JP2019170552A - Stretchable structure for disposable wearing article and pants-type disposable wearing article with such stretchable structure - Google Patents

Abstract

To make it possible to improve breathability while maintaining good appearance of pleats.SOLUTION: A stretchable structure for a disposable wearing article has a plurality of elongated elastic members 19 extending in a stretch direction ED between an outer nonwoven fabric layer 12S and an inner nonwoven fabric layer 12H. The outer nonwoven fabric layer 12S is a porous nonwoven fabric in which pores 14 extending therethrough in the thickness direction are arranged. Sheet joining parts 70 are formed at intervals at least in the stretch direction ED. The pores 14 are arranged such that first pore columns 91 and second pore columns 92 repeatedly alternate at intervals in the stretch direction ED, the first pore columns in which pores 14 formed in central portions of the sheet joining parts 70 in the stretch direction ED are arranged at intervals in a perpendicular direction XD, and the second pore columns in which pores 14 formed in central portions between sheet joining parts 70 adjacent in the stretch direction ED are arranged at intervals in the perpendicular direction XD. The dimension 91W of the pores 14 of the first pore columns 91 in the stretch direction is longer than the dimension 92W of the pores 14 of the second pore columns 92 in the stretch direction.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a stretchable structure for a disposable wearing article, and a pants-type disposable wearing article having the stretchable structure.

  In disposable wearing articles, it is common to provide a stretchable structure in order to improve the fit of each part. For example, in a disposable diaper of a pants type or a tape type, it is widely performed to provide a stretchable structure in the waistline direction at the waistline part or to provide a stretchable structure in a direction along the leg circumference at the leg circumference part. . Furthermore, in addition to pants-type and tape-type disposable diapers, a wide range of disposable wearing articles including sanitary napkins are also widely used to provide longitudinal stretch structures called three-dimensional gathers and flat gathers (for example, patents). References 1-3).

  A typical example of such a stretchable structure for a disposable wearing article is an elongated elastic member provided between the overlapping first nonwoven fabric layer and the second nonwoven fabric layer along the stretch direction and spaced from each other. It is to be prepared. The first non-woven fabric layer and the second non-woven fabric layer form a planar stretchable region and play a role of covering and concealing the elastic member, and the elastic member incorporated between the first non-woven fabric layer and the second non-woven fabric layer is elastic stretch It plays the role of generating power for The elastic member is fixed in the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends of the stretchable region in the stretched state. By this fixing, the elastic member, the first nonwoven fabric layer, and the second nonwoven fabric layer are integrated, and the first nonwoven fabric layer and the second nonwoven fabric layer are contracted by the contraction force of the elastic member to include wrinkles (including ridges). In the following, the heel is unfolded when it is stretched against the contraction force of the elastic member. Usually, the first nonwoven fabric layer and the second nonwoven fabric layer are in a developed state having no wrinkles at the limit of elastic elongation, wrinkles are accompanied with the contraction of the elastic member, and wrinkles are most closely gathered in the natural length state.

  In such a stretchable structure, when the first nonwoven fabric layer and the second nonwoven fabric layer are free from each other, one nonwoven fabric layer partially or entirely floats with respect to the other nonwoven fabric layer, thereby causing unnecessary wrinkles and swelling. Since there exists a possibility that it may arise, the 1st nonwoven fabric layer and the 2nd nonwoven fabric layer need to be joined directly or indirectly over the whole. Hereinafter, the joint portion between the first nonwoven fabric layer and the second nonwoven fabric layer is referred to as a sheet joint portion. Moreover, in order to produce elasticity by an elastic member, an elastic member is extended over the whole expansion-contraction direction of an expansion-contraction area | region, and the part located in the both ends of the expansion-contraction direction of an expansion-contraction area | region is a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer In the natural length state, the first nonwoven fabric layer and the second nonwoven fabric layer need to be contracted as the elastic member contracts. That is, it is necessary to join the first nonwoven fabric layer and the second nonwoven fabric layer and to fix the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer.

  At present, as a means for fixing the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer, in most cases, a hot melt adhesive is selected. On the other hand, the bonding between the first nonwoven fabric layer and the second nonwoven fabric layer is often performed by welding such as ultrasonic welding in order to reduce the amount of hot melt adhesive used. It is used persistently. For example, by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive at the passing position of the elastic member, the first nonwoven fabric layer and the second nonwoven fabric layer can be joined. A dual-purpose structure that also serves to fix the elastic member to the nonwoven fabric layer is widely used. In addition, a structure in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined at a sheet joining portion that is intermittently arranged in the stretching direction and continues in a direction orthogonal to the stretching direction (hereinafter also simply referred to as an orthogonal direction), A structure is known in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined at a sheet joining portion that is intermittently arranged in the orthogonal direction at a position between the elastic members in the orthogonal direction and that is substantially continuous in the stretching direction. Yes. (See Patent Documents 1 to 3)

  On the other hand, in order to mainly improve air permeability, it has been proposed to provide holes in the first nonwoven fabric layer and the second nonwoven fabric layer (see, for example, Patent Documents 4 to 6).

  Among these, the one described in Patent Document 6 is formed by pressure welding in the thickness direction rectangular sheet joints arranged in a matrix at intervals in the expansion and contraction direction and the direction orthogonal thereto, A hole is formed so as to overlap the sheet joining portion. In this case, the part between the sheet | seat junction parts in an expansion-contraction direction swells in the mutually opposite direction, and the wrinkles extended in an orthogonal direction are formed.

  In the thing of patent document 6, since a hole is arrange | positioned only in the valley bottom between ridges, in order to improve air permeability, it is necessary to enlarge a hole. Further, in order to further improve the air permeability, it is necessary to provide a hole in a portion other than the sheet bonding portion, for example, the top of the ridge.

  On the other hand, the method of forming the hole is not particularly limited, but when the hole is formed by punching, waste material is generated. Therefore, the hole is preferably formed by piercing the pin.

  However, when the hole is formed by piercing the pin, the fiber is pushed out to the periphery when the pin is inserted, so that the edge of the hole becomes denser than the periphery. Therefore, when such a hole is formed large at the top of the ridge, the top of the ridge becomes more flat in the portion having the hole, is low and has a long dimension in the expansion / contraction direction, and is sharper in the portion having no hole. The shape is close to the shape, and the shape is high and the size in the expansion / contraction direction is short. That is, the top of the ridge tends to be uneven, and the planar shape also tends to be a cloud shape. On the other hand, if the holes are uniformly reduced, the improvement in air permeability is limited.

JP 2004-229857 A JP 2013-132331 A JP 2014-209773 A Japanese Patent Laying-Open No. 2015-107223 JP-A-2015-128573 Japanese Patent Laying-Open No. 2015-192862 JP 2011-78477 A

  Then, the main subject of this invention is providing the expansion-contraction structure of the disposable wearing article which can make compatible the improvement of air permeability and the maintenance of the favorable external appearance of a bag.

The stretchable structure of the disposable wearing article that has solved the above problems is as follows.
<First aspect>
Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joint portion where the first nonwoven fabric layer and the second nonwoven fabric layer are joined,
In the stretchable structure of the disposable wearing article, at least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
The sheet bonding portion is provided at least in the expansion / contraction direction with an interval between them,
The arrangement of the holes in the stretchable structure is such that the holes provided at the center of the stretchable direction in the sheet joining portion are arranged adjacent to each other in the stretchable direction and the first hole row arranged in the orthogonal direction with an interval. The second hole row in which the holes provided in the central portion between the sheet joint portions are arranged with an interval in the orthogonal direction are alternately repeated with an interval in the expansion and contraction direction,
The expansion / contraction direction dimension of the hole in the first hole row is longer than the expansion / contraction direction dimension of the hole in the second hole row,
A stretchable structure for a disposable wearing article.

(Function and effect)
In the present stretchable structure, since the sheet joining portions are formed at least at intervals in the stretchable direction, air permeability and flexibility in portions other than the holes are ensured. Moreover, in this expansion-contraction structure, the part between the sheet | seat junction parts in an expansion / contraction direction swells in the direction opposite to each other, thereby forming a ridge extending in the orthogonal direction. Moreover, since the 1st hole row is located in a sheet | seat junction part, and the 2nd hole row | line | column is located in the center part between the adjacent sheet junction parts in an expansion-contraction direction, the hole of a 1st hole row is between ridges. The hole of the second hole row is located at the top of the ridge. And in this expansion-contraction structure, the dimension of the hole is not uniform, and the expansion-contraction direction dimension of the hole in the 1st hole row is a thing longer than the expansion-contraction direction dimension of the hole in the 2nd hole row. That is, this stretchable structure is based on improving air permeability by both the first hole row and the second hole row. Here, the size of the first hole row hardly affects the shape of the top of the ridge, whereas the size of the second hole row strongly affects the shape of the top of the ridge. This telescopic structure makes good use of this. In other words, by making the expansion / contraction direction dimensions of the holes of the first hole row larger than the expansion / contraction direction dimensions of the holes of the second hole row, the overall air permeability is further improved, and the improvement of the air permeability is reduced. The appearance of the bag can be intact.

  In addition, "the arrangement | sequence of the hole in an elastic structure" means the arrangement | sequence which match | combined all the holes in a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer. Therefore, for example, when only one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric, it matches the arrangement of the holes in the perforated nonwoven fabric, but both the first nonwoven fabric layer and the second nonwoven fabric layer. In the case of a perforated nonwoven fabric, even if the arrangement of the holes of each nonwoven fabric layer does not satisfy the conditions of this embodiment, the arrangement of all the holes of both nonwoven fabric layers only needs to satisfy the conditions of this embodiment.

<Second aspect>
The expansion / contraction direction dimension of the hole in the first hole row is 1.5 to 3.0 times the expansion / contraction direction dimension of the hole in the second hole row,
The second hole row is located between the adjacent sheet joint portions,
The expansion-contraction structure of the disposable wearing article of a 1st aspect.

(Function and effect)
The expansion / contraction direction dimension of the holes in the first hole row and the expansion / contraction direction dimension of the holes in the second hole row can be determined as appropriate, but in the normal case, it is preferably within the range of this embodiment.

<Third Aspect>
The arrangement of the holes in the stretchable structure is a matrix in which rows of holes that are linearly spaced in the orthogonal direction are repeated at intervals in the stretchable direction,
In the first hole row, the center of the sheet joining portion in the expansion / contraction direction coincides with the center of the hole in the expansion / contraction direction,
In the first hole row, the dimension of the sheet joining portion in the expansion / contraction direction is 1.5 to 2.0 times the dimension of the hole in the expansion / contraction direction,
The interval in the orthogonal direction of the holes in the first hole row and the second hole row is 0.1 to 1.0 times the interval in the expansion / contraction direction of the first hole row and the second hole row. Is,
The elastic structure of the disposable wearing article of the 1st or 2nd aspect.

(Function and effect)
If the holes form a straight line at a narrow interval in the orthogonal direction as in this embodiment, and both side edges of the sheet joint are located in the vicinity of both sides of the hole, along the direction of the line of holes and Since it becomes easy to bend so that the part which has a hole may become a valley bottom, the wrinkle in a perforated nonwoven fabric comes to be formed more beautifully along an orthogonal direction.

<Fourth aspect>
The dimension of the sheet joint portion in the expansion / contraction direction is 0.5 to 4 mm,
An interval in the expansion / contraction direction of the sheet joint portion is 2.5 to 10.0 mm,
The holes in the first hole row and the second hole row have a dimension in the expansion / contraction direction of 0.3 to 3.0 mm, and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
The interval in the orthogonal direction of the holes in the first hole row and the second hole row is 1.0 to 5.0 mm,
The distance between the first hole row and the second hole row in the expansion / contraction direction is 2.5 to 10.0 mm,
The interval between the elastic members in the orthogonal direction is 5 to 10 mm.
The elastic structure of the disposable wearing article of the third aspect.

(Function and effect)
Although arrangement | positioning of a hole, a sheet | seat junction part, and an elastic member can be determined suitably, it is preferable to be in the range of this aspect.

<Fifth aspect>
The sheet joining portion is obtained by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive,
In the first hole row, a set of a hole and a sheet bonding portion that bonds the edge of the hole to the facing nonwoven fabric is arranged with a gap in the orthogonal direction,
The diameter of each hole in the perforated nonwoven fabric decreases as it goes from the opposite side to the facing nonwoven layer side to the facing nonwoven layer side,
The elastic structure of the disposable wearing article of any one aspect of the 1st-4th.

(Function and effect)
Moreover, in this expansion-contraction structure, the part between the sheet | seat junction parts in an expansion / contraction direction swells in the direction opposite to each other, thereby forming a ridge extending in the orthogonal direction. The space | interval part of the orthogonal | vertical direction of a sheet | seat junction part becomes a trough part between ridges and ridges in the first nonwoven fabric layer and the second nonwoven fabric layer. Here, when the sheet bonded portion is pressure welded in the thickness direction, at the interval portion in the orthogonal direction of the sheet bonded portion, the thickness of the nonwoven fabric layer is restored from the edge of the sheet bonded portion, so that the sheet bonded portions are easily swelled in opposite directions. Become. And if the space | interval part of the orthogonal | vertical direction of a sheet | seat junction part becomes easy to swell in this way, it will be difficult to form the wrinkles which were prepared as a whole, such as a wrinkle branching or a peak part of a wrinkle becoming wide. In order to make this problem difficult to occur, it is necessary to make the interval in the orthogonal direction of the sheet joint portion very narrow, but since it is also necessary to pass an elastic member through the interval portion in the orthogonal direction of the sheet joint portion, the manufacture is It becomes extremely difficult.

  On the other hand, when the sheet joint is bonded with a hot melt adhesive, as in the present stretchable structure, the degree of compression at the sheet joint and the other parts hardly changes. Compared with, the space | interval part of the orthogonal | vertical direction of a sheet | seat junction part is hard to swell in the opposite direction.

  In addition, in this stretchable structure, the diameter of each hole in the perforated nonwoven fabric decreases from the opposite side of the opposing nonwoven fabric layer side toward the opposing nonwoven fabric layer side. As described above, when the diameter of the hole is reduced from the opposite side to the opposite nonwoven layer side toward the opposite nonwoven layer side, the surface opposite to the opposite nonwoven layer is valley-folded in the hole and the vicinity thereof. It is easy to break so that it becomes. Here, in the present stretchable structure, since the hole and the sheet joint portion are arranged in the same manner, the interval portion in the orthogonal direction of the sheet joint portion is affected by the hole adjacent to both sides and the vicinity thereof being easily valley-folded, and the same. It becomes easy to bend in the direction. That is, it becomes difficult for the space | interval part of the orthogonal | vertical direction of a sheet | seat junction part to swell in the opposite direction.

  As a result, it becomes difficult for the gap portions in the orthogonal direction of the sheet joint portion to swell in the opposite direction, so that the ridges do not easily branch or the valley portions do not become wide. It becomes easy to form a cocoon. In other words, when forming a ridge that is arranged to some extent, the interval portion in the orthogonal direction of the sheet joining portion can be made wider than in the case of pressure welding, and a more flexible stretchable structure can be achieved. In addition, in the case where the sheet bonding portion is hot melt bonding, there is no problem even if the sheet bonding portion and the elastic member intersect with each other.

  Furthermore, even if the sheet bonding portion is peeled off due to insufficient adhesion or the like, the gap between the sheet bonding portions in the orthogonal direction of the sheet bonding portion is easily broken so that the surface opposite to the non-woven fabric layer is valley-folded in the vicinity of the hole. There is also an advantage that the part is difficult to bulge in the opposite direction.

  The diameter of the hole means a dimension in a direction that passes through the center of gravity of the hole and is orthogonal to the expansion / contraction direction (therefore, the diameter is a circle in the case of an ellipse, and the major axis is an ellipse).

<Sixth aspect>
In the sheet bonding portion, only the annular portion surrounding the hole and including the edge of the hole is bonded to the facing nonwoven fabric layer via the hot melt adhesive.
The elastic structure of the disposable wearing article of the fifth aspect.

(Function and effect)
Thus, by using only the annular portion in the vicinity of the hole as the sheet joint portion, the air permeability and flexibility are improved. Also, even if hot melt adhesive protrudes into the hole, there is no hot melt adhesive in the center of the hole, and the portion having the hole is located at the bottom of the valley between the hot melts. The adhesive is difficult to touch the skin.

<Seventh aspect>
Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the skin side of the wearer is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the porous nonwoven fabric,
The elastic structure of the disposable wearing article according to any one of the first to sixth aspects.

(Function and effect)
By making the nonwoven fabric layer on the skin side a non-porous nonwoven fabric, it is possible to eliminate the influence of the pores on the touch. Moreover, since only one of the first nonwoven fabric layer and the second nonwoven fabric layer has a hole, the skin is not exposed at the time of wearing, and leakage through the hole can be prevented.

<Eighth aspect>
Both the first nonwoven fabric layer and the second nonwoven fabric layer are the perforated nonwoven fabric, and the holes of one perforated nonwoven fabric do not overlap with the holes of the other perforated nonwoven fabric,
The elastic structure of the disposable wearing article according to any one of the first to sixth aspects.

(Function and effect)
In this aspect, by making both the nonwoven fabric layers porous porous fabrics, higher air permeability can be obtained. Moreover, since the hole of one perforated nonwoven fabric and the hole of the other perforated nonwoven fabric do not overlap, skin is not exposed at the time of mounting | wearing, and the leak through a hole can be prevented.

<Ninth aspect>
An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part A side seal part in which both sides of the outer body of the front body and both sides of the outer body of the back body are joined, a waist opening and a pair of left and right leg openings,
The stretchable structure according to any one of the first to eighth aspects, wherein the exterior body in at least one of the front body and the back body spans at least a width direction range corresponding to the portion between the side seal portions in the front-rear direction. Is provided so that the expansion / contraction direction of the expansion / contraction region is the width direction,
A pants-type disposable wearing article characterized by that.

(Function and effect)
The above-described stretchable structure is suitable for an exterior body of a pants-type disposable wearing article.

  According to the present invention, advantages such as improvement in air permeability and maintenance of a good appearance of the bag can be achieved.

It is a top view which shows the inner surface of the underpants type disposable diaper of an expansion | deployment state. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. It is 2-2 sectional drawing of FIG. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. (A) 4-4 sectional drawing of FIG. 1 and (b) 5-5 sectional drawing of FIG. It is a perspective view (hole omitted) of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body of a unfolded state with the outline of an exterior body. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. (A) 4-4 sectional drawing of FIG. 8 and (b) 5-5 sectional drawing of FIG. It is a top view which shows the example of arrangement | sequence of a hole. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) 6-6 sectional view of FIG. 11, (b) 7-7 sectional view of FIG. 11, (c) sectional view of a portion having a hole and a sheet joint in the contracted state, and (d) sheet in the contracted state It is sectional drawing of the part between junction parts. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) 6-6 cross-sectional view of FIG. 13, (b) 7-7 cross-sectional view of FIG. 13, (c) Cross-sectional view of a portion having a hole and a sheet joint in the contracted state, and (d) In the contracted state It is sectional drawing of the part between sheet | seat junction parts. (A) Cross-sectional view in the front-rear direction in the unfolded state, (b) Cross-sectional view in the width direction in the unfolded state, (c) Cross-sectional view of the portion having the hole and sheet joint in the contracted state, and (d) Sheet joint in the contracted state It is sectional drawing of the part between parts. It is an expanded sectional view of a sheet joined part. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) Front view showing the outer surface of the exterior body in the natural length state, (b) Front view showing the inner surface of the exterior body in the natural length state, (c) Front view showing the outer surface of the exterior body in a state of being stretched to some extent. It is.

  Hereinafter, an example of a pants-type disposable diaper will be described in detail with reference to the accompanying drawings. The dotted pattern in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (Transfer of hot melt adhesive in a relief printing method) or the like, or the fixing portion of the elastic member is formed by application to the outer peripheral surface of the elastic member such as a comb gun or a sheath coating instead of or together with this is there. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

  The pants-type disposable diaper shown in FIGS. 1 to 6 includes a front exterior body 12F that constitutes the front body F, a rear exterior body 12B that constitutes the rear body B, and a rear exterior body from the front exterior body 12F through the crotch portion. An interior body 200 provided inside the exterior bodies 12F and 12B so as to extend to the body 12B. Both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal portion 12A. As a result, the openings formed by the front and rear end portions of the exterior bodies 12F and 12B become the waist openings WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body. The symbol Y in the figure indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X in the unfolded state. The full width of the diaper is shown.

  The pants-type disposable diaper includes a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a portion that forms the leg opening LO. An intermediate region L defined as a front-rear direction range (between a front-rear direction region having the side seal portion 12A of the front body F and a front-rear direction region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where the waist region WO has a boundary where the stretching stress in the width direction WD changes (for example, the thickness of the elastic member or the elongation rate changes), the waist opening WO side is more waist-like than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Inner / outer joint)
The fixing of the inner body 200 to the outer bodies 12F and 12B is not particularly limited, and can be performed by, for example, a hot melt adhesive. In the illustrated example, the inner surface of the exterior body 12F, 12B is applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 in this case and the hot melt adhesive applied to the root portion 65 of the rising gather 60. Is fixed. The inner / outer joint part 201 that fixes the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where both overlap, for example, the inner body 200 may be provided in a portion excluding both ends in the width direction. it can.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a rising gather 60 that extends from both sides of the interior body 200 so as to contact the legs of the wearer in order to prevent excrement from leaking to both sides of the interior body 200.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  Both side portions of the top sheet 30 may be folded back to the back side at the side edge of the absorbent element 50, or may be projected to the side from the side edge of the absorbent element 50 without being folded back.

  The top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional deviation with respect to the back side member. desirable. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be in a state of being. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond nonwoven fabric, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

  The intermediate sheet 40 may be fixed to a member adjacent to the back side by a bonding means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional displacement with respect to the back side member. desirable. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot melt adhesive applied to the back surface thereof.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. The liquid-impermeable sheet 11 is preferably made of a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as coating with a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 to form the side surface of the top sheet 30 of the absorbent element 50. It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

(Get up gather)
The rising gather 60 is for preventing side leakage, extends across the entire front-rear direction LD along both side portions of the interior body 200, and stands up from the side of the interior body 200 to the front side. The rising gather 60 in the illustrated example is such that the base side portion rises obliquely toward the center in the width direction, and the tip side portion rises obliquely outward in the width direction from the intermediate portion, but is not limited thereto. However, it is possible to make appropriate changes such as a configuration in which the whole stands up in the center in the width direction.

  More specifically, the rising gather 60 in the illustrated example folds the belt-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD at the tip portion and folded in two. In addition to overlapping, a plurality of elongated gather elastic members 63 are fixed along the longitudinal direction and spaced apart in the width direction WD between the folded portion and the sheet in the vicinity thereof. The base end portion (the end portion on the side opposite to the sheet folding portion in the width direction WD) of the rising gather 60 opposite to the front end portion is fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the interior body 200. A portion 65 other than the root portion 65 is a main body portion 66 (a portion on the folded portion side) extending from the root portion 65. The main body portion 66 includes a root side portion extending toward the center in the width direction and a tip side portion that is folded back at the tip of the root side portion and extends outward in the width direction. This form is a surface contact type rising gather 60, but a line contact type rising gather 60 that is not folded outward in the width direction can also be used. And while the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed. The gather elastic member 63 along the front-rear direction LD is fixed in an extended state to at least the tip of the free portion 68.

  In the rising gather 60 configured as described above, the contraction force of the gather elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends of the main body portion 66 are fixed so as not to stand up. On the other hand, since there is a non-fixed free portion 68 between them, only the free portion 68 stands up so as to abut on the body side as indicated by an arrow in FIG. In particular, when the root portion 65 is positioned on the back side of the interior body 200, the free portion 68 stands up so as to open outward in the width direction at and around the crotch portion, so that the rising gather 60 abuts on the surface around the legs. As a result, the fit is improved.

(Absorption element)
Although the absorption element 50 is not specifically limited, In this example, it has the absorber 56 and the packaging sheet 58 which wraps this absorber 56 whole. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may be rectangular, but as shown in FIG. 7, the absorber 56 includes a front end portion, a rear end portion, and a constricted portion 56 </ b> N that is located between these and narrower than the front end portion and the rear end portion. The hourglass shape is preferred because the fit of the absorber 56 and the rising gather 60 around the legs is improved.

  Further, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. . Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of disposable diaper can be used as they are.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² .

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
The exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD (exterior two-split type). This separation distance 12d can be, for example, about 40 to 60% of the total length Y. Moreover, as shown in FIG.8 and FIG.9, the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B (exterior integral type).

  In the exterior two-divided type pants-type disposable diaper, since the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200. The cover nonwoven fabric 20 covering the back surface of the interior body 200 is preferably provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200. The material of the cover nonwoven fabric 20 is not particularly limited. For example, the same material as the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H of the outer package 12 (a porous nonwoven fabric layer or a nonporous nonwoven fabric layer described later) may be used. . The front-rear direction range of the cover nonwoven fabric 20 is not particularly limited as long as it has portions overlapping the front exterior body 12F and the rear exterior body 12B, and extends in the front-rear direction LD over the entire front end to rear end of the interior body 200. As shown in FIG. 7, the intermediate position in the front-rear direction of the region where the rear exterior body 12B and the interior body 200 overlap from the front-rear direction intermediate position of the region where the front exterior body 12F and the interior body 200 overlap. It may extend in the front-rear direction LD.

  The exterior bodies 12 </ b> F and 12 </ b> B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion C that extends from the waist region T to the intermediate region L side. is doing. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. Further, in the illustrated example, the lower edge of the collar cover portion C is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F. It can also be a curve that becomes.

  As shown in FIGS. 2 to 5, the exterior bodies 12 </ b> F and 12 </ b> B are formed with the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H. Needless to say, either the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H corresponds to the first nonwoven fabric layer of the present invention, and the other corresponds to the second nonwoven fabric layer of the present invention. As shown in FIG. 5, the nonwoven fabric layer 12H is formed by folding one sheet material so that the crease is positioned on the waist opening side, and bonding two sheet materials together as shown in FIG. It can also be formed. Further, the innermost portion 12r of these sheet materials can be extended to the end of the interior body 200 on the waist opening WO side (see the example in FIG. 9). Further, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be formed of a sheet material that is partially different from the other portions.

  As constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (including single-component fibers and composite fibers such as core sheaths) In addition, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and the like can be selected without particular limitation, and these can also be used as a mixture. In order to increase the flexibility of the nonwoven fabric layers 12S and 12H, it is preferable that the constituent fibers are crimped fibers. Further, the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be hydrophilic fibers (including hydrophobic fibers made hydrophilic by a hydrophilizing agent) or hydrophobic fibers or water repellent fibers (water repellent fibers). (Including water-repellent fibers made water-repellent by an agent). Nonwoven fabrics are generally short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punches, depending on fiber length, sheet formation method, fiber bonding method, and laminated structure. These are classified into non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics with a melt-blown layer sandwiched between spunbond layers, SMMS non-woven fabrics, etc.). Can do.

Although the fineness and the basis weight of the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H can be determined as appropriate, they are preferably about 1.8 to 6.0 dtex and about 10 to 30 g / m ² , respectively.

(About perforated nonwoven fabric)
As shown in FIGS. 2, 8, 11, and 12, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a perforated nonwoven fabric in which holes 14 penetrating in the thickness direction are scattered. As shown in FIGS. 11 and 12, when the inner nonwoven fabric layer 12H on the skin side of the wearer is a non-porous nonwoven fabric and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, the influence on the touch of the holes 14 is eliminated. Can do. Moreover, since the hole 14 is provided in only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. Although not shown, the inner nonwoven fabric layer 12H on the skin side of the wearer may be a perforated nonwoven fabric, and the outer nonwoven fabric layer 12S may be a nonporous nonwoven fabric. As shown in FIG.13 and FIG.14, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap. A structure is also preferable. In this case, higher air permeability can be obtained by making both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H porous. Moreover, since the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. As shown in FIG. 15, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric are completely or partially. May overlap. In addition, although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, in most cases (for example, an area of 50% or more), the holes 14 of one perforated nonwoven fabric and the other perforated nonwoven fabric are formed. Although the hole 14 of the porous nonwoven fabric does not overlap, in some cases, the hole 14 of one porous nonwoven fabric and the hole 14 of the other porous nonwoven fabric may overlap.

  The planar shape (opening shape) of each hole 14 can be determined as appropriate. The hole 14 has a long hole shape as shown in FIGS. 10 (a) and 10 (b), a perfect circle as shown in FIG. 10 (e), an ellipse, a triangle and a rectangle as shown in FIG. 10 (d). , Polygons such as rhombuses, stars, clouds, etc. As shown in FIG. 10C, holes having different shapes may be mixed. The dimension of each hole 14 is not particularly limited, but the dimension 14L in the orthogonal direction XD (the dimension of the longest part) is preferably 0.3 to 5.0 mm, particularly preferably 0.6 to 2.0 mm, and the width direction. The WD dimension (longest part dimension) 14W is preferably 0.3 to 3.0 mm, particularly preferably 0.4 to 1.5 mm. When the shape of the hole 14 is a long shape in one direction such as a long hole shape, an ellipse shape, a rectangular shape, a rhombus shape, etc. (a shape in which the total length in one direction is longer than the total length in the direction perpendicular thereto), the dimension in the longitudinal direction It is preferable that (the dimension of the longest part) is 1.2 to 2.5 times the dimension (the dimension of the longest part) in the direction orthogonal thereto. Moreover, when the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.

Although individual area and the area ratio of the holes 14 may be appropriately determined, it is preferable that the area is 0.1~2.7mm ² (especially 0.1 to 1.0 mm ²⁾ about, the area ratio 1. It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).

  The planar arrangement of the holes 14 in one perforated nonwoven fabric is not particularly limited. Thus, for example, although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H have at least one of the size, shape, and arrangement of the holes 14. May be different.

  On the other hand, the planar arrangement of the holes 14 obtained by combining all the holes 14 in the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H (that is, when all the holes 14 are projected onto a plane) is the expansion / contraction direction ED in the sheet bonding portion 70 described later. The hole 14 provided in the central portion between the first hole row 91 in which the holes 14 provided in the central portion are arranged at intervals in the orthogonal direction XD and the adjacent sheet joining portions 70 in the expansion / contraction direction ED is the orthogonal direction As long as the second hole rows 92 arranged at intervals in XD are alternately repeated at intervals in the expansion / contraction direction ED, it can be determined as appropriate. For example, as shown in FIGS. 10A, 10C, and 10D, the arrangement of all the holes 14 is such that the rows of the holes 14 arranged linearly at predetermined intervals in the orthogonal direction XD are arranged in the expansion / contraction direction ED. It is preferable that the matrix is repeated at a predetermined interval. In this case, as shown in FIG. 10A, the interval 14x in the expansion / contraction direction ED between the first hole row 91 and the second hole row 92 is equal to the orthogonal direction XD of the holes 14 in the first hole row 91. In addition to the arrangement shorter than the interval 91y, as shown in FIG. 10C, the interval 14x in the expansion / contraction direction ED between the first hole row 91 and the second hole row 92, and the first hole row 91 As shown in FIG. 10 (d), an interval 14x in the expansion / contraction direction ED between the first hole row 91 and the second hole row 92 is equal to the first The arrangement can be longer than the interval 91 y in the orthogonal direction XD of the holes 14 in one hole row 91. Further, as shown in FIGS. 10B and 10E, the position of the hole 14 in the orthogonal direction XD in the first hole array 91 and the position of the hole 14 in the orthogonal direction XD in the second hole array 92 are shifted. May be. In addition, as shown in FIG. 10 (f), the holes 14 may be arranged in a wavy line having a center line along the orthogonal direction as long as the adjacent hole rows 91 and 92 have a portion continuous in the orthogonal direction XD. The row of the holes 14 arranged at intervals in the direction orthogonal to the expansion / contraction direction ED is included in the arrangement of the holes 14 arranged at intervals in the expansion / contraction direction ED.

  The orthogonal interval 91y between the holes 14 in the first hole row 91 and the expansion / contraction direction interval 14x between the first hole row 91 and the second hole row 92 may be constant or may vary. Although these can be determined as appropriate, in consideration of air permeability, the orthogonal interval 91y of the holes 14 in the first hole row 91 is within a range of 0.9 to 8.0 mm, particularly 1.0 to 3.0 mm. Desirably, the distance 14x between the first hole row 91 and the second hole row 92 in the expansion / contraction direction is preferably 2.0 to 8.0 mm, particularly 2.0 to 5.0 mm. In addition, the orthogonal interval 92 y of the holes 14 in the second hole array 92 is preferably 1.0 to 3.0 times the orthogonal interval 91 y of the holes 14 in the first hole array 91.

  The cross-sectional shape of the hole 14 is not particularly limited. For example, even if the hole 14 is a punched type hole whose periphery is formed by a cut end of the fiber, the hole 14 has almost no cut end of the fiber, and a pin is inserted between the fibers to be expanded. It may be a non-punched type hole (having a high fiber density at the edge). As shown in FIG. 16 (d), the punched-type hole has a diameter that decreases as it goes toward the middle in the thickness direction, although it is not shown, it decreases as it goes toward one side in the thickness direction. May be.

  The non-punched hole 14 is such that the diameter of the hole 14 decreases from the pin insertion side toward the opposite side. This includes a case where the diameter of the hole 14 continues to decrease over the entire thickness direction of the nonwoven fabric layer, and a case where the decrease in the diameter of the hole 14 almost disappears in the middle of the thickness direction. In such a non-punched hole, as shown in FIGS. 16 (a) and 16 (c), a fiber is pushed out to the edge of the hole 14 on the side opposite to the pin insertion side and pushed out to the side opposite to the pin insertion side. The part (burr) 14e is formed, and the protrusion 14e is not formed on the pin insertion side, and the fiber is inserted into the edge of the hole 14 on the side opposite to the pin insertion side as shown in FIG. The protrusion 14e pushed out to the opposite side is formed, and the pin insertion side includes the protrusion 14e formed by pushing out the fiber to the pin insertion side. Further, in the former type of hole 14, the protrusion 14 e has a substantially uniform height 14 h as shown in FIG. 16A, and the protrusion 14 e as shown in FIG. This includes a facing portion having the highest protruding height 14i and a facing portion facing in a direction perpendicular to the protruding portion and having the lowest protruding height 14j. Although it is desirable that the protruding portion 14e has a cylindrical shape continuously in the circumferential direction of the hole, the protruding portion 14e of a part or all of the holes 14 is formed only in a part of the circumferential direction of the hole 14. Also good. The protruding heights 14h, 14i, and 14j (apparent height in a state where no pressure is measured using an optical microscope) is preferably about 0.2 to 1.2 mm. The highest protrusion height 14i in the protrusion 14e is preferably about 1.1 to 1.4 times the lowest protrusion height 14j. The protruding height of the protruding portion 14 e may change in the circumferential direction of the hole 14.

  For example, when a hole 14 having a long shape in one direction as shown in FIGS. 10A, 10B, and 10D is formed by inserting a pin, fibers at the edge of the hole 14 are retracted outward or vertically. A protruding portion (burr) 14e is formed in which the protruding height i of the opposing portion in the longitudinal direction of the hole 14 is higher than the protruding height j of the opposing portion in the direction orthogonal to the longitudinal direction. The protruding portion 14e of the hole 14 may have a fiber density that is lower than that of the surrounding portion, but is preferably the same or higher.

The fineness, basis weight and thickness of the constituent fibers of the perforated nonwoven fabric can be determined as appropriate, but in the normal case, about 1.8 to 6.0 dtex, about 15 to 25 g / m ^{2 and} about 0.1 to 1.3 mm, respectively. Is preferable. Further, the MD softness of the perforated nonwoven fabric (width direction) is preferably 35 to 100 mm, particularly 40 to 70 mm in a non-porous state before perforation, and 10 to 50 mm in a state after perforation. In particular, the thickness is preferably 15 to 40 mm.

(Elastic area)
In the exterior bodies 12F and 12B, an elongated elastic member 19 is provided between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, and an expansion / contraction region A2 is formed that elastically expands and contracts in the width direction WD as the elastic member 19 expands and contracts. ing. That is, in the stretchable region A2, in the natural length state, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H contract with the contraction of the elastic member and have a large number of wrinkles. Moreover, if this expansion-contraction area | region A2 is extended | stretched in the width direction WD, it will extend | stretch to the predetermined | prescribed expansion | extension rate which the outer side nonwoven fabric layer 12S and the inner side nonwoven fabric layer 12H extend completely. The elastic member 19 can be used in any shape, e.g., a thread shape, a string shape, and a belt shape, as long as it is elongated. The elastic member 19 may be made of synthetic rubber or natural rubber.

  As shown in FIGS. 11 and 13, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at least at both ends in the stretching direction ED in the stretching region A2. The fixing means for the elastic member 19 is not particularly limited, but it is preferable to use the hot melt adhesive 19H. As shown in FIG. 11, one preferred form is that after hot melt adhesive 19H is intermittently applied to the outer peripheral surfaces of both ends in the expansion / contraction direction ED of the elastic member 19 by application means such as a comb gun or a sure wrap nozzle. The elastic member 19 is sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H via the hot melt adhesive 19H only at both ends in the stretching direction ED in the stretchable region. Although a simpler form is not shown, after the hot melt adhesive is continuously applied to the outer peripheral surface of the elastic member 19 by application means such as a comb gun or a sure wrap nozzle, the elastic member 19 is applied to the outer nonwoven fabric layer 12S and the inner side. It is sandwiched between the nonwoven fabric layers 12H. In this case, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the entire longitudinal direction as well as both ends in the stretching direction ED in the stretchable region at the arrangement site. As another form, as shown in FIG. 13, hot melt adhesive 19 </ b> H is applied to the arrangement positions of both ends of the elastic member 19 in the expansion / contraction direction ED on at least one facing surface of the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H. After the application, an elastic member can be sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, the hot melt adhesive 19H may be continuous in the orthogonal direction XD as in the illustrated example, or may be intermittently disposed in the orthogonal direction XD although not illustrated. Further, in these cases, the continuous portion of the hot melt adhesive 19H may extend over a plurality of elastic members as in the illustrated example.

In the case of a pants-type disposable diaper such as the illustrated example, it is desirable to provide the elastic member 19, that is, the stretchable region at the following site. That is, a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist portion W of the exterior bodies 12F and 12B. Attached. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic members 17, you may overlap with the interior body 200 or the width direction center which overlaps with the interior body 200 You may provide each in the width direction both sides except a part. The waist elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm approximately ²⁾ is preferably provided about 3 to 22 present at intervals of 4 to 12 mm, which by extension ratio in the width direction WD of the waist portion W is 150% to 400%, especially at about 220 to 320 percent Preferably there is. Further, the waist portion W does not need to use the same thickness waist portion elastic member 17 in all of the front-rear direction LD or have the same elongation rate. The thickness and elongation rate may be different.

  Further, a plurality of waist lower part elastic members 15 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist lower part U of the exterior bodies 12F and 12B. It has been.

The waist lower part elastic member 15 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 1 to 15 mm, particularly preferably to dispose 5-30 present at intervals of 3 to 8 mm, this elongation in the width direction WD of the waist lower portion U by 200 to 350%, in particular It is preferably about 240 to 300%.

  Further, a plurality of cover elastic members 16 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the buttock cover portion C of the rear exterior body 12B. ing.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1.0 mm. ^It is preferable that about 2 to 10 thread rubbers are provided at intervals of 5 to 40 mm, particularly 5 to 20 mm, and the elongation ratio of the cover portion in the width direction WD is 150 to 300%, particularly 180 to 260. % Is preferred.

  In the case of providing a groin cover portion on the front exterior body 12F, a cover portion elastic member can be similarly provided.

(Non-stretchable area)
When the elastic members 15 and 16 are provided in the front-rear direction range having the absorber 56 like the lower waist portion U and the buttock cover portion C in the illustrated example, a part or all of the elastic members 15 and 16 in the width direction WD of the absorber 56. In order to prevent shrinkage, the intermediate in the width direction (preferably including the entire inner / outer joint portion 201) including part or all of the portion overlapping the absorber 56 and the width direction WD is defined as the non-stretchable region A1, and the width direction Both sides are taken as the stretchable area A2. The waist portion W is preferably the stretchable region A2 over the entire width direction WD, but similarly to the waist lower portion U, a non-stretchable region A1 may be provided in the middle in the width direction.

  The stretchable region A2 and the non-stretchable region A1 supply the elastic members 15 and 16 between the inner nonwoven fabric layer 12H and the outer nonwoven fabric layer 12S, and the elastic members 15 and 16 are at least both ends in the stretchable direction ED in the stretchable region A2. In the region that becomes the non-stretchable region A1, the elastic members 15 and 16 are pressed and applied at one place in the middle of the width direction in the region that becomes the non-stretchable region A1. It can be constructed by cutting by heating, or by cutting almost the entire elastic members 15 and 16 finely by pressurization and heating, leaving the stretchability in the stretchable region A2 and killing the stretchability in the non-stretchable region A1. . In the former case, as shown in FIG. 4, the non-stretchable region A1 has an outer nonwoven fabric in a state in which the uncut stretched region A2 is continuously cut from the elastic members 15 and 16 of the stretchable region A2 to the natural length alone as the unnecessary elastic member 18. In the latter case, it remains between the layer 12S and the inner nonwoven fabric layer 12H. Although not shown in the drawing, the cut residue continuous from the elastic members 15 and 16 in the elastic region A2 and the elastic members 15 and 16 in both elastic regions A2 are continuous. The cut piece of the elastic member that is not left is left between the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H in a state where the cut piece of the elastic member is contracted to the natural length alone as an unnecessary elastic member.

(Junction structure of outer nonwoven fabric layer and inner nonwoven fabric layer)
As shown in FIGS. 11 to 15, the sheet bonding portion 70 is repeatedly provided in the expansion / contraction region A <b> 2 at least in the expansion / contraction direction ED. Therefore, air permeability and flexibility in portions other than the holes 14 are also ensured. The sheet bonding portion 70 is continuous in the orthogonal direction XD so as to pass through the plurality of holes 14 as in the example shown in FIG. 17 (in addition to the case where the sheet bonding portion 70 is continuous over the entire orthogonal direction XD of the stretchable region A2, (In some cases, only a part of the intersecting range may be continuous), or in the orthogonal direction XD as well as the expansion / contraction direction ED as in the example shown in FIG. As shown in the figure, only one hole 14 may be provided). In any case, in the present stretchable structure, as shown in FIGS. 12 (c) (d), 14 (c) (d), and 15 (c) (d), the outer nonwoven fabric is contracted as the elastic member 19 contracts. The portions located between the sheet joining portions 70 in the layer 12S and the inner nonwoven fabric layer 12H are contracted and swelled in opposite directions to form the ridge 80. As shown in FIGS. 18A and 18B, the flange 80 extends in the orthogonal direction XD.

  The dimensions and the like of the sheet bonding portion 70 can be determined as appropriate. In a normal case, the dimension 70W in the expansion / contraction direction ED of the sheet bonding portion 70 is 0.5 to 4 mm, and the interval 70x of the expansion / contraction direction ED of the sheet bonding portion 70 is. Is preferably 2.5 to 10.0 mm. Further, as in the example shown in FIGS. 11 and 13, when the sheet bonding portion 70 is provided not only in the expansion / contraction direction ED but also in the orthogonal direction XD, the sheet bonding portion 70 is arranged in the orthogonal direction XD. The dimension 70L is preferably 0.5 to 4 mm, and the interval 70y in the orthogonal direction XD of the sheet bonding portion 70 is preferably 1.0 to 5.0 mm.

  The sheet joining portion 70 in the illustrated example is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via the hot melt adhesive 14H welding, but the portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are welded. It may be.

  As described above, the arrangement of the holes 14 in the expansion / contraction structure is such that the holes 14 provided at the center of the expansion / contraction direction ED in the sheet joining portion 70 are arranged in the orthogonal direction XD with an interval in the orthogonal direction XD, and the expansion / contraction direction. A second hole array 92 in which holes 14 provided in the central portion between adjacent sheet joining portions 70 in the ED are arranged at intervals in the orthogonal direction XD are alternately repeated at intervals in the expansion / contraction direction ED. It has become. Therefore, in the present telescopic structure, the first hole row 91 is located at the sheet joining portion 70, and the second hole row 92 is located at the central portion between the adjacent sheet joining portions 70 in the stretching direction ED. The hole 14 of the first hole row 91 is located at the bottom of the valley between the ridges 80, and the hole 14 of the second hole row 92 is located at the top of the ridge 80. Therefore, in a state of contracting to some extent, such as a natural length state, the second hole row 92 is exposed at the top of the ridge 80 as shown in FIG. The hole row 91 is hidden. Further, in a state of being extended to some extent as in the mounted state or the like, as shown in FIG. 18 (c), the interval between the flanges 80 is opened, and the first hole row 91 is also exposed.

  And in this expansion-contraction structure, the dimension of the hole 14 is not uniform, and the expansion-contraction direction dimension 91W of the hole 14 in the first hole array 91 is larger than the expansion-contraction direction dimension 92W of the hole 14 in the second hole array 92. It has been long. That is, the present telescopic structure is basically to improve the air permeability by both the first hole row 91 and the second hole row 92. Here, the size of the first hole row 91 hardly influences the shape of the top portion of the ridge 80, whereas the size of the second hole row 92 strongly affects the shape of the top portion of the ridge 80. . This telescopic structure makes good use of this. That is, by making the expansion / contraction direction dimension 91W of the hole 14 of the first hole row 91 larger than the expansion / contraction direction dimension 92W of the hole 14 of the second hole row 92, the overall air permeability is further improved. Although the air permeability is improved, the outer appearance of the ridge 80 can be kept intact.

  The expansion / contraction direction dimension 91W of the hole 14 in the first hole row 91 and the expansion / contraction direction dimension 92W of the hole 14 in the second hole row 92 can be determined as appropriate, but in the normal case, the hole in the first hole row 91 The expansion / contraction direction dimension 91W of 14 is 1.5 to 3.0 times the expansion / contraction direction dimension 92W of the hole 14 in the second hole row 92, and the second hole row 92 is located between adjacent sheet joints 70. It is preferable to be located at.

  Although the arrangement of the holes 14 is not limited, in the first hole row 91, the sheet joint portion 70 and the holes 14 are arranged in combination. The arrangement of the sheet bonding portion 70 affects the shape of the flange 80. Therefore, in consideration of these, the arrangement of the holes 14 when all the holes 14 are combined is a matrix in which a row of holes 14 linearly spaced in the orthogonal direction XD repeats with an interval in the expansion / contraction direction ED. Yes, in the first hole row 91, when the center of the expansion / contraction direction ED of the sheet joint portion 70 coincides with the center of the expansion / contraction direction ED of the hole 14, the flange extends linearly along the orthogonal direction XD, It is preferable because it has a clean appearance. Here, the dimension 70W in the expansion / contraction direction ED of the sheet joining portion 70 is 1.5 to 2.0 times the dimension 14W in the expansion / contraction direction ED of the hole 14 in the first hole array 91. The interval 14y in the orthogonal direction XD of the holes 14 in the second hole row 92 is 0.1 to 1.0 times the interval 14x in the expansion / contraction direction ED of the first hole row 91 and the second hole row 92. And more preferable. In this way, when the holes 14 form a straight line at a narrow interval in the orthogonal direction XD, and both side edges of the sheet joint portion 70 are located in the vicinity of both sides of the hole 14, Since it becomes easy to bend so that the part which has the hole 14 may become a valley bottom along, the wrinkle in a perforated nonwoven fabric comes to be formed more beautifully along the orthogonal direction XD.

The specific dimensions and arrangement of the holes 14 and the arrangement of the elastic members in this matrix arrangement can be determined as appropriate, but are particularly preferably within the following ranges.
The dimension 70W of the expansion / contraction direction ED of the sheet joining portion 70 is 0.5 to 4 mm,
The interval 70x in the expansion / contraction direction ED of the sheet joining portion 70 is 2.5 to 10.0 mm,
Dimension 91W in the expansion / contraction direction ED of the holes 14 in the first hole row 91: 0.3 to 3.0 mm
Dimension 92W of expansion / contraction direction ED of hole 14 in second hole row 92: 0.1 to 2.0 mm
Dimension 91L in the orthogonal direction XD of the holes 14 in the first hole row 91: 0.3 to 5.0 mm
Dimension 92L in the orthogonal direction XD of the holes 14 in the second hole row 92: 0.1 to 5.0 mm
Spaces 91y, 92y in the orthogonal direction XD of the holes 14 in the first hole row 91 and the second hole row 92: 1.0 to 5.0 mm
Spacing 91x and 92x in the expansion / contraction direction ED of the first hole row 91 and the second hole row 92: 2.5 to 10.0 mm
Spacing between elastic members 19 in the orthogonal direction XD: 5 to 10 mm

  In the case where the sheet bonding portion 70 is provided not only in the expansion / contraction direction ED but also in the orthogonal direction XD, the sheet bonding portion 70 is bonded to the nonwoven fabric facing the hole 14 and the edge of the hole 14 in the first hole 14 row. Are preferably arranged with a gap in the orthogonal direction XD. As described above, in this stretchable structure, as shown in FIGS. 12 (c) (d), 14 (c) (d), and 15 (c) (d), in a natural length or in a mounted state contracted to some extent. In addition, as the elastic member 19 contracts, the portions of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H that are located between the sheet joining portions 70 contract, and bulge in opposite directions to form wrinkles. This ridge extends in the orthogonal direction XD. As shown in FIGS. 12 (d), 14 (d), and 15 (d), the interval portion in the orthogonal direction XD of the sheet joining portion 70 is ridges 80 and 襞 80 in both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. It becomes a valley between. Here, when the sheet bonding portion 70 is bonded by the hot melt adhesive 14H, the degree of compression in the sheet bonding portion 70 and other portions is almost the same, so that the sheet bonding is compared with the case of pressure welding. The interval portion in the orthogonal direction XD of the portion 70 is unlikely to swell in the opposite direction. Moreover, in this stretchable structure, the diameter of each hole 14 in the perforated nonwoven fabric decreases from the opposite side of the opposing nonwoven fabric 150 layer side toward the opposing nonwoven fabric layer side. Thus, when the diameter of the hole 14 becomes smaller as it goes from the opposite side to the opposing nonwoven fabric layer side to the opposing nonwoven fabric layer side, the surface opposite to the opposing nonwoven fabric layer is present in the hole 14 and its vicinity. It is easy to fold like a valley fold. Here, since the hole 14 and the sheet joint portion 70 are arranged in the same manner in this stretchable structure, the gap portion in the orthogonal direction XD of the sheet joint portion 70 is likely to be valley-folded in the hole 14 adjacent to both sides and the vicinity thereof. Affected and easy to break in the same direction. That is, the interval portion in the orthogonal direction XD of the sheet bonding portion 70 is less likely to bulge in the opposite direction. This is the same even if the sheet joint is peeled off due to insufficient adhesion or the like. As a result, the interval portion in the orthogonal direction XD of the sheet joining portion 70 is less likely to bulge in the opposite direction, and as a result, the ridge 80 is less likely to branch or the valley portion is partially widened. It is easy to form a regular ridge 80 extending along. In other words, when forming the ridge 80 that is arranged to some extent, the interval portion in the orthogonal direction XD of the sheet joining portion 70 can be made wider than in the case of pressure welding, and a more flexible stretchable structure can be achieved. . In addition, in the case where the sheet bonding portion 70 is hot melt bonding, there is no problem even if the sheet bonding portion 70 and the elastic member 19 intersect with each other, so that the manufacture is facilitated.

  As shown in FIG. 16 (a), a typical adhesion state in the case where the edge of the hole 14 is bonded to the opposing nonwoven fabric is such that the entire portion overlapping the hole 14 and the edge of the hole 14 are hot melt. A state of being bonded to the facing nonwoven fabric layer 12H through the adhesive 14H, as shown in FIGS. 16B and 16C, only the annular portion surrounding the center of the hole 14 and including the edge of the hole 14 However, the state which is adhere | attached with the nonwoven fabric layer 12H which opposes via the hot-melt-adhesive 14H can be illustrated. As in the latter case, only the annular portion in the vicinity of the hole 14 is used as the sheet joining portion 70, so that air permeability and flexibility are improved. In addition, even if the hot melt adhesive 14H protrudes into the hole 14, the hot melt adhesive 14H does not exist in the center of the hole 14, and the portion having the hole 14 is in the valley bottom between the ridges 80. Therefore, the hot melt adhesive 14H is difficult to touch the skin. In each of the examples shown in FIG. 16, a protruding portion 14e is formed on the facing surface. In the state shown in FIG. 16A, the hot melt adhesive 14H is present on the entire protrusion and the inside thereof, and in the state shown in FIG. 16B, the hot melt adhesive 14H is present only on the protrusion 14e. In the state shown in FIG. 16C, the hot melt adhesive 14H is present on the periphery of the portion overlapping the hole 14 and on the outside of the protrusion 14e.

  Although the hole 14 and the sheet | seat junction part 70 can also be provided only in the expansion-contraction area | region A2, as shown in the example shown in FIG.8 and FIG.9, it can be provided over a wider range area | region including the non-expandable area | region A1.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

  The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.

  -"MD direction" and "CD direction" mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular thereto, and either one is the front-rear direction, and the other Is the width direction. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, and the tensile strength ratio in the front-rear direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.

  “Center” with respect to a closed planar shape means the center of gravity in the case of a figure having no center.

  ・ "Front side" means the person near the wearer's skin when wearing a pants-type disposable diaper, and "Back" means the person far from the wearer's skin when wearing a pants-type disposable diaper .

  ・ "Surface" means the surface closer to the wearer's skin when wearing a pants-type disposable diaper, and "Back" refers to the skin of the wearer when wearing a pants-type disposable diaper. It means the far side.

-“Area ratio” means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (for example, holes) in the target region (for example, non-woven fabric) by the area of the target region. is there. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio. For example, the area ratio of the pores can be measured by the following procedure using, for example, a trade name VHX-1000 of KEYENCE Corporation and measuring conditions 20 times.
(1) Set on a 20x lens and adjust the focus. The position of the nonwoven fabric is adjusted so that the holes are 4 × 6.
(2) Specify the brightness of the hole area and measure the area of the hole.
(3) Click the “Area measurement” color extraction in “Measurement / Comments”. Click on the hole.
(4) Click “Batch measurement”, check “Display measurement result window”, and save as CSV data.

  “Elongation rate” means a value when the natural length is 100%.

  -"Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt% 1.0 g of a superabsorbent polymer is added to 49.0 g of the mixture) and stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

  ・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated and used as the basis weight.

-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

  “Bending softness” means “8.21.1 A method (45 ° cantilever method)” of JIS L 1096: 2010 “Fabric and knitted fabric testing method”. When the non-porous nonwoven fabric before punching is not available, the value of the porous nonwoven fabric before punching (non-porous nonwoven fabric) is the same as the non-porous nonwoven fabric (fiber composition, fineness, basis weight, thickness, etc.). Prepare and measure.

  -The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".

  ・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

  -"Developed state" means a state where the plate is flattened without contraction or slack.

  -Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.

  ・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard state (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

  INDUSTRIAL APPLICABILITY The present invention can be used for all disposable wearing articles such as pants-type disposable diapers and tape-type disposable diapers, pad-type disposable diapers, disposable swimwear, diaper covers, sanitary napkins and the like.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner nonwoven fabric layer, 12S ... Outer nonwoven fabric layer, 14 ... Hole, 14e ... Projection, 14H ... hot melt adhesive, 14r ... square, 18 ... unnecessary elastic member, 19 ... elastic member, 20 ... cover nonwoven fabric, 200 ... interior body, 201 ... inner / outer joint, 30 ... top sheet, 40 ... intermediate sheet , 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gathering, 62 ... Gathered nonwoven fabric, 70 ... Sheet joint, 80 ... Spear, 91 ... First hole row, 92 ... Second hole Row, A1 ... non-stretchable area, A2 ... stretchable area, C ... buttocks cover part, L ... intermediate area, LD ... longitudinal direction, LO ... leg opening, T ... waist circumference area, U ... waist lower part, W ... waist part , WD ... width direction, O ... waist-opening, XD ... the orthogonal direction, ED ... expansion and contraction direction.

  The present invention relates to a stretchable structure for a disposable wearing article, and a pants-type disposable wearing article having the stretchable structure.

  In disposable wearing articles, it is common to provide a stretchable structure in order to improve the fit of each part. For example, in a disposable diaper of a pants type or a tape type, it is widely performed to provide a stretchable structure in the waistline direction at the waistline part or to provide a stretchable structure in a direction along the leg circumference at the leg circumference part. . Furthermore, in addition to pants-type and tape-type disposable diapers, a wide range of disposable wearing articles including sanitary napkins are also widely used to provide longitudinal stretch structures called three-dimensional gathers and flat gathers (for example, patents). References 1-3).

  A typical example of such a stretchable structure for a disposable wearing article is an elongated elastic member provided between the overlapping first nonwoven fabric layer and the second nonwoven fabric layer along the stretch direction and spaced from each other. It is to be prepared. The first non-woven fabric layer and the second non-woven fabric layer form a planar stretchable region and play a role of covering and concealing the elastic member, and the elastic member incorporated between the first non-woven fabric layer and the second non-woven fabric layer is elastic stretch It plays the role of generating power for The elastic member is fixed in the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends of the stretchable region in the stretched state. By this fixing, the elastic member, the first nonwoven fabric layer, and the second nonwoven fabric layer are integrated, and the first nonwoven fabric layer and the second nonwoven fabric layer are contracted by the contraction force of the elastic member to include wrinkles (including ridges). In the following, the heel is unfolded when it is stretched against the contraction force of the elastic member. Usually, the first nonwoven fabric layer and the second nonwoven fabric layer are in a developed state having no wrinkles at the limit of elastic elongation, wrinkles are accompanied with the contraction of the elastic member, and wrinkles are most closely gathered in the natural length state.

  In such a stretchable structure, when the first nonwoven fabric layer and the second nonwoven fabric layer are free from each other, one nonwoven fabric layer partially or entirely floats with respect to the other nonwoven fabric layer, thereby causing unnecessary wrinkles and swelling. Since there exists a possibility that it may arise, the 1st nonwoven fabric layer and the 2nd nonwoven fabric layer need to be joined directly or indirectly over the whole. Hereinafter, the joint portion between the first nonwoven fabric layer and the second nonwoven fabric layer is referred to as a sheet joint portion. Moreover, in order to produce elasticity by an elastic member, an elastic member is extended over the whole expansion-contraction direction of an expansion-contraction area | region, and the part located in the both ends of the expansion-contraction direction of an expansion-contraction area | region is a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer In the natural length state, the first nonwoven fabric layer and the second nonwoven fabric layer need to be contracted as the elastic member contracts. That is, it is necessary to join the first nonwoven fabric layer and the second nonwoven fabric layer and to fix the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer.

  At present, as a means for fixing the elastic member to the first nonwoven fabric layer and the second nonwoven fabric layer, in most cases, a hot melt adhesive is selected. On the other hand, the bonding between the first nonwoven fabric layer and the second nonwoven fabric layer is often performed by welding such as ultrasonic welding in order to reduce the amount of hot melt adhesive used. It is used persistently. For example, by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive at the passing position of the elastic member, the first nonwoven fabric layer and the second nonwoven fabric layer can be joined. A dual-purpose structure that also serves to fix the elastic member to the nonwoven fabric layer is widely used. In addition, a structure in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined at a sheet joining portion that is intermittently arranged in the stretching direction and continues in a direction orthogonal to the stretching direction (hereinafter also simply referred to as an orthogonal direction), A structure is known in which the first nonwoven fabric layer and the second nonwoven fabric layer are joined at a sheet joining portion that is intermittently arranged in the orthogonal direction at a position between the elastic members in the orthogonal direction and that is substantially continuous in the stretching direction. Yes. (See Patent Documents 1 to 3)

  On the other hand, in order to mainly improve air permeability, it has been proposed to provide holes in the first nonwoven fabric layer and the second nonwoven fabric layer (see, for example, Patent Documents 4 to 6).

  Among these, the one described in Patent Document 6 is formed by pressure welding in the thickness direction rectangular sheet joints arranged in a matrix at intervals in the expansion and contraction direction and the direction orthogonal thereto, A hole is formed so as to overlap the sheet joining portion. In this case, the part between the sheet | seat junction parts in an expansion-contraction direction swells in the mutually opposite direction, and the wrinkles extended in an orthogonal direction are formed.

  In the thing of patent document 6, since a hole is arrange | positioned only in the valley bottom between ridges, in order to improve air permeability, it is necessary to enlarge a hole. Further, in order to further improve the air permeability, it is necessary to provide a hole in a portion other than the sheet bonding portion, for example, the top of the ridge.

  On the other hand, the method of forming the hole is not particularly limited, but when the hole is formed by punching, waste material is generated. Therefore, the hole is preferably formed by piercing the pin.

  However, when the hole is formed by piercing the pin, the fiber is pushed out to the periphery when the pin is inserted, so that the edge of the hole becomes denser than the periphery. Therefore, when such a hole is formed large at the top of the ridge, the top of the ridge becomes more flat in the portion having the hole, is low and has a long dimension in the expansion / contraction direction, and is sharper in the portion having no hole. The shape is close to the shape, and the shape is high and the size in the expansion / contraction direction is short. That is, the top of the ridge tends to be uneven, and the planar shape also tends to be a cloud shape. On the other hand, if the holes are uniformly reduced, the improvement in air permeability is limited.

JP 2004-229857 A JP 2013-132331 A JP 2014-209773 A Japanese Patent Laying-Open No. 2015-107223 JP-A-2015-128573 Japanese Patent Laying-Open No. 2015-192862 JP 2011-78477 A

  Then, the main subject of this invention is providing the expansion-contraction structure of the disposable wearing article which can make compatible the improvement of air permeability and the maintenance of the favorable external appearance of a bag.

The stretchable structure of the disposable wearing article that has solved the above problems is as follows.
<First aspect>
Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joint portion where the first nonwoven fabric layer and the second nonwoven fabric layer are joined,
In the stretchable structure of the disposable wearing article, at least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
The sheet bonding portion is provided at least in the expansion / contraction direction with an interval between them,
The arrangement of the holes in the stretchable structure is such that the holes provided at the center of the stretchable direction in the sheet joining portion are arranged adjacent to each other in the stretchable direction and the first hole row arranged in the orthogonal direction with an interval. The second hole row in which the holes provided in the central portion between the sheet joint portions are arranged with an interval in the orthogonal direction are alternately repeated with an interval in the expansion and contraction direction,
The expansion / contraction direction dimension of the hole in the first hole row is longer than the expansion / contraction direction dimension of the hole in the second hole row,
A stretchable structure for a disposable wearing article.

(Function and effect)
In the present stretchable structure, since the sheet joining portions are formed at least at intervals in the stretchable direction, air permeability and flexibility in portions other than the holes are ensured. Moreover, in this expansion-contraction structure, the part between the sheet | seat junction parts in an expansion / contraction direction swells in the direction opposite to each other, thereby forming a ridge extending in the orthogonal direction. Moreover, since the 1st hole row is located in a sheet | seat junction part, and the 2nd hole row | line | column is located in the center part between the adjacent sheet junction parts in an expansion-contraction direction, the hole of a 1st hole row is between ridges. The hole of the second hole row is located at the top of the ridge. And in this expansion-contraction structure, the dimension of the hole is not uniform, and the expansion-contraction direction dimension of the hole in the 1st hole row is a thing longer than the expansion-contraction direction dimension of the hole in the 2nd hole row. That is, this stretchable structure is based on improving air permeability by both the first hole row and the second hole row. Here, the size of the first hole row hardly affects the shape of the top of the ridge, whereas the size of the second hole row strongly affects the shape of the top of the ridge. This telescopic structure makes good use of this. In other words, by making the expansion / contraction direction dimensions of the holes of the first hole row larger than the expansion / contraction direction dimensions of the holes of the second hole row, the overall air permeability is further improved, and the improvement of the air permeability is reduced. The appearance of the bag can be intact.

  In addition, "the arrangement | sequence of the hole in an elastic structure" means the arrangement | sequence which match | combined all the holes in a 1st nonwoven fabric layer and a 2nd nonwoven fabric layer. Therefore, for example, when only one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric, it matches the arrangement of the holes in the perforated nonwoven fabric, but both the first nonwoven fabric layer and the second nonwoven fabric layer. In the case of a perforated nonwoven fabric, even if the arrangement of the holes of each nonwoven fabric layer does not satisfy the conditions of this embodiment, the arrangement of all the holes of both nonwoven fabric layers only needs to satisfy the conditions of this embodiment.

<Second aspect>
The expansion / contraction direction dimension of the hole in the first hole row is 1.5 to 3.0 times the expansion / contraction direction dimension of the hole in the second hole row,
The second hole row is located between the adjacent sheet joint portions,
The expansion-contraction structure of the disposable wearing article of a 1st aspect.

(Function and effect)
The expansion / contraction direction dimension of the holes in the first hole row and the expansion / contraction direction dimension of the holes in the second hole row can be determined as appropriate, but in the normal case, it is preferably within the range of this embodiment.

<Third Aspect>
The arrangement of the holes in the stretchable structure is a matrix in which rows of holes that are linearly spaced in the orthogonal direction are repeated at intervals in the stretchable direction,
In the first hole row, the center of the sheet joining portion in the expansion / contraction direction coincides with the center of the hole in the expansion / contraction direction,
In the first hole row, the dimension of the sheet joining portion in the expansion / contraction direction is 1.5 to 2.0 times the dimension of the hole in the expansion / contraction direction,
The interval in the orthogonal direction of the holes in the first hole row and the second hole row is 0.1 to 1.0 times the interval in the expansion / contraction direction of the first hole row and the second hole row. Is,
The elastic structure of the disposable wearing article of the 1st or 2nd aspect.

(Function and effect)
If the holes form a straight line at a narrow interval in the orthogonal direction as in this embodiment, and both side edges of the sheet joint are located in the vicinity of both sides of the hole, along the direction of the line of holes and Since it becomes easy to bend so that the part which has a hole may become a valley bottom, the wrinkle in a perforated nonwoven fabric comes to be formed more beautifully along an orthogonal direction.

<Fourth aspect>
The dimension of the sheet joint portion in the expansion / contraction direction is 0.5 to 4 mm,
An interval in the expansion / contraction direction of the sheet joint portion is 2.5 to 10.0 mm,
The holes in the first hole row and the second hole row have a dimension in the expansion / contraction direction of 0.3 to 3.0 mm, and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
The interval in the orthogonal direction of the holes in the first hole row and the second hole row is 1.0 to 5.0 mm,
The distance between the first hole row and the second hole row in the expansion / contraction direction is 2.5 to 10.0 mm,
The interval between the elastic members in the orthogonal direction is 5 to 10 mm.
The elastic structure of the disposable wearing article of the third aspect.

(Function and effect)
Although arrangement | positioning of a hole, a sheet | seat junction part, and an elastic member can be determined suitably, it is preferable to be in the range of this aspect.

<Fifth aspect>
The sheet joining portion is obtained by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive,
Wherein the first row of holes, a set of the sheet bonding portion for bonding to the nonwoven facing the edge of the hole and the hole is, are aligned at intervals in the perpendicular direction,
The diameter of each hole in the perforated nonwoven fabric decreases as it goes from the opposite side to the facing nonwoven layer side to the facing nonwoven layer side,
The elastic structure of the disposable wearing article of any one aspect of the 1st-4th.

(Function and effect)
Moreover, in this expansion-contraction structure, the part between the sheet | seat junction parts in an expansion / contraction direction swells in the direction opposite to each other, thereby forming a ridge extending in the orthogonal direction. The space | interval part of the orthogonal | vertical direction of a sheet | seat junction part becomes a trough part between ridges and ridges in both the first nonwoven fabric layer and the second nonwoven fabric layer. Here, when the sheet bonded portion is pressure welded in the thickness direction, at the interval portion in the orthogonal direction of the sheet bonded portion, the thickness of the nonwoven fabric layer is restored from the edge of the sheet bonded portion, so that the sheet bonded portions are easily swelled in opposite directions. Become. And if the space | interval part of the orthogonal | vertical direction of a sheet | seat junction part becomes easy to swell in this way, it will be difficult to form the wrinkles which were prepared as a whole, such as a wrinkle branching or a peak part of a wrinkle becoming wide. In order to make this problem difficult to occur, it is necessary to make the interval in the orthogonal direction of the sheet joint portion very narrow, but since it is also necessary to pass an elastic member through the interval portion in the orthogonal direction of the sheet joint portion, the manufacture is It becomes extremely difficult.

  On the other hand, when the sheet joint is bonded with a hot melt adhesive, as in the present stretchable structure, the degree of compression at the sheet joint and the other parts hardly changes. Compared with, the space | interval part of the orthogonal | vertical direction of a sheet | seat junction part is hard to swell in the opposite direction.

  In addition, in this stretchable structure, the diameter of each hole in the perforated nonwoven fabric decreases from the opposite side of the opposing nonwoven fabric layer side toward the opposing nonwoven fabric layer side. As described above, when the diameter of the hole is reduced from the opposite side to the opposite nonwoven layer side toward the opposite nonwoven layer side, the surface opposite to the opposite nonwoven layer is valley-folded in the hole and the vicinity thereof. It is easy to break so that it becomes. Here, in the present stretchable structure, since the hole and the sheet joint portion are arranged in the same manner, the interval portion in the orthogonal direction of the sheet joint portion is affected by the holes adjacent to both sides thereof and the vicinity thereof being easily valley-folded, and the same. It becomes easy to bend in the direction. That is, it becomes difficult for the space | interval part of the orthogonal | vertical direction of a sheet | seat junction part to swell in the opposite direction.

  As a result, it becomes difficult for the gap portions in the orthogonal direction of the sheet joint portion to swell in the opposite direction, so that the ridges do not easily branch or the valley portions do not become wide. It becomes easy to form a cocoon. In other words, when forming a ridge that is arranged to some extent, the interval portion in the orthogonal direction of the sheet joining portion can be made wider than in the case of pressure welding, and a more flexible stretchable structure can be achieved. In addition, in the case where the sheet bonding portion is hot melt bonding, there is no problem even if the sheet bonding portion and the elastic member intersect with each other.

  Furthermore, even if the sheet bonding portion is peeled off due to insufficient adhesion or the like, the gap between the sheet bonding portions in the orthogonal direction because the surface opposite to the non-woven fabric layer is likely to be folded at the hole and the vicinity thereof. There is also an advantage that the part is difficult to bulge in the opposite direction.

  The diameter of the hole means a dimension in a direction that passes through the center of gravity of the hole and is orthogonal to the expansion / contraction direction (therefore, the diameter is a circle in the case of an ellipse, and the major axis is an ellipse).

<Sixth aspect>
In the sheet bonding portion, only the annular portion surrounding the hole and including the edge of the hole is bonded to the facing nonwoven fabric layer via the hot melt adhesive.
The elastic structure of the disposable wearing article of the fifth aspect.

(Function and effect)
Thus, by using only the annular portion in the vicinity of the hole as the sheet joint portion, the air permeability and flexibility are improved. Also, even if hot melt adhesive protrudes into the hole, there is no hot melt adhesive in the center of the hole, and the portion having the hole is located at the bottom of the valley between the hot melts. The adhesive is difficult to touch the skin.

<Seventh aspect>
Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the skin side of the wearer is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the porous nonwoven fabric,
The elastic structure of the disposable wearing article according to any one of the first to sixth aspects.

(Function and effect)
By making the nonwoven fabric layer on the skin side a non-porous nonwoven fabric, it is possible to eliminate the influence of the pores on the touch. Moreover, since only one of the first nonwoven fabric layer and the second nonwoven fabric layer has a hole, the skin is not exposed at the time of wearing, and leakage through the hole can be prevented.

<Eighth aspect>
Both the first nonwoven fabric layer and the second nonwoven fabric layer are the perforated nonwoven fabric, and the holes of one perforated nonwoven fabric do not overlap with the holes of the other perforated nonwoven fabric,
The elastic structure of the disposable wearing article according to any one of the first to sixth aspects.

(Function and effect)
In this aspect, by making both the nonwoven fabric layers porous porous fabrics, higher air permeability can be obtained. Moreover, since the hole of one perforated nonwoven fabric and the hole of the other perforated nonwoven fabric do not overlap, skin is not exposed at the time of mounting | wearing, and the leak through a hole can be prevented.

<Ninth aspect>
An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part A side seal part in which both sides of the outer body of the front body and both sides of the outer body of the back body are joined, a waist opening and a pair of left and right leg openings,
The stretchable structure according to any one of the first to eighth aspects, wherein the exterior body in at least one of the front body and the back body spans at least a width direction range corresponding to the portion between the side seal portions in the front-rear direction. Is provided so that the expansion / contraction direction of the expansion / contraction region is the width direction,
A pants-type disposable wearing article characterized by that.

(Function and effect)
The above-described stretchable structure is suitable for an exterior body of a pants-type disposable wearing article.

  According to the present invention, advantages such as improvement in air permeability and maintenance of a good appearance of the bag can be achieved.

It is a top view which shows the inner surface of the underpants type disposable diaper of an expansion | deployment state. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. It is 2-2 sectional drawing of FIG. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. (A) 4-4 sectional drawing of FIG. 1 and (b) 5-5 sectional drawing of FIG. It is a perspective view (hole omitted) of a pants type disposable diaper. It is a top view which shows the outer surface of the interior body of a unfolded state with the outline of an exterior body. It is a top view which shows the outer surface of the underpants type disposable diaper of an unfolded state. (A) 4-4 sectional drawing of FIG. 8 and (b) 5-5 sectional drawing of FIG. It is a top view which shows the example of arrangement | sequence of a hole. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) 6-6 sectional view of FIG. 11, (b) 7-7 sectional view of FIG. 11, (c) sectional view of a portion having a hole and a sheet joint in the contracted state, and (d) sheet in the contracted state It is sectional drawing of the part between junction parts. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) 6-6 cross-sectional view of FIG. 13, (b) 7-7 cross-sectional view of FIG. 13, (c) Cross-sectional view of a portion having a hole and a sheet joint in the contracted state, and (d) In the contracted state It is sectional drawing of the part between sheet | seat junction parts. (A) Cross-sectional view in the front-rear direction in the unfolded state, (b) Cross-sectional view in the width direction in the unfolded state, (c) Cross-sectional view of the portion having the hole and sheet joint in the contracted state, and (d) Sheet joint in the contracted state It is sectional drawing of the part between parts. It is an expanded sectional view of a sheet joined part. It is a top view which expands and shows the principal part of the exterior body of the expansion | deployment state. (A) Front view showing the outer surface of the exterior body in the natural length state, (b) Front view showing the inner surface of the exterior body in the natural length state, (c) Front view showing the outer surface of the exterior body in a state of being stretched to some extent. It is.

  Hereinafter, an example of a pants-type disposable diaper will be described in detail with reference to the accompanying drawings. The dotted pattern in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (Transfer of hot melt adhesive in a relief printing method) or the like, or the fixing portion of the elastic member is formed by application to the outer peripheral surface of the elastic member such as a comb gun or a sheath coating instead of or together with this is there. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), olefin, and polyester / polyamide types, which can be used without any particular limitation. As a joining means for joining the constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

  The pants-type disposable diaper shown in FIGS. 1 to 6 includes a front exterior body 12F that constitutes the front body F, a rear exterior body 12B that constitutes the rear body B, and a rear exterior body from the front exterior body 12F through the crotch portion. An interior body 200 provided inside the exterior bodies 12F and 12B so as to extend to the body 12B. Both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined to form a side seal portion 12A. As a result, the openings formed by the front and rear end portions of the exterior bodies 12F and 12B become the waist openings WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the interior body 200 on both sides in the width direction of the interior body 200. The portions surrounded by the side edges are leg openings LO through which the legs pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior bodies 12F and 12B are portions that support the interior body 200 with respect to the wearer's body. The symbol Y in the figure indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X in the unfolded state. The full width of the diaper is shown.

  The pants-type disposable diaper includes a waist region T defined as a front-rear direction range (a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a portion that forms the leg opening LO. An intermediate region L defined as a front-rear direction range (between a front-rear direction region having the side seal portion 12A of the front body F and a front-rear direction region having the side seal portion 12A of the rear body B). The waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, in the case where the waist region WO has a boundary where the stretching stress in the width direction WD changes (for example, the thickness of the elastic member or the elongation rate changes), the waist opening WO side is more waist-like than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist portion W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(Inner / outer joint)
The fixing of the inner body 200 to the outer bodies 12F and 12B is not particularly limited, and can be performed by, for example, a hot melt adhesive. In the illustrated example, the inner surface of the exterior body 12F, 12B is applied to the back surface of the interior body 200, that is, the back surface of the liquid-impermeable sheet 11 in this case and the hot melt adhesive applied to the root portion 65 of the rising gather 60. Is fixed. The inner / outer joint part 201 that fixes the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire region where both overlap, for example, the inner body 200 may be provided in a portion excluding both ends in the width direction. it can.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a rising gather 60 that extends from both sides of the interior body 200 so as to contact the legs of the wearer in order to prevent excrement from leaking to both sides of the interior body 200.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

  The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  Both side portions of the top sheet 30 may be folded back to the back side at the side edge of the absorbent element 50, or may be projected to the side from the side edge of the absorbent element 50 without being folded back.

  The top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional deviation with respect to the back side member. desirable. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance by the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be in a state of being. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond nonwoven fabric, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

  The intermediate sheet 40 may be fixed to a member adjacent to the back side by a bonding means by material welding such as heat sealing or ultrasonic sealing, or a hot melt adhesive for the purpose of preventing positional displacement with respect to the back side member. desirable. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorbent body 56 with a hot melt adhesive applied to the back surface thereof.

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. The liquid-impermeable sheet 11 is preferably made of a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using microdenier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as coating with a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 to form the side surface of the top sheet 30 of the absorbent element 50. It can also extend to both sides. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

(Get up gather)
The rising gather 60 is for preventing side leakage, extends across the entire front-rear direction LD along both side portions of the interior body 200, and stands up from the side of the interior body 200 to the front side. The rising gather 60 in the illustrated example is such that the base side portion rises obliquely toward the center in the width direction, and the tip side portion rises obliquely outward in the width direction from the intermediate portion, but is not limited thereto. However, it is possible to make appropriate changes such as a configuration in which the whole stands up in the center in the width direction.

  More specifically, the rising gather 60 in the illustrated example folds the belt-shaped gathered nonwoven fabric 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD at the tip portion and folded in two. In addition to overlapping, a plurality of elongated gather elastic members 63 are fixed along the longitudinal direction and spaced apart in the width direction WD between the folded portion and the sheet in the vicinity thereof. The base end portion (the end portion on the side opposite to the sheet folding portion in the width direction WD) of the rising gather 60 opposite to the front end portion is fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the interior body 200. A portion 65 other than the root portion 65 is a main body portion 66 (a portion on the folded portion side) extending from the root portion 65. The main body portion 66 includes a root side portion extending toward the center in the width direction and a tip side portion that is folded back at the tip of the root side portion and extends outward in the width direction. This form is a surface contact type rising gather 60, but a line contact type rising gather 60 that is not folded outward in the width direction can also be used. And while the both ends of the front-back direction among the main body parts 66 are set to the fall-down part 67 fixed with respect to the side part surface of the top sheet 30 in a lying state, the front-back direction intermediate part located between these is not fixed. The gather elastic member 63 along the front-rear direction LD is fixed in an extended state to at least the tip of the free portion 68.

  In the rising gather 60 configured as described above, the contraction force of the gather elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the both ends of the main body portion 66 are fixed so as not to stand up. On the other hand, since there is a non-fixed free portion 68 between them, only the free portion 68 stands up so as to abut on the body side as indicated by an arrow in FIG. In particular, when the root portion 65 is positioned on the back side of the interior body 200, the free portion 68 stands up so as to open outward in the width direction at and around the crotch portion, so that the rising gather 60 abuts on the surface around the legs. As a result, the fit is improved.

(Absorption element)
Although the absorption element 50 is not specifically limited, In this example, it has the absorber 56 and the packaging sheet 58 which wraps this absorber 56 whole. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may be rectangular, but as shown in FIG. 7, the absorber 56 includes a front end portion, a rear end portion, and a constricted portion 56 </ b> N that is located between these and narrower than the front end portion and the rear end portion. The hourglass shape is preferred because the fit of the absorber 56 and the rising gather 60 around the legs is improved.

  Further, the size of the absorbent body 56 can be appropriately determined as long as it extends to the front, rear, left, and right of the urination port position, but preferably extends to the peripheral portion of the interior body 200 or the vicinity thereof in the front-rear direction LD and the width direction WD. . Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used in this type of disposable diaper can be used as they are.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² .

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edge portions protrude from the front and rear of the absorbent body 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
The exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B. The front exterior body 12F and the rear exterior body 12B Are not continuous on the crotch side and are spaced apart in the front-rear direction LD (exterior two-split type). This separation distance 12d can be, for example, about 40 to 60% of the total length Y. Moreover, as shown in FIG.8 and FIG.9, the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B (exterior integral type).

  In the exterior two-divided type pants-type disposable diaper, since the interior body 200 is exposed between the front exterior body 12F and the rear exterior body 12B, the liquid-impermeable sheet 11 is not exposed on the back surface of the interior body 200. The cover nonwoven fabric 20 covering the back surface of the interior body 200 is preferably provided between the front exterior body 12F and the interior body 200 and between the rear exterior body 12B and the interior body 200. The material of the cover nonwoven fabric 20 is not particularly limited. For example, the same material as the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H of the outer package 12 (a porous nonwoven fabric layer or a nonporous nonwoven fabric layer described later) may be used. . The front-rear direction range of the cover nonwoven fabric 20 is not particularly limited as long as it has portions overlapping the front exterior body 12F and the rear exterior body 12B, and extends in the front-rear direction LD over the entire front end to rear end of the interior body 200. As shown in FIG. 7, the intermediate position in the front-rear direction of the region where the rear exterior body 12B and the interior body 200 overlap from the front-rear direction intermediate position of the region where the front exterior body 12F and the interior body 200 overlap. It may extend in the front-rear direction LD.

  The exterior bodies 12 </ b> F and 12 </ b> B have a waistline portion that is a front-rear direction range corresponding to the waistline region T. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion C that extends from the waist region T to the intermediate region L side. is doing. Although not shown, the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B. Further, in the illustrated example, the lower edge of the collar cover portion C is formed in a straight line shape along the width direction WD, similarly to the lower edge of the front exterior body 12F. It can also be a curve that becomes.

  As shown in FIGS. 2 to 5, the exterior bodies 12 </ b> F and 12 </ b> B are formed with the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H. Needless to say, either the outer nonwoven fabric layer 12S or the inner nonwoven fabric layer 12H corresponds to the first nonwoven fabric layer of the present invention, and the other corresponds to the second nonwoven fabric layer of the present invention. As shown in FIG. 5, the nonwoven fabric layer 12H is formed by folding one sheet material so that the crease is positioned on the waist opening side, and bonding two sheet materials together as shown in FIG. It can also be formed. Further, the innermost portion 12r of these sheet materials can be extended to the end of the interior body 200 on the waist opening WO side (see the example in FIG. 9). Further, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be formed of a sheet material that is partially different from the other portions.

  As constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (including single-component fibers and composite fibers such as core sheaths) In addition, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and the like can be selected without particular limitation, and these can also be used as a mixture. In order to increase the flexibility of the nonwoven fabric layers 12S and 12H, it is preferable that the constituent fibers are crimped fibers. Further, the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H may be hydrophilic fibers (including hydrophobic fibers made hydrophilic by a hydrophilizing agent) or hydrophobic fibers or water repellent fibers (water repellent fibers). (Including water-repellent fibers made water-repellent by an agent). Nonwoven fabrics are generally short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punches, depending on fiber length, sheet formation method, fiber bonding method, and laminated structure. These are classified into non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics with a melt-blown layer sandwiched between spunbond layers, SMMS non-woven fabrics, etc.). Can do.

Although the fineness and the basis weight of the constituent fibers of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H can be determined as appropriate, they are preferably about 1.8 to 6.0 dtex and about 10 to 30 g / m ² , respectively.

(About perforated nonwoven fabric)
As shown in FIGS. 2, 8, 11, and 12, at least one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H is a perforated nonwoven fabric in which holes 14 penetrating in the thickness direction are scattered. As shown in FIGS. 11 and 12, when the inner nonwoven fabric layer 12H on the skin side of the wearer is a non-porous nonwoven fabric and the outer nonwoven fabric layer 12S is a porous nonwoven fabric, the influence on the touch of the holes 14 is eliminated. Can do. Moreover, since the hole 14 is provided in only one of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. Although not shown, the inner nonwoven fabric layer 12H on the skin side of the wearer may be a perforated nonwoven fabric, and the outer nonwoven fabric layer 12S may be a nonporous nonwoven fabric. As shown in FIG.13 and FIG.14, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap. A structure is also preferable. In this case, higher air permeability can be obtained by making both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H porous. Moreover, since the hole 14 of one perforated nonwoven fabric and the hole 14 of the other perforated nonwoven fabric do not overlap, the skin is not exposed at the time of wearing, and leakage through the hole 14 can be prevented. As shown in FIG. 15, both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, and the holes 14 of one perforated nonwoven fabric and the holes 14 of the other perforated nonwoven fabric are completely or partially. May overlap. In addition, although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, in most cases (for example, an area of 50% or more), the holes 14 of one perforated nonwoven fabric and the other perforated nonwoven fabric are formed. Although the hole 14 of the porous nonwoven fabric does not overlap, in some cases, the hole 14 of one porous nonwoven fabric and the hole 14 of the other porous nonwoven fabric may overlap.

  The planar shape (opening shape) of each hole 14 can be determined as appropriate. The hole 14 has a long hole shape as shown in FIGS. 10 (a) and 10 (b), a perfect circle as shown in FIG. 10 (e), an ellipse, a triangle and a rectangle as shown in FIG. 10 (d). , Polygons such as rhombuses, stars, clouds, etc. As shown in FIG. 10C, holes having different shapes may be mixed. The dimension of each hole 14 is not particularly limited, but the dimension 14L in the orthogonal direction XD (the dimension of the longest part) is preferably 0.3 to 5.0 mm, particularly preferably 0.6 to 2.0 mm, and the width direction. The WD dimension (longest part dimension) 14W is preferably 0.3 to 3.0 mm, particularly preferably 0.4 to 1.5 mm. When the shape of the hole 14 is a long shape in one direction such as a long hole shape, an ellipse shape, a rectangular shape, a rhombus shape, etc. (a shape in which the total length in one direction is longer than the total length in the direction perpendicular thereto), the dimension in the longitudinal direction It is preferable that (the dimension of the longest part) is 1.2 to 2.5 times the dimension (the dimension of the longest part) in the direction orthogonal thereto. Moreover, when the shape of the hole 14 is long in one direction, the longitudinal direction of the hole 14 is preferably the front-rear direction LD, but may be the width direction WD or an oblique direction.

Although individual area and the area ratio of the holes 14 may be appropriately determined, it is preferable that the area is 0.1~2.7mm ² (especially 0.1 to 1.0 mm ²⁾ about, the area ratio 1. It is preferably about 0 to 15.0% (particularly 5.0 to 10.0%).

  The planar arrangement of the holes 14 in one perforated nonwoven fabric is not particularly limited. Thus, for example, although not shown, when both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are perforated nonwoven fabrics, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H have at least one of the size, shape, and arrangement of the holes 14. May be different.

  On the other hand, the planar arrangement of the holes 14 obtained by combining all the holes 14 in the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H (that is, when all the holes 14 are projected onto a plane) is the expansion / contraction direction ED in the sheet bonding portion 70 described later. The hole 14 provided in the central portion between the first hole row 91 in which the holes 14 provided in the central portion are arranged at intervals in the orthogonal direction XD and the adjacent sheet joining portions 70 in the expansion / contraction direction ED is the orthogonal direction As long as the second hole rows 92 arranged at intervals in XD are alternately repeated at intervals in the expansion / contraction direction ED, it can be determined as appropriate. For example, as shown in FIGS. 10A, 10C, and 10D, the arrangement of all the holes 14 is such that the rows of the holes 14 arranged linearly at predetermined intervals in the orthogonal direction XD are arranged in the expansion / contraction direction ED. It is preferable that the matrix is repeated at a predetermined interval. In this case, as shown in FIG. 10A, the interval 14x in the expansion / contraction direction ED between the first hole row 91 and the second hole row 92 is equal to the orthogonal direction XD of the holes 14 in the first hole row 91. In addition to the arrangement shorter than the interval 91y, as shown in FIG. 10C, the interval 14x in the expansion / contraction direction ED between the first hole row 91 and the second hole row 92, and the first hole row 91 As shown in FIG. 10 (d), an interval 14x in the expansion / contraction direction ED between the first hole row 91 and the second hole row 92 is equal to the first The arrangement can be longer than the interval 91 y in the orthogonal direction XD of the holes 14 in one hole row 91. Further, as shown in FIGS. 10B and 10E, the position of the hole 14 in the orthogonal direction XD in the first hole array 91 and the position of the hole 14 in the orthogonal direction XD in the second hole array 92 are shifted. May be. In addition, as shown in FIG. 10 (f), the holes 14 may be arranged in a wavy line having a center line along the orthogonal direction as long as the adjacent hole rows 91 and 92 have a portion continuous in the orthogonal direction XD. The row of the holes 14 arranged at intervals in the direction orthogonal to the expansion / contraction direction ED is included in the arrangement of the holes 14 arranged at intervals in the expansion / contraction direction ED.

  The orthogonal interval 91y between the holes 14 in the first hole row 91 and the expansion / contraction direction interval 14x between the first hole row 91 and the second hole row 92 may be constant or may vary. Although these can be determined as appropriate, in consideration of air permeability, the orthogonal interval 91y of the holes 14 in the first hole row 91 is within a range of 0.9 to 8.0 mm, particularly 1.0 to 3.0 mm. Desirably, the distance 14x between the first hole row 91 and the second hole row 92 in the expansion / contraction direction is preferably 2.0 to 8.0 mm, particularly 2.0 to 5.0 mm. In addition, the orthogonal interval 92 y of the holes 14 in the second hole array 92 is preferably 1.0 to 3.0 times the orthogonal interval 91 y of the holes 14 in the first hole array 91.

  The cross-sectional shape of the hole 14 is not particularly limited. For example, even if the hole 14 is a punched type hole whose periphery is formed by a cut end of the fiber, the hole 14 has almost no cut end of the fiber, and a pin is inserted between the fibers to be expanded. It may be a non-punched type hole (having a high fiber density at the edge). As shown in FIG. 16 (d), the punched-type hole has a diameter that decreases as it goes toward the middle in the thickness direction, although it is not shown, it decreases as it goes toward one side in the thickness direction. May be.

  The non-punched hole 14 is such that the diameter of the hole 14 decreases from the pin insertion side toward the opposite side. This includes a case where the diameter of the hole 14 continues to decrease over the entire thickness direction of the nonwoven fabric layer, and a case where the decrease in the diameter of the hole 14 almost disappears in the middle of the thickness direction. In such a non-punched hole, as shown in FIGS. 16 (a) and 16 (c), a fiber is pushed out to the edge of the hole 14 on the side opposite to the pin insertion side and pushed out to the side opposite to the pin insertion side. The part (burr) 14e is formed, and the protrusion 14e is not formed on the pin insertion side, and the fiber is inserted into the edge of the hole 14 on the side opposite to the pin insertion side as shown in FIG. The protrusion 14e pushed out to the opposite side is formed, and the pin insertion side includes the protrusion 14e formed by pushing out the fiber to the pin insertion side. Further, in the former type of hole 14, the protrusion 14 e has a substantially uniform height 14 h as shown in FIG. 16A, and the protrusion 14 e as shown in FIG. This includes a facing portion having the highest protruding height 14i and a facing portion facing in a direction perpendicular to the protruding portion and having the lowest protruding height 14j. Although it is desirable that the protruding portion 14e has a cylindrical shape continuously in the circumferential direction of the hole, the protruding portion 14e of a part or all of the holes 14 is formed only in a part of the circumferential direction of the hole 14. Also good. The protruding heights 14h, 14i, and 14j (apparent height in a state where no pressure is measured using an optical microscope) is preferably about 0.2 to 1.2 mm. The highest protrusion height 14i in the protrusion 14e is preferably about 1.1 to 1.4 times the lowest protrusion height 14j. The protruding height of the protruding portion 14 e may change in the circumferential direction of the hole 14.

  For example, when a hole 14 having a long shape in one direction as shown in FIGS. 10A, 10B, and 10D is formed by inserting a pin, fibers at the edge of the hole 14 are retracted outward or vertically. A protruding portion (burr) 14e is formed in which the protruding height i of the opposing portion in the longitudinal direction of the hole 14 is higher than the protruding height j of the opposing portion in the direction orthogonal to the longitudinal direction. The protruding portion 14e of the hole 14 may have a fiber density that is lower than that of the surrounding portion, but is preferably the same or higher.

The fineness, basis weight and thickness of the constituent fibers of the perforated nonwoven fabric can be determined as appropriate, but in the normal case, about 1.8 to 6.0 dtex, about 15 to 25 g / m ^{2 and} about 0.1 to 1.3 mm, respectively. Is preferable. Further, the MD softness of the perforated nonwoven fabric (width direction) is preferably 35 to 100 mm, particularly 40 to 70 mm in a non-porous state before perforation, and 10 to 50 mm in a state after perforation. In particular, the thickness is preferably 15 to 40 mm.

(Elastic area)
In the exterior bodies 12F and 12B, an elongated elastic member 19 is provided between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H, and an expansion / contraction region A2 is formed that elastically expands and contracts in the width direction WD as the elastic member 19 expands and contracts. ing. That is, in the stretchable region A2, in the natural length state, the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H contract with the contraction of the elastic member and have a large number of wrinkles. Moreover, if this expansion-contraction area | region A2 is extended | stretched in the width direction WD, it will extend | stretch to the predetermined | prescribed expansion | extension rate which the outer side nonwoven fabric layer 12S and the inner side nonwoven fabric layer 12H extend completely. The elastic member 19 can be used in any shape, e.g., a thread shape, a string shape, and a belt shape, as long as it is elongated. The elastic member 19 may be made of synthetic rubber or natural rubber.

  As shown in FIGS. 11 and 13, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H at least at both ends in the stretching direction ED in the stretching region A2. The fixing means for the elastic member 19 is not particularly limited, but it is preferable to use the hot melt adhesive 19H. As shown in FIG. 11, one preferred form is that after hot melt adhesive 19H is intermittently applied to the outer peripheral surfaces of both ends in the expansion / contraction direction ED of the elastic member 19 by application means such as a comb gun or a sure wrap nozzle. The elastic member 19 is sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H via the hot melt adhesive 19H only at both ends in the stretching direction ED in the stretchable region. Although a simpler form is not shown, after the hot melt adhesive is continuously applied to the outer peripheral surface of the elastic member 19 by application means such as a comb gun or a sure wrap nozzle, the elastic member 19 is applied to the outer nonwoven fabric layer 12S and the inner side. It is sandwiched between the nonwoven fabric layers 12H. In this case, the elastic member 19 is fixed to the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the entire longitudinal direction as well as both ends in the stretching direction ED in the stretchable region at the arrangement site. As another form, as shown in FIG. 13, hot melt adhesive 19 </ b> H is applied to the arrangement positions of both ends of the elastic member 19 in the expansion / contraction direction ED on at least one facing surface of the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H. After the application, an elastic member can be sandwiched between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. In this case, the hot melt adhesive 19H may be continuous in the orthogonal direction XD as in the illustrated example, or may be intermittently disposed in the orthogonal direction XD although not illustrated. Further, in these cases, the continuous portion of the hot melt adhesive 19H may extend over a plurality of elastic members as in the illustrated example.

In the case of a pants-type disposable diaper such as the illustrated example, it is desirable to provide the elastic member 19, that is, the stretchable region at the following site. That is, a plurality of waist elastic members 17 are spaced in the front-rear direction so as to be continuous over the entire width direction WD between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist portion W of the exterior bodies 12F and 12B. Attached. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the waist lower part U among the waist part elastic members 17, you may overlap with the interior body 200 or the width direction center which overlaps with the interior body 200 You may provide each in the width direction both sides except a part. The waist elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm approximately ²⁾ is preferably provided about 3 to 22 present at intervals of 4 to 12 mm, which by extension ratio in the width direction WD of the waist portion W is 150% to 400%, especially at about 220 to 320 percent Preferably there is. Further, the waist portion W does not need to use the same thickness waist portion elastic member 17 in all of the front-rear direction LD or have the same elongation rate. The thickness and elongation rate may be different.

  Further, a plurality of waist lower part elastic members 15 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the waist lower part U of the exterior bodies 12F and 12B. It has been.

The waist lower part elastic member 15 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 1 to 15 mm, particularly preferably to dispose 5-30 present at intervals of 3 to 8 mm, this elongation in the width direction WD of the waist lower portion U by 200 to 350%, in particular It is preferably about 240 to 300%.

  Further, a plurality of cover elastic members 16 made of an elongated elastic member are attached at intervals in the front-rear direction between the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H in the buttock cover portion C of the rear exterior body 12B. ing.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1.0 mm. ^It is preferable that about 2 to 10 thread rubbers are provided at intervals of 5 to 40 mm, particularly 5 to 20 mm, and the elongation ratio of the cover portion in the width direction WD is 150 to 300%, particularly 180 to 260. % Is preferred.

  In the case of providing a groin cover portion on the front exterior body 12F, a cover portion elastic member can be similarly provided.

(Non-stretchable area)
When the elastic members 15 and 16 are provided in the front-rear direction range having the absorber 56 like the lower waist portion U and the buttock cover portion C in the illustrated example, a part or all of the elastic members 15 and 16 in the width direction WD of the absorber 56. In order to prevent shrinkage, the intermediate in the width direction (preferably including the entire inner / outer joint portion 201) including part or all of the portion overlapping the absorber 56 and the width direction WD is defined as the non-stretchable region A1, and the width direction Both sides are taken as the stretchable area A2. The waist portion W is preferably the stretchable region A2 over the entire width direction WD, but similarly to the waist lower portion U, a non-stretchable region A1 may be provided in the middle in the width direction.

  The stretchable region A2 and the non-stretchable region A1 supply the elastic members 15 and 16 between the inner nonwoven fabric layer 12H and the outer nonwoven fabric layer 12S, and the elastic members 15 and 16 are at least both ends in the stretchable direction ED in the stretchable region A2. In the region that becomes the non-stretchable region A1, the elastic members 15 and 16 are pressed and applied at one place in the middle of the width direction in the region that becomes the non-stretchable region A1. It can be constructed by cutting by heating, or by cutting almost the entire elastic members 15 and 16 finely by pressurization and heating, leaving the stretchability in the stretchable region A2 and killing the stretchability in the non-stretchable region A1. . In the former case, as shown in FIG. 4, the non-stretchable region A1 has an outer nonwoven fabric in a state in which the uncut stretched region A2 is continuously cut from the elastic members 15 and 16 of the stretchable region A2 to the natural length alone as the unnecessary elastic member 18. In the latter case, it remains between the layer 12S and the inner nonwoven fabric layer 12H. Although not shown in the drawing, the cut residue continuous from the elastic members 15 and 16 in the elastic region A2 and the elastic members 15 and 16 in both elastic regions A2 are continuous. The cut piece of the elastic member that is not left is left between the outer nonwoven fabric layer 12 </ b> S and the inner nonwoven fabric layer 12 </ b> H in a state where the cut piece of the elastic member is contracted to the natural length alone as an unnecessary elastic member.

(Junction structure of outer nonwoven fabric layer and inner nonwoven fabric layer)
As shown in FIGS. 11 to 15, the sheet bonding portion 70 is repeatedly provided in the expansion / contraction region A <b> 2 at least in the expansion / contraction direction ED. Therefore, air permeability and flexibility in portions other than the holes 14 are also ensured. The sheet bonding portion 70 is continuous in the orthogonal direction XD so as to pass through the plurality of holes 14 as in the example shown in FIG. 17 (in addition to the case where the sheet bonding portion 70 is continuous over the entire orthogonal direction XD of the stretchable region A2, (In some cases, only a part of the intersecting range may be continuous), or in the orthogonal direction XD as well as the expansion / contraction direction ED as in the example shown in FIG. As shown in the figure, only one hole 14 may be provided). In any case, in the present stretchable structure, as shown in FIGS. 12 (c) (d), 14 (c) (d), and 15 (c) (d), the outer nonwoven fabric is contracted as the elastic member 19 contracts. The portions located between the sheet joining portions 70 in the layer 12S and the inner nonwoven fabric layer 12H are contracted and swelled in opposite directions to form the ridge 80. As shown in FIGS. 18A and 18B, the flange 80 extends in the orthogonal direction XD.

  The dimensions and the like of the sheet bonding portion 70 can be determined as appropriate. In a normal case, the dimension 70W in the expansion / contraction direction ED of the sheet bonding portion 70 is 0.5 to 4 mm, and the interval 70x of the expansion / contraction direction ED of the sheet bonding portion 70 is. Is preferably 2.5 to 10.0 mm. Further, as in the example shown in FIGS. 11 and 13, when the sheet bonding portion 70 is provided not only in the expansion / contraction direction ED but also in the orthogonal direction XD, the sheet bonding portion 70 is arranged in the orthogonal direction XD. The dimension 70L is preferably 0.5 to 4 mm, and the interval 70y in the orthogonal direction XD of the sheet bonding portion 70 is preferably 1.0 to 5.0 mm.

  The sheet joining portion 70 in the illustrated example is a portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are joined via the hot melt adhesive 14H welding, but the portion where the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H are welded. It may be.

  As described above, the arrangement of the holes 14 in the expansion / contraction structure is such that the holes 14 provided at the center of the expansion / contraction direction ED in the sheet joining portion 70 are arranged in the orthogonal direction XD with an interval in the orthogonal direction XD, and the expansion / contraction direction. A second hole array 92 in which holes 14 provided in the central portion between adjacent sheet joining portions 70 in the ED are arranged at intervals in the orthogonal direction XD are alternately repeated at intervals in the expansion / contraction direction ED. It has become. Therefore, in the present telescopic structure, the first hole row 91 is located at the sheet joining portion 70, and the second hole row 92 is located at the central portion between the adjacent sheet joining portions 70 in the stretching direction ED. The hole 14 of the first hole row 91 is located at the bottom of the valley between the ridges 80, and the hole 14 of the second hole row 92 is located at the top of the ridge 80. Therefore, in a state of contracting to some extent, such as a natural length state, the second hole row 92 is exposed at the top of the ridge 80 as shown in FIG. The hole row 91 is hidden. Further, in a state of being extended to some extent as in the mounted state or the like, as shown in FIG. 18 (c), the interval between the flanges 80 is opened, and the first hole row 91 is also exposed.

  And in this expansion-contraction structure, the dimension of the hole 14 is not uniform, and the expansion-contraction direction dimension 91W of the hole 14 in the first hole array 91 is larger than the expansion-contraction direction dimension 92W of the hole 14 in the second hole array 92. It has been long. That is, the present telescopic structure is basically to improve the air permeability by both the first hole row 91 and the second hole row 92. Here, the size of the first hole row 91 hardly influences the shape of the top portion of the ridge 80, whereas the size of the second hole row 92 strongly affects the shape of the top portion of the ridge 80. . This telescopic structure makes good use of this. That is, by making the expansion / contraction direction dimension 91W of the hole 14 of the first hole row 91 larger than the expansion / contraction direction dimension 92W of the hole 14 of the second hole row 92, the overall air permeability is further improved. Although the air permeability is improved, the outer appearance of the ridge 80 can be kept intact.

  The expansion / contraction direction dimension 91W of the hole 14 in the first hole row 91 and the expansion / contraction direction dimension 92W of the hole 14 in the second hole row 92 can be determined as appropriate, but in the normal case, the hole in the first hole row 91 The expansion / contraction direction dimension 91W of 14 is 1.5 to 3.0 times the expansion / contraction direction dimension 92W of the hole 14 in the second hole row 92, and the second hole row 92 is located between adjacent sheet joints 70. It is preferable to be located at.

  Although the arrangement of the holes 14 is not limited, in the first hole row 91, the sheet joint portion 70 and the holes 14 are arranged in combination. The arrangement of the sheet bonding portion 70 affects the shape of the flange 80. Therefore, in consideration of these, the arrangement of the holes 14 when all the holes 14 are combined is a matrix in which a row of holes 14 linearly spaced in the orthogonal direction XD repeats with an interval in the expansion / contraction direction ED. Yes, in the first hole row 91, when the center of the expansion / contraction direction ED of the sheet joint portion 70 coincides with the center of the expansion / contraction direction ED of the hole 14, the flange extends linearly along the orthogonal direction XD, It is preferable because it has a clean appearance. Here, the dimension 70W in the expansion / contraction direction ED of the sheet joining portion 70 is 1.5 to 2.0 times the dimension 14W in the expansion / contraction direction ED of the hole 14 in the first hole array 91. The interval 14y in the orthogonal direction XD of the holes 14 in the second hole row 92 is 0.1 to 1.0 times the interval 14x in the expansion / contraction direction ED of the first hole row 91 and the second hole row 92. And more preferable. In this way, when the holes 14 form a straight line at a narrow interval in the orthogonal direction XD, and both side edges of the sheet joint portion 70 are located in the vicinity of both sides of the hole 14, Since it becomes easy to bend so that the part which has the hole 14 may become a valley bottom along, the wrinkle in a perforated nonwoven fabric comes to be formed more beautifully along the orthogonal direction XD.

The specific dimensions and arrangement of the holes 14 and the arrangement of the elastic members in this matrix arrangement can be determined as appropriate, but are particularly preferably within the following ranges.
The dimension 70W of the expansion / contraction direction ED of the sheet joining portion 70 is 0.5 to 4 mm,
The interval 70x in the expansion / contraction direction ED of the sheet joining portion 70 is 2.5 to 10.0 mm,
Dimension 91W in the expansion / contraction direction ED of the holes 14 in the first hole row 91: 0.3 to 3.0 mm
Dimension 92W of expansion / contraction direction ED of hole 14 in second hole row 92: 0.1 to 2.0 mm
Dimension 91L in the orthogonal direction XD of the holes 14 in the first hole row 91: 0.3 to 5.0 mm
Dimension 92L in the orthogonal direction XD of the holes 14 in the second hole row 92: 0.1 to 5.0 mm
Spaces 91y, 92y in the orthogonal direction XD of the holes 14 in the first hole row 91 and the second hole row 92: 1.0 to 5.0 mm
Spacing 91x and 92x in the expansion / contraction direction ED of the first hole row 91 and the second hole row 92: 2.5 to 10.0 mm
Spacing between elastic members 19 in the orthogonal direction XD: 5 to 10 mm

The sheet bonding portion 70 not only stretch direction ED, if provided also at intervals in the orthogonal direction XD, the first row of holes 91, the sheet bonding portion for bonding to the nonwoven facing edges of the hole 14 and the hole 14 It is preferable that a pair with 70 is arranged at intervals in the orthogonal direction XD. As described above, in this stretchable structure, as shown in FIGS. 12 (c) (d), 14 (c) (d), and 15 (c) (d), in a natural length or in a mounted state contracted to some extent. In addition, as the elastic member 19 contracts, the portions of the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H that are located between the sheet joining portions 70 contract, and bulge in opposite directions to form wrinkles. This ridge extends in the orthogonal direction XD. As shown in FIGS. 12 (d), 14 (d), and 15 (d), the interval portion in the orthogonal direction XD of the sheet joining portion 70 is ridges 80 and 襞 80 in both the outer nonwoven fabric layer 12S and the inner nonwoven fabric layer 12H. It becomes a valley between. Here, when the sheet bonding portion 70 is bonded by the hot melt adhesive 14H, the degree of compression in the sheet bonding portion 70 and other portions is almost the same, so that the sheet bonding is compared with the case of pressure welding. The interval portion in the orthogonal direction XD of the portion 70 is unlikely to swell in the opposite direction. Moreover, in this stretchable structure, the diameter of each hole 14 in the perforated nonwoven fabric decreases from the opposite side of the opposing nonwoven fabric 150 layer side toward the opposing nonwoven fabric layer side. Thus, when the diameter of the hole 14 becomes smaller as it goes from the opposite side to the opposing nonwoven fabric layer side to the opposing nonwoven fabric layer side, the surface opposite to the opposing nonwoven fabric layer is present in the hole 14 and its vicinity. It is easy to fold like a valley fold. Here, since the hole 14 and the sheet joint portion 70 are arranged in the same manner in this stretchable structure, the gap portion in the orthogonal direction XD of the sheet joint portion 70 is likely to be valley-folded in the hole 14 adjacent to both sides and the vicinity thereof. Affected and easy to break in the same direction. That is, the interval portion in the orthogonal direction XD of the sheet bonding portion 70 is less likely to bulge in the opposite direction. This is the same even if the sheet joint is peeled off due to insufficient adhesion or the like. As a result, the interval portion in the orthogonal direction XD of the sheet joining portion 70 is less likely to bulge in the opposite direction, and as a result, the ridge 80 is less likely to branch or the valley portion is partially widened. It is easy to form a regular ridge 80 extending along. In other words, when forming the ridge 80 that is arranged to some extent, the interval portion in the orthogonal direction XD of the sheet joining portion 70 can be made wider than in the case of pressure welding, and a more flexible stretchable structure can be achieved. . In addition, in the case where the sheet bonding portion 70 is hot melt bonding, there is no problem even if the sheet bonding portion 70 and the elastic member 19 intersect with each other, so that the manufacture is facilitated.

  As shown in FIG. 16 (a), a typical adhesion state in the case where the edge of the hole 14 is bonded to the opposing nonwoven fabric is such that the entire portion overlapping the hole 14 and the edge of the hole 14 are hot melt. A state of being bonded to the facing nonwoven fabric layer 12H through the adhesive 14H, as shown in FIGS. 16B and 16C, only the annular portion surrounding the center of the hole 14 and including the edge of the hole 14 However, the state which is adhere | attached with the nonwoven fabric layer 12H which opposes via the hot-melt-adhesive 14H can be illustrated. As in the latter case, only the annular portion in the vicinity of the hole 14 is used as the sheet joining portion 70, so that air permeability and flexibility are improved. In addition, even if the hot melt adhesive 14H protrudes into the hole 14, the hot melt adhesive 14H does not exist in the center of the hole 14, and the portion having the hole 14 is in the valley bottom between the ridges 80. Therefore, the hot melt adhesive 14H is difficult to touch the skin. In each of the examples shown in FIG. 16, a protruding portion 14e is formed on the facing surface. In the state shown in FIG. 16A, the hot melt adhesive 14H is present on the entire protrusion and the inside thereof, and in the state shown in FIG. 16B, the hot melt adhesive 14H is present only on the protrusion 14e. In the state shown in FIG. 16C, the hot melt adhesive 14H is present on the periphery of the portion overlapping the hole 14 and on the outside of the protrusion 14e.

  Although the hole 14 and the sheet | seat junction part 70 can also be provided only in the expansion-contraction area | region A2, as shown in the example shown in FIG.8 and FIG.9, it can be provided over a wider range area | region including the non-expandable area | region A1.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

  The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.

  -"MD direction" and "CD direction" mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular thereto, and either one is the front-rear direction, and the other Is the width direction. The MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. For example, the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, and the tensile strength ratio in the front-rear direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.

  “Center” with respect to a closed planar shape means the center of gravity in the case of a figure having no center.

  ・ "Front side" means the person near the wearer's skin when wearing a pants-type disposable diaper, and "Back" means the person far from the wearer's skin when wearing a pants-type disposable diaper .

  ・ "Surface" means the surface closer to the wearer's skin when wearing a pants-type disposable diaper, and "Back" refers to the skin of the wearer when wearing a pants-type disposable diaper. It means the far side.

-“Area ratio” means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (for example, holes) in the target region (for example, non-woven fabric) by the area of the target region. is there. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target region to a size that includes 10 or more target portions and obtain the area ratio. For example, the area ratio of the pores can be measured by the following procedure using, for example, a trade name VHX-1000 of KEYENCE Corporation and measuring conditions 20 times.
(1) Set on a 20x lens and adjust the focus. The position of the nonwoven fabric is adjusted so that the holes are 4 × 6.
(2) Specify the brightness of the hole area and measure the area of the hole.
(3) Click the “Area measurement” color extraction in “Measurement / Comments”. Click on the hole.
(4) Click “Batch measurement”, check “Display measurement result window”, and save as CSV data.

  “Elongation rate” means a value when the natural length is 100%.

  -"Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt% 1.0 g of a superabsorbent polymer is added to 49.0 g of the mixture) and stirred with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

  ・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to a constant weight. Pre-drying refers to making a sample or test piece constant in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. From the test piece in a constant weight state, a sample plate (100 mm × 100 mm) is used to cut a sample having a size of 100 mm × 100 mm. The weight of the sample is measured, multiplied by 100, and the weight per square meter is calculated and used as the basis weight.

-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

  “Bending softness” means “8.21.1 A method (45 ° cantilever method)” of JIS L 1096: 2010 “Fabric and knitted fabric testing method”. When the non-porous nonwoven fabric before punching is not available, the value of the porous nonwoven fabric before punching (non-porous nonwoven fabric) is the same as the non-porous nonwoven fabric (fiber composition, fineness, basis weight, thickness, etc.). Prepare and measure.

  -The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".

  ・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

  -"Developed state" means a state where the plate is flattened without contraction or slack.

  -Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.

  ・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard state (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

  INDUSTRIAL APPLICABILITY The present invention can be used for all disposable wearing articles such as pants-type disposable diapers and tape-type disposable diapers, pad-type disposable diapers, disposable swimwear, diaper covers, sanitary napkins and the like.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12B ... Rear side exterior body, 12F ... Front side exterior body, 12H ... Inner nonwoven fabric layer, 12S ... Outer nonwoven fabric layer, 14 ... Hole, 14e ... Projection, 14H ... hot melt adhesive, 14r ... square, 18 ... unnecessary elastic member, 19 ... elastic member, 20 ... cover nonwoven fabric, 200 ... interior body, 201 ... inner / outer joint, 30 ... top sheet, 40 ... intermediate sheet , 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Gathering, 62 ... Gathered nonwoven fabric, 70 ... Sheet joint, 80 ... Spear, 91 ... First hole row, 92 ... Second hole Row, A1 ... non-stretchable area, A2 ... stretchable area, C ... buttocks cover part, L ... intermediate area, LD ... longitudinal direction, LO ... leg opening, T ... waist circumference area, U ... waist lower part, W ... waist part , WD ... width direction, O ... waist-opening, XD ... the orthogonal direction, ED ... expansion and contraction direction.

Claims (9)

Along the stretch direction, the first nonwoven fabric layer and the second nonwoven fabric layer, which are partly or entirely overlapped, and arranged between the first nonwoven fabric layer and the second nonwoven fabric layer with an interval in the orthogonal direction perpendicular to the stretch direction. A plurality of elongated elastic members extending
The elastic member is fixed to the first nonwoven fabric layer and the second nonwoven fabric layer at least at both ends in the stretchable direction in the stretchable region,
The stretchable region has a sheet joint portion where the first nonwoven fabric layer and the second nonwoven fabric layer are joined,
In the stretchable structure of the disposable wearing article, at least one of the first nonwoven fabric layer and the second nonwoven fabric layer is a perforated nonwoven fabric in which holes penetrating in the thickness direction are arranged.
The sheet bonding portion is provided at least in the expansion / contraction direction with an interval between them,
The arrangement of the holes in the stretchable structure is such that the holes provided at the center of the stretchable direction in the sheet joining portion are arranged adjacent to each other in the stretchable direction and the first hole row arranged in the orthogonal direction with an interval. The second hole row in which the holes provided in the central portion between the sheet joint portions are arranged with an interval in the orthogonal direction are alternately repeated with an interval in the expansion and contraction direction,
The expansion / contraction direction dimension of the hole in the first hole row is longer than the expansion / contraction direction dimension of the hole in the second hole row,
A stretchable structure for a disposable wearing article. The expansion / contraction direction dimension of the hole in the first hole row is 1.5 to 3.0 times the expansion / contraction direction dimension of the hole in the second hole row,
The second hole row is located between the adjacent sheet joint portions,
The elastic structure of the disposable wearing article according to claim 1. The arrangement of the holes in the stretchable structure is a matrix in which rows of holes that are linearly spaced in the orthogonal direction are repeated at intervals in the stretchable direction,
In the first hole row, the center of the sheet joining portion in the expansion / contraction direction coincides with the center of the hole in the expansion / contraction direction,
In the first hole row, the dimension of the sheet joining portion in the expansion / contraction direction is 1.5 to 2.0 times the dimension of the hole in the expansion / contraction direction,
The interval in the orthogonal direction of the holes in the first hole row and the second hole row is 0.1 to 1.0 times the interval in the expansion / contraction direction of the first hole row and the second hole row. Is,
The elastic structure of the disposable wearing article according to claim 1 or 2. The dimension of the sheet joint portion in the expansion / contraction direction is 0.5 to 4 mm,
An interval in the expansion / contraction direction of the sheet joint portion is 2.5 to 10.0 mm,
The holes in the first hole row and the second hole row have a dimension in the expansion / contraction direction of 0.3 to 3.0 mm, and a dimension in the orthogonal direction of 0.3 to 5.0 mm,
The interval in the orthogonal direction of the holes in the first hole row and the second hole row is 1.0 to 5.0 mm,
The distance between the first hole row and the second hole row in the expansion / contraction direction is 2.5 to 10.0 mm,
The interval between the elastic members in the orthogonal direction is 5 to 10 mm.
The elastic structure of the disposable wearing article according to claim 3. The sheet joining portion is obtained by joining the first nonwoven fabric layer and the second nonwoven fabric layer via a hot melt adhesive,
In the first hole row, a set of a hole and a sheet bonding portion that bonds the edge of the hole to the facing nonwoven fabric is arranged with a gap in the orthogonal direction,
The diameter of each hole in the perforated nonwoven fabric decreases as it goes from the opposite side to the facing nonwoven layer side to the facing nonwoven layer side,
The elastic | stretch structure of the disposable wearing article of any one of Claims 1-4. In the sheet bonding portion, only the annular portion surrounding the hole and including the edge of the hole is bonded to the facing nonwoven fabric layer via the hot melt adhesive.
The elastic structure of the disposable wearing article according to claim 5. Of the first nonwoven fabric layer and the second nonwoven fabric layer, the nonwoven fabric layer on the skin side of the wearer is a nonporous nonwoven fabric, and the opposite nonwoven fabric layer is the porous nonwoven fabric,
The elastic | stretch structure of the disposable wearing article of any one of Claims 1-6. Both the first nonwoven fabric layer and the second nonwoven fabric layer are the perforated nonwoven fabric, and the holes of one perforated nonwoven fabric do not overlap with the holes of the other perforated nonwoven fabric,
The elastic | stretch structure of the disposable wearing article of any one of Claims 1-6. An integrated exterior body from the front body to the back body, or an exterior body provided separately for the front body and the back body, and an interior body that is attached to the middle part in the width direction of the exterior body and covers both the front and back of the crotch part A side seal part in which both sides of the outer body of the front body and both sides of the outer body of the back body are joined, a waist opening and a pair of left and right leg openings,
The said exterior body in at least one of the said front body and the back body covers the width direction range corresponding to between the said side seal parts in the partial range of the front-back direction at least, It is any one of Claims 1-8. Equipped with a stretchable structure so that the stretchable direction of the stretchable region is the width direction,
A pants-type disposable wearing article characterized by that.

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