JP5515536B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article that includes an absorbent body, a top sheet, and a back sheet, and that contains a superabsorbent polymer in the absorbent body.

  In general, absorbent articles such as disposable diapers and urine pads are composed of an absorbent body, a top sheet at least partially made of a liquid-permeable material, and arranged to cover the surface of the absorbent body, and a liquid-impermeable material. And a back sheet disposed so as to cover the back surface of the absorber.

  In such an absorbent article, fluff pulp, a super absorbent polymer (hereinafter referred to as “SAP”), a hydrophilic sheet, or the like is used as an absorbent material constituting the absorbent body. .

  However, when an absorbent containing granular SAP is used, there is a problem in that SAP is easily dropped from the absorbent, and the dropped SAP falls out of the absorbent article from the gap between the top sheet and the back sheet. It has been pointed out (see Patent Document 1). If the SAP spills out of the absorbent article, the absorbent performance of the absorbent article is reduced, and urine cannot be sufficiently absorbed. This may cause urine leakage, and the top sheet may feel wet. There is a problem of remaining indefinitely and worsening the wearing feeling.

  By the way, in a disposable diaper, the leg periphery elastic material may be attached along the leg periphery opening part for the purpose of improving the fit property around the leg and preventing leakage from the leg periphery. Further, in the urine pad, an elastic material around the legs may be attached to both side edges for the same purpose. An absorbent article provided with such a leg-stretchable material is, for example, after an absorbent body, a top sheet, a back sheet, a leg-stretchable material, etc., supplied in a long state are laminated and fixed to form a laminate. It is continuously manufactured by a method of cutting into product lengths. At this time, the elastic material around the long leg should be adhered only to the crotch part of the absorbent article, not on the front body side and the back body side, and the long top sheet and back sheet should be completely adhered. Instead, an interlayer gap is formed between the sheets.

  By doing so, the stretchable material around the long leg is cut at the same time as the laminate is cut into the product length, and is drawn into the absorbent article from the interlayer gap between the top sheet and the back sheet. As described above, due to a demand in the manufacturing method, an interlayer gap is formed between the top sheet and the back sheet on the extension line of the leg-around elastic material. The SAP spills out of the absorbent article from the interlayer gap.

  On the other hand, the absorbent article described in Patent Document 1 forms a notch at the front end portion and the rear end portion of the absorbent body, and covers the portions with a sheet member, so that the SAP is outside the absorbent article. I'm trying to prevent it from falling down.

Japanese Patent No. 3657251

  However, the absorbent article described in Patent Document 1 has a problem that the area of the absorbent body is substantially reduced by forming the notch portion, and urine leakage is likely to occur.

  The present invention has been made in view of such problems of the prior art. In addition to being able to effectively prevent SAP from spilling out of the absorbent article, the present invention has excellent absorption performance and urine leakage. It is an object of the present invention to provide an absorbent article that is less likely to cause a wet feeling and does not remain wet on the top sheet, and can provide a light wearing feeling.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventor has 1) an absorber having a two-layer structure of a narrow absorber and a wide absorber, and 2) the narrow absorber. The above problem is achieved by laminating the wide absorbent body so as to form the ears protruding from both side edges, and 3) fixing the narrow absorbent body in a state of being pressed from both side edges by the wide absorbent ears. As a result, the present invention has been completed. Specifically, the following absorbent articles are provided by the present invention.

[1] An absorbent body formed from the front body, the crotch part, and the back body, including fluff pulp and a superabsorbent polymer, and at least a part of a liquid-permeable material so as to cover the surface of the absorbent body And a back sheet made of a liquid-impermeable material and disposed so as to cover the back surface of the absorber, the top sheet and the back sheet, In the region on the front end side from the arrangement site and in the region on the rear end side from the arrangement site of the absorber, it is bonded so as to form an interlayer gap that communicates between the absorber and the external space. And a narrow absorbent body disposed in the center in the width direction of the absorbent article and a wide absorbent body in which at least one of the front end portion and the rear end portion is formed wider than the narrow absorbent body. Presents a layered structure The wide absorbent body is laminated with the narrow absorbent body so that ears protruding from both side edges of the narrow absorbent body are formed, and a region where the narrow absorbent body is arranged is the narrow absorbent body And the two-layer structure composed of the wide absorbent body , the ear portion is in a region outside both side edges of the narrow absorbent body, the sheet material to which the narrow absorbent body is fixed , An absorbent article that is bonded and fixed in a state where the narrow absorbent body is pressed from both side edges by the ears of the wide absorbent body .

[2] The laminate of the narrow absorbent body and the wide absorbent body is integrally encapsulated by an absorbent encapsulating sheet made of a liquid-permeable material, and the ears of the wide absorbent body are The absorbent article according to [1], wherein the absorbent article is bonded and fixed to the absorbent encapsulating sheet to which the narrow absorbent body is fixed in a region outside both side edges of the narrow absorbent body.

[3] A joint part in which the ear part is formed on each of the front body side and the back body side of the absorbent article, and the ear part is joined and fixed to a sheet material on which the narrow absorbent body is secured. However, the absorbent article according to [1] or [2], wherein each pair is formed on both the front end portion and the rear end portion of the wide absorbent body.

[ 4 ] A pair of the ear portions formed on both the front body side and the rear body side of the absorbent article, and the ear portions are joined and fixed to a sheet material on which the narrow absorbent body is fixed. However, the absorbent article in any one of said [1]-[ 3 ] currently formed intermittently in the front-end part and rear-end part of the said wide absorbent body.

[ 5 ] The absorptivity according to any one of [1] to [ 4 ], wherein the narrow absorbent body is composed of fluff pulp and a superabsorbent polymer, and the wide absorbent body is composed of fluff pulp. Goods.

[ 6 ] The absorbent article according to any one of [1] to [ 5 ], wherein a superabsorbent polymer layer is interposed between the narrow absorbent body and the wide absorbent body.

  The absorbent article of the present invention can effectively prevent SAP from spilling to the outside of the absorbent article, has excellent absorption performance, is unlikely to leak urine, and feels wet on the top sheet forever. It does not remain and can give a light wearing feeling.

It is a schematic plan view which shows the state which expand | deployed the absorbent article of this invention and was seen from the top sheet side. FIG. 1B is a schematic end view schematically showing an A-A ′ end face of the absorbent article shown in FIG. 1A. FIG. 1B is a schematic end view schematically showing a B-B ′ end surface of the absorbent article shown in FIG. 1A. FIG. 1B is a schematic end view schematically showing a C-C ′ end surface of the absorbent article shown in FIG. 1A. It is a schematic perspective view which shows the use condition of the absorbent article shown to FIG. 1A. It is a schematic plan view which shows another embodiment of the absorbent article of this invention, is a figure which shows the state which expand | deployed the absorbent article and was seen from the top sheet side. FIG. 2B is a schematic end view schematically showing an A-A ′ end surface of the absorbent article shown in FIG. 2A. FIG. 2B is a schematic end view schematically showing a B-B ′ end face of the absorbent article shown in FIG. 2A. It is a schematic plan view which shows another embodiment of the absorbent article of this invention, and is a figure which shows the state which expand | deployed the absorbent article and was seen from the top sheet side. FIG. 3B is a schematic end view schematically showing an A-A ′ end face of the absorbent article shown in FIG. 3A. FIG. 3B is a schematic end view schematically showing a part of the B-B ′ end face of the absorbent article shown in FIG. 3A.

  Hereinafter, the best mode for carrying out the absorbent article of the present invention will be specifically described with reference to an example of a tape-type disposable diaper. However, the present invention broadly includes absorbent articles (for example, urine pads, pants-type disposable diapers, etc.) having the invention-specific matters, and are not limited to the following embodiments.

[1] Definitions etc .:
The “tape-type disposable diaper” includes an absorbent body 22, a top sheet 18, and a back sheet 20 as in the absorbent article 1 </ b> A shown in FIGS. 1A to 1C, and left and right side edges of the back body 6. The disposable diaper further provided with the fastening tape 11 which fixes the front body 2 and the back body 6 arrange | positioned so that it may extend from 6a, 6b shall be meant.

  As shown in FIG. 1A and FIG. 1E, the “front body” is a portion (reference numeral 2 in the figure) that covers the abdomen (front of the body) of the wearer when worn on the wearer, and “inseam” The part that covers the inseam of the wearer when attached to the wearer (reference numeral 4 in the figure), and the “rear body” is the part that covers the back side (back of the body) of the wearer when worn on the wearer (6 in the figure) is meant.

[2] Embodiment of the present invention:
In the absorbent article of the present invention, as in the absorbent article 1A shown in FIG. 1D, the top sheet 18 and the back sheet 20 are located on the front end side of the absorbent body 22 and the rear part of the absorbent body 22. Bonding is performed so that an interlayer gap 60 that communicates between the absorber 22 and the external space is formed in the end region.

  When the interlayer gap is formed along the arrangement part of the elastic material around the legs, when the absorbent article is continuously manufactured, the absorbent body supplied in a long state, the top sheet, the back sheet, Cut the laminate with the leg elastics laminated and fixed to the product length and simultaneously cut the long leg elastics and draw them into the absorbent article from the gap between the top sheet and the back sheet. It becomes possible to do so. That is, it is possible to prevent a problem that the absorbent article is unnecessarily contracted and rounded without arranging an elastic material at the front end portion and the rear end portion of the absorbent article. In addition, when the said interlayer gap is formed in parts other than the arrangement | positioning part of the leg periphery elastic material, it becomes possible to improve the air permeability of an absorbent article.

  Moreover, as for the absorbent article of this invention, like the absorbent article 1A shown to FIG. 1A-FIG. 1D, the absorber 22 has the narrow absorber 50 arrange | positioned in the center part of the width direction of an absorbent article, and a front end. The wide absorbent body 52 has a two-layer structure in which at least one of the front and rear end portions is laminated with a wide absorbent body 52 formed wider than the narrow absorbent body 50, and the wide absorbent body 52 has both side edges of the narrow absorbent body 50. The sheet is laminated with the narrow absorbent body 50 so as to form protruding ears, and the ear part is a sheet to which the narrow absorbent body 50 is fixed in a region outside both side edges of the narrow absorbent body 50. It is bonded and fixed to a material (in this example, the absorber encapsulating sheet 54).

  When the absorber is not encapsulated by the absorber encapsulating sheet or when the absorber 22 is encapsulated by the absorber encapsulating sheet 54 as shown in FIG. When both side surfaces are exposed, the SAP is easily dropped from the side edge side of the absorber 22. In such a case, the side edges (particularly both side surfaces) of the narrow absorbent body are pressed by the wide absorbent ears to suppress the kinks of the wide absorbent body and the narrow absorbent body. Is difficult to fall off, and both side surfaces of the narrow absorbent body are blocked, and SAP leakage from the side edges of the narrow absorbent body is effectively prevented. Furthermore, the feeling of wearing is improved by suppressing the kinking of the absorber.

[2-1] Interlayer gap:
In the absorbent article of the present invention, as shown in FIG. 1D, the top sheet 18 and the back sheet 20 are located on the front end side of the absorbent article with respect to the absorber placement site and the area after the absorbent article with respect to the absorber placement site. Bonding is performed so that an interlayer gap 60 that communicates between the absorber and the external space is formed in the end region.

  The interlayer gap may be formed not only between the center sheet and the back sheet but also between the side sheet and the back sheet. For example, as shown in FIGS. 1A to 1D, a pair of side sheets 18b made of a water repellent material and joined to both side edges of the center sheet 18a, and at least a pair disposed between the side sheets 18b and the back sheet 20 are provided. In the structure further including the leg-surrounding elastic member 40, the side sheet 18b and the back sheet 20 are a region on the front end side from the arrangement portion of the absorber 22 and a region on the rear end side from the arrangement portion of the absorber 22. Are bonded together so as to form an interlayer gap 60 that communicates between the absorbent body 22 and the outer space of the absorbent article, and the leg-surrounding stretchable material 40 has a side sheet 18b and a backsheet only at the center in the longitudinal direction. It is preferable to be sandwiched and fixed between the bonded portions 20 and the both ends in the longitudinal direction are in an unfixed state.

[2-2] Structure of absorber:
In the absorbent article of the present invention, the absorbent body 22 has a two-layer structure in which a narrow absorbent body 50 and a wide absorbent body 52 are laminated, like the absorbent article 1A shown in FIGS. 1A to 1C. That is, the absorber 22 has an upper and lower two-layer structure. When the absorber has a two-layer structure, two types of absorbers having different materials and shapes can be arranged according to required characteristics.

  In the present invention, since the absorber has an upper and lower two-layer structure, when the narrow absorber and the wide absorber are laminated, the thickness becomes a thickness equivalent to a normal absorber (about 2 to 10 mm). It is preferable to do. Therefore, the thickness of each absorber is preferably 1 mm or more, and is preferably 8 mm or less. The narrow absorber and the wide absorber may have different thicknesses, but are usually formed to the same thickness. The narrow absorbent body and the wide absorbent body are fixed so as not to deviate from each other. You may join by an adhesive agent etc.

  A narrow absorber is arrange | positioned in the width direction center part of an absorbent article. The wide absorbent body is an absorbent body in which at least one of the front end portion and the rear end portion is formed wider than the narrow absorbent body. In the absorbent article 1A shown in FIGS. 1A to 1D, the narrow absorbent body 50 is disposed in the lower layer and the wide absorbent body 52 is disposed in the upper layer. However, the narrow absorbent body is disposed in the upper layer, and the wide absorbent body is disposed. Those arranged in the lower layer are also included in the scope of the present invention. Moreover, in the example shown to FIG. 1A and FIG. 1D, although both the front-end part and rear-end part of a wide absorber are formed more widely than a narrow absorber, either one of the front-end part and rear-end part of a wide absorber In the scope of the present invention, is formed wider than the narrow absorber.

  Generally, as an absorptive material which constitutes an absorptive article of an absorptive article, fluff pulp, super absorbent polymer (SAP), a hydrophilic sheet, etc. are used, for example. However, in the absorbent article of the present invention, an absorber containing fluff pulp and a superabsorbent polymer is used.

  This takes into account the difference in absorption characteristics between SAP and fluff pulp. That is, although SAP has a large absorption amount per unit mass, it has a characteristic that the initial absorption rate is slow, and fluff pulp has a characteristic that the initial absorption rate is fast although the absorption amount per unit mass is not as large. Therefore, according to the structure, urine can be once absorbed and retained by the fluff pulp, and the urine absorbed and retained by the fluff pulp can be gradually absorbed by the SAP.

  Among them, it is preferable that the narrow absorbent body is composed of fluff pulp and a highly water-absorbing polymer, and the wide absorbent body is composed of fluff pulp. That is, it is preferable that the narrow absorber is a SAP-containing absorber and the wide absorber is a SAP-free absorber. By disposing a narrow absorbent body containing SAP at the center in the width direction of the absorbent article, it is possible to improve the absorption performance at the center in the width direction of the absorbent article where urine is most easily excreted. Moreover, it is possible to effectively prevent the SAP from falling off and leaking from both side edges of the narrow absorbent body by pressing the both side edges of the narrow absorbent body containing SAP by the wide absorbent body not containing SAP.

  As the fluff pulp, wood pulp or non-wood pulp defibrated in a cotton-like form can be used. As the SAP, sodium polyacrylate can be used.

  As the wide absorbent body and the narrow absorbent body, it is preferable to use a pulp mat obtained by forming fluff pulp into a mat shape. At this time, the pulp mat may be used as a single layer or a laminate of a plurality of layers. As a form in which the absorbent contains SAP, SAP particles may be dispersed in the pulp mat, or an SAP layer formed in a plate shape between two or more layers of the pulp mat may be interposed. You may arrange. The narrow absorbent body is preferably a combination of 10 to 200 parts by mass of SAP and more preferably a combination of 40 to 80 parts by mass of SAP with respect to 100 parts by mass of fluff pulp. The wide absorbent is preferably used in combination with 0 to 100 parts by mass of SAP, more preferably 0 to 40 parts by mass of SAP, and 100% by mass of fluff pulp. Those composed only of pulp) are particularly preferred.

  In the absorbent article of the present invention, as shown in FIGS. 1A to 1C, the wide absorbent body 52 is laminated with the narrow absorbent body 50 so that the ears protruding from both side edges of the narrow absorbent body 50 are formed. ing. In such a structure, the central portion in the width direction of the absorbent body 22 that requires a large amount of urine excretion and has an absorption capacity has a two-layer structure, so that sufficient absorption capacity can be secured and the amount of urine excretion can be reduced. Since the wide absorbent body 52 is also arranged for a few ears, leakage can be sufficiently prevented. In particular, when the narrow absorbent body 50 is composed of fluff pulp and SAP and the wide absorbent body 52 is composed only of fluff pulp, the width direction of the absorbent body 22 that requires a large amount of urine excretion and absorbency is required. Since SAPs are centrally arranged in the central part, the used SAPs can be used efficiently.

  In the structure, as shown in FIGS. 1B and 1C, it is preferable that a highly water-absorbing polymer layer (SAP layer 58) is interposed between the narrow absorbent body 50 and the wide absorbent body 52. With such a structure, the SAP is concentratedly arranged at the central portion in the width direction of the absorber 22 where a large amount of urine is excreted and absorption capacity is required, so that the used SAP can be used efficiently. . In particular, when the narrow absorbent body 50 is composed of fluff pulp and SAP and the wide absorbent body 52 is composed only of fluff pulp, the SAP layer 58 is combined with SAP contained in the narrow absorbent body 50. It contributes to improving the absorption performance in the center of the absorbent article in the width direction.

The SAP layer 58 may be formed by dispersing SAP particles between the narrow absorber 50 and the wide absorber 52, or an SAP formed in a plate shape between the narrow absorber 50 and the wide absorber 52. You may form by inserting | pinching so that it may be interposed. The amount of SAP contained in this SAP layer is preferably 50 to 200 g / m ² .

  In the said structure, at least one of the front-end part and rear-end part of a wide absorber should just be formed wider than a narrow absorber. In other words, as long as at least one of the front end portion and the rear end portion of the wide absorbent body is formed wider than the narrow absorbent body, the wide absorbent body 52 as in the absorbent article 1A shown in FIGS. 1A to 1C. A portion (center portion) other than the front end portion and the rear end portion may be formed wider than the narrow absorbent body 50. In the illustrated example, the wide absorbent body 52 is formed in an hourglass shape, and includes a front end portion (a portion of the wide absorbent body 52 disposed in the front body 2) and a rear end portion (the back body 6 of the wide absorbent body 52. In addition, the central portion (the portion disposed in the crotch 4 of the wide absorbent body 52) is also formed wider than the narrow absorbent body 50.

  In this specification, as shown in FIGS. 1A to 1C, the “ear part of the wide absorbent body” means a portion of the wide absorbent body 52 that protrudes from both side edges of the narrow absorbent body 50, and the narrow absorbent body. A portion protruding parallel to the side edge of the body 50 is also included. For example, in the absorbent article 1A shown in FIGS. 1A to 1C, not only the front end portion and the rear end portion of the wide absorbent body 52 but also the ear portions protruding from both side edges of the narrow absorbent body 50 are formed in the center portion. Will be.

  The width of the narrow absorbent body is preferably 180 to 185 mm. The width of the wide absorbent body relative to the width of the narrow absorbent body is preferably 1.0 to 2.5 times at the front end portion and the rear end portion of the wide absorbent body, and 1 at the central portion of the wide absorbent body. It is preferable to be -1.4 times. It is preferable that the length (the length from the narrow absorbent side edge to the wide absorbent side edge) of the wide absorbent body is 180 to 450 mm at the front end portion and the rear end portion of the wide absorbent body. It is preferable to set it as 180-252 mm in the center part of a body.

  The planar shapes of the wide absorbent body and the narrow absorbent body are not particularly limited as long as the wide absorbent body has a shape that can protrude from both side edges of the narrow absorbent body to form an ear part. In general, the absorber is formed in a planar shape such as a rectangular shape, an hourglass shape, a gourd shape, or a T-shape, and therefore, a shape that meets the above conditions may be appropriately selected from these shapes. For example, the absorbent article 1A shown in FIGS. 1A to 1C is an example in which the wide absorbent body 52 is formed in an hourglass shape and the narrow absorbent body 50 is formed in a rectangular shape.

[2-3] Form of joint part:
In the absorbent article of the present invention, as shown in FIGS. 1A to 1C, the narrow absorbent body 50 is fixed to the ear portion of the wide absorbent body 52 in the region outside the both side edges of the narrow absorbent body 50. It is bonded and fixed to the sheet material (in this example, the absorber encapsulating sheet 54) (bonding portion 62A). In such a structure, the narrow absorbent body can be pressed from both side edges by the wide absorbent body, making it difficult to squeeze the narrow absorbent body and suppressing SAP leakage from both side faces of the narrow absorbent body. The joining can be performed by adhesion using an adhesive (such as a hot melt adhesive).

  The absorber is preferably encapsulated by an absorber encapsulating sheet made of a hydrophilic sheet for the purpose of preventing SAP from falling off and imparting shape stability. Therefore, in the absorbent article of the present invention, as in the absorbent article 1A shown in FIG. 1C, the laminated body of the narrow absorbent body 50 and the wide absorbent body 52 is made of an absorbent encapsulating sheet 54 made of a liquid permeable material. , 56 are integrally encapsulated, and the ears of the wide absorbent body 52 are attached to the absorbent body encapsulating sheet 54 to which the narrow absorbent body 50 is fixed in the region outside both side edges of the narrow absorbent body 50. A form that is bonded and fixed is preferable.

  More specifically, as shown in FIGS. 1A and 1C, a pair of joint portions 62A for joining and fixing the ear portions of the wide absorbent body 52 are formed on both the front end portion and the rear end portion of the wide absorbent body 52, respectively. Are preferred. This joining form is preferable in that the amount of adhesive applied can be reduced and the production cost can be reduced as compared with the joining form (joining part 62B) shown in FIGS. 2A to 2C. In the example shown in the drawing, the joint portions 62A are formed at four portions protruding from the left and right of the hourglass-shaped wide absorbent body 52.

  Moreover, as shown in FIGS. 2A to 2C, it is also preferable that the joining portion 62 </ b> B for joining and fixing the ear portion of the wide absorbent body 52 is continuously formed from the front end portion to the rear end portion of the wide absorbent body 52. . Compared with the bonding mode (bonding part 62A) shown in FIGS. 1A to 1C, this bonding mode is performed by the wide absorbent body 52 from the front end portion to the rear end portion. Since both side edges are pressed down continuously, it is preferable in terms of a high anti-shrinking effect and a high SAP leakage suppressing effect. In the illustrated example, a joint portion 62B having an equal width is continuously formed from the front end portion to the rear end portion of the hourglass-shaped wide absorbent body 52.

  Furthermore, as shown to FIG. 3A-FIG. 3C, the ear | edge part is each formed in both the front body side and the back body side of an absorbent article, and the sheet | seat with which the narrow absorber 50 is fixed to the ear | edge part. It is also preferable that the joining portion to be joined and fixed to the material (in this example, the absorber encapsulating sheet 54) is formed intermittently at the front end portion and the rear end portion of the wide absorbent body 52.

  3A to 3C are preferable in that the application amount of the adhesive can be reduced and the production cost can be reduced as compared with the joining portion 62A shown in FIGS. 1A to 1C. In the illustrated example, three rectangular joints 62 </ b> C are intermittently formed at four portions of the hourglass-shaped wide absorbent body 52 that protrude from the left and right.

  In the absorbent article of the present invention, the ear portion of the wide absorbent body is bonded and fixed to the sheet material on which the narrow absorbent body is fixed. In order to hold down both side edges of the narrow absorbent body, the ears of the wide absorbent body are bonded and fixed on a plane continuous with the fixed surface of the narrow absorbent body. For example, in the absorbent article 1A shown in FIGS. 1A to 1C, the entire absorbent body 22 is encapsulated by the absorbent encapsulating sheets 54 and 56, and the narrow absorbent body 50 is bonded and fixed to the absorbent encapsulating sheet 54. ing. Therefore, the wide absorbent body 52 is also bonded and fixed to the absorbent encapsulating sheet 54. If the narrow absorbent body 50 is disposed in the upper layer and the wide absorbent body 52 is disposed in the lower layer, and the narrow absorbent body 50 is bonded and fixed to the absorbent encapsulating sheet 56, the wide absorbent body 52 is also the absorbent encapsulating sheet. What is necessary is just to join and fix to 56.

  In addition, when the absorber is not encapsulated in the absorber encapsulating sheet and is interposed between the top sheet and the back sheet in an exposed state, the narrow absorber is bonded and fixed to the top sheet or the back sheet. Will be. In this case, the ears of the wide absorbent body are also bonded and fixed to the top sheet or the back sheet. Specifically, when the narrow absorbent body is disposed in the lower layer and the wide absorbent body is disposed in the upper layer and the narrow absorbent body is bonded and fixed to the back sheet, the wide absorbent body may be bonded and fixed to the back sheet. Conversely, when the narrow absorbent body is disposed in the upper layer and the wide absorbent body is disposed in the lower layer and the narrow absorbent body is joined and fixed to the top sheet, the wide absorbent body may be joined and fixed to the top sheet.

[3] Other components of the absorbent article:
The absorbent article of the present invention is formed from the front body 2, the crotch part 4 and the back body 6 as in the absorbent article 1A shown in FIGS. 1A to 1C. A top sheet 18 that is partially made of a liquid-permeable material and arranged to cover the surface of the absorber 22, and a back that is made of a liquid-impermeable material and arranged to cover the back surface of the absorber 22. And a sheet 20.

[3-1] Top sheet:
Since the top sheet needs to allow the wearer's urine or the like to pass therethrough, at least a part (all or a part) of the top sheet is made of a liquid-permeable material.

  In the present invention, the term “top sheet” includes a sheet material arranged so as to cover the surface of the absorbent body, in other words, all the sheet materials that come into contact with the skin of the wearer. That is, in the example of the absorbent article 1A shown in FIG. 1A, not only the liquid-permeable center sheet 18a but also the water-repellent side sheet 18b arranged so as to be joined to the side edges thereof are also included in the present invention. It is included in the “top sheet (reference numeral: 18 in the figure)”.

  Examples of the “liquid permeable material” include woven fabric, non-woven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As the “nonwoven fabric”, a nonwoven fabric produced by a production method such as air through (card hot air) or card embossing can be suitably used. The “hydrophilic treatment” can be performed by applying, spraying, impregnating, etc. a surfactant.

  The top sheet is preferably “at least partly”, more specifically, when the top sheet is viewed in plan, at least the vicinity of the surface of the absorber is made of a liquid-permeable material.

  In addition, the sheet | seat located in the wearer's skin side of an absorbent article does not need to be comprised with all the top sheets. That is, the sheet in contact with the wearer's skin may be constituted by a plurality of sheets including the top sheet, and the top sheet and other sheets may be joined together in the surface direction of the sheet.

  For example, the absorbent article 1A shown in FIGS. 1A to 1C is an example in which two types of sheet materials are used as the top sheet 18, and a center sheet 18a made of a liquid-permeable material is provided at the center in the width direction of the absorbent article. And a side sheet 18b made of a breathable water-repellent material exhibiting resistance to liquid permeation is disposed in the side flap 8 portion of the absorbent article. The ventilated water-repellent sheet may be a non-woven fabric produced by a method such as card embossing or spunbond, but a non-woven fabric sheet such as SMS or SMMS having a high waterproof property is more preferable.

[3-2] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface located in the side far from a wearer's skin at the time of mounting | wearing of an absorbent article) of an absorber may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the absorbent article.

  There is no restriction | limiting in particular about the arrangement position of a back seat | sheet. From the viewpoint of preventing leakage of urine absorbed by the absorber, it is preferable that a back sheet is disposed at least in a portion where the absorber exists.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid-impermeable but has moisture permeability, so it is possible to prevent stuffiness inside the absorbent article. There is an advantage.

  Note that, as shown in FIG. 1B, a cover sheet 24 may be bonded to the outer surface side of the back sheet 20. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[3-3] Solid gathering:
The absorbent article of the present invention is preferably made of a water-repellent sheet and includes at least a pair of three-dimensional gathers arranged on both sides of the absorbent body.

  The structure of a three-dimensional gather can employ | adopt the structure used for the conventional absorbent article and other absorbent articles. For example, as in the absorbent article 1A shown in FIG. 1B, an elastic material (three-dimensional gather elastic material 36) is sandwiched and fixed between layers of the water-repellent side sheet 18b, and gathers ( What formed i) etc. can be used conveniently. In these examples, the three-dimensional gather stretchable material 36 is sandwiched and fixed to the folded portion of the water-repellent side sheet 18b.

  The three-dimensional gather may be separately provided with a water-repellent sheet for three-dimensional gather as described above, or may be formed by a part of the sheet material constituting the absorbent article. For example, the absorbent article 1A shown in FIG. 1B is an example in which the three-dimensional gathers 26a and 26b are formed by a part of the water-repellent side sheet 18b. The water-repellent sheet may be a nonwoven fabric produced by a production method such as card embossing or spunbonding, but a nonwoven fabric sheet such as SMS or SMMS having a high waterproof property is more preferable.

[3-4] Fastening tape:
When the absorbent article of the present invention is a tape-type disposable diaper, as shown in FIG. 1A, the front body 2 arranged so as to extend from the left and right side edges 6a, 6b of the back body 6, A fastening tape 11 for fixing the back body 6 is provided.

The fastening member of the fastening tape may be an adhesive fastener that is fixed by an adhesive, but a mechanical fastener that is fixed by mechanical coupling (surface fastener).
Is preferably used.

  For example, the absorbent article 1A shown in FIG. 1A is an example in which a mechanical fastener is used as a fastening member. A hook material 46 is attached near the tip of the fastening tape 11, while a front patch made of a loop material 13 is attached to the front body 2, and the hook of the fastening tape 11 is attached to the front patch. It is comprised so that the material 46 can be stopped.

  The number of fastening tapes is not particularly limited, and an appropriate number of fastening tapes may be attached according to the dimensions of the wearer's body shape (specifically, around the waist, around the legs, etc.). Generally, a pair of tape-type disposable diapers for infants (one on the left and one on the left) is provided, and a pair of tape-type disposable diapers for adults (two on the left and on the right) are provided.

[3-5] Various elastic materials:
In the absorbent article of the present invention, it is preferable to arrange an elastic material around the legs.

  In the case of a disposable diaper, the leg-around elastic material is an elastic material arranged along the leg-hole opening, and in the case of a urine pad, it is an elastic material arranged along both side edges of the urine pad. By disposing the leg stretchable material, it is possible to form a gather (leg gather) rich in stretch along the wearer's leg circumference.

  For example, the absorbent article 1A shown in FIG. 1A is a tape-type disposable diaper, which is an example in which leg gathers are formed by arranging four leg-around elastic members 40 linearly along the longitudinal direction of the diaper. The leg-surrounding elastic member 40 is made of thread rubber or flat rubber.

  For example, the leg elastic member 40 is preferably formed on the outer side of the standing line of the three-dimensional gather 26 as in the absorbent article 1A shown in FIG. 1A.

  When the absorbent article of the present invention is a disposable diaper, it is preferable to arrange an elastic material around the waist in addition to the elastic material around the legs.

  The waist elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening.

  For example, 1 A of absorbent articles shown to FIG. 1A-FIG. 1C are the examples which have arrange | positioned the strip | belt-shaped waist circumference elastic material 42 along the edge of the back body 6 of a diaper. The belt-like waist elastic member 42 is made of an elastic foam such as urethane foam. In the illustrated example, the waist elastic member 42 is disposed only on the back body (back side), but the waist elastic material may be disposed on the front body (abdominal side).

  Moreover, in an underpants type disposable diaper, a belly circumference elastic material may be attached. An abdominal circumference elastic material is an elastic material arrange | positioned in the part (namely, part equivalent to a wearer's abdominal circumference) between a waist circumference opening part and a leg circumference opening part. By arranging the elastic material around the abdomen, it is possible to form a highly elastic tammy gather around the abdomen of the wearer.

  For these stretchable materials, after considering the degree of shrinkage of gathers, etc., the constituent material, the elongation rate of the material, the stretched state at the time of fixing, etc. may be determined.

  As an elastic material, the elastic material used by the conventional absorbent article can be used suitably. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc. in addition to natural rubber flat rubber and synthetic rubber (urethane rubber, etc.) elastic thread. it can.

  The stretchable material is preferably fixed in the stretched state in order to exert a sufficient stretch force. For example, when the elastic material is a flat rubber made of natural rubber or a thread rubber made of an elastic thread of synthetic rubber, it is preferably fixed in an extended state of 120 to 400%, and fixed in an extended state of 200 to 300%. More preferably.

  The stretchable material as described above is fixed to other constituent members of the absorbent article by an adhesive or other means. The fixing method may be, for example, adhesion using a hot melt adhesive or other highly fluid adhesive, or may be welding by heat such as heat sealing or ultrasonic waves.

[3-6] Application target:
In addition, the absorbent article of the present invention can be applied to a urine pad and a pants-type disposable diaper in addition to a tape-type disposable diaper. That is, in a urine pad or a pants-type disposable diaper, the absorbent body is 1) the absorbent body has a two-layer structure composed of a narrow absorbent body and a wide absorbent body. 2) Ears that protrude from both side edges of the narrow absorbent body are formed. 3) Similar to the tape-type disposable diaper described above, by laminating the wide absorbent body as described above, and 3) fixing the narrow absorbent body in a state where the narrow absorbent body is pressed from both side edges by the ears of the wide absorbent body The effect of can be obtained.

  The “urine pad” is also referred to as an inner pad or an auxiliary pad, and is an absorption pad mainly intended for urine absorption. This urine pad is placed on the surface of the top sheet of the disposable diaper and used together with the disposable diaper, or placed on the inner surface of the underwear and used alone. Like a disposable diaper, the urine pad includes an absorbent body, a top sheet disposed so as to cover the surface of the absorbent body, and a back sheet disposed so as to cover the back surface of the absorbent body. Generally, it is configured in a small pad shape in which the side around the waist of the person is not restrained.

  A “pants-type disposable diaper” is a pant-type configuration in which one waist opening and a pair of leg openings 12 are formed by joining corresponding side edges of the front and back bodies together. Means disposable diapers.

  Above all, an outer body presenting a pants-type body in which an absorbent body is encapsulated between the top sheet and the back sheet, a pad-shaped absorbent main body, and one waist opening and a pair of leg openings are formed. A form in which the absorbent main body 14 is disposed and fixed inside the exterior sheet is sometimes referred to as a “two-piece type”.

  The absorbent article of the present invention will be described more specifically with reference to the drawings. However, the absorbent article of the present invention encompasses all absorbent articles having the invention-specific matters, and is not limited to the following examples.

[1] Example 1:
As the absorbent article of Example 1, a tape-type disposable diaper was produced. The specific structure was the structure of the absorbent article 1A shown in FIGS. 1A to 1E. This absorbent article 1A is of M size for adults, has a length in the front-rear direction of 840 mm, a width of the back body 6 (a length between the side edges 6a and 6b) of 530 mm, and a minimum width of the crotch 4 of 330 mm. It was.

  Absorbent article 1A used absorbent body 22 having an upper and lower two-layer structure as an absorbent body. This absorber 22 includes a rectangular narrow absorber 50 (width 180 mm, length 690 mm, thickness 5 mm) and an hourglass-shaped wide absorber 52 (maximum width including ears) laminated on the surface thereof. 340 mm, crotch minimum width 230 mm, length 690 mm, thickness 5 mm). The wide absorbent body 52 is made of only fluff pulp, and the narrow absorbent body 50 is used in combination with 85 parts by mass of SAP with respect to 100 parts by mass of fluff pulp. The wide absorbent body 52 and the narrow absorbent body 50 were fixed to each other with a hot melt adhesive.

  The ears of the wide absorbent body 52 were bonded and fixed to the absorbent encapsulating sheet 54. Bonding and fixing were performed using a hot-melt adhesive, and the joining part 62A on the rear body 6 side was formed in a rectangular shape with a width of 70 mm and a length of 100 mm, and the joining part 62A on the front body side was formed in a rectangular shape with a width of 70 mm and a length of 50 mm.

[2] Example 2:
A tape-type disposable diaper was produced as the absorbent article of Example 2. The specific structure was the structure of the absorbent article 1B shown in FIGS. 2A to 2C. This absorbent article 1B was formed in the same manner as the absorbent article of Example 1 except for the shape of the joint portion 62B.

  The joining part 62B continuously formed a joining part 62B having a width of 20 mm from the back body 6 side to the front body 4 side. The length of the joining part 62B was 690 mm.

[3] Example 3:
A tape-type disposable diaper was produced as the absorbent article of Example 3. The specific structure was the structure of the absorbent article 1C shown in FIGS. 3A to 3C. This absorbent article 1C was formed in the same manner as the absorbent article of Example 1 except for the shape of the joint portion 62C.

  As the joining portion 62C, three joining portions 62A having a width of 10 mm were formed at intervals of 10 mm in the same portion as the joining portion 62A of Example 1. The length of the joining part 62C on the rear body 6 side and the length of the joining part 62C on the front body 2 side were both 100 mm.

  The absorbent article of the present invention can be used for absorbent articles such as disposable diapers and urine pads for infants or adults such as the elderly and persons with disabilities who need care.

1A, 1B, 1C: absorbent article, 2: front body, 2a, 2b: side edge, 4: crotch, 6: back body, 6a, 6b: side edge, 8: side flap, 11: fastening tape, 13: Loop material, 18: Top sheet, 18a: Center sheet, 18b: Side sheet, 20: Back sheet, 22: Absorber, 24: Cover sheet, 26, 26a, 26b: Solid gather, 36: Solid gather elastic material 40: elastic material around the leg, 42: elastic material around the waist, 46: hook material, 48: tape base material, 50: narrow absorbent body, 52: wide absorbent body, 54, 56: absorbent encapsulating sheet, 58 : SAP layer, 60: interlayer gap, 62A, 62B, 62C: junction.

Claims (6)

It is formed from each part of the front body, the crotch and the back body,
Absorber comprising fluff pulp and superabsorbent polymer, at least part of a liquid permeable material, a top sheet arranged to cover the surface of the absorber, and a liquid impermeable material, A back sheet arranged to cover the back surface of the absorber,
The top sheet and the back sheet have an interlayer gap that communicates between the absorber and the external space in a region on the front end side from the portion where the absorber is disposed and a region on the rear end side from the portion where the absorber is disposed. Pasted to form,
The absorbent body includes a narrow absorbent body disposed at a central portion in the width direction of the absorbent article, and a wide absorbent body in which at least one of a front end portion and a rear end portion is formed wider than the narrow absorbent body. Presents a laminated two-layer structure,
The wide absorbent body is laminated with the narrow absorbent body so that ears protruding from both side edges of the narrow absorbent body are formed, and the region where the narrow absorbent body is disposed is the narrow absorbent body and It has the two-layer structure consisting of the wide absorbent body,
In the region outside the both side edges of the narrow absorbent body, the ear part is attached to the sheet material to which the narrow absorbent body is fixed by the ear part of the wide absorbent body. Absorbent article that is bonded and fixed in a pressed state. The laminate of the narrow absorbent body and the wide absorbent body is integrally encapsulated by an absorbent encapsulating sheet made of a liquid permeable material,
2. The absorption according to claim 1, wherein the ear portion of the wide absorbent body is bonded and fixed to the absorbent encapsulating sheet to which the narrow absorbent body is fixed in a region outside both side edges of the narrow absorbent body. Sex goods. The ears are formed in pairs on both the front body side and the back body side of the absorbent article,
A pair of joint portions for joining and fixing the ear portions to a sheet material on which the narrow absorbent body is secured are formed on each of the front end portion and the rear end portion of the wide absorbent body. The absorbent article as described. The ears are formed in pairs on both the front body side and the back body side of the absorbent article,
Joint for joining fixing the ear portion in the sheet material the narrow absorber is fixed, any claims 1-3 of which are intermittently formed in the front and rear ends of the wide absorbent body An absorbent article according to any one of the above. The absorbent article according to any one of claims 1 to 4 , wherein the narrow absorbent body is composed of fluff pulp and a superabsorbent polymer, and the wide absorbent body is composed of fluff pulp. The absorbent article according to any one of claims 1 to 5 , wherein a superabsorbent polymer layer is interposed between the narrow absorbent body and the wide absorbent body.

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