KR20160065125A - Absorbent article - Google Patents

Abstract

The absorbent article includes a pair of second length compression grooves 82 and a pair of second width compression grooves 86 extending in the width direction respectively disposed on the outer side in the width direction of the central region RC including the widthwise center of the absorbent body, Respectively. A low rigidity region RL is formed between the second length compression groove 82 and the width direction end portion of the absorbent body. A high rigidity region RH having a higher rigidity than the low rigidity region is formed on the outside in the longitudinal direction of the low rigidity region. The high-rigidity region is formed with compression grooves for compressing the absorbent body in the thickness direction, and is formed on the outer side in the width direction at each of the four positions at the longitudinal outer end of the second length compression groove 82.

Description

[0001] ABSORBENT ARTICLE [0002]

The present invention relates to an absorbent article having a liquid permeable top sheet, a liquid impermeable back sheet, and an absorbent body provided between the top sheet and the back sheet, wherein the top sheet and the absorbent body are squeezed together.

BACKGROUND ART [0002] Conventionally, in an absorbent article such as a sanitary napkin, it is widely known that a liquid-permeable topsheet and a compression groove in which an absorbent body is compressed are formed. In addition, various shapes have been proposed for the compression grooves.

For example, there is disclosed an absorbent article having a pair of inner grooves as compression grooves formed on both side portions of an excretory portion region and a pair of outer grooves as compression grooves formed on the outer sides in the width direction of each of the pair of inner grooves See Document 1). The inner grooves and the outer grooves are curved in a convex shape outward in the width direction when viewed from the plane.

In the absorbent article of Patent Document 1, the inner groove and the outer groove are formed on the outer side in the width direction of the region of the excretion portion, and when the compressive force is applied from the outer side in the width direction to the middle in the width direction at the time of attachment, It is likely to be deformed to a starting point. Therefore, the portions where the inner grooves and the outer grooves are formed move inward in the width direction, and the region of the grooved portion sandwiched between the inner grooves rises toward the wearer.

Patent Document 1: JP-A-2010-136972

However, the above-described absorbent article has the following problems. In the absorbent article disclosed in Patent Document 1, when a compressive force is applied from the outside in the width direction toward the inward width direction, the area outside the widthwise direction of the inside groove and the outside groove moves in the thickness direction while being compressed in the width direction. The region of the outer side in the width direction than the inner groove and the outer groove is raised in the wearer's side by the movement in the thickness direction, or is recessed toward the innerwear side.

At this time, when the area outside the widthwise outer side of the inner groove and the outer groove is recessed toward the undergarment side, the area located outside the widthwise direction of the area for the placement area is located on the underwear side rather than the area for the placement area, It is easy to rise.

However, when the area outside the widthwise outer side of the inner groove and the outer groove is raised toward the wearer side, the area located outside the widthwise direction of the area for the placement area is located closer to the wearer than the area for the placement area. It becomes easy to be concave.

That is, in the absorbent article disclosed in Patent Document 1, when a compressive force is applied from the outside in the width direction to the inward width direction, depending on the deformation of the inside groove or the outside groove, the area of the excreted portion rises to the wearer side, do. Therefore, it is impossible to reliably raise the excreted part area toward the wearer.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an absorbent article capable of stably lifting the central region located at the center in the widthwise direction of the absorbent article toward the wearer.

The absorbent article (absorbent article 1) according to the present invention has a liquid permeable surface sheet (surface) having a longitudinal direction (longitudinal direction L) and a transverse direction (width direction W) (Absorber 30) provided between the topsheet and the backsheet, and at least one of the topsheet and the backsheet, (Compression groove) 80 formed by compressing the absorbent body in the thickness direction of the absorbent article, wherein the compression groove is formed in the center region (central region RC) including the center in the width direction of the absorbent body A pair of longitudinal compression grooves (second longitudinal compression grooves 82) arranged on the outer side in the width direction and extending in the longitudinal direction of the absorbent article; A width-pressing groove extending in the width direction of the absorbent article (Low rigidity region RL), which is lower in rigidity than the region where the length compression groove is formed, is provided between the longitudinal compression groove and the width direction end portion of the absorber. And a high rigidity region (high rigidity region RH) having a higher rigidity than the low rigidity region is provided on the outside in the longitudinal direction of the low rigidity region, and the high rigidity region is formed by pressing the absorbent body in the thickness direction And the absorbent material constituting the absorbent body is a region where the unit weight of the absorbent material is higher than the surrounding area. The widthwise outer side of each of the four longitudinally outer ends of the longitudinally compressed groove As shown in FIG.

1 is a plan view of the absorbent article related to the embodiment as viewed from the side of the skin contact surface.
Fig. 2 is a schematic cross-sectional view of the XX section shown in Fig.
3 is a schematic cross-sectional view of the YY cross section shown in Fig.
Fig. 4 (a) is a schematic sectional view showing a state in which the absorbent article related to the comparative example is mounted. Fig. 4 (b) is a schematic cross-sectional view showing a state in which the absorbent article according to the present embodiment is mounted.

The absorbent article 1 according to the embodiment will be described with reference to the drawings. Fig. 1 is a plan view of the absorbent article, and Fig. 2 is a sectional view taken along the line X-X shown in Fig. 3 is a cross-sectional view taken along line Y-Y shown in Fig. The absorbent article 1 according to the present embodiment is, for example, a sanitary napkin.

The absorbent article related to the embodiment is a sanitary napkin for daytime use. Therefore, the absorbent article according to the present embodiment is characterized in that the entire area R1 positioned in front of the wearer in the longitudinal direction L (longitudinal direction) and the rear area R2 located in the back of the wearer are approximately same.

The region between the pair of wing portions 43 and 44 to be described later is a crotch region R3 arranged in the crotch of the wearer. Specifically, between the base CA1 of the forward direction of the pair of wing portions 43 and 44 and the base CA2 of the backward direction of the pair of wing portions 43 and 44, a crotch region R3 ). The front side of the crotch region R3 becomes the entire region R1 and the rear side of the crotch region R3 becomes the rear region R2. 1 shows the center line in the longitudinal direction L of the absorbent article 1 as the longitudinal center line LCL and the center line in the width direction W of the absorbent article 1 is shown as the width direction center line LCL, (WCL). The center of the crotch region R3 is a position where the longitudinal centerline LCL and the widthwise centerline WCL intersect with each other.

The crotch region R3 of the present embodiment is a region between the wing portions 43 and 44, but the present invention is not limited to this configuration. For example, in the absorbent article having no wing portion, even when the maximum length in the width direction of the absorbent body 30 is longer than the maximum length in the width direction of the entire region R1 and the maximum length in the width direction of the rear region R2 Or the maximum length in the width direction of the absorber 30 may be shorter than the maximum length in the width direction of the entire area R1 and the maximum length in the width direction of the rear area R2.

The entire region R1, the rear region R2, and the crotch region R3 are regions divided in the longitudinal direction of the absorbent article, and are provided adjacent to each other in the longitudinal direction. Further, the absorbent article is provided with a central region RC including the center of the absorbent body 30 in the width direction. The central region RC is a region where the unit weight of the absorbent material constituting the absorbent body 30 is higher than the surrounding area, the region where the absorbing capacity of the body fluid of the absorbent body 30 is higher than the surrounding region, And a region in which a second sheet is arranged. In Fig. 1, a slant line is drawn in the center area RC. The central region RC of the present embodiment is disposed in the crotch region R3. However, in the modified example, the central region RC may be disposed over the entire region R1 and the rear region R2 beyond the crotch region R3.

In this embodiment, the sanitary napkin for daytime use is taken as an example, but the absorbent article related to the present invention can also be applied to a sanitary napkin for night use. The sanitary napkin for night use has a longer rear region R2 located behind the wearer than the entire region R1 positioned in front of the wearer in the longitudinal direction L. [

The absorbent article 1 has a topsheet 10 contacting the wearer's skin, a liquid-impermeable backsheet 20 not permeable to liquid, and an absorbent body 30. [ The absorber 30 is disposed between the topsheet 10 and the backsheet 20. Therefore, the absorber 30 is indicated by a broken line in Fig. 1 and Fig.

The absorbent article 1 has a pair of wing portions 43 and 44 extending outward in the width direction W on both sides of the width direction W of the absorbent body 30 in plan view as shown in Fig. The absorbent article 1 further includes side sheets 41 and 42 provided on the outer side of the absorbent body 30 in the width direction W. [

The topsheet 10 is a liquid-permeable sheet that transmits a liquid such as body fluids. The topsheet 10 covers at least the surface of the absorbent body 30. The topsheet 10 is not particularly limited as long as it is a sheet-like material having a structure permeable to liquid, such as a nonwoven fabric, a woven fabric, a perforated plastic sheet, or a mesh sheet. As the material of woven fabric or nonwoven fabric, any of natural fiber and chemical fiber can be used.

Examples of the natural fiber include cellulose such as pulverized pulp and cotton. Examples of the chemical fiber include regenerated cellulose such as rayon and fibrillray, semi-synthetic cellulose such as acetate and triacetate, thermoplastic hydrophobic chemical fiber, or thermoplastic hydrophobic chemical fiber subjected to hydrophilization treatment.

Examples of the thermoplastic hydrophobic chemical fiber include short fibers such as polyethylene (PE), polypropylene (PP) and polyethylene terephthalate (PET), fibers obtained by graft polymerization of PE and PP, and core- As an example.

The nonwoven fabric may be subjected to web forming in any one of a dry method (card method, spunbond method, melt blown method, airlaid method, etc.), wet method, or a combination thereof. Examples of the bonding method include thermal bonding, needle punching, and chemical bonding. However, the method is not particularly limited to these methods. Further, spun lace formed in a sheet form by water flow discoloration may be used.

As the perforated plastic sheet, a perforated sheet made of a thermoplastic resin such as PE, PP, or PET, or a porous foamed material can be used. It is also preferable to incorporate a filler comprising titanium oxide, calcium carbonate or the like in a range of 0.5 to 10%, if necessary, to make the mixture cloudy. Further, a film made of a thermoplastic resin may be used as a perforated film formed by perforation, heat embossing, machining or the like. The perforated film may be used as a composite sheet with a nonwoven fabric.

The backsheet 20 has a length substantially equal to the length of the topsheet 10. The backsheet 20 may be a laminated nonwoven fabric mainly made of a polyethylene sheet or polypropylene, a breathable resin film, a sheet obtained by bonding a breathable resin film to a nonwoven fabric such as a spunbond or spun lace, or the like. The backsheet 20 is preferably made of a material having flexibility so as not to cause discomfort when worn. For example, it is preferable that the backsheet 20 is made of a low density polyethylene (LDPE) resin in a range of 15 to 30 g / m ² A film can be used. The backsheet 20 is preferably liquid-impervious and moisture-permeable, and may be composed of a microporous sheet obtained by melt-kneading an inorganic filler with an olefin resin such as polyethylene or polypropylene, followed by stretching treatment.

The absorber 30 includes hydrophilic fibers and pulp. The absorber 30 is formed of a material capable of absorbing body fluids such as menstrual blood. Examples of the pulverized pulp fiber include pulp pulp, cellulose such as cotton, regenerated cellulose such as rayon and fibrilray, semi-synthetic cellulose such as acetate and triacetate, particle type polymer, fiber type polymer, thermoplastic hydrophobic chemical fiber, Hydrophobic chemical fibers, air-bonded pulp subjected to chemical bond treatment, or the like may be used alone or in combination.

A method for molding these materials into an absorber is not particularly limited, and for example, a sheet formed by an air-laid method, a melt blown method, a spun lace method, a papermaking method or the like is used. Further, a cellulose foam or a continuous foam of a synthetic resin may be used as the absorber. It is also possible to use a material obtained by pulverizing a foamed or sheeted material and then molding it into an absorber. Among them, the SMS nonwoven fabric sheet is disposed on the lower layer which is the upper layer which is the skin-contacting side of the absorbent body or the skin noncontact side of the absorbent body, the pulp is mixed in the range of 80 to 100%, the particulate polymer is in the range of 20 to 0% An absorber having a unit weight of 100 to 700 g / m ² and a volume of 1 to 50 mm. The absorber may be provided with an SMS nonwoven fabric sheet on both the upper and lower layers.

It is preferable that the absorber 30 according to the present embodiment does not have the SMS nonwoven fabric sheet disposed on the upper layer. In this case, by not arranging the SMS nonwoven fabric sheet in the upper layer, it becomes a wet state, and the peeling of the compression groove 80, which will be described later, does not occur well. Accordingly, even in a long-time use environment, the compression groove 80 is not easily collapsed, and the twist is not generated well. Further, by not arranging the SMS nonwoven fabric sheet in the upper layer, since the body fluids migrate directly from the topsheet 10 to the pulp, the absorption speed is increased and the body fluid leakage can be prevented.

It is preferable that the absorber 30 is provided with a long fiber sheet as an SMS nonwoven fabric sheet disposed on the lower layer of the absorber 30 and a compression groove 80 to be described later is also formed on the long fiber sheet at the same time. In this case, since the upper layer of the absorber 30 is integrated with the lower layer of the absorber, the entire absorber is not twisted well.

The absorber 30 may be formed by laminating a hydrophilic fiber or powder by an airlaid method, or may be an airlaid sheet formed by forming a hydrophilic fiber or powder into a sheet by an airlaid method, and a tissue (for example, / m < ² >) may be disposed on the surface of the substrate and covered with a tissue.

The absorber 30 according to the present embodiment is formed by laminating the planar pulp at a unit weight of about 200 to 500 g / m ² .

The absorber 30 is shaped to extend in the longitudinal direction and is approximately one step smaller than the backsheet 20. The length of the absorbent body 30 in the width direction W corresponds to the crotch gap of a woman and is approximately 50 to 80 mm. The absorber 30 is bonded to the backsheet 20 by an adhesive such as hot melt.

1, the absorber 30 according to the present embodiment has a length W1 in the width direction W of the absorber 30 at the center of the longitudinal direction L of the crotch region R3, W2B of the width direction W of the absorber 30 in the rear region R2 is larger than the maximum length W2A of the width direction W of the absorbent body 30 in the entire region R1, ). The maximum length W2A of the width direction W of the absorber 30 in the entire area R1 and the maximum width W2 of the width direction W of the absorber 30 in the rear area R2 The length W2B is approximately the same.

The absorber 30 has a curved portion 31 whose outer end in the width direction of the absorber 30 is convex toward the outside in the width direction and a straight portion 32 which extends outward in the longitudinal direction from the curved portion 31 . The outer edge 31E of the curved portion 31 is curved in the longitudinal direction L of the crotch region R3 and the center of the longitudinal direction of the central region RC Match. The length in the width direction of the absorber 30 at the longitudinal center of the central region RC is longer than the length in the width direction of the absorber 30 at the longitudinal end of the central region RC.

The side sheets 41 and 42 are disposed on both sides of the topsheet 10. The side sheets 41 and 42 can be selected from the same materials as the topsheet 10. However, in order to prevent the menstrual blood from flowing beyond the side sheets 41, 42 to the outside of the absorbent article 1, it is preferable to have hydrophobicity or water repellency. The side sheets 41 and 42 cover a part of the side edge of the absorbent body 30 and the wing portions 43 and 44.

In the absorbent article 1, the topsheet 10, the side sheets 41, 42, and the peripheral edge of the backsheet 20 are joined together, and the absorbent body 30 is sealed. As a bonding method of the topsheet 10 and the backsheet 20, any one of heat-embossing, ultrasonic waves, or hot-melt adhesives, or a combination of a plurality of them can be used.

In the backsheet 20, an adhesive agent (not shown) is applied to a surface of the backsheet 20 in contact with the undergarment in a plurality of areas. The pressure-sensitive adhesive is intermittently arranged along the longitudinal direction (L) on the back surface side of the absorber (30). The pressure-sensitive adhesive is also provided on the surface of the wing portion 43 and the wing portion 44 which is in contact with the undergarment. In the state before use, the pressure-sensitive adhesive is in contact with a release sheet (not shown). The release sheet prevents the pressure-sensitive adhesive from deteriorating before use. Then, the release sheet is peeled off by the wearer during use.

In the case of the absorbent article not having the release sheet, the adhesive sheet may be configured to prevent the adhesive from deteriorating before use by means of a package sheet for individually packaging the absorbent article. When the pressure-sensitive adhesive comes in contact with the package sheet, it is preferable that the surface of the package sheet is subjected to a treatment for allowing the pressure-sensitive adhesive to be peeled off without lowering the adhesive force of the pressure-sensitive adhesive.

In the backsheet 20, it is preferable that the pressure-sensitive adhesive is arranged in several rows along the longitudinal direction L at a predetermined width along the back surface of the absorber 30. [

In this case, the predetermined width in the width direction W of the pressure-sensitive adhesive is 3 mm to 5 mm, and the pitch between the pressure-sensitive adhesives is 2 mm to 4 mm, which is narrower than the length in the width direction W of the pressure- . If the pitch between the pressure-sensitive adhesives is wider than the length in the width direction (W) of the pressure-sensitive adhesive, there is a risk of distortion occurring therebetween. However, since the pressure-sensitive adhesive is narrower than the length in the width direction (W) .

The absorbent article is provided with a pressing groove 80 in which the topsheet 10 and the absorbent body 30 are compressed in the thickness direction. The compression groove 80 is a groove formed by machining the skin-contacting side of the topsheet of the absorbent article 1 and the non-skin side of the absorbent body 30 (the garment-contacting surface side).

The compression grooves 80 are respectively disposed on the outer side in the width direction of the central region RC and further include a pair of longitudinal compression grooves extending in the longitudinal direction of the absorbent article and a pair of longitudinal compression grooves arranged on the outside in the longitudinal direction of the longitudinal compression grooves, And a width compression groove extending in the width direction of the article.

The length compression groove is a compression groove that extends at least in the longitudinal direction, may be inclined with respect to the longitudinal direction, and includes a compression groove having an angle of 45 degrees or less with respect to the longitudinal direction. The width compression groove is a compression groove that extends at least in the width direction and may be inclined with respect to the width direction and includes a compression groove having an angle with respect to the width direction of less than 45 degrees. In Fig. 1, a boundary point BP between the length-compression groove and the width-compression groove is indicated.

The length compression groove has a pair of first length compression grooves 81, a pair of second length compression grooves 82 located outside the first length compression grooves 81 in the width direction, And a third length compression groove 83 located on the outer side in the longitudinal direction than the first length compression groove 83. The width compression grooves have a pair of first width compression grooves 85 and a pair of second width compression grooves 86 located outside the first width compression grooves 85 in the longitudinal direction.

The first length compression grooves 81, the second length compression grooves 82 and the third length compression grooves 83 are convex shapes that are convex outward in the width direction. A third length compression groove 83 is continuous to each longitudinal end of the second length compression groove 82.

The first length compression groove 81 and the first width compression groove 85 are continuous and form an annular compression groove by the first length compression groove 81 and the first width compression groove 85. The first length compression groove 81 and the first width compression groove 85 are arranged so as to surround the periphery of the central region RC. The third length compression grooves 83 and the second width compression grooves 86 are continuous and the second length compression grooves 82, the third length compression grooves 83 and the second width compression grooves 86 Thereby forming an annular compression groove.

The second longitudinal compression grooves 82, the third longitudinal compression grooves 83, and the second longitudinal compression grooves 83 formed outside the annular compression grooves formed by the first longitudinal compression grooves 81 and the first width compression grooves 85, A plurality of point-like crimping portions 87 are formed between the annular crimping grooves formed by the width crimping grooves 86. A plurality of the pointed crimping portions 87 are formed at intervals.

The rigidity of the region where the second length compression grooves are formed is higher than the rigidity of the region where the first length compression grooves 81 are formed. In a specific configuration, for example, the length-pressing groove has a high-pressure bonding portion having a relatively large dimension in the thickness direction and a low-pressure bonding portion having a relatively small dimension in the thickness direction, And the density is higher than the surface density of the high-pressure bonding portion of the first length compression groove 81.

The dimension in the thickness direction of the compression groove is the concave thickness (thickness compressed in the thickness direction) of the compression groove. Therefore, when the high-pressure bonding portion is compared with the low-pressure bonding portion, the high-pressure bonding portion is pressed against the low-pressure bonding portion. The surface density of the high-pressure bonding portion is a ratio of the area occupied by the high-pressure bonding portion to the entire area of the compression bonding groove. Therefore, the ratio of the high-pressure bonding portion occupying in the entire second length-compression-bonding groove is higher than that of the high-pressure bonding portion occupied in the entire first length compression bonding groove.

The stiffness of the region where the second length compression groove 82 is formed is larger than the stiffness of the region where the first length compression groove 81 is formed, The length of the second length compression groove 82 is larger than that of the first length compression groove 81 and the width of the second length compression groove 82 is larger than the width of the first length compression groove 81, The structure in which the unit weight or density of the absorber 30 is higher than the unit weight or density of the absorber 30 in the first length compression groove 81 and the structure in which the area of the high- A configuration that is larger than the area of the high-pressure bonding portion of the length-pressing groove 81 can be exemplified.

The width direction end portion of the absorber 30 is located outside the second length press fit groove 82 in the width direction. A low rigidity region RL having a lower rigidity than an area in which the second length compression grooves 82 are formed is provided between the width direction end portion of the absorber 30 and the second length compression grooves 82. [ In Fig. 1, the low rigidity region RL is drawn with oblique lines. The low rigidity region RL is provided in the crotch region R3. At least a part of the low rigidity region RL overlaps with the central region RC in the longitudinal direction.

A high rigidity region RH having a higher rigidity than the low rigidity region RL is provided outside the low rigidity region RL in the longitudinal direction. The high rigidity region RH is a region where a compression groove formed by pressing the absorbent body 30 in the thickness direction is formed or a region where the unit weight of the absorbent material constituting the absorbent body 30 is higher than the ambient. In the high rigidity area RH of the present embodiment, a high rigidity compression groove 88 is formed.

The high-rigidity pressing groove 88 extends in the longitudinal direction. The high-rigidity compression grooves 88 are provided on the outer sides in the width direction of each of the four positions at the longitudinal outer ends of the second length compression grooves 82. The longitudinal outer end of the second longitudinal compression groove 82 is in other words the longitudinal inner end of the third longitudinal compression groove 83. The boundary between the second length compression groove 82 and the third length compression groove 83 is recessed inward in the width direction. The high-rigidity compression grooves are disposed so as to extend across the boundary between the second length compression grooves 82 and the third length compression grooves 83 in the longitudinal direction.

The high rigidity region RH is positioned outside the extension line LE of the arc-shaped outer edge 31E of the curved portion 31 of the absorber 30 in the longitudinal direction. The high rigidity region RH is positioned outside the boundary 33 between the curved portion 31 of the absorber 30 and the straight portion 32 in the longitudinal direction.

The four high rigidity regions RH are arranged at intervals in the width direction and the longitudinal direction. The distance in the longitudinal direction of the high rigidity region RH is preferably 50 to 150 mm. If the distance in the longitudinal direction of the high stiffness region RH is less than 50 mm, it is likely to receive a force directed toward the inside in the width direction by contacting the leg at the time of mounting. On the other hand, if the distance in the longitudinal direction of the high stiffness region RH is longer than 150 mm, the effect of keeping the plane around the central region RC can not be sufficiently obtained since it is excessively separated from the central region RC.

The distance between the second length compression groove 82 and the widthwise outer end of the absorbent body 30 is preferably 5 mm to 20 mm. If the distance between the second length compression groove 82 and the widthwise outer end of the absorbent body 30 is less than 5 mm, the wearer may feel a hardness when subjected to lateral pressure by the widthwise outer end of the absorbent body. On the other hand, when the distance between the second length compression groove 82 and the widthwise outer end of the absorber 30 is longer than 20 mm, when a force is applied from the outside in the width direction to the width inward at the time of mounting, The height of the outer end portion in the width direction of the absorbent article rising from the base portion 82 becomes higher than that of the central region, which may hinder the pitability of the central region.

The high rigidity region RH may be a region where a compression groove for pressing the absorbent body 30 in the thickness direction is formed and a unit weight of the absorbent material constituting the absorbent body 30 is higher than the surrounding area. The rigidity of the high rigidity region RH may be higher than the rigidity of the low rigidity region RL. For example, the rigidity of the high rigidity region RH may be higher than the rigidity of the region where the second length compression groove 82 is formed, It may be lower than the rigidity of the region where the groove 82 is formed.

For example, in the structure in which the absorber 30 is disposed in the high-stiffness region RH and the low-stiffness region RL, the unit weight of the absorptive material constituting the absorber 30 in the stiffness region has a low rigidity May be configured to be higher than the unit weight of the absorbent material constituting the absorbent body 30 in the region RL.

The high-rigidity pressing groove 88 may be inclined with respect to the longitudinal direction or may extend in the width direction. The high-rigidity compression grooves 88 may be linear or curved, or may be constituted by a plurality of sets of point-crimp portions.

The unit weight and density of the absorber 30 can be measured by, for example, the following measuring method. In the case of the absorbent article packaged by the package, the package is opened, and the folded absorbent article is developed to measure the thickness and the area of the unit weight and the density to be measured. Subsequently, the part for which the unit weight and the density are to be measured is cut out from the absorbent article, and the weight of the cut part is measured. Subsequently, portions other than the absorber such as the topsheet and the backsheet are removed from the cut-out portion, and the weight of the absorber is measured. The unit weight is calculated on the basis of the weight of the absorber, the unit weight, and the area of the portion to be measured. The density is calculated based on unit weight and thickness.

Further, the bending rigidity of the absorbent article can be measured by, for example, a gully method prescribed in JIS-1096.

(Manufacturing method of absorbent article)

Next, a part of the manufacturing method of the absorbent article 1 according to the present embodiment will be described. As a method not described, an existing method can be used. In the method for producing an absorbent article, a sheet producing step is performed as a first step. Subsequently, a sheet bonding step is performed as a second step. Specifically, the topsheet 10 and the side sheets 41, 42 are bonded by, for example, thermal welding.

As the third step, an absorber molding process is performed. Specifically, pulp to be the material of the absorbent body is formed by the forming drum to form the absorbent body 30. The order of the sheet producing step in the first step and the second step and the step of forming the absorbent body in the third step may be reversed.

A bonding step is performed in the fourth step. Specifically, a joining step for joining the absorbent body 30 molded in the third step to the topsheet and the side sheet bonded in the second step is performed.

A step of forming the compression groove 80 is performed in the fifth step. Specifically, the topsheet 10 and the absorbent body 30 are compressed in the thickness direction to form the compression grooves 80. As shown in Fig.

In the sixth step, the backsheet bonding step is performed. Concretely, the absorbent body 30 and the topsheet 10, the side sheets 41, 42 and the backsheet 20, which are formed with the compression grooves, are bonded by applying a hot-melt adhesive.

Thereafter, a step of applying an adhesive as an anti-slip material, a folding step, and a packaging step of the absorbent article 1 are performed on the skin noncontact side (garment contact surface side) of the backsheet 20. By the above-described process, the absorbent article related to the present embodiment can be produced.

Further, after the absorbent article is produced, the absorbent article may be folded. Specifically, for example, the absorbent article may be folded in the longitudinal direction starting from the first folding line FL1 and the second folding line FL2 along the width direction. Fig. 1 shows a first folding line FL1 and a second folding line.

(Action and effect)

In the absorbent article 1 according to the present embodiment, since the length compression grooves are formed outside the central region RC in the width direction, when the compression force from the outside in the width direction to the width direction center acts, The force is transmitted inward in the width direction, and the force propagates inward in the width direction through the length compression groove.

At this time, the low rigidity region RL located outside the widthwise direction of the length compression groove is deformed and compressed in the width direction. On the other hand, since the high rigidity region RH is located outside the low rigidity region RL in the longitudinal direction, the force inward in the width direction is hardly applied to the low rigidity region RL at the time of mounting, RL). Further, the high rigidity region RH is higher in rigidity than the low rigidity region RL, and therefore is not more deformed than the low rigidity region RL.

Therefore, when compressive force is applied from the outside in the width direction to the widthwise center at the time of mounting, the force is absorbed by the deformation of the low rigidity region RL and the high rigidity region RH, which is not deformed relatively, . By providing a flat area at four locations on the longitudinal outer end of the longitudinal compression grooves, the pair of longitudinal compression grooves can be pressed inward in the width direction and can be raised to the wearer's side.

4A shows a modification of the absorbent article according to the comparative example in which the high rigidity region RH is not provided. Fig. 4B shows a modification of the absorbent article according to the present embodiment . 4 (a) and 4 (b) show a state in which a compressive force F, which is directed inward in the width direction by the force of the legs around the crotch, acts on the absorbent article when the absorbent article is attached to the undergarment It is a schematic diagram. 4 (a) and 4 (b) are cross-sectional views based on the Y-Y line shown in Fig.

4A, when the rigidity of the high rigidity area RH is not high, a compressive force is applied from the outside in the width direction when the absorbent article is attached, and the high rigidity area RH rises to the wearer side do. The central region of the absorbent body is deformed to fall away from the wearer than the first length compression groove 81 and the second length compression groove 82 which are the origin of deformation. In the deformed state, when a compressive force toward the inward widthwise direction acts on the absorbent article, the force directed toward the inward widthwise direction changes into a force directed toward the noncontact side of the skin. Therefore, the lower portion of the absorbent body 30 is deformed in a convex shape by a downward force toward the non-contact side of the skin.

On the other hand, as shown in Fig. 4 (b), since the high stiffness region RH is provided, the high stiffness region RH does not rise to the skin contact surface side. Therefore, the high rigidity region RH can maintain a position (position in the vertical direction) equivalent to that of the first length compression groove 81 and the second length compression groove 82. The high rigidity region RH becomes a position (position in the up-and-down direction) equal to the lower portion of the center in the width direction of the absorber 30. An upward force can be applied to the lower portion of the absorber 30 through the high rigidity region RH so that the width direction of the absorber 30 in the width direction The central portion is raised toward the wearer.

When a compressive force is applied from the outside in the width direction to the inside in the width direction at the time of mounting, the area outside the longitudinal direction in the longitudinal direction is deformed. For example, There may be a case where it is recessed toward the side. It is conceivable that the deformation of the region is propagated to the central region RC and the central region RC is also recessed toward the undergarment side if the region outward in the longitudinal direction than the central region RC is recessed toward the undergarment. However, deformation of the region outside the longitudinal direction in the width direction can be suppressed by the width compression groove, so that the state in which the central region RC is raised can be easily maintained.

The central region RC is a region where the unit weight of the absorbent material constituting the absorbent body 30 is higher than the surrounding area, the region where the absorbing capacity of the body fluid of the absorbent body 30 is higher than the surrounding region, And a region in which a second sheet is arranged. The central region RC thus configured is a region having a high absorption performance as compared with the surrounding region. By lifting the central region (RC) to the wearer's side, the discharged body fluid can be maintained in the vicinity of the excretion of the wearer, thereby suppressing the discomfort caused by leakage of the body fluid or spread of the liquid.

Since the high rigidity region RH is formed along the longitudinal direction, a certain range extending in the longitudinal direction can be maintained in a planar shape, and the starting point of deformation can be stabilized.

The rigidity of the region where the second length compression groove 82 is formed is higher than the rigidity of the region where the first length compression groove 81 is formed. When a force applied from the outside in the width direction to the inside in the width direction acts on the absorbent article, the second length compression groove 82 having a relatively high rigidity becomes the starting point of deformation. The second length compression grooves 82 are separated from the central area RC more than the first length compression grooves 81. By providing the deformation starting point away from the central region RC, it is possible to secure a larger area on the inner side in the width direction than the starting point of deformation. The area on the inner side in the width direction than the starting point of the deformation is the area which is raised to the wearer side. By securing the above area wider, the wearer's side is raised higher and the pitability can be further improved.

The high rigidity region RH is positioned outside the boundary between the curved portion 31 and the straight portion 32 in the longitudinal direction. For example, if the entire width-direction outer end portion of the absorber 30 is a straight line portion, a force directed from the outer side to the inner side in the width direction tends to be transmitted to the entire lengthwise direction of the absorber 30. However, since the length in the width direction of the absorber 30 is changed, the force of propagation at the boundary 33 between the curved portion 31 and the straight portion 32 is interrupted, It is possible to suppress the propagation of the force to the rear side. The high rigidity region RH is located outside the boundary 33 between the curved portion 31 and the straight line portion 32 in the longitudinal direction so that it is not affected by the force directed from the outside in the width direction to the inside in the width direction. Therefore, the high rigidity region RH can be easily maintained in the plane.

The high rigidity region RH is located outside the longitudinal direction of the extension line of the outer edge of the curved portion 31. The absorbent article is sandwiched by the legs at the time of attaching, so that a force directed from the outer side to the inner side in the width direction is applied to the outer edge of the absorbent article. This force is propagated along the outer edge of the absorber. Since the high rigidity region RH is located outside the extension of the outer edge of the curved portion 31 in the longitudinal direction, even if the force from the outside toward the inside in the width direction is propagated along the outer edge of the absorber, The influence of the above-mentioned force is not easily received. Therefore, the high rigidity region RH can be easily maintained in a planar shape.

The high rigidity region RH is formed across the first folding line FL1 and the second folding line FL2. The absorbent article is provided with folding wrinkles extending in the width direction at the portions where the fold lines such as the first fold line and the second fold line are formed. When the folding wrinkles are formed, a force applied to the inside in the width direction at the time of mounting tends to escape along the folding wrinkles. Since the high rigidity region RH is formed over the first folding line FL1 and the second folding line FL2, a force applied to the inner side in the width direction at the time of mounting escapes along the folding fold, The region RH can be easily held on the plane.

The back sheet at the center in the width direction of the central region RC is not provided with the adhesive portion for attaching the absorbent article to the undergarment. Since the center of the widthwise center of the central region RC is not fixed to the undergarment, the central region RC is more likely to rise in the central region and the central region RC is more likely to fit in the wearer.

(Other Embodiments)

As described above, the contents of the present invention are disclosed through the embodiments of the present invention, but it should not be understood that the description and the drawings constituting a part of this disclosure are intended to limit the present invention. From this disclosure various alternative embodiments, embodiments and operational techniques will become apparent to those skilled in the art.

For example, the absorbent article is not limited to sanitary napkins, and may be an absorbent pad or panty liner.

The back sheet of the high stiffness region RH may be provided with a sticking portion for attaching the absorbent article to the undergarment. The high rigidity region RH serves as a starting point for lifting the central region toward the wearer. By fixing the high-stiffness region to the undergarment, the high-stiffness region RH is less likely to float, and the central region RC can be more easily deformed into a convex shape toward the wearer.

The entire contents of Japanese Patent Application No. 2013-199921 (filed on September 26, 2013) are incorporated herein by reference.

Industrial availability

It is possible to provide an absorbent article capable of stably lifting the central region located at the widthwise center of the absorbent article toward the wearer.

The absorbent article according to any one of claims 1 to 3, wherein the absorbent article comprises a topsheet, a backsheet, and a backsheet. The absorbent article has a curved portion. 31E is an outer edge of the curved portion. The first width compression grooves and the second width compression grooves are formed in the width direction of the wing portion of the wing portion. RH: high rigidity region, RL: low rigidity region, L: lengthwise direction, W: lengthwise direction, R: high rigidity region, Width direction

Claims (10)

And has a longitudinal direction and a width direction orthogonal to the longitudinal direction,
A liquid impermeable backsheet; and an absorbent body provided between the topsheet and the backsheet,
An absorbent article comprising at least a surface sheet and a compression groove formed by compressing the absorbent body in the thickness direction of the absorbent article,
Wherein the compression grooves each include a pair of longitudinal compression grooves disposed on the outer side in the width direction of the central region including the center in the width direction of the absorbent body and extending in the longitudinal direction of the absorbent article, And a width compression groove extending in the width direction of the absorbent article,
A low rigidity region having a lower rigidity than an area in which the length compression groove is formed is provided between the length compression groove and the width direction end portion of the absorbent body,
A high rigidity region having a higher rigidity than the low rigidity region is provided on the outside in the longitudinal direction of the low rigidity region,
Wherein the high rigidity region is a region in which a compression groove in which the absorbent body is compressed in the thickness direction is formed or a region where the unit weight of the absorbent material constituting the absorbent body is higher than ambient, Wherein the absorbent article is provided on the outer side in the width direction. 2. The absorbent article according to claim 1, wherein the central region has a region where the unit weight of the absorbent material constituting the absorbent body is higher than the surrounding area, a region where the absorbent capacity of the body fluid of the absorbent body is higher than the surroundings, Wherein the absorbent article is constituted by any of the areas disposed on the absorbent article. The absorbent article as set forth in claim 1 or 2, wherein the absorbent body is disposed in the high rigidity region and the low rigidity region,
The unit weight of the absorbent material constituting the absorbent body in the high rigidity region is higher than the unit weight of the absorbent material constituting the absorbent body in the low rigidity region. The absorbent article as set forth in claim 1 or 2, wherein the high rigidity region is formed along the longitudinal direction. The press machine according to claim 1 or 2, wherein the length compression groove has a first length compression groove and a second length compression groove which is located outside the widthwise direction of the first length compression groove,
The rigidity of the region where the second length compression groove is formed is higher than the rigidity of the region where the first length compression groove is formed. 6. The apparatus according to claim 5, wherein the length compression grooves include a high-pressure bonding portion having a relatively large dimension in the thickness direction, and a low-pressure bonding portion having a relatively small dimension in the thickness direction,
And the surface density of the high-pressure bonding portion of the second length compression groove is higher than the surface density of the high-compression bonding portion of the first length compression bonding groove. The absorbent article according to any one of claims 1 to 3, wherein the absorbent body has a curved portion whose outer side end in the width direction is convex outward in the width direction and a straight portion extending outward in the longitudinal direction from the curved portion,
And the high rigidity region is located outside the longitudinal direction than the boundary between the curved portion and the straight portion. 8. The apparatus according to claim 7, wherein the curved portion is an arcuate shape which is convex outward in the width direction,
And the high-rigidity region is located outside the arcuate extension of the curved portion in the longitudinal direction. 3. The absorbent article according to claim 1 or 2, wherein the absorbent article is folded in the longitudinal direction from a first fold line and a second fold line along the width direction,
And the high rigidity region is formed across the first folding line and the second folding line. The absorbent article as set forth in claim 1 or 2, wherein the backsheet at the center in the width direction of the central region is not provided with an adhesive portion for attaching the absorbent article to the undergarment.

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