JP4856519B2 - Method for packing carbon fiber precursor tow and flame resistant fiber precursor tow - Google Patents

Description

  The present invention relates to a method for packing a carbon fiber precursor tow and a flame resistant fiber precursor tow.

  In order to reduce the cost by increasing the productivity of carbon fiber, a thick carbon fiber precursor tow having a filament number of 50000 or more has been adopted, and as a result, the tow package has been enlarged. In order to increase the size of the tow package, it is advantageous to use a packing method by dropping the tow, and conventionally, various packing methods by dropping the tow have been proposed.

  For example, in Patent Document 1, the carbon fiber precursor tow having a high fineness is provided with 1 to 3 wt% of water, then flattened, and transferred to the packing container through a swinging chute that swings in one direction. The packaging container is reciprocated in a direction orthogonal to the swinging direction of the swinging chute. Moreover, the tow | toe accommodated alternately by the press board is pressed from the top in the front-back folding position of a packaging container from the time of the transfer start of a tow | toe. According to Patent Document 1, it is possible to maximize the packing weight and maintain the packing form.

Further, for example, Patent Document 2 discloses a device that imparts a traverse motion to a supplied tow and stores the tow in a packing container. At the start of tow storage, the toe swinging end is inserted into the packaging container, and during the storing operation, the packing container is continuously lowered to keep the distance between the toe transfer surface and the toe swinging end in the range of 1 to 50 cm.
JP 2005-15939 A JP 47-35244 A

  By the way, in patent document 1, the height position of the swing chute is being fixed to the upper part of a packaging container. For this reason, the gap between the transfer surface and the toe discharge end is greatly opened during transfer and is greatly affected by air resistance and the like, and there is a possibility that a transfer form defect such as tow twist may occur. If the distance between the toe transfer surface and the toe output end is kept constant as in Patent Document 2, this effect can be minimized.

  However, even if the distance between the toe transfer surface and the toe output end is kept constant, when the press plate descends at the time of transfer, an entrainment flow to the upper portion of the press plate is generated. When the tow is caught on the upper part of the press plate by this entrainment flow, the malfunction of the apparatus and the remarkable deterioration of the transfer form are caused. If the press plate is thickened, it will be easier to prevent catching, but the air flow generated in the packaging container when the press plate descends will be further disturbed, and the followability to the swing chute of the tow will be worsened, and the transfer form May get worse.

  The present invention has been made for the purpose of solving such various conventional problems. Specifically, the present invention can stably store a carbon fiber precursor tow and a flame resistant fiber precursor tow having a high fineness in a packing container in a good transfer form, and when the tow is pulled out from the package, the tow is twisted or broken. It is an object of the present invention to provide a packaging method for a carbon fiber precursor tow or the like, which can obtain a good desolubility without any problems and can maximize the packaging weight.

The tow packing method according to the present invention includes a tow of a swing chute through a carbon chro- matic precursor tow or a flame resistant fiber precursor tow that reciprocates in a direction perpendicular to the tow width direction and the tow supply direction. Reciprocating the packing container in the toe width direction while transferring into the packing container from the dispensing end, and simultaneously raising the swing chute relative to the packing container in accordance with the rise of the toe transfer surface; When the packing container reaches either end of the reciprocating movement, a step of pressing down the press plate located above the end opposite to the end and compressing the tow transferred into the packing container And have. When the total fineness of the tow is 48000 dtex or more and less than 180000 dtex, the distance a (mm) between the lowest position of the toe ejection end and the toe transfer surface during the reciprocating motion of the swing chute, and the thickness h ( mm) and the shortest distance y (mm) between the press plate and the swinging chute in the toe width direction when the press plate is pushed down, 10 ≦ a ≦ 400, and (a−h) / The relationship of y ≦ 3.3 (here, 30 mm ≦ h and 10 mm ≦ y) is satisfied.

When the total fineness of the tow is 180000 dtex or more and 720000 dtex or less, the relations 10 ≦ a ≦ 500 and (a−h) /y≦4.7 (where 30 mm ≦ h and 10 mm ≦ y) are satisfied. ing.

  The swing chute is raised relative to the packaging container, and the distance between the toe ejection end and the transfer surface is controlled within a certain range (10 ≦ a ≦ 400 or 10 ≦ a ≦ 500) according to the increase of the tow transfer surface. Therefore, it is possible to improve the toe transfer form. By improving the toe transfer form, it is possible to obtain good detackability without twisting or breaking of the tow when it is pulled out from the package. The distance a (mm) between the lowest position of the toe end and the toe transfer surface, the thickness h (mm) of the press plate, and the shortest distance y (mm) between the press plate and the swing chute in the toe width direction ) Is set to an appropriate value as described above, it is possible to avoid a decrease in followability of the tow to the swing chute due to the air flow generated when the press plate is lowered. Further, it is possible to prevent the tow from being caught on the upper part of the press plate due to the generation of the entrainment flow to the upper part of the press plate when the press plate descends. In addition, by controlling (a−h) / y as an index, the transfer form can be optimized and the relative positional relationship between the transfer part and the press part can be determined. Is possible.

  The pressing starts at an early stage of transfer, that is, a stage where the transfer surface is at the bottom of the packaging container. Pressing from an early stage leads to maximization of the storage bulk density, and also pressing down at the time of transfer leads to downsizing of the equipment. The press is performed at the folding position on both sides in the reciprocating movement of the packaging container. The fact that the packing container has reached the turn-back position can be detected by a phototube switch. Since the press plate needs to follow the transfer surface that gradually rises in the packing container, it is preferable to drive the press plate with an air cylinder. It is desirable to ensure a sufficient stroke length to perform pressing from an early stage of transfer, and it is desirable to make the expansion / contraction stroke longer than in the prior art.

  It is preferable that the distance between the toe ejection end and the toe transfer surface is set so that the tow is less susceptible to the influence of air resistance or the like. For example, when the total fineness of the tow is 180,000 dtex or more and 720000 dtex or less, the distance between the toe ejection end and the toe transfer surface is preferably 10 to 500 mm as described above, more preferably 100 to 300 mm, and still more preferably 100 to 200 mm. is there. If this distance is too long, the air resistance is likely to be affected, which causes defective transfer forms such as torsion.

  The press plate may have a reinforcing wall on the side surface. In this case, the height of the reinforcing wall determines the thickness h of the press plate. The reinforcing wall preferably has a trapezoidal shape that narrows in the height direction. By tilting the reinforcing wall, it is possible to prevent tow catching during pressing or when the press plate is raised when using an interior bag.

  It is desirable that the toe inlet of the swing chute has a wider receiving port. On the other hand, when the tow is transferred, it is necessary to prevent twisting in the swing chute and keep the tape-like flat state. Since the tow's own weight is small, it is easy to receive air resistance against the swing of the swing chute, and there is a possibility of false twisting in the swing chute. In order to prevent this, in the section from the bottom of the receiving port to the toe swing end, the inner dimension of the swing chute in the toe width direction is approximately 1.2 to 2.5 times the toe width, leaving a margin in the width direction. It is desirable to have Further, in order to keep the air flow in the swing chute uniform, it is desirable to make the inner space dimension in the toe width direction from the bottom of the receiving opening to the swing opening portion constant. The cross-sectional dimension of the swing chute in the swing direction is preferably set to approximately 30 to 100 mm.

  In order to supply the toe to the toe inlet of the swing chute, it is desirable to provide a pair of gear rolls above the swing chute. Specifically, it is preferable that the position of the gear roll is fixed, a tow introduction port of the swing chute is disposed directly below the meshing portion of the gear roll, and the swing chute is swung with the tow introduction port as a fulcrum. Since the tow is supplied to the tow introduction port while causing slipping, it is not necessary to strictly control the tension, and at the same time, the tow form can be stabilized. Further, by adopting such an arrangement of the gear roll and the swing chute, it becomes possible to accommodate the press plate in high density with the press plate. The gear roll has two cylinders with teeth facing each other at a predetermined interval, and the teeth facing each other in the axial direction of each cylinder are connected by a plurality of pipes or round bars, or squares with rounded corners. It is desirable to form. With this configuration, cost can be reduced and maintenance for wear and the like is facilitated.

  As described above, according to the present invention, the carbon fiber precursor tow and the flame resistant fiber precursor tow having a high fineness can be stably stored in the packing container in a good transfer form, and the tow is twisted when being pulled out from the package. It is possible to provide a packing method for a carbon fiber precursor tow or the like, which can obtain good detackability without breakage or the like and can maximize the packing weight.

  Hereinafter, the carbon fiber precursor tow and flame resistant fiber tow packing method of the present invention will be described together with a preferred embodiment of a packing device for carrying out the method with reference to the drawings.

  FIG. 1 is an overall schematic diagram of a carbon fiber precursor tow and flame resistant fiber tow packing apparatus used in a typical embodiment of the present invention.

  The toe transfer machine 10 includes a pair of gear rolls 11, a swing chute 12, a plate 13 that can be moved up and down, a container reciprocating drive conveyor 15 that reciprocates the packing container 14, and a pair of press devices 16. A toe introduction port 12 a of the swing chute 12 is positioned to face the gear roll 11 immediately below the toe feed position between the pair of gear rolls 11. The swing chute 12 is supported by the plate 13 so that the entire swing chute 12 can swing within one vertical plane around the vicinity of the toe inlet 12a at the upper end. The swing direction S of the swing chute 12 is a direction orthogonal to both the toe width direction R and the toe supply direction F. The plate 13 can be moved up and down by a ball screw jack 18 using a servo motor (not shown) as a driving device. A container reciprocating drive conveyor 15 is provided at the mounting position of the packing container 14 below the swing chute 12. The container reciprocating drive conveyor 15 reciprocates the packing container 14 in the toe width direction R. A pair of press devices 16 is provided above the folding position on both sides when the packing container 14 reciprocates.

  As shown in an enlarged view in FIG. 2, the pair of gear rolls 11 includes two disks 11 a having the same shape and arranged to face each other. A large number and the same number of gear teeth 11c are formed at equal intervals on the outer peripheral edges on both axial sides of each disk 11a. The tops of the opposing gear teeth 11c on both sides are connected by a pipe or a round bar 11b. The disks 11a are connected to each other by engaging the pipes or the round bars 11b. The pipe or round bar 11b is fixed to the disk 11a by exposing half of its cross section from the outer peripheral edge of the disk 11a to the outer peripheral side.

  With such a gear roll structure, it is possible to reduce the weight and reduce the material and gear manufacturing costs. If the pipe or round bar 11b is detachably attached to the disc 11a with bolts and nuts, even if some of the pipes or round bar 11b are damaged, they can be easily replaced and maintenance can be facilitated.

  The ball screw jacks 18 are provided on both ends of the plate 13 with respect to the swinging direction S. The four corners of the plate 13 are supported by guide shafts (not shown). On the plate 13, a drive device (for example, a servo motor) for the ball screw jack 18, a jig (not shown) for holding the swing chute 12, and a speed control device 19 for the swing chute 12 are provided. The plate 13 is raised and lowered by forward and reverse rotation of the ball screw, and the raising / lowering speed can be controlled by controlling the driving device.

  At the start of the transfer of the tow 1, the swing chute 12 is inserted to a predetermined position in the packing container 14. When the transfer of the tow 1 is started, the tow 1 passes through the inside of the swing chute 12 that reciprocates (swings) in the swing direction S, and enters the packing container 14 from the toe swinging end 12b of the swing chute. Transferred. The swing chute 12 rises as the toe transfer surface T (see FIG. 5) rises, and the distance a between the toe transfer surface T and the toe output end 12b is maintained at a predetermined value until the end of transfer. When the distance a exceeds a predetermined value, the tow 1 is easily affected by air resistance or the like, causing torsion or breakage of the tow 1, leading to deterioration of the transfer form and lowering of the looseness.

  In this embodiment, the swing chute 12 rises as the transfer surface T of the tow 1 rises. Conversely, the height position of the swing chute 12 is fixed, and the packing container 14 moves the transfer surface of the tow 1. The structure may be lowered as T rises. That is, the swing chute 12 may be configured to rise relative to the packaging container 14 in accordance with the rise of the transfer surface T of the tow 1. The drive system is not limited to the servo motor as long as the distance a between the toe ejection end 12b and the transfer surface T of the tow 1 is kept constant, and any mechanical method can be used.

  The swing chute 12 is formed of a rectangular cylinder that is manufactured by pressing a metal plate such as stainless steel, aluminum alloy, or copper alloy and welding the plate. As shown in FIG. 3, the opening cross section of the toe inlet 12a of the swing chute 12 is rectangular. The opening cross section of the toe swinging end 12b is a rectangle in which the inner space dimension in the swing direction S is narrowed to about ½ of the inner space dimension in the toe width direction R. In one example, the inner space dimension in the swing direction S (tow thickness direction) is about 170 mm at the toe introduction port 12a, but is reduced to about 50 mm at the toe outlet end 12b. On the other hand, the inner dimension in the toe width direction R is about 100 mm for both the toe inlet 12a and the toe outlet end 12b.

  Thus, since the inner dimension of the swing chute 12 is constant in the toe width direction R and only the inner dimension of the swing direction S is reduced, the tow 1 traveling inside the swing chute 12 is reduced. Twist can be prevented. As a result, the desired flat shape is maintained without twisting when the tow 1 is swung downward. Further, in the present embodiment, as shown in FIG. 1, in order to apply a pulling force in the swinging direction to the tow 1 traveling in the swing chute 12, the tow inlet 12 a of the swing chute 12 is connected to the inside of the swing chute 12. An air supply unit 12 ″ for generating an air flow toward the air is provided. Instead of the air supply unit 12 ″, an air curtain-like air flow is provided in the vicinity of the toe output end 12b of the swing chute 12 toward the output direction. An air supply unit for generating the air may be provided. The inner surface of the swing chute 12 is buffed so that the tow 1 does not get damaged due to friction when it passes through the swing chute 12.

  As shown in FIG. 1, the swing chute 12 includes a bracket 12 ′ on one side surface in the swing direction S. The lower half of the bracket 12 'is fixed to the swing chute 12 by welding or the like. The upper half of the bracket 12 'is coupled to the rotary shaft 17 in the vicinity of the center thereof. The rotary shaft 17 is rotationally driven by a drive source (not shown) via a swing mechanism (not shown) such as a cam. As a result, the swing chute 12 swings with a predetermined swing width with the axis of the rotary shaft 17 as the swing center. The swinging width of the toe swinging end 12b of the swinging chute 12 is substantially the same as the inner empty dimension in the swinging direction S of the packing container 14 disposed below. As the swing mechanism, a known mechanism such as a link mechanism can be used in addition to the cam. You may control the width | variety of a reciprocation directly with a servomotor. The flat tow 1 having a large fineness is fed downward through the gear roll 11 and introduced into the swing chute 12. Since the entire portion from the toe introduction port 12a of the swing chute 12 to the tip toe swing end 12b is swung in the same direction via the bracket 12 ', the flat tow 1 smoothly travels inside the swing chute 12. To do.

  In this embodiment, the rocking speed of the rocking chute 12 is set to be 0.75 to 1.25 times the spinning speed. For this reason, the tow 1 is not excessively or excessively ejected from the toe ejection end 12 b of the swing chute 12, and the tow 1 is reliably folded even at the folding position of the packaging container 14. As a result, the tow 1 can be reliably transferred to the end of the packing container 14 in the swing direction S and can be evenly stored on the entire surface of the packing container 14. At the same time, the number of turns of the tow 1 inside the packaging container 14 can be minimized, and as a result, the bulk density of the packaging can be maximized.

  As shown in FIG. 1, the container reciprocating drive conveyor 15 is composed of a roll conveyor in which a plurality of rotating rolls 15 a are arranged in the toe width direction R on the same horizontal plane. One of the plurality of rotary rolls 15a is a drive roll that is reciprocally rotated by a drive shaft (not shown). A chain wheel (not shown) is provided at the shaft end of the drive roll. The other rotary roll 15a is a driven roll having a chain wheel (not shown) at the shaft end. The driving roll and the driven roll are connected via a chain (not shown) and a chain wheel, and rotate in synchronization in the same direction. Two phototube type detectors 15c and 15c 'are provided on the support frame 15b that supports the rotating roll 15a. The phototube-type detector 15c detects that the packing container 14 moving on the container reciprocating drive conveyor 15 has reached a predetermined position (end of reciprocating motion). The detection signal is sent to a control unit (not shown), and the control unit receiving the signal inverts the drive shaft of the rotary roll 15a. When the photoelectric tube detector 15c ′ provided at the opposite position detects that the packing container 14 has reached a predetermined position (end of reciprocating motion), the packing container 14 is turned back again, and this movement is repeated thereafter. .

  The control unit can stop the packing container 14 for an arbitrary time by an external signal input from the time when the packing container 14 reaches a predetermined position to the start of folding. By transferring the tow 1 during the stop time at each turn-back position, it is possible to transfer the tow 1 with no gap to the end in the toe width direction R of the packaging container 14 in combination with the subsequent press operation, thereby improving the transfer state. be able to.

  The reciprocating speed of the packing container 14 is set to 1/100 to 1/16 of the spinning speed. By reciprocating the packing container 14 in the toe width direction R within this speed range, the tow 1 transferred to the packing container 14 is prevented from falling down obliquely, and uniform storage becomes possible.

  A pair of press devices 16 is provided above the position where the tow 1 is transferred from the swing chute 12 in the front-rear direction with respect to the toe width direction R, specifically, above each folding position in the reciprocating movement of the packing container 14. It has been. As shown in FIG. 4 in an enlarged manner, the press device 16 includes a single-stage cylinder 16a and a press plate 16b having a plate material 16c. The end of the cylinder 16a is fixed to the center of the press plate 16b. The cylinder 16a may be a multistage cylinder. The multistage cylinder is suitable for ensuring a required stroke length and making the entire length of the cylinder compact. In the present embodiment, pressing by the press plate 16b is performed from the initial stage of transferring the tow 1 even for the large packaging container 14, and the press plate 16b needs to follow the transfer surface T that gradually rises. For this reason, the expansion / contraction stroke of the cylinder 16a is made longer than usual. The packing container 14 reciprocates in the toe width direction R even when pressing by the press plate 16b is performed. In order to make the press plate 16 b follow the movement of the packaging container 14, it is preferable that the mounting portion of the press plate includes a hinge mechanism that can swing in the same direction (tow width direction R) as the reciprocating motion of the packaging container 14. . When the press plate 16 b swings, a return occurs when the press plate 16 b rises, and interference such as contact may occur with the swing chute 12. Therefore, it is preferable that the distance y (see FIG. 5) between the lowermost side surface of the press plate 16b and the one side surface of the swinging chute 12 facing the press plate 16b is 10 mm or more away in the toe width direction R.

  As shown in FIGS. 1 and 4, the press plate 16 b includes a metal plate 16 c that is similar to the shape of the bottom of the packaging container 14 and has substantially the same shape in the swing direction S. In order to ensure the strength and rigidity of the peripheral portion of the plate member 16c, a reinforcing wall 16b 'is provided at the peripheral portion with an inclination. In order to prevent fluff and the like from occurring when the tow 1 in the packaging container 14 is pressed, the lower surface of the plate material 16c and the outer surface of the reinforcing wall 16b 'are buffed.

  The height h of the reinforcing wall 16b ′ (see FIG. 5) is 30 mm or more in order to avoid the upper end of the reinforcing wall 16b ′ from being buried in the transferred tow 1 during the press at the time of transfer. Yes. If the reinforcing wall 16b 'is low, the reinforcing wall 16b' is buried in the tow 1 transferred during pressing, and when the press plate 16b rises, the tow 1 is hooked to disturb the transfer form and cause trouble of the apparatus. It becomes.

  When the tow 1 is transferred to the packaging container 14, the press is performed from the start of the transfer of the tow 1, and the transfer of the tow 1 continues in the other half of the packing container 14 simultaneously with the pressing. The press plate 16b presses the opposite half when the packaging container 14 reaches the turn-back position. The fact that the packing container 14 has reached the turn-back position is detected by the photoelectric tube detector 15c (or 15c ') as described above. When one press plate 16b is operated at the folding position of the packaging container 14, the other press plate 16b is in the upper standby position. At this time, the transfer of the tow 1 continues on the side of the press plate 16b waiting at the same time. Has been done.

  That is, in the tow packing method of this embodiment, the packing container 14 is reciprocated in the toe width direction R, and at the same time, the swing chute 12 is moved relative to the packing container 14 in accordance with the rise of the transfer surface T of the tow 1. When the packaging container 14 reaches either end of the reciprocating movement and the step of relatively raising, the press plate 16b positioned above the end opposite to the end is pushed down to 14 to compress the tow 1 transferred to the inside.

  The press plate 16b is made of a stainless porous plate. This is because when the press plate 16b descends and presses the tow 1, air escape is urged to prevent the yarn from being disturbed by wind pressure, and the air present between the filaments of the tow 1 to be pressed is removed. Because. The opening ratio of the press plate 16b is preferably 20 to 40%. The hole diameter is set to 5 to 15 mm so that the tow 1 does not enter. In this embodiment, a staggered arrangement having a hole diameter of 10 mm, a pitch of 17.5 mm, and an opening ratio of 30% is employed. The press surface is finished by buffing to prevent the tow 1 from being caught.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not restrict | limited by these Examples.

  Using the apparatus described above, the tow was transferred, and the press plate was pressed down to check whether there was a trouble with the tow being caught on the top of the press plate. In the following explanation, the distance between the lowest position of the tow transfer end of the swing chute and the transfer surface during the transfer to the packaging container and the press by the press plate is a, the thickness of the press plate ( The height of the reinforcing wall) is h, and the distance between the side surface of the swing chute in the toe width direction R and the lowermost side surface of the pressing plate facing the y is y. The distance a was set to a ≦ 400 mm or a ≦ 500 mm based on the transfer form of the tow and the total fineness of the tow. As described above, the height h is set to 30 mm ≦ h from the height at which the upper end of the press plate is not buried in the tow during pressing. As described above, the interval y is set to 10 mm ≦ y in order to avoid interference between the press plate and the swing chute. (a-h) / y is a parameter within the range satisfying the above conditions. The inner dimension (mm) of the packaging container was 720 × 720 × 1000 h. The presence or absence of a catching trouble was determined by whether or not a tow was caught on the top of the press plate when the press plate was lowered.

Example 1
A tow having a total fineness of 48000 dtex was transferred at a = 400, h = 30, (ah) /y=3.0. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Example 2)
A tow having a total fineness of 48000 dtex was transferred at a = 400, h = 30, (ah) /y=3.3. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Comparative Example 1)
A tow having a total fineness of 48000 dtex was transferred at a = 400, h = 30, (ah) /y=3.5. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Comparative Example 2)
A tow having a total fineness of 48000 dtex was transferred at a = 400, h = 30, (ah) /y=4.0. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Example 3)
A tow having a total fineness of 180000 dtex was transferred at a = 400, h = 30, (ah) /y=4.0. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

Example 4
A tow having a total fineness of 180000 dtex was transferred at a = 400, h = 30, (ah) /y=4.5. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Comparative Example 3)
A tow having a total fineness of 180000 dtex was transferred at a = 400, h = 30, (ah) /y=5.0. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Comparative Example 4)
A tow having a total fineness of 180000 dtex was transferred at a = 400, h = 30, (ah) /y=5.5. Table 1 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

  In Examples 1 to 4 and Comparative Examples 1 to 4, the swing chute speed ratio and the conveyor speed ratio are constant, a = 400, h = 30, and the total fineness of y and tow as parameters, (ah) The threshold for the presence / absence of / y is confirmed.

  From Table 1, it can be seen that, for each total fineness of tow, when (a-h) / y falls below a predetermined threshold, the tow is not caught on the upper part of the press plate, and smooth transfer can be performed.

  Compared to a case with a total fineness of 48000dtex, the case with a total fineness of 180,000dtex is more susceptible to the influence of entrainment flow during pressing and is more likely to flutter. From Table 1, when the total fineness is 48000dtex, the threshold value for the presence or absence of trouble is between (ah) /y=3.3-3.5 (the upper limit value actually confirmed is 3.3), while the total fineness is 180,000dtex ( ah) /y=4.5 to 5.0 (the upper limit value actually confirmed is 4.5) and the threshold value is large. This is because if the total fineness of the tow is increased, the weight of the tow becomes a direction in which the fluttering to the upper part of the press plate during pressing is suppressed. That is, if the threshold value of (a-h) / y is determined with the total fineness of a smaller tow, no trouble will occur at that threshold even if the total fineness of the tow is larger than that.

(Example 5)
A tow having a total fineness of 48000 dtex was transferred at y = 112, h = 30, (ah) /y=3.0. Table 2 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Example 6)
Tow with a total fineness of 48000dtex was transferred at y = 112, h = 30, (ah) /y=3.3. Table 2 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

(Comparative Example 5)
A tow having a total fineness of 48000 dtex was transferred at y = 112, h = 30, (ah) /y=3.5. Table 2 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of a tow catching trouble.

  In Examples 5 and 6 and Comparative Example 5, the threshold value for the presence or absence of trouble of (ah) / y was confirmed by fixing the values of y and h under the condition of a total fineness of 48000 dtex and changing a. .

  From Table 2, even when a was changed, the threshold value of (a-h) / y was between 3.3 and 3.5, and the same results as in Example 1 and Comparative Examples 1 and 2 in which y was changed were obtained. This is a total fineness of 48000dtex, which is most likely to be affected by the entrainment flow at the time of pressing, and in the case where the tow is easily caught on the upper part of the press plate. It shows that the threshold values of ah) / y are the same. Moreover, the increase of h means that the distance between the toe swinging end and the upper end of the reinforcing wall is narrowed, and the tow is hardly caught on the upper part of the press plate. Therefore, even if h is increased, if at least (a-h) / y is 3.3 or less, a tow catching trouble will not occur.

(Example 7)
A tow having a total fineness of 48000 dtex was transferred at y = 10, h = 30, (ah) /y=3.3. Table 3 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

(Example 8)
A tow having a total fineness of 48000 dtex was transferred at y = 10, h = 30, (ah) / y = 12. Table 3 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

(Comparative Example 6)
A tow having a total fineness of 48000 dtex was transferred at y = 10, h = 30, (ah) / y = 17. Table 3 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

(Comparative Example 7)
A tow having a total fineness of 48000 dtex was transferred at y = 10, h = 30, (ah) / y = 22. Table 3 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

  In Examples 7 and 8 and Comparative Examples 6 and 7, threshold values for the presence or absence of trouble in (ah) / y when y and h are set to the lowest limit values within the allowable range and a is changed are confirmed. .

  In the fifth embodiment, a, h, and y are minimum values, that is, the toe end, the toe transfer surface, and the reinforcing wall are closest to each other. In this case, the tows that are ejected from the toe ejection end are immediately stacked because the transfer surfaces are close to each other, and there is no trouble of catching on the upper portion of the press plate. Also, when the value of a is small, the tow flutters on the opposite side of the pressed plate due to the wind pressure generated during pressing, so the hook of the tow on the top of the pressed plate is (ah) / y = 17 It does not occur unless the value is too large.

  From the above, in the situation where the tow is affected by the entrainment flow at the time of pressing, and it is most likely to fly and catch trouble on the top of the press plate, the total fineness of the tow of the lower limit value of the specified range (ah) / y A threshold was set. If this threshold value was satisfied, it was shown that the trouble of catching on the upper part of the press plate did not occur and the transfer was made smoothly.

Example 9
A tow having a total fineness of 180000 dtex was transferred at a = 500, h = 30, (ah) /y=4.0. Table 4 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

(Example 10)
A tow having a total fineness of 180000 dtex was transferred at a = 500, h = 30, (ah) /y=4.5. Table 4 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

(Example 11)
A tow having a total fineness of 180000 dtex was transferred at a = 500, h = 30, (ah) /y=4.7. Table 4 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

(Comparative Example 8)
A tow having a total fineness of 180000 dtex was transferred at a = 500, h = 30, (ah) /y=5.0. Table 4 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

(Comparative Example 9)
A tow having a total fineness of 180000 dtex was transferred at a = 500, h = 30, (ah) /y=5.5. Table 4 shows the results of the swing chute speed ratio with respect to the spinning speed, the conveyor speed ratio, and the presence or absence of tow catching trouble.

  In Examples 9 to 11 and Comparative Examples 8 and 9, when the swing chute speed ratio and the conveyor speed ratio are the same, a = 500, h = 30, and the total fineness of 180000 dtex, (ah) / y This is a confirmation of the threshold for the presence or absence of trouble.

  From Table 4, tow catching on the upper part of the press plate does not occur at (a-h) /y=4.7 to 5.0. As shown in the case of the total fineness of 48000 dtex, if the threshold value at this time is satisfied, the trouble of catching on the upper part of the press plate does not occur and the transfer is smoothly performed.

  Next, a dissolvability test was conducted. FIG. 5 is a schematic diagram showing the state of the solubility test. The packaging container 14 was installed in a flat place, and the top guide 20 was installed at a position above the packaging container by a certain height so as to be parallel to the toe width direction. There is no interference in the path from the tow 1 being pulled out of the packaging container 14 to the top guide 20 where the tow 1 is contacted. After the transfer to the surface position of the packing container 14, the packing container 14 is divided into three parts, an upper part, a middle part, and a bottom part. At each position, the top guide 20 is pulled out at a constant speed for 2 hours. The number of tow 1 twists, inversions, etc., was counted. The total fineness of the tow used in the desolubility test is 180,000 dtex, the inner size (mm) of the packaging container is 720 x 720 x 1000 h, the height from the ground to the top guide is 7.2 m, and the withdrawal speed is 4.5 m / min did. Moreover, the conditions at the time of transfer were 0.9 times the swing chute speed ratio with respect to the spinning speed and 1/50 the conveyor speed ratio with respect to the spinning speed.

(Example 12)
Table 5 shows the results of the looseness test when a tow having a total fineness of 180000 dtex was transferred while keeping the distance between the toe end and the toe transfer surface at 140 mm.

(Comparative Example 10)
Table 5 shows the results of the desolubility test when a tow with a total fineness of 180000 dtex was transferred with the toe swinging end height position fixed 140 mm above the packing container.

  Table 5 shows that the tow transfer method and its structure are not limited, but as described above, the transfer method improves the dissolvability while maintaining the distance between the toe discharge end and the transfer surface. Yes.

  When the distance a between the toe ejection end and the transfer surface is maintained, the transfer form is uniform from the bottom to the top of the packaging container, whereas when the height position of the toe ejection end is fixed, Since the distance between the toe end and the transfer surface changes during transfer, the frequency of transfer is increased with twists or breaks toward the bottom of the packaging container that is highly susceptible to air resistance, etc. Significantly reduces toughness. In addition to the state at the time of transfer, the number of troubles tends to increase as it goes to the bottom of the packaging container because a clear crease is likely to occur due to the weight of the tow during storage.

It is a perspective view which shows an example of the packing apparatus applied to this embodiment. It is a perspective view which shows an example of the gear roll of the packaging apparatus shown in FIG. It is a perspective view which shows an example of the rocking | swiveling chute of the packaging apparatus shown in FIG. It is a perspective view which shows an example of the press apparatus of the packing apparatus shown in FIG. FIG. 5 is a conceptual cross-sectional view of the packaging device shown in FIG. It is a figure which shows the outline of the dissolution test used in the present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tow 10 Transfer machine 11 Gear roll 11a Gear disk 11b Pipe or round bar 12 Oscillating chute 12 'Bracket 12''Air supply part 12a Tow introduction port 12b Tow ejection end 13 Plate 14 Packing container 15 Container reciprocating drive conveyor 15a Rotation Roll 15b Support frame 15c Photoelectric tube detector 16 Press device 16a Cylinder 16b Press plate 16b 'Reinforcement wall

Claims (2)

The carbon fiber precursor tow or flame resistant fiber precursor tow is transferred into the packaging container from the toe outlet end of the swing chute through the inside of the swing chute that reciprocates in the direction perpendicular to the tow width direction and the tow supply direction. While reciprocating the packing container in the toe width direction, and simultaneously raising the swing chute relative to the packing container in accordance with the rise of the transfer surface of the tow;
When the packing container reaches one end of the reciprocating movement, the press plate located above the end opposite to the end is pushed down, and the tow transferred into the packing container is pressed. A step of compressing
Have
The total fineness of the tow is 48000 dtex or more and less than 180000 dtex,
The distance a (mm) between the lowest position of the toe ejection end and the transfer surface of the tow during the reciprocating motion of the swing chute, the thickness h (mm) of the press plate, and the press plate 10 ≦ a ≦ 400 and (a−h) / y ≦ 3. Between the shortest distance y (mm) between the press plate and the swinging chute in the toe width direction when pressed down. 3 (where 30 mm ≦ h and 10 mm ≦ y) is satisfied,
Tow packing method. The carbon fiber precursor tow or flame resistant fiber precursor tow is transferred into the packaging container from the toe outlet end of the swing chute through the inside of the swing chute that reciprocates in the direction perpendicular to the tow width direction and the tow supply direction. While reciprocating the packing container in the toe width direction, and simultaneously raising the swing chute relative to the packing container in accordance with the rise of the transfer surface of the tow;
When the packing container reaches one end of the reciprocating movement, the press plate located above the end opposite to the end is pushed down, and the tow transferred into the packing container is pressed. A step of compressing
Have
The total fineness of the tow is 180,000 dtex or more, 720000 dtex or less,
The distance a (mm) between the lowest position of the toe ejection end and the transfer surface of the tow during the reciprocating motion of the swing chute, the thickness h (mm) of the press plate, and the press plate 10 ≦ a ≦ 500 and (a−h) / y ≦ 4. Between the shortest distance y (mm) between the press plate and the swinging chute in the toe width direction when pressed down. 7 (where 30 mm ≦ h and 10 mm ≦ y) is satisfied,
Tow packing method.

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