JP7052703B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article.

Absorbent articles such as disposable diapers, absorbent pads (urine pads), and sanitary products are known. The absorbent article is formed of a pulp or a super absorbent polymer (SAP), and includes an absorbent body that absorbs a liquid such as urine or body fluid. Moisture generated from the liquid absorbed by the absorber, the wearer's sweat, or the like tends to stay between the absorbent article and the wearer's skin. This moisture causes discomfort such as stuffiness to the wearer of the absorbent article, and causes a decrease in the wearing feeling of the absorbent article.

Patent Document 1 describes an absorbent article comprising a non-woven fabric in which through holes are formed by a perforating needle in order to obtain air permeability for preventing stuffiness.

Japanese Patent No. 6402817

When a through hole is formed in a non-woven fabric by a perforation needle, the perforation needle is heated to a predetermined temperature, and when the through hole is formed, the thermoplastic resin material contained in the non-woven fabric is heat-deformed to maintain the shape of the through hole. Heat treatment is applied. The non-woven fabric around the heat-treated through hole becomes hard, and when the fiber around the through hole comes into contact with the wearer's skin or the like, the wearer feels uncomfortable and the wearing feeling of the absorbent article deteriorates.

Therefore, an object of the present invention is to provide an absorbent article which can obtain breathability, suppress stuffiness, and do not reduce the wearing feeling.

In order to solve the above problems, in the present invention, the outer edge portion of the through hole formed in the first nonwoven fabric protrudes toward the second nonwoven fabric side, and at least a part of the outer edge portion is joined to the second nonwoven fabric. ing.

In particular, the present invention comprises an absorbent article, a first nonwoven fabric on which a through hole is formed, and a second nonwoven fabric superimposed on the first nonwoven fabric, wherein the outer edge of the through hole is the said. It protrudes toward the second nonwoven fabric side, and at least a part of the outer edge portion is joined to the second nonwoven fabric.

In the above-mentioned absorbent article, the first nonwoven fabric may be arranged closer to the skin of the wearer in the wearing state than the second nonwoven fabric.

In the absorbent article, a plurality of the through holes are formed side by side in one direction, and the second nonwoven fabric extends on the surface side of the second nonwoven fabric facing the first nonwoven fabric with a predetermined width in the one direction and is hot. A joint region coated with melt is formed, and the first nonwoven fabric and the second nonwoven fabric are overlapped with each other so that the positions of the plurality of through holes arranged in one direction and the joint region are aligned with each other. At least a part of the outer edge portion may be joined to the joining region.

The absorbent article comprises a sheet member having the first nonwoven fabric and the second nonwoven fabric, wherein the sheet member is at least a front body area covering the wearer's abdomen or a back body area covering the wearer's back. It may be arranged in any of them.

According to the above-mentioned invention, breathability is obtained and stuffiness is suppressed, and the wearing feeling is not deteriorated.

FIG. 1 is a perspective view of a pants-type disposable diaper according to an embodiment. FIG. 2 is an exploded perspective view of the diaper according to the embodiment. FIG. 3 is a diagram schematically showing a state in which the diaper according to the embodiment is unfolded and stretched. FIG. 4 is a diagram showing the relationship between the distance between the rubber threads and the ventilation path appearing in the waist gather. FIG. 5 is a cross-sectional view of a nonwoven fabric used for the diaper according to the embodiment.

Hereinafter, embodiments of the present invention will be described. The embodiments shown below are examples of embodiments of the present invention, and the technical scope of the present invention is not limited to the following embodiments.

<Embodiment>
FIG. 1 is a perspective view of a pants-type disposable diaper (hereinafter, simply referred to as “diaper”) according to the embodiment. The term for the direction used in the present application means a direction that coincides with the front, back, left, and right of the wearer when the diaper 1 is worn by the wearer. For example, in the present application, the term "left-right direction" means a direction that coincides with the left and right of the wearer of the diaper 1 when worn by the wearer.

In the present embodiment, as an example of the absorbent article, a pants-type disposable diaper having a tubular structure having an opening for the wearer's abdominal circumference and a pair of left and right openings through which the wearer's left and right lower limbs are inserted. However, the “absorbent article” referred to in the present application is not limited to the pants-type disposable diaper. The "absorbent article" referred to in the present application includes, for example, a tape fixed near one end of a sheet-shaped member that covers the inseam (published part) of the wearer from the front body to the back body, in addition to the sheet-shaped member. It includes various forms of absorbent articles that can wrap the abdominal circumference and inseam, such as tape-type disposable diapers that form a tubular structure when attached near the ends.

The diaper 1 covers the inseam area 1B, which is a part corresponding to the inseam area covering the wearer's pubic area (inseam) in the wearing state, and the wearer's abdomen side, which is a part corresponding to the front body around the wearer's torso. It has a front body area 1F for covering and a back body area 1R for covering the back side of the wearer, which is a portion corresponding to the back body around the wearer's torso. Here, the front body region 1F is located on the front side of the inseam region 1B, and the back body region 1R is located on the rear side of the inseam region 1B. Since the diaper 1 in the present embodiment is a pants-type disposable diaper, the left edge of the front body area 1F and the left edge of the back body area 1R are joined to each other, and the right edge and the back body of the front body area 1F are joined to each other. The right edges of region 1R are joined together. Therefore, in the diaper 1, the trunk opening 2T is formed by the upper edge of the front body region 1F and the upper edge of the rear body region 1R. Further, in the diaper 1, the left lower limb opening 2L is formed in the left side portion of the inseam region 1B to which the joint is not applied, and the right lower limb opening 2R is formed in the right portion of the inseam region 1B. Then, in the diaper 1, the wearer's left lower limb is inserted through the left lower limb opening 2L, the wearer's right lower limb is inserted through the right lower limb opening 2R, and the wearer's torso enters the torso opening 2T. When worn, the front torso area 1F is placed on the wearer's abdominal side, the back body area 1R is placed on the wearer's back side, and the left lower limb opening 2L and the right lower limb opening 2R are on the wearer's thigh. It is fixed to the wearer's body while surrounding the part. Since the diaper 1 is fixed to the wearer's body in such a form, the wearer can walk while wearing the diaper 1.

In the diaper 1, an absorber capable of absorbing and holding the liquid is mainly arranged in the vicinity of the inseam region 1B. In addition, the left lower limb opening surrounding the thigh of the wearer's left lower limb in order to suppress the formation of a gap in the diaper 1 that serves as a liquid outflow route between the diaper 1 and the wearer's skin. A three-dimensional gather 3BL is provided in 2L, a three-dimensional gather 3BR is provided in the right lower limb opening 2R surrounding the thigh of the wearer's right lower limb, and a waist gather 3R is provided in a portion surrounding the wearer's abdominal circumference. The three-dimensional gathers 3BL, 3BR and the waist gathers 3R are in close contact with the wearer's skin due to the elastic force of the rubber thread. Therefore, the excrement liquid discharged from the diaper of the wearer is absorbed by the absorber of the diaper 1 with almost no leakage from the diaper 1.

FIG. 2 is an exploded perspective view of the diaper 1 according to the embodiment. Further, FIG. 3 is a diagram schematically showing a stretched state of the diaper 1 according to the embodiment. FIG. 3A schematically shows the internal structure of the diaper 1 in the expanded and extended state when viewed from the left side. FIG. 3B schematically shows a plan view of the diaper 1 in the expanded and extended state.

The diaper 1 has cover sheets 4F and 4R and a pad cover sheet 6 that form an outer surface when worn by the wearer. The cover sheet 4F mainly forms the outer surface of the front body region 1F of the diaper 1. Further, the pad cover sheet 6 mainly forms the outer surface of the inseam region 1B of the diaper 1. Further, the cover sheet 4R mainly forms the outer surface of the back body region 1R of the diaper 1. The cover sheets 4F and 4R and the pad cover sheet 6 are provided to reinforce the outer surface of the diaper 1 and improve the feel, for example, from a liquid-impermeable thermoplastic resin in order to suppress leakage of excrement. Non-woven fabric can be used as the material. Here, examples of the liquid-impermeable thermoplastic resin include polyethylene (PE) and polypropylene (PP).

Further, the diaper 1 includes an inner cover sheet 5F laminated on the wearer side surface (wearer's skin side surface) of the cover sheet 4F, and an inner cover sheet 5R laminated on the wearer side surface of the cover sheet 4F. Have. The inner cover sheet 5F is a sheet-like member having a shape corresponding to the portion of the cover sheet 4F on the inseam region 1B side of the folding line 4F6 described later. Like the inner cover sheet 5F, the inner cover sheet 5R is also a sheet-like member having a shape corresponding to the portion of the cover sheet 4R on the inseam region 1B side of the folding line 4R6 described later.

Further, the diaper 1 has a back sheet 7, an absorber 8, and a center sheet 9 which are sequentially laminated on the wearer side surface of the pad cover sheet 6. The pad cover sheet 6 is a substantially rectangular sheet having a length extending from the front body of the wearer to the back body via the inseam in the longitudinal direction and having a predetermined width in the width direction orthogonal to the longitudinal direction. be. Further, the back sheet 7, the absorber 8, and the center sheet 9 are all sheet-like members having a substantially rectangular appearance like the pad cover sheet 6, and the longitudinal direction coincides with the longitudinal direction of the pad cover sheet 6. In this state, they are laminated in order with respect to the pad cover sheet 6. The back sheet 7 is a sheet formed of a liquid-impermeable thermoplastic resin as a material in order to suppress leakage of excrement. Further, the center sheet 9 is a sheet-like member arranged on the skin surface side of the wearer so as to cover the water absorption surface of the absorber 8. The center sheet 9 has liquid permeability in a part or all thereof. Therefore, in the state where the diaper 1 is worn, the liquid excreted from the wearer penetrates into the absorber 8 through the center sheet 9 which may come into contact with the wearer's skin and is absorbed there. Examples of the liquid permeable sheet include woven fabrics, non-woven fabrics, and porous films. Further, the center sheet 9 may have hydrophilicity.

The absorber 8 contains water in the gaps between short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, or synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate that have been hydrophilized. It has a structure in which granular absorbent resins such as a hydrophilic high-absorbing polymer having a crosslinked structure capable of absorbing and retaining the fibers are retained. Therefore, when the absorber 8 absorbs the liquid excreted from the wearer, the absorbent resin held in the gaps in the short fibers is swollen and the liquid is held in the short fibers. The absorber 8 may have a single-layer structure composed of one mat, or may have a laminated structure in which a plurality of mats are laminated. Further, the absorber 8 can take an appropriate shape according to the purpose. Examples of the shape of the absorber 8 include a rectangular shape, an hourglass shape in which the vicinity of the central portion is constricted, and various other shapes.

The back sheet 7, the absorber 8, and the center sheet 9 all extend from the front body region 1F to the back body region 1R. Therefore, when the wearer's pubic area (inseam) is covered with the pad cover sheet 6 on which the back sheet 7, the absorber 8, and the center sheet 9 are laminated, the back sheet 7, the absorber 8, and the center sheet 9 are in each longitudinal direction. Both ends are located on the ventral and dorsal sides of the wearer. That is, the genital area of the wearer is covered with the absorber 8 from the ventral side to the dorsal side of the wearer. Therefore, regardless of whether the wearer discharges the liquid to the outside of the body in either the posture with the abdomen facing down or the posture with the back facing down, the discharged liquid comes into contact with the absorber 8 via the center sheet 9. Will be done.

Further, the diaper 1 has elongated strip-shaped side sheets 10L and 10R for forming the above-mentioned three-dimensional gathers 3BL and 3BR. The side seats 10L and 10R are provided on the long side portion of the center seat 9. The rubber threads 10L1 and 10R1 are adhered to the side sheets 10L and 10R along the longitudinal direction. Therefore, in the side sheets 10L and 10R, the edge 4F7 of the cover sheet 4F which is the left edge of the front body region 1F and the edge 4R7 of the cover sheet 4R which is the left edge of the rear body region 1R are joined to each other and As shown in FIG. 1, the edge 4F8 of the cover sheet 4F, which is the right edge of the front body region 1F, and the edge 4R8 of the cover sheet 4R, which is the right edge of the rear body region 1R, are joined to each other. When the diaper 1 is in a completed state, it is attracted in the longitudinal direction by the contraction force of the rubber threads 10L1 and 10R1 and rises from the center sheet 9 along the folding lines 10L2 and 10R2. As a result, three-dimensional gathers 3BL and 3BR that prevent the outflow of liquid from the left lower limb opening 2L and the right lower limb opening 2R are formed. The joining method of the edge 4F7 on the cover sheet 4F, the edge 4R7 on the cover sheet 4R, the edge 4F8 on the cover sheet 4F, and the edge 4R8 on the cover sheet 4R is not particularly limited, but for example, heat sealing, high frequency sealing, ultrasonic sealing, etc. Can be done by.

Further, the diaper 1 includes a pad cover sheet 6, a back sheet 7, an absorber 8, a center sheet 9, and a ventilation path forming sheet 11F laminated on the wearer side surface of the cover sheet 4F with the side sheets 10L and 10R interposed therebetween. The cover sheet 4R has a ventilation path forming sheet 11R laminated on the wearer side surface. The ventilation path forming sheet 11F is overlapped with the cover sheet 4F on one end side in the longitudinal direction of the center sheet 9. Further, the ventilation path forming sheet 11R is overlapped with the cover sheet 4R on the other end side in the longitudinal direction of the center sheet 9. In the present application, the state in which the sheets are overlapped is not limited to the form in which the sheets to be overlapped are in full contact with each other, but is a concept including a form in which a part of the sheets is overlapped with each other. For example, the ventilation path forming sheet 11F is stacked so that a part of the pad cover sheet 6 on one end side in the longitudinal direction touches a part of the cover sheet 4F. In the ventilation path forming sheet 11F, a large number of fine ventilation holes for ventilation are arranged in a region extending in the left-right direction along the upper edge of the front body region 1F. Similar to the ventilation path forming sheet 11F, the ventilation path forming sheet 11R also has a large number of ventilation holes arranged. The ventilation hole is, for example, a through hole 20A described later.

As described above, the diaper 1 includes the back sheet 7 and the center sheet 9 sandwiching the absorber 8, as well as the cover sheets 4F and 4R, the ventilation path forming sheets 11F and 11R, the pad cover sheet 6, and the side sheet 10L. Since the 10Rs are formed by stacking them, it can be said that they have a laminated body in which a plurality of these sheets are stacked.

Here, as shown in FIG. 3, one end side of the cover sheet 4F is folded back at the folding line 4F6. The waist gather 3R described above is formed by adhering thread rubber (thread-like rubber) 4F2, 4F3 to the cover sheet 4F and adhering thread rubber (thread-like rubber) 4R2, 4R3 to the cover sheet 4R. Will be done. The thread rubbers 4F2 and 4F3 adhered to the cover sheet 4F are formed of the thread rubber 4F2 and the thread rubber 4F3 from the folding line 4F6 side along the folding line 4F6 which forms the upper edge of the front body region 1F when folded. It is provided in order. Further, the thread rubbers 4R2 and 4R3 adhered to the cover sheet 4R also form the upper edge of the back body region 1R when folded back, like the thread rubbers 4F2 and 4F3, along the folding line 4R6. The thread rubber 4R2 and the thread rubber 4R3 are provided in this order from the side. Therefore, the thread rubbers 4F2 and 4F3 are provided on the cover sheet 4F in a direction in which the waist circumference direction, which is the expansion / contraction direction, is the left-right direction of the diaper 1. Further, the thread rubbers 4R2 and 4R3 are provided on the cover sheet 4R in a direction in which the longitudinal direction, which is the expansion / contraction direction, is the left-right direction of the diaper 1. Therefore, when the edge 4F7 and the edge 4R7 are joined to each other and the edge 4F8 and the edge 4R8 are joined to each other, the thread rubber 4F2, 4F3 and the thread rubber 4R2, 4R3 circulate along the body opening 2T in a substantially annular shape. It forms the elastic member of the above and exerts the function of contracting the body opening 2T in the direction around the body. That is, the thread rubbers 4F2, 4F3 and the thread rubbers 4R2, 4R3 exert a contraction force to bring the diaper 1 into close contact with the wearer, and prevent a gap from being formed between the diaper 1 and the wearer's abdominal circumference.

Further, the thread rubbers 4F4, 4F5 are adhered to the cover sheet 4F, and the thread rubbers 4R4, 4R5 are adhered to the cover sheet 4R. The thread rubbers 4F4 and 4F5 are elastic members provided in the inseam area 1B side of the cover sheet 4F with respect to the thread rubber 4F3. However, unlike the thread rubbers 4F2 and 4F3, which are bonded without interruption from the left end to the right end of the cover sheet 4F, the thread rubbers 4F4F4F4F5 have a predetermined width center portion in the width direction corresponding to the absorber 8. Is only cut. The cover sheet 4F has the thread rubbers 4F4, 4F5 in which the central portion in the width direction, which is the portion corresponding to the absorber 8, is cut, so that the lower abdomen of the wearer is not hindered from the expansion of the absorber 8 due to water absorption. Gives an appropriate feeling of close contact. The cover sheet 4R is the same as the cover sheet 4F, and the thread rubbers 4R4 and 4R5 having the widthwise central portion corresponding to the absorber 8 cut by a predetermined width are adhered to the cover sheet 4R. , Gives a proper fit to the wearer's lower abdomen.

The rubber thread 4F2 is provided so as to extend in the left-right direction along the upper edge portion of the front body region 1F shown in FIG. Three thread rubbers 4F2 are provided in parallel with a predetermined interval. A plurality of thread rubbers 4F3 are provided next to the three thread rubbers 4F2 so as to extend in the left-right direction in the same manner as the thread rubbers 4F2. The thread rubber 4F3 mainly has a function of holding the diaper 1 on the wearer's waist by being located near the portion where the left and right ends of the wearer's pelvis are located when the diaper 1 is worn. Further, the thread rubber 4F2 has a function of preventing liquid from leaking from the diaper 1 by surrounding the wearer's abdominal circumference above the thread rubber 4F3 when the diaper 1 is worn, and the thread rubber 4F3. It has the function of alleviating the feeling of pressure on the wearer caused by the contraction force and the function of discharging the moisture in the diaper 1. As shown in FIG. 3, a plurality of thread rubbers 4F4 and thread rubbers 4F5 are provided next to the thread rubbers 4F3 so as to extend in the left-right direction in the same manner as the thread rubbers 4F3. Then, as described above, in the thread rubbers 4F4 and 4F5, the portion corresponding to the absorber 8 is cut.

FIG. 4 is a diagram showing the relationship between the distance between the rubber threads 4F2 and the size of the ventilation path appearing in the waist gather 3R in the front body region 1F. The figure shown in FIG. 4A is a view when the waist gather 3R is viewed from the side where the wearer's skin touches. Further, the figure shown in FIG. 4B is a view showing the internal structure in the waist gather 3R when viewed from the side of the diaper 1. Further, the figure shown in FIG. 4C is a view showing a state when the West Gather 3R is viewed from above the diaper 1. Further, the figure shown in FIG. 4D is a diagram showing a state in which the waist gather 3R is viewed from above the diaper 1 in a state where the waist gather 3R is contracted. In FIG. 4, for convenience of explanation, the front body region 1F of the waist gather 3R is shown, but the same applies to the rear body region 1R of the waist gather 3R.

As shown in FIG. 4, the cover sheet 4F is folded back along the folding line 4F6 shown in FIG. 2, and the ventilation path forming sheet 11F is further overlapped and joined. The joining is performed in a state where each rubber thread and the sheet are stretched. The dashed line of reference numeral S in the figure shown in FIG. 4 (A) is a joined portion. Further, the portion of the reference numeral S in the drawings shown in FIGS. 4 (C) and 4 (D) is a joined portion.

The joint portion S for joining the cover sheet 4F and the air passage forming sheet 11F in the folded line 4F6 with the cover sheet 4F folded is shown in FIG. 1 as can be seen from the figure shown in FIG. 4 (A). It has a linear shape extending in a direction perpendicular to the upper edge of the front body region 1F shown. A plurality of joint portions S are provided in parallel, and each of the joint portions S is provided so as to alternate in size. Therefore, as can be seen from FIG. 4, the joint portion S has a form in which double lines are lined up at equal intervals. By adopting a form in which the double lines formed by the joint portions S are lined up at equal intervals, as shown in FIG. 4 (D), the first ventilation passage 12 and the second ventilation passage 12 and the second ventilation passage are provided in the waist gather 3R after contraction. The roads 13 are alternately formed. This is performed in a state where each thread rubber and the sheet are stretched, and then when the stretched state is released and the waist gather 3R contracts due to the contraction force of the thread rubber 4F2, the two joint portions forming the double line are formed. A relatively small first air passage 12 is formed by the bending of the sheet in the narrow space between S, and a relatively large second air passage 12 is formed by the bending of the sheet in the wide space between the double lines. This is because 13 is formed.

By forming the joint portion S in such a form that the double lines are lined up at equal intervals, the first air passage 12 and the second air passage 13 formed by the bending of the sheet are large and small in the waist gather 3R after contraction. Alternately formed in a wavy shape. The symbol SS shown by the alternate long and short dash line in FIG. 4D shows the skin surface in contact with the air passage forming sheet 11F as a virtual line when the diaper 1 is worn by the wearer. The second ventilation passage 13 is formed as a gap formed between the skin contact surface of the ventilation passage forming sheet 11F and the wearer's skin when the diaper 1 is worn by the wearer. Moisture between the diaper 1 and the wearer's skin surface can be discharged to the outside through the first air passage 12 and the second air passage 13 formed in the waist gather 3R. As a result, the diaper 1 can suppress the feeling of stuffiness of the wearer. Further, since the diaper 1 has the same ventilation path in the back body region 1R of the waist gather 3R where the ventilation path forming sheet 11R is arranged, the diaper 1 is the same in the back body region 1R of the waist gather 3R. The effect of can be obtained.

Next, the non-woven fabrics that can be used for the cover sheets 4F, 4R, the inner cover sheets 5F, 5R, the pad cover sheet 6, and the ventilation path forming sheets 11F, 11R will be described. FIG. 5A is a plan view of the nonwoven fabrics 20 and 21 that can be used for the cover sheets 4F and 4R, the inner cover sheets 5F and 5R, the pad cover sheet 6, and the ventilation path forming sheets 11F and 11R. The non-woven fabric 21 is superposed on the non-woven fabric 20, and the non-woven fabric 20 and the non-woven fabric 21 have the same size in the longitudinal direction and the width direction. For example, the sheet members obtained by superimposing the non-woven fabrics 20 and 21 may be used for the cover sheets 4F, 4R, the inner cover sheets 5F, 5R, the pad cover sheet 6, and the ventilation path forming sheets 11F, 11R. In this case, the sheet member is cut into dimensions and shapes suitable for these sheets. Further, in the completed diaper 1, the nonwoven fabric 20 may be used for one of the two overlapping sheets, and the nonwoven fabric 21 may be used for the other sheet. For example, the nonwoven fabric 20 may be used for the ventilation path forming sheet 11F, and the nonwoven fabric 21 may be used for the inner cover sheet 5F and the cover sheet 4F.

As shown in FIG. 5A, a plurality of through holes 20A are formed in the nonwoven fabric 20. The through hole 20A is formed so as to penetrate one surface side and the other surface side of the nonwoven fabric 20. The through hole 20A is a hole for ventilation (vent hole), and is provided to suppress stuffiness in the diaper 1. In the embodiment, the through hole 20A is formed in a circular shape. The diameter of the through hole 20A is about 1 mm to 1.5 mm. The shape of the through hole 20A is not limited to a circular shape, and the shape of the through hole 20A may be, for example, an ellipse, a polygon (triangle, quadrangle, etc.) or the like. The size and number of the through holes 20A are not particularly limited, but for example, if the holes have an opening area of 0.5 to 10 mm ² , it is preferable that about 5 to 200 holes are formed in the nonwoven fabric 20.

When viewed in the longitudinal direction of the nonwoven fabric 20, a plurality of through holes 20A are formed side by side in a row. Further, when viewed in the width direction of the nonwoven fabric 20, the through holes 20A are arranged alternately. The plurality of through holes 20A are arranged in a staggered pattern as a whole. The plurality of through holes 20A may be arranged in a matrix as a whole.

5 (B) is an enlarged view showing the area A surrounded by the dotted line in FIG. 5 (A). A plurality of through holes 20A are formed side by side in the longitudinal direction of the nonwoven fabric 20. Further, on the surface side of the nonwoven fabric 21 facing the nonwoven fabric 20, a bonding region 21A extending in the longitudinal direction of the nonwoven fabrics 20 and 21 with a predetermined width and coated with hot melt is formed. The center of the joint region 21A in the longitudinal direction is in contact with the outer edge portion of the through hole 20A in the width direction of the nonwoven fabric 20. The joining region 21A is provided so as to extend in the direction in which the plurality of through holes 20A are lined up. For example, when a plurality of through holes 20A are formed side by side in the width direction of the nonwoven fabrics 20 and 21, even if the bonding region 21A is formed so as to extend in the width direction of the nonwoven fabrics 20 and 21 with a predetermined width. good.

The outer edge portion 20B of the through hole 20A is joined to the joining region 21A. In FIG. 5B, the outer edge portion 20B is surrounded by a dotted circle. The outer edge portion 20B surrounds the through hole 20A. The outer edge portion 20B protrudes toward the non-woven fabric 21 side, and a part of the outer edge portion 20B is joined to the joining region 21A. The nonwoven fabrics 20 and 21 are overlapped so that the positions of the plurality of through holes 20A arranged in the longitudinal direction of the nonwoven fabric 20 and the bonding region 21A are aligned, and more specifically, the outer edge portion 20B and the bonding region 21A overlap each other. Will be done. As a result, the outer edge portion 20B is joined to the joining region 21A. When the nonwoven fabrics 20 and 21 are combined, they overlap with at least a part of each outer edge portion 20B, and at least a part of each outer edge portion 20B overlaps with the bonding region 21A, and the outer edge portion 20B is bonded to the bonding region 21A. The predetermined width of the joining region 21A is preferably equal to or larger than the width of the outer edge portion 20B.

5 (C) is a cross-sectional view of the nonwoven fabrics 20 and 21 cut along the line BB in FIG. 5 (B). The BB line passes through two bonding regions 21A to which the center of the through hole 20A and the outer edge portion 20B of the through hole 20A are bonded when the surfaces of the nonwoven fabrics 20 and 21 are viewed in an orthogonal direction (thickness direction). It is a line. The cross-sectional view shown in FIG. 5C includes the through hole 20A and the two joining regions 21A.

As shown in FIG. 5C, the outer edge portion 20B of the through hole 20A projects toward the non-woven fabric 21 side, and a part of the outer edge portion 20B is joined to the joining region 21A. In the embodiment, the tip of the outer edge portion 20B is joined to the joining region 21A. In the nonwoven fabric 21, the air permeability can be further improved by forming a notch in the region 21B overlapping the through hole 20A.

The through hole 20A is heat-treated to maintain the shape of the through hole by heating the perforation needle to a predetermined temperature or higher and heating and deforming the thermoplastic resin material contained in the nonwoven fabric 20 when forming the through hole. To. The outer edge portion 20B around the heat-treated through hole 20A becomes hard, but a part of the outer edge portion 20B is joined to the joining region 21A of the nonwoven fabric 21. Further, in the diaper 1, the nonwoven fabric 20 is arranged closer to the wearer's skin side in the wearing state than the nonwoven fabric 21. By joining and fixing at least a part of the outer edge portion 20B to the non-woven fabric 21, it is possible to prevent the outer edge portion 20B from touching the wearer's skin and prevent the wearing feeling from being deteriorated.

The diaper 1 includes a sheet member having the non-woven fabrics 20 and 21, and the sheet member may be arranged in at least one of the front body region 1F and the back body region 1R. For example, the sheet member may be used for the ventilation path forming sheets 11F and 11R arranged on the waist gather 3R. As a result, the ventilation passage forming sheets 11F and R can be ensured to be ventilated by the through hole 20A, and the first ventilation passage 12 shown in FIG. 4D can be more easily introduced with moisture through the through hole 20A.

Further, in the diaper 1, by stacking the nonwoven fabrics 20 and 21, the region where the nonwoven fabrics 20 and 21 are arranged can be made bulky, and the cushioning property can be improved. Further, when the nonwoven fabrics 20 and 21 are aligned and overlapped, it is preferable that the bonding region 21A coated with the hot melt does not exist in the region 21B shown in FIG. 5 (C). This is because if the hot melt solidifies and comes into direct or indirect contact with the wearer's skin, the wearing feeling may be deteriorated. In order to minimize the area of the bonding region 21A coated with the hot melt, it is preferable that the bonding region 21A is provided in a region overlapping the outer edge portion 20B when the nonwoven fabrics 20 and 21 are overlapped. This makes it possible to prevent a decrease in the wearing feeling of the diaper 1.

Although the diaper 1 has been exemplified in the above embodiment, the above configuration and manufacturing method can be applied to other forms of absorbent articles. Absorbent articles to which the above configuration and manufacturing method can be applied include, for example, various forms of absorbent articles with gathers such as pants-type disposable diapers, tape-type disposable diapers, urine pads, and light incontinence pads, and no gathers. Examples include flat absorbent articles.

1 ・ ・ Diaper: 1B ・ ・ Inseam area: 1F ・ ・ Front body area: 1R ・ ・ Back body area: 2T ・ ・ Body opening: 2L ・ ・ Left lower limb opening: 2R ・ ・ Right lower limb opening: 3BL, 3BR ... 3D gather: 3R ... West gather: 4F, 4R ... Cover sheet: 4F1,4R1 ... Opening: 4F2,4F3,4F4,4F5,4R2,4R3,4R4,4R5,10L1,10R1 ... : 4F6, 4R6, 10L2, 10R2 ... Folded line: 4F7, 4F8, 4R7, 4R8 ... Edge: 5F, 5R ... Inner cover sheet: 6 ... Pad cover sheet: 7 ... Back sheet: 8 ... Absorption Body: 9 ... Center sheet: 10L, 10R ... Side sheet: 11F, 11R ... Ventilation path forming sheet: S ... Joint part: 12 ... First ventilation path: 13 ... Second ventilation path: 20, 21 ... Non-woven fabric: 20A ... Through hole: 20B ... Outer edge: 21A ... Joint area: 21 ... Area

Claims (3)

A front body area covering the wearer's abdomen, a back body area covering the wearer's back, and an inseam area located between the front body area and the back body area and in which an absorber is arranged are continuously provided. It ’s an absorbent article,
Of the front body region and the rear body region, the region is provided in a region close to the torso opening end edge forming the torso opening through which the wearer's torso can be inserted, and is extended in a ring shape along the torso circumference direction. A contraction part where an elastic member is arranged and the area is contracted in the waist direction, and a contraction portion.
A ventilation path forming sheet laminated and arranged on the sheet member forming the contracted portion so as to cover at least a part of the wearer-side surface of the contracted portion.
Equipped with
The ventilation path forming sheet is
It has at least a first non-woven fabric with through holes formed in it.
The outer edge portion of the through hole protrudes toward the second nonwoven fabric side superimposed on the first nonwoven fabric .
At least a part of the outer edge portion is joined to the second non-woven fabric ,
The first nonwoven fabric is arranged closer to the skin surface of the wearer in the wearing state than the second nonwoven fabric.
Absorbent article. A plurality of the through holes are formed side by side in one direction.
On the surface side of the second nonwoven fabric facing the first nonwoven fabric, a joint region extending in one direction with a predetermined width and coated with hot melt is formed.
The first nonwoven fabric and the second nonwoven fabric are overlapped so that the positions of the plurality of through holes arranged in one direction and the joining region are aligned, and the center in the longitudinal direction of at least a part of the outer edge portion is the said. The first nonwoven fabric is joined to the joining region so as to be in contact with the outer edge of the through hole in the width direction .
The absorbent article according to claim 1 . A sheet member having the first nonwoven fabric and the second nonwoven fabric is provided.
The seat member is located in at least one of the front body area covering the wearer's abdomen or the back body area covering the wearer's back.
The absorbent article according to claim 1 or 2 .

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