JP5060815B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

An example of an absorbent article that absorbs liquid excreted from the human body such as menstrual blood is a sanitary napkin. Recently, the number of sanitary napkins has increased, and as one of them, a main body portion disposed in underwear, and an absorbent body that has a liquid absorbing member that is superposed on the main body portion and absorbs liquid, There is a structure in which at least a part of the absorber in the longitudinal direction is joined to the main body at the joint, while at least a part of the absorber is separated from the main body. For example, Patent Document 1 discloses an absorber that can move back and forth with the front end portion as a fulcrum without joining only the front end portion in the longitudinal direction of the absorber to the main body portion and joining the other portions. It is shown.
JP 2002-159534 A

  In use, first, the main body is arranged on the inner surface of the undergarment (that is, the surface on the human body side) while aligning the longitudinal direction of the absorber with the longitudinal direction of the human body, and then the underwear is removed. In this state, the rear end of the absorber is pulled up so that the absorber enters the groove such as the flange, and the absorber is thereby sandwiched and fixed in the groove such as the flange.

  However, the portion of the main body that faces the crotch of the human body during use is often sandwiched between the crotch in the width direction, and as a result, the main body may be broken along the center line in the width direction. is there. Then, the folded main body portion sandwiches the absorbent body from both sides in the width direction, but by this sandwiching, a crease or the like along the longitudinal direction is secondarily formed in the absorbent body, and the crotch portion There was a possibility that the adhesiveness of the absorber would deteriorate.

  This invention is made | formed in view of the above conventional problems, Comprising: It aims at providing the absorbent article which can make the adhesiveness of the absorber with respect to a crotch favorable.

The main present invention for achieving the above object is as follows.
A main body of the absorbent article;
An absorbent body that has a liquid absorbing member that absorbs liquid and is superposed on the main body portion, and has an end portion and another end portion in the longitudinal direction, and the one end portion is a longitudinal portion of the main body portion at a joint portion. An absorber that is joined to one end portion in the direction, and the other end portion is movable as a free end with the one end portion of the absorber as a fulcrum ;
A rigidity element provided in the main body to increase the rigidity of the main body ;
With
The main body includes a central region of a predetermined range including a position corresponding to the face of the human body excretion port in a longitudinal direction of the main body, a front region located on the one end side of the main body from the central region, A rear region located on the opposite side of the one end side of the main body from the central region,
The joining portion is provided in the front region, and a portion of the absorber that overlaps the central region and a portion that overlaps the rear region are separated from the main body portion as the free end. Is movable
The main body has a second liquid absorbing member that absorbs liquid,
The rigid element is a compression groove formed by compressing the second liquid absorbing member along the longitudinal direction of the main body portion,
A plurality of the compressed grooves are formed side by side in the width direction of the main body,
In the central region, of the plurality of compressed grooves, the distance between the compressed grooves at both ends in the width direction of the main body is narrower than the width of the absorber.
In the front region, of the plurality of compressed grooves, a distance between the compressed grooves at both ends in the width direction of the main body is wider than the width of the joint portion.
This is an absorbent article.

  Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which can make the adhesiveness of the absorber with respect to crotch favorable can be provided.

  At least the following matters will become clear from the description of the present specification and the accompanying drawings.

A main body of the absorbent article;
An absorbent body having a liquid absorbing member that absorbs liquid, wherein the absorbent body is superposed on the main body portion, and at least a part in the longitudinal direction is joined to the main body portion at a joint portion;
An absorbent article comprising: a rigid element provided in the main body portion for increasing the rigidity of the main body portion, and provided in a central portion in the width direction intersecting the longitudinal direction. .
According to such an absorbent article, since the rigidity of the central portion of the main body is increased by the rigid element, the main body is moved in the width direction by the crotch of the human body during use of the absorbent article. Even if it is sandwiched, the central portion is difficult to break. Therefore, a situation in which the main body portion strongly sandwiches the absorber from both sides in the width direction is generally avoided, and as a result, it is effectively prevented that wrinkles along the longitudinal direction are formed in the absorber. It is. And the adhesiveness of the said absorber with respect to a crotch can be made favorable.

Such an absorbent article,
The central portion is a predetermined range in the longitudinal direction including the position corresponding to the face of the human body excretion opening,
It is desirable that the absorber is superposed on the central portion.
According to such an absorbent article, it is possible to effectively enjoy the effect of the rigid element that the adhesiveness of the absorbent body to the crotch can be improved during its use.
The reason for this is as follows. Usually, since the crotch of the human body straddles the human body excretion opening in the longitudinal direction, the central portion of the predetermined range defined as described above is located corresponding to the crotch with respect to the longitudinal direction. That is, the central portion is located at a position that is most easily affected by the crotch pinching.

Such an absorbent article,
It is desirable that the rigidity of both sides in the width direction of the central portion of the main body portion is lower than the rigidity of the central portion where the rigid element is provided.
According to such an absorbent article, the both side portions are lower in rigidity than the central portion, so when sandwiched between the crotch, the both side portions are more than the central portion. Bend first. Therefore, even in the case where the main body is wider than the crotch in the width direction, the dimensional difference is effectively absorbed and eliminated by bending the both end portions along the longitudinal direction. As a result, the central portion can be maintained in a state of not being bent.

Such an absorbent article,
The main body has a second liquid absorbing member that absorbs liquid,
The rigid element is preferably a compression recess formed by compressing the second liquid absorbing member in a direction in which the absorber is superimposed on the main body.
According to such an absorbent article, the rigid element for enhancing the rigidity of the main body can be provided without particularly attaching a separate part, and the configuration of the absorbent article can be simplified. .

Such an absorbent article,
The compression recess is a compression groove formed continuously along the longitudinal direction,
The central portion is formed with a plurality of the compressed grooves arranged in the width direction,
The center portion may be a region sandwiched between the compressed grooves at both ends while including the compressed grooves at both ends in the width direction.

Such an absorbent article,
The second liquid absorbing member is a pulverized pulp laminated with a predetermined basis weight distribution,
It is preferable that the basis weight of the pulverized pulp is smaller in the both sides of the central portion in the width direction than in the central portion.
According to such an absorbent article, it is possible to easily make the rigidity of the both side portions lower than that of the central portion.

Such an absorbent article,
The size of the central portion in the width direction is preferably 15 to 45 mm.
According to such an absorbent article, since the size in the width direction of the central portion is set to a representative dimension of the crotch width of the human body, it can be used even if the rigidity of the central portion is increased. There is no sense of incongruity between the crotch, so that the absorbent article has excellent wearability.

Such an absorbent article,
The absorber has one end and the other end with respect to the longitudinal direction,
The part may be the one end, and the other end may be separated from the main body and movable as a free end having the one end as a fulcrum.

Such an absorbent article,
The rigidity is preferably bending rigidity in the width direction.
According to such an absorbent article, the folding in the width direction of the central portion is effectively suppressed by the rigid element.

Such an absorbent article,
In the joint portion, the absorber may be separably joined to the main body portion.

Such an absorbent article,
The rigid element is disposed in a central portion of the main body in the width direction;
It is desirable that the absorber is superposed on the rigid element.
According to such an absorbent article, at the time of wearing, the position of the absorber is guided to the center in the width direction where the genital part of the human body is located, and as a result, the absorber is securely adhered to the genital part. It becomes possible to make it. Details are as follows. In the process of pulling up the undergarment to the human body after fixing the absorbent article to the undergarment, the rigid element at the center in the width direction is the genital part while both side parts (both sides) of the rigid element of the main body are bent. Heading towards. At this time, since the absorber is disposed on the rigid element, that is, in the central portion in the width direction of the main body, the position of the absorber is determined by the bending of the both side portions described above. It is held at the center in the width direction. As a result, the absorber can be securely adhered to the shadow.

=== First Embodiment ===
<<< About Absorbent Article 1 >>>
This absorbent article 1 is a sanitary napkin, for example. In the following, the side in contact with the human body is the front side, the side in contact with the underwear 90 is the back side, the end located on the front side of the human body when worn is the front end, and the end located on the rear is the rear end explain. Moreover, the normal line direction of the surface or the back surface of the absorbent article 1 is also called a thickness direction.

FIG. 1 is a plan view of the surface side of the absorbent article 1 in a developed state, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a perspective view of the absorbent article 1, and FIGS. 4 to 6 are perspective views of the absorbent article 1 for explaining a state in use.
As shown in FIG.1 and FIG.2, the absorbent article 1 has comprised the shape long in the predetermined direction as a whole. Hereinafter, the predetermined direction is referred to as a longitudinal direction, and a direction orthogonal to the longitudinal direction is referred to as a width direction. In addition, the said longitudinal direction corresponds with the front-back direction of a human body in a mounting state.
As shown in FIG. 3, the absorbent article 1 includes a base absorbent body 10 (corresponding to a main body portion of the absorbent article 1) and a surface of the base absorbent body 10, and a center in the width direction of the base absorbent body 10. And a top absorbent body 20 (corresponding to an absorbent body) disposed along the longitudinal direction.

  Here, the front end 20a of the top absorbent body 20 is joined to the front end 10a of the base absorbent body 10, while the rear end 20b is movable separately from the base absorbent body 10 using the front end 20a as a fulcrum. It is a free end. Therefore, when the absorbent article 1 is used, as shown in FIG. 4, the base absorbent body 10 is adhered and fixed to the inner surface of the undergarment 90 while the longitudinal direction thereof is arranged along the front-rear direction of the human body. When the underwear 90 is put on, the top end 20b is pulled up as shown in FIG. 5 so that the top absorbent 20 enters the groove of the buttocks and the like and is attached to the human body in the state shown in FIG. . Then, the liquid excreted from the groove is mainly absorbed by the top absorbent body 20.

Incidentally, in this absorbent article 1, as shown in FIG. 1, on the center line CL in the width direction of the absorbent article 1, on the front side from the center in the longitudinal direction, the vaginal opening facing position Z ( It corresponds to the position corresponding to the face of the human body excretion opening). In other words, in the absorbent article 1, the length on the rear side from the assumed position Z of the vaginal opening is longer than the length on the front side from the position Z.
Hereinafter, each component of the absorbent article 1 will be described in detail.

<Base absorbent body 10>
FIG. 7 is a plan view of the surface side of the base absorbent body 10. FIG. 8 is a plan view of the back side. 9A to 9C are an AA sectional view, a BB sectional view, and a CC sectional view, respectively, in FIG. In these drawings, only the outline is virtually indicated by a dotted line while seeing through the top absorbent body 20.

  As shown in FIG. 7, the planar shape of the base absorbent body 10 is a substantially rectangular shape that is long in the longitudinal direction. However, in the longitudinal direction, a predetermined range centering on the estimated position Z facing the vaginal opening is widened in the width direction. The widened portions are so-called wing portions 32 and 32, which will be described later. Hereinafter, a region where the wing portion 32 exists in the longitudinal direction is referred to as a central region Rc, a region in front of the wing portion 32 is referred to as a front region Ra, and a rear region is referred to as a rear region Rb.

  As shown in FIGS. 7 and 9B, a base absorbent body 10 includes an absorbent base material 12 that absorbs a liquid, and a topsheet 14 that is provided so as to cover at least the surface side of the absorbent base material 12 over the entire surface. And a side sheet for forming a back sheet 30 for preventing leakage of the liquid absorbed by the absorbent body 12 to the back side, and a leak-proof wall 46 for preventing leakage of the liquid to the outside in the width direction. 40.

  The absorbent substrate 12 includes a pulverized pulp laminate 12a (corresponding to a second liquid absorbing member) obtained by laminating pulverized pulp (hereinafter referred to as pulverized pulp) based on a predetermined basis weight distribution pattern, It has a liquid-permeable sheet (not shown) such as tissue paper that wraps the pulverized pulp laminate 12a, and a superabsorbent polymer (not shown) mixed in the pulverized pulp laminate 12a. The shape is a substantially rectangular flat plate. The basis weight distribution pattern of the pulverized pulp according to the pulverized pulp laminate 12a will be described later (see FIG. 10).

  The top sheet 14 is, for example, a substantially rectangular liquid-permeable sheet whose shape is substantially similar to an eye that is slightly larger than the planar shape of the absorbent body 12. The material is an appropriate non-woven fabric or the like. For example, an air-through non-woven fabric or a spun lace non-woven fabric formed of synthetic resin fibers such as polyester or polyethylene is used after being hydrophilized.

  The surface sheet 14 is embossed with a groove in a predetermined region in a state where it overlaps the absorber base material 12 while a hot-melt adhesive is interposed between the top surface sheet 14 and the absorbent base material 12, Thereby, the surface sheet 14 is joined and integrated with the absorber base material 12. The grooved embossing is performed by compressing a predetermined portion in the predetermined region in the thickness direction of the absorbent article 1 while being heated by a pair of opposing pressing members (not shown). In the predetermined region, a compressed groove 15 is formed which is compressed in the thickness direction (see FIGS. 7 and 9A to 9C).

  Here, one clamping member of the pair of clamping members has a continuous rib-shaped protrusion, and an island-shaped protrusion is further formed on the top of the rib-shaped protrusion. Are provided intermittently with respect to the continuous direction of the protrusions. Further, the surface of the other pressing member facing the rib-shaped protrusion is formed flat. Therefore, as shown in FIG. 7, the compressed groove 15 formed by the grooved embossing is formed by alternately repeating the depth along the extending direction, that is, the low compression portion 15a compressed at a low compression rate. And the high compression part 15b compressed by the compression rate higher than it is formed in the extension direction of the compression groove | channel 15 by turns.

  When such a compressed groove 15 is formed in a predetermined area, the rigidity of the predetermined area is increased. Therefore, in the first embodiment, the compressed groove 15 is selectively selected mainly for an area requiring rigidity. In other words, the compressed groove 15 also functions as a rigid element for partially increasing the rigidity of the base absorbent body 10. For example, as shown in FIG. 7, the compression groove 15 as the rigid element is formed in the front region Ra or the central region Rc, which will be described later.

  The back sheet 30 is a liquid-impermeable sheet made of, for example, polyethylene or polypropylene, and as shown in FIG. 7, the shape is longer than the absorbent substrate 12 in the longitudinal direction and in the width direction. The shape is wider than the absorbent substrate 12. Then, as shown in FIG. 9B, in the state where the absorbent base material 12 is bonded to the front surface side of the back sheet 30 with a hot melt adhesive (not shown), the back sheet 30 is at least in FIG. The front end portion 30 a and the rear end portion 30 b shown in the figure are joined to the topsheet 14 by welding or the like, whereby the absorber base material 12 is held between the backsheet 30 and the topsheet 14.

  As shown in FIG. 8, after the absorbent article 1 is arranged on the inner surface of the undergarment 90, it adheres to the inner surface of the undergarment 90 from the arrangement position after the absorbent article 1 is arranged on the inner surface of the undergarment 90. A “slipping prevention attachment portion 31” for fixing is provided. For example, the anti-slipping attachment portion 31 is a hot-melt adhesive applied to a predetermined range on the back surface 30c of the back sheet 30, and in the illustrated example, a pair of anti-slipping attachment portions 31, 31 are formed continuously from the front end portion 10a to the rear end portion 10b of the base absorbent body 10 with a predetermined interval in the width direction. Note that the mode of the anti-slip attachment part 31 is not limited to this. For example, by applying a hot-melt adhesive to the portion between the left and right anti-slip attachment parts 31, 31, You may make the attachment part 31 for a stop into one area | region continuous in the width direction.

  Further, in order to make the slippage between the underwear 90 and the absorbent article 1 stronger, as shown in FIG. 8, wing portions 32, 32 are provided at both ends in the width direction of the back sheet 30 in the width direction. The wing portions 32, 32 are provided with “an anti-displacement attachment portion 33” on the back surface thereof. That is, for example, a hot-melt adhesive is also applied to the back surfaces of the wing portions 32. Then, the wings 32 and 32 are folded outward as shown in FIG. 4, and are attached and fixed to the outer surface of the undergarment 90 by the anti-displacement attaching part 33. Incidentally, the center position of the wing part 32 in the longitudinal direction coincides with the aforementioned expected position Z facing the vaginal opening.

The side sheet 40 is for forming the leak-proof walls 46 in the vicinity of both end portions in the width direction of the absorbent base material 12 as shown in FIG. 9B, and as shown in FIG. 9B and FIG. Is provided so as to cover the top sheet 14 from the top side.
Specifically, as shown in FIG. 7, the pair of side sheets 40 and 40 are arranged in line symmetry with respect to the center line CL in the width direction, and along the longitudinal direction with a predetermined interval therebetween. The back sheet 30 extends from the front end 30 a to the rear end 30 b, that is, to the outer contour of the absorbent article 1. Then, as shown in FIG. 9B, the side sheets 40 and 40 are respectively crimped and fixed to the top sheet 14 at positions near both ends in the width direction of the absorbent base material 12 to form the fixing portions 44. An end 46 extending from the fixed portion 44 toward the center line CL in the width direction is a free end. That is, the side sheets 40, 40 are folded back to the outside in the width direction at the end portion 46, and the side sheets 40 are bonded together by a hot melt adhesive in a stacked state. Between the sheets, an elastic member 48 such as a rubber thread is intermittently fixed by a hot melt adhesive along the longitudinal direction in a stretched state. Therefore, when the absorbent article 1 is curved in the longitudinal direction so that the topsheet 14 side is inside, the elastic member 48 contracts in the longitudinal direction, thereby preventing the end 46 from rising from the topsheet 14. It becomes the leak wall 46.

  Note that in the side sheet 40, in a portion ahead of the portion that is folded back at the end portion 46 and overlapped, the two sheets are overlapped at the position of the fixing portion 44 as shown in FIG. 9B. However, the outer end edge extends to the outer contour of the back sheet 30, that is, the outer contour of the absorbent article 1. And the said outer edge (refer the part shown with a hatching in FIG. 7) is joined by the thermocompression bonding etc. over the outer edge of the width direction of the back surface sheet 30 over a longitudinal direction.

Further, as shown in FIGS. 9A and 9C, the front end portion and the rear end portion of the end portion 46 which is a leak-proof wall are joined to the side sheet 40 by a hot melt adhesive in a state where the front end portion and the rear end portion are faced down to the surface sheet 14 side. Therefore, it is a non-standing part that does not stand up. And the standing state of the leak-proof wall 46 which exists between these non-standing parts before and behind is adjusted by changing the position and length of the longitudinal direction of this non-standing part.
Such a side sheet 40 is made of a hydrophobic sheet, and as the material thereof, for example, a spunbonded nonwoven fabric formed of synthetic resin fibers such as polypropylene and polyethylene is used.

  Incidentally, it is desirable that a hot-melt adhesive is interposed between the top sheet 14, the absorbent base material 12, the back sheet 30, and the side sheet 40 described above.

FIG. 10 is a basis weight distribution diagram of the pulverized pulp according to the pulverized pulp laminate 12a. In the drawing, the basis weight distribution is shown not only in a plan view but also in a sectional view. Moreover, the numerical value in the figure represents the basic weight (g / m < ² >) of the ground pulp of the area | region pointed out by the arrow.
As shown in FIG. 10, basically, pulverized pulp is laminated with a basis weight (eg, 200 g / m ² ) of a predetermined reference value over the entire area of the pulverized pulp laminate 12a. However, there are some areas where the basis weight is larger or smaller than this reference value.

For example, as shown in FIG. 10, in a rectangular area (refer to an area indicated by a dark color in the drawing) having the vaginal opening facing position Z substantially in the center in the width direction and the longitudinal direction, A larger basis weight (for example, 500 g / m ² ) is set. This also has the meaning of effectively absorbing the fluid excreted from the vaginal opening, but also has the meaning of increasing the bending rigidity of this rectangular region. That is, the rectangular region generally corresponds to a region where the compression groove 15 as a rigid element is formed in the above-described front region Ra and central region Rc. Therefore, even if the basis weight is large, the bending rigidity of the region where the compressed groove 15 is formed can be increased, thereby effectively supporting the action of increasing the bending rigidity of the compressed groove 15.

Moreover, the area | region of the basis weight (for example, 100 g / m < ² >) smaller than the said reference value exists in the part of the both sides of the width direction of this rectangular area adjacent to the said rectangular area. These regions function as a folding starting point for the base absorbent body 10 to be easily bent at the position in the width direction. This is because, when the bending rigidity of the central region Rc described above is uniformly high over the entire width in the width direction, the central region Rc that is generally set wider than the assumed width between the crotch is sandwiched between the crotch at the time of wearing. In this case, there is no escape space of the central region Rc having an excessive width, and the entire central region Rc is inclined obliquely with respect to the crotch, so that the wearability is deteriorated. That is, the pair of the regions in the width direction is folded along the longitudinal direction as a fold starting point, thereby absorbing the difference in width between the assumed width between the crotch and the central region Rc.

  Furthermore, as shown in FIG. 10, in the predetermined range of the rear region Rb (refer to the range shown by hatching in the figure), the basis weight of the pulverized pulp at the center in the width direction is set in the width direction. It is less than the basis weight of the parts on both sides. This predetermined range is a region corresponding to the anus of the human body and its peripheral part, that is, a part that is most deeply likely to enter a groove such as a buttocks. Therefore, by reducing the basis weight of the central portion in the width direction, the predetermined range can be easily folded so that the surface side is mountain-folded at the center in the width direction, whereby the portion of the predetermined range in the base absorbent body 10 However, it is easy to enter into a groove such as a buttocks of a human body.

<Top absorber 20>
FIG. 11 is a plan view of the top absorbent body 20 in a developed state. 12A to 12D are an AA sectional view, a BB sectional view, a CC sectional view, a DD sectional view, and an EE sectional view, respectively, in FIG. .

  As shown in FIGS. 11, 12 </ b> B, and 12 </ b> C, the top absorbent body 20 is disposed on the surface side of the pulverized pulp laminate 22 (corresponding to a liquid absorbent member) that absorbs liquid and the pulverized pulp laminate 22. An intermediate sheet 23, and a shape-retaining sheet 24 for wrapping the pulverized pulp laminate 22 and the intermediate sheet 23 together, and holding the pulverized pulp laminate 22 and the like in a long shape in the longitudinal direction; ing.

  The pulverized pulp laminate 22 is formed by laminating pulverized pulp mixed with a superabsorbent polymer based on a predetermined basis weight distribution pattern into a substantially rectangular parallelepiped shape. The basis weight distribution pattern will be described later (see FIG. 14).

 The intermediate sheet 23 is a rectangular liquid-permeable sheet that has better liquid drawability than the shape-retaining sheet 24. As the material thereof, for example, an air-through nonwoven fabric formed of synthetic resin fibers such as polypropylene is used. The The intermediate sheet 23 is subjected to hole embossing in a state where it is overlapped with the shape-retaining sheet 14, whereby the intermediate sheet 23 is joined and integrated with the shape-retaining sheet 24 (see FIGS. 12B to 12D). .

 Incidentally, the hole embossing is performed using a pair of processing members (not shown) opposed to each other. That is, one processing member is provided with a conical protrusion, and the other opposing processing member is provided with a hole into which the protrusion enters. The processed member on which the protrusion is formed is heated, and the conical protrusion passes through the intermediate sheet 23 and the shape-retaining sheet 24 that are overlapped with each other, and a large number of holes 28 (FIG. 1 or FIG. 11 is formed, the intermediate sheet 23 is joined and integrated with the shape-retaining sheet 24 by heat-sealing the hole edges.

 The shape-retaining sheet 24 is a liquid-permeable sheet, and the same material as the surface sheet 14 of the base absorbent body 10 is used as the material, for example. The planar shape when the shape retaining sheet 24 is flatly developed into a sheet shape is substantially rectangular. Then, with the hot melt adhesive applied to the entire surface of the shape retaining sheet 24 in the developed state, the shape retaining sheet 24 is rolled into a cylindrical shape as shown in FIG. 12B, and both end portions 24e in the width direction thereof. , 24e are overlapped and joined with a hot melt adhesive, the pulverized pulp laminate 22 and the intermediate sheet 23 are accommodated in the longitudinal direction inside the cylinder.

 Further, in the shape retaining sheet 24 shown in FIG. 11, the front portion 24 c and the rear portion 24 d in the longitudinal direction are not in the state of the pulverized pulp laminate 22 and the intermediate sheet 23 as shown in FIGS. 12A and 12E, respectively. In addition, the folded portions 24c and 24d are subjected to pressure bonding by embossing in a state where a hot melt adhesive (not shown) is interposed, whereby the front end portion 24c in the longitudinal direction of the shape retaining sheet 24 is applied. The rear end portion 24d is sealed to form thin sealing portions 25 and 26 having a rectangular shape in plan view (see FIG. 11).

 Incidentally, the above-mentioned embossing is performed by clamping the workpiece by a pair of clamping members (not shown) facing each other. That is, a protrusion is formed on one of the pair of pressing members, and a surface of the other pressing member that faces the protrusion is formed flat. And since the front-end | tip of the said protrusion is formed flat here, when pinched | interposed into these pair of pressing members, the recessed part which has a flat bottom part is squeezed and formed in the said process object, The said recessed part is formed. Embossed.

  As shown in FIG. 1, such a top absorbent body 20 is substantially the same length as the base absorbent body 10 in the longitudinal direction, but is narrower than the base absorbent body 10 in the width direction. On the surface side of the body 10, the center lines CL in the width direction are aligned and overlapped. As shown in FIGS. 2 and 3, the front end 20a of the top absorbent body 20 is firmly joined to the front end 10a of the base absorbent body 10, and the other parts are basically not joined. Thus, the rear end portion 20b of the top absorbent body 20 is turnable in the front-rear direction with the front end portion 20a as a fulcrum.

  Here, the term “joint” means that if the top absorbent body 20 and the base absorbent body 10 are intentionally separated, at least one of the top absorbent body 20 and the base absorbent body 10 may be damaged. This refers to an inseparable state that is firmly joined to the extent. Examples of the main bonding method include adhesion using a hot wire adhesive having a thick wire diameter capable of strong bonding, and the embossing with the groove described above. Here, the former bonding is adopted. Yes.

  FIG. 13 is an explanatory view of the state of the main bonding by this bonding, and shows the front end portion 10a of the base absorbent body 10 in an enlarged manner. In the following, a portion at the front end portion 10a of the base absorbent body 10 and where the front end portion 20a of the top absorbent body 20 is finally joined is referred to as a “main joined portion 10g”. The range of the main joint portion 10g is indicated by a dark color in FIG. 13. The main joint portion 10g is set at the center in the width direction of the front region Ra of the base absorbent body 10, and the planar shape thereof is shown in FIG. The top absorbent body 20 shown in FIG. A hot melt adhesive (in the drawing) has a predetermined coating pattern, for example, a pattern in which a plurality of straight lines along the longitudinal direction are arranged in the width direction in the illustrated example. In this case, at least the front-side sealing portion 25 of the top absorbent body 20 is overlapped and bonded to the main joint portion 10g, so that the top absorbent body as shown in FIG. The front end 20 a of 20 is finally joined to the front end 10 a of the base absorbent body 10.

  Here, the target part of the main bonding on the top absorbent body 20 side may be the front sealing part 25 only. However, in the first embodiment, as shown in FIG. It extends not only to the stop 25 but also to the portion where the pulverized pulp laminate 22 is present from the rear. That is, as shown in FIG. 2, the length Lg in the longitudinal direction of the main joining portion 10 g is longer than the length La of the sealing portion 25 on the front side of the top absorbent body 20. This is because when only the front sealing portion 25 is joined, there is a possibility that the rigidity becomes too small because the sealing portion 25 is thin. In this case, the top absorbent body as a whole This is because 20 is likely to be wobbling back and forth and difficult to handle.

  By the way, the sealing portion 26 on the rear side of the top absorbent body 20 shown in FIG. 11 may be temporarily joined to the base absorbent body 10 when not used. Here, the term “temporary bonding” refers to a state in which the user is easily bonded to such an extent that the user can easily separate the top absorbent body 20 from the base absorbent body 10 without impairing the functions of the base absorbent body 10 and the top absorbent body 20. Examples of the temporary bonding method include the aforementioned embossing.

  In this temporarily joined state, the rear sealing portion 26 protrudes backward by about 20 mm from the outer contour of the base absorbent body 10 to such an extent that the user can pick it up (see FIG. 1). ) That is, the rear end portion of the sealing portion 26 on the rear side functions as a knob portion 26a for the user to pick when wearing it.

  Further, as shown in FIG. 11, a locking member for locking the rear end portion 20 b of the top absorbent body 20 to the rear region Rb of the top sheet 14 of the base absorbent body 10 on the back surface side of the top absorbent body 20. 27 is provided. Specifically, the locking member 27 is provided in a portion in the latter half of the top absorbent body 20 and in front of the sealing portion 26 on the rear side. Then, as shown in FIG. 6, the movement of the top absorbent body 20 during use of the absorbent article 1 is restricted by the locking member 27, and the position of the top absorbent body 20 is adjusted at the time of wearing. Maintained in position. For example, a male material of a mechanical fastener is used as the locking member 27. In that case, a female material of a mechanical fastener may be provided on the base absorbent body 10 side in order to increase the locking force. The installation position of the locking member 27 may be other than the above. For example, the locking member 27 may be provided in the rear sealing portion 26 and locked to the undergarment 90 at the time of mounting. Further, since the top absorbent body 20 in the mounted state is sandwiched in a groove such as a buttocks, the top absorbent body 20 can be fixed to the human body without the locking member 27 described above. Therefore, the locking member 27 is not an essential component and may be omitted.

  Further, as shown in FIG. 11 and FIG. 12D, the rear end portion 20 b of the top absorbent body 20 and at least a portion where the pulverized pulp laminate 22 is present are covered with the pulverized pulp laminate 22 from the back surface side to prevent it. A leakage sheet 51 is provided. The leak-proof sheet 51 is a liquid-impermeable sheet and has a function of preventing the liquid absorbed by the pulverized pulp laminate 22 from oozing out to the outer surface of the top absorbent body 20. That is, when the absorbent article 1 is used, the rear end portion 20b of the top absorbent body 20 may protrude rearward from the rear end edge 10e of the base absorbent body 10 as shown in FIG. If the liquid is oozing out on the outer surface of the rear end portion 20b of the top absorbent body 20, the underwear 90 is soiled when the rear end portion 20b of the top absorbent body 20 comes into contact with the underwear 90. The sheet 51 prevents the rear end portion 20b from exuding to the outer surface on the back surface side. As a material of the leak-proof sheet 51, a non-porous film such as polyethylene or polypropylene that can completely block the liquid is desirable, but it may not be completely blocked, and may be, for example, a nonwoven fabric made of water-repellent fibers.

FIG. 14 is a basis weight distribution diagram of pulverized pulp according to the pulverized pulp laminate 22. In the drawing, the basis weight distribution is shown not only in a plan view but also in a sectional view. Moreover, the numerical value in the figure represents the basic weight (g / m < ² >) of the ground pulp of the area | region pointed out by the arrow.
As shown in FIG. 14, basically, the portion other than the aforementioned front sealing portion 25 and rear sealing portion 26 has a basis weight substantially equal to the reference value over the entire area in the longitudinal direction and the width direction. The pulverized pulp is laminated at (for example, 500 g / m ² ). However, a region where the basis weight is smaller than the reference value partially exists.

  For example, as shown in a plan view in FIG. 14, the portions where the basis weight of the pulverized pulp is reduced in the width direction in the three places P1, P2, and P3 in the longitudinal direction than in the portions adjacent to each other in the longitudinal direction. Is present. These portions are for facilitating folding of the absorbent article 1 into four during packaging, which will be described later. That is, the longitudinal positions P1, P2, and P3 of these portions respectively correspond to the folding positions at the time of packaging. Hereinafter, the folding position P1 on the rear end side is referred to as a first folding position P1, the folding position P3 on the front end side is referred to as a third folding position P3, and the central folding position P2 between these is referred to as a second folding position. Say position P2.

  Moreover, as shown in FIG. 14, in the predetermined range of the top absorbent body 20 in the longitudinal direction (refer to the range shown by diagonal lines in the figure), the basis weight of the pulverized pulp at the center in the width direction is The basis weight of both sides in the width direction is less. This predetermined range is a region corresponding to a portion from the perineum to the anus of the human body, that is, a portion that enters the groove such as the buttocks deeper in the top absorbent body 20. Therefore, by reducing the basis weight of the central portion in the width direction, the top absorbent body 20 is easily folded so that the surface side is mountain-folded at the center in the width direction. The part quickly enters a groove such as a buttocks of a human body. Incidentally, although the aforementioned locking member 27 is virtually shown by a dotted line in the figure, its installation position is located behind the predetermined range. Therefore, even if the predetermined range is folded in a mountain fold shape, the locking member 27 is not easily folded in a mountain fold shape, so that the locking member 27 can maintain a substantially flat state, and the base absorbent body 10 is brought into a surface contact state. Securely locked.

<<< Packaging of absorbent article 1 >>>
FIG. 15A thru | or FIG. 15D is explanatory drawing of a mode that the absorbent article 1 is packaged.
When packaging, first, as shown in FIG. 15A, with the wings 32, 32 on both sides of the absorbent article 1 open, as shown in FIG. Protection sheets 35 and 35 for protecting the adhesive strength of 33 and 33 are provided to cover the wing portions 32 and 32. And in this covered state, these wing parts 32 and 32 are each bent to the surface side as shown in FIG. 15C, but in this case, the adhesive previously applied to one protective sheet 35 The two protective sheets 35 and 35 are connected and integrated by the overlapped portion at the center in the width direction by 35a.

  Incidentally, these protective sheets 35, 35 have a role of forming the anti-slipping attachment part 33 on the back surface of the wing part 32 in addition to the role of protecting the adhesive force of the above-described anti-slipping attachment part 33. That is, a release agent and a hot-melt adhesive are applied to these protective sheets 35 and 35 in advance before being provided on the wing portions 32 and 32. And after covering the wing parts 32 and 32 with the protection sheets 35 and 35 as mentioned above, when the user peels off the protection sheets 35 and 35 from the wing parts 32 and 32 to use the absorbent article 1, for example, Due to the action of the release agent, the hot-melt adhesive is transferred and left on the wing portions 32 and 32, so that the anti-slip attachment portions 33 and 33 are formed on the wing portions 32 and 32.

  The protective sheet having such a role is separately provided on the back surface 30 c of the back sheet 30. That is, as described above, since the anti-slip attachment portions 31 and 31 are also formed on the back surface 30c of the back sheet 30, the protective sheet 34 is formed on the back sheet 30 as virtually indicated by a two-dot chain line in FIG. It is provided so as to cover the back surface 30c.

  When the protective sheets 34 and 35 are thus provided on the absorbent article 1 as described above, the absorbent article 1 is provided with a substantially rectangular packaging sheet 36 disposed on the back side thereof as shown in FIG. 15D. At the same time, it is folded at three points P1, P2 and P3 in the longitudinal direction and folded into four.

  FIGS. 16A to 16D are plan views showing how the absorbent article 1 is folded in four. FIG. 16A shows the absorbent article 1 before being folded, and FIG. 16B shows that the absorbent article 1 is folded at a first folding position P1 set on the rear end side of the absorbent article 1. It shows a state. 16C shows a state where the absorbent article 1 is bent at the second folding position P2 set on the center side of the absorbent article 1, and FIG. 16D shows a front end portion of the absorbent article 1. The mode that the absorbent article 1 is bent in the 3rd folding position P3 set to the side is shown.

  As shown in FIG. 16B, first, at the first folding position P1 on the rear end part side, the rear end part is bent up to the surface side, and the rear end part is the absorbent article. It is overlapped on the surface side of 1 and becomes a two-step stack. Next, as shown in FIG. 16C, at the second folding position P <b> 2 on the center side, the above-described two-tiered portion is further bent to the surface side, whereby the two-tiered portion is absorbed. It overlaps with the surface side of the property article 1, and becomes 3 steps | paragraphs. Then, as shown in FIG. 16D, at the third folding position P3 on the front end side, the part on the front end side is bent up, and the part on the front end side is overlapped with the above-described three-tiered part. Combined to form 4 layers. In the four-tiered state, that is, in the four-fold state, the lead tape 38 at the front end of the packaging sheet 36 is attached to the outer surface of the three-tiered portion, and the absorbent article 1 is fixed in the four-fold state. .

  If it does so, finally, as shown to FIG. 16D, the outer edge 36c along the longitudinal direction will adhere | attach and seal the packaging sheet 36, and it will become a bag shape, and the absorbent article 1 will be in a packaging state with this.

<<< Installation of Absorbent Article 1 to Human Body >>>
In the absorbent article 1 that has reached the user's hand in the above-described packaging state, the packaging sheet 36 is opened by the user peeling off the lead tape 38, and accordingly, the protective sheet 34 and the protective sheet 35 are peeled off. The anti-slip attachment 31 of the back surface 30c of the back sheet 30 and the anti-slip attachment 33 of the back of the wing 32 are exposed.

  Then, the absorbent article 1 is disposed on the inner surface of the undergarment 90 as shown in FIG. 4 and fixedly adhered to the inner surface of the undergarment 90 by the anti-displacement adhering portion 31, and the wing portion 32 is on the undergarment 90 side. And is attached and fixed to the outer surface of the undergarment 90 by the anti-displacement attaching portion 33.

  When the absorbent article 1 is attached and fixed to the undergarment 90 in this way, the undergarment 90 is pulled up to the human body side, that is, put on the user. If it does so, as shown in FIG. 5, the knob | pick part 26a of the top absorber 20 will be picked by the user, and the top absorber 20 will be pulled up, and, thereby, temporary joining of the base absorber 10 and the top absorber 20 is carried out. The rear end portion 20 b of the top absorbent body 20 is separated from the base absorbent body 10 by being released.

  Thereafter, when the user pulls the knob 26a rearward in the longitudinal direction, the position of the top absorbent body 20 is adjusted so that the top absorbent body 20 enters and adheres to a groove such as a buttocks of a human body. Then, with the top absorbent body 20 adjusted in position, as shown in FIG. 6, the locking member 27 of the top absorbent body 20 is locked and fixed to the inner surface of the base absorbent body 10 or the undergarment 90. The top absorbent body 20 is positioned in a state where it is preferably abutted.

<<< Problems during use of absorbent article 1 >>>
FIG. 17A and FIG. 17B are schematic views for explaining problems during use of the absorbent article 1. In both figures, the absorbent article 1 of the comparative example is shown in cross-sectional view at the center of the vaginal opening facing position Z. However, the base absorbent body 10 of the absorbent article 1 of this comparative example is not provided with the compressed groove 15 as the rigid element described above.

  During use of the absorbent article 1, the central region Rc of the base absorbent body 10 facing the crotch (corresponding to a predetermined range including the facing position of the human body excretion opening (the vaginal opening facing position Z)) is caused by the crotch. It is sandwiched in the width direction. Here, when the bending rigidity of the central region Rc in the width direction is high, as shown in FIG. 17A, the bending rigidity of the central region Rc can maintain a substantially flat shape against pinching between the groins. On the other hand, when the bending rigidity is low, as shown in FIG. 17B, the base absorbent body 10 is bent in the width direction along the center line CL without resisting the crotch. Then, the base absorbent body 10 folded at the center line CL sandwiches the top absorbent body 20 from both sides, and this sandwiching forms a wrinkle along the longitudinal direction on the top absorbent body 20. As a result, the adhesiveness of the top absorbent body 20 to the crotch may be deteriorated.

  Therefore, in the first embodiment, a compression groove 15 as a rigid element is formed in the central portion in the width direction of the central region Rc of the base absorbent body 10 to increase the bending rigidity in the width direction. In addition, deterioration of the adhesion of the top absorbent body 20 to the crotch is prevented. In the following, unless otherwise specified, simply speaking “bending rigidity” refers to “bending rigidity in the width direction”.

<<< Compressive groove 15 as a rigid element provided in the base absorbent body 10 >>>
FIG. 18A shows a plan view of the surface side of the base absorbent body 10. In FIG. 18A, only the outline is virtually indicated by a dotted line while seeing through the top absorbent body 20.

  As described above, the compression groove 15 as the rigid element is formed by denting from the surface sheet 14 side when the surface sheet 14 and the absorbent body 12 are compressed and integrated in the thickness direction by grooved embossing. Is done. And the bending rigidity of the area | region in which this compression groove | channel 15 was formed becomes high by the raise of the fiber distribution density, etc. by the compression.

  In the first embodiment, such a compressed groove 15 is formed in the central portion in the width direction in the central region Rc of the base absorbent body 10. That is, a plurality of (for example, 4 to 5) compressed grooves 15 along the longitudinal direction are formed side by side in the central portion, and these compressed grooves 15 are adjacent to each other. 15 is appropriately spaced.

  And according to this, the bending rigidity of the center part of the width direction in the said center area | region Rc can be selectively improved, As a result, the base absorber 10 may bend | fold at the center line CL of the width direction or its vicinity. Effectively prevented.

  In addition, since the area | region pinched | interposed between the compression grooves 15 and 15 of the both ends of the width direction is an area | region where bending rigidity is substantially improved by the compression groove 15, below, this area | region is called "high rigidity. Say “Area”. That is, the “high rigidity region” means a region including the compression grooves 15 and 15 at both ends in the width direction and sandwiched between the compression grooves 15 and 15 at both ends (shown in dark color in FIG. 18). See area).

  The dimension in the width direction of the high-rigidity region in the central region Rc is preferably set so as to correspond to the assumed width between the groins. Since the typical dimension of the width of the crotch is generally 15 to 45 mm, in the first embodiment, the width of the high-rigidity region is set to a range of 15 to 45 mm at the position of the vaginal opening facing position Z. In addition, the width of the high-rigidity region changes over a predetermined range before and after the vaginal opening facing position Z in the longitudinal direction, but is maintained within the above range. And if it does in this way, it will become possible to avoid the discomfort between the crotches due to the high rigidity region effectively.

  Desirably, the outer region in the width direction than the high-rigidity region in the central region Rc (that is, the region outside the compression grooves 15 and 15 at both ends in the width direction) is more than the high-rigidity region. The bending rigidity should be small. This is because, when the bending rigidity of the central region Rc is uniformly high over the entire width in the width direction, the central region Rc that is generally set wider than the assumed width between the crotch is sandwiched between the crotch. In addition, there is no escape space with an excessive width in the central region Rc, and as a result, the central region Rc as a whole tilts obliquely with respect to the crotch, resulting in poor adhesion to the crotch.

  Therefore, in the first embodiment, the bending rigidity of the outer region in the width direction (hereinafter referred to as the outer region) is lower than that of the high-rigidity region, and these outer regions are easily bent along the longitudinal direction. Thereby, it is possible to absorb the difference in width dimension between the assumed width between the crotch and the central region Rc.

The difference in bending rigidity between the high-rigidity region and the outer region is preferably larger. In other words, the greater the difference, the more the force when the central region Rc is sandwiched between the crotch is transmitted from the outer region to the high-rigidity region. It becomes difficult to be done. In the first embodiment, as a method of reducing the bending rigidity of the outer region, the basis weight of the pulverized pulp at a position corresponding to the outer region in the pulverized pulp laminate 12a is a small amount of 100 g / m ^2. Thus, the outer region functions effectively as a fold starting point.

  As shown in FIG. 18A, the compression groove 15 in the central region Rc is continuously extended to the front region Ra in front of the central region Rc, whereby the compression groove 15 is formed in the book of the front region Ra. Extending to the joint portion 10g, the rear end edge 10r of the main joint portion 10g and the bending rigidity in the vicinity thereof are also enhanced. However, here, it is extended for the purpose of increasing the bending rigidity in the longitudinal direction, that is, it prevents bending in the longitudinal direction at the rear end edge 10r of the main joining portion 10g and its vicinity. Specifically, as shown in the longitudinal sectional view of the center of the human body in FIG. 18B, when the top absorbent body 20 is pulled up, the pulling force Ft due to the pulling is applied to the rear end edge 10r of the main joint portion 10g. Although acting (see also FIG. 2 and FIG. 13 for the rear edge 10r), if the bending rigidity in the longitudinal direction of the rear edge 10 or its vicinity is small at that time, the longitudinal direction as shown in FIG. 18B This is because the base absorbent body 10 and the top absorbent body 20 have a gap G between the crotch and the adhesiveness is deteriorated.

  Further, as shown in FIG. 18A, at the position before entering the front region Ra from the central region Rc, the interval between the compression grooves 15 and 15 at both ends gradually increases, that is, the width of the high-rigidity region is It gradually spreads toward the front area Ra. The wide width is substantially maintained until the compressed groove 15 is cut off in the main joint portion 10g of the front region Ra. The reason for the widening is that the width of the high-rigidity region is changed to the main joint portion 10g. This is because it is wider than 10 g and protrudes to the outside in the width direction, thereby stabilizing the folding suppressing effect at the main joint portion 10 g.

  In the central region Rc, the number of the compressed grooves is increased from 4 to 5 by the extent that the width of the high-rigidity region increases from around the start of the width of the high-rigidity region to the front region Ra. Therefore, the interval between the compression grooves 15 adjacent to each other in the width direction is kept substantially constant, and the change in bending rigidity is suppressed.

  By the way, a suitable numerical range exists in the magnitude of the bending stiffness in the width direction of the high-rigidity region (hereinafter referred to as a bending stiffness value). This bending stiffness value is measured using, for example, a Gurley type flexibility tester (manufactured by Yasuda Seiki Seisakusho Co., Ltd. (product number 311)).

FIG. 19 to FIG. 20B are explanatory diagrams of the bending rigidity measurement procedure by this testing machine 101. FIG. 19 is a plan view of the test piece 121, and FIGS. 20A and 20B are front views of the test machine 101.
First, an object whose bending stiffness value is to be measured is prepared as a test piece 121 in the form of a rectangular sheet having a length of 38 mm and a width of 25 mm as shown in FIG. Here, the measurement direction of the bending stiffness value has two directions of the longitudinal direction and the width direction, but the direction in which the bending stiffness value is desired to be measured is aligned with the 38 mm length direction of the test piece 121. A rectangular sheet is formed.
Next, the upper end of the 38 mm length of the test piece 121 is fixed to the support 103 of the testing machine 101 in FIG. 20A with a length of 6.3 mm. Here, the testing machine 101 has a pendulum 105 that swings clockwise and counterclockwise with a weight 111 attached to the lower side, and an upper end portion above the fulcrum C105 of the pendulum 105. In addition, the lower end of the test piece 121 is brought into contact with a length of 6.3 mm. Incidentally, attachment positions X1, X2, and X4 of the weight 111 are respectively provided at positions separated by 1 inch, 2 inches, and 4 inches downward from the fulcrum C105.

Next, a weight 111 having an appropriate weight assumed to correspond to the bending rigidity value of the test piece 121 is attached to at least one of the three attachment positions X1, X2, and X4.
Then, as shown in FIG. 20B, the support 103 is moved at a predetermined moving speed in a direction in which the test piece 121 pushes the upper end of the pendulum 105. Then, the pendulum 105 is pushed by the lower end portion of the test piece 121 and slowly rotates about the fulcrum C105, and the lower end of the pendulum 103 also moves on the arc. The upper end of the pendulum 103 is detached from the lower end thereof by being greatly bent. If it does so, the indication value of the scale corresponding to the position of the lower end of the pendulum 105 at that time will be read and recorded.

  Then, the above indicated values are obtained and recorded for both the clockwise direction and the counterclockwise direction in which the test piece 121 pushes the upper end of the pendulum 105.

  Then, finally, the weights M1, M2, and M4 of the weights 111 attached to the attachment positions X1, X2, and X4 and the indicated values ia and ib are substituted into the parameters of the following equation 1, and the bending rigidity value is set. (Mg) is calculated.

Flexural rigidity value (mg)
= (Ia + ib) / 2 × (M1 + 2 × M2 + 4 × M4) /5×9.88 Equation 1
In Formula 1, M1 is the weight (g) of the weight 111 attached to the attachment position X1 of 1 inch from the fulcrum, and M2 is the weight of the weight 111 attached to the attachment position X2 of 2 inches (g M4 is the weight (g) of the weight 111 attached to the attachment position X4 of 4 inches. The numerical value “9.88” at the end of Equation 1 is an intrinsic constant of the testing machine 101.

  Incidentally, since the width of the test piece 121 is 1 inch, this bending stiffness value is a bending stiffness value (mg) at a width of 1 inch.

Here, if a suitable numerical range of the bending stiffness value in the width direction of the high-rigidity region in the central region Rc is described using the bending stiffness value measured by the Gurley-type flexibility tester 101 as an index, the bending stiffness is concerned. The value is preferably 300 (mg) or more. This is because if it is less than 300 (mg), it may break at the center line CL in the width direction when sandwiched between the groins. In addition, there is no definition of the upper limit value in the preferable numerical range, as described above, the width of the high-rigidity region is basically set to substantially the same width corresponding to the assumed width of the crotch. This is because even if the bending rigidity value is too high, there is no sense of incongruity between the groins.
However, if the bending rigidity value in the longitudinal direction becomes 3000 (mg) or more due to the increase in the bending rigidity value in the width direction, the base absorbent body 10 will be stretched against the bending in the longitudinal direction between the crotch. Since this sometimes gives a sense of incongruity, it is desirable to set the bending rigidity value in the longitudinal direction.

  In addition, as described above, it is preferable that the high-rigidity region and the outer region adjacent to the outer side in the width direction of the high-rigidity region have a larger difference in bending rigidity value in the width direction. The difference in bending stiffness value is preferably 200 (mg) or more. And if the difference of the said bending rigidity value is 200 (mg) or more, it will become difficult to transmit reliably the force at the time of the said center area | region Rc being pinched | interposed into a crotch from an outer area | region to a highly rigid area | region.

  In the first embodiment, the actual measurement value of the bending stiffness value in the width direction of the high-rigidity region of the central region Rc is 938 (mg). The actual measurement value of the bending rigidity value in the width direction of the outer region is 327 (mg), and the difference in bending rigidity value in the width direction of these regions is 611 (mg). In addition, these measured values are obtained by applying the test piece 121 actually cut out from the absorbent article 1 as described below to the Gurley-type flexibility tester 101 described above.

Specifically, as the test piece 121 of the former high-rigidity region, the range surrounded by the thick two-dot chain line in FIG. 21 from the central region Rc of the actual absorbent article 1, that is, the vaginal opening facing position Z is the center of the plane A rectangular portion of 1 inch in the longitudinal direction and 38 mm in the width direction was cut out and used. Therefore, as a matter of course, the test piece 121 has substantially the same structure as the base absorbent body 10, that is, includes the top sheet 14, the absorbent base material 12, and the back sheet 30. However, due to the limitation of the sampling range of the test piece 121, the upper end portion and the lower end portion of the test piece 121 include a small area where the basis weight of the pulverized pulp related to the absorbent substrate 12 is 100 g / m ^2. Therefore, the bending rigidity value in the actual high-rigidity region is higher than the above 938 (mg).

In addition, the test piece in the latter outer region was similarly cut out from the central region Rc of the actual absorbent article 1 and cut out a rectangular portion in a range surrounded by a thick two-dot chain line in FIG. In addition, since the sampling range of the test piece 121 is also limited here, the bending rigidity value was measured with a width that can be sampled, and converted to a width of 1 inch. Furthermore, due to the limitation of the collection range, the collected test piece 121 does not include a region where the basis weight of the pulverized pulp according to the absorbent body 12 is 100 g / m ² , and the outer 200 g / m ² is not included. Since it is collected only from the range of m ² , the actual bending stiffness value in the width direction of the outer region is lower than the above-mentioned 327 (mg). Incidentally, since the compressed groove 15 is not formed in the collected test piece 121 and the basis weight of the pulverized pulp is a constant value of 200 g / m ² , the difference in bending rigidity between the width direction and the longitudinal direction is different. There is almost no directionality, so the bending stiffness value in the width direction is replaced by the bending stiffness value in the longitudinal direction.

=== Second Embodiment ===
22A and 22B are explanatory views of the absorbent article 1 according to the second embodiment. 22A is a plan view of the base absorbent body 10, and FIG. 22B is a cross-sectional view taken along the line BB in FIG. 22A. In addition, about FIG. 22A, the surface sheet 14 and the side sheet 40 are shown through.

  In the first embodiment, the compression groove 15 is formed as a rigid element. However, in the second embodiment, as shown in FIG. 22A, a compression recess group including a plurality of dot-shaped compression recesses 52 as a rigid element. The difference is that 53 and 54 are formed. Further, in the first embodiment, the grooved embossing is applied to the top sheet 14 and the absorbent substrate 12 to compress both of them together to form the compressed groove 15. In the second embodiment, as shown in FIG. 22B, the topsheet 14 is not embossed, and only the absorbent base 12 is embossed, whereby only the absorbent base 12 includes the compression recess 52. It is also different in that the compression recess groups 53 and 54 are formed. The other points are almost the same as those in the first embodiment. In the figure, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 22B, each compression recess 52 is formed by compressing the absorbent base material 12 in the thickness direction, and its planar shape is, for example, a circle as shown in FIG. 22A. And these compression recessed parts 52 are mainly formed in center area | region Rc and front area | region Ra.

  In the central region Rc, a plurality of compression recesses 52 are formed with a first dot pattern at the center in the width direction corresponding to the high-rigidity region of the first embodiment, thereby providing a first compression recess group 54. It has been. The first dot pattern is a grid pattern in which the formation pitch Q4 in the width direction is smaller than the formation pitch Q3 in the longitudinal direction. Therefore, according to this pattern, the bending rigidity in the width direction can be increased as compared with the longitudinal direction, and as a result, folding in the width direction can be preferentially suppressed. Incidentally, the reason why priority is given to the suppression of the folding in the width direction in the central region Rc is that the central region Rc faces the crotch, so that it is sandwiched by the crotch and easily bent in the width direction.

  On the other hand, in the front region Ra, a plurality of compression recesses 52 are formed in a region corresponding to the main joining portion 10g with a second dot pattern, and thereby a second compression recess group 53 is provided. The second dot pattern is opposite to the first dot pattern described above, that is, a lattice pattern in which the formation pitch Q1 in the longitudinal direction is smaller than the formation pitch Q2 in the width direction. Therefore, according to this pattern, the bending rigidity in the longitudinal direction can be increased more than in the width direction, and as a result, bending in the longitudinal direction can be preferentially suppressed.

=== Third to Fifth Embodiments ===
FIG. 23A thru | or FIG. 23C are explanatory drawings of the absorbent article 1 which concerns on 3rd thru | or 5th embodiment, and all are the top views of the base absorbent body 10. FIG. In each figure, the range of the main joint portion 10g is shown in a deeply colored manner.

  This is different from the first and second embodiments described above in terms of the formation range, position, and number of the main joining portion 10g. However, the third to fifth embodiments are the same in that the compression groove 15 as a rigid element is formed at least in the central region Rc and the bending rigidity in the width direction is increased. 23A to 23C are schematically shown mainly for the purpose of showing the formation position of the compressed groove 15 in the longitudinal direction, the compressed groove 15 is represented by a straight line as shown in the figure. The curve is not limited and may be a curve as in the first embodiment.

  In the third embodiment shown in FIG. 23A, the main joint portion 10g extends from the front region Ra to the central region Rc, and the rear edge 10r of the main joint portion 10g is substantially between the central region Rc and the rear region Rb. This is an example that matches the boundary BL2. That is, the top absorbent body 20 is joined to the base absorbent body 10 in an inseparable manner in the front region Ra and the central region Rc, and only the portion overlapping the rear region Rb is not joined and moves separately from the base absorbent body 10. It is possible. In this case as well, the compression groove 15 as a rigid element is formed at least in the central portion in the width direction of the central region Rc, and at least the bending rigidity in the width direction of the central portion is enhanced.

  The fourth embodiment in FIG. 23B is an example in which the main joining portion 10g is set to the front end portion 10a and the rear end portion 10b of the base absorbent body 10. That is, only the central portion 20 c in the longitudinal direction of the top absorbent body 20 can be separated and moved without being joined to the base absorbent body 10. In this case as well, the compression groove 15 as a rigid element is formed at least in the central portion in the width direction of the central region Rc, and at least the bending rigidity in the width direction of the central portion is enhanced.

  The fifth embodiment of FIG. 23C is an example in which the main joint portion 10g is set only at the center in the longitudinal direction of the base absorbent body 10. That is, the front end portion 20 a and the rear end portion 20 b in the longitudinal direction of the top absorbent body 20 can be separated and moved without being joined to the base absorbent body 10. In this case as well, the compression groove 15 as a rigid element is formed at least in the central portion in the width direction of the central region Rc, and at least the bending rigidity in the width direction of the central portion is enhanced.

=== Sixth Embodiment ===
In FIG. 24 thru | or FIG. 26, explanatory drawing of the absorbent article 1 of 6th Embodiment is shown. FIG. 24 is a perspective view of the absorbent article 1. FIG. 25 is a plan view of the surface side of the base absorbent body 10, and FIG. 26 is a plan view of the surface side of the top absorbent body 20. In addition, about FIG. 25, the outline of the top absorber 20 is virtually shown by the dotted line.

  In the first embodiment, the top absorbent body 20 and the base absorbent body 10 are permanently joined at the final joined portion 10g so as not to be separated, but in the sixth embodiment, as shown in FIG. It is different in that it can be separated at a portion corresponding to the portion 10g (hereinafter referred to as a joint portion 10k).

  That is, as shown in FIGS. 24 to 26, the planar size of the joint portion 10k, the position in the base absorbent body 10 and the like are the same as those of the main joint portion 10g of the first embodiment described above, but the joint portion 10k. The female material 65 of the mechanical fastener is fixed to the back surface side of the front end portion 20a of the top absorbent body 20 (the front-side sealing portion 25 and the vicinity of the rear side) corresponding to the female material 65. A male material 63 of a mechanical fastener is fixed, whereby the top absorbent body 20 and the base absorbent body 10 are detachable at the joint portion 10k.

  The male material 63 of the mechanical fastener is, for example, a rectangular sheet material with a hook-shaped protrusion on one side, and more preferably, the shape of the protrusion is a mushroom type. This is because if the mushroom type is used, the locking directionality is lost and a high locking force can be exerted evenly in any direction. As a result, even if the top absorbent body 20 is slightly swung back and forth and left and right in the process of pulling up the undergarment 90 after joining the top absorbent body 20 to the base absorbent body 10, it is difficult for the base absorbent body 10 to fall off. Become.

  On the other hand, the female material 65 of the mechanical fastener is, for example, a rectangular sheet material in which a large number of loops are formed on one surface so that the projection of the male material 63 is caught. However, the female member 65 is not an essential component. The reason is that since the top sheet 14 of the base absorbent body 10 is formed of a nonwoven fabric, the male material 63 of the top absorbent body 20 can be expected to have a certain degree of locking force even with the nonwoven fabric. However, as a nonwoven fabric for the surface sheet 14, a nonwoven fabric having a good texture is often used from the viewpoint of touchability, and in that case, the entanglement strength of the constituent fibers of the nonwoven fabric is weakened and sufficient bonding strength is ensured. There is a possibility that it cannot be done. Therefore, desirably, the female member 65 is fixed to the joint portion 10k of the base absorbent body 10 as in the sixth embodiment described above.

  Further, it is preferable to use a female member 65 having a color tone different from that of the top sheet 14 so that the joint portion 10k is visually clear. Then, the top absorbent body 20 and the base absorbent body 10 When joining the two, it is possible to prevent a situation in which the joining position is shifted and sufficient joining strength cannot be secured.

  In the sixth embodiment, the female material 65 is provided on the base absorbent body 10 side, and the male material 63 is provided on the top absorbent body 20 side.

  Furthermore, without using the mechanical fasteners 65 and 63, an adhesive is applied to at least one of the joint portion 10k and the front end portion 20a, and the application area of the adhesive is made of a release paper coated with a release agent. It may be covered and bonded before the user uses the absorbent article 1 by peeling the release paper to expose the adhesive.

  By the way, in such a separable configuration, the user of the absorbent article 1 may be allowed to perform a joining operation between the base absorbent body 10 and the top absorbent body 20, and in that case, provided to the user. As a packaging form at the time of being done, the following two types of packaging forms can be illustrated.

  The first packaging form is substantially the same as the first embodiment of FIGS. 16A to 16D. In other words, the top absorbent body 20 is folded together in a folded state in a state where the top absorbent body 20 is superposed on the base absorbent body 10, and is wrapped together with a single packaging sheet 36. However, at the time of packaging, the base absorbent body 10 and the top absorbent body 20 may or may not be joined at the joint portion 10k. Then, the package body in which the top absorbent body 20 and the base absorbent body 10 are packaged together in this way is collected in a predetermined number and accommodated in one bag, and the bag is supplied to the market as a minimum unit for sale. Is done.

  On the other hand, a 2nd packaging form is an aspect which wraps the base absorber 10 and the top absorber 20 separately, as shown in FIG.25 and FIG.26. That is, as shown in FIG. 25, with respect to the base absorbent body 10, only the base absorbent body 10 is placed on the packaging sheet 36, and the base absorbent body 10 together with the packaging sheet 36 is in a predetermined folding position P1, P2, P3. In that state, the outer edge in the width direction of the packaging sheet 36 is adhesively sealed along the longitudinal direction to form a bag, and the base absorbent body 10 is accommodated in the package and packaged. Is done. On the other hand, as shown in FIG. 26, the top absorbent body 20 is also placed on a separate packaging sheet 37 from the above, and the top absorbent body 20 together with the packaging sheet 37 has a predetermined shape. It is folded in four at the folding positions P1, P2, and P3, and in that state, the outer edge in the width direction of the packaging sheet 37 is adhesively sealed along the longitudinal direction to form a bag, and the top absorbent is absorbed therein. The body 20 is accommodated and packaged. Incidentally, the folding positions P1, P2, and P3 are the same as the folding positions P1, P2, and P3 of the first embodiment, that is, the top absorbent body 20 has the pulverized pulp at the folding positions P1, P2, and P3. The basis weight is smaller than that of the surrounding portion, and it is easy to bend (see FIG. 14).

Then, the package of the base absorbent body 10 and the package of the top absorbent body 20 that are packaged in this way are each combined into a predetermined number and accommodated in separate bags to generate two containers. Furthermore, these two containers are accommodated together in one bag, and the bag is supplied to the market as a minimum unit for sale.
However, the minimum unit of sale is not limited to this. For example, the top absorbent body 20 and the base absorbent body 10 may be sold separately using the container as the minimum unit of sale. By the way, when sold separately like this, there are the following advantages. That is, it is not necessary to separately store the absorbent articles for daytime and night use, and the housing inventory of the absorbent articles can be reduced. Details are as follows. While only the base absorbent body 10 is used as an absorbent article for daytime with less menstrual blood, the top absorbent body 20 is joined to the base absorbent body 10 when used for nighttime with much menstrual blood. . In other words, the absorbent article for daytime can be transformed and used for nighttime, thereby reducing the housing inventory. In addition, when the top absorbent body 20 has sufficiently absorbed menstrual blood after being used for a predetermined time, it is possible to replace only the top absorbent body 20 without replacing the base absorbent body 10, As the base absorber 10 is replaced less frequently, dust can be reduced.

  By the way, as a material of the packaging sheet 37 for the top absorbent body 20 used in the second packaging form shown in FIG. 26, for example, an SMS nonwoven fabric (a three-layer structure in which a melt-blown nonwoven fabric is sandwiched between upper and lower spunbond nonwoven fabrics) Non-woven fabric). If this is a non-woven fabric, the male material 63 of the mechanical fastener can be effectively locked between the fiber gaps. Therefore, the male material 63 and the locking of the both ends 20a, 20b in the longitudinal direction of the top absorbent body 20 This is because the both ends 20a and 20b can be locked and fixed to the packaging sheet 37 by the male material of the member 27, and the positional deviation in the width direction of the top absorbent body 20 when folded in four can be effectively suppressed. By the way, the reason why it is better to suppress the positional deviation in the width direction is that when the user unwraps the packaging, if the top absorbent body 20 is bent with respect to the packaging sheet 37, the visual impression becomes worse. It is.

  Among the foldings at the first to third folding positions P1, P2, and P3, the folding that is most likely to occur is the folding at the first folding position P1 that is performed first. Therefore, preferably, the first folding position P1 is embossed or the like at a position sandwiched with the locking member 27 with respect to the longitudinal direction to form a temporary fixing portion 71, whereby the rear end of the top absorbent body 20 is The end 20b may be pressure-bonded to the packaging sheet 37. In this way, since the first folding position P1 is sandwiched between the locking member 27 and the temporary fixing portion 71, the displacement of the top absorbent body 20 during folding is effectively suppressed.

  In the case where an adhesive is used instead of the mechanical fasteners 63 and 65 for the front end 20a of the top absorbent body 10, a sheet of a material from which the adhesive is easily peeled is used as the packaging sheet 37, or the front end It is preferable to arrange a sheet of a material from which the above-mentioned pressure-sensitive adhesive easily peels in correspondence with the application region of the pressure-sensitive adhesive 20a. In this case as well, the front end portion 20a of the top absorbent body 20 is temporarily joined to the packaging sheet 37 by the adhesive force of the adhesive.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The deformation | transformation as shown below is possible.

  In the above-described embodiment, the compression groove 15 and the compression recess groups 53 and 54 formed in the base absorbent body 10 are illustrated as the rigid elements. However, the width direction of the base absorbent body 10 as the “main part of the absorbent article” is illustrated. However, the present invention is not limited to this as long as it increases the bending rigidity. For example, a sheet material, a plate material, a rod material, a wire material, or the like having an appropriate rigidity made of resin, metal, or the like may be provided along the width direction.

  In the above-described embodiment, the compression groove 15 as the rigid element is formed along the longitudinal direction, but the direction is not limited to this. For example, a plurality of compressed grooves 15 along the width direction may be formed side by side in the longitudinal direction.

  In the above-described embodiment, as an application pattern of the hot melt adhesive to the main joint portion 10g in the base absorbent body 10, a pattern in which a plurality of straight lines along the longitudinal direction are arranged in the width direction as illustrated in FIG. 18A is exemplified. However, the application pattern is not limited to this. For example, a pattern in which a plurality of spiral curves continuous in the longitudinal direction are arranged in the width direction may be used, or a pattern in which a plurality of straight lines along the width direction are arranged in the longitudinal direction may be used. A pattern in which a plurality of spiral curves are arranged in the longitudinal direction may be used.

  In the above-described embodiment, as illustrated in FIG. 9B, the base absorbent body 10 as the “main part of the absorbent article” is exemplified by the configuration including the absorbent body 12 made of the pulverized pulp laminate 12a and the like. This is not a limitation. For example, it is good also considering what removed the said absorber base material 12 from the structure of the above-mentioned base absorber 10 as a "main part of an absorbent article."

  In the above-described embodiment, the base absorbent body 10 includes the side sheet 40 for forming the leak-proof wall 46, but the side sheet 40 is not an essential configuration and may be omitted. When the side sheet 40 is not provided, the top sheet 14 is formed so as to extend outward in the width direction instead of the side sheet 40, and the outer edge thereof is hot with the outer edge in the width direction of the back sheet 30. You may join by a melt adhesive etc.

  In the above-described embodiment, the wing portion 32 is provided, but the wing portion 32 is not an essential configuration and may be omitted.

  Although the sanitary napkin is shown as the absorbent article 1 in the above-described embodiment, the present invention is not limited to this as long as it absorbs liquid excreted from the human body.

It is a top view of the surface side of the absorptive article 1 of a deployment state. It is II-II sectional drawing in FIG. 1 is a perspective view of an absorbent article 1. FIG. It is a perspective view of the absorbent article 1 for demonstrating the mode at the time of use. It is the same perspective view. It is the same perspective view. 3 is a plan view of the surface side of the base absorbent body 10. FIG. It is a top view of the back side. 9A to 9C are an AA sectional view, a BB sectional view, and a CC sectional view, respectively, in FIG. It is a basic-weight distribution map of the pulverized pulp which concerns on the pulverized pulp laminated body 12a. It is a top view of the top absorber 20 of the expansion | deployment state. 12A to 12D are an AA sectional view, a BB sectional view, a CC sectional view, a DD sectional view, and an EE sectional view, respectively, in FIG. It is explanatory drawing of this joining by adhesion | attachment. 3 is a basis weight distribution diagram of pulverized pulp according to a pulverized pulp laminate 22. FIG. FIG. 15A thru | or FIG. 15D is explanatory drawing of a mode that the absorbent article 1 is packaged. 16A to 16D are plan views showing a state where the absorbent article 1 is folded in four. FIG. 17A and FIG. 17B are schematic views for explaining problems during use of the absorbent article 1. 3 is a plan view of the surface side of the base absorbent body 10. FIG. It is explanatory drawing of the bending of the longitudinal direction which may arise in the rear-end edge 10r of this joined part 10g, and its vicinity part. 2 is a plan view of a test piece 121 of a Gurley type flexibility tester 101. FIG. 20A and 20B are front views of the testing machine 101. FIG. 3 is a plan view of the base absorbent body 10 showing a sampling position of a test piece 121. FIG. It is a top view of the base absorber 10 which concerns on the absorbent article 1 of 2nd Embodiment. It is BB sectional drawing in FIG. 22A. FIG. 23A thru | or FIG. 23C is explanatory drawing of the absorbent article 1 which concerns on 3rd thru | or 5th embodiment, respectively. It is a perspective view of the absorbent article 1 which concerns on 6th Embodiment. 3 is a plan view of the surface side of the base absorbent body 10. FIG. 3 is a plan view of the top absorbent body 20 on the surface side. FIG.

Explanation of symbols

1 absorbent articles,
10 Base Absorber (Main Body), 10a Front End, 10b Rear End,
10e rear edge, 10g main joint part (joint part), 10r rear edge,
10k joint part, 12 absorber base material,
12a ground pulp laminate (second liquid absorbing member), 14 surface sheet,
15 compression groove (rigid element), 15a low compression part, 15b high compression part, 15e front end,
20 top absorber (absorber), 20a front end (one end),
20b rear end (other end), 20c center,
22 ground pulp laminate (liquid absorbing member), 23 intermediate sheet, 24 shape-retaining sheet,
24c part, 24d part, 24e end part, 25 front side sealing part,
26 rear sealing portion, 26a knob, 27 locking member, 28 holes,
30 back sheet, 30a front end, 30b rear end, 30c back,
31 Adhering part for slip prevention (adhering part), 32 Wing part, 33 Adhering part for slip prevention,
34 protective sheet, 35 protective sheet, 36 packaging sheet, 36c outer edge,
37 Packaging sheet, 38 Lead tape, 40 Side sheet, 44 Fixing part,
46 end (leakproof wall), 48 elastic member, 51 leakproof sheet, 52 compression recess,
53 first compression recess group, 54 second compression recess group,
63 Male material of mechanical fastener, 65 Female material of mechanical fastener,
71 Temporary fixing part, 90 Underwear, 101 Testing machine, 103 Support, 105 Pendulum,
111 weights, 121 specimens, CL centerline,
Z Estimated position facing the vaginal opening (position corresponding to the face of the human body excretion opening),
Ra front region, Rb rear region, Rc central region,
BL1 boundary, BL2 boundary, C105 fulcrum,

Claims (6)

A main body of the absorbent article;
An absorbent body that has a liquid absorbing member that absorbs liquid and is superposed on the main body portion, and has an end portion and another end portion in the longitudinal direction, and the one end portion is a longitudinal portion of the main body portion at a joint portion. An absorber that is joined to one end portion in the direction, and the other end portion is movable as a free end with the one end portion of the absorber as a fulcrum ;
A rigidity element provided in the main body to increase the rigidity of the main body ;
With
The main body includes a central region of a predetermined range including a position corresponding to the face of the human body excretion port in a longitudinal direction of the main body, a front region located on the one end side of the main body from the central region, A rear region located on the opposite side of the one end side of the main body from the central region,
The joining portion is provided in the front region, and a portion of the absorber that overlaps the central region and a portion that overlaps the rear region are separated from the main body portion as the free end. Is movable
The main body has a second liquid absorbing member that absorbs liquid,
The rigid element is a compression groove formed by compressing the second liquid absorbing member along the longitudinal direction of the main body portion,
A plurality of the compressed grooves are formed side by side in the width direction of the main body,
In the central region, of the plurality of compressed grooves, the distance between the compressed grooves at both ends in the width direction of the main body is narrower than the width of the absorber.
In the front region, of the plurality of compressed grooves, a distance between the compressed grooves at both ends in the width direction of the main body is wider than the width of the joint portion.
An absorbent article characterized by the above. The absorbent article according to claim 1 ,
The absorbent article according to claim 1 , wherein, in the width direction, the rigidity of both side portions of the central portion is lower than the rigidity of the central portion where the rigid element is provided . The absorbent article according to claim 2 ,
The second liquid absorbing member is a pulverized pulp laminated with a predetermined basis weight distribution,
The absorbent article, wherein the basis weight of the pulverized pulp is smaller in the widthwise portions of the central portion than in the central portion. The absorbent article according to claim 2 or 3 ,
The size of the central portion in the width direction is 15 to 45 mm. The absorbent article according to any one of claims 1 to 4 ,
The said rigidity is bending rigidity regarding the said width direction, The absorbent article characterized by the above-mentioned. An absorbent article according to any one of claims 1 to 5 ,
In the bonded portion, the absorbent article is detachably bonded to the main body portion.