JP2003268634A - Roller cutter type fiber bundle-cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller cutter type fiber bundle-cutting device, cutting a fiber bundle in a good efficiency and in an equivalent length by a simple structure, enabling the prevention of clogging of short fibers between adjacent cutters and/or between adjacent cutter blade stays and cutting the fiber twice, and discharging cut short fibers smoothly. <P>SOLUTION: This roller cutter type fiber bundle-cutting device is provided by supporting a plurality of cutters 23 with cutter rollers 20 by fixing and installing the cutters by taking a prescribed pitch P in the circumferential direction of the rollers without protruding cutter blade stays 22 to the side surface in the pitch direction of the cutters 23. By winding the fiber bundle 1 on the cutter roller 20 and compressing the fiber bundle 1 with a compressing roller 30, the fiber bundle is cut at a prescribed length continuously by the cutters 23 at the same time. In order to discharge the cut short fibers easily, it is necessary that the thickness A of the cutter blade stay 22 and the thickness B of the cutter 23 satisfy the relationship of A≤B. In order to reduce discharging resistance, it is desirable that the thickness A of the cutter blade stay 22 is less than the thickness B of the cutter 23. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller cutter type fiber bundle cutting device for continuously cutting a fiber bundle wound around a cutter roller into a predetermined length while pressing the fiber bundle,
In particular, it relates to a roller cutter type fiber bundle cutting device capable of efficiently and uniformly cutting a fiber bundle and smoothly discharging the fiber bundle.

[0002]

2. Description of the Related Art Conventionally, when manufacturing short fibers (staples) of synthetic fibers, a plurality of cutters are wound around a cutter roller fixed at a required pitch in the circumferential direction of the roller, and a fiber bundle is wound around the cutter roller. A roller cutter type fiber bundle cutting device that continuously cuts a bundle to a predetermined length while pressing the bundle is widely used.

In order to cut a fiber bundle using such a fiber bundle cutting device, the outer peripheral surface of the fiber bundle wound around the cutter roller two to three times is pressed by the pressing roller while the peripheral surface of the cutter roller is predetermined. Cut with a cutter that is arranged with a pitch and that rotates in one direction with the carter roller. At this time, the inside of the fiber bundle is pressed against the cutter, so that the fiber bundle is continuously cut into short fibers having a required length. The cut length of the short fibers at this time is determined by the pitch between the cutters fixed in parallel in the roller circumferential direction.

By the way, according to such a fiber bundle cutting method, since the pressing force of the pressing roller against the rotating cutter is extremely large, the cutter is likely to be deformed or broken. For this reason, in the conventional fiber bundle cutting device, the cutter blade stays are arranged so as to sandwich and support the front and rear surfaces in the rotation direction of the cutter, and the cutter blade stays are fixed to the cutter roller together with the cutter, so that the rigidity of the cutter body is improved. Also, the strength is ensured, and the structure is configured to withstand a large pressing force applied to the cutter when the fiber bundle is cut, thereby improving productivity.

However, since the cutters are sandwiched and supported by the cutter blade stays, the pitch between the adjacent cutter blade stays is inevitably narrower than the pitch between the adjacent cutters. As a result, for example, when a fiber bundle having a crimp is cut into short fibers, the short fibers are not discharged smoothly between the adjacent cutter blade stays, and not only between the adjacent cutter blade stays but also between the adjacent cutter blade stays. Since short fibers are also clogged between the cutters, there is a problem that efficient and stable cutting cannot be performed. In addition, short fibers clogged between adjacent cutters and / or between adjacent cutter blade stays are often cut again into powder between adjacent cutters and cutter blade stays, and are usually “double cut”. There was also a problem that this phenomenon occurred.

Many techniques have been proposed in order to solve such problems. As an example of this type of roller cutter type fiber bundle cutting device, for example, Japanese Patent Laid-Open No. 10-168670 discloses a roller cutter type fiber bundle cutting device for producing short fibers of 32 mm or less. The roller cutter type fiber bundle cutting device disclosed in the publication has a length of 32 m.
When producing short fibers of m or less, the ratio of the cut length X (mm) of the short fibers to the thickness Y (mm) of the cutter blade stay is defined as 6.6 ≦ X / Y ≦ 7.1. A funnel-shaped short fiber discharge auxiliary member forming an angle of 30 to 45 degrees is provided at a position within 2/3 of the distance from the center of the cutter roller to the outer circumference.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The roller-cutter type fiber bundle cutting device disclosed in Japanese Patent No. 8670, when manufacturing short fibers having a length of 32 mm or less as described above, has a ratio of the cut length of the short fibers to the thickness of the cutter blade stay, and further assists short fiber discharge. It is necessary to design so that the installation position and angle of the member are satisfied within a predetermined range.
Although the technology disclosed in the above publication may be effective within the limited range as described above, 32
Only short fibers of mm or less can be produced. Moreover, when manufacturing short fibers of 32 mm or less, the ratio of the cut length of the short fibers to the thickness of the cutter blade stay, and the installation position and angle of the short fiber discharge assisting member must be strictly set. Therefore, not only the design of the cutter, the cutter blade stay, the short fiber discharge assisting member, etc. tends to be complicated, but also the degree of freedom in the design becomes extremely small.

Further, in the above-mentioned conventional technique, as shown in FIG. 2 disclosed in the above-mentioned publication, a plurality of cutters are sandwiched by cutter blade stays and fixed to the cutter roller together with the stays. Since the pitch between adjacent cutter blade stays is inevitably narrower than the pitch between adjacent cutters, discharge resistance between adjacent cutter blade stays is required when manufacturing short fibers with extremely short cut lengths. Inevitably, the larger the number of short fibers produced, the more likely it is that short fibers will be clogged or double cut between adjacent cutters and / or adjacent cutter blade stays. Become.

Furthermore, the conventional carter blade stay of this type has a substantially U-shaped cross section as described in the above publication, and is closely fixed to the front and rear surfaces and the bottom surface of the cutter blade in the roller circumferential direction. is doing. Therefore, not only is its structure complicated, but high processing accuracy is required, which greatly affects the workability of manufacturing and assembling.

The present invention has been made to solve the above-mentioned conventional problems, and a specific object thereof is to cut a fiber bundle efficiently and in equal length with a simple structure, and to cut the adjacent cutters. Roller cutter type fiber bundle that enables to prevent clogging of short fibers and double cutting between adjacent cutter blade stays, and to smoothly discharge the cut short fibers It is to provide a cutting device.

[0011]

SUMMARY OF THE INVENTION The inventors of the present invention have taken into consideration the phenomenon that the cutter is deformed or damaged due to an excessive pressing force applied to the cutter when the fiber bundle is cut as described above. As a result of intensive studies to solve the above problems, when manufacturing short fibers of a certain specific length, surprisingly, the cutter was fixed to the cutter roller via a cutter blade stay that sandwiches and supports the cutter from three sides. We have found that even if the cutter mounting structure to be installed is eliminated, there is no deformation or damage to the cutter, and productivity can be improved.

That is, in the fiber bundle cutting of the roller cutter type, the cutter blades can be juxtaposed to the peripheral surface of the cutter roller without supporting the cutter blades from both front and rear sides by the cutter blade stays, and the adjacent cutters can be installed. Since the pitch therebetween is widened by the pitch difference between the adjacent cutter blade stays, the discharge resistance of the short fibers is reduced, and the clogging of the short fibers and the double-cutting phenomenon are prevented.

In the invention according to claim 1, a plurality of strip-shaped cutters are fixedly mounted at a required pitch in the roller circumferential direction via cutter blade stays, and are parallel to the rotation axis of the cutter rollers. And a pressing roller arranged to face the cutter roller to press the fiber bundle wound around the cutter roller, and the thickness A of the cutter blade stay is equal to the thickness B of the cutter. In the roller cutter type fiber bundle cutting device, the cutter blade stay is not thicker and supports the bottom surface of the cutter without protruding to the side surface in the pitch direction of the cutter.

The basic roller cutter type fiber bundle cutting device of the present invention has cutter blade stays arranged on the bottom surfaces of a plurality of cutter blades, and is fixedly installed together with the cutter blade stays at a predetermined pitch in the circumferential direction of the roller. ing. In order to cut a long fiber bundle into short fibers, the roller is driven and rotated while the fiber bundle is wound around the cutter blade a few times. At this time, the fiber bundle composed of a plurality of layers is simultaneously pressed by a pressing roller to sequentially cut the long fiber bundle from the lowermost layer into short fibers.

In the roller cutter type fiber bundle cutting device of the present invention, the cutter blade stays are arranged on the bottom surface of the cutter without protruding from the front and rear side surfaces of the cutter in the pitch direction, and are fixed with a required pitch in the roller circumferential direction. The simple structure of supporting the cutter from the bottom surface by adopting it is adopted. In this case, it is preferable to satisfy a specific relational expression between the length in the longitudinal direction of the cutter and the thickness in the circumferential direction of the cutter roller. As long as this relational expression is satisfied, even with the above-described structure, the pressing force of the pressing roller can be sufficiently endured, and the cutter will not be deformed or damaged.

To smoothly discharge the cut short fibers,
It is essential that the thickness A of the cutter blade stay in the roller circumferential direction and the thickness B of the cutter satisfy the relationship of A ≦ B. In order to reduce the discharge resistance between the adjacent cutter blade stays and / or between the adjacent cutters, it is more preferable that the thickness A of the cutter blade stays <the thickness B of the cutters.

According to the above construction, the pitch between the adjacent cutter blade stays is wider than the pitch between the adjacent cutters, so that the discharge of the cut short fibers is expanded from the discharge space between the cutters. The discharge space between the cutter blade stays is smoothly performed, and the short fibers are efficiently and equally cut without clogging between adjacent cutters and / or between the cutter blade stays. Will be able to. In addition, since the short fibers are smoothly discharged, the short fibers do not remain at the cutting edge of the cutter blade, and therefore, the double cutting does not occur naturally.

Therefore, according to the present invention, even if a large amount of tow is processed, the short fibers are smoothly discharged, and the cutter and the cutter blade stay cannot withstand an excessive pressing force and are deformed or damaged. Without doing so, it becomes possible to stably manufacture short fibers having a desired fiber cut length.

According to a second aspect of the present invention, the thickness A of the cutter blade stay and the thickness B of the cutter are 0.5 to 2.0 m.
It is characterized by being m. In order to remarkably bring out the action and effect of the first aspect, it is important to select the thickness A of the cutter blade stay and the thickness B of the cutter. It is effective that both the thickness A of the cutter blade stay and the thickness B of the cutter are 0.5 to 2.0 mm. If the thickness B of the cutter blade stay A and the cutter is less than 0.5 mm, an extremely large pressing force is likely to be concentrated on each of the cutter blade stays and the cutter, resulting in deformation of the cutter blade stays and cutters and blade spillage of the cutters. It becomes easier and is not suitable for implementation.

If the thicknesses A and B of the cutter blade stay and the cutter are larger than 2.0 mm, the pitch between adjacent cutters becomes narrow, and for example, short fibers having a cut length of 55 mm or less are cut. In this case, the short fibers are not discharged smoothly and the space between the adjacent cutter blade stays,
And / or clogging between the cutters makes it impossible to cut efficiently and to the same length, and the initial object of the present invention is not achieved.

According to a third aspect of the present invention, the above relational expression of the cutter is specified. The effective length L of the cutter in the longitudinal direction and the thickness B of the cutter in the circumferential direction of the cutter roller are specified.
Satisfies the formula (L / 100) <B <(L / 10).

Here, the effective length L in the longitudinal direction of the cutter means the cutter length of the portion exposed between the pair of flange portions of the cutter roller. In order to secure the strength of the cutter that can endure the cutting of the fiber bundle, the effective length L of the cutter in the longitudinal direction and the thickness B of the cutter in the cutter roller circumferential direction are set.
It is preferable to define and in a dimensional relationship of (L / 100) <B <(L / 10).

The thickness B of the cutter is 0.5 to 2.0 mm, and the expression (L / 100) <B <(L / 10) is satisfied with respect to the thickness B of the cutter. The length L of the cutter is 5mm <L <200mm within the range
It is preferable to set to. More preferably, (L / 7
5) The range of <B <(L / 25) is particularly effective. If the length L of the cutter is smaller than 5 mm, the diameter of the collar portion of the cutter roller becomes large, and the cutting ability of the cutter is extremely reduced, which is not preferable. If the length L of the cutter is larger than 200 mm, the rigidity and strength of the rotating cutter may be reduced, and the cutter may be easily deformed or the blade may be spilled.

According to the above construction, it is not necessary to sandwich and support the three sides of the cutter via the U-shaped cutter blade stay as in the conventional case. By supporting the bottom surface of the cutter as described above, it becomes possible to withstand a large local pressing force applied to the cutter when the fiber bundle is cut, and the productivity can be improved with a simple structure.

The invention according to claim 4 is characterized in that the pitch of the cutters is 10 to 100 mm. The pitch between the cutters that determines the cut length of the short fibers is not particularly limited, but it is desirable to define the range of the pitch between the adjacent cutters. The range of this pitch is preferably 10 to 100 mm, particularly 20 to 4 in order to bring out the above-mentioned effects remarkably.
It is preferably 5 mm. Even when an excessive concentrated load is applied to the cutter during cutting, the fiber bundle can be accurately cut into a length equal to the pitch between adjacent cutters without causing deformation or destruction of the cutter, It becomes possible to satisfactorily discharge the cut short fibers. If the pitch is smaller than 10 mm, the short fibers may not be discharged smoothly. If the pitch exceeds 100 mm, the pressing force of the pressing roller against the rotating cutter increases the component force toward the front and rear side surfaces in the rotating direction of the cutter. , The cutter may be deformed or destroyed.

In the invention according to claim 5, the cutter is
The base portion and the taper portion that gradually shrinks from the base portion toward the tip, and the taper angle of the taper portion is 10 to 4
It is characterized by being 0 °. The shape of the tapered portion of the cutter is not particularly limited as long as the blade does not spill and the short fibers can be discharged smoothly. In order to bring out the above-mentioned effects more remarkably, it is effective that the taper angle of the taper portion of the cutter is 10 to 40 °. In particular, the taper angle is preferably 14 to 31 °. Good cutting performance can be maintained for a long period of time by eliminating damage to the cutter blade.

According to a sixth aspect of the present invention, the taper portion has different taper angles on the tip side and the base body side.
It is characterized in that the taper angle on the side of the base body is more acute than that on the tip side. The taper portion of the cutter may have a single taper surface structure as in claim 5, but by forming the taper angle at the tip end side of the taper portion and the base body portion side in two steps , It is particularly effective to bring out the above-mentioned effects remarkably. By forming the taper angle on the base portion side of the taper portion to be more acute than the taper angle on the tip side, it is difficult for the blade of the cutter to spill,
The cut short fibers can be discharged more easily.

According to a seventh aspect of the present invention, the overall height of the tapered portion is 2.0 to 6.0 mm, the overall height of the cutter is 20 mm or less, and the height of the tapered portion is less than 20 mm. It is characterized by being more than the size. The overall height of the tapered portion is not particularly limited as long as it has a strength capable of withstanding cutting and is capable of smoothly discharging short fibers. The overall height of the tapered portion is preferably 2.0 to 6.0 mm, and more preferably the overall height of the tapered portion is 2.5 to 5.
It is effective that the thickness is 5 mm, and the above-mentioned effects can be achieved more remarkably.

According to an eighth aspect of the present invention, the taper surface on the tip side of the taper portion has an Rz value of 0.1 representing the surface roughness.
It is characterized in that the taper surface on the side of the base portion has an Rz value representing surface roughness of 0.8 to 25.0 μm.

The surface roughness of each of the tapered portions on the tip side and the base portion side in a cutter formed of two tapered surfaces having different angles is not particularly limited, but a commonly used stylus type surface roughness is used. Surface roughness Rz value of the taper surface on the tip side of the taper portion is preferably 0.1 to 6.3 μm, and more preferably 0.5 to 1.6 μm. Is particularly effective. The surface roughness Rz value of the tapered surface on the one base side is
The surface roughness may be the same as the surface roughness Rz value of the tapered surface on the tip end side, but it is preferably 0.8 to 25.0 μm. More preferably, 3.2 to 12.5 μm is desirable.

Due to such surface roughness, it becomes possible to prevent the short fibers from adhering to the surface of the cutter, and the short fibers can be discharged more smoothly.
It also provides high strength and strong toughness, giving the cutter a high quality surface.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a structural explanatory view schematically showing an example of a roller cutter type fiber bundle cutting device which is a typical embodiment of the present invention, and FIG. 2 is I of FIG.
4 is an enlarged cross-sectional view taken along the line I-II, FIG. 3 is an explanatory view showing the relationship between the thickness of the cutter blade stay and the thickness of the cutter applied to the roller cutter type fiber bundle cutting device of the present invention, and FIG.
FIG. 3 is an explanatory diagram showing a relationship between a cutter length and a cutter thickness applied to the roller cutter type fiber bundle cutting device of the present invention.

A roller cutter type fiber bundle cutting device 10 according to FIG. 1 includes a cutter roller 20 rotatably supported around a vertical axis and a cutter axis on a rotation axis parallel to the rotation axis of the cutter roller 20. The pressing roller 30 is made of an elastic material such as rubber and is rotatably supported so as to face the roller 20. According to the illustrated example, the guide roller 40 is rotatably supported on the rotation axis parallel to the rotation axis of the pressing roller 30 with the cutter roller 20 interposed therebetween.

The guide roller 40 is not limited to a roller having an axis of rotation parallel to the axes of rotation of the cutter roller 20 and the pressing roller 30 as shown in the figure, and may be, for example, the axis of rotation of the cutter roller 20. A roller having intersecting rotation axes and capable of guiding the fiber bundle by twisting obliquely may be used. Further, instead of the guide roller 40, a guide member such as a guide bar or a nip roller, or various kinds of guide members in combination thereof can be used.

The cutter roller 20 is shown in FIGS.
As shown in FIG. 3, it has a pair of upper and lower disc-shaped flange portions 21 and 21 facing each other at a required interval. Each collar 21
Between them, a cutter 23 made of a long member having a sharp tip with a sharp tip is fixedly provided via a cutter blade stay 22 arranged at a required pitch in the roller circumferential direction. As shown in FIG. 3, the cutter 23 is composed of a base portion 23a in the form of a long plate and a taper portion 23b that gradually shrinks from the base portion 23a toward the tip.

The feature of the present invention is that the thickness A of the cutter blade stay 22 of the cutter roller 20 is as shown in FIG.
Is set so as not to be thicker than the thickness B of the cutter 23, and the cutter blade stay 22 supports the bottom surface of the cutter 23 without protruding to the side surface of the cutter 23 in the pitch direction. . If the cutter blade stay 22 is configured to protrude from the cutter 23, the discharge of the cut short fibers will be hindered, and the initial object of the present invention cannot be achieved.

According to the illustrated example, a pair of upper and lower flanges 21 are provided.
The cutter blade mounting plates 24, 24
Is provided. A plurality of cutter mounting slits 24a, ..., 24a are formed on the facing surface side of each cutter blade mounting plate 24 with a required pitch in the roller circumferential direction about the rotation axis of the cutter roller 20. The both ends in the longitudinal direction of the cutter 23 are fitted and fixed to the pair of upper and lower slits 24a facing each other. On the bottom surface of the base portion 23a of the cutter 23, a cutter blade stay 22 is arranged which is sandwiched and fixed between the facing surfaces of the cutter blade mounting plates 24. Note that the attachment of the cutter blade stay 22 is not limited to the illustrated example, and like the attachment of the cutter roller 20, both longitudinal end portions of the cutter blade stay 22 are attached to the cutter blade attachment plate 24. It can be fitted and fixed in the formed mounting hole (not shown).

In the central portion of the cutter blade mounting plate 24 in the lower collar portion 21, a first taper for discharging short fibers having a taper surface adjacent to the bottom surface of the cutter blade stay 22 and having a diameter gradually reduced downward. The opening 24b is formed. The lower flange 21 is formed with a second opening 21a for discharging short fibers having the same inner diameter as the small-diameter tapered surface of the first opening 24b. In the lower collar portion 21,
In order to discharge the short fibers discharged through the second opening 21a downward, a short fiber discharging portion 25 made of a tubular member having a hollow inside is fixedly provided.

A horizontal space formed between the cutters 23 adjacent to each other with a required pitch in the roller circumferential direction of the cutter roller 20, the adjacent cutter blade stay 2
2, a space in the horizontal direction formed to be larger than the space between the cutters 23 adjacent to each other, the lower flange portion 21.
And the vertical openings 24b, 21a formed in the cutter blade mounting plate 24, and the vertical cavities formed in the short fiber discharge part 25 to have an inner diameter larger than the openings 24b, 21a. , Short-fiber discharge spaces for discharging short fibers cut into a length equal to the pitch P between the adjacent cutters 23 to a short-fiber conveying means 26 such as a belt conveyor.

The above configuration is an example of the roller cutter type fiber bundle cutting device 10 of the present embodiment, and the structure, shape, and constituent members thereof are not limited to the illustrated examples. Of course. In addition, although the said embodiment shows the structural example which the said cutter roller 20 horizontally rotates about a vertical axis line, this invention is not limited to an example of illustration, and the said cutter roller 20 can be rotated around a horizontal axis line. It can also be rotatably supported.

In this case, as described in the above-mentioned conventional publication, the cutter blade mounting plate 24 of the upper collar portion 21 is roller-rotated at the base end portion of the short fiber discharging member having a substantially trapezoidal shape. The short fiber discharge member, which is supported and fixed in a cantilever state around the axis, and whose diameter gradually decreases toward the lower flange portion 21 of the short fiber discharge member, is discharged through the openings 24b and 21a. You may face in the part 25. The short fiber discharge member may be, for example, a trumpet shape, a conical shape, a pyramid shape, or a groove long in the short fiber discharge direction may be formed in multiple stages in the roller circumferential direction of the short fiber discharge member as in the above-described conventional art. Various shapes such as various spline shapes can be effectively used.

The roller cutter type fiber bundle cutting device 10
In order to produce short fibers by using, the fiber bundle 1 is wound around the cutter roller 20 several times. Same cutter roller 2
The outer peripheral surface of the fiber bundle 1 composed of a plurality of layers wound around 0 is pressed by the pressing roller 30, and at the same time, the plurality of layers of the fiber bundle 1 are pressed at a right angle by the cutter 23 on the peripheral surface of the cutter roller which rotates in one direction. At the same time, the fiber bundle is continuously cut from the lowermost layer into short fibers having a length equal to the pitch P of the cutter 23. The short fibers cut to the required cut length are inserted between the adjacent cutter blade stays 22 and cutters 23 in the respective openings 24b and 21a of the collar portion 21 and the cutter blade mounting plate 24 and the short fiber discharge portion 25. Through the hollow portion, the short fiber conveying means 26 is slid down and dropped, and is conveyed by the short fiber conveying means 26 to a predetermined storage location.

By adopting the above structure, the discharge of the cut short fibers is smoothly performed from the discharge space between the cutters 23 to the discharge space between the enlarged cutter blade stays 22. Become. It is possible to prevent double cutting because short fibers are not caught and accumulated at the cutting edge of the cutter 23 without causing clogging of short fibers between the adjacent cutters 23 and / or between the cutter blade stays 22. In addition to being able to perform, it is possible to efficiently and equally cut. Even if a large amount of the fiber bundle 1 is cut, the cutter 23 and the cutter blade stay 22 endure the excessive pressing force concentratedly and the short fibers are discharged smoothly. It is possible to prevent the deformation and damage of the fiber and to stably produce the short fiber.

In the present invention, in addition to the positions of the cutter 23 and the cutter blade stay 22 as described above, the respective thicknesses of the cutter 23 and the cutter blade stay 22, the pitch P of the cutter 23, and the taper portion 23b of the cutter 23.
By appropriately setting the taper angle, the shape, the height, the length, the surface roughness and the material of the cutter 23, and the height and the material of the cutter blade stay 22, the above effects can be more remarkably exhibited. be able to. Therefore, the following explanation
The cutter 23 and the cutter blade stay 22 will be mainly described.

(1) Thickness B of Cutter 23 and Thickness A of Cutter Blade Stay 22 According to the illustrated example, the thickness A of the cutter blade stay 22 and the thickness B of the cutter 23 are set in order to facilitate discharge of short fibers. Has a relationship of A ≦ B. When the thickness A of the cutter blade stay 22 is larger than the thickness B of the cutter 23, the pitch of the adjacent cutter blade stays 22 becomes narrower and the discharge resistance of the short fibers increases, so that the short fibers cannot be discharged smoothly. Clogging occurs between the cutter blade stays 22 and efficient cutting cannot be performed.

In order to reduce the discharge resistance between the cutter blade stays 22, the thickness A of the cutter blade stays 22 and the thickness B of the cutters 23 are preferably A <B, and the thickness B of the cutters 23. Is 0.5 to 2.0 mm
Is desirable. If the thickness B is less than 0.5 mm, an excessive pressing force is likely to be concentrated and applied to the cutter 23, so that the cutter 23 is likely to be deformed and the blade spills.

If the thickness B is larger than 2.0 mm, the pitch P between the adjacent cutters 23 becomes narrow,
When cutting short fibers, particularly short fibers having a cut length of 55 mm or less, short fibers are not discharged smoothly, clogging occurs between adjacent cutters 23, and efficient and equal length cutting is not possible. .

On the other hand, the thickness A of the cutter blade stay 22
Is 0.5 to 2.0 in the same manner as the thickness B of the cutter 23.
It is preferably mm. This thickness A is 0.5-2.
If it exceeds the range of 0 mm, like the cutter 23, the cutter blade stay 22 is likely to be deformed or damaged, and the short fibers are not discharged smoothly.
Since the cutter blade stays 22 adjacent to each other are clogged, the cutter blade stays 22 cannot be efficiently cut into equal lengths.

(2) Pitch P of Cutter 23 The pitch P of the cutter 23 is equal to the cut length of the short fiber. The pitch P of the cutter 23 that determines the short fiber cut length
Is not particularly limited, but is preferably 10 to 100 mm, and more preferably 20 to 45 mm. It is possible to prevent the cutter 23 and the cutter blade stay 22 from being deformed or damaged due to an excessive pressing force applied to the cutter 23 at the time of cutting, and cut the short fiber into a length equal to the pitch P between the adjacent cutters 23. Can be satisfactorily discharged.

If the pitch of the cutter 23 is smaller than 10 mm, the short fibers may not be discharged smoothly. If the pitch exceeds 100 mm, the pressing force of the pressing roller 30 against the rotating cutter 23 causes the cutter 23 to rotate. The component force toward the front and back side of the direction increases, and the cutter 23
Deformation or damage may occur.

(3) Tapered portion 2 of cutter 23
Taper angle of 3b The shape of the cutter 23 is not particularly limited as long as blade spillage does not occur and short fibers can be discharged smoothly. The taper angle of the taper part 23b of the cutter 23 according to FIG. 3 is preferably 10-40 °, and more preferably, the taper angle of the taper part 23b is 14-31 °. If this range is satisfied, the cutter blade can be prevented from being deformed or damaged, and good cutting performance can be maintained for a long period of time.

(4) Shape of Cutter 23 The shape of the taper portion 23b in the cutter 23 shown in FIG. 3 is not limited to the example shown in the drawing. For example, the taper portion 23b may have a taper angle between the tip side and the base body side. It can be configured differently to have two stages. In this case,
It is preferable that the taper angle on the base side is more acute than the taper angle on the tip side. By making the taper portion on the base portion side more acute than the taper portion on the tip side, the blade is less likely to spill out, the cuttability is improved, and the short fibers can be discharged more easily.

(5) Height of Cutter 23 The total height of the tapered portion 23b of the cutter 23 shown in FIG. 3 is not particularly limited, but is 2.0 to
It is preferably 6.0 mm, and particularly 2.5 to 5.5.
More preferably, it is mm. The height of the cutter 23 as a whole is not particularly limited, but
It is preferably 8 to 20 mm or less, and more preferably 10 to 15 mm, because it has a strength that can withstand cutting and allows short fibers to be discharged smoothly.

(6) Length of Cutter 23 FIG. 4 shows the relationship between the effective length L in the longitudinal direction of the cutter 23 and the thickness B of the cutter applied to the roller cutter type fiber bundle cutting device of the present invention. . Here, the effective length L in the longitudinal direction of the cutter 23 means the cutter length of the portion exposed between the pair of collar portions 21 and 21 of the cutter roller 20 as shown in FIG. In the present embodiment,
The effective length L of the cutter 23 in the longitudinal direction is set to be the same as the length of the cutter blade stay 22 in the longitudinal direction and the distance between the facing surfaces of the collar portions 21.

In order to secure the strength of the cutter 23 that can withstand the cutting of the fiber bundle 1, the effective length L of the cutter 23 in the longitudinal direction is set with respect to the thickness B of the cutter 23 in the circumferential direction of the cutter roller. preferable. The length L of the cutter 23 and the thickness B of the cutter 23 are (L / 100) <
It is preferable that the expression B <(L / 10) is satisfied,
The range of (L / 75) <B <(L / 25) is particularly effective. The thickness B of the cutter 23 is 0.5 to 0.5 as described above.
2.0 mm is preferable, and the length L of the cutter 23 is 5 mm <L <200 mm with respect to the thickness B of the cutter 23.
It is particularly effective to set in the range of. However, (L /
100) <B <(L / 10), both the length L of the cutter 23 and the thickness B of the cutter 23 are set within a range that satisfies the formula.

If the length L of the cutter 23 is less than 5 mm, the diameter of the collar portion 21 of the cutter roller 20 must be increased, and the cuttability of the cutter 23 is significantly reduced, and the fiber bundle 1 is cut at a time. Hard to do. If the length L of the cutter 23 exceeds 200 mm, the strength, rigidity, etc. of the cutter 23 cannot be secured stably, so the cutter 2
Deformation 3 and blade spillage are likely to occur, and reliable cutting is not guaranteed. The length L of the cutter 23 is set to 5 mm <within a range that satisfies the formula (L / 100) <B <(L / 10).
By setting L <200 mm, U can be
There is no need to sandwich and support the cutter via the character-shaped cutter blade stay, and the cutter 2 can be used when the fiber bundle 1 is cut.
It is possible to endure a large local pressing force applied to No. 3 and improve the productivity of short fibers.

(7) Surface Roughness of Cutter 23 The taper surface of the tapered portion 23b of the cutter 23 has an Rz value of 0. 0 which represents the surface roughness measured by a commonly used stylus type surface roughness measuring instrument. 1 to 6.3 μm
Is desirable. More preferably 0.5 to 1.6
The range of μm is particularly effective. It provides high strength and toughness and gives the cutter 23 a high quality surface.

When the taper portion 23b is formed in two steps with different taper angles between the tip end side and the base body side,
The taper surface on the tip side of the tapered portion 23b preferably has an Rz value representing the surface roughness of 0.1 to 6.3 μm, and particularly preferably 0.5 to 1.6 μm. The taper surface on the base body side has an Rz value of 0.8 to 2 representing the surface roughness.
It is preferably 5.0 μm. More preferably 3.
2-12.5 μm is desirable. The surface roughness Rz is
The surface roughness of the taper surface on the base portion side and the surface roughness of the taper surface on the tip end side may be the same, for example. Due to such surface roughness,
The short fibers can be discharged more smoothly without the short fibers adhering to the surface of the cutter 23.

(8) Material of Cutter 23 The material of the cutter 23 is not particularly limited as long as it does not cause deformation or damage during the cutting of the fiber bundle 1. It is effective to appropriately select the material of the cutter 23 in order to remarkably exhibit the above-described effects. As a material of the cutter 23, for example, using a superhard alloy has a low friction coefficient as compared with general carbon tool steel 5 type (SK-5), and is excellent in low wear resistance and chemical stability, It is particularly effective because it has good durability.

(9) Height of Cutter Blade Stay 22 The height of the cutter blade stay 22 is the same as that of the cutter 23.
Similarly to the above, there is no particular limitation as long as it has a strength capable of withstanding a large pressing force generated when the fiber bundle 1 is cut and can reduce the discharge resistance of the short fibers. Preferably, the height of the cutter blade stay 22 is 5.0 to 2
It is 0 mm. More preferably, it is especially effective that the height of the cutter blade stay 22 is 8.0 to 15 mm.

The height of the cutter blade stay 22 is 20 m.
When it is larger than m, the discharge resistance of the cut short fibers becomes high, the short fibers cannot be discharged smoothly, and the short blades stay between the adjacent cutter blade stays 22 and / or the adjacent cutters 23. It may cause clogging or double cutting. Further, the height of the cutter blade stay 22 is 5 mm.
If it is smaller than the above, the cutter blade stay 22 and the cutter 23 may not be able to withstand the excessive local pressing force generated when the fiber bundle 1 is cut, and the cutter blade stay 22 and the cutter 23 may be deformed. Become.

(10) Material of the cutter blade stay 22 It is particularly effective to effectively use steel as the material of the cutter blade stay 22 because deformation or damage does not occur during the cutting of the fiber bundle 1. . It is particularly effective to use, for example, stainless steel or carbon steel for machine structure as the material of the cutter blade stay 22.

(11) Productivity In the present invention, the productivity of the short fibers is not particularly limited, but 5 kg / min to 50 kg / min, for example 50 to 50 kg / min.
It is particularly effective when cutting a fiber bundle of 300 Tex at a speed of 100 m / min or more.

Hereinafter, more specific examples of the present invention will be described together with comparative examples. The methods for measuring and evaluating characteristic values and the like are as follows. (1) Fineness 3 according to the method of 8-5-1A of JIS L-1015
The mass of 300 fibers cut to 0 mm was measured, the true fineness was calculated, and the average value of 5 times was calculated. (2) Number of crimps According to the method of 8-12-1 of JIS L-1015, counting the number of crimps per 25 mm when an initial load of 0.18 mN × display tex number is applied to one fiber, It was calculated from the average value of 20 times.

(Examples 1 to 17) An acrylic fiber bundle having a single yarn fineness of 3.3 dtex and a fiber bundle fineness of 150 ktex, which has been crimped with 11 pieces / 25 mm, has a cutter roller 20 having a diameter of 600 mm as shown in FIG. It is wound around and cut by pressing the cutter 23 with the pressing roller 30.
Short fibers were obtained. A cutter blade stay 22 made of carbon steel S25C for machine structure and a cutter 23 made of cemented carbide were used, and the distance between the pressing roller 30 and the cutting edge of the cutter 23 was set to 5 mm.

Then, the thicknesses of the cutter 23 and the cutter blade stay 22, the respective taper angles of the tip end side and the base end side of the cutter 23, and the taper portion 2 of the cutter 23.
3b height, cutter 23 overall height, cutter 23
Length, the height of the cutter blade stay 22, the surface roughness of the taper surface on the tip side and the taper surface on the base end side of the cutter 23, and the pitch P between the adjacent cutters 23.
Was variously changed and various tests were conducted. The results are shown in Table 1.
Shown in.

(Comparative Examples 1 to 3) Under the same conditions as in Examples 1 to 17, the thicknesses of the cutter 23 and the cutter blade stay 22, the taper angle on the tip side and the taper angle on the base end side of the cutter 23, Tapered portion 23 in cutter 23
b height, overall height of the cutter 23, surface roughness of the taper surface on the tip end side and the taper surface on the base end side of the cutter 23, and the pitch P between the adjacent cutters 23.
Various tests were performed with various changes. The results are shown in Table 1.

(Comparative Example 4) A U-shaped cutter blade stay for sandwiching and fixing the cutter 23 was used, and the pitch P between the adjacent cutters 23 was set to 20 mm. Short fibers were obtained. The results are shown in Table 1.

[0069]

[Table 1]

[Brief description of drawings]

FIG. 1 is a configuration explanatory view schematically showing an example of a roller cutter type fiber bundle cutting device which is a typical embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an explanatory diagram showing the relationship between the thickness of a cutter blade stay and the thickness of a cutter applied to the roller cutter type fiber bundle cutting device of the present invention.

FIG. 4 is an explanatory diagram showing a relationship between a cutter length and a cutter thickness applied to the roller cutter type fiber bundle cutting device of the present invention.

[Explanation of symbols]

1 fiber bundle 10 Fiber bundle cutting device 20 Cutter roller 21 Collar 21a Second opening 22 Cutter blade stay 23 Cutter 23a Base part 23b taper part 24 Cutter blade mounting plate 24a slit 24b First opening 25 Short fiber discharge section 26 short fiber conveying means 30 pressure roller 40 guide roller

Claims (8)

[Claims] 1. A cutter roller having a plurality of strip-shaped cutters fixedly mounted at a required pitch in a roller circumferential direction via a cutter blade stay, and a rotation axis line parallel to a rotation axis line of the cutter roller, A pressing roller arranged to face the cutter roller and pressing the fiber bundle wound around the cutter roller;
The thickness A of the cutter blade stay is the thickness B of the cutter.
A roller cutter-type fiber bundle cutting device, wherein the cutter blade stay is not thicker than the above, and the cutter blade stay supports the bottom surface of the cutter without protruding to the side surface in the pitch direction of the cutter. 2. The roller cutter type fiber bundle cutting device according to claim 1, wherein a thickness A of the cutter blade stay and a thickness B of the cutter are 0.5 to 2.0 mm. 3. The fiber according to claim 1, wherein the effective length L of the cutter in the longitudinal direction and the thickness B of the cutter in the circumferential direction of the cutter roller satisfy the following expression 1. Bundle cutting device. (L / 100) <B <(L / 10) …… 1 4. The pitch of the cutter is 10 to 100.
mm, The roller cutter type fiber bundle cutting device according to any one of claims 1 to 3. 5. The cutter comprises a base portion and a taper portion that gradually shrinks from the base portion toward the tip, and the taper angle of the taper portion is 10 to 40 °. The roller cutter type fiber bundle cutting device according to any one of claims 1 to 4. 6. The taper portion is formed in two steps with different taper angles on the tip end side and the base body side, and the taper angle on the base body side is more acute than the taper angle on the tip end side. The roller cutter type fiber bundle cutting device according to claim 5, wherein 7. The overall height of the tapered portion is 2.0 to
6.0 mm, and the total height of the cutter is 2
The roller cutter type fiber bundle cutting device according to any one of claims 1 to 6, wherein the fiber bundle cutting device has a diameter of 0 mm or less and a height of the tapered portion or more. 8. The taper surface on the tip side of the taper portion has an Rz value representing surface roughness of 0.1 to 6.3 μm, and the taper surface on the base portion side has an Rz value representing surface roughness. It is 0.8-25.0 micrometers, It is characterized by the above-mentioned.
The roller cutter type fiber bundle cutting device according to any one of 1 to 7.