JP5904712B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin.

  Patent Document 1 discloses a sanitary napkin as an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. A sanitary napkin having a recess in which a top sheet and an absorbent body are pressed in the thickness direction is described. A plurality of recesses of the absorbent article are formed over the entire surface of the absorbent body. Therefore, the thickness of an absorbent article becomes thinner than the absorbent article in which the recessed part squeezed in the thickness direction is not formed. Therefore, for example, even when the weight of the absorber is increased to improve the absorption performance, the thickness of the absorber can be made relatively thin.

JP 2009-291473 A (FIG. 1, FIG. 4B, etc.)

  However, the above absorbent article has the following problems. Since the density of the absorbent body of the absorbent article described above is increased due to the formation of the recesses, the density of the entire absorbent body is increased. Therefore, an absorber becomes hard, the touch with respect to a wearer worsens, and a wearing feeling may worsen.

  In addition, when the wearer wearing the absorbent article closes both legs, when the force is applied from the outer side in the width direction to the inner side of the absorbent article, the absorbent body is hard and is not easily bent in a curved line. The center in the width direction of the body may be deformed into a convex shape along the longitudinal direction. For example, in an absorbent article having a relatively thin thickness (for example, 3 mm or less), when the center in the width direction of the absorbent body is deformed into a convex shape, the deformed convex portion is likely to be sharp. Therefore, there is a risk of feeling pain when the convex portion hits the wearer, or the convex portion may irritate the skin, which may deteriorate the feeling of wearing. In addition, when the convex portion is formed along the longitudinal direction, the absorbent body becomes difficult to bend along the outer shape of the body in the front-rear direction, and the fit may be reduced. Furthermore, the body fluid may flow along the convex portion along the longitudinal direction, and the body fluid may diffuse or liquid leakage may occur.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the absorbent article which can improve fit property and a feeling of mounting | wearing, ensuring absorption performance.

  In order to solve the above-described problems, an absorbent article according to the present invention includes a liquid-permeable top sheet (top sheet 10), a liquid-impermeable back sheet (back sheet 20), and the top sheet and the back sheet. An absorbent article having an absorber (absorber 30) disposed between the central region (central region A1) including the center of the excretory opening contact region and the central region. A peripheral region (surrounding region A2) disposed adjacent to the central region in the periphery, and the density of the absorber in the peripheral region is lower than the density of the absorber in the central region, The central region is provided with a central squeezed portion (central squeezed portion 61) in which the absorber is squeezed in the thickness direction.

  Since the absorbent article according to the present invention is provided with a peripheral region having a lower density than the central region around the central region of the absorbent body, when the absorbent article is pressed inward from the outside in the width direction, The surrounding area is deformed to absorb the external force, and the deformation of the central area can be reduced. Therefore, it becomes easy to maintain a center area in the state facing the excretion opening. Since the central region having a higher density than the surrounding region is disposed at the center of the absorbent body where the excretion opening easily contacts, body fluid can be easily drawn in the central region. Furthermore, since the central squeezing part is provided in the central region, the thickness in the vicinity of the center of the absorbent body that can easily come into contact with the vicinity of the excretion opening can be reduced, and the wearing feeling can be improved. Further, the deformation of the surrounding area can reduce the deformation of the central area having a high density, and the deterioration of the wearing feeling due to the relatively hard central area being bent toward the body can be suppressed.

It is the top view seen from the skin contact surface side of the absorptive article concerning a 1st embodiment of the present invention. It is a rear view of the absorbent article shown in FIG. It is the top view seen from the skin contact surface side of the absorber shown in FIG. It is a schematic cross section of the AA cross section shown in FIG. It is a figure for demonstrating the manufacturing method of the absorbent article which concerns on embodiment of this invention. It is the figure which showed typically the absorber shaping | molding 2nd process in the manufacturing method of the absorbent article shown in FIG. It is a partial expanded sectional view of the compression roll of the absorber shaping | molding process shown in FIG. It is sectional drawing which showed typically the absorber shape | molded in the manufacturing method of the absorbent article shown in FIG. It is a partial expanded sectional view of the compression roll of the absorber 2nd formation process in the manufacturing process of the absorptive article concerning a 2nd embodiment. It is sectional drawing which showed typically the absorber shape | molded in the manufacturing method of the absorbent article shown in FIG.

(First embodiment)
With reference to FIG.1 and FIG.2, the absorbent article which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a plan view of the absorbent article, and FIG. 2 is a rear view of the absorbent article. The absorbent article 1 according to the present embodiment is, for example, a sanitary napkin.

  The absorbent article 1 includes a top sheet 10 that comes into contact with the wearer's skin, a liquid-impermeable back sheet 20 that does not transmit liquid, and an absorber 30. The absorber 30 is disposed between the top sheet 10 and the back sheet 20. Therefore, the absorber 30 is shown with a broken line in FIG. The absorbent body 30 is disposed at the central portion in the longitudinal direction L and the width direction W of the absorbent article 1. In addition, the absorbent article 1 includes wing portions 43 and 44 provided outside the absorbent body 30 in the width direction W orthogonal to the longitudinal direction L in the plan view shown in FIG. Furthermore, the absorbent article 1 includes side sheets 41 and 42 provided outside the absorber 30 in the width direction W.

  The top sheet 10 is a liquid-permeable sheet that transmits liquid such as body fluid. The top sheet 10 covers at least the surface of the absorber 30. The top sheet 10 is not particularly limited as long as it is a sheet-like material having a structure that allows liquid to permeate, such as a nonwoven fabric, a woven fabric, a perforated plastic sheet, and a mesh sheet. Either natural fibers or chemical fibers can be used as the woven or non-woven material.

  The back sheet 20 has substantially the same length as that of the top sheet 10. As the back sheet 20, a polyethylene sheet, a laminated nonwoven fabric mainly composed of polypropylene, a breathable resin film, a spunbond, a sheet obtained by bonding a breathable resin film to a nonwoven fabric such as spunlace, or the like can be used. The back sheet 20 is preferably made of a material having flexibility that does not cause a sense of incongruity when worn. The back sheet 20 is desirably liquid-impervious and moisture-permeable, and can be constituted by a microporous sheet obtained by stretching a melt-kneaded inorganic filler such as polyethylene or polypropylene. .

The absorber 30 includes hydrophilic fibers and pulp. The absorber 30 is formed of a material that can absorb body fluid such as menstrual blood. The absorbent body 30 may be formed by laminating hydrophilic fibers or powder by the airlaid method, an airlaid sheet obtained by forming hydrophilic fibers or powder into a sheet shape by the airlaid method, or a tissue (for example, It may be formed by placing pulverized pulp mixed with a superabsorbent polymer on a basis weight of 15 g / m ² ) and wrapping it with a tissue.

The absorbent body 30 according to the present embodiment is configured by wrapping a pulp 8 in which cotton-like pulp, synthetic pulp, or the like is laminated to a basis weight of about 100 to 300 g / m ² with protective paper (not shown). The thickness of the core part 31 (for example, refer FIG. 3) located in the center in the width direction of the absorber 30 is thicker than the thickness of the both sides in the width direction. The absorber 30 may have a substantially uniform thickness or a non-uniform thickness before the second absorber molding process described later. The protective paper is for holding the shape of the pulp and preventing diffusion of the absorbed body fluid. For example, crepe paper can be used.

  The absorber 30 has a shape extending in the front-rear direction, and is approximately one size smaller than the back sheet 20. The length of the absorbent body 30 in the width direction W corresponds to the crotch interval of an adult female and is approximately 50 to 80 mm. The absorber 30 is bonded to the back sheet 20 with an adhesive such as hot melt. The absorber 30 will be described in detail later.

  The side sheets 41 and 42 are disposed on both sides of the top sheet 10. The side sheets 41 and 42 can be selected from the same material as the top sheet 10. However, in order to prevent menstrual blood from flowing over the side sheets 41 and 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 absorber 30 and the wing parts 43 and 44.

  In the absorbent article 1, the periphery of the surface sheet 10, the side sheets 41 and 42, and the back sheet 20 is joined, and the absorber 30 is enclosed. As a method for joining the top sheet 10 and the back sheet 20, any one or a combination of heat embossing, ultrasonic waves, or hot melt adhesive can be used.

  In the back sheet 20, the adhesive 50 is applied to the surface in contact with the undergarment in a plurality of regions (see FIG. 2). The adhesive 50 is intermittently disposed along the longitudinal direction L of the back sheet 20. The adhesive 50 is also provided on the surface in contact with the undergarment in the wing portion 43 and the wing portion 44. In a state before use, the adhesive 50 is in contact with a release sheet (not shown), and the release sheet prevents the adhesive from deteriorating before use. And a peeling sheet peels by a wearer at the time of use. In addition, in the absorbent article which does not have a peeling sheet, you may be comprised so that it may prevent that an adhesive agent deteriorates before use with the packaging sheet which wraps an absorber separately. When the adhesive and the packaging sheet are in contact with each other, it is desirable that the surface of the packaging sheet be treated so that the adhesive can be peeled without reducing the adhesive strength of the adhesive.

  Next, the configuration of the absorber 30 will be described in detail based on FIGS. 3 and 4. FIG. 3 is a plan view seen from the skin contact surface side of the absorbent body 30 in a state in which the top sheet 10, the back sheet 20, and the side sheets 41 and 42 are removed from the absorbent article shown in FIG. FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. The absorber 30 includes a central region A1 including the center of the excretory opening contact region of the absorber 30 and a peripheral region disposed adjacent to the central region A1 around the central region A1 in the plan view illustrated in FIG. A2 and a thin layer region A3 disposed adjacent to the peripheral region around the peripheral region A2. The elliptical two-dot chain line shown in FIG. 3 indicates the outer edge of the central region A1, and the outer side of the two-dot chain line is the surrounding region A2. An elliptical dash-dot line shown in FIG. 3 indicates the outer edge of the surrounding area A2, and the outer side of the dash-dot line is the thin layer area A3. The center area A1 and the surrounding area A2 are areas corresponding to the core portion 31 where the absorber 30 is thick, and are excretion opening contact areas where the wearer's excretion opening contacts.

  The center of the excretion opening contact area is the center in the longitudinal direction and the width direction of the area where the wearer's excretion opening comes into contact. For example, in an absorbent article having a wing portion, the center in the longitudinal direction of the wing portion is the center in the longitudinal direction of the excretory opening contact region. Moreover, in the absorbent article which does not have a wing part, the position where the length dimension of the width direction of an absorber is the shortest becomes the center of the longitudinal direction of an excretion opening | mouth contact | abutting area | region. The excretory opening contact region is included in a region that contacts the wearer's crotch, and is located between the wearer's legs. The center area A1 may be an area that includes at least the center of the excretory opening contact area, and the center of the central area A1 may be the center of the excretion opening contact area, or the center of the central area A1 and the excretion opening The center of the contact area may be shifted.

  As shown in FIG.1 and FIG.4, the surrounding pressing part 62 by which the absorber 30 and the surface sheet 10 were pressed in the thickness direction T is formed in the outer edge of surrounding area A2. The outer edge of the surrounding region A2 is a boundary portion between the surrounding region A2 and the thin layer region A3, and is a portion including not only the boundary but also an inner portion and an outer portion that are near the boundary. The surrounding pressing part 62 is provided so as to surround the surrounding area A2 so as to distinguish the central area A1 and surrounding area A2 corresponding to the core part 31 from the thin layer area A3. Moreover, the surrounding pressing part 62 is provided with two or more also in the thin layer area | region A3 used as the outer side in the longitudinal direction L of a core part.

  The center area A1 is configured to include the center of the excretion opening contact area. A plurality of central squeezed portions 61 obtained by squeezing the absorbent body 30 in the thickness direction T are formed in the central region A1. A plurality of central pressing parts 61 are formed over the entire central region A1. By providing the central squeezing part 61 over the entire central region A1, it becomes easy to maintain the thickness of the absorber 30 in a thin state.

  The length W6 of the central pressing part 61 in the width direction W is longer than the length L6 of the central pressing part 61 in the longitudinal direction L. Since the width direction length W6 of the center pressing part 61 is formed comparatively long, the resistance with respect to the force from the width direction outer side becomes large. Therefore, it is possible to suppress deformation of the central region A1 when a force is applied from the outer side in the width direction of the absorbent article 1 to the inner side, such as when the wearer wearing the absorbent article 1 closes both legs. it can. On the other hand, since the longitudinal direction length L6 of the central pressing part 61 is shorter than the width direction length W6, the absorber 30 becomes easy to deform | transform along the front-back direction. Therefore, the absorber 30 can be easily bent along the outer shape of the wearer's body in the front-rear direction, and the fit of the absorbent article can be improved.

  In the thin layer region A3, a thin layer pressing portion 63 obtained by pressing the absorber 30 in the thickness direction is provided. A plurality of thin layer pressing portions 63 are formed over the entire thin layer region A3. By providing the thin layer pressing portion 63 over the entire thin layer region A3, the thickness of the absorber 30 can be easily maintained in the thin layer region A3. The thin layer pressing part 63 includes a first thin layer pressing part 63A having a length in the width direction longer than the length in the longitudinal direction, and a second thin layer pressing part 63B having a length in the longitudinal direction longer than the length in the width direction. Have

  63 A of 1st thin layer pressing parts are the same shapes as the center pressing part 61. FIG. A large number of first thin layer pressing parts 63 </ b> A are formed on the outer side in the longitudinal direction with respect to the core part 31. Therefore, the resistance to the force from the outside in the width direction can be increased at both sides in the longitudinal direction L of the absorber 30, and the deformation due to the force from the outside in the width direction can be suppressed. The second thin layer pressing part 63 </ b> B is provided at the end in the width direction of the absorbent body 30 adjacent to the core part 31. The width direction side edge part of the absorber 30 adjacent to the core part 31 is a part corresponding to a wearer's crotch part, and is a part which a wearer's crotch inner part hits. When the rigidity of the absorber 30 in the portion where the inner portion of the wearer's crotch is too high, the feel to the wearer may be deteriorated, and the wearing feeling may be deteriorated. However, since the second thin layer pressing portion 63B is formed at the width direction side end portion of the absorbent body 30 adjacent to the core portion 31, the absorbent body is easily deformed along the longitudinal direction, and the wearing feeling is improved. Deterioration can be suppressed.

  In addition, the center pressing part 61 and the thin layer pressing part 63 should just be formed by pressing the absorber 30 to the thickness direction T, and can employ | adopt various structures. For example, it can be formed by pressing or embossing, and the shape thereof may be a lattice network or a honeycomb shape. Moreover, the some center pressing part 61 and the thin layer pressing part 63 may be arrange | positioned in contact with each other, and may be arrange | positioned mutually spaced apart. More preferably, the plurality of central squeezing parts 61 and the thin layer squeezing parts 63 are separated from each other in consideration of maintaining the thickness of the absorber, making it difficult to leave a compromise, and maintaining suppleness. It is desirable that they are arranged. By providing the central pressing portion 61 and the thin layer pressing portion 63 in the central region A1 and the thin layer region A3 of the absorbent body, the thickness of the entire absorbent body can be reduced. Therefore, for example, even when the basis weight of the absorber is increased in order to improve the absorption performance, the thickness of the absorber can be maintained in a thin state. For example, the absorber according to the present embodiment can be suitably used in an absorbent article having a thickness of 3 mm or less.

  As shown in FIG. 4, the thickness of the absorber is different in each of the central region A1, the surrounding region A2, and the thin layer region A3. The central region A1 is thinner than the surrounding region A2 and thicker than the thin layer region A3. Specifically, the central region A1 has a thickness of 2.0 mm, the surrounding region A2 has a thickness of 2.2 mm, and the thin layer region A3 has a thickness of 1.0 mm. Moreover, the thickness of the surrounding pressing part 62 formed between surrounding area | region A2 and thin layer area | region A3 is 0.3 mm.

  Since the thickness of the central portion that easily contacts the excretion opening is thinner than the thickness of the surrounding area, it is possible to make it difficult for the wearer to feel the thickness of the absorbent body 30, and to improve the wearing feeling. Furthermore, the back surface side surfaces of the central region A1 and the surrounding region A2 are configured to be positioned on the outer side in the thickness direction than the back surface side surface of the thin layer region A3. Since the core part 31 used as center area | region A1 and surrounding area | region A2 is thick compared with thin layer area | region A3, a wearer may become easy to feel thickness. However, since the absorbent body in the central region A1 and the surrounding region A2 corresponding to the core portion 31 swells toward the back sheet side than the absorbent body in the thin layer region A3, the swelling toward the skin contact surface side is suppressed. It is possible to make the appearance of the surface sheet side clear and make it difficult for the wearer to feel the thickness.

  In addition, the thickness of an absorber and an absorbent article can be measured with the following method, for example. First, the absorbent article is impregnated with liquid nitrogen to freeze the absorbent article. Next, after the absorbent article frozen by a razor is cut, the cut absorbent article is returned to room temperature and thawed. And the thickness of the absorbent article in a cut surface is measured with an electron microscope (Keyence VE7800).

The central region center width W1 that is the length in the width direction of the central region A1 at the center in the longitudinal direction L of the central region A1 is the circumference that is the length in the width direction of the surrounding region A2 at the center in the longitudinal direction L of the central region A1. It is configured to be shorter than the region center width W2. Since the center region center width W1 is longer than the surrounding region center width W2, a region for absorbing body fluid can be secured, and leakage of body fluid can be suppressed.
The peripheral region center width W2 is the width of the peripheral region A2 on an imaginary line passing through the center in the longitudinal direction L of the central region A1 and along the width direction W. In the present embodiment, the surrounding area A2 on the imaginary line is arranged on both sides with the central area A1 in between, and is a length obtained by combining the widths of the two surrounding areas A2 arranged on the side of the central area A1. However, it is comprised so that it may become longer than center area | region center width W1.

  In the absorbent body according to the present invention, when the peripheral region A2 is disposed on both sides in the width direction with respect to the central region A1, the length in the width direction of at least one peripheral region A2 is larger than the length in the width direction of the central region. What is necessary is just to be comprised short. However, more preferably, the total length of the two surrounding regions A2 arranged on the outer side in the width direction of the central region A1 is configured to be shorter than the length of the central region A1 in the width direction. When the length in the longitudinal direction and the length in the width direction of the central region A1 are 50% or more with respect to the length in the longitudinal direction and the length in the width direction of the core portion 31, the thickness is reduced with respect to the wearer. The effect which makes it hard to feel can be exhibited suitably. Further, when the surrounding area A2 is arranged only on one side in the width direction with respect to the central area A1, the length in the width direction of the surrounding area A2 is shorter than the length in the width direction of the central area. Good.

The density of the absorber is different in each of the central region A1, the surrounding region A2, and the thin layer region A3. The density of the absorber 30 in the surrounding area A2 is configured to be lower than the density of the absorber in the central area A1 and lower than the density of the absorber in the thin layer area A3. The density of the absorber in the central region A1 is higher than the density of the absorber in the thin layer region A3. Specifically, the density of the central region A1 is 0.135 g / cm ³ , the density of the surrounding region A2 is 0.068 g / cm ³ , and the density of the thin layer region A3 is 0.12 g / cm 3. ³ . Moreover, the density of the surrounding pressing part is 0.4 g / cm ³ .

  The central area A1 is harder than the surrounding area A2 and the thin layer area A3, and is configured to be difficult to deform. On the other hand, since the peripheral region A2 having a lower density than the central region A1 and the thin layer region A3 is provided around the central region A1, when the absorbent article is pressed inward from the outer side in the width direction, The surrounding area A2 having low rigidity can be deformed to absorb external force, and deformation of the central area A1 can be reduced. Therefore, it becomes easy to maintain center area | region A1 in the planar state which opposes an excretion opening | mouth, the area | region which contacts an excretion opening | mouth is ensured, and it can prevent that the width direction length of an absorber becomes too short. Further, by suppressing the deformation of the central region, it is possible to suppress the deterioration of the wearing feeling due to the relatively hard central region A1 being bent toward the body.

  In addition, the hardness of an absorber and an absorbent article can be measured using the Gurley method prescribed | regulated to JIS-1096, for example. Further, the absorber 30 according to the present embodiment is configured such that the density of the central region A1 is higher than that of the thin layer region A3, but the rigidity of the thin layer region A3 is higher than that of the central region A1. It may be configured.

The basis weight of the absorber is different in each of the central region A1, the surrounding region A2, and the thin layer region A3. The absorber 30 is configured such that the basis weight of the central region A1 located at the center of the absorber is the highest. The basis weight of the surrounding area A2 is higher than the basis weight of the thin layer area A3. Specifically, the basis weight of the central region A1 is 270 g / cm ² , the basis weight of the surrounding region A2 is 150 g / cm ² , and the basis weight of the thin layer region A3 is 120 g / cm ² . Moreover, the basis weight of the surrounding pressing part is 120 g / cm ² . Since the basis weight and density of the central region of the absorbent body where the excretion opening easily comes into contact are configured high, body fluid can be easily drawn in the central region A1. Further, since the density of the absorber in the surrounding area A2 is lower than that in the central area A1, it is possible to suppress the liquid absorbed in the central area A1 from spreading due to the influence of the density gradient.

  In addition, the fabric weight and density of an absorber can be measured with the following measuring methods, for example. In the absorbent article packaged by the packaging body, the packaging body is opened, the folded absorbent article is developed, and the thickness and area of the portion where the basis weight and density are measured are measured. Subsequently, the part which measures a fabric weight and a density is cut out from an absorbent article, and the weight of the cut-out part is measured. Next, parts other than the absorber, such as the top sheet and the back sheet, are removed from the cut out part, and the weight of the absorber is measured. The basis weight is calculated based on the weight of the absorbent body and the area of the portion where the basis weight and density are measured. The density is calculated based on the basis weight and thickness.

  Next, with reference to FIG. 5, a part of manufacturing method of the absorbent article 1 which concerns on this embodiment is demonstrated. In addition, about the method which is not described in FIG. 5, the existing method can be used. The manufacturing method of an absorbent article performs an upper layer production | generation process in step 101, as shown in FIG. Specifically, in the upper layer generation step, the top sheet 10 and the side sheets 41 and 42 are bonded by, for example, a hot melt adhesive. Next, in step 102, an absorbent body first molding step is performed. Specifically, the absorber 30A (see FIG. 8 (a)) is formed by molding pulp as a material of the absorber with a molding drum.

  In step 103, an absorber second molding step is performed. Specifically, the absorbent body 30A molded in step 102 is compressed in the thickness direction T by a pair of compression rolls to form the central region A1, the peripheral region A2, and the thin layer region A3, and the central pressing unit 61 and The thin layer pressing part 63 is formed and the absorber 30 (refer FIG.8 (b)) is shape | molded. In addition, the order of the upper layer production | generation process of step 101 and the absorber 1st shaping | molding process of step 102 and step 103 and an absorber 2nd shaping | molding process may be reverse order.

  In step 104, a joining process for joining the upper layer generated in step 101 and the absorbent body 30B molded in step 103 is performed. In step 105, a pressing process is performed. Specifically, the absorbent body 30 </ b> B and the top sheet 10 are compressed in the thickness direction to form the surrounding compressed portion 62. In step 106, a back sheet joining process is performed. Specifically, in step 105, the absorbent body and the top sheet that have formed the peripheral pressing portion are joined to the back sheet. In addition, although not shown in FIG. 5, after bonding a back surface sheet, the process of apply | coating an adhesive agent is provided.

  Next, the absorber molding second step in step 103 will be described in detail based on FIG. FIG. 6 is a perspective view schematically showing an absorber molding second step of the absorber. FIG. 7 is a cross-sectional view of a compression roll used in the absorber molding second step. FIG. 7 is a cross-sectional view of a cross section along a cross direction in a portion where the upper roll and the lower roll of the compression roll shown in FIG. 6 face each other and along the vertical direction. FIG. 8 is a schematic cross-sectional view of the absorbent body, where (a) shows the absorbent body before the second absorber molding step, and (b) shows the absorbent body after the second absorber molding step. .

  In the second absorbent body molding step, the absorbent body 30A continuously transported along the transport direction MD is compressed between the pair of compression rolls in the thickness direction T. The compression roll 100 includes an upper roll 101 and a lower roll 102 that are arranged to face each other. The upper roll 101 is disposed on the absorber to be conveyed. On the other hand, the lower roll 102 is disposed under the absorber to be conveyed. On the outer peripheral surfaces of the upper roll 101 and the lower roll 102, a mold along the outer shape of the absorber 30 is formed. The upper roll 101 is formed with a compression blade 101 a that protrudes to the lower roll side (radially outward) at a position corresponding to the central pressing portion 61 and the thin layer pressing portion 63 of the absorber 30. The length W101a in the width direction of the compression blade 101a corresponds to the length W1 in the width direction of the central region A1. The lower roll 102 is formed with a recess 102a that is recessed in a direction away from the upper roll (inward in the radial direction). The length W102a in the intersecting direction of the recessed portion 102a corresponds to the length W4 in the width direction W of the core portion 31 (see FIG. 8A).

  As shown in FIG. 8B, the back sheet side surfaces of the central region A1 and the surrounding region A2 of the absorbent body 30B bulge toward the back sheet side corresponding to the recessed portions 102a. As described above, since a part of the absorber 30 is formed to bulge toward the back sheet side, it is possible to reduce the bulge on the top sheet side in the central region and the peripheral region. Moreover, in the core part 31, since the compression blade 101a is formed only in the part corresponding to center area | region A1, and the compression blade 101a is not formed in the area | region corresponding to surrounding area A2, the center pressing part 61 is only formed in center area | region A1. And the central region A1 can be formed thinner than the surrounding region A2.

(Second Embodiment)
Next, the absorbent article according to the second embodiment will be described in detail with reference to FIGS. 9 and 10. The absorbent article according to the second embodiment is different from the first embodiment in the configuration of the absorber, but the other configurations are the same. FIG. 9 is a cross-sectional view of a compression roll used in an absorbent body molding second step in the method for manufacturing an absorbent article according to the second embodiment. FIG. 10 is a schematic cross-sectional view of an absorbent body 32 according to the second embodiment, where (a) shows the absorbent body 32A before the second stage of absorbent body molding, and (b) second absorbent body molding. The absorber 32B after the process is shown.

  The compression roll 200 includes an upper roll 201 and a lower roll 202 that are arranged to face each other. The upper roll 201 is disposed on the conveyed absorbent body. On the other hand, the lower roll 202 is arranged under the absorber to be conveyed. On the outer peripheral surfaces of the upper roll 201 and the lower roll 202, a mold along the outer shape of the absorber 30 is formed. The upper roll 201 is formed with a compression blade 201a protruding to the lower roll side (radially outward) over the entire width of the absorber. The lower roll 202 is formed with a recess 202a that is recessed in a direction away from the upper roll 201 (in the radial direction). The length W202a in the intersecting direction of the recess 202a is longer than the length W4 of the core 31 in the width direction.

  As shown in FIG.8 (b), the area | region corresponding to the dent part of the absorber 32B swells to the back surface sheet side. The core part 31 is compressed so as to have the same thickness over the entire surface. The absorbent body on the outer side in the width direction with respect to the core part 31 is thinner than the core part 31 in the thickness of the absorbent body 30A, but is less in compression than the core part 31 because it contacts the recessed part 202a together with the core part 31. Therefore, the area corresponding to the core portion 31 has the highest density and becomes the central area A1. A portion on the outer side in the width direction with respect to the central region A1 and in contact with the recessed portion 201a has a lower density than the central region A1, and becomes a peripheral region A2. Even with the absorbent article having the absorbent body configured as described above, the peripheral region A2 having a relatively low density can be provided around the central region A1, so that when the force is applied from the outside in the width direction, the peripheral region The deformation of the central region can be suppressed. Furthermore, since the length W202a in the width direction W of the recess is longer than the length W4 in the width direction of the core portion 31, the position of the absorber is slightly shifted (for example, about 10 mm) in the crossing direction in the manufacturing process. Even so, the central region and the surrounding region can be formed.

  Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  In addition to the sanitary napkin, the absorbent article according to the present invention may be a panty liner (cage sheet), an incontinence pad, a disposable diaper, or the like. Further, for example, in each embodiment shown in the drawings, the shape and size of the central pressing portion and the thin layer pressing portion are configured to be the same, but the performance required in the central region A1 and the thin layer region A3. You may comprise so that the shape and size of a pressing part may differ according to the difference.

The absorber may contain a polymer or may not contain a polymer. Furthermore, although the absorber in the said embodiment is laminated | stacked and comprised by basis weight 100-300 g / m < ² >, such as cotton-like pulp and synthetic pulp, the basis weight of an absorber is 50-400 g / m < ² >. You may adjust suitably in the range. In addition, the shape of the back sheet and the absorbent body of the absorbent article, these materials, and the like are not limited to those shown in the embodiment, and for example, a gather may be provided on the side sheet.

  DESCRIPTION OF SYMBOLS 1 ... Absorbent article, 10 ... Top sheet, 20 ... Back sheet, 30, 30A, 30B, 32, 32A, 32B ... Absorber, 31 ... Core part, 41, 42 ... Side seed, 43, 44 ... Wing part, DESCRIPTION OF SYMBOLS 50 ... Adhesive, 61 ... Central pressing part, 62 ... Ambient pressing part, 63 ... Thin layer pressing part, 75 ... Adhesive tape, A1 ... Central area, A2 ... Surrounding area, A3 ... Thin layer area, 100,200 ... Compression Roll, 101, 201 ... Upper roll, 101a, 201a ... Compression blade, 102, 202 ... Lower roll, 102a, 202a ... Recess

Claims (6)

An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet,
The absorbent article has a longitudinal direction and a width direction orthogonal to the longitudinal direction,
The absorber has a central region including the center of the excretory opening contact region, and a peripheral region disposed adjacent to the central region around the central region,
The density of the absorber in the surrounding region is lower than the density of the absorber in the central region,
The central area is provided with a central squeezed portion in which the absorber is squeezed in the thickness direction,
The thickness of the absorber in the central region rather thin than the thickness of the absorber of the surrounding area,
The absorbent body is provided with a thin layer region that surrounds the surrounding region and is thinner than the surrounding region.
The absorbent article in which the absorbent body in the central region and the surrounding region swells closer to the back sheet side than the absorbent body in the thin layer region .   The absorbent article according to claim 1, wherein a plurality of the central pressing parts are provided in the central region.   The absorptive article according to claim 1 or 2 whose length of said width direction of said central pressing part is longer than the length of said longitudinal direction of said central pressing part. The absorbent article in any one of Claims 1-3 in which the surrounding pressing part by which the said surface sheet and the said absorber were squeezed in the thickness direction is provided in the outer edge of the said surrounding area | region. The central region and the surrounding region are elliptical shapes extending in the longitudinal direction,
The length in the width direction of the central region at the center in the longitudinal direction of the central region is defined as a central region central width, and the length in the width direction of the surrounding region at the center in the longitudinal direction of the central region. When the surrounding area is the center width,
The absorbent article according to any one of claims 1 to 4 , wherein the central area center width is longer than the peripheral area center width. An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet,
The absorbent article has a longitudinal direction and a width direction orthogonal to the longitudinal direction,
The absorber includes a central region including the center of the excretory opening contact region, a peripheral region disposed adjacent to the central region around the central region, and disposed around the peripheral region and the peripheral region And a thin layer region that is thinner than
The density of the absorber in the surrounding region is lower than the density of the absorber in the central region,
The central area is provided with a central squeezed portion in which the absorber is squeezed in the thickness direction,
On the outer edge of the surrounding area, a surrounding pressing part is formed by pressing the top sheet and the absorber in the thickness direction,
In the thin layer region, a thin layer pressing part is formed by pressing the absorber in the thickness direction,
The length in the width direction of the central compressed portion is longer than the length in the longitudinal direction of the central compressed portion,
Of the thin layer compressed portion of the thin layer region, the length in the width direction of the thin layer compressed portion arranged on the outer side in the longitudinal direction with respect to the surrounding region is greater than the length of the thin layer compressed portion in the longitudinal direction. Too long
The central region and the surrounding region are elliptical shapes extending in the longitudinal direction,
The length in the width direction of the central region at the center in the longitudinal direction of the central region is defined as a central region central width, and the length in the width direction of the surrounding region at the center in the longitudinal direction of the central region. In the case of the surrounding area center width, the center area center width is longer than the surrounding area center width,
The thickness of the absorber in the central region rather thin than the thickness of the absorber of the surrounding area,
The thin layer region surrounds the surrounding region;
The absorbent article in which the absorbent body in the central region and the surrounding region swells closer to the back sheet side than the absorbent body in the thin layer region .

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