JP4785788B2 - Absorber manufacturing method - Google Patents

Description

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

  Absorbent articles such as disposable diapers generally include a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and a liquid-retaining absorbent body disposed between both sheets. As such an absorbent body, a construction in which an absorbent core made of a fiber material such as pulp fiber and a superabsorbent polymer is covered with a core wrap sheet is widely used.

In the manufacture of such an absorbent body, it has a stacking drum in which a plurality of concave portions for accumulation are formed on the outer peripheral surface, and one end portion that covers a part of the outer peripheral surface of the stacking drum, and is in a scattered state. 2. Description of the Related Art A fiber stacking apparatus including a duct that supplies a fiber material and a superabsorbent polymer to the outer peripheral surface of the fiber stacking drum is widely used.
Moreover, as a manufacturing method of an absorbent body using such a stacking apparatus, a core wrap sheet is supplied to the outer peripheral surface of the stacking drum, and the fibers are placed in the accumulation recesses in a state where the sheet is arranged along the inner surface. A method is also known in which after depositing materials and superabsorbent polymers, the deposits are released from the stacking recesses together with the sheet (see, for example, Patent Document 1).

  Patent Document 2 describes that when the absorbent body is manufactured using a fiber stacking apparatus, the supply path of the superabsorbent polymer is branched into two. Not done (see Patent Document 2).

JP-A-10-137286 Japanese Unexamined Patent Publication No. 63-59463

  However, in the conventional method of depositing the fiber material and the superabsorbent polymer on the core wrap sheet, in order to prevent the numerous suction holes provided in the bottom surface of the accumulation recess from frequently clogging. As the core wrap sheet, a thin paper sufficiently finer than the size of the fiber material or superabsorbent polymer particles supplied on the sheet is used, and therefore the thin paper of the obtained absorbent body The surface consisting of has the problem of poor liquid permeability and pullability. Therefore, when incorporating a thin paper into the absorbent article with the skin contact surface facing the skin contact surface side, the second sheet quickly draws liquid from the top sheet onto the thin paper and diffuses the liquid on the thin paper. It was necessary to arrange etc.

  The objective of this invention is providing the manufacturing method of an absorber which can manufacture efficiently the absorber which has the liquid absorption surface excellent in the permeability | transmittance and drawing-in property of a liquid.

  In the present invention, the scattered fiber material and the superabsorbent polymer particles supplied via a duct covering a part of the piled drum on the first core wrap sheet fed on the outer peripheral surface of the piled drum. The absorbent core is formed by depositing by suction, and the surface of the absorbent core opposite to the surface on the first core wrap sheet side is covered with the folded portion of the first core wrap sheet or the second core wrap sheet. To obtain an absorber by cutting the absorber continuum into individual absorber lengths, the superabsorbent polymer being used as the first core wrap. First core wrap before classifying into a large particle having a particle diameter larger than the pore diameter of the sheet and a small particle having a particle diameter smaller than the pore diameter, and moving the large particle to the portion covered with the duct After spraying on the sheet, the first core wrap sheet The object is achieved by providing a manufacturing method of an absorbent body, characterized in that the fiber material and the small-diameter particles are deposited by suction on the sheet by moving to a portion covered with a duct. It is what.

  According to the method for producing an absorbent body of the present invention, a relatively coarse sheet can be used as a sheet on which a fiber material and a superabsorbent polymer as raw materials for the absorbent core are deposited. Since the large particle diameter side with excellent liquid permeability in the distribution is deposited on the surface of a relatively coarse sheet, an absorber having a liquid absorption surface with excellent liquid permeability and pullability is efficient. Can be manufactured well.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
First, an absorbent body manufacturing apparatus 1 that can be preferably used to implement an embodiment of the present invention will be described.
As shown in FIG. 1, the absorbent body manufacturing apparatus 1 covers a stacking drum 2 in which a plurality of accumulation recesses 21 are formed on the outer peripheral surface at a predetermined interval, and a part of the outer peripheral surface of the stacking drum 2. A duct 3 having an end and supplying a raw material (fiber material and superabsorbent polymer) of the absorbent core in a scattered state to the outer peripheral surface of the stacking drum 2 is provided.

  The stacking drum 2 has a cylindrical shape and is rotationally driven in the direction of arrow A in FIG. On the outer peripheral surface of the stacking drum 2, accumulation concave portions 21, 21... Having a shape corresponding to the planar view shape of the absorbent core 40 to be manufactured are formed. An intake fan (not shown) is connected to the stacking drum 2, and the partitioned spaces B and C in the stacking drum are maintained at a negative pressure by driving the intake fan. Yes. A large number of pores (not shown) are formed in the bottom surface portion of each accumulation recess 21, and while the accumulation recess 21 passes over the spaces B and C maintained at a negative pressure, The pores at the bottom of the accumulation recess 21 function as suction holes.

  Near the end of the duct 3 opposite to the stacking drum 2 side, a fiber material supply device (not shown) for supplying the fiber material 4C such as pulp fibers in a scattered state into the duct 3 is provided. Yes. Further, in the duct 3, a polymer introduction port 46 of a polymer introduction device 45 for introducing the superabsorbent polymer 4 </ b> B is arranged in the duct 3 between the fiber drum 2 and the introduction portion of the fiber material. Yes.

  The absorbent body manufacturing apparatus 1 further supplies a first core wrap sheet 5A on the outer peripheral surface of the fiber stack drum 2 before the fiber material 4C and the superabsorbent polymer 4B are deposited in the accumulation recess 21. Core wrap sheet supply mechanism and second core wrap sheet for supplying the second core wrap sheet 5B onto the outer peripheral surface of the stacking drum 2 after the fiber material 4C and the superabsorbent polymer 4B are deposited in the concave portion 21 for accumulation. The supply mechanism and the superabsorbent polymer having a distribution in the particle size are classified into a large particle 4A having a particle diameter larger than the pore diameter of the first core wrap sheet 5A and a small particle 4B having a particle diameter smaller than the pore diameter. Classification is performed by the classifying device 4, the polymer spraying device 41 for spraying the large-sized particles 4 A classified by the classifying device 4 to the first core wrap sheet 5 A before being moved to the portion covered with the duct 3, and the classifying device 4. The small diameter particle 4B is introduced into the duct 3 through the polymer introduction port 46, and the first and second core wrap sheets 5A and 5B before being supplied onto the outer peripheral surface of the fiber drum and the polymer introduction device 45, respectively. Are provided with two adhesive application devices 6A and 6B for applying an adhesive.

As the classifier 4, various known classifiers that can classify the superabsorbent polymer particles can be used. For example, a centrifugal classifier that classifies by centrifugal force, a sieve type classifier that classifies by sieving, or the like can be used. As a centrifugal classifier, for example, a cyclone separator described in JP-A-6-63452 can be used, and as a sieve type classifier, for example, described in Japanese Utility Model Laid-Open No. 5-9683. And a classifier described in Japanese Utility Model Laid-Open No. 7-25976 can be used.
However, the classifier 4 separates into large diameter particles 4A having a particle diameter larger than the pore diameter and small diameter particles 4B having a particle diameter smaller than the pore diameter in relation to the pore diameter of the first core wrap sheet 5A to be used. Adjust the fineness of the screen used for centrifugal force and sieving so that it can be used.

The polymer spraying device 41 is connected to the classifying device 4 via the transfer pipe 42, and after the large-diameter particles 4A discharged from the classifying device 4 are accommodated in an accommodating portion (not shown) inside the polymer dispersing device 41, The accommodated large-diameter particles 4A are configured to be dispersed on the first core wrap sheet 5A at a constant supply amount.
In the present embodiment, the first core wrap sheet 5A is conveyed by the vacuum conveyor 43, and the large-diameter particles 4A are dispersed from the upper surface side of the sheet 5A while being sucked from the lower surface side of the first core wrap sheet 5A. ing. It is preferable that the large-diameter particles 4A be dispersed at least over the entire area of the first core wrap sheet 5A that will be disposed on the accumulation recess 21 later. In this case, the portion disposed on the accumulation recess 21 May be intermittently dispersed, or may be continuously dispersed in the longitudinal direction of the first core wrap sheet 5 </ b> A with a width of a portion disposed so as to overlap with the accumulation recess 21 or a width wider than that. .

The polymer introduction device 45 is connected to the classifying device 4 via the transfer pipe 47, and the small-diameter particles 4B discharged from the classifying device 4 are accommodated in an accommodating portion (not shown) inside and then accommodated in the accommodating portion. The small-diameter particles 4B are introduced into the duct 3 from the polymer introduction port 46 at a constant supply amount.
The spraying and introduction of a constant supply amount by the polymer spraying device 41 and the polymer introducing device 45 can be performed by various known methods, for example, by rotating or stopping a large screw-like member called an auger. Can do. The polymer is introduced by filling the polymer into the hole (gap) of the auger screw and rotating the auger. The amount of polymer supplied is adjusted by the rotational speed of the auger. Further, the set value of the polymer supply amount can be changed by changing the rotational speed of the auger as required.

  The adhesive application device 6A applies an adhesive for adhering the first core wrap sheet 5A and the large-diameter particles 4A of the superabsorbent polymer, but can be said to be related to the large-diameter particles 4A. For example, pattern coating or spray coating is preferable.

  The adhesive coating device 6B applies an adhesive for bonding the second core wrap sheet 5B, the first core wrap sheet 5A, and the absorbent core 40, but on the first core wrap sheet. In terms of the relationship with the formed absorbent core 40, coater, spray, spiral, and pattern coating are preferable.

  Examples of the coating mode of the adhesive by the adhesive coating apparatuses 6A and 6B include solid coating, spray coating, spiral, stripe, and dot pattern coating, and the like, which are incorporated in absorbent articles such as disposable diapers. Sometimes, the coating pattern of the core wrap sheet disposed on the skin side is preferably a pattern coating such as spiral, stripe, or dot so as not to impair the absorption performance. Various adhesives conventionally used for manufacturing absorbent articles such as disposable diapers can be used without particular limitation, and a hot melt adhesive is preferable.

Next, a method for manufacturing an absorbent body having a structure in which an absorbent core made of a fiber material and a superabsorbent polymer is covered with the first and second core wrap sheets using the absorbent body manufacturing apparatus 1 described above, One embodiment of the method for producing an absorbent body of the present invention will be described.
In this embodiment, in order to manufacture an absorbent body using the above-described absorbent body manufacturing apparatus 1, first, the fiber stacking drum 2 is rotated, the intake fan is operated, and the first and second core wraps are further operated. The sheet supply mechanism, the classification device 4, and the adhesive coating devices 6A and 6B are operated.
By the operation of the intake fan, a suction force is generated at the bottom surface portion of the accumulation recess 20 located on the space B, and an air flow that flows toward the outer peripheral surface of the stacking drum 2 is generated in the duct 3.

And while supplying the superabsorbent polymer which has a distribution in a particle size to the classification apparatus 4, if the polymer spraying apparatus 41, the polymer introduction apparatus 45, and a fiber material supply apparatus are operated, the high absorption supplied to the classification apparatus 4 will be carried out. The functional polymer is classified into large diameter particles 4A having a particle diameter larger than the pore diameter of the first core wrap sheet 5A and small diameter particles 4B having a particle diameter smaller than the pore diameter.
The classified large-diameter particles 4A are transferred to the polymer spraying device 41 via the transfer pipe 42, and sprayed onto the first core wrap sheet 5A by the polymer spraying device 41.

The first core wrap sheet 5A after the large-diameter particles 4A are dispersed is supplied onto the outer peripheral surface of the stacking drum 2 by a first core wrap sheet supply mechanism including a part of the vacuum conveyor 43, a guide roll, and the like. Further, as the stacking drum 2 rotates, it moves to a portion covered with the duct 3.
Then, the fiber material 4C and the small-diameter particles 4B that have been transported by being placed in the air flow in the duct 3 are moreover on the first core wrap sheet 5A located in the accumulation recess 21 in the portion covered with the duct 3. Specifically, the large diameter particles 4A in the sheet 5A are sucked and deposited on the surface on which the large diameter particles 4A are dispersed.

By the accumulation of the small-diameter particles 4B and the fiber material 4C, the absorbent core 40 composed of the large-diameter particles 4A, the small-diameter particles 4B, and the fiber material 4C is formed in each accumulation recess 21.
Then, the first core sheet 5A in which the absorbent core 40 is formed on one side moves to the outside of the portion covered with the duct 3 as the stacking drum 2 rotates, and immediately after that the first core The second core wrap sheet 5B is supplied and laminated by the second core wrap sheet supply mechanism on the surface side of the core wrap sheet 5A where the absorbent core 40 is formed.
In this way, an absorbent continuous body 10A having a configuration in which the absorbent core 40 composed of the large diameter particles 4A, the small diameter particles 4B, and the fiber material 4C is disposed between the first and second core wrap sheets 5A and 5B is obtained. It is done.

And the absorber continuous body 10A moves to the space D, which is set to a positive pressure in the fiber drum, and is separated from the outer peripheral surface of the fiber drum by the wind pressure applied from the back surface in the space D. To a conveying means (not shown) such as a belt conveyor.
The absorbent continuous body 10A conveyed to the next step is made into a single state or a state incorporated in the continuous diaper, and then cut into a length corresponding to one diaper to form individual absorbent bodies 1.

In the present embodiment, since the large diameter particles 4A larger than the pore diameter are dispersed on the first core wrap sheet 5A, the small diameter particles 4B and the fiber material 4C are deposited on the sheet 5A. Small-diameter particles 4B having a diameter smaller than the pore diameter of the sheet 5A can be reliably captured and deposited on the sheet 5A.
Therefore, the suction hole of the piled drum 2 is less likely to be clogged by the superabsorbent polymer and the fiber material that have passed through the first core wrap sheet 5A, and the cleaning frequency of the piled drum 2 and the waste of the superabsorbent polymer, etc. are wasted. Can be greatly reduced.

  In addition, by dispersing the large-diameter particles 4A in advance, when the small-diameter particles 4B and the fiber material 4C are sucked and deposited, or after the absorbent core continuous body 10A or the absorbent body 10 is formed, the first core wrap sheet 5A. Since it is possible to prevent the small-diameter particles 4B and the fiber material 4C from leaking out from the side, the first core wrap sheet 5A having a larger pore diameter than that conventionally used can be used.

When the first core wrap sheet 5A having a large pore diameter is used, when the obtained absorbent body 10 is used in the absorbent article 100 with the surface on the sheet 5A side facing the skin contact surface side, the sheet 5A This improves the liquid permeability and pull-in performance of the surface.
FIG. 2 shows the absorbent body 10 obtained by the above-described manufacturing method as an absorbent article such as a disposable diaper or a sanitary napkin, with the surface on the first core wrap sheet 5A side forming a skin contact surface. It is a schematic cross section which shows the assembled state.
In the absorbent article shown in FIG. 2, in the thickness direction of the absorbent core 40, a layer having a large content ratio of the large diameter particles 4A is formed on the first core wrap sheet 5A side, and a small diameter is formed on the second core wrap sheet 5B side. A layer having a high content ratio of the particles 4B and the fiber material 4C is formed.

The first core wrap sheet has an average pore diameter from the viewpoint of forming a liquid-receiving surface with good liquid permeability and drawability, and preventing leakage of the polymer during production or use of absorbent articles. However, it is preferable to use 250-2000 μm, more preferably 300-1000 μm, particularly preferably 500-800 μm.
Here, the average pore diameter of the core wrap sheet is measured as follows.
[Measurement method of average pore diameter of first core wrap sheet]
It can be measured by the bubble point method in accordance with JIS K3832 “Bubble point test method for microfiltration membrane elements and modules”. As a measuring instrument used for the measurement, for example, a palm porometer (Perm-Porometer, model CPP-120AEXL-ESA, Seika Sangyo Co., Ltd.) can be mentioned. Use distilled water, ion-exchanged water or equivalent water as the test solution.
An average pore diameter can also be measured based on ASTMF316-86.

Further, the superabsorbent polymer used for classification is from the point of preventing passing through the eyes of the first core wrap sheet 5A, and from the point of scattering from the sheet, in relation to the pore diameter of the first core wrap sheet 5A, It is preferable to have the following particle size distribution.
A superabsorbent polymer having a distribution of the superabsorbent polymer of 10% or more and less than 50% in the region beyond the peak of the pore size distribution of the first core wrap sheet 5A is preferable.

Further, the classification by the classifier is a ratio of the polymer mainly composed of the large-diameter particles 4A transferred to the polymer spraying device 41 and the polymer mainly composed of the small-diameter particles 4B transferred to the polymer introduction device 45 (the former: the latter , Weight ratio) is preferably 1: 9 to 5: 5.
Moreover, the ratio (the former: latter, weight ratio) of the total superabsorbent polymer and the fiber material in the absorbent core 40 is appropriately determined according to the specific use of the absorber, the average physical properties of the superabsorbent polymer, and the like. For example, 4: 6 to 9: 1.

As the first core wrap sheet 5A, various sheet materials conventionally used as a constituent material of absorbent articles such as disposable diapers can be used, and paper such as tissue paper can be used, but non-woven fabric is used. It is preferable.
Nonwoven fabrics produced by various production methods can be used without particular limitation as the nonwoven fabric, such as spunbond nonwoven fabric, needle punched nonwoven fabric, spunlace nonwoven fabric, air-through nonwoven fabric, spunbond-meltblown-spunbond nonwoven fabric (SMS), and spunbond-meltblown. -Melt blown-Spunbond nonwoven fabric (SMMS) etc. are mentioned. Among these, from the viewpoint of softness and the like, it is preferable to use an air-through nonwoven fabric, a spunbond-meltblown-spunbond nonwoven fabric (SMS), or a multilayer nonwoven fabric in which the uppermost layer is made of such a nonwoven fabric.

When a nonwoven fabric is used for the first core wrap sheet, when the obtained absorbent body is used for an absorbent article with the sheet side surface facing the skin contact surface side, the surface of the sheet is not touched. The sheet can also function as a conventional surface sheet. That is, the surface made of the first core wrap sheet 5A can also be used as the skin contact surface of the absorbent article as shown in FIG.
The nonwoven fabric used for the first core wrap sheet is preferably composed of fibers made of a thermoplastic polymer material such as polyolefin such as polyethylene or polypropylene, polyester such as polyethylene terephthalate, polyamide such as nylon (registered trademark), These fibers may be a core-sheath type or a side-by-side type composite fiber.

Further, as shown in FIG. 3, the first core wrap sheet 5 </ b> A has a laminated upper fiber layer 51 and lower fiber layer 52, and the upper fiber layer 51 and the lower fiber layer 52 are partially joined. It is also preferable to use a three-dimensional sheet 50 in which a large number of bonding portions 53 are formed and a large number of convex portions 54 are formed by portions other than the bonding portions 53 of the upper fiber layer 51.
When the three-dimensional sheet 50 is supplied onto the outer peripheral surface of the stacking drum 2, the upper fiber layer 51 side is supplied toward the axial core side of the stacking drum 2, and the lower fiber layer of the three-dimensional sheet 50 is supplied. The absorbent core 40 is formed on the 52 side.

  As shown in FIG. 3, the three-dimensional sheet 50 has a structure in which an upper fiber layer 51 and a lower fiber layer 52 are laminated. In the three-dimensional sheet 50, the upper fiber layer 51 and the lower fiber layer 52 are partially bonded to form a large number of bonding portions 53, and the convex portions 54 are formed by the upper fiber layer 51 other than the bonding portions 53. Is formed. The inside of the convex portion 54 may be filled with the constituent fibers of the upper fiber layer 51, but a cavity is formed between the upper fiber layer 51 having a convex curved surface shape and the flat lower fiber layer 52. It is preferable.

  Since the three-dimensional sheet 50 is formed with a large number of convex portions 54, the contact area between the wearer's skin and the three-dimensional sheet 50 is reduced, reducing stickiness when the absorbent article is worn, Can be improved.

The shape of the convex portion 54 in the three-dimensional sheet 50 is not particularly limited, and may be, for example, a hemispherical shape, a rectangular parallelepiped shape, a mounting cone shape, or a mounting quadrangular pyramid shape. Moreover, it is preferable that the height of the convex part 54 is 0.2-5 mm, More preferably, it is 0.5-1 mm. The number of protrusions 54 per unit area is preferably 5 to 15 pieces / cm ² , more preferably 8 to 12 pieces / cm ² .

As the upper fiber layer 51 and the lower fiber layer 52, a non-woven fabric or a non-woven fabric web can be used. As the nonwoven fabric, nonwoven fabrics produced by various production methods can be used without particular limitation, and various nonwoven fabrics such as nonwoven fabrics produced by the card method, air-through nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics and needle punched nonwoven fabrics can be used. Can be used. The lower fiber layer preferably includes 60 to 100% by weight, particularly 70 to 100% by weight, of the latent crimpable fiber that has been crimped by heat treatment, and the upper fiber layer includes the crimp of the latent crimpable fiber. Preferably it comprises 60 to 100% by weight, in particular 70 to 100% by weight, of fibers that do not substantially shrink at the starting temperature.
As the three-dimensional sheet 50, for example, a surface sheet described in JP-A No. 2004-174234 can be used.

As the second core wrap sheet 5B, paper, non-woven fabric, or the like can be used. As the non-woven fabric, those described above as the material of the second core wrap sheet can also be used.
However, as the second core wrap sheet 5B, the first core wrap sheet 5A is used from the viewpoint of preventing the leakage of the small-diameter particles 4B and the fiber material 4C from the sheet 5B side during the manufacture of the absorbent body and the state of the absorbent article. It is preferable to use a sheet having a smaller pore diameter.

Other materials used in this embodiment will be described.
As the fiber material 4C, a material that can be conveyed in an air flow in the duct can be used without particular limitation, and short fibers are preferable. As the fiber material 4C, short fibers of cellulose fibers such as pulp fibers, rayon fibers, and cotton fibers, short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate are preferable. These fibers may be used alone or in combination of two or more. The fiber material preferably contains pulp fibers, and the proportion of pulp fibers in the fiber material is preferably 20 to 100% by mass, more preferably 80 to 100% by mass, and still more preferably 100% by mass. is there.

As the superabsorbent polymer, various polymers conventionally used in absorbent articles for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. For example, starch-based, cellulose-based, synthetic polymers The one of the system is mentioned. 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.
In addition, the large diameter particles 4A and the small diameter particles 4B may be formed of the same or different materials.

As mentioned above, although one Embodiment of the absorber of this invention was described, this invention is not restrict | limited to the said embodiment, It can change suitably.
For example, as for the method of covering the absorbent core 4 with the core wrap sheet, as the first and second core wrap sheets 5A and 5B, a sheet wider than the width of the absorbent core 4 is used. The portions extending from both side edges of the absorbent core 4 in the two sheets arranged on the upper and lower surfaces may be joined on the side of the absorbent core 4, or the first and second core wrap sheets 5A, 5B, two sheets having different widths are used, and the portions extending from both side edges of the absorbent core 4 in one of the two sheets disposed on the upper and lower surfaces of the absorbent core 40 are folded back to the other. The absorbent core 4 may be bonded to the sheet, and further, the absorbent core 4 is formed in the center in the width direction of the first core wrap sheet having a width that is twice or more the width of the absorbent core 4, The portions extending from both side edges of the absorbent core 4 are Respectively, they may be joined by folding back the other side of the absorbent core 4.

Moreover, the planar view shape of the recessed part 21 (absorbent core 4) for accumulation | storage can be made into arbitrary shapes, such as a rectangle, an ellipse, an hourglass shape, and a gourd shape. Further, the stacking drum 21 may be formed with an accumulation recess 21 that is continuous in the circumferential direction, and an absorbent continuous body that includes an absorbent core that is continuous in the longitudinal direction.
Moreover, you may perform dispersion | distribution of 4A of large diameter particles, without attracting | sucking from the back surface of a 1st core wrap sheet | seat.

  The absorbent body produced in the present invention is preferably used as an absorbent body for absorbent articles. The absorbent article is mainly used for absorbing and holding excretory body fluids such as urine and menstrual blood. Absorbent articles include, for example, disposable diapers, sanitary napkins, incontinence pads, and the like, but are not limited to these, and widely include articles used to absorb liquid discharged from the human body.

The absorbent article typically includes a top sheet, a back sheet, and a liquid-retaining absorbent disposed between the two sheets. The absorbent manufactured in the present invention is a first core wrap. The sheet can also serve as a surface sheet, and when the absorbent article is manufactured, all or part of the nonwoven fabric used as the surface sheet can be eliminated.
As the back sheet, materials usually used in the technical field can be used without particular limitation.
As the back sheet, a liquid-permeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet may 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 disposed on the outer side of both side portions where the absorbent body stands.

It is a schematic diagram which shows one embodiment of this invention and the manufacturing apparatus of the absorber used for it. It is a schematic cross section which shows the state which incorporated the absorber manufactured by the method or apparatus shown in FIG. 1 in the absorbent article. It is a schematic cross section which shows the example of the solid sheet preferably used as a 1st core wrap sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent body manufacturing apparatus 2 Filament drum 3 Duct 4 Classifier 4A Large particle 4B Small particle 4C Fiber material 5A First core wrap sheet 5B Second core wrap sheet 6A, 6B Adhesive coating apparatus 10A Absorber continuous Body 10 Absorbent body 40 Absorbent core 30 Leak-proof sheet 100 Absorbent article

Claims (3)

On the first core wrap sheet supplied on the outer peripheral surface of the stacking drum, the scattered fiber material and the superabsorbent polymer particles supplied through a duct covering a part of the stacking drum are deposited by suction. The absorbent core is formed by covering the surface opposite to the first core wrap sheet side of the absorbent core with the folded portion of the first core wrap sheet or the second core wrap sheet. A method for producing an absorbent body, wherein a continuous body is obtained, and then the absorbent body continuum is cut into individual absorbent body lengths to obtain the absorbent body,
The superabsorbent polymer was classified into a large particle having a particle diameter larger than the pore diameter of the first core wrap sheet and a small particle having a particle diameter smaller than the pore diameter, and the large particle was covered with the duct. After spraying on the first core wrap sheet before being moved to the part, the first core wrap sheet is moved to the part covered with the duct, and in the part, the fiber material and the small diameter particles are placed on the sheet. A method for producing an absorber, characterized by depositing by suction.   The first core wrap sheet has a laminated upper fiber layer and lower fiber layer, and the upper fiber layer and the lower fiber layer are partially joined to form a large number of joints. Using a three-dimensional sheet in which a large number of convex portions are formed by portions other than the joint portion, the three-dimensional sheet on the outer peripheral surface of the stacking drum, and the axis of the stacking drum on the upper fiber layer side The manufacturing method of the absorber of Claim 1 supplied toward the side.   The manufacturing method of the absorber of Claim 1 or 2 whose average pore diameter of a 1st core wrap sheet | seat is 250-2000 micrometers.

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