment, one paper tube 2 is
As the winding thickness increases, it changes from the first position (the winding start position, the position marked ■ in Figure 4) to the second position (the position where approximately 90% of the strand contacts the touch roller, in Figure 4). As shown in FIG. 2, the contact pressure of the touch roller is increased from 200 gr to 800 gr until the position is moved so that it is maintained at a roughly constant specified value.

As a result, the compressive load applied to each strand is 50 gr or less at the beginning of winding, actually about 25 gr, and about 11 gr at the end of winding.

By the method of this example, carbon fibers were wound up to a thickness of 20 mm at a winding speed of 17 mm/sec, and then unwound at an unwinding speed of 10 m/min, which is twice the conventional unwinding speed. but,
The occurrence of fluff and pilling was extremely low. In addition, it was possible to completely release the thread until the end, and there was no thread left behind, which was the case in the past.

FIG. 5 shows an embodiment of an apparatus for carrying out the method of the second embodiment.

According to this embodiment, the paper tube 2 is rotatably attached via a rotary shaft 10 to the tip of a swinging arm 8 that is swingably provided around a shaft 6 as a fulcrum. It is said that it is possible to come into contact with. Further, the swing arm 8 is configured to bring the paper tube 2 into contact with the outer peripheral surface of the touch roller 4 with a predetermined pressure (a force F is applied by a tension spring means 12 such as a coil spring).
1, it is biased to the right in FIG. Further, a return spring means 14 such as a coil spring arranged symmetrically with the tension spring means 12 biases the tension spring means 12 to the left side in FIG. be done. Therefore, forces F and -Fz are applied to the paper tube 2.

More specifically, according to this embodiment, the force F1 of the tension spring means I2 is 800 mm when the paper tube 2 is in contact with the touch roller 4 at the beginning of winding (the state indicated by the dotted line in FIG. 5).
gr, and is configured to increase with the start of winding. On the other hand, the return spring means 14 is applied to the fifth
In the figure, the right side is under tension, and the force F2 at that time is
was set at 600 gr, and as winding of the carbon fibers started, the force F2 decreased, and while winding the carbon fibers, the paper tube 2 moved to the left in Fig. 5, and the return spring means 14 was returned by 5 mm. The force F2 is set to be zero at this point in time (the state indicated by the solid line in FIG. 5).

With this configuration, the method of the present invention was suitably implemented, and the above-mentioned effects were achieved.

Of course, although the tension spring means 12 and the return spring means 14 have been described as being coil springs, they may also be hydraulic or pneumatic cylinders, or a combination of these may be used depending on the case. In addition, the arm length of the swing arm 8, the position of the swing fulcrum 6, and the tension spring means 12
The attachment position of the return spring means 14 to the swing arm 8 and the spring force F, , F, etc. are determined depending on the weight of the paper tube 2 itself, which increases as the winding operation progresses, and the desired contact with the touch roller 4. It is designed as appropriate, taking into consideration the magnitude of pressure, etc.

The carbon fiber winding method and device according to the present invention configured as described above weakens the contact pressure of the touch roller against the bobbin at the start of winding, and gradually increases it to a specified contact pressure. This structure reduces filament slippage within the strand, eliminates thread breakage, and, as a result,
Even when unraveling at high speeds, the carbon fibers do not develop fluff or pilling, and even breakage does not occur.
It has the advantage of being able to provide high-quality carbon fiber.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining one embodiment of the carbon fiber winding method according to the present invention. FIG. 2 is a graph explaining the effects of the present invention. FIG. 3 is a front view of a winding device for carrying out the method according to the invention described with reference to FIG. 1; FIG. 4 is an explanatory diagram for explaining another embodiment of the carbon fiber winding method according to the present invention. FIG. 5 is a front view of a winding device for carrying out the method according to the invention described with reference to FIG. FIGS. 6 and 7 are graphs for explaining the effects of the conventional carbon fiber winding method. 2: Bobbin (paper tube) 4: Touch roller 8: Swing arm 12: Tension spring means 14 Return spring means

Claims (1)

[Claims] 1) By bringing a touch roller into contact with the bobbin with a specified contact pressure, the number of filaments can be reduced to 1000 to 120.
In the method of winding a carbon fiber strand made of 00 filament, winding is started with a contact pressure of the touch roller that is lower than the specified contact pressure, and then the contact pressure of the touch roller is gradually reduced to the specified contact pressure. A method for winding carbon fiber, characterized by increasing the contact pressure to a certain level, and then winding it at a specified contact pressure. 2) The carbon fiber winding method according to claim 1, wherein the contact pressure of the touch roller is such that the compressive load applied to one strand at the start of winding is 10 times or less of the compressive load at the end of winding. 3) A bobbin for winding a carbon fiber strand having a filament count of 1000 to 12000, a touch roller that comes into contact with the bobbin, one end of which holds the touch roller rotatably, and the other end of which is a spindle. is pivoted to
a swinging arm capable of moving the touch roller toward and away from the bobbin; and a tensioning arm connected to the swinging arm to bring the touch roller into contact with the bobbin at a predetermined pressure. a spring means disposed symmetrically with the tension spring means to apply a force to the swing arm in a direction opposite to the biasing force of the tension spring means, the spring means being arranged symmetrically to the tension spring means to apply a force to the swing arm in a direction opposite to the biasing force of the tension spring means; and return spring means for setting the carbon fiber winding device. 4) A bobbin for winding a carbon fiber strand having a filament count of 1,000 to 12,000, a touch roller that comes into contact with the bobbin, one end of which holds the bobbin rotatably, and the other end of which is attached to a spindle. a swinging arm that is pivotally mounted and can move the bobbin toward and away from the touch roller; and a swinging arm that allows the bobbin to contact the touch roller with a predetermined pressure. a connected tension spring means arranged symmetrically with said tension spring means to apply a force to said rocking arm in a direction opposite to the biasing force by said tension spring means, and to apply a force to said swing arm in a direction opposite to the biasing force of said tension spring means; and return spring means for setting an initial contact pressure.