JP2013028875A - Apparatus for crimping filament tow, and method for manufacturing crimped filament tow - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: an apparatus for stuffing and crimping a filament tow, which does not cause any trouble such as single yarn breakage of the crimped filament tow and catching of the crimped filament tow by a stuffing roll, and frequent repairs and the like by shut-down due to excess abrasion of a pressing plate for preventing tow projection and the like, and is capable of continuously obtaining the high quality crimped filament tow; and a method for manufacturing the crimped filament tow.SOLUTION: In an apparatus for crimping a filament tow, a tow width-restricting part (10a) is disposed on an upstream side of a nip point (9) of stuffing rolls (1, 2) of a tow-introducing part (10) of a pair of filament tow-stuffing rolls, and a tow protrusion-preventing part (11a) for preventing filaments of a filament tow (8) from protruding is then disposed on a roll side face including the nip point (9) of the pair of stuffing rolls (1, 2). The difference between a stuffing roll width A and a distance B between inner wall surfaces of a pair of presser plates (15) for preventing protrusion is set to be not greater than 12 mm and not less than 0.2 mm, and a distance C between a tip end of the tow width-restricting part (10a) and the nip point (9) of the stuffing rolls (1, 2) is set to be not greater than 6.0 mm and greater than 0 mm.

Description

  The present invention relates to a fiber tow indentation crimping device for imparting buckling crimp to a fiber tow and a method for producing the fiber tow. More specifically, the present invention is excellent in operation operability at the time of crimping to a fiber tow through an indentation roll. The present invention also relates to a crimping apparatus capable of continuously and efficiently producing a crimped fiber tow without damage and a method for continuously producing a crimped fiber tow.

  As a method for imparting crimps to fiber tows, a crimping device using a pushing roll is widely used, and the crimping device using the pushing roll pushes the fiber tow into a crimping chamber through a pair of pushing rolls. To make crimped fiber tows. In order to produce a crimped fiber tow with this device, it is necessary for the push roll to grip the fiber tow with a predetermined gripping pressure, and the fiber tow sandwiched between the pair of push rolls is between the push rolls. And try to spread on both sides. In order to prevent the fiber tow from protruding from the left and right side surfaces of the push roll, press plates (sliding plates) are pressed against both sides of the push roll near the nip point for gripping the fiber tow. Since the presser plate continues to be applied to the fiber tow at the same time as the protruding pressure of the fiber tow on both sides of the press roll and the load caused by the rotation of the press roll, the press plate wears in a groove shape as the crimping device runs. Has the problem.

  As wear of the presser plate progresses, there is an adverse effect on the quality of the crimped fiber tow, such as the fiber tow being caught by the worn part and being cut, or uneven crimping occurring in the fiber tow. For this reason, in order to obtain a crimped fiber tow maintaining a predetermined crimp quality, it is necessary to periodically replace the presser plate and the push roll. The crimping apparatus must be stopped for the replacement, and the production efficiency of the crimped fiber tow is reduced with the stoppage. Therefore, there has been a strong demand for the development of an apparatus and method that can improve the reduction in the production efficiency of crimped fiber tows.

  From such a background, for example, Japanese Utility Model Publication No. 49-42249 (Patent Document 1) discloses a sliding surface of a pair of pressing plates (sliding plates) pressed against both side surfaces of a pair of pressing rolls in a fiber tow crimping apparatus. With a composite structure in which a material with excellent seizure resistance is arranged on a part of it, and a material with excellent wear resistance is arranged on the sliding contact surface with other tow fibers except for a part of it, it has excellent seizure resistance The surface on which the material is arranged is made higher than the surface on which the material with excellent wear resistance is arranged. As a result, there is no seizure with the nip roll, and the wear due to the tow is remarkably reduced, and it is possible to operate for a long time without causing any disturbance of crimping or yarn breakage.

  Further, for example, in Japanese Utility Model Laid-Open No. 50-77554 (Patent Document 2), at least the surface of the pressing roll is made of an alloy tool steel, so that the life is significantly improved as compared with stainless steel (SUS420). However, it is easy to handle because it is not brittle and excellent in workability compared to cemented carbide, and the processing accuracy is improved. Further, for example, according to Japanese Utility Model Publication No. 51-43653 (Patent Document 3) and Japanese Utility Model Publication No. 52-13391 (Patent Document 4), the center of the sliding piece (pressing plate) is removed from the nip point of the roll. The sliding piece (presser plate) can rotate freely around its center. Thereby, the wear of the sliding plate can be prevented.

Japanese Utility Model Publication No. 49-42249 Japanese Utility Model Publication No. 50-77554 Japanese Utility Model Publication No. 51-43653 Japanese Utility Model Publication No. 52-13391

  However, although these proposals are effective in extending the life of the presser plate (sliding plate) and push-in roll, they do not fundamentally eliminate the cause of friction between the presser plate, push-in roll, and fiber bundle. A sufficient effect could not be obtained to suppress the quality abnormality of the crimped fiber tow such as disorder of crimping.

  The present invention has been made in order to eliminate such problems, and its specific purpose is to fundamentally eliminate the cause of friction between the pressing plate, the pressing roll, and the fiber bundle, and to produce high-quality crimped fibers. An object of the present invention is to provide a tow belt pushing crimping apparatus and a crimping method capable of producing a tow.

  The present inventors fundamentally improved these problems without relying on the difficult means of extending the life of the presser plate in this type of indentation crimping device and the dangerous act of replacing the presser plate during operation of the device. As a result of intensive studies to develop a crimping device having the structure obtained, by providing a tow width restricting portion before the pushing roll, there is no occurrence of crimp torsion of the fiber tow, and the wear and damage of the presser plate The present inventors have found that a fiber tow crimping apparatus and method that are less likely to cause such inconveniences can be developed.

That is, in the first basic configuration of the present invention, a tow protrusion prevention press plate is arranged on both side surfaces of a pair of toe push-in rolls, and a crimper box is arranged at the rear of the pair of toe push-in rolls. A tow pressing / crimping device that pushes the supplied fiber tow into the crimper box through the pair of tow pressing rolls to impart crimps to the fiber tow, wherein the tow protrusion prevention presser plate is a pressing roll. A pair of tow width regulating portions arranged in the tow introduction portion of the tow and regulating the tow width of the fiber tow, and a tow overhang prevention portion arranged from the tow introduction portion to the tow derivation portion of the pushing roll to prevent the tow from protruding. A roll width A of the push-in roll, a distance B between the inner wall surfaces of the pair of toe width restricting portions, a tip of the toe width restricting portion, and a push-in roll And the distance C between the nip point Le is in the following (1) and (2) crimping device pushing the fiber tows comprising satisfies the equation.
12mm ≧ A−B ≧ 0.2mm (1)
6mm ≧ C> 0mm (2)

  According to a preferred aspect, it is desirable that the pushing roll width A and the distance B between the inner wall surfaces of the pair of tow width regulating portions satisfy a condition of 12 mm ≧ A−B ≧ 0.2 mm, more preferably pushing. The difference between the roll width A and the inner wall distance B is set in the range of 2 mm to 0.2 mm. On the other hand, the preferable distance C between the tip of the toe width restricting portion and the nip point of the pushing roll is preferably 6 mm ≧ C ≧ 0 mm. And it is desirable that the protrusion preventing presser plate is made of a material excellent in seizure resistance, and the toe width restricting portion is made of a material excellent in wear resistance and impact resistance.

Further, the second basic configuration of the present invention has a toe protrusion prevention presser plate on both side surfaces of the pair of toe push-in rolls, and a crimper box is arranged at the rear part of the pair of toe push-in rolls. A method for producing a crimped fiber tow, wherein a fiber tow to be fed is pushed into the crimper box through the pair of tow pushing rolls and crimped on the fiber tow,
The fiber tow protrusion prevention presser plate is disposed between a pair of tow width restricting portions for restricting the tow width of the fiber tow disposed in the toe introducing portion of the pushing roll and the tow leading portion of the pushing roll from the toe introducing portion. A toe protrusion preventing part for preventing toe protrusion,
When the roll width of the push roll is A, the distance between the inner wall surfaces of the pair of protrusion prevention press plates is B, and the distance between the tip of the toe width regulating portion and the nip point of the push roll is C, the following It exists in the manufacturing method of a crimped fiber tow characterized by satisfying (1) and (2) Formula.
12mm ≧ A−B ≧ 0.2mm (1)
6mm ≧ C> 0mm (2)

Here, any material can be used as the material of the tow width regulating portion as long as it has wear resistance and impact resistance. For example, stainless steel, alloy tool steel, cemented carbide or the like is used. In particular, it is preferable to use stainless steel having corrosion resistance.
On the other hand, it is preferable to use ceramics excellent in seizure resistance as the material of the tow protrusion prevention portion.

  A feature of the fiber toe crimping device according to the present invention is that a pair of tow width restricting portions are arranged in front of the toe introducing portion of the pushing roll, and the left and right side surfaces of the pushing roll extending from the toe introducing portion to the toe leading portion of the pushing roll. The point is that a toe protrusion prevention part is provided. By adopting the structure related to the toe crimping device, compared to the conventional crimping device that does not have a tow width regulating part, the running state of the fiber tow supplied to the pushing roll is caused to meander and sway. And can be stably supplied while maintaining a uniform toe width toward the nip point of the push roll.

  The fiber tow that has passed through the tow width restricting portion is sent to the subsequent toe protrusion preventing portion. At this time, the fiber tow is subjected to the pressing action of the pair of pushing rolls and starts to spread outward in the width direction, but the tow protrusion preventing portion arranged over the tow introducing portion and the leading portion is a side surface of the pushing roll. Even if the fiber tow tries to protrude abnormally from the gap between the upper and lower rolls, it is reliably suppressed.

  As described above, in the present invention, the protrusion plate is configured by the toe width restricting portion and the protrusion preventing portion so that the width of the fiber tow is set in advance before being fed between the pair of pushing rolls. The width of the tow is regulated and fed between the pair of pushing rolls. The fiber tow is gradually pressed there, and after passing through the nip point of the pushing roll, the pressure is gradually released, and the front crimper Send it to the box. The tow exit portion of the crimper box is prevented from freely passing through the tow, and the fiber tow pushed out from the push-in roll moves to the toe exit sequentially while being bent and deformed in a wave shape in the crimper box. At this time, fine crimps are made on the constituent fibers themselves of the fiber tow.

  Here, the entrance width in the toe width direction of the toe entrance of the crimper box is set to be slightly longer than the distance between the inner walls of the pair of toe protrusion preventing portions. Therefore, the denseness of the fibers present at the left and right edge portions of the fiber tow is released between the end point of the tow protrusion preventing portion and the toe entrance of the crimper box, and the denseness in the width direction of the fiber tow becomes uniform. Crimping is provided, and uniform crimping is obtained regardless of the length direction and width direction of the fiber tow. Furthermore, there is a great merit that the fiber toe pushing crimping device according to the present invention can be stably operated without applying excessive pressing force to the tow protrusion preventing presser plate.

In particular, if the width A of the push-in roll and the inner distance B of the pair of toe-preventing presser plates satisfy the condition of 12 mm ≧ A−B ≧ 0.2 mm, the tow meanders and does not protrude from the push-in roll, The operation of the crimping device due to the quality abnormality of the crimped fiber tow is hardly stopped. Also, the distance (C between the nip point of the pair of push rolls and the tip of the toe width regulating portion
) Is set to 6 mm ≧ C ≧ 0 mm, the apparatus can be stably operated for a long time without causing any inconvenience due to the above-described factors such as the pressing plate, the pressing roll, and the friction between the fiber bundles. .

It is a side view which cuts and shows the principal part of the continuous crimping apparatus of the fiber tow concerning this invention. It is arrow sectional drawing along the II-II line | wire of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is sectional drawing which expands and shows the S section of FIG. It is a longitudinal cross-sectional view which shows the structure of the tow | toe width control part and the toe protrusion prevention part in this invention. It is a side view which shows the arrangement | positioning relationship of the said tow | toe width control part and a tow | toe protrusion prevention part, and a pushing roll. It is a perspective view of the tow width restricting portion and the toe protrusion preventing portion.

Hereinafter, a fiber tow crimping apparatus which is a typical embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 and 2, reference numerals 1 and 2 denote a pair of upper and lower first and second pushing rolls, which are fixedly supported at the tips (right ends in FIG. 2) of the first and second rotating shafts 1a and 2a, respectively. Has been. The middle and the other end (the left end in FIG. 2) of the first and second rotating shafts 1a and 2a are rotatably supported by a plurality of bearings attached to the lower housing 4 and the upper housing 5. The other end of the rotating shaft 2a is connected to a drive source (not shown). The first rotating shaft 1a is connected to the second rotating shaft 2a via the gear 3, and rotates forward at a constant speed in the pushing direction of the fiber tow 8. Water sprays 7a and 7b are respectively disposed on the upper and lower parts of the rear housing 6, and the sprays 7a and 7b are directed to the respective surfaces of the first and second push rolls 1 and 2, and are rolled by water spray. Is prevented, and the wear of the protrusion preventing portion 11a of the protrusion preventing presser plate is suppressed.

  The first and second push rolls 1 and 2 have the same diameter, and a yoke 1b and a circular plate 2b are fixed to the center of the outer surface thereof. The present invention is characterized by the fiber tow 8 traveling in the direction of the arrow shown in FIG. 3 and an enlarged view of FIG. It has the introduction part 10 of the fiber tow 8 which becomes a part of the part, and the lead-out part 11 of the fiber tow 8. The introduction portion 10 is a region where the fiber tow 8 is introduced into the first and second push rolls 1 and 2, and the lead-out portion 11 is a region where the fiber tow 8 is pushed into the crimper box 12 after passing the nip point 9. In this embodiment, each area | region is an area | region about 1/4 of the diameter of the 1st and 2nd pushing rolls 1 and 2. FIG. The fiber tow 8 is gradually pressed by the first and second push rolls 1 and 2 at the introduction portion 10, and when the fiber tow 8 enters the lead-out portion 11 past the nip point 9, the pressure is gradually released.

  Since a flapper 12b (FIG. 1), which will be described later, which suppresses the passage of the fiber tow 8 is arranged near the toe exit of the crimper box 12, the crimper box 12 is pressed by the first and second pushing rolls 1 and 2. The extruded fiber tow 8 is forced to be pushed out in the lead-out part 11 and tries to advance while being given a fine crimp. Here, the fiber tow 8 travels through a triangular space formed between the peripheral surfaces of the first and second pushing rolls 1 and 2 and is filled into the crimper box 12 while being folded into a waveform in this space. . The filled fiber tow 8 is pulled out from the toe exit of the crimper box 12 at a constant speed against the restraining force of the flapper 12b. Therefore, the crimper box 12 is configured from the lead-out portion 11 to the toe exit of the crimped fiber tow 8a.

  As shown in FIGS. 4 to 7, the pressing plate 15 for preventing protrusion of the fiber tow 8 according to the present invention is arranged between the first and second pushing rolls 1 and 2 while restricting the tow width of the fiber tow 8 to a constant width. A pair of left and right toe width restricting portions 10a to be directed and a pair of left and right protrusion preventing portions 11a for preventing the fiber tow 8 from protruding from the side surfaces of the first and second push rolls 1 and 2 are provided. Further, a back-up plate 10b for reinforcing and supporting each member is fixed on the back surface of the toe width regulating portion 10a and the protrusion preventing portion 11a. The whole of the toe width restricting portion 10a is made of a rectangular plate material having an isosceles triangular wedge at the end near the nip point 9, and the wedge-shaped portion 10a-2 is opposite to the toe passing surface. The first thin-walled portion 10a-3 is formed by cutting out a little less than half of the entire length of the toe width regulating portion 10a on the surface through a step.

  Further, the toe passage side surface at the tip of the wedge-shaped portion 10a-2 is cut out through a step to form a second thin portion 10a-4 by cutting out about 1/3 of the wedge-shaped portion 10a-2. ing. Incidentally, according to the present embodiment, the overall length of the tow width regulating portion 10a is 94.86 mm, the thickness of the main body portion 10a-1 is 6.7 mm, the thickness of the first thin portion 10a-3 is 2 mm, The thickness of the second thin portion 10a-4 is 0.6 mm. These values are changed depending on the material and specifications of the peripheral member.

  In addition, at the center in the width direction of the toe passage surface of the tow width regulating portion 10a, the toe side edge guide groove 10a- having a concave cross section that extends continuously from one end to the tip of the first thin portion 10a-3. 5 is formed, and the edge in the width direction of the fiber tow 8 introduced into the toe introducing portion 10 is guided while sliding on the bottom surface of the toe side edge guiding groove 10a-5. The bottom surface of the toe side edge guide groove 10a-5 is flush with the surface on the toe passage side of the second thin portion 10a-4. The tow width of the fiber tow 8 passing through the toe side edge guide groove 10a-5 is restricted to a width smaller than the tow width before being introduced into the tow introducing portion 10, as shown in FIG. The distance (inner wall surface distance) B between the opposing bottom surfaces of the pair of left and right toe side edge guide grooves 10a-5 disposed across the toe passage of the toe introduction part 10 is a fiber supplied to the toe introduction part 10. It is determined by the toe width of the tow 8 and the circumferential roll width A of the first and second pushing rolls 1 and 2 determined by the toe width.

  As shown in FIGS. 5 to 7, the pair of left and right protrusion prevention portions 11 a starts from the step portion of the first thin portion 10 a-3 constituting the wedge-shaped portion 10 a-2 of the toe width regulating portion 10 a. The second thin portion 10a-4 extends beyond the tip of the second thin portion 10a-4 for a required length. Therefore, as shown in FIGS. 4 and 6, the protrusion preventing portion 11 a includes the first and second tow portions over the tow introducing portion 10 and the tow deriving portion 11 formed by the first and second pushing rolls 1 and 2. The push rolls 1 and 2 are disposed close to the side surfaces. According to this embodiment, the toe passage side surface of the protrusion preventing portion 11a is substantially on the same plane as the bottom surface of the toe side edge guide groove 10a-5 and the surface of the wedge-shaped portion 10a-2. Incidentally, the base material of the tow width restricting portion 10a is SUS440C, and its surface is finished by chrome spraying excellent in wear resistance and impact resistance. On the other hand, the ceramic material such as alumina is used as the material of the toe protrusion preventing portion 11a, the thickness thereof is 4.7 mm, and the plate width is equal to the plate width of the main body portion 10a-1 of the toe width regulating portion 10a. .6 mm.

  Further, a regulation width adjusting device 13 that adjusts the distance between the inner surfaces of the left and right tow width regulation parts 10a and the protrusion prevention part 11a is disposed outside the left and right toe width regulation parts 10a and the protrusion prevention part 11a. As shown in FIG. 4, the regulation width adjusting device 13 has a wedge plate-like slider 13a and an adjustment screw 13b attached to the bottom surface of the wedge plate-like slider 13a, and the adjustment screw 13b. By rotating the slider 13a, the slider 13a is displaced in the length direction, the left and right toe width regulating portions 10a and the protrusion plate 15 are moved toward and away from each other, and the distance between them is adjusted to adjust the fiber toe 8 Regulates the width dimension.

  On the other hand, the crimper box 12 formed on the downstream side of the lead-out portion 11 of the fiber tow 8 has a half portion on the side of the nip point 9 as shown in FIG. A pair of upper and lower doctor blades 12a, which are formed in an arc shape substantially along the surface and have a substantially wedge shape as a whole, and a bracket 14 for supporting the doctor blades 12a from above and below are provided. A crimped fiber tow passage 12c through which the crimped fiber tow 8a passes is formed between the upper and lower opposing surfaces of the bracket 14, and a flapper that urges the toe outlet side end portion from above to below by air pressure. 12b is provided. The flapper 12b suppresses the traveling of the fiber tow 8 so that the fiber tow 8 in the crimper box 12 cannot freely travel toward the toe exit. The outer shape of the toe exit side half of the crimper box 12 is a cubic box shape. The distance between the left and right side walls of the crimper box 12 varies depending on the roll width of the first and second push rolls 1 and 2, but in the case of a tow for a tobacco filter (total fineness of 19000 dtex to 44000 dtex), from 10 mm to 21 mm The roll width B between them is good.

  Here, in particular, when the difference between the pushing roll width A and the distance B between the wall surfaces of the pair of tow protrusion prevention pressing plates 15 satisfies the condition of 12 mm ≧ A−B ≧ 0.2 mm, The tow does not protrude from the first and second pushing rolls 1 and 2, and particularly the wear and seizure of the first and second pushing rolls 1 and 2 and the tow protruding prevention pressing plate 15 in the protruding prevention portion 11 a are reduced, and crimping is performed. The crimping device for the fiber tow 8 can be operated for a long period of time without causing an abnormal quality of the fiber tow 8a. Further, by setting the distance (C) between the nip point of the pair of push rolls 1 and 2 and the tip of the tow width regulating portion 10a to be 6 mm ≧ C ≧ 0 mm, the apparatus is operated without causing the above-described disadvantages. be able to.

Hereinafter, the present invention will be described more specifically with experimental examples.
[Experimental example]
1 and 2 in which the width of the pressing roll is 19 mm, the material of the tow width regulating portion is SUS440C stainless steel whose surface is finished by chrome spraying, and the material of the pressing plate for preventing toe protrusion is alumina ceramic. Prepared as shown in Table 1, and, as shown in Table 1, left and right having first and second push roll widths A, tow width restricting portions, and tow protrusion preventing portions. The difference between the distance B between the wall surfaces of the pair of tow protrusion prevention press plates (A−B) is 0.4 mm, 1 mm, 5 mm, 10 mm, and 15 mm, and the tip of the tow width regulating portion and the nip point of the pushing roll For each of the tow width regulating portions and the distance B between the wall surfaces of the toe protrusion prevention presser plate (A-B), a total of 20 types of 4 mm, 1 mm, 3 mm, 5 mm, and 7 mm. The same conditions for 3 months when the tow width restriction part is installed (with the tow width restriction part) and immediately after the removal of each of the 20 toe width restriction parts (without the tow width restriction part) The operation was continued, and the number of adjustments of the device and the number of crimp failures occurring during that time were tabulated, and whether the crimped state of the resulting crimped fiber tow was good or bad was determined.

  The fiber tow used in this experiment was an acetate fiber tow having a single yarn fineness of 3.3 dtex and a total fineness of 40,000 dtex. Abnormality and crimp failure of the fiber tow obtained at the tow introduction part and the tow lead part before and after the push roll when the tow protrusion prevention presser plate is provided is determined by the single tow breakage of the tow, uneven crimping, push roll Table 1 shows the number of occurrences of quality abnormalities such as hooking and the number of device adjustments associated therewith.

  As shown in Table 1, according to the apparatus of the present invention, the difference between the push roll width A and the distance B between the pair of protrusion prevention press plates is 12 mm or less, 0.2 mm or more, and the tip of the tow width regulating portion It can be seen that the quality abnormality of the crimped fiber tow is remarkably reduced by setting the distance C between the nip point of the pressing roll and the nip point of the pushing roll to 6 mm or less and greater than 0 mm. Moreover, when it deviated from the above-mentioned range, the crimp of the fiber bundle end portion was disturbed in a saw-tooth manner, resulting in a loss of product value.

1, 2 1st and 2nd pushing roll 1a, 2a 1st and 2nd rotating shaft 1b Yoke 2b Circular plate 3 Gear 4 Lower housing 5 Upper housing 6 Rear housing 7a, 7b Water spray 8 Fiber toe 8a Crimp fiber tow 9 Nip point 10 (toe) introducing portion 10a toe width regulating portion 10a-1 body portion 10a-2 wedge-shaped portion 10a-3 first thin portion 10a-4 second thin portion 10a-5 toe side edge guide groove 10b backup plate 11 (toe) lead-out part 11a toe protrusion preventing part 12 crimper box 12a doctor blade 12b flapper 12c crimped fiber tow passage 13 regulating width adjusting device 13a wedge-shaped slider 13b adjusting screw 14 bracket 15 toe protruding preventing presser plate

Claims (4)

A presser plate for preventing toe protrusion is arranged on both side surfaces of the pair of toe push rolls, and a crimper box is arranged at the rear of the pair of toe push rolls, so that the fiber tows that are continuously fed are fed to the pair of toe push rolls. A tow pushing and crimping device that pushes into the crimper box through the gap and imparts crimps to the fiber tow,
The presser plate for preventing the protrusion of the tow is
A pair of tow width regulating portions that are arranged in the toe introduction portion of the push roll and regulate the tow width of the fiber tow, and a tow protrusion that is arranged from the tow introduction portion to the toe lead-out portion of the push roll to prevent the fiber tow from protruding. With a prevention part,
The roll width A of the pushing roll, the distance B between the inner wall surfaces of the pair of tow width regulating portions, and the distance C between the tip of the tow width regulating portion and the nip point of the pushing roll are the following (1): And a fiber tow crimping apparatus satisfying the expression (2).
12mm ≧ A−B ≧ 0.2mm (1)
6mm ≧ C> 0mm (2) The tow width restricting portion is made of a plate material that exhibits a substantially isosceles triangular wedge shape with the toe introduction portion having an acute angle in the traveling direction tip portion, and the toe protrusion preventing portion is made of a rectangular plate material,
The roll width A of the push-in roll and the distance B between the inner wall surfaces of the pair of toe prevention presser plates satisfy the condition of 2 mm ≧ A−B ≧ 0.2 mm. Fiber tow crimping device. A pair of tow push rolls has press plates for preventing fiber toe from protruding, a crimper box is arranged at the rear of the pair of tow push rolls, and the fiber tows that are continuously fed are pushed into the pair of tow push rolls. A method for producing a crimped fiber tow, wherein the crimped fiber tow is produced by pushing into the crimper box through rolls and imparting crimp to the fiber tow,
The protruding plate for preventing the protrusion of the fiber tow is disposed between a pair of tow width restricting portions for restricting the tow width of the fiber tow disposed in the toe introducing portion of the pushing roll and the tow leading portion of the pushing roll from the toe introducing portion. A toe protrusion preventing part for preventing the fiber toe from protruding,
When the roll width of the push roll is A, the distance between the inner wall surfaces of the pair of protrusion prevention press plates is B, and the distance between the tip of the toe width regulating portion and the nip point of the push roll is C, the following A method for producing a crimped fiber tow, characterized by satisfying the expressions (1) and (2).
12mm ≧ A−B ≧ 0.2mm (1)
6mm ≧ C> 0mm (2) The tow width restricting portion is made of a plate material that exhibits a substantially isosceles triangular wedge shape with the toe introduction portion having an acute angle in the traveling direction tip portion, and the toe protrusion preventing portion is made of a rectangular plate material,
The roll width A of the push-in roll and the distance B between the inner wall surfaces of the pair of tow protrusion prevention press plates satisfy a condition of 2 mm ≧ A−B> 0.2 mm. Method for producing crimped fiber tow.

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