JP5049372B2 - Carbon fiber precursor tow and method for packing flame resistant fiber precursor tow - Google Patents

Description

  The present invention relates to a carbon fiber precursor tow having a total fineness of 48000 dtex to 720,000 dtex and a packaging method for a flame resistant fiber precursor tow.

  Since carbon fibers are excellent in specific strength, specific elastic modulus, fire resistance, heat resistance, durability and the like, their application fields are expanding. In order to secure the quality with the current manufacturing technology, the productivity of the fiber must be suppressed, and the price is inevitably high. In recent years, in order to increase the productivity of carbon fibers and reduce costs, thick carbon fiber precursor tows having a filament number of 50,000 or more have been adopted, and as a result, the tow packed with such a large fineness tow is used. Packages are also forced to grow in size. In order to increase the size of the package, it is considered that a packaging method by dropping the tow is advantageous. Conventionally, various packing methods have been proposed by towing off a tow. In addition, as the precursor tow for the flame resistant fiber, one having a fineness is similarly adopted from the viewpoint of productivity.

  For example, according to Patent Document 1, unstretched tows are sucked into a half of a can with a ejector and traversed so that 10 to 20 layers are stacked and stored in a zigzag shape continuously from one end to the other end of the can. After that, the storage of the tow is switched to the half of the non-storage side of the tow, and 10 to 20 layers are stacked and stored. During this switching, the half of the tow previously housed is pushed into the can while the air inside the tow is vented with a pushing plate having an air vent hole on the pushing surface. The tow package is manufactured by repeating this switching operation. By storing in this way, the tow can be stored at high density.

For example, according to Patent Document 2, a spun undrawn yarn tow is taken up by a nip roller and stored in a tow packing container below the spun undrawn yarn tow. At this time, a gas having an ejection pressure of 0.3 kg / cm ² or more and an ejection speed of 150 m / second or more is passed 30 times from a pair of gas injection nozzles arranged in the lateral direction across the tow under the nip roller. Inject alternately onto the tow in the middle of the fall with a cycle of at least / sec. By doing so, the unstretched tow can be continuously and stably stored in the tow packing container, and can be pulled out without any distortion or tangle of the unstretched tow during stretching. It is possible to improve.

  Further, for example, in Patent Document 3, the polyester fiber unstretched tow is dropped on a tow packing container that traverses in the X and Y directions below the gear wheel while blowing air from the left and right while dropping through the gear wheel.

  Also, for example, in Patent Document 4, after cooling a number of filaments of melt-spun polyester fiber and applying oiling or the like, a plurality of unstretched tows for many spindles are converged to obtain unstretched tows. Guide and drop while picking up through the ejector, alternately switch between the two splash plates, and drop and store alternately in half of the container in a tow packing container that traverses a predetermined amount of tow downward in the X and Y directions To do. Each time the storage is completed, the pair of press plates are alternately pressed against the tow that has been stored. The presser plate press compresses the bulky yarn bundle and allows it to be stored in a large amount in a tow packing container.

  For example, according to Patent Document 5, the cylindrical container is rotated, the filament is dropped to a position off the center, and the compression member is moved up and down to another position. Filaments are generally deposited in a container so as to draw a large circle while drawing a small circle, and are compressed without interruption by a compression member. It is said that high compression is achieved while the structure is simple.

For example, Patent Document 6 discloses a package in which a carbon fiber precursor is wrapped at a moisture content of 3 to 150 wt% with a film having an oxygen permeability of 200 ml / (m ² · 24 hr · atm) or less and a thickness of ²⁰ to 200 μm, and a method for producing the same. It is about. When packing by towing off the tow, the moisture content of the precursor is increased to provide convergence, and at the same time, even if a high moisture content carbon fiber precursor is stored for a long time, the growth of bacteria and mold is suppressed, and carbon The fiber strength can be prevented from lowering.

Japanese Patent Publication No.56-13143 JP-A-7-4416 JP 11-79556 A JP-A-11-208996 JP 2001-89030 A JP 2001-240168 A

  By the way, in the above-mentioned Patent Document 1, the unstretched tow is traversed in a zigzag manner while traversing the half of the tow packing container with an ejector, while the other half part containing the tow is pushed into the container with one of the pair of pushing plates. In order to do this alternately for each half of the container, the pushing plate on the toe transfer side must be retreated from the pushing position to a position that avoids interference with the tow, and the pushing plate swing mechanism and timing control are required. This complicates the mechanism and timing control. Furthermore, in Patent Document 4, the mechanism of the entire apparatus is further complicated, and high productivity is difficult to obtain.

  In a more preferable example of the above-mentioned Patent Document 2, gas is alternately ejected from the left and right in a high cycle with respect to the falling tow, and the container is shaken off while being waved. It is traversed in the axial direction. Therefore, not only the traverse mechanism is complicated, but also it is difficult to stabilize the laminated structure of the tows in the container. Also, in the above Patent Document 3, air is alternately blown from both sides of the tow, dropped into a zigzag, and stored while being shaken down in a container that traverses in the uniaxial direction below, so that the traverse mechanism is simplified compared to Patent Document 2. . However, when air is blown to the falling tow from the left and right, fluff is induced, and when a plurality of thin tows are used as a converged tow, it is easily divided into the original thin tows. End up. In addition, there is a possibility of twisting the yarn.

  In addition, although the mechanism is simple in the above-mentioned Patent Document 5, since it is intended to apply a compressive load due to the weight of the holding member, it is unavoidable to make the facility excessive when attempting to increase the packing bulk density. . In the above-mentioned Patent Document 6, since the moisture content of tow is set as high as 3 to 150 wt%, packaging work such as film sealing work, oxygen scavenger sealing, degassing, gas replacement, and heat treatment as antiseptic measures. Make it complicated.

  Furthermore, in the production of carbon fiber, in order to increase productivity and further cost reduction, when packing the thick fiber carbon fiber precursor tow and the flame resistant fiber precursor tow as described above, It has been desired to pack the container by further increasing the storage bulk specific gravity of the tow stored in the container and efficiently transport the tow to a subsequent carbon fiber manufacturing process such as a firing process.

The present invention has been made for the purpose of solving such various conventional problems. Specifically, it realizes stable storage of straight yarns with a large fineness in a container and maximization of the packing weight. In addition, there is no need for special troublesome work such as antiseptic treatment, the tow form is stable, and it can be stably taken out when being taken out of the package, and the tow can be efficiently packed. Another object of the present invention is to provide a method for packing a carbon fiber precursor tow and a flame resistant fiber precursor tow.

In order to achieve the above object, the carbon fiber precursor tow and flame resistant fiber precursor tow packing method according to the present invention comprises a carbon fiber precursor tow and a flame resistant fiber precursor tow having a total fineness of 48000 dtex to 720,000 dtex. A method of transferring and packing into a packing container through a swing chute, wherein 1 to 5 wt% of moisture is given to the tow in advance before the tow is transferred to the packing container, and the tip of the swing chute is swung. Swinging the speed so that it is 0.75 to 1.25 times the spinning speed, the packing container is in the direction orthogonal to the swinging direction of the chute at 1/100 to 1/25 with respect to the spinning speed. thereby reciprocally, the tow imparted with the moisture, in which housing a bulk density of tow to be packed in the packaging container so that 340 kg / m ³ or more, and most major components that comprise the is there.

  Further, in the packing method of the present invention, the packing container is disposed inside the packing container main body made of cardboard and the packing container main body, has substantially the same shape as the inner surface shape of the packing container main body, and is 0.1 mm or less. It is preferable that the tow is housed in the packing container body via the interior material.

  Furthermore, in the present invention, it is preferable that after adding moisture to the tow, the tow is further passed between gear rolls and taken up into the packing container.

Furthermore, in the present invention, it is preferable that air is circulated in the swing chute or air curtain-shaped air is jetted at the tip of the chute to apply a tensile force to the tow. Shi finishing buffing have preferred is possible to prevent the catching of the tow. Also, the swing speed of the swing chute tip, it is preferable to stepwise or continuously increased toward the end of the initial transfer of the tow.

  Further, in the above packing method, it is preferable to press the transfer tow at each folding point of the packing container from the initial stage of the transfer of the tow, and further, an elastic cushioning material is provided on the upper surface of the tow after the transfer of the tow. It is preferable to arrange and compress and pack.

In the packing method of the present invention, before the carbon fiber precursor tow and the flame resistant fiber precursor tow are transferred to the packing container, 1 to 5 wt% of moisture is given to the tow in advance. In this way, if a predetermined amount of moisture is applied to the tow in advance before the tow is transferred to the packaging container, shoot clogging is unlikely to occur, and preservative treatment that prevents the growth of bacteria and fungi before packaging is performed. It is unnecessary. In addition, by providing moisture to the tow, the convergence of the tow stored in the packaging container is ensured. Furthermore, after water | moisture content is given to a tow | tow, a tow | tow is packed in a packing container, and it can pack stably so that the storage bulk specific gravity of a tow | toe may be set to 340 kg / m < ³ > or more. If the tow is packed in this way, for example, when the tow is subsequently pulled out from the packing container, the tow is excellent between the tows and can be pulled out smoothly without generation of fuzz. .

The packaging container for storing the tow is disposed inside the packaging container main body made of cardboard and the packaging container main body, has substantially the same shape as the inner surface shape of the packaging container main body, and has a thickness of 0.1 mm or less. It consists of a moisture-impermeable interior material, and the tow can be accommodated in the packaging container body via the interior material. As a result, when the tow with moisture is transferred into the packaging container, the tow does not directly contact the inner surface of the corrugated cardboard, so that it is not necessary to be damaged by friction, scratching, or the like from the packaging container body. Moreover, even if the packing container main body is made of corrugated cardboard, it is possible to prevent the corrugated cardboard from absorbing moisture given to the tow.

  The material of the interior material constituting the packaging container is not particularly limited, but is preferably a polyethylene sheet that is inexpensive and highly convenient. It is preferable that the interior material be as close as possible to the inner surface of the container and be as thin as possible so as not to disturb the tow transfer form. The thickness of the interior material is 0.1 mm or less, preferably 0.05 mm, and more preferably 0.03 mm. If it is 0.03 mm or less, it is not preferable in terms of damage and cost when filling the interior material to the cardboard. It is preferable that the shape of the interior material is basically the same as the shape of the packaging container main body made of cardboard. For example, if the packaging container body is a square bottom, the interior material is also a square bottom, and if the packaging container body is a round bottom, the interior material is also a round bottom. In addition, after the tow transfer is completed, in order to prevent moisture evaporation of the tow and mixing of foreign matter and foreign matters, it is preferable to wrap the tow once with an interior material before final packaging. As the method, for example, a method such as vacuum packaging or complete sealing can be considered, but there is no particular limitation here, and the effect can be expected with simple packaging.

  In the present invention, it is preferable that after the moisture is given to the tow, the tow is further passed between the gear rolls and taken up into the packing container. At this time, the gear roll can be manufactured by arranging two gear-shaped plates at a predetermined interval and connecting each corresponding gear shape with a pipe in order to simplify the structure. Of course, a normal gear having a required thickness may be used. In the present invention, the member for connecting the corresponding gear shapes is not limited to a pipe, and a round bar, a member with rounded corners of a square member, or the like can be used.

  As described above, if moisture is applied to the tow and then the tow is pulled between the gear rolls, the tow is flattened, and at the same time, a very zigzag shape is imparted to the tow. For this reason, when the tow is swung into the packaging container, for example, the toe can be smoothly folded at the end in the packaging container, and further, the convergence of the tow and the shape stability of the package can be improved. In addition, since the entanglement between the tows is reduced when stored in the packaging container, when the tow is subsequently pulled out from the packaging container, the above-mentioned zigzag shape is eliminated, and the tows composed of straight fiber groups are smoothly formed. It can be pulled out. In addition, as described above, the tow is taken through between the gear rolls so that the tow can be taken up with a small contact area between the tow and the gear roll. Can be stably stored in the packing container.

  In the present invention, a tensile force can be applied to the tow by circulating air in the swing chute or by ejecting air curtain-like air at the tip of the chute. Further, by buffing the inside of the rocking chute, it is possible to prevent the tow from being caught when the tow travels within the rocking chute and to smoothly swing out the tow from the rocking chute.

  In the packing method of the present invention, the swing speed of the chute tip can be swung so as to be 0.75 to 1.25 times the spinning speed. As a result, the tow can be fed evenly from end to end in the packing container, and the tows can be straightened in the container without creating a useless gap in the packing container. Such a tow storage form makes it possible to minimize the number of times the tow is folded in the packing container, and as a result, the packing bulk density is maximized.

In this case, the packing container can be reciprocated in the direction orthogonal to the swinging direction of the chute at 1/100 to 1/25 with respect to the spinning speed. As a result, the tow can be evenly transferred to the transfer surface of the packing container, and the tow transferred to the packing container can be prevented from falling obliquely due to the reciprocating movement of the container, and the position of the tow transferred into the packing container can be prevented. It is possible to prevent the shift. Furthermore, the swing speed of the tip of the swing chute can be increased stepwise or continuously from the beginning to the end of the tow transfer, so that the tow can be transferred from the stage where the transfer surface is low to every corner of the packaging container. It becomes possible.

  Moreover, this invention can press with respect to the transfer tow | toe for every folding | turning point of a packaging container from the initial transfer stage of a tow | toe. The pressing at this time starts at an early stage of transfer, that is, a stage where the height position of the tow into which the container is transferred is at the bottom of the container. Such pressing from the initial stage of tow transfer achieves maximization of the storage density of the tow stored in the packing container. The frequency of pressing is performed at the turn-back points on both ends as the container reciprocates. The detection of the folding positions at both ends in the reciprocation of the container can be performed with high accuracy, for example, by a phototube switch. Moreover, since it is necessary to make the press apparatus which presses a transfer tow follow the height position (toe transfer surface) of the transfer tow which raises gradually in a container, it is preferable to drive with an air cylinder. In this case, in order to perform the pressing from the early stage of the toe transfer until the transfer is completed, it is necessary to increase the stroke length of the press device according to the packing container. Therefore, for example, the stroke length can be ensured by arranging two or more cylinders in series.

  Furthermore, in the present invention, an elastic cushioning material can be arranged on the upper surface of the tow after the toe transfer is completed, and then compressed and packed. As a result, for example, when the tow is transported after being packed in a packing container, vibrations to the tow during transportation can be reduced, and further, the occurrence of a gap in the upper part of the container formed by sedimentation of the tow is suppressed. can do. In this case, the material of the cushioning material is not particularly limited, and any material having a repulsive force may be used. This material is desirably inexpensive and excellent in workability, and there is no particular problem even if it is a foamed polystyrene or a commercially available pneumatic cushioning material.

And the carbon fiber precursor tow and the flame resistant fiber precursor tow packaged by the packing method of the present invention are packed with a tow having a total fineness of 48000 dtex to 720,000 dtex and a bulk density of 340 kg / m ³ or more. It is a package packed in a container. In this way, if the package of the present invention has a very high storage bulk density of tow, a large amount of tow can be packed more compactly than before in a predetermined size packaging container. The precursor tow can be efficiently transported to a carbon fiber production process such as the above. Thereby, it contributes to the improvement of productivity of carbon fiber and can aim at the cost reduction of carbon fiber. In addition, the increased bulk density of the tow in the package stabilizes the form of the package. For example, the package is less likely to lose its shape when the package is transported.

It is process explanatory drawing which shows the typical packing process of the carbon fiber precursor tow of this invention, and a flame-resistant fiber precursor tow schematically. FIG. 6 is a process diagram in which a plurality of small tow widths after moisture application are uniformly reduced and a constituent filament for each small tow is entangled. It is a process figure which puts together the small tow | toe which drive | works at a distance in one flattened thick fineness tow. It is the three-dimensional view which looked at the toe delivery part which sends out the toe of a large fineness to a toe introduction part from the slant front. It is a three-dimensional view which shows an example of the external appearance of the toe introduction part and toe transfer machine applied to a present Example. It is a three-dimensional view showing a structural example of a gear roll applied to the present embodiment. It is a three-dimensional view showing a structural example of a toe transfer chute applied to the present embodiment. It is a partial front view which shows the modification of the toe transfer chute. It is a three-dimensional view showing the structure of the extended chute of the chute. It is a three-dimensional view showing a structural example of a container reciprocating drive conveyor applied to the present embodiment. It is a three-dimensional view showing a structural example of a press device applied to the present embodiment. It is an expansion three-dimensional view which shows the external appearance form of the tow packing container at the time of the toe transfer by a present Example. It is a three-dimensional view showing a packing form after tow packing according to the present embodiment.

  Hereinafter, a carbon fiber precursor tow having a total fineness of 48000 dtex to 720,000 dtex of the present invention, a method for packing a flame-resistant fiber precursor tow, a packing device for carrying out the method, and a suitable packing container used for the packing DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be specifically described with reference to the drawings based on the illustrated examples.

FIG. 1 is a process explanatory view schematically showing the entire packing process for packing a carbon fiber precursor tow and a flame resistant fiber precursor tow following a spinning process according to a typical embodiment of the present invention.
According to this embodiment, a plurality of drying rolls 11 are arranged in parallel in a state where three small tows 1 made of an aggregate of acrylic fibers having a single yarn fineness of 1.2 dtex and a filament number of 50000 obtained by wet spinning are arranged. The drying step 10 is continuously introduced and dried. After that, with a touch roll-type moisture imparting means in which a part of the touch roll 13 is immersed in the water tank 12 disposed immediately before the tow outlet of the drying step 10, 1 to 5 wt% of moisture is given to the small tow 1. Give. For example, in this example, for example, when the spinning speed is 40 m / min, the amount of moisture applied to the small tow 1 can be 1.5 wt%, and when the spinning speed is 65 m / min, The amount of moisture applied to the small tow 1 can be 4 wt%.

  In the present invention, the moisture applying means is not limited to the touch roll method, but can also apply 1 to 5 wt% of moisture to the small tow 1 by, for example, spraying with a spray nozzle. . Furthermore, it is desirable to apply moisture to the tow at the stage of flattening the small tow before converging and becoming a fine toughness tow, but the present invention is not limited to this. It is also possible to give water to the tow after forming the fineness tow.

  Further, for example, the application of moisture to the tow can be arbitrarily changed depending on the time until the tow is unpacked after being packed and pulled out from the packing container, the transportation conditions, etc., but the preferred range is 1 to 5 wt%. In this way, when the amount of water given to the tow is set to 1 to 5 wt%, there is no growth of bacteria and mold even for long-term storage, and even when transferred to the packaging container 63, The tow form is stable even when supplied from the container to the drawer firing process, and as a result, there is no deterioration in quality in the subsequent firing process, and a sufficiently high quality product required as carbon fiber can be obtained. .

  As shown in FIGS. 1 and 2, the three small tows 1 to which moisture has been applied as described above are once narrowed so that the tow width becomes equal, and each is independently the next process. It is fed simultaneously to the single fiber entanglement step 20 in which the constituent fiber filaments of the small tow 1 are entangled. In the single fiber entanglement step 20, a pair of upper and lower flat nozzles 21 each having a large number of air ejection holes (not shown) for each small tow 1 are arranged vertically with a predetermined gap. The three small tows 1 fed simultaneously in parallel to the single fiber entanglement step 20 are introduced into the gaps between the flat nozzles 21 arranged independently of each other, where air is blown to the small tows 1. For each one, the constituent filaments are entangled. In the present embodiment, the air pressure blown at this time is set to 100 kPa, and at the same time, the tension is controlled so that the tension of each small tow 1 becomes 700 g.

  The small tows 1 that have been entangled with each other in the single fiber entanglement step 20 are introduced into the toe shifting step 30 shown in FIG. After being made into a flattened large-fineness tow 2 consisting of 150,000 constituent filaments, the constituent filaments between adjacent small tows are entangled by an unshown entanglement device, and the tow is the next step. It is sent to the transfer machine introduction unit 50. As shown in FIGS. 1 and 4, a tow feed part 40 having a plurality of feed rolls 41 is disposed between the tow transfer machine introduction part 50 and the tow feeding process 30. The amount of feed by the roll 41 is controlled to control the tension of the small tow 1 in the single fiber entanglement step 20. The tow 2 having a large fineness that has become a single piece in the toe gathering process 30 is guided by a plurality of guide rolls 42 and travels substantially horizontally, and is guided by a turning roll 51 by the toe transfer machine introduction section 50. The direction is changed vertically downward, and the sheet is fed between the pair of gear rolls 61 of the toe transfer machine 60 installed immediately below.

  As shown in FIG. 5, the tow transfer device 60 has a tow introduction opening 62 a opposed to a tow feed position between a pair of left and right gear rolls 61 and a pair of gear rolls 61, and an upper end thereof. A tow transfer chute 62 supported so as to be able to swing in the same vertical plane with the vicinity of the toe introduction opening 62a as a swing center, and a tow packing container 63 placed under the tow transfer chute 62 A container reciprocating drive conveyor 64 that reciprocates the tow packing container 63 in a direction orthogonal to the swinging direction of the tow transfer chute 62, and a reciprocating return position of the tow packing container 63. And a pair of front and rear press devices 65.

  In the present embodiment, each of the gear rolls 61 is opposed to two disks 61a having the same shape in which a large number of the same number of gear teeth are formed at equal intervals on the outer peripheral edge, as shown in an enlarged view in FIG. And each end of a pipe or round bar 61b is fixed between the tops of adjacent gear teeth of each disc 61a, and the discs 61a are connected to each other. At this time, the pipe or round bar 61b is fixed to the disc 61a by exposing half of its cross section from the outer peripheral edge of the disc 61a to the outer diameter side. In the present invention, as a member for connecting the discs 61a to each other, for example, a member obtained by rounding the corners of square bars can be used in addition to the pipe or the round bar 61b as described above.

  With such a gear roll structure, it is possible to reduce the weight and reduce the material and gear production costs. In addition, for example, if a pipe or a round bar 61b is fixed to the disc 61a by using bolts and nuts as means for fixing the end of the round bar 61b, it can be easily replaced even if a part of the pipe or the round bar 61b is damaged. In addition, the maintenance becomes easy. Thus, since the zigzag waveform is formed on the tow 2 by passing the tow 2 fed from the tow transfer machine introduction unit 50 through the gear roll 61, the constituent fibers of the tow 2 are combined with the required amount of moisture. The flattening form is further stabilized.

The toe transfer chute 62 is made of a metal plate made of stainless steel, aluminum alloy, copper alloy, or the like, and is formed of a rectangular cylinder manufactured by press-working the metal plate and then welding. According to the present embodiment, as shown in FIG. 7, the opening cross section of the toe introduction opening 62 a of the toe transfer chute 62 is close to a square, and the opening cross section of the intermediate portion 62 b is the inner wall spacing in the swinging direction of the chute 62. Is formed in a rectangular shape that is narrowed to about ½ of the gap perpendicular to the swinging direction, and the opening cross section of the toe swing opening 62c at the lower end thereof is further made to be more than the rectangular intermediate opening cross section. The rectangular opening cross section is made thinner in the swinging direction of the chute 62 in succession to the toe introduction opening 62a, the intermediate part 62b, and the toe swing opening 62c. Incidentally, the opening width in the toe width direction and the toe thickness direction of the tow introduction opening 62a are both 150 mm, but the opening widths in the toe width direction and the tow thickness direction at the intermediate portion 62b are reduced to 100 mm and 45 mm, respectively. Furthermore, the opening width in the toe thickness direction is 30 mm at the swing opening 62c.
It is said. In this case, it is preferable that the length in the toe width direction of the intermediate portion 62b and the swing opening 62c of the chute 62 is set to be approximately twice the width of the tow introduced into the chute 62 so that there is a margin in the width direction. .

  As a more preferable embodiment, as shown in FIGS. 8 and 9, an extended chute 62d 'is provided at the opening of the chute body 62d having a uniform rectangular cross section. In this case, the shape of the upper end portion of the extension chute 62d ′ is approximately 30 mm, with the inner dimension in the toe width direction being about three times the toe width, and the opening dimension in the toe thickness direction being reduced toward the transfer side. It is preferable that By providing the extended chute 62d ′ having such a shape at the opening of the chute main body 62d, an air curtain-like air flow for applying a pulling force in the swinging direction to the tow 2 traveling in the chute described later is created. It is possible to provide an air supply unit serving as a tensile force applying unit (not shown). As a result, the tow 2 can be smoothly run without being clogged in the transfer chute 62 and can be stably swung out from the extended chute 62d '. As a matter of course, the dimensions of the chute 62 and the extended chute 62d 'can be appropriately set according to the total fineness of the tows to be packed.

  In this way, since the rectangular opening is formed thin in the swinging direction (toe thickness direction) without changing the rectangular opening in the toe width direction at the toe swinging end of the chute 62, twisting of the tow 2 traveling inside the chute 62 can be prevented. Even when it is swung downward, the tow does not twist and can maintain a tape-like flat shape. Further, in this embodiment, as shown in FIG. 5, in order to apply a pulling force in the swing direction to the tow 2 traveling in the chute 62, an air flow is directed toward the inside of the chute 62 at the toe introduction opening 62a. An air supply section 62 ″ is provided. Instead of this air supply section 62 ″, an air supply section for generating an air curtain-like air flow in the direction of the outflow is provided in the vicinity of the toe swing opening 62c of the chute 62. You can also. A buffing finish is applied to the inner surface of the chute 62 so that the tow 2 is not damaged by friction in the chute 62 when the thick tow 2 passes through the chute 62.

  Further, as shown in FIG. 5, the toe transfer chute 62 according to the present embodiment has a bracket 62 ′ made of a plate material at the upper end of one of the left and right side surfaces when the chute 62 is swung back and forth. The lower half portion is fixed by welding or the like, and the central portion of the upper half portion of the bracket 62 ′ is coupled to a rotating shaft driven and rotated by a drive source (not shown) via a swing mechanism such as a cam, The bracket 62 'swings the entire chute 62 with a required swing width with the axis of the rotation shaft as the swing center. At this time, the swinging width of the toe swing opening portion of the chute 62 is substantially matched with the inner dimension in the transfer direction of the packing container 63 disposed below. As the swing mechanism, a known mechanism such as a cam or a link mechanism can be adopted as described above. Further, the width of the reciprocating motion may be directly controlled by a servo motor. That is, the flat tow 2 having a large fineness sent downward through the gear roll 61 is introduced into the toe transfer chute 62. At this time, the whole of the chute 62 from the toe introduction opening 62a to the toe ejection opening 62c at the front end is reached. Oscillates in the same direction via the bracket 62 ′, and thus travels smoothly inside the chute 62.

In this embodiment, the swing speed of the chute 62 is set so that the swing speed of the tip portion on the toe swing side of the chute 62 is 0.75 to 1.25 times the spinning speed. As described above, when the swing speed at the tip of the chute 62 is 0.75 to 1.25 times the spinning speed of the tow 2, a large amount of the tow 2 is swung out from the swing opening of the chute 62. , It is not shaken out little. Therefore, it is possible to reliably return the tow at the position where the tow is folded in the packing container 63, so that the tow 2 can be reliably transferred to the end of the packing container 63 in the traverse direction, and can be evenly stored on the entire surface of the packing container 63. become. At the same time, the number of tow folds inside the packaging container 63 can be minimized, and as a result, the bulk density of the packaging can be maximized. Further, in the present embodiment, the swing speed of the tip of the swing chute 62 can be increased stepwise or continuously from the initial to final transfer of the tow. Thereby, it becomes possible to transfer a tow from the stage where a transfer surface is low to every corner of a packing container, and the storage bulk specific gravity of the packed tow can be made still larger.

  The container reciprocating drive conveyor 64 is a roll conveyor as shown in FIGS. 5 and 10, and a plurality of parallel rotating rolls 64 a are arranged on the same horizontal plane in a direction orthogonal to the swinging direction of the chute 62. . These rotary rolls 64a are fixed to the shaft end of an excessive follower roll via a chain wheel (not shown) that is fixed to the roll shaft end of a drive roll that reciprocally rotates by a single drive shaft (not shown). The chain wheel is connected to the chain wheel via a chain (not shown), and rotates synchronously in the same direction. In this embodiment, a phototube type detector 64c is arranged on a part of the support frame 64b of the rotating roll 64a, whereby the tow packing container 63 transferred on the conveyor 64 reaches a predetermined position. The detection signal is sent to a control unit (not shown), and when the signal is received, the drive source of the rotating roll 64a is reversed by a command from the control unit, and the tow packing container 63 is placed at a predetermined position. Let it fold and repeat this.

  The reciprocating speed of the packing container 63 is set to 1/100 to 1/25 with respect to the spinning speed. By reciprocating the tow packing container 63 in the range perpendicular to the transfer direction of the tow 2, the tow 2 transferred to the packing container 63 is prevented from falling down obliquely, and uniform tow storage is possible. .

  Further, in this embodiment, as shown in FIG. 5, a pair of the above-mentioned presses are disposed above and behind the tow 2 to be transferred from the chute 62, respectively, above the respective folding positions of the tow packing container 63. A device 65 is arranged. As shown in FIG. 11 in an enlarged manner, each of these press devices 65 includes a multistage cylinder 65a and a press member 65b made of a plate material in which the extendable ends of the cylinders 65a are fixed at the center. The multistage cylinder 65a is suitable for ensuring a required stroke length and reducing the overall length of the cylinder. In the present invention, since the pressing by the pressing device 65 is performed from the initial stage of transferring the tow 2 even for the large tow packing container 63, and it is necessary to follow the toe transfer surface gradually rising at the same time. The expansion / contraction stroke by 65a needs to be made longer than usual. According to this embodiment, the two-stage cylinder 65a is employed to cope with such a point. Further, when pressing, the tow packing container 63 is reciprocated perpendicular to the transfer direction of the tow 2, and the packing container reciprocates during the pressing time. For this reason, in order to make a press apparatus follow a packing container, it is more preferable that the press apparatus attachment part is attached by the hinge mechanism which can be rock | fluctuated in the same direction as a packing container reciprocation.

  As shown in FIGS. 5 and 9, the pressing member 65 b is manufactured from a metal plate material having substantially the same shape as the bottom shape of the tow packing container 63. In order to ensure the strength and rigidity of the peripheral portion of the metal plate material, a reinforcing wall 65b 'is erected on the peripheral edge, and the lower surface of the metal plate material and the outer surface of the reinforcing wall 65b' are buffed. Finishing is performed to prevent the occurrence of fluff at the time of pressing the tow 2 in the container. Further, particularly in the present embodiment, the opposing side surfaces of the pair of press members 65 arranged in the front and rear have inclined walls 65b ″ that rise obliquely in a direction away from each other. When the press members 65 are alternately operated, a wall surface is formed for directing the tow 2 toward the transfer side so that the tow 2 continuously transferred from the chute 62 does not enter the operation side region of the press device 65. Yes.

That is, in the present invention, when the tow 2 is transferred into the packaging container 63, the pressing is performed from the start of the transfer of the tow 2, and the transfer of the tow 2 is continued in the half of the packing container 63 simultaneously with the pressing. The press timing is performed in the half on the opposite side when the packaging container 63 is folded back. The position detection at this time is detected by the photoelectric tube detector 64c as described above. When one press member 65b is operated at the turn-up position of the toe packing container 63, the other press member 65b is in the upper standby position. At this time, the transfer of the tow 2 continues on the side of the press member 65b waiting at the same time. Has been done. At this time, the tow 2 that is transferred by the inclined wall 65b ″ of the press member 65 on the press side is surely directed to the transfer side so that the tow 2 does not enter the press side.

  The pressing member 65b is made of a stainless steel porous plate. This is because when the press member 65b descends and presses the tow 2, it facilitates the escape of air, prevents the yarn from being disturbed by wind pressure, and removes the air existing between the filaments of the tow 2 to be pressed. Because. The opening ratio is preferably 20 to 40%. Moreover, the hole diameter is set to 5 to 15 mm so that the tow 2 does not enter. Incidentally, in this embodiment, the hole diameter is 10 mm, the pitch is 17.5 mm, the hole area ratio is 30%, and the zigzag arrangement is performed, and the press surface is finished by buffing so that the tow 2 is not caught. .

  In the present embodiment, in order to evenly swing the tow 2 to every corner of the packaging container 63, the tip swing width of the chute 62 is made the same as the inner dimension of the packaging container 63 as described above. Therefore, when the transfer surface of the tow 2 rises, the tow 2 may overflow outward from the upper end of the packaging container 63. Therefore, in this embodiment, the upper end opening of the toe packing container 63 having a rectangular opening surface expands in a tapered shape as shown in FIG. 12, and further tightly fits inside the upper end opening of the packing container 63. An auxiliary member 66 having a flange-like fitting portion 66a is prepared in advance. The auxiliary member 66 may be made of any material, but is preferably made of stainless steel whose inner surface is buffed to avoid damage to the tow 2. By fitting this auxiliary member 66 to the upper end of the container, overflow of the tow 2 due to the swing of the chute 62 can be prevented, and the tow 2 can be filled beyond the upper end of the packing container 63 after pressing. That is, by attaching the auxiliary member 66, the apparent container depth can be increased, and as a result, the tow 2 can be packed higher than the upper end opening surface of the packing container 63 before pressing, and the tow 2 is outside the container. Prevent overflow. Moreover, after the storage of the tow 2 is completed, it is compressed and packed through the cushioning material 68 described later, so that the storage bulk density of the tow in the container can be further increased.

  Here, Table 1 shows the case where the press operation was not performed with the swing speed of the chute tip set to 0.8 times, 1.0 times, and 1.25 times the spinning speed in the above-described embodiment. (Examples 1 to 3), when the press operation was performed by setting the rocking speed of the chute tip to be equal to the spinning speed (Example 4), and the rocking speed of the chute tip was 0 of the spinning speed. When the press operation is not performed by setting 0.55 times that deviates from .75 times to 1.25 times (Comparative Example 1), the packing weight and the storage bulk specific gravity of the tow packed in the packing container are shown. . In Examples 1 to 4 and Comparative Example 1, 1.5 wt% of moisture was given to the tow before the tow was transferred to the packaging container.

  Table 2 shows that when the spinning speed is 65 m / min (that is, the amount of moisture applied to the tow is 4 wt%), the swing speed of the chute tip is 0.8 times the spinning speed (Example 5). When the swing speed of the chute tip is set to 0.82 times the spinning speed at the initial stage of transfer, and then the swing speed of the chute tip is gradually increased to 1.0 times the spinning speed (Example 6). And the packing weight and storage bulk specific gravity of the tow packed in the packing container about the case where the swing speed of the chute tip is 0.55 times the spinning speed (Comparative Example 2) are shown. In Example 6, the swing speed of the chute tip is 0.82 times for 5 minutes from the start of transfer, 0.87 times for 26 minutes, and then 0.93 for 109 minutes. The remaining time was increased stepwise by 1.0 times.

As can be understood from Table 1, in the present invention, by setting the rocking speed of the chute tip within the range of 0.75 times to 1.25 times the spinning speed, the storage bulk specific gravity of the tow is surely 340 kg. The tow can be packed in a packing container so that it becomes more than / m ³ . In particular, the tow storage bulk specific gravity can be further increased by making the swing speed of the chute tip equal to the spinning speed as in the second embodiment.

  Further, as shown in the fourth embodiment, there is a storage method in which the swing speed of the chute tip is made equal to the spinning speed, and the tow 2 in the packing device is pressed by the press device 65 every time the packing container 63 is reciprocated. By adopting it, it becomes possible to pack a tow with the largest storage bulk specific gravity.

  Further, as can be understood from Table 2, by gradually increasing the swing speed of the chute tip as in Example 6, it is possible to store the tow to every corner of the box, and the storage bulk density of the tow is increased. It can be made even larger.

On the other hand, as shown in Comparative Example 1, the swing speed of the chute tip is extremely slower than the spinning speed (the swing speed is 0.55 times the spinning speed), and if the press operation is not performed, Are not arranged straight in the packaging container, but meanderingly stored. Further, in this case, the number of places where the tow that has been stored overlaps and an appropriate press is not performed, and as a result, the storage bulk specific gravity of 340 kg / m ³ or more cannot be obtained. Also, in Comparative Example 2, since the swing speed of the chute tip was extremely slower than the spinning speed, the tow was not aligned straight in the packing container, resulting in a storage bulk specific gravity of tow of 340 kg / m ³ or more. Couldn't get.

That is, as shown in Table 1, in Comparative Example 1, the rocking speed of the chute tip was extremely slower than the spinning speed and no pressing operation was performed, so that the tow storage bulk specific gravity was 340 kg / m ³ or more. I couldn't pack the tow so that. On the other hand, in Examples 1 to 4, in addition to applying water of 1.5 wt% to the tow before the tow was transferred to the packing container, the swing speed of the chute tip was set to 0.75 of the spinning speed. By setting the magnification to 1.25 to 1.25 times, the storage bulk specific gravity of the tow could be reliably increased to 340 kg / m ³ or more. Moreover, it turned out that it becomes possible to accommodate a tow | toe in a packaging container by very big storage bulk specific gravity of 494 kg / m < ³ > by adding press operation like Example 4. FIG. Further, as shown in Table 2, it was found that the storage bulk specific gravity can be further increased by gradually increasing the swing speed of the chute tip.

  Next, the preferable Example of the packing container 63 used for the packing method of this invention is described concretely. FIG. 12 shows the appearance of the tow packing container 63 according to this embodiment. As the material of the packaging container 63, it is desirable to use corrugated cardboard from the viewpoint of economy. The transfer tow 2 to be transferred to the packing container 63 by the method of the present invention contains the required moisture. For this reason, it is necessary to prevent the cardboard from absorbing moisture due to the moisture of the tow 2 in addition to not being damaged by friction, scratching, etc. due to the contact between the inner surface of the cardboard and the tow. Therefore, in the present embodiment, the interior material 67 is interposed inside the packaging container 63 formed of cardboard. The material of the interior material 67 is not particularly limited as long as it has waterproofness, but is preferably a sheet material made of polyethylene in view of convenience at low cost.

  It is desirable that the interior material 67 is as thin as possible so as to be as close as possible to the inner wall surface of the corrugated tow packaging container 63 and not disturb the transfer form. The thickness of the interior material 67 is 0.1 mm or less, preferably 0.05 mm, and more preferably 0.03 mm. If it is 0.03 mm or less, it is easy to break when the interior material 67 is interposed in the packaging container 63 made of corrugated cardboard. It is desirable that the shape of the interior material 67 is basically the same shape as the packaging container. After the toe transfer is completed, it is preferable to wrap the tow 2 once with the interior material 67 before final packing in order to prevent moisture evaporation of the tow and mixing of foreign matter and foreign matters. As the method, for example, a method such as vacuum packaging or complete sealing is conceivable, but there is no particular limitation here, and the purpose can be sufficiently achieved even with simple packaging.

  Further, in this embodiment, after the transfer tow 2 is packaged with the interior material 67, an elastic cushioning material 68 is further disposed on the transfer surface from above. The material of the buffer material 68 is not particularly limited as long as it has a repulsive force. Considering the point of being inexpensive and excellent in workability, a foamed polystyrene or a commercially available film sheet-like cushioning material 68 in which air is filled in a polka dot shape is suitable. By attaching the above-described auxiliary member 66 for preventing tow overflow to the upper end portion of the packaging container 63, the tow 2 can be raised and swung up by 50 to 80 mm from the upper end of the packaging container 63, and in this state, the cushioning material 68 is moved to the tow. It arranges on 2 transfer surfaces and compresses and packs through the interior material 67. By packing in this way, the housed tow 2 is reduced in vibration during transportation, and further, the generation of a gap due to the sinking of the tow 2 can be suppressed. The corrugated cardboard constituting the packaging container 63 is preferably thicker than usual so as to have sufficient strength, for example, a corrugated cardboard material having a structure laminated in two or more stages.

  In order to facilitate handling of the empty or packed tow packing container 63 made of corrugated cardboard, it is preferable to use the pallet 69 attached to the lower surface of the tow packing container 63.

In this case, the tow packing container 63 may be placed and handled on a separately prepared pallet, but in this embodiment, it is preferable that the pallet 69 is integrally attached to the lower surface of the packing container 63. When the packing container 63 and the pallet 69 of the tow 2 are structured to be detachable so that the packing container 63 and the pallet 69 can be easily separated, the packaging container 63 is assembled, the tow 2 is transferred, or the packaging is performed. It becomes easy to handle during later transportation.

  Since the pallet 69 is usually handled using a forklift after the tow 2 is swung into the container, the pallet 69 has a structure in which the fork part of the forklift can be inserted in the same manner as a normal pallet. The material of the pallet 69 is not particularly limited as long as it has excellent durability and water resistance, but corrugated paper which is the same material as the tow packing container 63 is preferable in view of its handling property and cost including reuse. In this case, a plurality of corrugated cardboards are laminated and fixed to the portion constituting the leg portion of the pallet 69, and the corrugated core portion is cut at a required width so as to be orthogonal to the length direction of the corrugated core portion. If used, sufficient durability can be secured in terms of strength.

  Similarly, the lid body 70 of the toe packing container 63 is also made of corrugated paper, and as shown by the phantom line in FIG. By adopting such a configuration, when performing banded packaging, a uniform load is applied to the transfer surface, the shape of the stored tow 2 is stabilized, and the stacked items can be stacked during transportation. This is also advantageous in terms of transportation cost. At the time of packing, it is preferable to fix with the fastening tape 71 such as a plastic band at least two or more of the whole so that the lid body 70, the packing container 63, and the pallet 69 are integrated.

As described above, according to the packing method of the present invention, before the tow having a total fineness of 48000 dtex to 720,000 dtex is transferred to the packing container, 1 to 5 wt% of moisture is given to the tow in advance. Therefore, clogging of tow is difficult to occur, and the convergence of tow is ensured. Furthermore, after water | moisture content is given to a tow, it can pack stably so that the storage bulk specific gravity of a tow may be set to 340 kg / m < ³ > or more by transferring and packing a tow into a packing container.

  If the tow is packed after adding 1 to 5 wt% of moisture to the tow in this way, the thick tow can be stably packed in a packing container with a large storage bulk density, and the antiseptic treatment is specially made. Even if it is not performed, it is possible to prevent bacteria and molds from being generated on the tow after packing. Furthermore, the shape of the packed tow is stable and is not easily lost. In addition, for example, when the tow is picked up from a package in which the tow is packed, the tow can be picked up smoothly without generation of fuzz and the like because the tow is excellent between the packed tows.

Furthermore, if the packaged bulk density according to the present invention is 340 kg / m ³ or more, a very large amount of tow can be compactly packed in a packing container of a predetermined size. For this reason, for example, the precursor tow can be efficiently transported to a carbon fiber production process such as a subsequent firing process, which contributes to an improvement in carbon fiber productivity and a reduction in carbon fiber cost. Can be achieved.

  The present invention can be effectively applied when packing a carbon fiber precursor tow having a total fineness of 48000 dtex to 70000 dtex and a flame resistant fiber precursor tow in a packing container.

DESCRIPTION OF SYMBOLS 1 Small tow 2 Thickness tow 10 Drying process 11 Drying roll 12 Water tank 13 Touch roll 20 Single fiber entanglement process 21 Flat nozzle 30 Toe-feeding process 31 Curved member 40 Tow sending part 41 Feed roll 42 Guide roll 50 Toe transfer machine introduction Part 51 Directional roll 60 Toe transfer machine 61 Gear roll 61a Gear disk 61b Pipe or round bar 62 Chute 62 'Bracket 62a Tow introduction opening 62b Middle part 62c Toe swing opening 62d Chute body 62d' Extension chute 62 "Air supply Part 63 Tow packing container 64 Container reciprocating drive conveyor 64a Rotating roll 64b Support frame 64c Photoelectric tube detector 65 Press device 65a Multistage cylinder 65b Press member 65b 'Reinforcement wall 65b "Inclined wall 66 Auxiliary member 66a Flange-like fitting 67 interior material 68 buffer material 69 pallet 70 lid 71 tightening tape

Claims (8)

A method of transferring and packing a carbon fiber precursor tow having a total fineness of 48000 dtex to 720,000 dtex and a flame resistant fiber precursor tow into a packing container through a swing chute,
Before transferring the tow into a packaging container, applying 1 to 5 wt% of moisture to the tow beforehand.
Swinging the swinging speed of the tip of the swinging chute to be 0.75 to 1.25 times the spinning speed;
Reciprocating the packing container in a direction orthogonal to the swinging direction of the chute at 1/100 to 1/25 with respect to the spinning speed;
Packing the tow with the moisture in the packing container so that the storage bulk specific gravity of the tow is 340 kg / m ³ or more ;
A carbon fiber precursor tow and a flame-resistant fiber precursor tow packaging method comprising:   A non-moisture permeable interior having a packaging container body made of corrugated cardboard and a packaging container body which is arranged inside the packaging container body and has substantially the same shape as the inner surface shape of the packaging container body, and has a thickness of 0.1 mm or less. The packaging method according to claim 1, wherein the tow is housed in a packaging container body through the interior material.   The packaging method according to claim 1 or 2, wherein after the moisture is given to the tow, the tow is further passed between gear rolls and taken up into the packaging container.   The packaging according to any one of claims 1 to 3, wherein air is circulated in the swing chute or air curtain-shaped air is jetted at the tip of the chute to apply a tensile force to the tow. Method.   The packing method according to claim 1, wherein the swing chute is buffed to prevent tow catching. The packing method according to any one of claims 1 to 5 , wherein pressing is performed on the transfer tow at each turn-back point of the packing container from an initial stage of transfer of the tow.   The packing method according to claim 1, wherein an elastic cushioning material is disposed on the upper surface of the tow after completion of the toe transfer, and the packing is compressed. The packing method according to any one of claims 1 to 7 , wherein the swing speed of the tip of the swing chute is increased stepwise or continuously from the beginning to the end of the tow transfer.

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