JP6269473B2 - Disposable diapers and cushion sheets - Google Patents

Description

  The present invention relates to a disposable diaper. If it demonstrates concretely, this invention relates to the disposable diaper which can form a waist gather with high cushioning property in the waist edge part of a diaper.

  Conventionally, disposable diapers for infants and the elderly are known. There are various types of disposable diapers. For example, a pants-type disposable diaper and a tape-type disposable diaper are known (Patent Document 1, Patent Document 2, and Patent Document 3).

  The pants-type disposable diaper is a type of disposable diaper in which both front and rear body side parts are joined in advance. As a pants-type disposable diaper, the exterior body on which the absorbent main body is placed is integrated from the front body to the back body (Patent Document 1), or the exterior body is separated at the front body and the back body. A separation type (Patent Document 2) is known in which an absorbent main body is connected between a front body exterior body and a back body exterior body so as to be bridged. The tape-type disposable diaper is a type of disposable diaper in which an adhesive tape is attached to both sides of the front body or the back body, and the front body and the back body are bonded using the adhesive tape when worn (Patent Document 3). ).

  In a pants-type disposable diaper, a plurality of elastic members are generally fixed in an extended state on the periphery of a waist opening formed by bonding a front body and a back body. These elastic members tighten around the wearer's waist so that the diaper can be worn without falling down with the movement of the wearer and the weight of excrement. For this reason, the function for providing the expansion-contraction member in the periphery of a waist opening part, and preventing the diaper slipping becomes an important function.

  On the other hand, if the tightening around the waist of the diaper becomes too strong, the wearer may feel a tight feeling. In addition, when tightening is strengthened, the adhesion is improved, but the air permeability is deteriorated.

  Here, conventionally, a technique for forming a waist gather is known in order to impart an appropriate tightening force around the waist of a disposable diaper. That is, by fixing a plurality of elastic members in a stretched state between the cover sheets constituting the waist of the disposable diaper, when those elastic members contract, the cover sheets near the waist opening are covered. A habit occurs. By this wrinkle, a waist gather is formed near the waist opening. Since this waist gather can contact | abut to a wearer's skin and can improve the adhesiveness of a disposable diaper, the fit feeling around a waist improves. The waist gather also serves as a cushion for relaxing the tightening of the wearer by the elastic member.

  Furthermore, Patent Document 4 discloses a technique for providing a disposable diaper having flexibility and cushioning properties to the entire waist gather. This technology for waist gathers is also called “flute structure”. The flute structure has a pair of sheets for fixing with a waist elastic member interposed therebetween, and a sheet for forming a heel (cushion forming sheet) joined thereto by intermittent joining portions. In the flute structure, when the waist elastic member contracts, the cushion forming sheet floats at a portion that is not joined (non-joined portion). In this way, by forming an air passage (space) between the cushion forming sheet and the pair of sheets sandwiching the waist elastic member, the hardness of the pair of sheets sandwiching the waist elastic member is directly transmitted to the skin. It becomes difficult. For this reason, air permeability, a softness | flexibility, and cushioning properties can be provided to the whole waist gather by forming a flute structure.

  Patent Document 5 discloses an invention in which a plurality of cylindrical portions (ventilation passages) are formed around the stomach of a disposable diaper, and a plurality of apertures are intermittently formed in a sheet member constituting the cylindrical portion. It is disclosed. In the invention of Patent Document 5, a plurality of apertures are provided in a row along the convex portion of the sheet constituting the cylindrical portion. For this reason, the plurality of apertures are linearly arranged along the direction in which the cylindrical portion extends (longitudinal direction of the disposable diaper). Thus, by forming a plurality of openings in the cylindrical part around the stomach of the disposable diaper, it is possible to improve the breathability of the waist gather and to soften the hand.

JP 2009-254662 A JP 2010-233733 A Japanese Patent Laid-Open No. 2005-323585 JP 2011-254996 A JP 2011-078377 A

  By the way, in order to improve the air permeability and the touch of the “flute structure” disclosed in Patent Document 4, a sheet member or a plurality of depressions disclosed in Patent Document 5 are formed. It is conceivable to use a sheet member.

  However, as described above, in the invention of Patent Document 5, a plurality of apertures are linearly arranged along the longitudinal direction of the disposable diaper. Then, in the invention of this Patent Document 5, there is a non-opening portion where no opening is formed along the longitudinal direction between the rows of openings. In other words, in the invention of Patent Document 5, it can be said that when viewed in the width direction of the disposable diaper, there are alternately open portions and non-open portions. As described above, in the sheet member for forming the cylindrical portion (ventilation passage), if the hole portion and the non-hole portion are clearly distinguished, unevenness in strength (bias) occurs in the sheet member. End up. That is, the opening portion of the sheet member has a relatively low strength because a plurality of openings are formed in a row. On the other hand, the non-opening portion of the sheet member has a relatively high strength because one incision hole is not formed along the longitudinal direction. Therefore, in this invention, a weak part and a strong part exist alternately along the width direction of the disposable diaper (stretching direction of the waist elastic member). As a result, when the opening is formed as in Patent Document 5, when the waist elastic member contracts, the contraction force is not easily transmitted to the entire sheet, and the space in the tubular portion (ventilation passage) is efficiently used. There was a problem that it was difficult to swell. In particular, in the invention described in Patent Document 5, a plurality of apertures are formed only at portions along the apex (convex portion) of the cylindrical portion. As described above, when the opening is formed only at the apex of the cylindrical portion, the strength near the apex of the cylindrical portion is reduced, and thus the space in the cylindrical portion is difficult to expand.

  Furthermore, in the invention of Patent Document 5, a plurality of apertures are formed only in a portion along the apex (convex portion) of the cylindrical portion. For this reason, in the invention of Patent Document 5, no opening is formed in the vicinity of the joint portion of the sheet member at the base of the cylindrical portion. However, the vicinity of the joint portion of the sheet member is a portion that is easily stuffy when the disposable diaper is worn. For this reason, in the structure of patent document 5, there existed a problem that the suffocation produced in the junction part vicinity of a sheet | seat member could not be eliminated.

  As described above, in the “flute structure” of the disposable diaper, when a sheet member having a plurality of holes or depressions is used, the strength of the entire sheet in the width direction (stretching direction of the waist elastic member) is as much as possible. It is preferable to make it uniform. Moreover, it is preferable to ensure the air permeability in the vicinity of the joint portion of the sheet member. Therefore, an object of the present invention is to provide a technique capable of making the strength of the sheet member adopted in the “flute structure” uniform and improving the air permeability in the vicinity of the sheet joint portion.

  The inventor of the present invention, as a result of intensive studies on means for solving the conventional problems, forms a plurality of apertures or depressions in the outermost layer sheet member (cushion forming sheet) of the “flute structure”, and This row of openings or depressions was inclined at a predetermined angle with respect to the longitudinal direction of the diaper. That is, in the present invention, the plurality of apertures or depressions formed in the sheet member are not arranged on a straight line along the longitudinal direction of the diaper, but are arranged on a straight line inclined by a predetermined angle with respect to the longitudinal direction of the diaper. It will be a thing. Thereby, since a plurality of apertures or depressions are efficiently dispersed throughout the sheet member, the strength of the sheet member in the width direction of the diaper (stretching direction of the waist elastic member) can be made uniform. . In addition, since a plurality of openings or depressions are also formed in the vicinity of the joint portion of the sheet member, air permeability in the vicinity of the joint portion can be ensured. In addition, you may provide a hollow in a sheet | seat instead of an opening. Since the hole bottom of the dent is very thin, it can be expected that the air permeability of the sheet member is improved in the same manner as the opening. The inventor has conceived that the problems of the prior art can be solved based on the above knowledge, and has completed the present invention. More specifically, the present invention has the following configuration.

The 1st side of the present invention is related with a disposable diaper.
The disposable diaper of the present invention is divided in the longitudinal direction (Y direction) into a front body 1, a back body 2, and a crotch 3 positioned between the front body 1 and the back body 2. Moreover, the disposable diaper of this invention has the cushion part 40 formed in both the front body 1 and the back body 2, or any one.
The cushion portion 40 includes an inner sheet 41, an outer sheet 42, one or a plurality of waist elastic members 43, and a cushion forming sheet 44.
The outer sheet 42 is located on the skin non-facing surface side of the inner sheet 41.
The waist elastic member 43 is fixed by being sandwiched between the inner sheet 41 and the outer sheet 42 in a state of extending along the width direction (X direction) of the disposable diaper.
The cushion forming sheet 44 is overlapped with either or both of the inner sheet 41 and the outer sheet 42, and the bonding portions 51 and the non-bonding portions 52 are alternately continued in the width direction with respect to these sheets 41 and 42. So that they are joined intermittently.
The cushion forming sheet 44 is configured by a sheet member in which a plurality of openings 60 or depressions are regularly formed.
The plurality of openings 60 or depressions are grouped into those belonging to the row group (R) and those belonging to the column group (C). The row group (R) is a group formed by connecting the apertures 60 adjacent in the width direction (X direction). The column group (C) is a group formed by connecting the openings 60 or the depressions adjacent in the longitudinal direction (Y direction).
In the present invention, the connecting straight line (A) connecting the plurality of openings 60 or the recesses in the row group (C) is at a predetermined angle (θ) with respect to the reference straight line (F) extending along the longitudinal direction. It is inclined (see FIG. 6).

  As in the above configuration, in the present invention, the pattern of the opening 60 or the depression formed in the cushion forming sheet 44 is a virtual reference straight line along the longitudinal direction of the disposable diaper. The pattern is inclined at a predetermined angle (θ) with respect to F). For this reason, even if the reference straight line (F) is drawn at any position on the cushion forming sheet 44, at least one hole 60 or a depression is positioned on the reference straight line (F). Can do. Further, according to the above pattern, the plurality of apertures 60 or the depressions are efficiently dispersed along the width direction (X direction) of the cushion forming sheet 44, so that the entire strength of the cushion forming sheet 44 is made uniform. be able to. Therefore, by forming the “flute structure” using such a cushion forming sheet 44, the internal space in the air passage is easily expanded, and the cushioning property can be improved. Furthermore, according to said pattern, the opening 60 or the hollow can be formed not only in the non-joining part 52 of sheets but in the joining part 51 vicinity. Thereby, the air permeability of the cushion forming sheet 44 as a whole is improved.

  In the disposable diaper of the present invention, the predetermined angle (θ) is preferably not less than 5 degrees and not more than 45 degrees.

  If the inclination (θ) of the rows of the openings 60 is less than 5 degrees or more than 45 degrees, it is difficult to disperse the plurality of openings 60 throughout the cushion forming sheet 44. As a result, there is a possibility that the air passage of the cushion forming sheet 44 is less likely to swell or the air permeability is deteriorated. Therefore, the inclination (θ) of the row of the apertures 60 is preferably not less than 5 degrees and not more than 45 degrees.

  In the disposable diaper of the present invention, it is assumed that a virtual reference straight line (F) is drawn so as to pass through the centers of the two openings (61, 62) simultaneously. The two openings at this time are defined as a first opening 61 and a second opening 62, respectively. In this case, the distance (P) in the longitudinal direction between the first opening 61 and the second opening 62 is equal to the distance (D) in the longitudinal direction of the opening 60 included in the adjacent row group (C). Thus, it is preferably 3 times or more (see FIG. 6).

  As in the above configuration, it is preferable that the distance (P) in the longitudinal direction between the first opening 61 and the second opening 62 located on the reference straight line (F) is as far as possible. If this interval (P) is close, a large number of apertures 60 are aligned on one reference straight line (F), but in order to disperse a plurality of apertures 60 over the entire sheet, It is preferable that the openings 60 are not aligned as much as possible on the reference straight line (F). Therefore, in order to disperse the plurality of apertures 60, it is preferable that the interval (P) is as far as possible.

In the present invention, the length in the width direction (L ₁ ) between the joint portions 51 of the cushion forming sheet 44 is the width between the joint portions 51 of the inner sheet 41 or the outer sheet 42 to which the cushion forming sheet 44 is joined. It is preferably longer than the length (L ₂ ) in the direction (see FIG. 8).

  As described above, in the present invention, the length between the intermittent joining portions 51 is longer in the cushion forming sheet 44 than in the sheet members 41 and 42 that intermittently join the cushion forming sheet 44. Is preferred (see FIG. 8). Thereby, even if the waist elastic member 43 is not contracted and the inner sheet 41 and the outer sheet 42 are stretched, the cushion forming sheet 44 is slightly slackened. For this reason, for example, even if the wearer's belly is thick and the waist elastic member 43 is not sufficiently contracted, the cushion forming sheet 44 forms a heel around the waist of the disposable diaper. And can exhibit cushioning properties. Moreover, when the waist elastic member 43 contracts and the inner sheet 41 and the outer sheet 42 sandwiching the waist elastic member 43 are in a state where wrinkles are formed, a larger wrinkle is formed on the cushion forming sheet 44. Thus, since the cushion formation sheet 44 comes to form a large bag, the flexibility and cushioning properties around the waist of the diaper can be further enhanced.

The second aspect of the present invention relates to a cushion sheet.
The cushion sheet is a sheet-like member in which one or a plurality of elastic elastic members are fixed between a plurality of sheet members. When there are a plurality of elastic elastic members, the elastic elastic members are arranged in parallel.
The cushion sheet includes an inner sheet 41, an outer sheet 42, one or more elastic elastic members 43, and a cushion forming sheet 44.
One or a plurality of elastic elastic members 43 are fixed by being sandwiched between the inner sheet 41 and the outer sheet 42 in a state of extending along a certain direction (X direction).
The cushion forming sheet 44 is overlapped with either or both of the inner sheet 41 and the outer sheet 42, so that the bonding portions 51 and the non-bonding portions 52 are alternately continued in a certain direction (X direction). Are intermittently joined.
The cushion forming sheet 44 is configured by a sheet member in which a plurality of openings 60 or depressions are regularly formed.
The plurality of apertures 60 or depressions are grouped into row groups (R) and column groups (C).
The row group (R) is a group formed by connecting openings 60 or depressions adjacent in a certain direction (X direction).
The row group (C) is a group formed by connecting the openings 60 or the recesses adjacent to each other in the orthogonal direction (Y direction) orthogonal to the certain direction.
Here, the connecting straight line (A) connecting the plurality of apertures 60 or the depressions in the row group (C) is a predetermined angle (θ) with respect to the reference straight line (F) extending along the orthogonal direction (Y direction). Leaning on

  As described above, a cushion sheet having a high cushioning property can be manufactured separately from the disposable diaper.

  According to the present invention, the strength of the perforated sheet employed in the so-called “flute structure” can be made uniform, and the air permeability in the vicinity of the sheet joint can be improved.

FIG. 1 is an external perspective view of a disposable diaper according to an embodiment of the present invention. FIG. 2 is a developed plan view of a disposable diaper according to an embodiment of the present invention. 3 is a cross-sectional view taken along line YY shown in FIG. FIG. 4 conceptually shows the structure of the cushion portion. Fig.4 (a) has shown typically the component of the cushion part, and FIG.4 (b)-(d) has shown typically the cross-sectional state of the cushion part. FIG. 5 is a perspective view schematically showing the cushion portion. FIG. 6 shows an example of an opening pattern of the cushion forming sheet. FIG. 7 conceptually shows the structure of the cushion portion according to another embodiment. Fig.7 (a) has shown typically the component of the cushion part, and FIG.7 (b)-(d) has shown typically the cross-sectional state of the cushion part. FIG. 8 is an explanatory diagram for explaining the concept of the length (L ₁ ) and the length (L ₂ ). FIG. 9 shows another embodiment of the cushion portion. FIG. 10 shows another embodiment of the cushion portion. FIG. 11 shows another embodiment of the cushion portion.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but includes those appropriately modified by those skilled in the art from the following embodiments.

In the present specification, the “front body” means a portion covering the wearer's ventral side (front of the body) when a diaper is worn on the wearer. The “inseam” means a portion that covers the inseam of the wearer when the diaper is worn on the wearer. Further, the “rear body” means a portion that covers the back side (back of the body) of the wearer when the diaper is worn on the wearer.
In the present specification, the “longitudinal direction” basically means a direction (Y direction) connecting the front body and the back body of the disposable diaper. The “width direction” basically means a direction (X direction) orthogonal to the longitudinal direction of the disposable diaper.
In the present specification, “A to B” means “A or more and B or less”.

(1. Overall configuration of disposable diapers)
The present invention is widely applicable to, for example, known pants-type disposable diapers and tape-type disposable diapers. A pants-type disposable diaper is a disposable diaper of a type in which both sides of a front body and a back body are joined in advance (for example, Patent Document 1). A tape-type disposable diaper is a type of disposable diaper in which an adhesive tape is attached to both sides of the front body or the back body, and the front body and the back body are bonded using the adhesive tape when worn (for example, patents) Reference 3). In addition, the pants-type disposable diaper includes an integral type in which an exterior body is integrated from the front body to the back body (for example, Patent Document 1), or a separation in which the exterior body of the front body and the exterior body of the back body are separated. There is a type (for example, Patent Document 2). Below, among these various types of disposable diapers, the content of the present invention will be described in detail by taking the separation type of pants-type disposable diapers as an example.

  FIG. 1 is a perspective view showing an example of a disposable diaper 100 viewed from the front body side. FIG. 2 is a development view showing an example of a disposable diaper, and shows a state in which the disposable diaper is viewed from the skin facing surface side. As shown in the developed view of FIG. 2, the disposable diaper 100 includes a front body 1 that contacts the abdomen of the wearer when worn, a back body 2 that contacts the back of the wearer, and a wearer. It is divided into the crotch part 3 applied to the crotch. In the present embodiment, in the disposable diaper 100, the front body 1 is configured by the front body exterior body 10, and the back body 2 is configured by the back body exterior body 20. And the absorptive main body 30 is bridge | crosslinked by the crotch part 3 between the front body exterior body 10 and the back body exterior body 20. FIG. That is, one end of the absorbent main body 30 is fixed to the front body exterior body 10, and the other end of the absorbent main body 30 is fixed to the rear body exterior body 20.

  2 is assembled into the state shown in FIG. 1 by joining both end portions in the width direction of the front body exterior body 10 and the back body exterior body 20 from the expanded state shown in FIG. As shown in FIG. 1, the waist opening 4 is formed by the upper end edge of the front body exterior body 10 and the upper end edge of the rear body exterior body 20. Moreover, the leg opening part 5 located around a wearer's leg part at the time of mounting | wearing is formed by joining the both ends of the front body exterior body 10 and the back body exterior body 20 mutually. For this reason, the wearer can put on the disposable diaper 100 by putting both legs from the waist opening 4 and taking out each leg from the leg opening 5.

  Further, as shown in FIG. 2, in the present embodiment, the front body exterior body 10 and the rear body exterior body 20 are respectively formed with cushion portions 40. The cushion portion 40 is formed so as to extend in the width direction along the edge forming the waist opening 4. The cushion portion 40 includes a plurality of waist elastic members 43. The plurality of waist elastic members 43 extend in the width direction of the disposable diaper along the end of the front body exterior body 10 and the end of the back body exterior body 20 corresponding to the opening edge of the waist opening 4. The plurality of waist elastic members 43 are fixed in an extended state, and a waist gather is formed in the vicinity of the waist opening 4 when the plurality of waist elastic members 43 contract.

  In the present embodiment, the cushion portion 40 is provided on both the front body exterior body 10 and the back body exterior body 20. However, in this invention, the cushion part 40 should just be provided in at least any one of the front body exterior body 10 and the back body exterior body 20. FIG.

(2. Components of disposable diapers)
Next, an example of the configuration of each part of the disposable diaper 100 will be described using the drawings.

(2-1. Cushion part)
FIG. 3 is a cross-sectional view taken along line YY shown in FIG. In the sectional view of FIG. 3, various sheet members constituting the disposable diaper are drawn with a conceptual thickness, but the sheet member constituting the disposable diaper is usually very thin.

  As shown in FIG. 3, the front body exterior body 10 and the rear body exterior body 20 (hereinafter collectively referred to as “exterior bodies 10, 20”) include a cushion portion 40. The cushion part 40 is a means for forming a waist gather at the periphery of the waist opening 4 of the disposable diaper, and is composed of a plurality of sheet members and elastic members.

  As shown in the sectional view of FIG. 3, the cushion portion 40 includes an inner sheet 41 positioned on the skin facing surface side, an outer sheet 42 positioned on the skin non-facing surface side, and the inner sheet 41 and the outer sheet 42. A plurality of waist elastic members 43 fixed between the two. As shown in FIG. 3, the inner sheet 41 and the outer sheet 42 together form a longitudinal edge of the disposable diaper. That is, the inner sheet 41 and the outer sheet 42 form an edge along the waist opening 4 of the disposable diaper. In addition, as shown in the plan view of FIG. 2, the plurality of waist elastic members 43 extend in parallel along the width direction of the disposable diaper. The plurality of waist elastic members 43 are arranged at predetermined intervals in the longitudinal direction of the disposable diaper. In the example shown in FIG. 3, the inner sheet 41 and the outer sheet 42 are separated from each other, but the sheets 41 and 42 may be connected and formed integrally. That is, one sheet member may be folded back at the waist edge, the skin facing surface side portion may be the inner sheet 41, and the skin non-facing surface side portion may be the outer sheet 42.

  The plurality of waist elastic members 43 are fixed between the inner sheet 41 and the outer sheet 42 in a state of extending along the width direction. The stretch rate when the plurality of waist elastic members 43 are fixed is preferably, for example, 150 to 400%, 200 to 380%, or 250 to 360%. The “stretch rate” is a value indicating the length of the stretchable member in the stretched state when the length (original size) of the stretchable member in the non-stretched state (free state) is 100%. As described above, the stretchable waist elastic member 43 is formed between the inner sheet 41 and the outer sheet 42. Therefore, when the waist elastic member 43 contracts, the inner sheet 41 and the outer sheet 42 are wrinkled (gathered). ) Is formed.

  When the waist elastic member 43 is sandwiched and fixed between the inner sheet 41 and the outer sheet 42, for example, an adhesive is applied to the waist elastic member 43 itself, and the waist elastic member 43 to which the adhesive is applied is used as the inner sheet. What is necessary is just to insert | pinch between 41 and the outer sheet | seat 42. FIG. Further, for example, after applying an adhesive to both or one of the inner sheet 41 and the outer sheet 42, the waist elastic member 43 can be sandwiched and fixed between these sheets 41.

  Further, in the present embodiment, the cushion portion 40 includes a cushion forming sheet 44 disposed on the skin facing surface side of the inner sheet 41. The cushion forming sheet 44 is a sheet member that directly touches the skin of the wearer of the disposable diaper, and has a function of forming a gather on the skin facing surface side of the inner sheet 41. The cushion forming sheet 44 may be further disposed on the skin non-facing surface side of the outer sheet 42. Further, the cushion forming sheet 44 stacked on the inner sheet 41 and the cushion forming sheet 44 (not shown) stacked on the outer sheet 42 may be integrally connected.

  Further, as shown in FIGS. 1 and 2, the cushion forming sheet 44 is configured by a sheet member in which a plurality of apertures 60 are formed. Although not shown, the cushion forming sheet 44 may be formed with a depression instead of the opening 60. Here, the opening means a through hole formed so that the sheet member completely penetrates. On the other hand, the dent means a portion where the thickness of the sheet member is thinner than other portions, although it is not a through hole. Although the air permeability is higher when the opening 60 is formed in the cushion forming sheet 44, the air permeability is also expected to be improved by forming a recess in the cushion forming sheet 44. Below, the example of the cushion formation sheet | seat 44 in which the several opening 60 was formed is demonstrated in detail. However, in the present specification, the description of the opening 60 formed in the cushion forming sheet 44 can be read as a depression. It is also possible to form both the opening 60 and the depression in the cushion forming sheet 44.

  Here, with reference to FIG. 4, the structure in which the cushion formation sheet 44 contained in the cushion part 40 forms a ridge will be described. FIG. 4 is a schematic diagram conceptually showing various elements constituting the cushion portion 40. As shown in FIG. 4 (a), the cushion portion 40 includes an inner sheet 41, an outer sheet 42, a plurality of waist elastic members 43 fixed between these sheets 41, 42, and the inner sheet 41. And a cushion forming sheet 44 that is overlapped. Further, the cushion forming sheet 44 has a large number of openings 60 formed therein. The cushion forming sheet 44 may be overlaid on the outer sheet 42, or may be overlaid on both the inner sheet 41 and the outer sheet 42.

  As shown in FIG. 4A, the joint portion 51 between the cushion forming sheet 44 and the inner sheet 41 is intermittently formed along the width direction (X direction) of the diaper. That is, the cushion forming sheet 44 and the inner sheet 41 are joined along the width direction of the diaper so that the joining parts 51 and the non-joining parts 52 are alternately continued. In the joining portion 51, the cushion forming sheet 44 and the inner sheet 41 may be joined by a hot melt adhesive or the like, or the cushion forming sheet 44 and the inner sheet 41 may be fused by heat sealing or ultrasonic sealing. Good. As shown in FIG. 4A, the joint portion 51 is basically formed linearly along the longitudinal direction (Y direction) of the diaper. The shape of the joint portion 51 may be linear or dot-like (dot-like). Moreover, as FIG. 4 shows, the junction part 51 may be formed intermittently in the longitudinal direction (Y direction) of a diaper. In addition, as for a joining mode between the cushion forming sheet 44 and the inner sheet 41, a known joining mode can be appropriately employed with reference to Patent Document 4 (Japanese Patent Laid-Open No. 2011-254996) and the like.

  FIG. 4B is a cross-sectional view showing a state in which the outer sheet 42, the waist elastic member 43, the inner sheet 41, and the cushion forming sheet 44 are stacked in this order from the lower side (the non-skin contact surface side) of the drawing. Is shown. FIG. 4B shows a state where the waist elastic member 43 is not contracted. As shown in FIG. 4B, the waist elastic member 43 is sandwiched and fixed between the inner sheet 41 and the outer sheet 42 in an expanded state. Further, the cushion forming sheet 44 is joined to the skin facing surface side of the inner sheet 41 at the joint portion 51 formed intermittently in the width direction.

  Next, FIG.4 (c) shows a mode that the waist elastic member 43 contracted a little, and FIG.4 (d) has shown a mode that the waist elastic member 43 contracted greatly. As shown in FIGS. 4 (c) and 4 (d), wrinkles are formed on the cushion forming sheet 44 as the waist elastic member 43 contracts. That is, when the waist elastic member 43 contracts, the cushion forming sheet 44 is separated from the inner sheet 41 at the non-joint portion 52, and an air passage (space) 70 is formed between the cushion forming sheet 44 and the inner sheet 41. Is done. Such a structure is referred to as a “flute structure” in the present specification. In this way, by forming the air passage 70 between the joint portions 51 formed intermittently, the hardness of the inner sheet 41 sandwiching the waist elastic member 43 is directly transmitted to the wearer's skin. It becomes difficult. Further, by forming a “flute structure”, it is possible to impart breathability, flexibility, and cushioning properties to the entire waist gather.

  FIG. 5 is a perspective view schematically showing the structure of the cushion portion 40. As shown in FIG. 5, when the waist elastic member 43 contracts, the cushion forming sheet 44 moves away from the inner sheet 41 at the non-joint portion 52 between the adjacent joined portions 51. For this reason, an air passage (space) 70 is formed between the cushion forming sheet 44 and the inner sheet 41. The cushion forming sheet 44 is formed with a plurality of apertures 60. The opening 60 passes through the cushion forming sheet 44 and is connected to the inside of the air passage 70. For this reason, air is introduced into the air passage 70 through the opening 60 or air inside the air passage 70 is discharged to the outside. Therefore, the air permeability of the cushion forming sheet 44 is improved by forming the plurality of openings 60 in the cushion forming sheet 44. Moreover, by forming the opening 60, the touch of the cushion forming sheet 44 can be made softer.

  In addition, as shown in FIG. 5, the cushion forming sheet 44 is vertically divided into an intermittent joining region 44a and a full joining region 44b. The intermittent joining region 44a is provided at a position near the waist edge of the disposable diaper (upper side in FIG. 5), and the entire joining region 44b is provided at a position near the crotch 3 of the disposable diaper (lower side in FIG. 5). It has been. As shown in FIG. 5, in the intermittent joining region 44a, as described above, the cushion forming sheet 44 is joined to the inner sheet 41 by the plurality of joining portions 51 provided intermittently in the width direction. Yes. For this reason, in the intermittent joining area | region 44a, when the waist elastic member 43 shrink | contracts, the "flute structure" mentioned above is formed. On the other hand, the cushion forming sheet 44 is entirely bonded to the inner sheet 41 by an adhesive 53 or the like in the entire bonding region 44b. That is, even when the waist elastic member 43 contracts, the cushion forming sheet 44 does not separate from the inner sheet 41 in the entire joining region 44b. For this reason, the air passage (space) 70 is not formed between the cushion forming sheet 44 and the inner sheet 41 in the entire joining region 44b.

  As described above, by providing the entire bonding region 44b below the cushion forming sheet 44, the cushion forming sheet 44 is firmly fixed to the inner sheet 41 and is not easily peeled off. That is, the lower end side of the cushion forming sheet 44 is a portion that is relatively easily peeled off because it frequently rubs against the skin of the wearer of the diaper. For this reason, if the intermittent joint part 51 is formed up to the lower end side of the cushion forming sheet 44, the cushion forming sheet 44 may be peeled off, which may cause discomfort to the wearer or cause urine leakage. . Therefore, in order to prevent such a situation, it is preferable to apply the adhesive 53 or the like to the entire area below the cushion forming sheet 44 and firmly fix it to the inner sheet 41. However, if the entire joining region 44 b is provided below the cushion forming sheet 44, the lower part of the “flute structure” air passage 70 is blocked, and air may not easily enter and exit the air passage 70. is there. Therefore, even in the case where the lower portion of the air passage 70 is blocked as described above, in order to keep air permeability by allowing air to enter and exit the air passage 70, the cushion forming sheet 44 is provided with a plurality of pieces in the present invention. The opening 60 is formed. By forming the plurality of apertures 60 in the cushion forming sheet 44, even if the entire bonding region 44b is provided below the cushion forming sheet 44, the air permeability of the cushion forming sheet 44 can be maintained. .

  In addition, as the waist elastic member 43, it is preferable to apply thread-like elastic rubber or belt-like elastic rubber. As such a rubber material, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, or polyester can be used.

  Moreover, in this embodiment, as FIG. 3 shows, the inner side sheet | seat 41 is extended in the direction of the crotch part 3 of a diaper. And a part of inner sheet | seat 41 has overlapped on the edge part of the longitudinal direction of the absorptive main body 30 (skin opposing surface). As described above, by superposing a part of the inner sheet 41 on the absorbent main body 30, the absorbent main body 30 is firmly fixed to the exterior bodies 10 and 20 and is difficult to come off.

  The exterior bodies 10 and 20 may further include an inner sheet 45 and a tammy stretchable member 46. That is, as shown in FIG. 3, in this embodiment, the outer sheet 42 extends in the direction of the crotch part 3, and a part of the outer sheet 42 is located on the skin non-facing surface side of the absorbent main body 30. Yes. Here, the inner sheet 45 is disposed on the skin facing surface side of the extended portion of the outer sheet 42. One or a plurality of tammy expansion / contraction members 46 are sandwiched and fixed between the extended portion of the outer sheet 42 and the inner sheet 45. Similar to the waist elastic member 43, the tammy elastic member 46 is fixed between the extending portion of the outer sheet 42 and the inner sheet 45 in an extended state along the width direction of the diaper.

(2-1-1. Opening pattern of cushion forming sheet)
Then, with reference to FIG. 6, the preferable pattern of the opening 60 of the cushion formation sheet 44 is demonstrated. FIG. 6A shows an example of the pattern of the opening 60, and FIG. 6B shows an enlarged view inside the dotted line frame shown in FIG. 6A. In the example shown in FIG. 6, the shape of the opening 60 is a perfect circle. However, the shape of the opening 60 may be an ellipse, a triangle, a quadrangle, a pentagon, a hexagon, or other polygons.

  As shown in FIG. 6B, the plurality of apertures 60 are formed in the cushion forming sheet 44 in a regular pattern. First, the plurality of apertures 60 can be grouped into row groups (R) and column groups (C). The row group (R) is a group formed by connecting adjacent apertures 60 in the diaper width direction (X direction). That is, the row group (R) is a group of apertures 60 that are formed when the closest apertures 60 are connected to the left and right in the width direction (X direction). On the other hand, the row group (C) is a group formed by connecting the openings 60 adjacent in the longitudinal direction (Y direction) of the diaper. That is, the row group (C) is a group of the apertures 60 that are formed when the closest apertures 60 are connected vertically in the longitudinal direction (Y direction). There are a plurality of row groups (R) and column groups (C), respectively. The row group (R) and the column group (C) are each linear. One opening 60 belongs to one of a plurality of row groups (R) and one of a plurality of column groups (C).

  In the example shown in FIG. 6B, the plurality of row groups (R) all extend in parallel along the width direction (X direction) of the disposable diaper. That is, when a plurality of apertures 60 belonging to one row group (R) are connected by a virtual connecting line (B), the connecting line (B) extends in parallel along the width direction (X direction). It becomes. Thus, it is preferable that all the rows (R) of the openings 60 are parallel to the diaper width direction (X direction).

  On the other hand, in the present invention, the plurality of column groups (C) are all inclined at a predetermined angle (θ) with respect to the longitudinal direction (Y direction) of the disposable diaper. More specifically, a virtual connecting straight line (A) connecting a plurality of apertures 60 belonging to one row group (C) is drawn. In addition, a virtual reference straight line (F) is drawn parallel to the longitudinal direction (Y direction) of the disposable diaper. At this time, an angle (acute angle) formed by the connecting straight line (A) and the reference straight line (F) is an inclination angle (θ) of the row group (C) of the openings 60. Thus, one of the features of the present invention is that the row (C) of the apertures 60 is inclined at a predetermined angle (θ).

  The inclination angle (θ) of the row group (C) is preferably, for example, 5 to 45 degrees. Further, it is preferable that the inclination angle (θ) is less than 45 degrees, that is, not 45 degrees. For example, the inclination angle (θ) is particularly preferably 10 to 43 degrees, 15 to 40 degrees, or 20 to 35 degrees.

  In this manner, by tilting the row (C) of the apertures 60, it is possible to eliminate a region where no aperture 60 exists in the longitudinal direction (Y direction) of the disposable diaper. That is, as shown in FIG. 6, when a virtual reference line (F) is drawn parallel to the longitudinal direction (Y direction) of the disposable diaper, at least one opening 60 is formed on the reference line (F). Is located (may be other than the center). Thereby, the cushion forming sheet 44 in which such an opening pattern is formed has a substantially uniform strength in the width direction (X direction) of the diaper. As a result, when the waist elastic member 43 contracts along the width direction (X direction) of the diaper, the contraction force is uniformly transmitted to the entire cushion forming sheet 44, and the space formed by the cushion forming sheet 44 is efficient. To swell. In addition, as in the pattern shown in FIG. 6, at least a part of the opening 60 is positioned on a certain reference straight line (F), thereby improving the air permeability of the cushion forming sheet 44. can do.

A preferable pattern of the apertures 60 will be described in more detail.
As shown in FIG. 6, the intervals (W) between the openings 60 adjacent in the width direction (Y direction) of the diaper are all equal. The interval (W) in the width direction of the opening 60 is preferably smaller than the interval (S) in the width direction of the joint portion 51 (see FIG. 4), for example (W <S). For example, the interval (W) between the openings 60 may be 10 to 95%, or 20 to 90, particularly 50 to 85%, or 60, where the interval (S) between the joints 51 is 100%. It is preferable that it is -80%. If a specific numerical value is shown, it is preferable that the space | interval (S) (refer FIG. 4) of the junction part 51 is 5-20 mm, 6-18 mm, or 7-16 mm. Moreover, it is preferable that the space | interval (W) of the width direction of the opening 60 is 3-16 mm, or 4-14 mm. By setting the interval (W) between the openings 60 in such a range, when the ventilation path 70 is formed by the cushion forming sheet 44, at least one opening 60 is formed on the ventilation path 70. Will come to be.

Further, as shown in FIG. 6, the interval in the width direction between the opening 60 belonging to a certain row group (R) and the opening 60 belonging to the adjacent row group (R) is represented by reference symbols W ₁ and W _2. It is shown in The sum of the interval (W ₁ ) and the interval (W ₂ ) is equal to the interval (W). At this time, the interval (W ₁ ) and the interval (W ₂ ) are preferably different values (W ₁ ≠ W ₂ ). In FIG. 6, the shorter interval is indicated by a symbol W ₁ and the longer interval is indicated by a symbol W ₂ (W ₁ <W ₂ ). The shorter interval (W ₁ ) is the interval in the width direction between adjacent apertures 60 in the same row group (C). The long-direction interval (W ₂ ) is an interval in the width direction of the apertures 60 belonging to different adjacent column groups (C). Here, when the interval (W ₁ ) and the interval (W ₂ ) are the same value (W ₁ = W ₂ ), there is no region where there is no opening 60 in the longitudinal direction (Y direction) of the disposable diaper. May be formed. Such a situation should be avoided. Therefore, in the present invention, it is preferable that the interval (W ₁ ) and the interval (W ₂ ) are different from each other (W ₁ ≠ W ₂ , that is, W ₁ <W ₂ ). For example, the shorter interval (W ₁ ) is preferably 10 to 95%, or 20% to 90%, particularly 50% to 85%, or 60 with respect to the longer interval (W ₂ ). % To 80% is preferable. Such a condition _(W 1 _{<W 2)} is satisfied, and becomes connect the nearest three apertures 60 by a line triangle (T) is not a regular triangle and an isosceles triangle. That is, in the present invention, the triangle (T) is preferably other than a regular triangle and an isosceles triangle. This is because if the triangle (T) is an equilateral triangle or an isosceles triangle, a region where no aperture 60 is present may be formed in the longitudinal direction (Y direction).

In FIG. 6, the distance in the longitudinal direction (Y direction) of the apertures 60 belonging to the adjacent row group (C) is indicated by the symbol D. The interval (D) in the longitudinal direction of the openings 60 can be arbitrarily set within a range that satisfies the above-described conditions (conditions such as θ, W, W ₁ , W ₂ ). In the pattern shown in FIG. 6, the intervals (D) in the longitudinal direction (Y direction) of the openings 60 are all equal. Further, for example, the interval (D) in the longitudinal direction of the openings 60 is preferably 70 to 130% or 80 to 120% with respect to the interval (W) in the width direction of the openings 60. By making the interval (D) in the longitudinal direction of the apertures 60 substantially equal to the interval (W) in the width direction of the apertures 60, the pattern of the apertures 60 is balanced as shown in FIG. It has a beautiful pattern and looks better.

  In FIG. 6, when one reference line (F) is drawn parallel to the longitudinal direction (Y direction) of the diaper, two openings whose centers are located on the reference line (F) are respectively Reference numerals 61 and 62 denote these. In other words, in the pattern shown in FIG. 6, the center of the first opening 61 and the center of the second opening 62 are positioned on one reference line (F). In FIG. 6, the first opening 61 and the second opening 62 are shown in black for convenience. In FIG. 6, the distance in the longitudinal direction (Y direction) between the first opening 61 and the second opening 62 is indicated by the symbol P. The distance (P) between the first opening 61 and the second opening 62 is longer than the distance (D) in the longitudinal direction of the opening 60 (D <P). For example, the interval (P) is preferably at least 3 times the interval (D), particularly preferably at least 4 times, or at least 5 times. In the example shown in FIG. 6, the interval (P) is set to 5 times the interval (D).

  Thus, it is preferable that the distance (P) in the longitudinal direction between the first opening 61 and the second opening 62 located on a certain reference straight line (F) is as far as possible. If the distance (P) is close, a large number of apertures 60 may be aligned on one reference straight line (F). When a large number (for example, three or more) of apertures 60 are aligned on one reference straight line (F), the plurality of apertures 60 are difficult to be dispersed throughout the sheet. If it does so, the nonuniformity (bias) will arise in the intensity | strength of the width direction of the cushion formation sheet 44, and a part with good air permeability and a bad part will come to be distinguished clearly. Therefore, in order to make the strength and air permeability of the cushion forming sheet 44 uniform, it is preferable to disperse the plurality of apertures 60 over the entire sheet as much as possible. For that purpose, it is on one reference straight line (F). , It is preferable to prevent the openings 60 from being aligned as much as possible. Therefore, in order to disperse the plurality of apertures 60, it is preferable that the interval (P) is as far as possible. A form in which there is no center of another hole 60 on one reference straight line (F) passing through the center of a certain hole 60 is also a preferred form of the present invention.

  Further, in FIG. 6, the diameter of the opening 60 is indicated by the symbol φ. For example, the diameter (φ) of the opening 60 is preferably 5% to 50%, 7% to 40, or 10 to 30% with respect to the interval (W) in the width direction of the opening 60. Specifically, the diameter (φ) of the opening 60 is preferably 0.5 mm or more, and is 0.5 to 3.0 mm, 0.8 mm to 2.0 mm, or 1.0 mm to 1.5 mm. It is particularly preferred.

  A preferable pattern as shown in FIG. 6 can be formed by determining the pattern of the openings 60 based on the various conditions described above. The pattern of the opening 60 shown in FIG. 6 can prevent unevenness (bias) from occurring in the strength in the width direction of the cushion forming sheet 44. For this reason, the cushion forming sheet 44 in which such a pattern is formed can form a ventilation path 70 with good cushioning properties because the space effectively swells when the waist elastic member 43 contracts. Moreover, the cushion forming sheet 44 on which such a pattern is formed has excellent air permeability as a whole. In particular, the cushion forming sheet 44 exhibits preferable air permeability even in the vicinity of the joint portion 51.

  In addition, it is preferable that the inner sheet 41, the outer sheet 42, and the cushion forming sheet 44 are each formed of a material such as a non-woven fabric having a good touch and air permeability. For example, as a nonwoven fabric, what was manufactured by the spun bond method, the air through method, and the airlaid method, for example may be used. The cushion forming sheet 44 may be formed with the above-described pattern of openings using a known punching type opening device.

(2-1-2. Cushion forming sheet length change)
Subsequently, with reference to FIG. 7 and FIG. 8, a more preferable form of the cushion forming sheet 44 will be described. FIG. 7 is a schematic diagram conceptually showing various elements constituting the cushion portion 40, similarly to FIG. As shown in FIG. 7A, the cushion portion 40 includes an inner sheet 41, an outer sheet 42, a plurality of waist elastic members 43, and a cushion forming sheet 44. In FIG. 7A, a plurality of apertures 60 formed in the cushion forming sheet 44 are omitted in order to avoid complication of the drawing. As a matter of course, a plurality of apertures 60 can be formed in the cushion forming sheet 44 according to the pattern described above. However, the invention shown in FIGS. 7 and 8 can also be used as an invention in which the opening 60 is not formed in the cushion forming sheet 44.

  FIG. 7B is a cross-sectional view showing a state in which the outer sheet 42, the waist elastic member 43, the inner sheet 41, and the cushion forming sheet 44 are stacked in this order from the lower side (skin non-contact surface side) of the drawing. Is shown. FIG. 7B shows a state where the waist elastic member 43 is not contracted at all. As shown in FIG. 7B, the waist elastic member 43 is sandwiched and fixed between the inner sheet 41 and the outer sheet 42 in an expanded state. Further, the cushion forming sheet 44 is joined to the skin facing surface side of the inner sheet 41 at the joint portion 51 formed intermittently in the width direction. Here, as shown in FIG. 7B, the inner sheet 41 and the outer sheet 42 are in a tensioned state with no slack in the width direction in accordance with the extended state of the waist elastic member 43. In contrast, the cushion forming sheet 44 is slightly slackened in the width direction even when the waist elastic member 43 is extended. As described above, the present invention is characterized in that the cushion forming sheet 44 is intermittently joined to the inner sheet 41 in a slack state.

  As shown in FIG. 7B, in the present invention, the waist elastic member 43 is not contracted, and the inner sheet 41 and the outer sheet 42 are in a tensioned state with no slack in the width direction. However, the cushion forming sheet 44 is slightly slackened in the width direction. For this reason, even if the waist elastic member 43 is fully extended, a space 70 is generated between the cushion forming sheet 44 and the inner sheet 41, and the cushion forming sheet 44 is slightly lifted.

  The difference between the structure of the cushion portion 40 of the present invention shown in FIG. 7B and the structure shown in FIG. 4B is obvious. In the structure shown in FIG. 4B, when the waist elastic member 43 is in the extended state, the inner sheet 41, the outer sheet 42, and the cushion forming sheet 44 are each stretched without slack in the width direction. It is in the state. For this reason, in the state where the waist elastic member 43 is extended, the ridges are not formed on the cushion forming sheet 44. For this reason, for example, when a thick wearer around the abdomen wears a disposable diaper, the waist stretchable member 43 does not contract, so that no crease is formed on the cushion forming sheet 44. In contrast, in the structure of the cushion portion 40 shown in FIG. 7B, the cushion forming sheet 44 is lifted from the inner sheet 41 even when the waist elastic member 43 is extended. And forming a cocoon. For this reason, for example, even when a thick wearer around the abdomen wears a disposable diaper and the contraction of the waist elastic member 43 is small, wrinkles are formed by the cushion forming sheet 44. Therefore, even if the waist elastic member 43 is not contracted, the flexibility and cushioning properties around the waist of the diaper can be sufficiently exhibited.

  Next, FIG.7 (c) shows a mode that the waist elastic member 43 contracted somewhat, and FIG.7 (d) has shown a mode that the waist elastic member 43 fully contracted. As shown in FIGS. 7C and 7D, it can be seen that the wrinkles formed by the cushion forming sheet 44 increase as the waist elastic member 43 contracts. Such a phenomenon is obvious when FIGS. 7C and 7D are compared with FIGS. 4C and 4D. That is, as shown in FIG. 7, in the state where the waist elastic member 43 is contracted, the cushion forming sheet 44 of FIG. 7 can form a clearly larger crease compared to the cushion forming sheet of FIG. For this reason, if the cushion formation sheet | seat 44 of FIG. 7 is employ | adopted, the waist gathers formed around the waist of a diaper will further increase the softness | flexibility, and also will become the air permeability.

Here, FIG. 8 is an explanatory diagram for comparing the lengths of the cushion forming sheet 44 and the inner sheet 41 to which the cushion forming sheet 44 is joined. That is, as described above, when the waist elastic member 43 is in the extended state, the inner sheet 41 is not slackened, and only the cushion forming sheet 44 is slackened. The sheet 44 needs to be longer than the inner sheet 41. As shown in FIG. 8, the cushion forming sheet 44 and the inner sheet 41 are cut out between two joint portions 51 adjacent in the width direction of the diaper. Then, the cut cushion forming sheet 44 and the inner sheet 41 are stretched and arranged so as not to be slack. At this time, the length of the cushion forming sheet 44 between the two joining portions 51 is set to “L ₁ ”. Further, the length of the inner sheet 41 between the two joining portions 51 is “L ₂ ”. As shown in FIG. 8, comparing the length (L ₁ ) and the length (L ₂ ), it can be seen that the length (L ₁ ) is longer. In this manner, the cushion forming sheet 44 and the inner sheet 41 are cut out between the two joint portions 51 adjacent in the width direction of the diaper, and the lengths are compared. At this time, by making the length of the cushion forming sheet 44 longer, the cushion forming sheet 44 can form a ridge even when the waist elastic member 43 is not contracted.

Here, when the length (L ₂ ) of the inner sheet 41 is 100%, the length (L ₁ ) of the cushion forming sheet 44 is preferably 103 to 300%. Further, the length (L ₁ ) of the cushion forming sheet 44 may be 110 to 3290%, 120 to 280%, or 150 to 250% with respect to the length (L ₂ ) of the inner sheet 41. There may be. Thus, by setting the length (L ₁ ) to at least 103% of the length (L ₂ ), even if the waist elastic member 43 is not sufficiently contracted, the cushion forming sheet 44 Can develop wrinkles. On the other hand, when the length (L ₁ ) exceeds 300% of the length (L ₂ ), the cushion forming sheet 44 is greatly bent, and the comfort of the diaper is worsened. For this reason, in the present invention, the length (L ₁ ) is particularly preferably not less than 103% and not more than 300% of the length (L ₂ ).

(2-2. Embodiment of cushion part)
Then, with reference to FIGS. 9-11, other embodiment of the cushion part 40 in the disposable diaper 100 of this invention is described. The following embodiment will be basically described focusing on differences from the embodiment shown in FIG. 3 described above.

  In the embodiment shown in FIG. 9A, the cushion portion 40 includes a cushion forming sheet 44 </ b> A that is intermittently bonded to the inner sheet 41 and a cushion forming sheet 44 </ b> B that is intermittently bonded to the outer sheet 42. Yes. That is, the inner cushion forming sheet 44 </ b> A is joined to the skin facing surface of the inner sheet 41. Further, the outer cushion forming sheet 44B is joined to the skin non-facing surface of the outer sheet 42. Thus, in this invention, cushion formation sheet | seat 44A, 44B may be arrange | positioned both inside and outside.

  In the embodiment shown in FIG. 9B, the inner cushion forming sheet 44A and the outer cushion forming sheet 44B are configured by a single sheet member. That is, one sheet member is folded at the longitudinal edge of the disposable diaper, the portion located inside the folding line is the inner cushion forming sheet 44A, and the portion located outside the folding line is The outer cushion forming sheet 44B is used. Thus, in the present invention, the inner cushion forming sheet 44A and the outer cushion forming sheet 44B can be configured by a single sheet member.

  In the embodiment shown in FIG. 10A, the inner sheet 41 and the outer sheet 42 are constituted by a single sheet member. That is, one sheet member is folded at the longitudinal end edge of the disposable diaper, and a plurality of waist elastic members 43 are sandwiched therebetween and fixed. A portion located inside the folding line is referred to as an inner sheet 41, and a portion located outside the folding line is referred to as an outer sheet 42. Thus, in the present invention, the inner sheet 41 and the outer sheet 42 can be configured by a single sheet member.

  In the embodiment shown in FIG. 10B, the inner sheet 41 and the outer sheet 42 are constituted by a single sheet member, and the inner cushion forming sheet 44A and the outer cushion forming sheet formed by separate sheet members. 44B is provided. That is, the inner cushion forming sheet 44A is bonded to the skin facing surface of the inner sheet 41, and the outer cushion forming sheet 44B is bonded to the skin non-facing surface of the outer sheet 42. As described above, in the present invention, the inner sheet 41 and the outer sheet 42 can be formed of a single sheet member, and both the inner cushion forming sheet 44A and the outer cushion forming sheet 44B can be provided.

  In the embodiment shown in FIG. 11A, the inner sheet 41 and the outer sheet 42 are configured by a single sheet member, and the inner cushion forming sheet 44A and the outer cushion formed sheet 44B are configured by a single sheet member. It is composed. That is, one sheet member is folded at the longitudinal edge of the disposable diaper, the portion located inside the folding line is the inner cushion forming sheet 44A, and the portion located outside the folding line is The outer cushion forming sheet 44B is used. As described above, in the present invention, the inner sheet 41 and the outer sheet 42 are configured by a single sheet member, and the inner cushion forming sheet 44A and the outer cushion formed sheet 44B are configured by a single sheet member. You can also.

  In the embodiment shown in FIG. 11 (b), the outermost layer sheet 47 is bonded to the skin non-facing surface side of the outer sheet 42. Unlike the outer cushion forming sheet 44B described above, the outermost layer sheet 47 is not bonded intermittently to the outer sheet 42, but is bonded to the entire surface by, for example, a hot melt adhesive. . The outermost layer sheet 47 is a sheet member for reinforcing the outer sheet 42 and improving its feel. Thus, the outermost layer sheet 47 can be bonded to the skin non-facing surface of the outer sheet 42.

(2-3. Absorbent body)
As shown in FIG. 2 and FIG. 3, the absorbent main body 30 is held in a state of being bridged between the front body exterior body 10 and the back body exterior body 20, and is worn by the wearer when the disposable diaper 100 is worn. It is located in the lower crotch and absorbs and retains urine and other liquids excreted by the wearer. The absorbent main body 30 is arranged over the front body 1 and the back body 2 with the crotch part 3 of the disposable diaper as the center. As shown in FIGS. 2 and 3, the absorbent main body 30 includes an absorbent body 31, a top sheet 32, a back sheet 33, a cover sheet 34, and a pair of three-dimensional gathers 35.

  The absorber 31 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 31 is disposed between a liquid-permeable top sheet 32 and a liquid-impermeable back sheet 33. The absorber 31 has a function of absorbing the liquid that has passed through the top sheet 32 and is made of an absorbent material. As the absorbent material constituting the absorber 31, a known material can be adopted. As an absorptive material, it is good also as using a flap pulp, a superabsorbent polymer, or a hydrophilic sheet, for example. The absorbent body 31 is preferably encapsulated by the core wrap sheet 36. As the core wrap sheet 36, tissue paper, absorbent paper, a non-woven fabric subjected to hydrophilic treatment, or the like can be used as appropriate.

  The top sheet 32 is a member that is in direct contact with the skin of the wearer's crotch and allows liquid such as urine to pass through the absorber 31. For this reason, the top sheet 32 is made of a liquid-permeable material having high flexibility. Further, the top sheet 32 is disposed so as to cover the skin contact surface side of the absorber 31. Examples of the liquid permeable material constituting the top sheet 32 are a woven fabric, a nonwoven fabric, or a porous film. Further, as the top sheet 32, for example, a fiber made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and subjected to a hydrophilization treatment and further made into a non-woven fabric may be used.

  The back sheet 33 is a member for preventing the liquid that has passed through the top sheet 32 and absorbed by the absorber 31 from leaking to the outside of the diaper. For this reason, the back sheet 33 is made of a liquid-impermeable material. The back sheet 33 covers the absorbent body 31 from the non-skin contact surface side in order to prevent liquid leakage from the bottom surface of the absorbent body 31. An example of the impermeable material constituting the back sheet 33 is a liquid impermeable film made of polyethylene resin. In particular, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed.

  The cover sheet 34 is a member for reinforcing the back sheet 33 and improving its feel. The cover sheet 34 is bonded to the skin non-contact surface side of the back sheet 33. As the material constituting the cover sheet 34, a woven fabric or a non-woven fabric is used. In particular, it is preferable to use a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester as a material constituting the cover sheet 34.

  The pair of three-dimensional gathers 35 is a member that stands along both side edges of the absorber 31 and prevents side leakage of urine excreted by the wearer. Each of the three-dimensional gathers 35 is provided with a three-dimensional gather stretchable material at the tip thereof, and rises toward the wearer's skin contact direction when the stretchable material contracts. For this reason, the pair of three-dimensional gathers 35 serves as a urine leak-proof wall, and urine that has not permeated through the top sheet 32 or urine that has not been absorbed by the absorber 31 can be obtained from the openings around the legs of the disposable diaper. Prevent leaking side leaks. The three-dimensional gather 35 can employ a known configuration used in conventional disposable diapers. The three-dimensional gather 35 can be formed, for example, by sandwiching and fixing a stretched three-dimensional gather elastic material between the layers of the water-repellent sheet. As the water-repellent sheet, for example, a non-woven sheet obtained by a method such as card embossing or spunbonding can be used, and it is particularly preferable to use a non-woven sheet such as SMS or SMMS having high waterproofness.

  As mentioned above, in this specification, in order to express the content of this invention, embodiment of this invention was described, referring drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

  For example, in the present invention, the cushion sheet as shown in FIG. 4 or FIG. 7 may be manufactured separately from the disposable diaper, and the cushion sheet may be provided by bonding the cushion sheet around the waist of the disposable diaper. it can.

  That is, as shown in FIG. 4A, the cushion sheet is a sheet-like member in which one or a plurality of elastic elastic members are fixed in parallel between a plurality of sheet members. The cushion sheet includes an inner sheet 41, an outer sheet 42, one or more elastic elastic members 43, and a cushion forming sheet 44. One or a plurality of elastic elastic members 43 are fixed by being sandwiched between the inner sheet 41 and the outer sheet 42 in a state of extending along a certain direction (X direction). The cushion forming sheet 44 is overlapped with either or both of the inner sheet 41 and the outer sheet 42, so that the bonding portions 51 and the non-bonding portions 52 are alternately continued in a certain direction (X direction). Are intermittently joined. The cushion forming sheet 44 is configured by a sheet member in which a plurality of openings 60 or depressions are regularly formed. The plurality of apertures 60 or depressions are grouped into row groups (R) and column groups (C). The row group (R) is a group formed by connecting openings 60 or depressions adjacent in a certain direction (X direction). The row group (C) is a group formed by connecting the openings 60 or the recesses adjacent to each other in the orthogonal direction (Y direction) orthogonal to the certain direction. Here, the connecting straight line (A) connecting the plurality of apertures 60 or the depressions in the row group (C) is a predetermined angle (θ) with respect to the reference straight line (F) extending along the orthogonal direction (Y direction). It is inclined at. The predetermined angle (θ) is preferably 5 degrees to 45 degrees.

Further, as shown in FIGS. 7 and 8, the length (L ₁ ) in the fixed direction between the joint portions 51 of the cushion forming sheet 44 is the inner sheet 41 or the outer sheet to which the cushion forming sheet 44 is joined. It is preferable that it is longer than the length (L ₂ ) in a certain direction between the 42 joint portions 51. In this case, the cushion forming sheet 44 is preferably formed with the plurality of openings 60 or depressions described above. However, in the form shown in FIGS. 7 and 8, the opening 60 or the recess may not be formed in the cushion forming sheet 44.

  As described above, a cushion sheet can be easily provided to an existing disposable diaper by producing a cushion sheet separately from the disposable diaper. For this reason, manufacturing only a cushion sheet is also a preferred embodiment of the present invention.

  The present invention can be suitably used in the manufacturing industry of disposable diapers.

DESCRIPTION OF SYMBOLS 1 ... Front body 2 ... Back body 3 ... Crotch part 4 ... Waist opening part 5 ... Leg opening part 10 ... Front body exterior body 20 ... Rear body exterior body 30 ... Absorbent main body 31 ... Absorber body 32 ... Top sheet 33 ... Back Sheet 34 ... Cover sheet 35 ... Solid gather 36 ... Core wrap sheet 40 ... Cushion part 41 ... Inner sheet 42 ... Outer sheet 43 ... Waist elastic member 44 ... Cushion forming sheet 44a ... Intermittent joining region 44a ... Fully joining region 45 ... Inner sheet 46 ... Tammy expansion and contraction member 47 ... Outermost layer sheet 51 ... Joining part 52 ... Non-joining part 60 ... Opening 61 ... First opening 62 ... Second opening 70 ... Airflow path (space)

Claims (4)

In the longitudinal direction (Y direction), it is divided into a front body (1), a back body (2), and a crotch part (3) located between the front body (1) and the back body (2),
A disposable diaper in which a cushion part (40) is formed on both or one of the front body (1) and the back body (2),
The cushion part (40)
An inner sheet (41);
An outer sheet (42) located on the skin non-facing surface side of the inner sheet (41);
One or a plurality of waist stretchable members (43) fixed between the inner sheet (41) and the outer sheet (42) in a state of extending along the width direction (X direction) of the disposable diaper. When,
The inner sheet (41) and the outer sheet (42) are overlapped on one or both of the inner sheets (41) and intermittently so that the joining portions (51) and the non-joining portions (52) are alternately continued in the width direction. Joined cushion forming sheet (44),
The cushion forming sheet (44)
A plurality of openings (60) or depressions are formed by regularly formed sheet members;
The plurality of apertures (60) or depressions are
A row group (R) formed by connecting openings (60) or depressions adjacent in the width direction in parallel along the width direction ;
Among the openings (60) or depressions having the shortest distance in the longitudinal direction from a certain opening, the row group (C) formed by connecting the openings (60) or those having the closest linear distance between the depressions , Grouped,
A connecting straight line (A) connecting a plurality of openings (60) or depressions in the row group (C) is inclined at a predetermined angle (θ) with respect to a reference straight line (F) extending along the longitudinal direction. And
When the reference straight line (F) is drawn so as to pass through the center of two or more openings (60) or depressions, the first opening (61) or depression adjacent to the reference straight line (F) The interval (P) between the two apertures (62) or the recesses is more than three times the adjacent interval (D) between the adjacent apertures (60) or the recesses included in the row group (C). A disposable diaper. The disposable diaper according to claim 1, wherein the predetermined angle (θ) is not less than 5 degrees and not more than 45 degrees. The length (L ₁ ) in the width direction between the joint portions (51) of the cushion forming sheet (44) is the inner sheet (41) or the outer sheet to which the cushion forming sheet (44) is joined. (42) wherein the width direction of the length (L ₂₎ long claim 1 or the disposable diaper of claim 2 than between the joint (51) of. A cushion seat in which one or more elastic elastic members are fixed between a plurality of seat members,
An inner sheet (41);
An outer sheet (42);
One or a plurality of elastic stretch members (43) fixed in a sandwiched manner between the inner sheet (41) and the outer sheet (42) in a state of extending along a certain direction (X direction);
The inner sheet (41) and the outer sheet (42) are overlapped on one or both of the inner sheets (41) and intermittently so that the joining portions (51) and the non-joining portions (52) are alternately continued in the predetermined direction. Joined cushion forming sheet (44),
The cushion forming sheet (44)
A plurality of openings (60) or depressions are formed by regularly formed sheet members;
The plurality of apertures (60) or depressions are
A row group (R) formed by connecting openings (60) or depressions adjacent in the certain direction in parallel along the width direction ;
Among the openings (60) or depressions having the shortest distance in the orthogonal direction (Y direction) perpendicular to the certain direction from a certain opening, the ones having the closest linear distance between the openings (60) or the depressions are connected. Grouped into possible column groups (C),
A connecting straight line (A) connecting a plurality of openings (60) or depressions in the row group (C) is inclined at a predetermined angle (θ) with respect to a reference straight line (F) extending along the orthogonal direction. And
When the reference straight line (F) is drawn so as to pass through the center of two or more openings (60) or depressions, the first opening (61) or depression adjacent to the reference straight line (F) The interval (P) between the two apertures (62) or the recesses is more than three times the adjacent interval (D) between the adjacent apertures (60) or the recesses included in the row group (C). A cushion sheet.

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