JP3880132B2 - Absorber for absorbent article and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent body for absorbent articles such as a (disposable) diaper, a sanitary napkin, an incontinence pad, etc., which has high absorption performance and does not deteriorate due to use.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, as an absorbent body for absorbent articles such as sanitary napkins, a first absorbent paper, an absorbent layer placed on the first absorbent paper, and an upper surface and a side surface of the absorbent layer are disposed. A substantially longitudinal absorbent body is used.
In recent years, since the absorbent body is required to have higher absorption performance, it has been proposed to give a three-dimensional shape to the absorbent body to improve the fit and to increase the absorbent capacity.
As such proposals, (1) a proposal for providing a three-dimensional shape by folding (Japanese Patent Publication No. 8-24677), and (2) a proposal for forming a three-dimensional shape by making the absorbent body into a laminate of fibers (Japanese Patent Laid-Open No. Hei. No. 5-115503) and (3) Proposal of providing a three-dimensional napkin by providing two or more absorbers (Japanese Patent Laid-Open No. 5-115506).
[0003]
However, the absorber according to the above proposal cannot yet satisfy the required absorption performance, and further development of an absorber having high absorption performance is desired.
That is, since the absorbent body according to the proposal (1) is simply a folded shape, the absorbent capacity of the absorbent body itself is not improved, and the three-dimensional shape is reduced by use. There is a problem that the fitting property due to the three-dimensional shape is lowered. In addition, since the absorbent body according to the proposal (2) is simply laminated with pulp, the three-dimensional shape is reduced by use, the fitting property due to the three-dimensional shape is reduced, and the absorption capacity is improved. There is a problem of disappearing. Further, the absorbent body according to the proposal (3) has a problem that since there is a gap between the absorbent bodies, the absorbent bodies are displaced during use, and the fit property is lowered and the absorbent property is also lowered.
[0004]
Therefore, the object of the present invention is excellent in fit and absorbency, does not fall off even during use, and does not deteriorate absorption performance due to use (disposable) diapers, sanitary napkins, incontinence pads, etc. Another object of the present invention is to provide an absorbent body for an absorbent article.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have found that an absorbent body in which the absorption layer has a laminated structure of two layers and a superabsorbent polymer layer is provided between each layer can achieve the above object. I found out.
[0006]
The present invention has been made based on the above knowledge, and is an absorber comprising a lower absorbent layer and an upper absorbent layer laminated on the lower absorbent layer, the lower absorbent layer and the upper absorbent layer. Is connected at one side edge in the longitudinal direction of both of them, and is laminated by folding the one side edge as a bent portion, and highly absorbing between the lower absorbent layer and the upper absorbent layer. and sexual polymer layer is interposed, the upper absorbent layer may have a three-dimensional section with a predetermined shape comprising a central solid portion and the peripheral solid portion separated by the groove provided continuously, the surface of the lower absorbent layer In addition, the present invention provides an absorbent body for absorbent articles, wherein a groove having the same shape as the groove of the upper absorbent layer is formed .
[0007]
Further, the present invention includes a lower absorbent layer and an upper absorbent layer laminated on the lower absorbent layer, and the lower absorbent layer and the upper absorbent layer are connected at one side edge in the longitudinal direction of both. And an absorbent for an absorbent article in which the one side edge is folded and laminated so that a superabsorbent polymer layer is interposed between the lower absorbent layer and the upper absorbent layer. a method of manufacturing a body, an absorbent layer continuous body forming step of forming a continuous body of the absorbent layer with fiber stacking the fibers on the first absorbent sheet of the continuum, on a continuum of the upper Ki吸 Osamuso, a superabsorbent polymer layer forming step of forming the superabsorbent polymer layer superabsorbent polymer is spread into a predetermined shape at predetermined intervals, the second absorbent paper to the superabsorbent polymer layer is formed surface with placing the continuum, the superabsorbent polymer in the continuum of the upper Ki吸 Osamuso A portion that is not scatter, the tongue shape of the upper absorbent layer having the same shape, the tongue forming a tongue by cutting completely, leaving one side, the drum body and outward from the outer surface thereof An extruding drum provided with an extruding member that is extruded toward the surface, and the extruding member extrudes the tongue piece toward the surface on which the superabsorbent polymer layer is provided. said one side of the folded over to the superabsorbent polymer layer side as the bent portion, and folding the heavy step of forming the upper absorption layer and the lower absorption layer, the continuum at a point forming the tongue towards the width direction, there is provided a method for manufacturing an absorbent body for an absorbent article which is characterized by comprising a continuous body cut to obtain individual said absorbent body by cutting the continuum.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the absorbent body for an absorbent article of the present invention will be described in more detail with reference to the drawings.
Here, FIG. 1 is a plan view showing an embodiment of the absorbent body for an absorbent article of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a schematic view showing an outline of a preferred production method of the absorbent body of the present invention, FIG. 4 is a view taken along arrow IV in FIG. 3, and FIG. 5 is a view taken along arrow V in FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5, and FIG. 7 is a cross-sectional view in the width direction showing the inside of the drum used for folding the absorbent layer shown in FIG. 3 and the folded form of the absorbent layer. . FIG. 8 is a plan view showing a part of a press device used when a three-dimensional shape is imparted to the absorber, and FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG.
[0009]
As shown in FIGS. 1 and 2, the absorbent body 1 for an absorbent article according to the present embodiment includes a lower absorbent layer 10 and an upper absorbent layer 20 placed on the lower absorbent layer 10.
[0010]
As a material for forming the upper and lower absorbent layers 20 and 10, pulp fibers used for a normal absorbent body are used without any particular limitation.
[0011]
Thus, in the absorbent body 1 of the present embodiment, the lower absorbent layer 10 and the upper absorbent layer 20 are connected at the one side edge 1a in the longitudinal direction of the both, and the one side edge 1a is bent at the bent portion. The superabsorbent polymer layer 30 is interposed between the lower absorbent layer 10 and the upper absorbent layer 20.
[0012]
More specifically, the upper absorbent layer 20 has a shape such that one end of a rectangular parallelepiped is tapered and the other end is arcuate, and the lower absorbent layer 10 has a longitudinal direction. The central part has a constricted shape.
The basis weight of the upper absorbent layer 20 and the basis weight of the lower absorbent layer 10 are substantially the same. Specifically, the basis weight is preferably 250 to 400 g / m ² , and the thickness is 3 to 5 mm. Is preferred.
[0013]
As shown in FIG. 1, the superabsorbent polymer layer 30 has a rectangular shape and is provided at the center in the width direction of the upper absorbent layer 20 and the lower absorbent layer 10.
The basis weight of the superabsorbent polymer layer 30 is preferably 10 to 40 g / m ² .
[0014]
The upper absorbent layer 20 and the lower absorbent layer 10 are connected at one side edge 1 a that is a side edge of the absorber 1. The upper absorbent layer 20 is folded on the lower absorbent layer 10 so as to sandwich the superabsorbent polymer layer 30 with the connected one side edge 1a as a bent portion 40.
[0015]
A first absorbent paper 51 is disposed so as to cover the back surface side of the lower absorbent layer 10 (the surface opposite to the surface where the upper absorbent layer is located) and the surface of the upper absorbent layer 20. In addition, as shown in FIG. 2, two second absorbent papers 52 are arranged so as to be sandwiched between the lower absorbent layer 10 and the upper absorbent layer 20. The two second absorbent papers 52 and 52 have the same shape (planar shape) as the upper absorbent layer 20 and the upper lower absorbent layer 10, respectively. The second absorbent paper 52 is composed of the lower absorbent layer 10. It is arranged so as to cover the entire surface. The first absorbent paper 51 is folded over the second absorbent paper 52 at the upper and lower ends on the surface side of the lower absorbent layer.
[0016]
The absorber is provided with a three-dimensional part 60 having a predetermined shape. The three-dimensional part 60 is formed by pressing the upper absorbent layer 20 side. Specifically, the three-dimensional part 60 includes a central three-dimensional part 62 and a peripheral three-dimensional part 63 which are separated by a groove 61 provided continuously. The central three-dimensional part 62 is formed so that one end is sharp and the other end is curved, and the side edge part is also curved so that its substantially central part is convex. A groove 64 having the same shape as the groove 61 is also formed on the surface of the lower absorption layer 10.
As the material constituting the absorber such as the superabsorbent polymer, the first absorbent paper, and the second absorbent paper, those used for the absorbent body of an absorbent article are usually used without particular limitation. Examples of the material for forming the second absorbent paper include paper and nonwoven fabric made of various natural or synthetic fibers.
[0017]
Since the absorbent body of the present embodiment is configured as described above, it has excellent fit and absorbency, does not slip even during use, and does not deteriorate the absorption performance due to use. In particular, since the superabsorbent polymer layer 30 is sandwiched between the upper absorbent layer 20 and the lower absorbent layer 10, the superabsorbent polymer is not spilled and the absorbent performance is not deteriorated during use.
[0018]
Subsequently, the preferable manufacturing method of the absorber of this form is demonstrated.
The absorbent body for an absorbent article of this embodiment can be produced as follows.
That is, as shown in FIG. 3, the absorbent body of this embodiment is an absorbent layer continuous body forming step A in which fibers are stacked on the first absorbent paper continuous body 51 ′ to form an absorbent layer continuous body 10 ′. And a superabsorbent polymer layer forming step B in which the superabsorbent polymer layer 30 is formed by dispersing the superabsorbent polymer in a predetermined shape at a predetermined interval on the continuum 10 ′ of the absorbent layer, Place the second absorbent paper continuum 52 ′ on the surface on which the superabsorbent polymer layer 30 is formed, and place the superabsorbent polymer in the absorbent layer continuum 10 ′ where the superabsorbent polymer is not dispersed, A tongue piece forming step C in which a tongue piece 20 ′ is formed by cutting out into a predetermined tongue piece shape, and the upper absorbent layer 20 and the lower absorbent layer 10 are formed by folding the tongue piece 20 ′ on the superabsorbent polymer layer 30. And the continuum 1 at the place where the tongue piece 20 'is formed. 'Toward the width direction of the web 10' by performing a continuum cutting step E of cutting the obtain individual absorbent body 1 can be manufactured.
[0019]
More specifically, the absorbent layer continuum forming step is performed as follows.
That is, the first absorbent paper continuum 50 ′ is unwound from a raw roll (not shown) and introduced into the fiber stacking apparatus 110 as shown in FIG. 3. Then, in the fiber stacking apparatus 110, as shown in FIG. 3, the fibers are stacked on the first absorbent paper continuum 50 ′ to form the absorbent layer continuum 10 ′. Then, after the shape is adjusted by the press roll 114, it is further transferred by the transfer roll 120.
Here, the fiber stacking device 110 includes a fiber dropping unit 111 that drops and deposits fibers downward, a dispersion drum 112 that uniformly disperses the fibers dropped from the fiber dropping unit 111, and a dispersion of fibers. And a chamber 113 for depositing on the first absorbent paper continuum 50 '.
[0020]
In the superabsorbent polymer layer forming step B, water is sprayed onto the continuum 10 ′ of the absorbent layer by a known water spraying device 130 to wet the absorbent layer, and then a predetermined polymer spraying device 140 is used to perform a predetermined process. The superabsorbent polymer layer 30 is formed by spraying the superabsorbent polymer in a rectangular shape (predetermined shape) at intervals (as shown in FIG. 4).
[0021]
In the tongue piece forming step C, first, as shown in FIG. 3, a continuous body 52 of the second absorbent paper is formed on the surface of the continuous body 10 ′ on which the superabsorbent polymer is dispersed, on which the superabsorbent polymer layer 30 is formed. Put '. Next, as shown in FIG. 4, it is introduced into the roll cutter 150, and the portion where the superabsorbent polymer is not dispersed in the continuum 10 ′ of the absorbent layer is cut without cutting the continuum 10 ′. The tongue piece 20 ′ having the same shape as the upper absorbent layer 20 described above is formed. Here, the tongue piece 20 ′ is completely cut (both the first and second absorbent papers and the absorbent layer) except for one side 20a ′, and the one side 20a ′ is also cut into the absorbent layer. Cut to half the thickness of 10 '. Further, the cut of the one side 20a ′ is made from the second absorbent paper side, whereby the second absorbent paper is divided into two sheets.
[0022]
In the folding step D, as shown in FIG. 3, the continuous body 10 ′ on which the tongue piece 20 ′ is formed is introduced into the extrusion drum 160, and the tongue piece 20 ′ is introduced into the superabsorbent polymer layer 30. Extrude to the surface side where is provided. 5 and 6, the tongue piece 20 ′ is folded on the superabsorbent polymer layer 30 to form the upper absorbent layer 20 and the lower absorbent layer 10, and the upper absorbent layer 20 and the The superabsorbent polymer layer 30 is sandwiched between the lower absorbent layer 10.
Here, the structure of the extrusion drum 160 will be described. As shown in FIG. 7, the extrusion drum 160 includes a cylindrical drum body 161, an eccentric shaft 162 provided at the center of the drum body 161, and a spring. The four pushing members 163 urged toward the center in the axial direction by the member 164 are provided, and the pushing member 163 has a bearing portion 165 having a rotatable caster portion 166 at the tip. The pushing drum 160 has the pushing member 163 directed axially outward from the outer surface of the drum body 161 due to the difference in the diameter of the eccentric shaft 162 when the drum body 161 rotates in the direction of the arrow. It is made to be pushed out.
Then, in this step D, as shown in FIG. 3, both sides in the width direction of the first absorbent paper continuous body 51 ′ are folded back by the folding guide 151 and then pushed out by the pushing drum 160 operating as described above. After the tongue piece 20 'is urged in the direction of the arrow by the guide bar 170 and folded on the superabsorbent polymer layer 30, it is further introduced into the conveyor 180 so that the tongue piece 20' It is pressed on the absorbent polymer layer 30 to prepare a folded form. Although not particularly performed in this embodiment, it is preferable to lightly form the sheet after folding it using a press roll or the like in order to maintain a more bent shape.
[0023]
In the continuum cutting step E, the continuum is cut at a portion indicated by an alternate long and short dash line in FIG. 5 located at a substantially central portion of a portion where the tongue piece 20 ′ is cut out at a place where the tongue piece 20 ′ is formed. This is done by cutting in the width direction using the cutting device 181. The cutting device 81 can be performed without any particular limitation using a device used for cutting a normal web or the like.
[0024]
Moreover, in the manufacturing method of this form, after the said continuous body cutting process, the said upper absorption layer is further pressed, and the solid part formation process F which has the solid part formation which forms the solid part of a predetermined shape is performed. .
The solid part forming step F includes a concave part 191 formed in a predetermined shape as shown in FIGS. 8 and 9, and a wall-like convex part 192 formed along the peripheral shape of the concave part 191. , And a heat seal roll 190 for press comprising an outer peripheral portion 193 located on the peripheral edge of the convex portion 192 and having an outer peripheral edge that is equal to the shape of the outer peripheral edge of the upper absorbent layer 20, in a normal manner. This can be done by pressing the upper absorbent layer 20. Note that a smooth roll is provided on the opposite surface of the heat seal roll (not shown), and the press treatment is performed by pressing the smooth roll and the heat seal roll 190 together.
[0025]
Since the absorbent body of the present embodiment is manufactured by the manufacturing method as described above, it can be manufactured without waste of materials and has excellent productivity.
[0026]
In addition, the absorptivity of this invention is not restrict | limited to the above-mentioned form, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, the first and second absorbent papers may not be provided.
[0027]
【The invention's effect】
Absorbers for absorbent articles such as (disposable) diapers, sanitary napkins, and incontinence pads of the present invention are excellent in fit and absorbency, do not fall off during use, and absorb performance by use It does not decrease.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of an absorbent body for an absorbent article according to the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a schematic view showing an outline of a preferable production method of the absorbent body of the present invention.
FIG. 4 is a view taken along arrow IV of FIG. 3;
FIG. 5 is a view taken in the direction of the arrow V in FIG. 3;
FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.
7 is a cross-sectional view in the width direction showing the inside of the drum used for folding the absorbent layer shown in FIG. 3 and the folded form of the absorbent layer. FIG.
FIG. 8 is a plan view showing a part of a press drum used when a three-dimensional shape is imparted to the absorber.
FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Absorber 10 Lower absorbent layer 20 Upper absorbent layer 30 Superabsorbent polymer layer 40 Bent part 51 First absorbent paper 52 Second absorbent paper 60 Three-dimensional part

Claims (3)

An absorber comprising a lower absorbent layer and an upper absorbent layer laminated on the lower absorbent layer,
The lower absorbent layer and the upper absorbent layer are connected at one side edge in the longitudinal direction of both of them, and the one side edge is folded and stacked as a bent portion,
A superabsorbent polymer layer is interposed between the lower absorbent layer and the upper absorbent layer,
The upper absorbent layer may have a three-dimensional section with a predetermined shape comprising a central solid portion separated by the groove provided continuously and the peripheral solid section,
An absorbent body for absorbent articles, wherein a groove having the same shape as the groove of the upper absorbent layer is formed on the surface of the lower absorbent layer . A lower absorbent layer and an upper absorbent layer laminated on the lower absorbent layer, wherein the lower absorbent layer and the upper absorbent layer are connected at one longitudinal edge of both, and the one side The manufacturing method of an absorbent article for an absorbent article, in which the edges are folded and laminated with a bent portion, and a superabsorbent polymer layer is interposed between the lower absorbent layer and the upper absorbent layer. And
An absorbent layer continuous body forming step of forming fibers on the continuous body of the first absorbent paper to form a continuous body of the absorbent layer;
A superabsorbent polymer layer forming step of forming a superabsorbent polymer layer by spreading a superabsorbent polymer in a predetermined shape on a continuous body of the absorbent layer at a predetermined interval;
While placing the continuous body of the second absorbent paper on the surface on which the superabsorbent polymer layer is formed, the portion where the superabsorbent polymer is not scattered in the continuous body of the absorbent layer, the upper absorbent layer and Tongue piece forming step of forming a tongue piece by completely notching one side of the same tongue piece shape,
A surface on which the superabsorbent polymer layer is provided with the tongue piece by using an extrusion drum provided with a drum body and an extrusion member that is pushed outward from the outer surface of the drum body. A folding step of forming the upper absorbent layer and the lower absorbent layer by extruding to the side, and further folding the tongue piece to the superabsorbent polymer layer side with the one side as the bent portion;
A continuous body cutting step of cutting the continuous body to obtain the individual absorbent bodies in the width direction of the continuous body at a position where the tongue piece is formed. Manufacturing method of absorber. The method for producing an absorbent body according to claim 2 , further comprising a three-dimensional shape imparting step of applying a press treatment to the upper absorbent layer side to impart a predetermined three-dimensional shape.

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