JPH0556386U - Fiber bundle cutting device - Google Patents

Abstract

(57) [Abstract] [Purpose] To cut a fiber bundle made of a thermoplastic resin without causing heat fusion or disorder of the fiber bundle. [Structure] The fiber bundle F is cut by a gripping device 3 while pressing the fiber bundle F from the radial direction R on both sides of the cutting blade 1. The cutting blade 1 has a thin blade thickness t, a height H lower than a diameter D of the fiber bundle F, and a blade tip 11 formed in a tapered shape with a tapered tip.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a fiber bundle cutting device that cuts a fiber bundle made of a thermoplastic resin.

[0002]

[Prior Art]

 In fluid treatment devices such as water purifiers and industrial filters, short fiber bundles made by bundling a large number of hollow fibers made of thermoplastic resin are used as filtration modules. As one of the methods for obtaining the short fiber bundle, there is a method of cutting a long fiber bundle in which a large number of long fibers are bundled. When a saw blade is used for this kind of cutting, the saw blade cuts the fiber bundle and cuts it, so that fine fibers are caught and the cut surface of the short fiber bundle becomes extremely disordered. On the other hand, when a thick blade such as a brain knife or a microtome blade is used, the long fiber bundle is cut while being pushed away in the axial direction, so that the fiber bundle is easily disturbed or the cut surface is crushed.

[0003]

[Problems to be solved by the device]

 Therefore, the present inventor has tried to cut the long fiber bundle F using a circular cutting blade 50 having a smooth tapered blade edge surface 51 as shown in FIG. However, in this cutting method, as the cutting progresses, the side surface 52 of the circular cutting blade 50 comes into contact with the cutting surface of the long fiber bundle F over a large area. The cut surface of the fiber bundle F is fused, and as shown in the figure, the disorder of the fiber bundle at the cut portion C cannot be eliminated.

Further, since the diameter of the cutting blade 50 is much larger than the diameter of the long fiber bundle F, the blade thickness of the cutting blade 50 is accordingly increased. Therefore, since the above-mentioned long fiber bundle F is pushed back in the axial direction S by the blade thickness, the friction heat and the disturbance of the fiber bundle F increase.

The present invention has been made in view of the above conventional problems, and provides a fiber bundle cutting device capable of cutting a fiber bundle made of a thermoplastic resin without causing heat fusion or disorder of the fiber bundle. The purpose is to do.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the invention firstly proposes a band-shaped cutting blade, a driving device for driving the cutting blade in a direction orthogonal to the axial direction of the fiber bundle, and the fiber on both sides of the cutting blade. And a gripping device that presses the bundle in the radial direction. The cutting blade has a blade thickness of 0.8 mm or less, a height lower than the diameter of the fiber bundle, and a blade tip formed in a smooth tapered shape with a tapered tip.

[0007]

[Action]

 According to this invention, since the height of the cutting blade is low, the contact area between the cutting blade and the fiber bundle is small. In addition, since the blade thickness of the cutting blade is thin, the cutting blade pushes the fiber bundle axially to the extent that it cannot be retreated.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment. In FIG. 1, a long fiber bundle F is formed by bundling a large number of hollow fibers f made of a thermoplastic resin such as polysulfone into a columnar shape. In this figure, only the vicinity of the cut portion C is shown. ing. The long fiber bundles F are bundled with the tape T in advance on both sides of the cut portion C to maintain the shape.

The cutting blade 1 is in the form of a thin and long strip, and as shown in FIG. 2, the blade thickness t is set to, for example, 0.2 mm, and the cutting edge 11 has a tapered taper surface 1 with a tapered tip. Have two. The cutting edge 11 has a taper angle of about double at the tip 13. As shown in FIG. 3, the cutting blade 1 has a height H set lower than a diameter D of the long fiber bundle F. Mounting holes 15 are formed in both ends 14 of the cutting blade 1.

The cutting blade 1 is fixed to the U-shaped support frame 21 as shown in FIG. 1 through the mounting hole 15. A tension adjusting screw 23 is screwed onto one end 22 of the U-shaped support frame 21, and the screw 23 advances and retracts the mounting metal fitting 24 in the longitudinal direction of the cutting blade 1 so that the cutting blade 1 can be moved. Provides longitudinal tension. An attachment 25 is fixed to the upper part of the center of the support frame 21, and the support frame 21 is attached to a drive device (not shown) via the attachment 25. The drive device moves the cutting blade 1 back and forth in the direction R orthogonal to the axial direction S of the long fiber bundle F via the support frame 21 while lowering the cutting blade 1 downward.

A pair of gripping devices 3, 3 are provided on both sides of the cutting blade 1. Each gripping device 3 has a pair of gripping tools 31, 31 facing each other and an air cylinder 32 for moving the gripping tools 31, 31 forward and backward. Press down from the radial direction. It should be noted that the air cylinder 32 is shown only for one gripping device 3, and the other is omitted.

Next, a cutting method will be briefly described. First, the air cylinder 32 is extended, and the long fiber bundle F is pressed from both sides of the cut point C in the radial direction by the two pairs of grippers 31. Then, the drive unit (not shown) lowers the cutting blade 1 and reciprocates it in the direction of arrow R to cut the long fiber bundle F. When the cutting is completed, after the gripping by the gripping device 3 is released, the right section of the long fiber bundle F is carried out as a short fiber bundle, and after this carrying out, the long fiber bundle F is located on the right side in the axial direction S. The next cutting is performed by moving 1 pitch to. By repeating this operation, a large number of short fiber bundles are obtained from one long fiber bundle F.

In the above configuration, since the height H of the cutting blade 1 is smaller than the diameter D of the long fiber bundle F, the contact area between the cutting blade 1 and the long fiber bundle F during cutting is small. Moreover, since the thickness t (FIG. 2) of the cutting blade 1 is thin, when the cutting blade 1 enters the long fiber bundle F as shown in FIG. The hollow fibers f cannot be pushed away to the left or right (axial direction S). In this way, since the contact area with the long fiber bundle F is small and the long fiber bundle F cannot be pushed back in the axial direction S, the friction heat becomes small and the long fiber bundle made of the thermoplastic resin is reduced. The cut surface C1 of F is less likely to be fused and the disorder of the cut surface C1 is almost eliminated.

By the way, in the above embodiment, the blade thickness t in FIG. 3 is set to 0.2 mm, but the blade thickness t may be 0.8 mm or less. Further, the height H of the blade in FIG. 3 is generally preferably set to 20 mm or less. Further, in the above embodiment, the cutting blade 1 has an endless belt shape, but the cutting blade 1 may have an endless belt shape.

In the above embodiment, since the cutting blade 1 is fixed to the supporting frame 21 at both ends 14 of the cutting blade 1 in FIG. 1, the cutting blade 1 is stable, so that the cutting surface has a long fiber bundle. It tends to be perpendicular to the axial direction S of F. However, the cutting blade 1 does not necessarily have to be fixed at both ends 14. An example of this is shown in the second embodiment of FIG.

In FIG. 5, in this second embodiment, a long fiber bundle F is supported by a pair of gutters 33, and is pressed by a U-shaped yarn bundle presser 34 from above to make a long fiber bundle F. The fiber bundle F is pressed from the radial direction. The cutting blade 1 is connected to the crank 41 of the drive device 4 at one end portion 14 and is guided by the guide tool 6. The guide tool 6 has a thin groove 61 through which the cutting blade 1 can reciprocate. The gutter 33 rises during cutting. Other configurations are similar to those of the first embodiment, and the same portions or corresponding portions are designated by the same reference numerals and the description thereof will be omitted.

In each of the above embodiments, the fiber bundle in which hollow fibers are bundled has been described, but it goes without saying that the present invention is also applied to a fiber bundle in which solid fibers are bundled.

[0018]

As described above, according to the present invention, since the fiber bundle is cut by the cutting blade having the smooth tapered blade tip, the cutting surface is not cut by the saw blade, so that the cut surface is messy. do not become. In particular, since the blade thickness of the cutting blade is thin and its height is low, the contact area with the fiber bundle is small and the fiber bundle cannot be pushed back in the axial direction. The cut surface of the fiber bundle made of a thermoplastic resin is less likely to be fused, and the cut surface is hardly disturbed.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a cutting device showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a cutting edge.

FIG. 3 is a front view of a cutting blade.

FIG. 4 is a front view showing a state of a long fiber bundle being cut.

FIG. 5 is a schematic perspective view of a cutting device showing a second embodiment.

FIG. 6 is a schematic perspective view of a cutting device showing a conventional example.

[Explanation of symbols]

1 ... Cutting blade, 3 ... Gripping device, 4 ... Driving device, 11 ... Blade edge, D ... Diameter, F ... Fiber bundle, H ... Height, R ... Radial direction, S
... axial direction, t ... blade thickness.

Claims (1)

[Scope of utility model registration request] 1. A fiber bundle cutting device for cutting a fiber bundle made of a thermoplastic resin, comprising: a band-shaped cutting blade; and a drive device for driving the cutting blade in a direction orthogonal to an axial direction of the fiber bundle. A gripping device that presses the fiber bundle from both sides of the cutting blade from the radial direction is provided, and the cutting blade has a blade thickness of 0.8 mm or less, a height lower than the diameter of the fiber bundle, and a cutting edge. A device for cutting a fiber bundle that is formed into a smooth tapered taper.