JP2005102864A - Absorptive article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorptive article excellent in absorptivity and a wearing feeling. <P>SOLUTION: A sheet material having rigidity based on JIS P8143 of ≥5.5 (cm<SP>3</SP>/100) and ≤18.2 (cm<SP>3</SP>/100) is folded, an absorbent 40 for which a plurality of sheet material layers are laminated is interposed between a top sheet 30 provided on the side of a surface to be in contact with a human body and a back sheet 20 provided on the opposite surface side of the surface to be in contact with the human body, and a napkin 10 as the absorptive article is constituted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an absorbent article.

Conventionally, as absorbent articles such as sanitary napkins, panty liners, incontinence pads, etc., an article having an absorbent body interposed between a top sheet and a back sheet has been known. A highly water-absorbent resin is mixed in a fibrous base material made of hydrophilic fibers such as those that improve the absorbability of body fluids such as menstrual blood and urine (for example, see Patent Document 1). .
JP 2002-224161 A

  However, in the case of the above-mentioned Patent Document 1, although it is possible to reduce the discomfort of the wearer of the absorbent article by improving the absorbability of the bodily fluid in the absorber and reducing the return of the bodily fluid, Flexibility and elasticity cannot be said to be sufficient, which may lead to a feeling of strangeness when the absorbent article is worn, and the wearer's feeling of wearing the absorbent article is not always good.

  An object of the present invention is to provide an absorbent article having good absorbability and good wearing feeling.

In order to solve the above problems, the invention described in claim 1
A top sheet (30) provided on the contact surface side with the human body, a back sheet (20) provided on the side opposite to the contact surface with the human body, and the top sheet and the back sheet are interposed. In an absorbent article (for example, napkin 10) provided with an absorber (40 etc.),
The absorber stiffness in conformity with JIS P8143 is 5.5 (cm ^3/100) or 18.2 (cm ^3/100) in which are sheet material is folded below, by laminating a plurality of sheet material layer It is characterized by comprising.

According to the invention of claim 1, the absorbent body provided in the absorbent article is a thin sheet material because one sheet material is folded and a plurality of sheet material layers are laminated. Moreover, a thick absorber can be easily formed by folding it. In this way, stacking a plurality of sheet material layers by folding a large sheet material is easier in the manufacturing process than stacking a plurality of sheet materials of the same shape to form a thick absorber. be able to.
Further, in the absorbent body, the folded sheet material tries to open to restore the shape before being folded by the repulsive force based on the stiffness of the sheet material. This repulsive force becomes the elastic force of the absorber. Sheet material according to the present invention, since the stiffness in conformity with JIS P8143 is a 5.5 (cm ^3/100) or 18.2 (cm ^3/100) or less, the repulsive force based on a stiffness strength sheet material having the Appropriate elasticity and flexibility are imparted to the absorber based on the repulsive force, and the cushioning property of the absorber is improved.
Therefore, an absorbent article provided with such an absorbent body can be made into an absorbent article with good cushioning properties and good wearing feeling.

In addition, since this absorbent body is formed by folding a sheet material and laminating a plurality of sheet material layers, the body fluid absorbed by the human body side (front side) sheet material layer is caused by a capillary phenomenon between the sheet material layers. It can be said that it has good body fluid absorption performance because it can be moved and quickly moved and absorbed into the sheet material layer on the back side.
Therefore, an absorbent article provided with such an absorbent body can be an absorbent article with good body fluid absorbability.

The invention according to claim 2 is the absorbent article according to claim 1,
The absorbent body is characterized in that each side portion (40a and the like) at both ends in the width direction of the sheet material is folded back to the center side of the sheet material.

According to the second aspect of the invention, the absorber has the same effect as that of the first aspect of the invention, and the absorber is folded back at the center side of the sheet material at each side of the sheet material in the width direction. Since the two sheet material layers are laminated, the cushioning property suitable for the absorbent body is given by the repulsive force that the side portions of the sheet material try to open to both ends in the width direction of the sheet material. In addition, the absorbent body has suitable body fluid absorption performance by the two sheet material layers.
Therefore, an absorbent article provided with such an absorbent body can be made into an absorbent article having good body fluid absorbability and good wearing feeling.

The invention according to claim 3 is the absorbent article according to claim 1,
The absorbent body is characterized in that each side portion at both ends in the width direction of the sheet material is folded back to the center side of the sheet material, and the other side portion is overlapped with one side portion.

According to invention of Claim 3, while exhibiting the effect | action similar to invention of Claim 1, an absorber folds each side part of the width direction both ends of a sheet | seat material to the center side of a sheet | seat material, Since the other side part is overlapped with the side part of this sheet and the three sheet material layers are laminated, the cushioning property suitable for the absorbent body is given by the repulsive force that the side part of the sheet material tries to open. In addition, the three sheet material layers make the absorbent body have suitable body fluid absorption performance.
Therefore, an absorbent article provided with such an absorbent body can be made into an absorbent article having good body fluid absorbability and good wearing feeling.

Invention of Claim 4 is an absorbent article as described in any one of Claims 1-3,
The absorber is bent at a substantially central side along the longitudinal direction of the sheet material so as to be convex toward the top sheet side.

  According to the invention described in claim 4, the sheet material has the same effect as that of any one of claims 1 to 3, and the absorber is convex toward the top sheet side. Since it is bent at substantially the center side along the longitudinal direction, the fitting property between the ridge (convex ridge) portion of the absorbent body formed by bending and the crotch region to which the absorbent article is attached is improved. The wearing feeling of the absorbent article is further improved.

The invention according to claim 5 is the absorbent article according to any one of claims 1 to 4,
The absorber includes a predetermined interlayer member between the sheet material layers in which the sheet material is folded and laminated.

According to invention of Claim 5, while exhibiting the effect | action similar to the invention as described in any one of Claims 1-4, an absorber is between the sheet material layers by which the sheet material was folded and laminated | stacked. Moreover, since the predetermined interlayer member is provided, the properties and functions of the interlayer member can be imparted to the absorbent body and the absorbent article including the absorbent body.
For example, if the interlayer member is a cushioning material, the cushioning property of the absorbent body can be improved, and the wearing feeling of the absorbent article comprising this absorbent body can be made better, and the interlayer member can be a moisture absorbent material. For example, the body fluid absorption performance of the absorber is improved, and the body fluid absorption performance of an absorbent article including the absorber is improved.

According to the invention of claim 1, the absorbent body provided in the absorbent article is a thin sheet material because one sheet material is folded and a plurality of sheet material layers are laminated. Moreover, a thick absorber can be easily formed by folding it. In this way, stacking a plurality of sheet material layers by folding a large sheet material is easier in the manufacturing process than stacking a plurality of sheet materials of the same shape to form a thick absorber. be able to.
Further, in the absorbent body, the folded sheet material tries to open to restore the shape before being folded by the repulsive force based on the stiffness of the sheet material. This repulsive force becomes the elastic force of the absorber. Sheet material according to the present invention, since the stiffness in conformity with JIS P8143 is a 5.5 (cm ^3/100) or 18.2 (cm ^3/100) or less, the repulsive force based on a stiffness strength sheet material having the Appropriate elasticity and flexibility are imparted to the absorber based on the repulsive force, and the cushioning property of the absorber is improved.
Therefore, an absorbent article provided with such an absorbent body can be made into an absorbent article with good cushioning properties and good wearing feeling.

In addition, since this absorbent body is formed by folding a sheet material and laminating a plurality of sheet material layers, the body fluid absorbed by the human body side (front side) sheet material layer is caused by a capillary phenomenon between the sheet material layers. It can be said that it has good body fluid absorption performance because it can be moved and quickly moved and absorbed into the sheet material layer on the back side.
Therefore, an absorbent article provided with such an absorbent body can be an absorbent article with good body fluid absorbability.

According to the second aspect of the invention, the absorber has the same effect as that of the first aspect of the invention, and the absorber is folded back at the center side of the sheet material at each side of the sheet material in the width direction. Since the two sheet material layers are laminated, the cushioning property suitable for the absorbent body is given by the repulsive force that the side portions of the sheet material try to open to both ends in the width direction of the sheet material. In addition, the absorbent body has suitable body fluid absorption performance by the two sheet material layers.
Therefore, an absorbent article provided with such an absorbent body can be made into an absorbent article having good body fluid absorbability and good wearing feeling.

According to invention of Claim 3, while exhibiting the effect | action similar to invention of Claim 1, an absorber folds each side part of the width direction both ends of a sheet | seat material to the center side of a sheet | seat material, Since the other side part is overlapped with the side part of this sheet and the three sheet material layers are laminated, the cushioning property suitable for the absorbent body is given by the repulsive force that the side part of the sheet material tries to open. In addition, the three sheet material layers make the absorbent body have suitable body fluid absorption performance.
Therefore, an absorbent article provided with such an absorbent body can be made into an absorbent article having good body fluid absorbability and good wearing feeling.

  According to the invention described in claim 4, the sheet material has the same effect as that of any one of claims 1 to 3, and the absorber is convex toward the top sheet side. Since it is bent at substantially the center side along the longitudinal direction, the fitting property between the ridge (convex ridge) portion of the absorbent body formed by bending and the crotch region to which the absorbent article is attached is improved. The wearing feeling of the absorbent article is further improved.

According to invention of Claim 5, while exhibiting the effect | action similar to the invention as described in any one of Claims 1-4, an absorber is between the sheet material layers by which the sheet material was folded and laminated | stacked. Moreover, since the predetermined interlayer member is provided, the properties and functions of the interlayer member can be imparted to the absorbent body and the absorbent article including the absorbent body.
For example, if the interlayer member is a cushioning material, the cushioning property of the absorbent body can be improved, and the wearing feeling of the absorbent article comprising this absorbent body can be made better, and the interlayer member can be a moisture absorbent material. For example, the body fluid absorption performance of the absorber is improved, and the body fluid absorption performance of an absorbent article including the absorber is improved.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a developed view of an absorbent article to which the present invention is applied, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. Drawing 3 is an explanatory view of an absorber with which an absorptive article is provided.

A sanitary napkin (hereinafter referred to as “napkin”) 10 as an absorbent article shown in FIGS. 1 and 2 is provided on the contact surface side with a human body, and allows a body fluid such as menstrual blood or a cage to pass through quickly. A liquid top sheet 30, a liquid-impervious back sheet 20 made of a polyethylene sheet or the like provided on the side opposite to the contact surface with the human body, and the back sheet 20 and the top sheet 30 are interposed. And the absorber 40.
Around the absorbent body 40 of the napkin 10, the back sheet 20 and the top sheet 30 extending around the absorbent body 40 are bonded by an adhesive such as hot melt or heat seal so that the edge of the napkin 10 is aligned. Bonded by means.

The back sheet 20 is formed of a sheet material having at least water shielding properties such as polyethylene. In addition, it is preferable that the sheet material has moisture permeability from the viewpoint of preventing stuffiness, and as the sheet material having the water barrier property and moisture permeability, an inorganic filler is melt-kneaded in an olefin resin such as polyethylene or polypropylene. Then, after forming the sheet, a microporous sheet material obtained by stretching in a uniaxial or biaxial direction is suitably used.
In addition, one or a plurality of adhesive layers (not shown) are formed on the outer surface of the back sheet 20 so that the napkin 1 can be fixed to the underwear when worn on the body.

The top sheet 30 is formed of a perforated or non-porous nonwoven fabric, a porous plastic sheet, or the like. As the raw material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. In addition, as a method for producing the nonwoven fabric, a known method can be appropriately used. For example, the nonwoven fabric is obtained by a spunlace method, a spunbond method, a thermal bond method, a melt blow method, a needle punch method, or a combination of these methods. Can be manufactured.
When a large number of through holes are formed in the top sheet 30, body fluid such as menstrual blood and urine is absorbed more quickly, and the dry touch property is excellent.

Absorbent body 40 absorbs body fluid, and pulp, chemical fiber, SAP (Super Absorbent Polymer), which is a highly water-absorbent resin, and the like are mixed and mixed at a predetermined ratio to fold a plurality of sheets. It is formed by laminating sheet material layers.
In this embodiment, as shown in FIGS. 2 and 3, the absorber 40 has the side portions 40 a at both ends in the width direction of the sheet material folded back to the center side of the sheet material, and the side portion at the approximate center of the sheet material. The sheet material layer is folded so that the end portions of 40a are brought into contact with each other, and is formed into a C-fold having a substantially C shape in cross section to form a two-layer sheet material layer. A single air layer is formed between the two sheet material layers.

In the absorbent body 40, the side portion 40a of the folded sheet material tends to open outward in the width direction of the sheet material in order to restore the shape before being folded by a repulsive force based on the stiffness of the sheet material. This repulsive force becomes the elastic force of the absorber 40. When the repulsive force based on the stiffness of the sheet material has an appropriate strength, appropriate elasticity and flexibility are imparted to the absorber 40 based on the repulsive force, and the cushioning property of the absorber 40 is improved.
In addition, as a sheet | seat material used for the absorber 40, the thing according to JISP8143 is 5.5 (cm < ³ > / 100) or more and 18.2 (cm < ³ > / 100) or less.
If stiffness is a value lower than 5.5 (cm ^3/100), stiffness strength to be restored to the shape before the sheet material is folded, since a weak repulsive force, cushioning of the absorber 40 is not significantly improved . Also, when the stiffness is higher than 18.2 (cm ^3/100), the stiffness strength, repulsive force is too strong, it becomes difficult to fold in the production process of the absorber 40 (napkin 10) the sheet material issues In addition, since the elastic force in the absorbent body 40 is too strong, there arises a problem that the feel of the absorbent body 40 becomes hard.
Incidentally, stiffness of more preferred range according to JIS P8143 of the sheet material used in absorbent body 40 is 13.0 (cm ^3/100) or 14.4 (cm ^3/100) or less.

If the sheet material has such stiffness and stiffness, the absorbent body 40 formed by folding the sheet material has suitable cushioning properties.
Thus, the napkin 10 provided with the absorber 40 excellent in cushioning property, flexibility, and elasticity functions as a napkin with a good wearing feeling.

  Further, in the absorbent body 40 in which the sheet material is C-folded in a substantially C shape in cross section, the bent end portion 40b is a crotch portion (root of the crotch) at the crotch portion where the napkin 10 is attached. Although it will be rubbed, the strength of the absorber 40 in the thickness direction is increased because the edge (bent end portion 40b) of the absorber 40 is bent and folded in this manner, so that the absorber 40 increases in strength. It becomes difficult to twist.

In addition, the absorbent body 40 is formed by folding one sheet material and laminating two sheet material layers. Therefore, even if a thin sheet material is folded, it is easily absorbed by thick absorption. The body can be formed. In this way, stacking a plurality of sheet material layers by folding a large sheet material is easier in the manufacturing process than stacking a plurality of sheet materials of the same shape to form a thick absorber. be able to.
In addition, when using a material in which the sheet member, which is the material of the sheet material, is wound in a roll shape, rather than using a thick sheet member, a thin sheet member is used, and the sheet material is folded and laminated to absorb thick material. By forming the body, the number of sheet members wound per material can be increased, which is preferable because the operation efficiency is improved.

  Here, the pulp contained in the absorbent body 40 (sheet material) is loosened by mechanically and chemically treating a plant such as wood to separate cellulose fibers and suspend them in water or into a cardboard shape. It is a thing, and cellulose, hemicellulose, and lignin are three main components, and also contains a resin, a pigment | dye, a neutral substance, etc. The types of pulp can be broadly classified according to raw materials: softwood pulp (N wood, pine, etc.), hardwood pulp (L wood, beech, etc.), non-wood pulp (kenaf, bagasse, cotton, etc.), deinked waste paper pulp (DIP) and so on. Furthermore, there are mechanical pulps that are classified according to the pulp production method and mechanically crushed and chemical pulps that are produced using chemicals such as sulfurous acid and sulfate. Since the pulp is originally hydrophilic and porous, it is rich in water absorption, and there are many types of pulp depending on the combination of raw materials and production methods. Therefore, it is desirable to select and use an appropriate pulp.

Chemical fiber is a fiber made by chemically synthesizing raw materials such as coal and petroleum, or by chemically processing natural fibers. For example, a synthetic fiber having a core-sheath structure made of polyethylene on the outside and polypropylene on the inside can be used as the chemical fiber, but other than this, a polyamide fiber such as nylon or aramid, or a polyester such as PET fiber or PTT fiber. Chemical fibers such as fibers, acrylic fibers, and polyolefin fibers may be used as appropriate. Moreover, you may use chemical fiber like intac (brand name) which is the fiber which hydrophilized the synthetic fiber.
By adding not only pulp but also chemical fibers to the sheet material, the bonding strength between the fibers in the sheet is increased, and it becomes highly resistant to external forces accompanying the movement of the wearer and the presence of chemical fibers. Thus, when heated, the chemical fiber dissolves and acts as an adhesive. It is known that chemical fibers, for example, polypropylene dissolves at 150 ° C. or higher, and dissolves at around 400 ° C. even if the melting temperature is high. Due to the characteristics of this chemical fiber, it can be fused by heat sealing or the like without using an adhesive such as hot melt, which is gentle to the human body and can reduce the cause of rash.
In addition, by adding chemical fibers to the sheet material, it becomes possible to improve the cushioning properties in the thickness direction of the sheet material, and both performances are achieved while balancing the absorbability by pulp and SAP and the cushioning properties by chemical fibers. Can be raised.

SAP has a function of gelling and confining absorbed moisture by binding water molecules between molecules of its own three-dimensional network structure. Specifically, SAP is, for example, starch-polyacrylonitrile hydrolyzate, starch-polyacrylate cross-linked product, carboxyl methyl cellulose, saponified vinyl acetate-methyl acrylate copolymer, polyacrylic acid soda cross-linked product, etc. Can be used.
Usually, the absorption capacity of cotton, pulp, sponge, etc. due to “capillary phenomenon” is about 20 times its own weight, whereas SAP can absorb several hundred to 1000 times its own weight. In the SAP, water molecules are held in a form that is tightly held down by hydrogen bonds in a fine mesh of polymer stretched vertically and horizontally. Since water molecules are bound inside the SAP, even if pressure is applied by actions such as squeezing or pushing, the SAP does not spout water.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to these examples.

As shown in Table 1, the sheet material 1 of Example 1 and the sheet material 2 of Example 2 used for the absorber 40 are configured by overlapping the first to fifth fiber layers. The first and third layers are a mixed layer of chemical fibers (polyethylene / polypropylene) and pulp, the second layer is a SAP layer, the fourth layer is a chemical fiber layer made of 1.7 dtex (polypropylene / polyethylene), and the fifth layer Is a carrier layer made of crepe paper. Moreover, the sheet material 3 of Example 3, the sheet material 4 of Example 4, and the sheet material 5 of Comparative Example 1 have a single-layer structure in which the fibers are mixed. In addition, the mixing and blending ratio of each fiber in Table 1 are shown in terms of basis weight (g / m ² ).

For sheet material 5 from the sheet material 1 having such a composition, JIS P8143 in accordance with stiffness (cm ^3/100) and with measured using a Clark stiffness tester, the cushioning of each sheet member KES compression tester (KES-G5, manufactured by Kato Tech Co., Ltd.). In addition, as the measurement of the cushioning property, the cushioning property in the thickness direction of each sheet material and one sheet (one layer) and the cushioning property in the thickness direction of the C-folded sheet shown in FIG. 3 were measured. When the sheet material is C-folded, the sheet material 1 and the sheet material 2 are folded so that the first layer is on the outer side (front side) and the fifth layer is on the inner side.
The measurement conditions of the cushioning property by this KES compression tester are shown below.
・ SENS (recording sensitivity); 2
・ SPEED RANGE; 0.01 (cm / sec)
・ DEF sensitivity; 5
・ STROKE SET; 5.0
Upper limit load: 50 (gf / cm ² )

As apparent from Table 1, the sheet material 4 with the sheet material 3 of Example 3 Example 4, stiffness pursuant to JIS P8143, respectively (cm ^{3/100) is, 5.5 (cm 3/100)} , a 18.2 (cm ^3/100), it can be said to have a suitable stiffness (cm ^3/100). The cushioning property [C ₂ ] of the sheet material 3 and the sheet material 4 which are C-folded is about 1.5 times the cushioning property [C ₁ ] of one sheet, and the cushioning property is good by C-folding. It can be seen that it has improved.

As is apparent from Table 1, the sheet material 2 between the sheet material 1 of Example 1 Example 2 stiffness pursuant to JIS P8143, respectively (cm ^3/100) is, 13.0 (cm ^3/100 ), a 14.4 (cm ^3/100), it can be said to have a more suitable stiffness to (cm ^3/100). And the cushioning properties of the sheet material 1 and the sheet material 2 which are C-folded are 56.0% and 55.5%, respectively, which are within a range of 50 to 60% which is a preferable cushioning property range. It turns out that it has cushioning properties. In addition, the cushioning property [C ₂ ] of the sheet material 1 and the sheet material 2 which are C-folded is approximately twice that of the cushioning property [C ₁ ] of one sheet, and the cushioning property is improved by C-folding. You can see that
Sheet material 1 contains 10.2% of chemical fiber (including intac) in total weight 137 (g / m ² ), and sheet material 2 contains chemical fiber in total weight 136 (g / m ² ). 50.0% (including intac).
Thus, the sheet material during the entire basis weight, the chemical fiber by containing 10-50%, suitable stiffness (cm ^3/100), it can be said that will have a cushioning property.

On the other hand, the sheet material 5 in Comparative Example 1, JIS P8143 in accordance with stiffness (cm ^3/100) is a ^{34.4 (cm 3/100),} 18.2 a (cm ^3/100) higher stiffness Therefore, since the stiffness and repulsive force when folding the sheet material are too strong, it is difficult to fold the sheet material and form a plurality of sheet material layers. Moreover, the tactile sensation of the absorbent body 40 when the sheet material is C-folded becomes hard.

Then, using a sheet material 2 stiffness pursuant to JIS P8143 (cm ^3/100) and cushioning properties are good and tested for repeatedly absorber performance fluid.
The test method is to inject 1.5 cc of equine blood as body fluid into the surface of the sheet material from the top of the tube (height 100 mm, diameter 25 mm), and the time until the equine blood is absorbed by the sheet material (sheet material The time until the liquid level reflection of equine blood disappears on the surface of the sample was measured. Two minutes after the injection, 1.5 cc of horse blood was further injected onto the surface of the sheet material, and the time until the horse blood was absorbed into the sheet material was measured in the same manner. As shown in Table 2, horse blood was injected five times at 2 minute intervals, and a total of 7.5 cc of horse blood was absorbed into the sheet material.
In this body fluid repeated absorbent performance test (absorbability measurement test), an absorbent measurement test was performed on three types of absorbent bodies (A, B, C) provided with sheet materials of three types, The performance as an absorber according to the shape of the material was compared.

In addition, the absorber A shown in Table 2 has a structure in which the sheet material 2 has only one sheet. The absorber B has a structure in which two sheets having the same shape are stacked on the sheet material 2. The absorbent body C has a structure in which the sheet material 2 is folded in a C-fold shape shown in FIG. 3 and two sheet material layers are laminated. The absorbent body C is an absorbent body according to an example of the present invention, and the absorbent body A and the absorbent body B are in the form of an absorbent body as a comparative example.
For these three types of absorbent bodies, the cushioning ability in the thickness direction of the absorbent body was measured with a KES compression tester in the same manner as the cushioning characteristics described above.

  In addition, the two sheet | seat materials with which the absorber B was piled up, and the both ends side of the sheet | seat material folded by the C-fold shape of the absorber C are each stuck by the adhesive with weak wet strength. Thus, since the shape is maintained by sticking with an adhesive agent, when the napkin 10 is molded, the absorber is easily covered with the back sheet 20 and the top sheet 30. Here, by using an adhesive having low wet strength as the adhesive, the adhesive is dissolved by the body fluid absorbed when the napkin 10 is used, and the adhesive strength is lowered. And because the adhesion peels off due to the repulsive force based on the stiffness of the sheet material, the side part can be opened to the outside in the width direction of the sheet material to restore the shape before the sheet material is folded, The cushioning property based on the repulsive force to be opened is not hindered by the adhesive.

  As is apparent from Table 2, the cushioning property is greater in the absorbent body B having a structure in which two sheet materials 2 are stacked than in the absorbent body A having a structure in which the sheet material 2 is only one sheet. Further, it can be seen that the absorbent body C having a structure in which the sheet material 2 is folded in the C-fold shape shown in FIG. 3 is preferable. Since the absorbent body C has better cushioning properties than the absorbent body B, the side of the sheet material in the width direction of the sheet material is restored to the shape before the sheet material is folded by the repulsive force based on the stiffness of the sheet material. It can be seen that the cushioning function based on the repulsive force to open outwards works well.

Further, it can be seen from the speed of the absorption speed that the absorbent performance of the body fluid is good in the order of the absorbent C, the absorbent B, and the absorbent A. In particular, since the difference in the absorption rate of the body fluid increases from the time of the first injection of the body fluid to the fifth injection, the repeated absorption performance of the body fluid is also in the order of the absorber C, the absorber B, and the absorber A. I know it ’s good.
The reason why the absorbent body B and the absorbent body C have better absorbent performance than the absorbent body A is that the absorbent body B and the absorbent body C have an absorbent layer (sheet material layer) having a thickness twice that of the absorbent body A. And having one air layer between the two absorber layers, the body fluid absorbed in the first absorber layer moves to the gap between the air layers by capillary action, and further 2 This is because more rapid absorption is performed by being absorbed by the absorber layer.
The reason why the absorbent body C has better absorbent performance than the absorbent body B is that the absorbent body C is a single sheet material in which the first absorbent layer and the second absorbent layer are folded. Therefore, the body fluid absorbed by the first absorber layer is absorbed by the second absorber layer through the air layer, and the body fluid directly passes through the portion where the sheet material is folded. This is because it can move from the second layer to the second layer.

Thus, the napkin 10, absorption stiffness in conformity with JIS P8143 has a shape that 5.5 (cm ^3/100) or 18.2 (cm ^3/100) or less of the sheet material is folded in a C-shape Since the body 40 is provided, it can be said that the napkin has good cushioning properties and good wearing feeling. Further, since the absorbent body 30 has such a C-shape, it can be said that the napkin 10 is a napkin with good absorbability because the absorption performance of body fluids, particularly the repeated absorbent performance is good.
Therefore, the napkin 10 according to the present invention can function suitably as a napkin with good body fluid absorbability and good wearing feeling.

  In addition, the absorber in the napkin (absorbent article) which concerns on this invention is not restricted to the thing of the shape like the above-mentioned absorber 40, The following shapes may be sufficient.

As shown in FIG. 4, the side portions 41 a at both ends in the width direction of the sheet material are folded back to the center side of the sheet material, and are folded so that the end portion of the side portion 40 a is separated at the approximate center of the sheet material. A thing like the absorber 41 which formed the sheet material layer of two layers by carrying out C-fold of the substantially C shape may be sufficient.
If it is such an absorber 41, as FIG.4 (d) shows, a sheet | seat material will be in the substantially center side along the longitudinal direction so that the edge part of the side part 40a of the spaced apart sheet | seat may be brought together. By bending and projecting toward the top sheet 30 side, the fit between the shape of the absorbent body 41 and the crotch region where the napkin is to be worn is improved, and the feeling of wearing the napkin is further improved. .

Further, as shown in FIG. 5, the side portion 42 a in which the notch 42 b is formed at the substantially central side in the longitudinal direction of the end portion of the side portion 42 a on both ends in the width direction of the sheet material is folded back to the center side of the sheet material, A thing like the absorber 42 which formed the sheet material layer of 2 layers by C-folding of the cross-section substantially C-shape may be sufficient.
With such an absorbent body 42, as shown in FIG. 5C, the sheet material is convex toward the top sheet 30 side at the notch 42b portion at the end of the side portion 40a of the separated sheet material. Therefore, the fitting property between the shape of the absorbent body 42 and the crotch portion where the napkin is to be worn is improved, and the feeling of wearing the napkin is further improved.

Further, as shown in FIG. 6, each side portion 43 a at both ends in the width direction of the sheet material is folded back to the center side of the sheet material, and the other side portion 43 a is overlapped with one side portion 43 a to form three layers. A thing like the absorber 43 which formed the sheet | seat material layer may be sufficient.
With such an absorbent body 43, the thickness of the absorbent body can be further increased, and the air layer between the sheet material layers is also increased, so that the body fluid absorption performance is further improved.
Moreover, the fitting feeling of the napkin is further improved by improving the fit between the crotch portion and the portion having the bulges formed by overlapping the side portions 43a of the sheet material.

Further, as shown in FIG. 7, each side portion 44 a in which the convex portion 44 b is formed on the substantially central side in the longitudinal direction of the end portion of the side portion 44 a on both ends in the width direction of the sheet material is folded back to the center side of the sheet material. Alternatively, the absorbent body 44 may be formed such that a bulge made of three sheet material layers is formed in the central portion of the absorber 44 by superimposing the other convex portion 44b on the one convex portion 44b.
With such an absorbent body 44, the absorption performance of the body fluid is further improved in the absorbent body portion having an increased thickness, and the fit between the crotch portion and the portion having the bulge formed by overlapping the convex portions 44b of the sheet material As a result, the feeling of wearing the napkin is further improved.

Further, as shown in FIG. 8, the side portions 45a on both ends in the width direction of the sheet material are folded back to the center side of the sheet material, and folded so that the end portions of the side portions 45a are brought together at the approximate center of the sheet material. A thing like the absorber 45 which has arrange | positioned the predetermined | prescribed interlayer member 46 between the layers of the sheet material of a cross-sectional substantially C-shape may be sufficient.
If the interlayer member 46 is a cushioning material, the feeling of wearing a napkin provided with the absorber 45 is good, and if the interlayer member 46 is a moisture absorbing material such as SAP, the body fluid absorption performance of the napkin provided with the absorber 45 is improved. .
Thus, according to the kind of interlayer member 46 provided between sheet materials, various performances and functions can be imparted or improved to the napkin provided with the absorber 45.

  In the above embodiment, the sheet material is folded and the absorbent body having two sheet material layers and three sheet material layers has been described, but the present invention is not limited to this, and the sheet The number of folding of the material and the number of layers of the sheet material may be arbitrary numbers.

  In addition, either side of the folded absorbent body (for example, the face where the end of the side portion 40a of the absorbent body 40 is brought into contact with the opposite face) is on the top sheet 30 side (human body side). The orientation may be arbitrary.

  Moreover, you may make it form the absorber which has an embossing recessed part using the sheet | seat material in which the embossing recessed part was formed.

  In addition, it is needless to say that other detailed structures can be appropriately changed.

It is an expanded view of the absorbent article to which this invention is applied. It is sectional drawing in the II-II line of FIG. It is explanatory drawing which shows the absorber in this Embodiment, (a) is an expanded view, (b) is a top view in the state which folded the side part of the sheet | seat material, (c) is the cc line of (b). FIG. It is explanatory drawing which shows the modification of the absorber in this invention, (a) is an expanded view, (b) is a top view in the state which folded the side part of the sheet material, (c) folded the side part of the sheet material (D) is a sectional view taken along line dd in (b). It is explanatory drawing which shows the modification of the absorber in this invention, (a) is an expanded view, (b) is a top view in the state which folded the side part of the sheet | seat material, (c) is cc of (b). It is sectional drawing in a line. It is explanatory drawing which shows the modification of the absorber in this invention, (a) is an expanded view, (b) is a top view in the state which folded the side part of the sheet | seat material, (c) is cc of (b). It is sectional drawing in a line. It is explanatory drawing which shows the modification of the absorber in this invention, (a) is an expanded view, (b) is a top view in the state which folded the side part of the sheet | seat material, (c) is cc of (b). It is sectional drawing in a line. It is explanatory drawing which shows the modification of the absorber in this invention, and is sectional drawing of an absorber.

Explanation of symbols

10 Napkin (absorbent article)
20 Back sheet 30 Top sheet 40, 41, 42, 43, 44, 45 Absorber 40a, 41a, 42a, 43a, 44a, 45a Side 46 Interlayer member

Claims (5)

Absorption comprising a top sheet provided on the contact surface side with the human body, a back sheet provided on the surface opposite to the contact surface with the human body, and an absorber interposed between the top sheet and the back sheet. In the sex goods,
The absorber stiffness in conformity with JIS P8143 is 5.5 (cm ^3/100) or 18.2 (cm ^3/100) in which are sheet material is folded below, by laminating a plurality of sheet material layer Absorbent article characterized by comprising.   2. The absorbent article according to claim 1, wherein the absorbent body is configured such that each side portion on both ends in the width direction of the sheet material is folded back to the center side of the sheet material.   2. The absorbent body according to claim 1, wherein each side of the sheet material in the width direction at both ends is folded back to the center side of the sheet material, and the other side is overlapped on one side. The absorbent article as described.   The said absorber is bent in the substantially center side along the longitudinal direction of the said sheet | seat material so that it may become convex toward the said top sheet side, The any one of Claims 1-3 characterized by the above-mentioned. Absorbent article as described in 1. The absorbent article according to any one of claims 1 to 4, wherein the absorbent body includes a predetermined interlayer member between the sheet material layers in which the sheet material is folded and laminated. .

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