JP2017046928A - Method of manufacturing absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing an absorber which can suppress fibrillation faults of a synthetic fiber regardless of a feeding speed of a synthetic fiber sheet and can manufacture the absorber including the synthetic fiber and a pulp fiber at a desired mixture ratio.SOLUTION: A method of manufacturing an absorber 100 includes a fibrillation process in which a belt-like pulp sheet 10as formed of a pulp fiber 10a and a belt-like synthetic fiber sheet 10bs formed of a synthetic fiber 10b are fibrillated by using a fibrillation machine 21 and an accumulation process in which the fibrillated pulp fiber 10a and synthetic fiber 10b are mixed while conveying in the scattered state and are accumulated in an accumulating recessed part 41. The method of manufacturing in the invention includes a strength reduction process for performing processing of reducing tensile strength of the synthetic fiber sheet 10bs in a conveyance direction (Y direction) as a preprocessing of the fibrillation process.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing an absorbent body for absorbent articles.

  As an absorbent body used for absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads, for example, absorbent bodies containing pulp fibers and synthetic fibers are known. In this way, when the absorbent body contains synthetic fibers, the absorbent body can be given flexibility, and even if the body fluid absorbs the body body, a rough structure can be maintained in the body, and the body fluid can be pinpointed. Can absorb at high speed. As a manufacturing method of an absorbent body including pulp fibers and synthetic fibers, for example, Patent Document 1 and Patent Document 2 are known.

  Patent Document 1 describes a production method for producing a mixed cotton of pulp and synthetic fiber by dry mixing a sheet pulp pulverized into a nonwoven fabric formed from synthetic fiber using a combing roll. Has been.

  Further, Patent Document 2 does not require two or more rotating drums, and for one rotating drum, a defibrating apparatus and a fiber supplying which are fiber supplying means for conveying a fiber material or the like to the rotating drum. An absorber manufacturing apparatus having two or more sets of paths is described. Patent Document 2 describes that when a composite fiber layer of pulp fibers and synthetic fibers is produced, the synthetic fiber raw sheet is overlapped with the pulp raw sheet and introduced into the defibrating apparatus. .

Japanese Patent No. 2515748 Japanese Patent No. 4522349

  When a defibration defect occurs when a non-woven fabric (synthetic fiber original sheet) formed from synthetic fibers is defibrated, it causes a foreign body feeling to the absorber. Furthermore, when the absorbent body absorbs body fluid, the structure of the absorbent body becomes uneven, and the body fluid cannot be stably absorbed. In addition, synthetic fibers and pulp fibers have different fiber lengths and may aggregate for each fiber type during the production process, so the synthetic fibers and pulp fibers can be mixed uniformly without causing unevenness in the structure of the absorbent body. Realization of is not easy. Specifically, shortening the synthetic fiber by the combing roll as in Patent Document 1 described above is not preferable because it becomes difficult to obtain the low-density mixed layer described above. Moreover, in the manufacturing apparatus of patent document 2 mentioned above, since two defibrating machines are required, since an installation of an installation is accompanied, an installation load will become high.

  In order to perform uniform mixing with conventional equipment, it is preferable that the synthetic fiber sheet and the pulp sheet are defibrated together with one defibrator as in Patent Document 2 and mixed and stacked as they are. However, even if the synthetic fiber sheet and the pulp sheet are defibrated using a common feed device as in Patent Document 2, the mixing ratio depends on the width and basis weight of the synthetic fiber raw sheet. It is difficult to uniformly mix at a desired mixing ratio of both types of fibers by increasing the ratio of In general, since the basis weight of the synthetic fiber sheet is overwhelmingly smaller than the basis weight of the pulp sheet (for example, a basis weight difference of about 10 times), the supply rate of the synthetic fiber sheet is increased to a desired mixing ratio. When trying to adjust, when the ratio of the synthetic fiber is high, the supply speed becomes excessive, and there is a concern that a defibration failure of the synthetic fiber sheet by the defibrating machine may occur. As described above, regarding the problem of the mixing ratio due to the difference in sheet basis weight between the synthetic fiber original sheet and the pulp original sheet, and the problem of poor defibration due to the excessive supply speed of the synthetic fiber original sheet, Patent Documents 1 and 2 above. In the conventional defibrating technology as shown in FIG.

  Therefore, this invention is providing the manufacturing method of the absorber which can eliminate the fault which the prior art mentioned above has.

  The present invention relates to a defibrating step of defibrating a strip-shaped synthetic fiber sheet formed from pulp fibers and synthetic fibers formed from pulp fibers using a defibrating machine, and defibrated pulp fibers and synthetic fibers Are mixed while being conveyed in a scattered state, and a method for producing an absorbent article for absorbent articles comprising pulp fibers and synthetic fibers comprising a collecting step for collecting in a concave portion for collecting, before the defibrating step The manufacturing method of an absorber provided with the intensity | strength reduction process which performs the process which reduces the tensile strength of the conveyance direction of the said synthetic fiber sheet to a process is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the defibration defect of a synthetic fiber can be suppressed irrespective of the supply speed | rate of a synthetic fiber sheet, and the absorber containing a synthetic fiber and a pulp fiber with a desired mixing ratio can be manufactured.

FIG. 1 is a cross-sectional view showing a preferred embodiment of an absorber manufactured by the method for manufacturing an absorber of the present invention. FIG. 2 is a schematic perspective view showing a preferred embodiment of a production apparatus for producing the absorbent body shown in FIG. FIG. 3 is a schematic side view of the manufacturing apparatus shown in FIG. 2 viewed from the side. FIG. 4 is a schematic view of a part of the manufacturing apparatus shown in FIG. 2 as viewed from the top. FIG. 5 is an exploded perspective view of members forming the outer peripheral surface of the rotating drum provided in the manufacturing apparatus shown in FIG. FIG. 6 is a plan view of the outer peripheral surface including the concave portion for accumulation of the rotating drum provided in the manufacturing apparatus shown in FIG. 1. FIG. 7 is a view showing a state in which the fiber material and the absorbent particles are accumulated in the accumulation recesses of the rotating drum shown in FIG. FIG. 8 is a cross-sectional view of the state in which the fiber stack is transferred onto the core wrap sheet, as viewed in the width direction. FIG. 9 is a schematic perspective view of a strength reduction portion provided in a manufacturing apparatus according to another embodiment. FIG. 10 is a schematic perspective view of a strength reduction portion included in the manufacturing apparatus of still another embodiment.

Below, this invention is demonstrated, referring drawings based on the preferable embodiment.
The manufacturing method of this invention is a manufacturing method of the absorber for absorbent articles. FIG. 1 shows a cross-sectional view of an absorbent body 100 according to an embodiment manufactured by the absorbent body manufacturing method of the present embodiment. As shown in FIG. 1, the absorbent body 100 of the present embodiment includes pulp fibers 10a and synthetic fibers 10b. Preferably, the absorbent body 100 may be a single layer or a plurality of layers of two or more layers as long as it includes the pulp fiber 10a and the synthetic fiber 10b, but in this embodiment, the fiber material formed only from the pulp fiber 10a. And the absorbent particles 10c are formed into a two-layer structure in which a fiber material formed by mixing pulp fibers 10a and synthetic fibers 10b and an aggregate of absorbent particles 10c are overlapped.

  The absorbent body produced in the present invention is preferably used as an absorbent body for absorbent articles. The absorbent article is mainly used to absorb and retain body fluids excreted from the body such as urine and menstrual blood. Absorbent articles include, for example, disposable diapers, sanitary napkins, incontinence pads, panty liners, etc., but are not limited to these, and widely include articles used to absorb liquid discharged from the human body. To do. The absorbent article typically includes a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent body interposed between the two sheets. The absorber is an absorber formed by the method for manufacturing an absorber of the present invention. When the absorbent body produced in the present invention is used as an absorbent body of an absorbent article, from the viewpoint of improving the absorption performance, as shown in FIG. 1, a fiber material formed by mixing pulp fibers 10a and synthetic fibers 10b and It is preferable to arrange the aggregate with the absorbent particles 10c in the upper layer on the skin side.

  As the fiber material forming the absorbent body 100, various kinds of materials conventionally used in absorbent bodies for absorbent articles can be used without particular limitation. In addition to the pulp fiber 10a and the synthetic fiber 10b, rayon fibers, Short fibers of cellulosic fibers such as cotton fibers may be included. Examples of the synthetic fiber 10b include short fibers such as polyethylene, polypropylene, and polyethylene terephthalate. The synthetic fiber sheet 10bs formed from the synthetic fiber 10b is not particularly limited as long as it is a sheet shape, but is preferably a nonwoven fabric. In addition to the pulp fiber 10a and the synthetic fiber 10b, the fiber material forming the absorbent body 100 also includes absorbent particles 10c. Examples of the absorbent particles 10c include starch-based, cellulose-based, synthetic polymer, and superabsorbent polymer-based particles. Examples of the superabsorbent polymer include starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, cross-linked sodium carboxymethylcellulose, and acrylic acid (salt) polymer. Can be used. As the fiber material forming the absorbent body 100, a deodorant, an antibacterial agent, or the like can be further used as necessary.

  Next, the manufacturing method of the absorber of this invention is demonstrated with reference to FIGS. 2-7 taking the manufacturing method of the absorber 100 of one Embodiment mentioned above as an example. FIG. 2 shows an overall configuration of a manufacturing apparatus 1 according to an embodiment used for carrying out the manufacturing method of the present embodiment. In explaining the manufacturing method of the absorber 100 of this embodiment, the manufacturing apparatus 1 of this embodiment will be described first.

The manufacturing apparatus 1 shown in FIG. 2 is formed from the strength reduction part 5 which reduces the tensile strength of the strip | belt-shaped synthetic fiber sheet 10bs formed from the synthetic fiber 10b, and the pulp fiber 10a toward the downstream from the upstream side. The defibrating unit 2 for defibrating the strip-shaped pulp sheet 10as and the synthetic fiber sheet 10bs1 having a reduced tensile strength using the defibrating machine 21, and the defibrated pulp fiber 10a and the synthetic fiber 10b are scattered using the duct 3 And a stacking unit 4 that mixes while transporting and stacks in the stacking recess 41 of the rotating drum 4a. Further, in the manufacturing apparatus 1, a holding belt that is disposed along the outer peripheral surface 4 f of the rotating drum 4 a adjacent to the downstream side of the duct 3 and presses the absorbent material stack 100 a that is accumulated in the accumulation recess 41. 7 and a vacuum conveyor 8 disposed below the rotary drum 4a.
In the following description, the direction in which the pulp sheet 10as and the synthetic fiber sheet 10bs are conveyed is the Y direction, the direction orthogonal to the direction to be conveyed, and the width direction of the conveyed pulp sheet 10as and the synthetic fiber sheet 10bs are conveyed in the X direction. The thickness direction of the pulp sheet 10as and the synthetic fiber sheet 10bs will be described as the Z direction.

  The strength reduction part 5 is a part which performs the process which reduces the tensile strength of the conveyance direction (Y direction) of the synthetic fiber sheet | seat 10bs, and in the manufacturing apparatus 1, as shown in FIG.2 and FIG.3, the cutting apparatus 53 is used. ing. The cutting device 53 includes a plurality of score cut knives 51, 51, 51... And a plurality of score cut knives 51, 51, 51. And. The direction of each score cut knife 51 of the cutting device 53 is in the transport direction (Y direction). The plurality of score cut knives 51, 51, 51... Of the cutting device 53 are arranged in a direction (X direction) orthogonal to the transport direction (Y direction) of the belt-shaped synthetic fiber sheet 10bs formed from the synthetic fibers 10b. Has been placed. The interval between the score cut knives 51 and 51 adjacent to each other in the orthogonal direction (X direction) corresponds to the width (length in the X direction) of the cut sheet 10bc formed from the cut synthetic fiber 10b. In this embodiment, the whole of a plurality of cut sheets 10bc formed by being cut by the cutting device 53 is a synthetic fiber sheet 10bs1 having a reduced tensile strength.

  In the manufacturing apparatus 1, the defibrating unit 2 covers the pulp sheet 10as and the synthetic fiber sheet 10bs1 with reduced tensile strength, and the upper side of the defibrator 21, as shown in FIGS. And a casing 22. The defibrating unit 2 is a part that supplies the defibrated pulp fiber 10a and the synthetic fiber 10b, which are raw materials of the absorber 100, to the flow path 30 in the duct 3. In the manufacturing apparatus 1, the defibrating unit 2 is a pair of feed rolls 23 and 23 that supply the pulp sheet 10as to the defibrator 21 and a pair of synthetic fiber sheets 10bs1 having a reduced tensile strength. It has feed rolls 24 and 24 separately.

  In the manufacturing apparatus 1, the stacking unit 4 has a duct 3. As shown in FIGS. 2 to 4, the duct 3 extends from the defibrating unit 2 to the rotating drum 4 a, and the opening A on the downstream side of the duct 3 is maintained at a negative pressure in the space A of the rotating drum 4 a. 4f is covered. The duct 3 includes a top plate 31 that forms a top surface, a bottom plate 32 that forms a bottom surface, and both side walls 33 and 34 that form both side surfaces. Due to the operation of the intake fan (not shown) of the rotating drum 4a, the flow path 30 surrounded by the top plate 31, the bottom plate 32 and the side walls 33, 34 of the duct 3 is directed toward the outer peripheral surface 4f of the rotating drum 4a. An air flow for flowing the raw material of the absorber 100 is generated.

  Moreover, in the manufacturing apparatus 1, the duct 3 has the partition plate 35 which partitions the flow path 30 inside in the width direction (X direction), as shown in FIG.2 and FIG.4. The partition plate 35 is erected from the bottom plate 32 toward the top plate 31, and is disposed between the top plate 31 and the bottom plate 32. The partition plate 35 extends from the defibrating unit 2 side to the rotating drum 4a side. And the edge part by the side of the rotating drum 4a of the partition plate 35 is distribute | arranged on the centerline which passes along the center of the width direction (X direction) of the recessed part 41 for accumulation | storage provided with the rotating drum 4a mentioned later. Since one such partition plate 35 is provided, in the present embodiment, the flow path 30 formed inside the duct 3 is divided into two sections of the first flow path 30a in the width direction (X direction) and It is divided into second flow paths 30b. Further, the partition plate 35 has an adjustment mechanism that adjusts the position in the width direction (X direction) inside the duct 3. The partition plate 35 can adjust the position in the width direction (X direction) inside the duct 3 by the adjusting mechanism, and can adjust the sizes of the cross-sectional areas of the first flow path 30a and the second flow path 30b. It has become. The adjusting mechanism not only adjusts the position in the width direction (X direction) of the partition plate 35 inside the duct 3, but also adjusts the inclination of the partition plate 35 with respect to the center line in the width direction (X direction). It may be like this. If the adjustment mechanism can adjust the inclination of the partition plate 35 inside the duct 3 in this way, the cross-sectional area on the upstream side (the defibrating unit 2 side) of the first flow path 30a and the second flow path 30b and the first The cross-sectional areas on the downstream side (rotary drum 4a side) of the flow path 30a and the second flow path 30b can be individually adjusted.

  In the manufacturing apparatus 1, a polymer spray pipe 36 that supplies the absorbent particles 10 c into the duct 3 is disposed on the top plate 31 of the duct 3 as shown in FIGS. 2 to 4. More preferably, the polymer spray pipe 36 is provided in each of the first flow path 30a and the second flow path 30b, and in each polymer spray pipe 36, the absorbent particles 10c are placed in a device such as a screw feeder. It is to be supplied via (shown). Then, the supply amount of the absorbent particles 10c to the polymer spray tube 36 can be adjusted by an apparatus (not shown) such as each screw feeder. Therefore, by adjusting the supply amount of the absorbent particles 10c to each polymer spray pipe 36 by an apparatus (not shown) such as each screw feeder, the amount of the absorbent particles 10c sprayed in the first flow path 30a, In addition, the amount of the absorbent particles 10c dispersed in the second flow path 30b can be freely adjusted, and as a result, the blending ratio of the absorbent particles 10c in the pulp fiber 10a and the synthetic fiber 10b described later can be freely adjusted.

  In the manufacturing apparatus 1, the stacking unit 4 has a rotating drum 4a. As shown in FIGS. 2 and 3, the rotary drum 4a has a cylindrical shape, and receives a power from a prime mover (not shown) such as a motor, and the member forming the outer peripheral surface 4f has an arrow R around the horizontal axis. Rotate in the direction. The rotating drum 4 a includes a member 40 that forms the outer peripheral surface 4 f and a drum main body 42 that is positioned on the inner side of the member 40. The drum body 42 is fixed and does not rotate. Further, as shown in FIG. 2, the rotating drum 4 a has an accumulation recess 41 on the outer peripheral surface 4 f where the absorbent material is piled. In the manufacturing apparatus 1, the accumulation recess 41 is continuously arranged over the entire circumference in the circumferential direction (2Y direction) of the rotating drum 4a. In the figure, the 2Y direction is the circumferential direction of the rotating drum 4a, and the X direction is the width direction of the rotating drum 4a (a direction parallel to the rotation axis of the rotating drum 4a). As described above, the accumulation concave portion 41 of the manufacturing apparatus 1 is continuously arranged over the entire circumference in the circumferential direction (2Y direction) of the rotating drum 4a, but the circumferential direction (2Y direction) of the rotating drum 4a. ) May be arranged at a predetermined interval.

  As shown in FIGS. 2 and 3, the drum body 42 of the rotary drum 4 a has a plurality of mutually independent spaces, and the manufacturing apparatus 1 has, for example, three spaces A to C. Yes. The spaces A to C are partitioned by a plate provided from the rotating shaft side of the rotating drum 4a toward the outer peripheral surface 4f side. An intake fan (not shown) as an intake mechanism is connected to the rotary drum 4a, and the pressure in a plurality of partitioned spaces in the rotary drum 4a can be adjusted by driving the intake fan. Preferably, in the manufacturing apparatus 1, the suction force of the region corresponding to the space A that is the upstream region located in the region where the outer peripheral surface 4f is covered with the duct 3 is applied to the spaces B to C that are the downstream regions. The suction force in the corresponding region can be made stronger or weaker, and in the manufacturing apparatus 1, the space A is maintained at a negative pressure. In addition, the method of partitioning the space of the drum main body 42 is not limited to the above-described form. For example, the space A maintained at the negative pressure of the drum body 42 may be further divided into a plurality of spaces so that the pressure can be adjusted for each of the finely partitioned spaces. Further, for example, the space B of the drum main body 42 is further divided into a plurality of spaces, and the pressure can be adjusted for each of the finely divided spaces. The pressure of the space closest to the space A is set to the pressure of the space A. In this way, the negative pressure region can be made a little after the accumulation concave portion 41 passes through the duct 3.

  2 and 3, the member 40 that forms the outer peripheral surface 4f is arranged so as to cover the entire outer periphery of the drum main body 42, and receives power from a prime mover such as a motor. Rotate in the direction of arrow R around the horizontal axis. As shown in FIG. 5, the member 40 that forms the outer peripheral surface 4 f includes a rigid metal frame body 43 and a mesh plate 44 (porous) that is fixed to the frame body 43 in an overlapping manner. Member) and an absorber pattern forming plate 45 arranged to overlap the outer surface 44a side of the mesh plate 44.

  As shown in FIG. 5, the frame body 43 has a concave bottom surface corresponding portion 431 that overlaps with the bottom surface of the concave portion 41 for accumulation in the center of the drum width direction (X direction) in the plan view of the concave portion 41 for accumulation. Yes. Here, the “plan view” means that the object (accumulation concave portion 41 or the like) is viewed from the outside in the normal direction of the outer peripheral surface of the rotating drum 4a (the direction orthogonal to the rotating shaft direction of the rotating drum 4a). Means the case. The concave bottom surface corresponding part 431 is a non-position located between a plurality of through holes 432 penetrating the concave bottom surface corresponding part 431 in the thickness direction and two through holes 432 and 432 adjacent in the circumferential direction 2Y direction of the rotating drum 3. And a breathable rib 433. By having the through hole 432, the entire bottom surface corresponding portion 431 of the recess has air permeability. The plurality of through holes 432 are intermittently arranged in the circumferential direction 2 </ b> Y of the frame body 43. The non-breathable rib 433 is located between two through holes 432 and 432 adjacent in the circumferential direction 2Y, and is formed to extend in the drum width direction (X direction). The rib 433 mainly improves the strength of the frame body 43 itself. Each through-hole 432 is provided with a polymer in which a mesh plate 44 and an absorber pattern forming plate 45, which will be described later, are stacked, and is fixed to the frame body 43 by a known fixing means such as a bolt or an adhesive.

  As shown in FIG. 5, the mesh plate 44 is a member that constitutes the bottom surface of the accumulation recess 41 and is made of a porous member. The mesh plate 44 made of a porous member is flat and has a large number of fine ventilation holes, and the accumulation recess 41 in the outer peripheral surface 4f is maintained at a negative pressure in the rotary drum 4a. While passing through the space, the vent hole functions as a suction hole for sucking the raw material of the absorber 100. In the manufacturing apparatus 1, the mesh plates 44 and 44 are arranged for each of the two through-holes 432 and 432 adjacent in the circumferential direction 2Y so that the accumulation concave portion 41 is continuously arranged over the entire circumference of the rotating drum 4a. The mesh plate 44 is arranged so as to be continuous over the entire circumference of the rotary drum 4a. As the mesh plate 44, a metal or resin mesh, a porous metal plate or a resin plate in which a large number of pores are formed by etching or punching on a metal or resin plate, or the like can be used. Examples of the porous metal plate or resin plate forming the mesh plate 44 include a metal or resin plate (stainless steel plate or the like) having a thickness of about 0.1 to 0.5 mm.

  As shown in FIG. 5, the absorber pattern forming plate 45 is a member whose outer surface 45a is located on the outermost side of the rotating drum 4a and forms a part of the outer peripheral surface 4f. It is also a member to be formed. Here, “the outer peripheral surface of the concave portion for accumulation 41” means a surface of a portion surrounded by the outline of the concave portion for accumulation 41 when the concave portion for accumulation 41 is viewed in plan. The absorber pattern forming plate 45 is formed of a pair of pattern forming plates 451 and 452. In the manufacturing apparatus 1, the pair of pattern forming plates 451 and 452 are formed in a symmetrical shape with respect to the center line passing through the center in the width direction (X direction) of the concave portion 41 for accumulation. By arranging them symmetrically, a space portion 453 having a shape corresponding to the three-dimensional shape in the accumulation concave portion 41 is formed in the central portion in the drum width direction (X direction). The absorber pattern forming plate 45 is a non-breathable member that does not allow air to pass except for the space portion 453. The pair of pattern forming plates 451 and 452 of the manufacturing apparatus 1 are formed in a rectangular shape that is long in the circumferential direction (2Y direction) of the rotary drum 4a in plan view. A pair of pattern forming plates 451 and 452 is arranged for each of two through holes 432 and 432 adjacent in the circumferential direction 2Y so that the pair of pattern forming plates 451 and 452 are continuous over the entire circumference of the rotating drum 4a. To place. By arranging in this way, the accumulation recess 41 is continuously arranged over the entire circumference of the rotating drum 4a. As the absorber pattern forming plate 45, for example, a plate obtained by machining a metal or resin plate such as stainless steel or aluminum, a plate formed using a mold, or the like can be used.

  In the manufacturing apparatus 1, as shown in FIG. 5, the member 40 forming the outer peripheral surface 4f of the rotating drum 4a is a polymer in which the mesh plate 44 and the absorber pattern forming plate 45 configured as described above are superposed. Are arranged in each through-hole 432 of the frame body 43 and fixed by a known fixing means such as a bolt or an adhesive. The bottom surface of each of the accumulation recesses 41 formed in this way is configured with a mesh plate 44. Then, as shown in FIG. 6, the accumulation recess 41 of the manufacturing apparatus 1 is continuously arranged over the entire circumference of the rotating drum 4a. In the manufacturing apparatus 1, the fine ventilation holes of the porous member constituting the mesh plate 44 pass through the bottom surface of each accumulation recess 41 through the space A in which the accumulation recess 41 is maintained at a negative pressure. It functions as a suction hole.

The manufacturing apparatus 1 includes a pressing belt 7 and a vacuum conveyor 8 in addition to the stacking unit 4 including the defibrating unit 2, the duct 3, and the rotating drum 4 a described above.
In the manufacturing apparatus 1, as shown in FIGS. 2 to 4, the pressing belt 7 is disposed along the outer peripheral surface 4f of the rotating drum 4a adjacent to the downstream side of the position of the duct 3, and the rotating drum 4a. It is arranged along the outer peripheral surface 21 located in the space B set to a negative pressure or zero pressure (atmospheric pressure) weaker than the space A. The presser belt 7 is an endless breathable or non-breathable belt, is stretched over the roll 71 and the roll 72, and is rotated along with the rotation of the rotary drum 4a. In addition, when the pressing belt 7 is a breathable belt, it is preferable that the material in the accumulation recess 41 is not substantially allowed to pass. Even if the pressure in the space B is set to atmospheric pressure, the presser belt 7 can hold the stack 100 a in the stacking recess 41 in the stacking recess 41 until it is transferred onto the vacuum conveyor 8.

  In the manufacturing apparatus 1, as shown in FIGS. 2 and 3, the vacuum conveyor 8 is disposed below the rotating drum 4a, and is set to a weak positive pressure or zero pressure (atmospheric pressure) of the rotating drum 4a. It is arranged on the outer peripheral surface 4f located in the space C. The vacuum conveyor 8 is opposed to the endless breathable belt 83 spanned between the driving roll 81 and the driven rolls 82 and 82, and the outer peripheral surface 4f located in the space C of the rotary drum 4a with the breathable belt 83 interposed therebetween. And a vacuum box 84 disposed at the position. On the vacuum conveyor 8, a core wrap sheet 100 b made of tissue paper or liquid permeable nonwoven fabric is introduced.

  The manufacturing apparatus 1 includes a folding guide plate that folds the core wrap sheet 100b and the stacked fiber body 100a transferred onto the core wrap sheet 100b together in the width direction (X direction) downstream of the vacuum conveyor 8. (Not shown). In the manufacturing apparatus 1, the folding guide plate (not shown) folds the core wrap sheet 100 b and the transferred fiber stack 100 a into two. Further, the manufacturing apparatus 1 includes a cutting device (not shown) on the downstream side of the folding guide plate (not shown), and the individual absorbers 100 are manufactured by the cutting device (not shown). As a cutting device (not shown), for example, those conventionally used for cutting absorbent continuous bodies in the manufacture of absorbent articles such as sanitary napkins, light incontinence pads, panty liners, diapers and the like are not particularly limited. Can be used. Examples of the cutting device (not shown) include a cutter roll provided with a cutting blade on a pair of peripheral surfaces and an anvil roll having a smooth peripheral surface for receiving the cutting blade.

Next, a method for continuously manufacturing the absorber 100 using the manufacturing apparatus 1 described above, that is, an embodiment of the method for manufacturing the absorber of the present invention will be described.
The manufacturing method of the absorbent body 100 of the present embodiment includes a defibrating step of defibrating the pulp sheet 10as formed from the pulp fiber 10a and the synthetic fiber sheet 10bs formed from the synthetic fiber 10b using the defibrator 21; The pulp fiber 10a and the synthetic fiber 10b that have been defibrated are mixed while being conveyed in a scattered state, and are collected in a collecting recess 41. Hereinafter, the manufacturing method of the absorber 100 of this embodiment is explained in full detail.

  First, an intake fan (not shown) connected to the space A in the rotary drum 4a and the vacuum box 84 for the vacuum conveyor is operated to make negative pressure. By creating a negative pressure in the space A, an air flow (vacuum air) is generated in the duct 3 to convey the raw material of the absorber 100 to the outer peripheral surface 4f of the rotary drum 4a. Further, the defibrating machine 21 and the rotating drum 4a are rotated, and the pressing belt 7 and the vacuum conveyor 8 are operated.

  Further, the position of the partition plate 35 in the width direction (X direction) inside the duct 3 is adjusted by the adjusting mechanism of the partition plate 35 of the duct 3, and the cross-sectional areas of the first flow path 30a and the second flow path 30b are adjusted. Adjust the size of.

  Subsequently, the process which reduces the tensile strength of the conveyance direction (Y direction) of the synthetic fiber sheet 10bs formed from the synthetic fiber 10b is given to the pre-process of a defibration process (strength reduction process). In this embodiment, the strength reduction step uses the cutting device 53 to cut the synthetic fiber sheet 10bs to form a cut sheet 10bc formed from a plurality of synthetic fibers 10b, thereby reducing the tensile strength. In the manufacturing apparatus 1 described above, the cutting device 53 is disposed so as to face the plurality of score cut knives 51, 51, 51... In common with the plurality of score cut knives 51, 51, 51. And a receiving roll 52 having a flat peripheral surface. And the direction of the blade of each score cut knife 51 is in the transport direction (Y direction). Since the cutting device 53 having such a plurality of score cut knives 51, 51, 51... Is used, in the present embodiment, the strength decreasing step is a synthetic fiber as shown in FIG. A plurality of cut sheets 10bc extending in the conveyance direction (Y direction) in the conveyance direction (Y direction) of the sheet 10bs are formed.

  The tensile strength in the entire conveying direction (Y direction) of the plurality of cut sheets 10bc formed in this way is such that the synthetic fiber 10b straddling the cut sheets 10bc, 10bc adjacent to each other in the width direction (X direction) is cut. Therefore, it is lower than the tensile strength in the conveyance direction (Y direction) of the synthetic fiber sheet 10bs before cutting, and is a synthetic fiber sheet 10bs1 having a reduced tensile strength. From the viewpoint of reducing the tensile strength in the transport direction (Y direction), the width (length in the X direction) of the cut sheet 10bc is shorter than the average fiber length of the synthetic fibers 10b forming the synthetic fiber sheet 10bs before cutting. It is preferable. In other words, it arrange | positions so that the space | interval of the score cut knives 51 and 51 adjacent in the orthogonal direction (X direction) may become shorter than the average fiber length of the synthetic fiber 10b which forms the synthetic fiber sheet 10bs before cutting. It is preferable. Whether the tensile strength of the synthetic fiber sheet 10bs1 after cutting is lower than the tensile strength of the synthetic fiber sheet 10bs before cutting can be confirmed by the following tensile strength measurement method. An example of a tensile strength measurement method is described below.

<Tensile strength measurement method>
Before and after the strength reduction step, a measurement piece of 200 mm in the transport direction (Y direction) and 50 mm in the width direction (X direction) is cut out, and the measurement piece before the strength reduction step is used as a measurement sample of the synthetic fiber sheet 10bs. Let the measurement piece after a fall process be a measurement sample of synthetic fiber sheet 10bs1. Each measurement sample is pulled in the Y direction at a tensile speed of 100 mm / min and a distance between chucks of 150 mm with a tensile tester (Orientec Co., Ltd. RTC-1150), and the tensile strength in the transport direction (Y direction) is measured. .

  Next, the pulp sheet 10as and the synthetic fiber sheet 10bs1 are defibrated using the defibrating machine 21 (defibrating step). In the manufacturing apparatus 1, the defibrating unit 2 includes a pair of feed rolls 23 and 23 that supply the pulp sheet 10 as to the defibrator 21, and a pair of feed rolls that supplies the synthetic fiber sheet 10 bs 1 having a reduced tensile strength to the defibrator 21. 24 and 24 are provided separately. In the defibrating step of this embodiment, the pulp sheet 10as and the synthetic fiber sheet 10bs1 are separately supplied to the defibrator 21 using separate feed rolls 23 and 24, and defibrated. Preferably, as shown in FIG. 2, the pulp sheet 10as is supplied to the defibrating device 21 via a pair of feed rolls 23, 23, and apart from the pulp sheet 10as, a pair of synthetic fiber sheets 10bs1 with reduced tensile strength are provided. Are supplied to the defibrating machine 21 through the feed rolls 24, 24. The pair of feed rolls 23, 23 controls the supply speed of the pulp sheet 10as to the defibrator 21. Similarly, the pair of feed rolls 24, 24 controls the supply speed of the synthetic fiber sheet 10bs1 to the defibrator 21. The pair of feed rolls 24, 24 are not interlocked with the pair of feed rolls 23, 23, and suitably control the supply speed of the synthetic fiber sheet 10bs1 only to the defibrating machine 21. That is, in the defibrating step, the supply of the pulp sheet 10as and the synthetic fiber sheet 10bs1 to the defibrating machine is independently controlled.

  Specifically, at least one of the pair of feed rolls 24, 24 is configured to be rotated by a driving device (not shown). The pair of feed rolls 24, 24 are nip type rolls. An example of the drive device is a servo motor. From the viewpoint of preventing slippage with the synthetic fiber sheet 10bs1, it is preferable that both the pair of feed rolls 24, 24 are rotated by a driving device. In this case, the pair of feed rolls 24 and 24 may be directly driven by a drive device, or one roll may be driven by the drive device, and the drive may be transmitted to the other roll by a transmission means such as a gear. In addition, from the viewpoint of further preventing slippage with the synthetic fiber sheet 10bs1, the pair of feed rolls 24, 24 may be formed with axial grooves on the entire surface so as to be difficult to slip. In addition to the pair of feed rolls 24, 24, a roll for assisting the conveyance of the synthetic fiber sheet 10bs1 may be provided.

  In this embodiment, the defibrating machine 21 performs the defibrating of two types of sheets, the synthetic fiber sheet 10bs1 and the pulp sheet 10as. As shown in FIG.2 and FIG.4, the synthetic fiber sheet 10bs1 is arranged on one side portion along the conveying direction (Y direction) of the pulp sheet 10as and is separately supplied to the defibrator 21. When the pulp sheet 10as and the synthetic fiber sheet 10bs1 are conveyed in such a state that they are offset toward one side, the blending ratio of the pulp fiber 10a and the synthetic fiber 10b is different in the width direction (X direction) of the defibrator 21. The fiber materials that have been defibrated and defibrated with different blending ratios of the pulp fiber 10a and the synthetic fiber 10b in the width direction (X direction) are supplied from the defibrator 21 to the duct 3. In the present embodiment, the fiber materials having different blending ratios in the width direction (X direction) are the pulp fiber 10a and the synthetic fiber at one end portion (one side portion along the transport direction (Y direction)) in the width direction (X direction). The fibers 10b are formed in a mixed state, and the other end portion in the width direction (X direction) (the other side portion along the transport direction (Y direction)) is formed only from the pulp fibers 10a.

  In the present embodiment, the first flow path 30a and the second flow path 30b adjusted by the partition plate 35 are defibrated with different mixing ratios of the pulp fibers 10a and the synthetic fibers 10b in the width direction (X direction). Fiber material is supplied. Suitably, the fiber material formed only from the pulp fiber 10a is supplied to the 1st flow path 30a of the other end part (other side part along a conveyance direction (Y direction)) of the width direction (X direction). . And the fiber formed in the state by which the pulp fiber 10a and the synthetic fiber 10b were mixed in the 2nd flow path 30b of the one end part (one side part along a conveyance direction (Y direction)) of the width direction (X direction). Material is supplied. Thus, the pulp fibers 10a and the synthetic fibers 10b having different blending ratios in the width direction (X direction) supplied from the defibrating unit 2 by the first flow path 30a and the second flow path 30b adjusted by the partition plate 35. Is conveyed toward the outer peripheral surface 4f of the rotating drum 4a in a state where the blending ratios of the pulp fiber 10a and the synthetic fiber 10b are different in the width direction (X direction). In addition, the polymer spray pipes 36 and 36 arranged on the top plate 31 of the duct 3 are individually adjusted by devices (not shown) such as screw feeders in the first flow path 30a and the second flow path 30b. The supplied amount of absorbent particles 10c is supplied.

  Subsequently, the end on the rotating drum 4a side is continuously extended over the entire circumference of the rotating drum 4a by the partition plate 35 extending to the center line passing through the center in the width direction (X direction) of the accumulation recess 41 provided in the rotating drum 4a. The pulp fibers 10a and the synthetic fibers 10b are accumulated in the width direction (X direction) of the accumulation recess 41 to be performed in a state where the blending ratios are different. As shown in FIG. 7, in the present embodiment, only the pulp fiber 10a is provided on the half surface of the other end portion in the width direction (X direction) (the other side portion along the transport direction (Y direction)) of the accumulation recess 41. The fiber material formed from the above and the absorbent particles 10c are accumulated. Moreover, the fiber formed by mixing the pulp fiber 10a and the synthetic fiber 10b on the half surface of the one end part (one side part along the conveyance direction (Y direction)) of the width direction (X direction) in each concave part 41 for accumulation. The material and the absorbent particles 10c are accumulated.

  As described above, as shown in FIG. 7, the pulp fibers 10 a and the synthetic fibers 10 b are accumulated in the accumulation recess 41 in the width direction (X direction) of the accumulation recess 41 in a state where the blending ratio is different, and rotated. The accumulation is continuously produced over the entire circumference in the circumferential direction (2Y direction) of the drum 4a. Thus, after obtaining the accumulation | aggregation | set in which the pulp fiber 10a and the synthetic fiber 10b accumulated in the recessed part 41 for accumulation | storage, as shown in FIG. 2, the rotating drum 4a is further rotated and it is located in the space B of the rotating drum 4a. The pressed belt 7 disposed on the outer peripheral surface 21 is conveyed to the vacuum conveyor 8 while pressing the accumulated material in the accumulation recess 41.

  As shown in FIGS. 2 and 3, the accumulation in the accumulation recess 41 is accumulated by suction from the vacuum box 84 when it comes to a position opposite to the vacuum box 84 located in the space C of the rotary drum 4 a. The product is released from the concave portion 41 and delivered onto the core wrap sheet 100b introduced onto the vacuum conveyor 8, and the piled body 100a extending continuously in the transport direction (Y direction) is manufactured. Preferably, the piled body 100a is delivered on the other side part along the conveyance direction (Y direction) of the core wrap sheet 100b being conveyed. FIG. 8 shows a cross-sectional view of the stacked fiber body 100a disposed on the core wrap sheet 100b. The stacked fiber body 100a manufactured in this way is stacked in a state where the blending ratios of the pulp fiber 10a and the synthetic fiber 10b are different in the width direction (X direction). In this embodiment, the fiber formed only from the pulp fiber 10a in the half of the other end portion (synonymous with the other side portion along the transport direction (Y direction)) in the width direction (X direction) of the stacked fiber body 100a. The material and the absorbent particles 10c are integrated. Moreover, the fiber material formed by mixing the pulp fiber 10a and the synthetic fiber 10b in the half surface of the one end part (one side part along a conveyance direction (Y direction)) of the width direction (X direction) in the fiber stack 100a. And absorbent particles 10c are collected.

  Next, the piled body 100a is folded together with the core wrap sheet 100b in the width direction (X direction) by a folding guide plate (not shown), and the blending ratios of the pulp fibers 10a and the synthetic fibers 10b are different in the thickness direction (Z direction). Like that. In the present embodiment, the stacked fiber body 100a together with the core wrap sheet 100b is folded in half from one side along the conveying direction (Y direction) by a folding guide plate (not shown), and formed only from the pulp fiber 10a. A band-shaped absorbent body 100 is formed by superimposing an aggregate of fiber material and absorbent particles 10c formed by mixing pulp fibers 10a and synthetic fibers 10b on an aggregate of the formed fiber material and absorbent particles 10c. Manufacturing.

  Thereafter, the band-shaped absorber 100 is cut at a predetermined interval in the transport direction (Y direction) by a cutting device (not shown) to manufacture individual absorbers 100. As shown in FIG. 1, the absorbent body 100 manufactured in this way has a fiber material in which one side (lower side) in the thickness direction (Z direction) is formed only from pulp fibers 10 a and absorbent particles 10 c. It is an aggregate, and the other side (upper side) in the thickness direction (Z direction) is an aggregate of the fiber material formed by mixing the pulp fibers 10a and the synthetic fibers 10b and the absorbent particles 10c. In the thickness direction (Z direction), the blending ratios of the pulp fiber 10a and the synthetic fiber 10b are different.

  As mentioned above, according to the manufacturing method of this embodiment using the manufacturing apparatus 1, the tensile strength of the conveyance direction (Y direction) of the synthetic fiber sheet 10bs formed from the synthetic fiber 10b in the pre-process of a defibration process. Is provided with a strength reduction process for performing processing to reduce the fiber, so that it is easy to unravel when defibrating the synthetic fiber sheet 10bs regardless of the supply speed of the synthetic fiber sheet, and the defibration defect can be suppressed, and the desired mixing ratio The absorber 100 containing the synthetic fiber 10b and the pulp fiber 10a can be manufactured. In particular, even when the supply speed is increased in order to increase the ratio of the synthetic fibers, it is possible to suppress defibration defects. Furthermore, when the manufactured absorbent body 100 includes the synthetic fiber 10b in a state where defibration defects are suppressed, even if the absorbent body 100 absorbs the body fluid, the absorbent body 100 can maintain a rough structure, and the body fluid Can be absorbed at high speed by pinpoint. According to the manufacturing method of this embodiment using the manufacturing apparatus 1, such an absorber 100 can be manufactured efficiently and continuously.

  Moreover, according to the manufacturing method of this embodiment using the manufacturing apparatus 1, the pulp sheet 10as and the synthetic fiber sheet 10bs1 are controlled separately and independently by using separate feed rolls 23 and 24. And defibrated. Therefore, by adjusting the rotation speeds of the feed roll 23 and the feed roll 24, respectively, the supply amount of the pulp sheet 10as supplied to the defibrator 21 via the pair of feed rolls 23, 23, or the pair of feed rolls 24, 24, the supply amount of the synthetic fiber sheet 10bs1 with reduced tensile strength supplied to the defibrator 21 can be adjusted, and the pulp fiber 10a and the synthetic fiber 10b in the absorbent body 100 can be adjusted at a desired ratio.

  Moreover, according to the manufacturing method of this embodiment using the manufacturing apparatus 1, as shown in FIG. 2, a strength reduction process cuts the synthetic fiber sheet 10bs using the cutting apparatus 53, as shown in FIG. A cut sheet 10bc formed from a plurality of synthetic fibers 10b is formed. In particular, in this embodiment, a synthetic fiber sheet is used using a cutting device 53 including a plurality of score cut knives 51, 51, 51... And receiving rolls 52 whose blades are oriented in the transport direction (Y direction). 10bs is cut in the transport direction (Y direction) to form a plurality of cut sheets 10bc extending in the transport direction (Y direction). Since each cut sheet 10b formed in this way extends in the conveyance direction (Y direction), it is easy to supply to the defibrator 21 via the pair of feed rolls 24, 24, and the absorbent body 100 is efficiently manufactured. be able to.

  Moreover, according to the manufacturing method of this embodiment using the manufacturing apparatus 1, the absorber 100 from which the mixture ratios of the fiber materials 10a and 10b differ in the thickness direction (Z direction) is combined with one rotating drum 4a and one set. Therefore, the scale of the equipment can be made compact and the cost of the manufacturing apparatus can be reduced. Moreover, according to the manufacturing method of this embodiment, the absorber 100 from which the blend ratio of the pulp fiber 10a, the synthetic fiber 10b, and the absorptive particle 10c differs in the thickness direction (Z direction) can be manufactured efficiently.

  Moreover, according to the manufacturing method of this embodiment using the manufacturing apparatus 1, since the partition plate 35 of the duct 3 has the adjustment mechanism, the cross-sectional areas of the first flow path 30a and the second flow path 30b are large. The blending ratio of the pulp fiber 10a and the synthetic fiber 10b in the width direction (X direction) can be adjusted. Therefore, the blending ratio of the pulp fibers 10a and the synthetic fibers 10b in the thickness direction (Z direction) of the manufactured absorbent body 100 can be adjusted.

This invention is not restrict | limited to the said embodiment, It can change suitably.
For example, in the accumulation step of the present embodiment, the pulverized pulp fiber 10a and the synthetic fiber 10b are mixed while being conveyed in a scattered state using the duct 3, and are accumulated on the outer peripheral surface 4f of the rotating drum 4a. Although it is accumulated in the concave portion 41, it is only necessary to accumulate in the concave portion for accumulation, and the concave portion for accumulation may not be formed on the outer peripheral surface 4f of the rotating drum 4a.

  In the strength reduction process of this embodiment, the synthetic fiber sheet 10bs is cut in the transport direction (Y direction) using the cutting device 53, and a plurality of cut sheets 10bc extending in parallel with the transport direction (Y direction) are formed. However, it is not limited to this as long as it lowers the tensile strength in the transport direction, and for example, it may be cut in a wave shape in the transport direction (Y direction). Further, the synthetic fiber sheet 10bs is cut in a direction (X direction) orthogonal to the transport direction (Y direction) using another cutting device, and a plurality of cut sheets extending in the orthogonal direction (X direction) are formed. Also good. Further, the cutting device 53 used in the strength reduction process of the present embodiment may be a shear cutting type cutting device that cuts by rubbing the side surfaces of the upper blade and the lower blade, in addition to using a score cut knife, and a laser. It may be a laser device that melts by irradiating light.

  Further, in the strength reduction process of the present embodiment, the synthetic fiber sheet 10bs1 having a reduced tensile strength is formed by using the cutting device 53, but instead of the cutting device 53, as shown in FIG. The surface of the synthetic fiber sheet 10bs of the synthetic fiber 10b may be raised using the convex member 55 having the portion 54 on the surface to form the synthetic fiber sheet 10bs1 having a reduced tensile strength. Preferably, the convex member 55 is a convex roller having a plurality of convex portions 54 provided on the peripheral surface thereof, and rotates when a driving force from a driving means (not shown) is transmitted to the rotating shaft thereof. It has become. And synthetic fiber sheet 10bs is conveyed to convex member 55 which is a convex roller via conveyance rollers 56a and 56b arranged on the upstream side and the downstream side of convex member 55, and synthetic fiber which is a constituent fiber of synthetic fiber sheet 10bs. The synthetic fiber sheet 10bs1 having a reduced tensile strength may be formed by raising the fibers 10b. The rotation direction of the convex member 55 that is a convex roller is preferably rotated in the opposite direction to the conveyance direction (Y direction) of the synthetic fiber sheet 10bs from the viewpoint of efficiently raising the synthetic fiber 10b.

  Further, in the strength reduction process of the present embodiment, instead of the cutting device 53, as shown in FIG. 10, a convex member 58 having a plurality of convex portions 57 with sharp tips on the surface is used, and the synthetic fiber of the synthetic fiber 10b is used. The synthetic fiber sheet 10bs1 having a reduced tensile strength may be formed by opening the sheet 10bs. Preferably, the convex member 58 is a convex roller provided with a plurality of sharp convex portions 57 on the peripheral surface, and rotates when a driving force from a driving means (not shown) is transmitted to its rotating shaft. It is like that. And synthetic fiber sheet 10bs is conveyed to convex member 58 which is a convex roller via conveyance rollers 59a and 59b arranged on the upstream side and downstream side of convex member 58, and an opening is formed on the surface of synthetic fiber sheet 10bs. The synthetic fiber sheet 10bs1 having a reduced tensile strength may be formed by damaging the synthetic fiber 10b as a constituent fiber.

  Moreover, in this embodiment, the synthetic fiber sheet 10bs1 after the strength reduction step is multiplexed by using a folded plate (not shown), which is a pre-step of the defibration step and after the strength reduction step. You may provide the folding process folded up. If such a folding step is provided, the width of the synthetic fiber sheet 10bs1 after the strength reduction step can be reduced, and the amount of supply to the defibrating machine 21 in the downstream defibrating step can be increased to absorb the absorbent body 100. Can be efficiently manufactured. In addition, a folding step of folding and laminating the synthetic fiber sheets 10bs before the strength reduction using a folding plate (not shown) may be provided in the previous step of the strength reduction step. For example, when the synthetic fiber sheet 10bs is cut with respect to the synthetic fiber sheet 10bs by using the cutting device 53, the synthetic fiber in a laminated state that is folded in multiple layers is provided if a folding process is provided in the previous process of the strength reduction process. The sheet 10bs can be supplied to the cutting device 53, and the blending ratio of the synthetic fiber 10b in the manufactured absorbent body 100 can be adjusted.

  Further, in the present embodiment, a plurality of strip-shaped synthetic fiber sheets 10bs are prepared, and a step of laminating the plurality of strip-shaped synthetic fiber sheets 10bs may be provided in the previous step of the strength reduction step. Good. If such a lamination process is provided, for example, when the synthetic fiber sheet 10bs is cut using the cutting device 53 on the synthetic fiber sheet 10bs, the laminated synthetic fiber sheet 10bs can be supplied to the cutting device 53. The blending ratio of the synthetic fiber 10b in the manufactured absorbent body 100 can be adjusted.

  Moreover, in this embodiment, it is a pre-process of a defibration process, and the bundling process which bundles the synthetic fiber sheet 10bs1 after a strength reduction process using a pair of nip rolls in a post process of a strength reduction process. You may have. Moreover, you may provide the converging process which bundles the synthetic fiber sheet 10bs of the synthetic fiber 10b before a previous process of an intensity | strength reduction process using a pair of nip roll in the previous process of an intensity reduction process. If the converging step is provided, for example, when cutting is performed using the cutting device 53, it is easy to supply to the cutting device 53, and the absorber 100 can be manufactured efficiently.

  Moreover, you may change the shape of the fiber stack 100a manufactured flexibly by changing the shape of the recessed part 41 for accumulation. Moreover, you may hydrophilize the fiber used for the synthetic fiber 10b.

  The following manufacturing method of an absorber is indicated further about the embodiment mentioned above.

<1>
A defibrating step of defibrating a strip-shaped pulp sheet formed from pulp fibers and a strip-shaped synthetic fiber sheet formed from synthetic fibers using a defibrator;
A method for producing an absorbent body for absorbent articles comprising pulp fibers and synthetic fibers, wherein the pulp fibers and the synthetic fibers are mixed while being transported in a scattered state and mixed in a collecting recess. Because
The manufacturing method of an absorber provided with the intensity | strength reduction process which performs the process which reduces the tensile strength of the conveyance direction of the said synthetic fiber sheet in the front process of a defibration process.

<2>
In the said defibration process, the manufacturing method of the absorber as described in said <1> performed by controlling the supply of the said pulp sheet and the said synthetic fiber sheet to the said defibrating machine each independently.
<3>
<1> or above, wherein the strength reduction step is to reduce the tensile strength by using a cutting device to cut the synthetic fiber sheet to form a cut sheet formed from a plurality of the synthetic fibers. The manufacturing method of the absorber as described in <2>.
<4>
The manufacturing method of the absorbent body according to <3>, wherein in the strength reduction step, a cutting direction is a conveyance direction of the synthetic fiber sheet, thereby forming a plurality of the cut sheets extending in the conveyance direction.
<5>
The width | variety of the said cut sheet is a manufacturing method of the absorber as described in said <3> or <4> shorter than the average fiber length of the said synthetic fiber which forms the said synthetic fiber sheet before cut.

<6>
The cutting device used in the strength reduction step includes a plurality of score cut knives and a receiving roll having a flat peripheral surface, which is disposed oppositely in common with the plurality of score cut knives. The manufacturing method of the absorber as described in any one of <5>.
<7>
The strength reduction step is a method according to <1> or <2>, wherein the tensile strength is reduced by raising a surface of the synthetic fiber sheet using a convex member having a plurality of convex portions on the surface. Manufacturing method of absorber.
<8>
<1> or <2>, wherein the strength reduction step uses a convex member having a plurality of convex portions with sharp tips on the surface, and reduces the tensile strength by opening the synthetic fiber sheet. The manufacturing method of the absorber as described in any one of.
<9>
The synthetic fiber sheet before the strength reducing step or the synthetic fiber sheet after the strength reducing step is folded in multiple times before the defibrating step and before or after the strength reducing step. The manufacturing method of the absorber of any one of said <1>-<8> provided with the folding process to overlap.
<10>
In any one of the above <1> to <8>, which is a pre-process of the defibrating process and includes a folding process of folding the synthetic fiber sheet in a multiple manner in the pre-process of the strength reduction process The manufacturing method of the absorber of description.
<11>
<1> to <8>, which is a pre-process of the defibrating process, and further includes a folding process of folding the synthetic fiber sheet having a reduced tensile strength in a multiple step after the strength-reducing process. The manufacturing method of the absorber of any one.
<12>
The manufacturing method of the absorber as described in any one of the above items <1> to <8>, comprising a laminating step of laminating a plurality of strip-shaped synthetic fiber sheets in a pre-step of the strength reducing step.

<13>
In the said defibration process, the said pulp sheet and the said synthetic fiber sheet are separately supplied to the said defibrator using a separate feed roll, and are defibrated any one of said <1>-<12> Method for manufacturing the absorber.
<14>
The method for producing an absorbent body according to any one of <1> to <13>, wherein the synthetic fiber sheet and the pulp sheet are defibrated by a single defibrator.
<15>
Any of <1> to <14>, wherein the synthetic fiber sheet is arranged on one side portion along the conveying direction of the pulp sheet, and the pulp sheet and the synthetic fiber sheet are supplied to the defibrating machine. A method for producing the absorber according to claim 1.
<16>
In the collecting step, the pulp fiber and the synthetic fiber defibrated by the defibrator are collected using a rotating drum having the collecting concave part and a device having a duct extending from the defibrator to the rotating drum. The method for producing an absorbent body according to any one of <1> to <15>, wherein the absorbent body is supplied to.

<17>
The said duct has a partition plate, The manufacturing method of the absorber as described in said <16>.
<18>
The said partition plate is a manufacturing method of the absorber as described in said <17> which has an adjustment mechanism.
<19>
The said adjustment mechanism is a manufacturing method of the absorber as described in said <18> which adjusts the position of the width direction of the said partition plate inside the said duct.
<20>
The said adjustment mechanism is a manufacturing method of the absorber as described in said <18> or <19> which adjusts the inclination with respect to the centerline of the width direction of the said partition plate.
<21>
The flow path formed inside the duct is divided into two sections of a first flow path and a second flow path in the width direction by the partition plate,
The method for producing an absorbent body according to any one of <17> to <20>, wherein a polymer spray tube is provided in each of the first flow path and the second flow path.
<22>
The fiber material formed only from pulp fibers is supplied to the first flow path, and the fiber material formed in a state where pulp fibers and synthetic fibers are mixed is supplied to the second flow path. The manufacturing method of the absorber as described in>.

<23>
An absorbent body produced by the method for producing an absorbent body according to any one of <1> to <22>,
Absorption having a laminated structure in which an aggregate of fiber material and absorbent particles formed by mixing synthetic fiber and pulp fiber is superimposed on an aggregate of fiber material and absorbent particles formed from pulp fibers body.

<24>
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. An absorbent article, wherein the body is an absorbent body produced by the method for producing an absorbent body according to any one of <1> to <22>.
<25>
Absorbent article <26> according to the above <24>, wherein the aggregate of the fiber material and the absorbent particles formed by mixing pulp fibers and synthetic fibers is disposed in the upper layer on the skin side.
The absorbent article according to <24> or <25>, which is any one of a disposable diaper, a sanitary napkin, a panty liner, and an incontinence pad

DESCRIPTION OF SYMBOLS 100 Absorbent body 100a Stacked fiber body 10a Pulp fiber 10as Pulp sheet formed from pulp fiber 10b Synthetic fiber 10bs Synthetic fiber sheet formed from synthetic fiber 10bs1 Synthetic fiber sheet with reduced tensile strength 10bc Cut sheet 100b Core wrap sheet 1 Production Device 2 Defibration part 21 Defibration machine 22 Casing 23, 24 Feed roll 4 Accumulation part 3 Duct 30 Flow path 31 Top plate 32 Bottom plate 33, 34 Side wall 35 Partition plate 36 Polymer spray pipe 4a Rotating drum 4f Outer peripheral surface 41 Concave part 42 for accumulation Drum body 5 Strength reduction part 51 Score cut knife 52 Receiving roll 53 Cutting device 54, 57 Convex part 55,58 Convex member 56a, 56b, 59a, 59b Conveyance roll 7 Holding belt 8 Vacuum conveyor 84 Vacuum box 9 Nip Lumpur

Claims (10)

A defibrating step of defibrating a strip-shaped pulp sheet formed from pulp fibers and a strip-shaped synthetic fiber sheet formed from synthetic fibers using a defibrator;
A method for producing an absorbent body for absorbent articles comprising pulp fibers and synthetic fibers, wherein the pulp fibers and the synthetic fibers are mixed while being transported in a scattered state and mixed in a collecting recess. Because
The manufacturing method of an absorber provided with the intensity | strength reduction process which performs the process which reduces the tensile strength of the conveyance direction of the said synthetic fiber sheet in the front process of a defibration process.   The method for producing an absorbent body according to claim 1, wherein in the defibrating step, the pulp sheet and the synthetic fiber sheet are independently supplied to the defibrator.   The strength reduction step uses a cutting device to cut the synthetic fiber sheet to form a cut sheet formed from a plurality of the synthetic fibers, thereby reducing the tensile strength. The manufacturing method of the absorber as described in any one of.   The said strength reduction process is a manufacturing method of the absorber of Claim 3 which forms the cutting direction which is the conveyance direction of the said synthetic fiber sheet, and forms the said cut sheet extended in a conveyance direction by this.   The width | variety of the said cut sheet is a manufacturing method of the absorber of Claim 3 or 4 shorter than the average fiber length of the said synthetic fiber which forms the said synthetic fiber sheet before cut.   The said cutting device used for the said intensity | strength reduction process is equipped with several score cut knives and the receiving roll with which the surrounding surface is flat opposingly arranged in common with these several score cut knives. The manufacturing method of the absorber of any one of these.   The said strength reduction process uses the convex member which has a several convex part on the surface, and raises the tensile strength by raising the surface of the said synthetic fiber sheet, The absorber of Claim 1 or 2 Production method.   3. The strength reduction step according to claim 1, wherein the strength reduction step uses a convex member having a plurality of convex portions with sharp tips on the surface, and reduces the tensile strength by opening the synthetic fiber sheet. Manufacturing method of absorber.   The manufacturing method of the absorber of any one of Claims 1-8 provided with the folding process which folds the said synthetic fiber sheet in multiple steps in the front process of the said defibration process. The manufacturing method of the absorber of any one of Claims 1-8 provided with the lamination process which laminates | stacks a several strip | belt-shaped synthetic fiber sheet in the front process of the said intensity | strength reduction process.

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