JP2017109184A - Defibrating device and production method of fibrous material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defibrating device capable of uniformly defibrating a raw material sheet, ensuring the flow passage of air between cutter plates and preventing a defibrating roll from overheat and the like.SOLUTION: A defibrating device 10 making a fibrous material by pulverizing a raw material sheet includes: a plurality of cutter plates 13; a defibrating roll 12 rotated and driven in one direction; and a raw material sheet supply mechanism 16 introducing the raw material sheet 31A to the outer peripheral surface of the defibrating roll 12. The cutter plates 13 are provided with a plurality of rotary blades 13a arranged in the circumferential direction of a periphery and plate parts 13b supporting the rotary blades 13a. The length of the rotary blades 13a in the axial length direction X of the defibrating roll 12 is formed so as to be longer than that of the plate parts 13b and continuous spaces 17 are formed over the whole circumference in the circumferential direction Y of the defibrating roll between plate parts 13b, 13b of adjacent cutter plates.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a defibrating machine and a method for producing a fibrous material.

  A rotating drum having a concave portion for accumulation formed on the outer peripheral surface thereof as an apparatus for producing a laminated body used as the whole or a part of an absorbent body of an absorbent article such as a disposable diaper, a sanitary napkin, an incontinence pad, and the rotating drum The fibrous material is provided with a duct that supplies the fibrous material in a scattered state toward the outer peripheral surface of the sheet, and a material supply unit that supplies the fibrous material in the duct, and is supplied in a scattered state through the duct There is known an apparatus for producing a piled body, in which after the material is sucked and deposited in the concave part for stacking, it is released from the concave part for accumulation to obtain a piled body having a predetermined shape. The material supply unit of such a fiber stack manufacturing apparatus is generally equipped with a defibrator that is an apparatus for pulverizing a raw material sheet of a pulp sheet with a rotary blade into a cotton-like fibrous material, and pulverizing with the defibrator. The resulting fibrous material is fed into the duct.

As the defibrator, for example, a plurality of cutter plates having a plurality of crushing blades (rotating blades) arranged in the circumferential direction on the outer peripheral edge, and a plurality of cutter plates in a state of penetrating the plurality of cutter plates in the thickness direction. It is known to have a defibrating roll having a fixed rotating shaft, and it is also known to fix the cutter plate at intervals in the axial direction of the defibrating roll.
Patent Document 1 also proposes fixing at least one of the plurality of cutter plates to the rotation shaft in a state of being inclined with respect to a direction orthogonal to the rotation axis of the defibration roll.

WO2015 / 037466A1 JP-A-2005-144408

In a conventional defibrating machine, the reason why the cutter plates are fixed with an interval in the axial direction is to secure an air flow path between the cutter plates. Yes. In this type of defibrator, it is necessary to secure an air flow path for cooling. Therefore, a portion where the rotary blade does not contact is generated.
On the other hand, in the technique described in Patent Document 1, when the cutter plate is fixed with an interval in the axial direction of the defibration roll, a region where no rotary blade exists in the axial direction of the defibration roll is generated, It is a technique to prevent partial defibration in the width direction, and the cutter blade is tilted with respect to the direction orthogonal to the rotation axis of the defibration roll, and a rotating blade generated between adjacent cutter plates By periodically moving the gaps that do not exist in the width direction of the raw material sheet, the air flow path is secured between the cutter plates, and the portion that does not hit the rotary blade in the width direction of the raw material sheet is not made. .

According to the technique of Patent Document 1, by adjusting the angle and interval of the cutter plate, it is possible to prevent a portion that does not hit the rotary blade in the width direction of the raw material sheet. It is also possible to prevent an area where no hits occur. Thereby, compared with the case where the area | region where a rotary blade does not hit at all arises in the width | variety of a raw material sheet, it can prevent that a defibration defective part arises in a raw material sheet.
However, in the technique of Patent Document 1, there are regions in the width of the raw material sheet that are different from each other in the frequency of contact with the rotary blade, so there is room for improvement from the viewpoint of uniformly defibrating the raw material sheet.

  In Patent Document 2, a rotary blade formed by arranging a large number of blades each having a blade edge (rotary blade) partially protruding toward the outer periphery in the axial direction, and the shape of the blade edge of the rotary blade are described. Although a pulverizing apparatus including a fixed blade provided with a suitable concave portion is described, the pulverizing apparatus is not a pulverizing apparatus used in a pile manufacturing apparatus, and a pulp sheet can be introduced into this apparatus. It is difficult to defibrate the entire pulp sheet uniformly. In addition, since a continuous space that communicates in the circumferential direction is not formed between the blades, it is difficult to stably introduce a product generated by defibration into a duct or the like without forming a lump. .

  The present invention relates to providing a defibrating machine that can solve the problems of the prior art and a method for manufacturing a fibrous material using the defibrating machine.

  The present invention is a defibrating machine for pulverizing a raw material sheet into a fibrous material, having a plurality of cutter plates, driven to rotate in one direction, and toward the outer peripheral surface of the defibrating roll A raw material sheet supply mechanism that introduces the raw material sheet, and the cutter plate includes a plurality of rotary blades arranged in a circumferential direction of an outer peripheral portion, and a plate portion that supports the rotary blades, and the rotary blade The length of the defibrating roll in the axial length direction is longer than that of the plate portion, and the entire length of the defibrating roll in the circumferential direction is between the plate portions of the adjacent cutter plates. A defibrating machine in which a continuous space is formed is provided.

  The present invention is a method of manufacturing a fibrous material using the above-described defibrating machine to obtain a fibrous material by pulverizing a raw material sheet, and collides with the rotary blade over the entire width direction of the raw material sheet. A method for producing a fibrous material is provided.

According to the defibrating machine of the present invention, the raw material sheet can be defibrated more uniformly than before, an air flow path can be secured between the cutter plates, and overheating of the defibrating roll can be prevented.
According to the method for defibrating a raw material sheet of the present invention, the raw material sheet can be defibrated more uniformly than before, and a more homogeneous fibrous material can be obtained.

FIG. 1 is a schematic perspective view showing an apparatus for producing a stacked body in which an embodiment of the defibrator of the present invention is incorporated. FIG. 2 is a bird's-eye view from above of the main part of the defibrator shown in FIG. FIG. 3 is a perspective view showing a cutter plate and a spacer constituting the defibrating roll of the defibrator shown in FIG. FIG. 4 is a schematic diagram showing the defibrating roll of the defibrator shown in FIG. 1 and the leading end portion of the raw material sheet fed to the peripheral surface thereof. FIG. 5 is an outer peripheral development view showing a part of the outer peripheral portion of the defibrating roll of the defibrator shown in FIG. FIG. 6A is a perspective view of a defibrating roll of a defibrator that is another embodiment of the present invention, and FIG. 6B is an enlarged view of a portion surrounded by a square in FIG. is there. FIG. 7 is a view corresponding to FIG. 5 showing a main part of still another embodiment of the present invention. FIG. 8 is a view corresponding to FIG. 5 showing a main part of still another embodiment of the present invention.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
As shown in FIG. 1, the defibrating machine 10 according to an embodiment of the present invention is preferably used as a whole or a part of an absorbent body 3B of an absorbent article such as a disposable diaper, a sanitary napkin, or an incontinence pad. It is used by being incorporated in a pile manufacturing apparatus 100 for manufacturing the fine body 3.
The fiber bundle manufacturing apparatus 100 shown in FIG. 1 has a rotating drum 2 in which a plurality of accumulation recesses 22 are formed at predetermined intervals on an outer peripheral surface, and a fibrous material 31 toward the outer peripheral surface of the rotating drum 2. A duct 4 that is supplied in a scattered state and a material supply unit 1 that supplies a fibrous material 31 into the duct 4 are provided. The rotating drum 2 has a non-rotating main body part 20 having a plurality of spaces A to D partitioned therein, and an outer peripheral part 21 provided around the main body part 20 and driven to rotate in the direction of arrow a. The main body 20 is connected to exhaust means and air supply means (not shown), and during the operation of the manufacturing apparatus 100, the space A and the space B are maintained at a negative pressure, and the space C is maintained at a positive pressure. Is done. The accumulation recess 22 is provided in the outer peripheral portion 21, and the bottom surface of the accumulation recess 22 is made of a porous plate such as a mesh plate. During the operation of the manufacturing apparatus 100, the accumulation concave portion 22 is sucked from the bottom surface while passing over the space A maintained at a negative pressure, whereby the material supply portion 1 side is placed in the duct 4. An air flow toward the outer peripheral surface of the rotary drum 2 is generated.

  The material supply unit 1 described above includes a casing 70 having an introduction port 71 for the raw material sheet 31 </ b> A, and a hood 72 having an arcuate cross section along the outer peripheral surface of the defibrating roll 12 is provided in the casing 70. . The hood 72 is provided with an introduction path (not shown) for the raw material sheet 31 </ b> A extending from the introduction port 71 to the outer peripheral surface of the defibrating roll 12.

The defibrating machine 10 is provided in the material supply unit 1 of the pile manufacturing apparatus 100.
The defibrating machine 10 pulverizes a raw material sheet 31 </ b> A such as a pulp sheet to form a fibrous material 31, and the produced fibrous material 31 is passed through a material supply port 11 opened into the duct 4 to the duct 4. Supplied in. When the fibrous material 31 is supplied into the duct 4 during the operation of the manufacturing apparatus 100, the fibrous material 31 flows in a scattered state toward the outer peripheral surface of the rotary drum 2 in the duct 4. After that, they are sucked and deposited in the individual recesses 22 for accumulation. The fibrous material 31 deposited in the accumulation recess 22 becomes the pile 3 having a shape along the shape of the inner surface of the accumulation recess 22, and in the discharge portion 23 provided below the rotary drum 2, the accumulation recess 22. It is released from the inside onto the covering sheet 32. After the fiber stack 3 released from the covering sheet 32 is conveyed by a known conveying means such as a vacuum conveyor 5, the entire circumference of the cross section perpendicular to the flow direction MD is wrapped in the covering sheet 32. It is cut by a known cutting means 6 such as a rotary die cutter and becomes an absorbent body 3B having a length used for each absorbent article.

  As shown in FIG. 1, the defibrating machine 10 according to the present embodiment introduces a defibrating roll 12 that is rotationally driven in one direction indicated by an arrow b, and a raw material sheet 31 </ b> A toward the outer peripheral surface of the defibrating roll 12. And a raw material sheet supply mechanism 16. The raw material sheet supply mechanism 16 includes a known nip roll 18. The raw material sheet 31 </ b> A is continuously supplied by the nip roll 18 toward the outer peripheral surface of the defibrating roll 12 at a predetermined speed. The raw material sheet 31 </ b> A is preferably introduced so as to be substantially perpendicular to the outer peripheral surface of the defibrating roll 12.

  The defibrating roll 12 includes a plurality of cutter plates 13 shown in FIG. 3 and a plurality of spacers 14 shown in FIG. 3, and a single rotating shaft 15 in the central insertion holes 13 c and 14 c formed in the center of each. And is fixed to the rotary shaft 15. The spacer 14 is interposed between adjacent cutter plates 13 in the axial length direction X of the defibrating roll 12. As a method for fixing the cutter plate 13 and the spacer 14 to the rotating shaft 15, any method capable of fixing them can be employed. The defibrating roll 12 is supported by bearings (not shown) at both ends of the rotating shaft 15 protruding from the casing 70, and the power from a power source such as a motor is used to transmit any power such as a gear or a belt. It is transmitted to the rotary shaft 15 by means and is driven to rotate.

As shown in FIGS. 3 and 4, the cutter plate 13 used in the present embodiment includes a plurality of rotary blades 13 a arranged in the circumferential direction of the outer peripheral portion, and a plate portion 13 b that supports the rotary blade 13 a. . The plate portion 13b of the cutter plate 13 has a disc shape, and the central insertion hole 13c is formed in the central portion. The spacer 14 also has a disk shape, and the central insertion hole 14c is formed in the central portion. The spacer 14 has a diameter less than that of the plate portion 13b.
As shown in FIG. 3, the rotary blade 13 a of the cutter plate 13 is provided so as to protrude outward in the radial direction from the outer peripheral edge of the plate portion 13 b of the cutter plate 13, and the axial length direction of the defibrating roll 12 As viewed from X, the cutter plate 13 has a triangular cross-sectional shape having a top at the outermost portion in the radial direction. A plurality of rotary blades 13 a are provided at regular intervals in the circumferential direction of the plate portion 13 b of the cutter plate 13. The number of rotary blades 13a included in one cutter plate 13 is, for example, 5 or more and 50 or less, and is not particularly limited.

  In the defibrating roll 12 of the present embodiment, as shown in FIG. 4, a spacer 14 having a smaller diameter than the plate portion 13 b is interposed between the cutter plates 13. An air circulation space 17 is formed between the plate portions 13 b and 13 b facing each other between a pair of adjacent cutter plates 13. The air circulation space 17 exists continuously around the entire periphery of the spacer 14. More specifically, the air circulation space 17 includes a first space 17 a that passes between the protruding portion c of the rotary blade 13 a of the adjacent one of the cutter plates 13 and the spacer 14, and a rotary blade of the other cutter plate 13. 13 a and a second space 17 b that passes between the overhanging portion c of the spacer 13 and the spacer 14, and each of the first space 17 a and the second space 17 b has an annular shape that continues around the entire circumference of the spacer 14. It is a space.

  Moreover, as for the cutter plate 13, the length La (refer FIG. 4) of the axial length direction X of the defibrating roll 12 of the rotary blade 13a is longer than the length Lb of the plate part 13b of the same direction X, respectively. Moreover, the rotary blade 13a has the overhang | projection parts c and c which protrude in the axial length direction X of the defibrating roll 12 on each of the both sides of the plate part 13b. That is, the cutter plate 13 has a rotary blade 13a that is wider than the plate portion 13b in the axial length direction X of the defibrating roll 12.

In the defibrating machine 10 of the present embodiment, the defibrating roll 12 has the spacer 14 between the cutter plates 13 and the air circulation space 17 between the adjacent plate portions 13b and 13b. The heat generated by the friction with the air can be efficiently dissipated through the air circulation space 17, resulting in inconveniences such as scorching and melting of the raw material sheet 31 </ b> A caused by overheating of the defibrating roll 12 and the cutter plate 13. Can be prevented. In addition, since the cutter plate 13 has a rotating blade 13a that is wider than the plate portion 13b, as shown in FIG. 4, the raw material sheet 31A that is struck and defibrated by the rotating blade 13a of one cutter plate 13 is used. Between the region R1 and the other region R1 of the raw material sheet 31A which is struck and defibrated by the rotary blade 13a of the other cutter plate 13 adjacent to the cutter plate, by the rotary blade 13a of any cutter plate It is possible to suppress the generation of the region R2 that is not hit.
Thus, according to the defibrating machine 10 of the present embodiment, the raw material sheet 31A can be defibrated more uniformly than before, an air flow path can be secured between the cutter plates 13, and the defibrating roll is overheated. In addition, it is possible to prevent the raw material sheet 31A from being burnt or melted. When the defibrating roll 12 or the cutter plate 13 is overheated, it is burnt when a pulp sheet is used as a raw material sheet, and is melted when a resin sheet such as a synthetic fiber is used. For example, in an absorbent body such as a diaper or a napkin, foreign matters are mixed in, and therefore it is desirable to reliably prevent them.

The rotary blade 13a may have an overhanging portion c that protrudes in the axial length direction X of the defibrating roll 12 only on one side of the plate portion 13b. It is preferable that the provided rotary blade 13a has the protruding portions c on both sides of the plate portion 13b from the viewpoint of improving the strength of the rotary blade 13a.
In the cutter plate 13 of the present embodiment, the protruding portion c of the rotary blade 13a rises steeply in the axial length direction X from the outer peripheral edge of the plate portion 13b with respect to the connection portion between the rotary blade 13a and the plate portion 13b. It has become. That is, when viewed from the direction orthogonal to the axial direction X, the connecting portion between the rotary blade 13a and the plate portion 13b is T-shaped. Thereby, the surface area of the rotary blade 13a spreads and the heat dissipation effect improves.

  Moreover, in the defibrating machine 10 of the present embodiment, unlike the case of Patent Document 1, unlike the case where the cutter plate 13 is inclined with respect to the rotation axis to eliminate the region where the rotary blade 13a does not contact the raw material sheet 31A, the raw material Occurrence of regions that differ greatly in the frequency with which the rotary blade 13a hits in the width direction of the sheet 31A is also suppressed. That is, in the defibrating roll 12 of this embodiment, as shown in FIG. 5, the rotary blades 13 a are provided at the same pitch in the circumferential direction of the defibrating roll 12 in any cutter plate 13. On each raw material sheet 31 </ b> A shown in FIG. 4, for each region R <b> 1 struck by the rotary blade 13 a of one cutter plate 13, the individual rotary blades 13 a that are intermittently arranged in the circumferential direction as the cutter plate 13 rotates. The position where the blade edge 13t hits is indicated by a thin line e. The interval between the thin lines e is the same for the region R1 hit by the rotary blade 13a of any cutter plate 13, and any region R1 is the same number of times per fixed length in the moving direction M of the raw material sheet 31A. Has been defibrated. Thus, according to the defibrating machine 10 of the present embodiment, unevenness in the number of collisions occurring within the width of the raw material sheet 31A can be suppressed or reduced, and the raw material sheet is defibrated more uniformly than the conventional defibrating machine. And a more homogeneous fibrous material can be obtained.

On the other hand, in the configuration in which the cutter plate is inclined as in Patent Document 1, there is a difference in the number of collisions in the hit region R1 (the number of collisions at the end of the region is small), resulting in defibration unevenness. . Further, if the inclination angle is further increased in order to eliminate the difference in the number of collisions in the hit region R1, the number of collisions will be reduced overall, which may cause deterioration of the defibrated state. Therefore, in any case, the number of collisions must be increased as a whole by increasing the number of rotations of the defibrating roll 12 or increasing the diameter of the cutter plate. As a result, the former is a component caused by vibration or friction. In addition to causing fatigue damage, heat generation becomes significant. In the latter case, the size of the defibrator is increased, resulting in deterioration of maintainability and excessive occupation of space. Here, the above problem is naturally affected by the speed at which the raw material sheet 31 </ b> A is put into the defibrating roll 10. That is, as the input speed increases, the number of collisions per fixed length in the moving direction M of the raw material sheet 31A decreases, and the defibrated state tends to deteriorate. Therefore, when the defibrating apparatus as in Patent Document 1 is applied as the piled body manufacturing apparatus 100 that manufactures the piled body 3, the speed of the manufacturing apparatus 100 is hindered.
However, according to an embodiment of the present invention, the above-described problems can be solved, and even when applied as a piled body manufacturing apparatus 100 that manufactures the stacked fiber body 3, the speed of the apparatus can be increased.

In a preferred embodiment of the method for producing a fibrous material of the present invention, in producing the fibrous material 31 by pulverizing the raw material sheet 31A in this way, the region R2 that is not hit in the width direction of the raw material sheet 31A. In the region R1 to be hit, the rotary blade 13a is caused to collide evenly. Thereby, the unevenness | deflection of the fibrillation resulting from the frequency which the rotary blade 13a hits is suppressed, and the fibrous material 31 defibrated more uniformly than before is obtained.
From the viewpoint of suppressing the occurrence of defibration defects, the number of strikes (number of collisions) of the rotary blade 13a per mm in the movement direction M of the raw material sheet 31A is preferably 3 times or more, and more preferably 5 times or more. preferable. The upper limit is not particularly limited, but is preferably 20 times or less, for example.
Further, the rotational speed of the defibrating roll 10 is preferably 6000 rpm or less, more preferably 4000 rpm or less in consideration of vibration, wear of the sliding portion, and the like. Although a minimum in particular is not restrict | limited, For example, it is preferable that it is 100 rpm or more.
In order to make the rotary blade 13a collide evenly, it is necessary to prevent the region R2 that is not struck by the rotary blade 13a of the cutter plate 13 from occurring, but the width of the region R2 is within 1.2 mm. When the distance is preferably within 0.6 mm, the fiber is defibrated by receiving the force from the cutter plates 13 on both sides thereof, so that there is no region that is not hit by the rotary blade 13a of any cutter plate 13.

  Further, in the defibrating machine 10 of the present embodiment, as described above, the air circulation space 17 formed between the plate portions 13b, 13b of the pair of cutter plates 13 extends around the spacer 14 over the entire circumference. Therefore, the fibrous material 31 generated by striking with the cutter plate 13 flows smoothly in the air circulation space 17 without staying between the plate portions 13b and 13b, and the duct 4 Supplied in. Such an effect is more reliably achieved by the fact that each of the first space 17a and the second space 17b is an annular space continuous over the entire circumference of the spacer 14 as in the present embodiment.

From the viewpoint of more effectively achieving one or more of the effects described above, the defibrating roll 12 preferably has the following configuration.
In the cutter plate 13, the length La of the rotary blade 13a is preferably 200% or more, more preferably 250% or more, and preferably 500% or less, more preferably 400, of the length Lb of the plate portion 13b. % Or less, preferably 200% or more and 500% or less, more preferably 250% or more and 400% or less.
The overhanging portion c protruding from the plate portion 13b of the rotary blade 13a is preferably such that the gap d between adjacent rotary blades 13a is 1.2 mm or less, and is 0.6 mm or less. More preferably.

The length of the spacer 14 in the direction along the axial length direction X of the defibrating roll 12 is 1 mm or more, more preferably 3 mm or more, preferably 10 mm or less, more preferably 6 mm or less, preferably 1 mm or more and 10 mm. Hereinafter, it is more preferably 3 mm or more and 6 mm or less.
In the radial direction of the defibrating roll 12, the difference Lc between the distance from the center line of the rotary shaft 15 to the rotary blade 13a of the cutter plate 13 and the distance from the center line of the rotary shaft 15 to the outermost part of the spacer 14 is: The diameter of the defibrating roll 12 is preferably 60% or more, more preferably 70% or more, and preferably 90% or less, more preferably 80% or less, preferably 60% or more and 90% or less, More preferably, it is 70% or more and 80% or less. The diameter of the defibrating roll 12 is the distance from the center line of the rotating shaft 15 to the cutting edge 13t of the rotary blade 13a of the cutter plate 13.

  In the defibrating roll 12 in the defibrating machine 10 of the present embodiment, the cutter plates 13 adjacent in the axial length direction X of the defibrating roll 12 are arranged such that the position of the rotary blade 13a is as shown in FIG. Is shifted in the circumferential direction Y. Thereby, an air flow path is secured also between the rotary blades 13a, and the heat dissipation efficiency of the defibrating roll 12 is improved. In the example shown in FIG. 5, in the adjacent cutter plates 13, the position of the rotary blade 13a is shifted by a half pitch with respect to the circumferential pitch P of the rotary blade 13a (same as the distance between the tops). In the adjacent cutter plates 13, the position of the rotary blade 13a may be shifted by a half pitch or less with respect to the circumferential pitch P of the rotary blade 13a (same as the distance between the tops), or may be shifted by a half pitch or more. May be.

  FIG. 6A and FIG. 6B are examples of a defibrating roll having a cutter plate 13 in which the position of the rotary blade 13a is shifted by a half pitch or less with respect to the pitch P in the circumferential direction of the rotary blade 13a. In addition, an air flow path indicated by an arrow in FIG. 6B is secured between the rotary blades 13a, whereby excellent heat dissipation efficiency can be obtained. In the embodiment shown in FIGS. 6A and 6B, the load on the shaft portion of the defibrating roll 12 and a drive system (such as a motor) that drives the shaft portion is small, and the rotary blade 13a and the raw material sheet There is also an advantage that vibration caused by the collision with 31A can be suppressed.

7 and 8 are development views of the outer peripheral portion of the defibrating roll according to another embodiment of the present invention.
As for the defibrating roll 12 which shows the principal part in FIG. 7, the position of the rotary blade 13a has shifted | deviated to the circumferential direction Y of the defibrating roll 12, as for the cutter plate 13 adjacent in the axial length direction X of the defibrating roll 12, Furthermore, some of the rotary blades 13 a overlap in the circumferential direction Y of the defibrating roll 12. By forming a region where a part of the rotary blade 13a overlaps in the circumferential direction Y, it is possible to prevent the region R2 that is not struck from being generated, and the number of impacts per rotation (number of collisions) of the defibrating roll 12 ) Can be increased. Thereby, the raw material sheet 31A can be defibrated more uniformly, and a more homogeneous fibrous material without defibration failure can be obtained.
The overlapping width g (see FIG. 7) of the rotary blade 13a is preferably 10% or more, more preferably 60% or more, and preferably with respect to the length of the defibrating roll 12 of the spacer 14 in the axial length direction X. Is not more than 150%, more preferably not more than 100%, preferably not less than 10% and not more than 150%, more preferably not less than 60% and not more than 100%.

  8, the position of the rotary blade 13a of the cutter plate 13 adjacent in the axial length direction X of the defibration roll 12 is in the same position in the circumferential direction Y of the defibration roll 12. .

  As shown in FIG. 1, in the case of using the defibrating machine 10 which is one embodiment of the present invention for the production of the stacked fiber body 3, in addition to supplying the fibrous material 31 to the duct 4 by the defibrating machine 10, the water absorption It is also preferable to supply a functional polymer. The water-absorbing polymer is introduced from, for example, a spray pipe 33 provided in the middle of the duct 4 and supplied into an air stream that conveys the fibrous material 31.

  The absorbent article incorporating the laminated body 3 or the absorbent body 3B including the laminated body 3 typically has a liquid between a liquid-permeable top sheet and a liquid-impermeable or water-repellent back sheet. It has a retentive absorber. In the absorbent body 3B, the upper and lower surfaces of the fiber stack 3 may be covered with a single cover sheet 32, or may be covered with a plurality of cover sheets. The back sheet may be liquid-impermeable and may or may not have water vapor permeability. The absorbent article may further include various members according to specific uses of the absorbent article. Such members are known to those skilled in the art. For example, when the absorbent article is applied to a disposable diaper or a sanitary napkin, a pair or two or more pairs of three-dimensional guards can be arranged on the outer side of both sides of the absorbent body.

  As the raw material sheet in the present invention, conventionally, various materials used for absorbent bodies of absorbent articles such as sanitary napkins, panty liners, disposable diapers and the like can be used without particular limitation. A fiber sheet such as a nonwoven fabric may be used. The fibrous material obtained by defibrating the raw material sheet is preferably a cellulosic fiber such as pulp fiber, rayon fiber, or cotton fiber, and more preferably pulp fiber. The fibrous material obtained by defibrating the raw material sheet may be one kind of these fibers or two or more kinds. The fibrous material constituting the pile 3 is preferably 50 to 100% by mass of the pulp fiber in the fibrous material, more preferably 80 to 100% by mass, and still more preferably 100% by mass. It is. In addition to the fibrous material and the water-absorbing polymer, a deodorant or an antibacterial agent may be supplied into the duct as necessary. The water-absorbing polymer may or may not be supplied.

  Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include a polymer and a saponified product thereof, and polyaspartic acid. A fiber and a water absorbing polymer can be used individually by 1 type or in combination of 2 or more types.

  As mentioned above, although one Embodiment of the defibrating machine of this invention was described, this invention is not restrict | limited to embodiment mentioned above, Each can be changed suitably. For example, the outer diameter of the spacer 14 may not be circular. Two or more spacers 14 may be interposed between the cutter plates 13. The spacer 14 may not be used as long as the cutter plate 13 can be fixed at a predetermined interval.

In relation to the above-described embodiment, the present invention further discloses the following supplementary notes (defibrating machine, manufacturing method of fibrous material).
<1>
A defibrating machine for pulverizing a raw material sheet into a fibrous material, having a plurality of cutter plates, driven to rotate in one direction, and the raw material sheet toward the outer peripheral surface of the defibrating roll The cutter plate has a plurality of rotary blades arranged in the circumferential direction of the outer peripheral portion, and a plate portion that supports the rotary blades, and the rotary blade has the solution described above. A space in which the length of the fiber roll in the axial direction is longer than that of the plate portion, and is continuous between the plate portions of the adjacent cutter plates over the entire circumference in the circumferential direction of the defibration roll. A defibrating machine that is formed.

<2>
The adjacent cutter plates are the defibrating machine according to <1>, wherein a position of the rotary blade is shifted in a circumferential direction of the defibrating roll.
<3>
The adjacent cutter plates are the defibrating machine according to <1> or <2>, wherein a part of the rotary blades overlap each other in a circumferential direction of the defibrating roll.
<4>
The defibrating machine according to any one of <1> to <3>, wherein a spacer having a smaller diameter than the plate portion is interposed between the adjacent cutter plates.
<5>
The defibrating machine according to any one of <1> to <4>, wherein the plate portion has a disk shape.
<6>
The defibrating machine according to any one of <1> to <5>, wherein the rotary blade is provided so as to protrude outward in a radial direction from an outer peripheral edge of the plate portion.
<7>
Any of the above <1> to <6>, wherein the rotary blade has a triangular cross-sectional shape having an apex at the outermost portion in the radial direction of the cutter plate when viewed from the axial length direction of the defibrating roll. The defibrating machine according to 1.
<8>
The defibrating machine according to any one of the above items <1> to <7>, wherein the rotary blade has a protruding portion protruding in the axial length direction of the defibrating roll on each side of the plate portion.

<9>
A spacer having a smaller diameter than the plate portion is interposed between the adjacent cutter plates, and an air circulation space is formed between the opposing plate portions of the adjacent cutter plates outside the outer peripheral portion of the spacer. ,
The distribution space is a first space that passes between the protruding portion of the rotating blade of one adjacent cutter plate and the spacer, and a first space that passes between the protruding portion of the rotating blade of the other cutter plate and the spacer. Two spaces,
The defibrating machine according to any one of <1> to <8>, wherein each of the first space and the second space is an annular space continuous over the entire periphery of the spacer. .
<10>
With respect to the connecting portion between the rotary blade and the plate portion, the protruding portion of the rotary blade rises sharply in the axial length direction from the outer peripheral edge of the plate portion, and is viewed from the direction orthogonal to the axial length direction. The defibrating machine according to any one of <1> to <9>, wherein a connection portion between the rotary blade and the plate portion is T-shaped.
<11>
In the cutter plate, the length of the rotary blade is preferably 200% or more, more preferably 250% or more, and preferably 500% or less, more preferably 400% or less of the length of the plate part. The defibrator according to any one of <1> to <10>, preferably 200% to 500%, more preferably 250% to 400%.
<12>
The overhanging portion protruding from the plate portion of the rotary blade is preferably such that the gap between the adjacent rotary blades is 1.2 mm or less, and is 0.6 mm or less. The defibrating machine according to any one of <1> to <11>, wherein is more preferable.

<13>
The length of the spacer 14 in the direction along the axial length direction of the defibration roll is 1 mm or more, more preferably 3 mm or more, preferably 10 mm or less, more preferably 6 mm or less, preferably 1 mm or more and 10 mm. Hereinafter, the defibrating machine according to any one of <1> to <12>, more preferably 3 mm to 6 mm.
<14>
In the radial direction of the defibration roll, the difference between the distance from the center line of the rotating shaft to the rotating blade of the cutter plate and the distance from the center line of the rotating shaft to the outermost part of the spacer is The diameter of the fine roll is preferably 60% or more, more preferably 70% or more, and preferably 90% or less, more preferably 80% or less, preferably 60% or more and 90% or less, more preferably Is a defibrating machine according to any one of <1> to <13>, which is 70% or more and 80% or less.
<15>
The overlapping width of the rotary blades is preferably 10% or more, more preferably 60% or more, and preferably 150% or less, more preferably with respect to the length of the spacer in the axial length direction of the defibrating roll. Is 100% or less, preferably 10% or more and 150% or less, and more preferably 60% or more and 100% or less, according to any one of <1> to <14>.
<16>
The defibrating machine according to any one of <1> to <15>, wherein the raw material sheet is a wood pulp sheet or a fiber sheet.

<17>
A method for producing a fibrous material using the defibrating machine according to any one of <1> to <16>, wherein a fibrous material is obtained by pulverizing a raw material sheet, the entire region in the width direction of the raw material sheet The manufacturing method of the fibrous material which makes the said rotary blade collide over.
<18>
The fiber according to <17>, wherein the number of hits or collisions of the rotary blade per mm in the moving direction of the raw material sheet is preferably 3 times or more, more preferably 5 times or more, and preferably 20 times or less. A method for producing a material.
<19>
The rotational speed of the defibrating roll 10 is preferably 6000 rpm or less, more preferably 4000 rpm or less, and preferably 100 rpm or more, the method for producing a fibrous material according to <17> or <18>.
<20>
A rotating drum having an accumulation recess formed on the outer peripheral surface, a duct for supplying the fibrous material in a scattered state toward the outer peripheral surface of the rotating drum, and supplying the fibrous material into the duct And a material supply unit, wherein the fibrous material is deposited in the accumulation concave portion to form a fiber stack, wherein the material supply unit is the above-described <1> to <16> An apparatus for manufacturing a stacked body, comprising the defibrating machine according to any one of the above.
<21>
A raw material sheet is pulverized to obtain a fibrous material, and the fibrous material is deposited to form a laminated fiber body, which is a method for producing a laminated fiber body, wherein any one of the above items <17> to <19> The manufacturing method of a fiber pile which obtains the said fibrous material from the said raw material sheet using the manufacturing method of fibrous material of this.
<22>
A method for producing an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent disposed between the top sheet and the back sheet. The manufacturing method of an absorptive article whose whole or a part of the above-mentioned absorber is a layered product manufactured with the manufacturing method of the piled fiber object given in the above-mentioned <21>.

DESCRIPTION OF SYMBOLS 100 Fabrication body manufacturing apparatus 1 Material supply part 11 Material supply port 10 Defibration machine 12 Defibration roll 13 Cutter plate 13a Rotary blade 13t Cutting edge 13b Plate part 14 Spacer 15 Rotating shaft 16 Raw material sheet supply mechanism 17 Air distribution space 70 Casing 2 Rotating drum 3 Fiber pile 31 Fibrous material 32 Cover sheet 33 Spreading tube 3B Absorber 4 Duct

Claims (5)

A defibrating machine that pulverizes a raw material sheet into a fibrous material,
A defibrating roll having a plurality of cutter plates and rotationally driven in one direction, and a raw material sheet supply mechanism for introducing the raw material sheet toward the outer peripheral surface of the defibrating roll,
The cutter plate includes a plurality of rotary blades arranged in the circumferential direction of the outer peripheral portion, and a plate portion that supports the rotary blade, and the rotary blade has a length in the axial length direction of the defibrating roll, It is formed longer than the plate part,
A defibrating machine in which a continuous space is formed between the plate portions of the adjacent cutter plates over the entire circumference in the circumferential direction of the defibrating roll.   2. The defibrating machine according to claim 1, wherein the adjacent cutter plates are displaced in a circumferential direction of the defibrating roll from a position of the rotary blade.   The defibrator according to claim 1 or 2, wherein a part of the rotary blades overlap each other in the circumferential direction of the defibrating roll.   The defibrating machine according to any one of claims 1 to 3, wherein a spacer having a smaller diameter than the plate portion is interposed between the adjacent cutter plates. A method for producing a fibrous material using the defibrating device according to any one of claims 1 to 4 to obtain a fibrous material by pulverizing a raw material sheet,
The manufacturing method of the fibrous material which makes the said rotary blade collide over the whole area of the width direction of the said raw material sheet.