WO2014122741A1

WO2014122741A1 - Fiber tow crimping device and method for manufacturing crimped fiber tow

Info

Publication number: WO2014122741A1
Application number: PCT/JP2013/052758
Authority: WO
Inventors: 友太渡部; 貞行浜屋; 政夫佐幸; 宏倫松岡
Original assignee: 富山フィルタートウ株式会社
Priority date: 2013-02-06
Filing date: 2013-02-06
Publication date: 2014-08-14
Also published as: CN104968844B; JP5635185B1; JPWO2014122741A1; CN104968844A

Abstract

According to the present invention, a tow-width restrictor (10a), constructed from a plate material shaped substantially as an isosceles triangle having an acute angle at the front tip with respect to the direction of travel, is disposed in the tow introduction part (10) of a pair of fiber-tow push-in rolls further upstream from the nip point (9) of push-in rolls (1, 2). A tow protrusion preventer (11a) for preventing fiber protrusion in the fiber tow (8) is disposed subsequent to the tow-width restrictor (10a) in a roll side surface that includes the nip point (9) of the pair of the push-in rolls (1, 2). The difference between the push-in roll width (A) and the distance (B) between the inner wall surfaces of a pair of protrusion prevention holding plates (15) is 0.2-12 mm. The distance (C) between the tip of the tow-width restrictor (10a) and the nip point (9) of the push-in rolls (1, 2) is 0-22 mm.

Description

Fiber tow crimping apparatus and method for producing crimped fiber tow

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 the 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 non-uniform 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 fiber tow indentation crimping apparatus capable of producing a tow and a method for producing a crimped fiber 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. The tow width restricting portion is made of a plate material that exhibits a wedge shape of a substantially isosceles triangle shape with the toe introducing portion having an acute angle in the traveling direction tip portion, A roll width A of the serial push roll, and the inner wall surface distance B of said pair of toe-width regulating portion is in the following (1) crimping device pushing the fiber tows comprising satisfies the equation.
12mm ≧ A−B ≧ 0.2mm (1)

According to a preferred aspect, it is desirable that the push roll width A and the distance B between the inner wall surfaces of the pair of tow width restricting portions satisfy a condition of 12 mm ≧ AB ≧ 0.2 mm, and more preferably, As shown in the following equation (2), the difference between the pushing roll width A and the distance B between the inner wall surfaces is set within a range of 2 mm to 0.2 mm.
2mm ≧ A−B ≧ 0.2mm (2)

Furthermore, each of the pair of tow width restricting portions has a groove portion where an end portion in the width direction of the tow travels, and each groove height is 3% or more and 15% or less with respect to the roll width A, respectively. The groove width is preferably 5 to 15 times the thickness of the tow.
It is preferable that the roll width A (mm) and the total fineness D (dtex) of the fiber tow satisfy the following expression (3).
5 × 10 ⁻⁴ ≧ (A-2) /D≧3.5×10 ⁻⁴ (3)

On the other hand, a preferable distance C between the tip of the toe width regulating portion and the nip point of the push roll is preferably 22 mm ≧ C> 0 mm as in the following expression (4).
22mm ≧ C> 0mm (4)

Further, it is desirable that the protrusion for preventing protrusion is made of a material having excellent seizure resistance, and the toe width regulating portion is made of a material having excellent 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 (5) Formula.
12mm ≧ AB ≧ 0.2mm (5)

It is preferable that the range in which the fiber tow width is narrowed with respect to the roll width of the pushing roll is a range that satisfies the following expression (6).
2mm ≧ AB ≧ 0.2mm (6)

In the second basic configuration of the present invention, each of the pair of tow width restricting portions has a groove portion in which an end portion in the width direction of the tow travels, and each groove height is 3% with respect to the roll width A. The groove width is preferably 15% or less, and each groove width is preferably 5 to 15 times the thickness of the tow.
It is preferable that the roll width A (mm) and the total fineness D (dtex) of the fiber tow satisfy the following expression (7).
5 × 10 ⁻⁴ ≧ (A-2) /D≧3.5×10 ⁻⁴ (7)

On the other hand, the preferable distance C between the tip of the toe width regulating portion and the nip point of the pushing roll is preferably 22 mm ≧ C> 0 mm as in the following equation (8).
22mm ≧ C> 0mm (8)

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 regulation part is sent to the following toe protrusion prevention part. 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 prevention parts. 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 roll and the inner distance B of the pair of tow sticking prevention press plates satisfy the condition of 12 mm ≧ AB−0.2 mm, the tow meander and the stick roll do not protrude, The operation of the crimping device due to the quality abnormality of the crimped fiber tow is hardly stopped. In addition, the tip of the tow width restricting portion has a substantially isosceles triangular wedge shape in which the toe introduction portion has an acute angle in the traveling direction tip, so that the nip point of the pair of push rolls and the tip of the tow width restricting portion Therefore, the apparatus can be stably operated for a long time without causing inconveniences due to factors such as the press plate, the pushing roll, and the friction between the fiber bundles described above.

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 of FIG. It is arrow sectional drawing along the III-III line of FIG. 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. It is the schematic which shows the roll width A and the distance B between inner wall surfaces. FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8 showing the shortest distance C between the traveling direction front end of the toe width restricting portion and the nip point of the pair of pushing rolls. It is a figure which expands the part enclosed with the broken line of FIG. 9, and shows the state which remove | excluded the fiber tow 8 and the crimped fiber tow 8a.

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 pushing

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 8, the pressing plate 15 for preventing protrusion of the fiber tow 8 according to the present invention is arranged between the first and second

pressing 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 that reinforces and supports each member is fixed on the back surface of the toe width regulating portion 10a and the protrusion preventing portion 11a. The entire toe width restricting portion 10a is made of a rectangular plate 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 passage surface. The first thin 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 so as to cut out approximately 1/3 of the wedge-shaped portion 10a-2 to form a second thin portion 10a-4. ing. Incidentally, in one example of the present embodiment, the overall length of the tow width restricting portion 10a is 94.86 mm, the thickness of the main body portion 10a-1 is 6.7 mm, and the thickness of the first thin portion 10a-3 is The thickness of the second thin portion 10a-4 is 0.6 mm and 2 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 restricting portion 10a, the toe side edge guide groove 10a- having a concave cross section continuously extending from one end thereof 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 passing 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 FIGS. The distance B (the distance between the inner wall surfaces) 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 introducing portion 10 is the fiber supplied to the toe introducing portion 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 preventing portions 11a starts from the step portion of the first thin portion 10a-3 that constitutes the wedge-shaped portion 10a-2 of the toe width regulating portion 10a. 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 the present 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, various materials such as alumina are used as the material of the toe protrusion preventing portion 11a, and its thickness 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.

Furthermore, 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 arranged 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 cigarette filter (total fineness of 19000 dtex to 44000 dtex), it is from 10 mm to 21 mm. The roll width B is between, and the thickness of the tow is preferably in the range of 0.2 mm to 1 mm, and more preferably in the range of 0.3 mm to 0.8 mm.

In order to adjust the thickness of the tow, the roll width A (mm) and the total fineness D (dtex) of the fiber tow should be 5 × 10 ⁻⁴ ≧ (A-2) /D≧3.5×10 ⁻⁴ It is preferable to satisfy.

Here, as shown in FIG. 8, in particular, 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 that 12 mm ≧ AB ≧ 0.2 mm. Thus, there is no tow meandering and no tow protrusion on the first and second pushing

rolls

1 and 2, and in particular, the wear of the first and second pushing

rolls

1 and 2 and the tow protrusion preventing presser plate 15 in the protrusion preventing portion 11 a The crimping device for the fiber tow 8 can be operated for a long period of time without reducing seizure and causing abnormal quality of the crimped fiber tow 8a. From the above viewpoint, the difference between the pushing roll width A and the distance B between the inner wall surfaces is more preferably 0.5 mm or more and 8 mm or less, and further preferably 1 mm or more and 4 mm or less. Further, as shown in FIG. 9 and FIG. 10 which is a partially enlarged view thereof, the distance C between the nip point of the pair of first and second push rolls 1 and 2 and the tip of the toe width regulating portion 10a is 22 mm ≧ C By setting> 0 mm, the apparatus can be operated without causing the above-described disadvantages. The upper limit of the distance of C is 22 mm, but is preferably 15 mm or less, and more preferably 12 mm or less from the viewpoint of preventing the tow from protruding. The lower limit of the distance of C is preferably as close to 0 as it can prevent the toe from protruding, but is preferably 1 mm or more, and more preferably 5 mm or more from the viewpoint of preventing contact between the tow width regulating portion and the pushing roll.

The shape of the toe width restricting portion is such that the toe introduction portion has a substantially isosceles triangular wedge shape with an acute angle at the tip in the running direction, and the tip is close to the nip point, and the strength of the tip is sufficient. This is preferable.

Each of the pair of tow width restricting portions preferably has a groove portion where an end portion in the width direction of the tow runs, and the groove height is preferably 3% or more and 15% or less with respect to the roll width A, and the groove width is The thickness is preferably 5 to 15 times the thickness of the tow.
If the groove height is 3% or more with respect to the roll width A, it becomes easy to reduce tow sway, and if it is 15% or less, it becomes easy to reduce rubbing when the tow contacts the groove. The groove height is more preferably 5% or more and 12% or less.

Further, if the groove width is 5 times or more of the thickness of the tow, it is easy to reduce the contact of the tow with the groove, and if it is 15 times or less, it is easy to reduce the shake of the tow. The groove width is more preferably 7 times or more and 13 times or less.
By having this groove, it is possible to suppress tow shake and to introduce the tow into the pushing roll in a stable state.

Hereinafter, the present invention will be described more specifically with experimental examples.

<Number of abnormalities>
The number of abnormalities was continued under the same conditions for 3 months, and the number of adjustments of the device and the number of crimp failures occurred during that time were counted.

<Number of device abnormalities>
In Experimental Example 2, the operation was continued for one week under the same conditions, and the number of device adjustments that occurred during that time was tabulated.

<Crimping state evaluation method>
The crimped state was evaluated according to the following criteria.
○: Uniform ventilation resistance and good passability in the tow band processing step.
(Triangle | delta): Ventilation resistance is somewhat non-uniform | heterogenous, or the permeability | transmittance of a tow band process is a little inferior from usual.
X: Ventilation resistance is non-uniform or the tow band processing step is significantly inferior than usual and is not acceptable as a product.

[Experimental Example 1]
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 (AB) between the distance B between the wall surfaces of the pair of tow protrusion prevention press plates is 0.4 mm, 1 mm, 5 mm, 10 mm, and 15 mm, the tip of the tow width regulating portion, and the nip point of the push roll. For each difference (AB) between each tow width regulating portion and the distance B between the wall surfaces of the toe protrusion prevention presser plate, a total of 20 types of 20 mm. The tow width restriction section is installed (with the tow width restriction section), and the operation is continued under the same conditions for 3 months each, and the number of adjustments of the device and the number of crimp failures occurring during that time are counted and obtained. The crimped state of the crimped fiber tow was judged as good or bad.
Further, as a comparative example, the same operation was performed immediately after removing the 20 tow width restricting portions (without the tow width restricting portion), and the number of quality abnormalities was averaged.

The fiber tow used in this Experimental Example 1 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. Further, even when the above range was slightly deviated, the crimp at the fiber bundle end was slightly non-uniform, but the product value was not impaired.

[Experiment 2]
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 2, and as shown in Table 2, left and right having first and second push roll widths A, tow width regulating portions, and tow protrusion preventing portions. The difference between the distance B between the walls of the pair of tow protrusion prevention press plates (AB) is 1.6 mm, and the distance C between the tip of the tow width regulating portion and the nip point of the push roll is 11 mm, 18 mm, 25 mm 3 A tow width restriction section is installed (with a tow width restriction section), and the operation is continued under the same conditions for one week. It was determined good or bad crimp state of the crimp fiber tow to be.

The fiber tow used in this Experimental Example 2 was an acetate fiber tow having a single yarn fineness of 2.7 dtex and a total fineness of 35,000 dtex. Table 2 shows the distance C between the tip of the tow width regulating portion and the nip point of the pushing roll and the crimped state under each condition. In addition, the number of attempts to improve the crimped state by adjusting the device before the crimped state becomes unacceptable is shown.

As shown in Table 2, as a result of examining the case where the distance C between the tip of the tow width regulating portion and the nip point of the pushing roll is further increased, the crimped state is a good result when the distance C is 11 mm, and is 18 mm. Then, it was a little uneven, but not so much that the product value was not damaged. On the other hand, when the distance C is 25 mm, even if the adjustment of the apparatus is repeated, a tow that can accept the crimped state cannot be obtained, and the crimped state becomes defective and the product value is impaired.

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 (toe) nip point 10 (toe) introduction part 10a toe width regulating part 10a-1 body part 10a-2 wedge part 10a-3 first thin part 10a-4 second thin part 10a-5 toe side edge guide groove 10b backup plate 11 (tow) lead-out part 11a (tow) protrusion prevention part 12 crimper box 12a doctor blade 12b flapper 12c crimped fiber tow thread 13 regulating the width adjusting device 13a wedge-shaped slider 13b adjusting screw 14 the bracket 15 (toe) anti-extrusion presser plate

Claims

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, and the fiber tows that are continuously supplied 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 toe width restricting portion is made of a plate material exhibiting a wedge shape having a substantially isosceles triangular shape with a sharp tip at the traveling direction tip,
A fiber in which the roll width A of the pushing roll and the distance B between the inner wall surfaces in the toe width direction of the toe running part where the fiber tows of the pair of tow width regulating parts run satisfy the following expression (1): Tow crimping device.
12mm ≧ A−B ≧ 0.2mm (1)
The roll width A of the pushing roll and the distance B between the inner wall surfaces in the toe width direction of the toe travel part where the fiber tows of the pair of tow width regulating parts travel satisfy the following expression (2): Item 2. The fiber tow crimping device according to Item 1.
2mm ≧ A−B ≧ 0.2mm (2)
Each of the pair of tow width restricting portions has a groove portion where an end portion in the width direction of the tow travels, and each groove height is 3% or more and 15% or less with respect to the roll width A. 3. The fiber tow crimping apparatus according to claim 1, wherein the width is not less than 5 times and not more than 15 times the thickness of the tow.
The crimping apparatus for fiber tow according to claim 1 or 2, wherein the roll width A (mm) and the total fineness D (dtex) of the fiber tow satisfy the following expression (3).
5 × 10 −4 ≧ (A-2) /D≧3.5×10 −4 (3)
The fiber tow crimping apparatus according to claim 1 or 2, wherein the shortest distance C between the tip in the running direction of the toe width regulating portion and the nip point of the pair of push rolls satisfies the following expression (4).
22mm ≧ C> 0mm (4)
A presser plate for preventing fiber toe from protruding is arranged on both side surfaces of the pair of toe push-in rolls, and a crimper box is arranged at the rear of the pair of toe push-in rolls. A method for producing a crimped fiber tow, which is pressed into the crimper box through rolls to obtain a crimped fiber tow by imparting crimps to the fiber tow,
The fiber tow is arranged at the toe introduction portion of the push roll, and the push roll is configured so that the fiber tow width is reduced by a pair of tow width regulating portions made of a plate material having a substantially isosceles triangular wedge shape with a sharp tip in the traveling direction. The manufacturing method of the crimped fiber tow which has the process of narrowing to the range which satisfies the following (5) Formula with respect to the roll width | variety of this.
12mm ≧ AB ≧ 0.2mm (5)
The method for producing a crimped fiber tow according to claim 6, wherein a range in which the fiber tow width is narrowed with respect to the roll width of the push-in roll is a range that satisfies the following expression (6).
2mm ≧ AB ≧ 0.2mm (6)
An end in the width direction of the fiber tow is included in the pair of tow width regulating portions, the height is 3% or more and 15% or less with respect to the roll width A, and the width is 5 times or more with respect to the thickness of the tow. The method for producing a crimped fiber tow according to claim 6 or 7, wherein the method runs in a groove that is 15 times or less.
The method for producing a crimped fiber tow according to claim 6 or 7, wherein the roll width A (mm) and the total fineness D (dtex) of the fiber tow satisfy the following expression (7).
5 × 10 −4 ≧ (A-2) /D≧3.5×10 −4 (7)
The method for producing a crimped fiber tow according to claim 6 or 7, wherein the shortest distance C between the tip in the running direction of the tow width regulating portion and the nip point of the pair of pushing rolls satisfies the following expression (8).
22mm ≧ C> 0mm (8)