JP2022070524A - Disposable absorbent article - Google Patents

Abstract

To facilitate tearing upward a side seal part from the bottom edge.SOLUTION: A plurality of first welded parts 511 extend upward toward the outside in the width direction, a plurality of second welded parts 521 extend upward toward the outside in the width direction, and a plurality of third welded parts 531 extend downward toward the outside in the width direction. When a set of welded part group 54 is composed of each one of the first welded parts 511, the second welded parts 521 and the third welded parts 531 adjacent each other in the width direction, in each welded part group 54, a bottom edge of the third welded part 531 is positioned above a bottom edge of the second welded part 521, a bottom edge of the second welded part 521 is positioned above a bottom edge of the first welded part 511, a top edge of the second welded part 521 is positioned above a top edge of the first welded part 511, and an extended line outward in the width direction of the second welded part 521 crosses the third welded part 531. Thereby, a side seal part 5 can be easily torn upward from a bottom edge.SELECTED DRAWING: Figure 6

Description

The present invention relates to a pants-type disposable absorbent article.

Conventionally, as one of the absorbent articles that receive excrement from the wearer, a pants-type disposable diaper having a body opening at the upper end and a pair of leg openings at the lower end has been used. The disposable diaper is usually formed in a pants shape by overlapping and joining both sides of the front portion and both sides of the rear portion of the exterior sheet.

When such a pants-type absorbent article is removed from the wearer, both sides (that is, side seals) of the exterior sheet are torn downward from the body opening to separate the front and rear parts. When tearing both sides thereof, it is preferable that the tearing force is easily transmitted downward and the tearing force can be continuously torn from the body opening to the leg opening. Therefore, it has been proposed to facilitate the tearing of both side portions by devising the shape of the welding pattern provided on both side portions of the exterior sheet.

For example, in Patent Document 1, at the lateral end portion of the pants-type absorbent article, the patterns of the welded portions arranged in the inner region, the middle region, and the outer region are different. Specifically, each welded portion in the inner region inclines downward toward the laterally outward side. Each welded portion of the outer region is inclined upward toward the laterally outward side. In the middle region, the welded portion that inclines downward toward the outside in the lateral direction and the welded portion that inclines upward toward the outside in the lateral direction are alternately arranged in the vertical direction. As a result, the force for tearing the lateral end portion is guided downward along the boundary between the welded portion and the surrounding portion, and the lateral end portion is easily torn.

JP-A-2015-208534

By the way, when the wearer of the pants-type absorbent article tries to tear off both sides of the absorbent article by himself, he turns his hands toward the side of the waist and grabs the side end of the torso opening. You need to pull it back and forth. In addition, in order for the wearer wearing the absorbent article to visually check the side end of the body opening, it is necessary to twist the upper body greatly. For this reason, it may be difficult for the elderly wearer, who has reduced physical flexibility, to tear and remove the absorbent article by himself / herself.

Therefore, when tearing the side portion of the absorbent article, it is conceivable to grab the side end portion of the leg opening and tear it upward. However, when the lateral end portion of the pants-type absorbent article of Patent Document 1 is torn upward from the leg opening, a plurality of pieces that incline downward in the inner region and the middle region toward the lateral outer side. There is a possibility that the welded part of the slab becomes a resistance and cannot be easily torn upward. Further, in the pants-type absorbent article of Patent Document 1, in the inner region which is the starting point of tearing at the lateral end portion, the distance between the plurality of welded portions arranged in the vertical direction is larger than that in the middle region and the outer region. big. For this reason, the joint strength of the inner region of the lateral end portion is lowered, and the vicinity of the body opening of the lateral end portion may be unintentionally torn due to the force applied by the wearer's movement or the like.

The present invention has been made in view of the above problems, and an object of the present invention is to easily tear the side seal portion upward from the lower end in a pants-type absorbent article.

The invention according to claim 1 is a pants-type disposable absorbent article having a body opening at the upper end and a pair of leg openings at the lower end, and has a front portion located on the ventral side of the wearer. The rear portion located on the back side of the wearer, the front portion and the crotch portion continuous from the rear portion, and both ends in the width direction of the front portion and both ends in the width direction of the rear portion are joined. Each of the pair of side seal portions is provided with a pair of side seal portions which are strip-shaped portions extending in the vertical direction, and the pair of side seal portions are strip-shaped regions extending in the vertical direction, respectively, separated from each other in the vertical direction. A first region provided with a plurality of first welded portions to be arranged, and a strip-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the first region, and a plurality of regions arranged in the vertical direction separated from each other. A second region in which the second welding portion is provided, and a band-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the second region, and a plurality of third welding regions arranged apart from each other in the vertical direction. The plurality of first welded portions, the plurality of second welded portions, and the plurality of third welded portions are discontinuous with each other, and the plurality of first welded portions are each provided with a third region provided with portions. , Extending parallel to the width direction, or upward toward the outside in the width direction, and each of the plurality of second welding portions upwards toward the outside in the width direction, and the plurality of third welding portions. The portions are directed downward toward the outside in the width direction, and if each one of the first welding portions, the second welding portions, and the third welding portions adjacent to each other in the width direction is a set of welding portions, a pair of portions is formed. In each of the side seal portions, a plurality of sets of welded portions are arranged in the vertical direction, and in each of the plurality of sets of welded portions, the lower end of the third welded portion is larger than the lower end of the second welded portion. Located on the upper side, the lower end of the second welded portion is located above the lower end of the first welded portion, and the upper end of the second welded portion is located above the upper end of the first welded portion. The extension line of the second welded portion outward in the width direction intersects the third welded portion.

The invention according to claim 2 is the disposable absorbent article according to claim 1. In each of the plurality of sets of welded portions, the acute angle formed by the second welded portion and the width direction is the above-mentioned first. 1 It is larger than the acute angle formed by the welded portion and the width direction.

The invention according to claim 3 is the disposable absorbent article according to claim 1 or 2, wherein in each of the plurality of sets of welded portions, the acute angle formed by the third welded portion and the width direction is determined. It is larger than the acute angle formed by the second welded portion and the width direction.

The invention according to claim 4 is the disposable absorbent article according to any one of claims 1 to 3, and is outside the width direction of the first welded portion in each of the plurality of sets of welded portions. The extension line toward the direction intersects the second welded portion.

The invention according to claim 5 is the disposable absorbent article according to any one of claims 1 to 4, and is an extension line inward in the width direction of the third welded portion in each welded portion group. Crosses the second welded portion of another welded portion group adjacent to the upper side of each welded portion group.

The invention according to claim 6 is the disposable absorbent article according to any one of claims 1 to 5, wherein in each of the plurality of sets of welded portions, the lower end of the second welded portion is. It is located at the same position in the vertical direction as the upper end of the first welded portion, or below the upper end of the first welded portion.

The invention according to claim 7 is the disposable absorbent article according to claim 6, which is an elastic member that is joined to the front portion or the rear portion along the width direction and shrinks to form gathers. The widthwise end of the elastic member passes between the upper end of the first welded portion and the lower end of the second welded portion in one of the plurality of welded portions. do.

The invention according to claim 8 is the disposable absorbent article according to any one of claims 1 to 7, wherein in each of the plurality of sets of welded portions, the lower end of the third welded portion is. It is located at the same position in the vertical direction as the upper end of the second welded portion, or below the upper end of the second welded portion.

The invention according to claim 9 is the disposable absorbent article according to any one of claims 1 to 8, and in each welding part group, the upper end of the third welding part is the welding part group. It is located at the same position in the vertical direction as the lower end of the first welded portion of the other welded portion group adjacent to the upper side of the above, or above the lower end of the first welded portion of the other welded portion group.

The invention according to claim 10 is the disposable absorbent article according to any one of claims 1 to 9, wherein the plurality of first welded portions and the plurality of second welded portions are in the width direction. A non-welded region extending continuously in the vertical direction is provided between the space and between the plurality of second welded portions and the width direction of the plurality of third welded portions.

The invention according to claim 11 is the disposable absorbent article according to any one of claims 1 to 10, wherein the plurality of first welded portions are arranged at equal pitches in the vertical direction, and the plurality of first welded portions are arranged at equal pitches in the vertical direction. The second welded portions are arranged at equal pitches in the vertical direction, and the plurality of third welded portions are arranged at equal pitches in the vertical direction.

The invention according to claim 12 is the disposable absorbent article according to any one of claims 1 to 11, wherein in the pair of side seal portions, the plurality of first welds of one side seal portion. The plurality of first welded portions of the portion and the other side seal portion are arranged alternately in the vertical direction, and the plurality of second welded portions of the one side seal portion and the plurality of the other side seal portions. The second welded portions are arranged alternately in the vertical direction, and the plurality of third welded portions of the one side seal portion and the plurality of third welded portions of the other side seal portion are arranged in the vertical direction. Are arranged alternately with respect to.

In the present invention, the side seal portion can be easily torn upward from the lower end.

It is a front view of the absorbent article which concerns on one Embodiment. It is a back view of the absorbent article. It is a top view of the absorbent article in the unfolded state. It is sectional drawing of the absorbent article. It is a front view which shows the side seal part enlarged. It is a figure which shows the part of the side seal part enlarged. It is a figure which shows the part of the side seal part enlarged. It is a figure which shows the part of the side seal part enlarged. It is a figure which shows the part of the side seal part enlarged. It is a figure which shows the part of the side seal part enlarged. It is a top view which shows a part of the manufacturing apparatus of an absorbent article. It is a development view which shows the part of the outer surface of an anvil roll enlarged.

1 and 2 are front and back views (that is, views of parts located on the ventral and dorsal sides of the wearer) of the disposable absorbent article 1 according to the embodiment of the present invention, respectively. In the following description, the disposable absorbent article 1 is simply referred to as "absorbent article 1". Further, the vertical direction and the horizontal direction in FIGS. 1 and 2 are simply referred to as "vertical direction" and "horizontal direction". The left-right direction is the left-right direction when the absorbent article 1 is worn by the wearer. Further, in the following description, the left-right direction is also referred to as a "width direction".

As shown in FIGS. 1 and 2, the absorbent article 1 has a body opening 11 at the upper end (ie, the upper end in FIGS. 1 and 2) and a pair of leg openings 12 at the bottom. It is a pants-type absorbent article that has. The absorbent article 1 is, for example, a disposable diaper for adults. The absorbent article 1 is worn by the wearer and receives excrement from the wearer.

FIG. 3 is a plan view seen from the wearer side in a state where the absorbent article 1 is unfolded. The absorbent article 1 includes an exterior sheet 4 and an absorber 20. In the example shown in FIG. 3, the shape of the absorber 20 in a plan view is substantially rectangular. The shape of the absorber 20 in a plan view may be changed as appropriate. The exterior sheet 4 is provided with a body opening 11 and a pair of leg openings 12 (see FIGS. 1 and 2). The absorber 20 is mounted on the inner surface (that is, the surface on the wearer side) of the exterior sheet 4. The absorber 20 is a substantially sheet-like member that absorbs excrement from the wearer.

In the absorbent article 1, the upper portion in FIG. 3 covers the wearer's anterior side (ie, ventral skin) and the lower portion in FIG. 3 covers the wearer's posterior side (ie, dorsal skin). ). In the following description, the parts of the absorbent article 1 located on the ventral side and the dorsal side of the wearer are referred to as "anterior portion 401" and "rear portion 403", respectively. Further, in the absorbent article 1, the portion between the front portion 401 and the rear portion 403 is referred to as "inseam 402". The inseam 402 is continuous with the anterior 401 and the posterior 403. The inseam 402 covers the wearer's crotch. The anterior portion 401, inseam portion 402 and rear portion 403 of the absorbent article 1 are also the anterior portion, inseam lower portion and rear portion of the exterior sheet 4. In other words, the exterior sheet 4 includes a front portion 401, a crotch lower portion 402, and a rear portion 403. The absorber 20 reaches the rear portion 403 from the front portion 401 of the exterior sheet 4 via the crotch portion 402.

When the absorbent article 1 is manufactured, the exterior sheet 4 is bent at the inseam 402 together with the absorber 20. Then, the inner surfaces of both ends in the left-right direction of the front portion 401 of the exterior sheet 4 and the inner surfaces of both ends in the left-right direction of the rear portion 403 are joined to form a pair of side seal portions 5. As a result, as shown in FIGS. 1 and 2, a body opening 11 is formed at the upper ends of the front portion 401 and the rear portion 403. Further, a pair of leg openings 12 are formed on the left and right sides of the inseam 402 on the lower side of the front portion 401 and the rear portion 403.

Each side seal portion 5 is a band-shaped portion extending in the vertical direction. In the examples shown in FIGS. 1 and 2, each side seal portion 5 has a substantially rectangular shape that is long in the vertical direction. As will be described later, each side seal portion 5 is formed by crimping with an anvil roll provided with a welding pattern. The side seal portion 5 is joined by, for example, an ultrasonic seal or a heat seal.

FIG. 4 is a cross-sectional view of the absorbent article 1 cut at the position IV-IV shown in FIG. 3 (ie, inseam 402). In FIG. 4, for convenience of illustration, each configuration of the absorbent article 1 is drawn separately. As shown in FIGS. 3 and 4, the absorber 20 includes a main body portion 2 and a pair of side seats 3. The pair of side seats 3 are arranged on both side portions of the main body portion 2 (that is, both sides in the left-right direction perpendicular to the vertical direction). Each side sheet 3 is a substantially sheet-like member over approximately the entire length in the longitudinal direction of the main body 2 (that is, the direction parallel to the vertical direction when worn).

The main body 2 is a substantially sheet-like member, and includes a top sheet 21, a back sheet 23, and an absorption core 22. The top sheet 21 is a liquid-permeable sheet member. The back sheet 23 is a liquid-impermeable or liquid-repellent sheet member. The absorption core 22 is a substantially sheet-like member arranged between the top sheet 21 and the back sheet 23. The top sheet 21 covers the wearer-side surface of the absorbent core 22. The back sheet 23 covers the surface of the absorption core 22 opposite to the wearer.

The top sheet 21 captures the water in the excrement from the wearer and transfers the water to the absorption core 22. The absorption core 22 absorbs and fixes the water that has permeated through the top sheet 21 (that is, the water of the excrement from the wearer). The back sheet 23 prevents the water and the like of the excrement that has reached the back sheet 23 from seeping out to the outside of the main body 2.

In FIG. 3, the outline of the absorption core 22 of the absorber 20 is drawn by a thick broken line in order to facilitate the understanding of the figure. The same applies to FIGS. 1 and 2. As shown in FIG. 3, the width at both ends of the absorption core 22 in the longitudinal direction is larger than the width at the central portion in the longitudinal direction of the absorption core 22. In other words, the shape of the absorption core 22 in a plan view is a so-called hourglass shape. The back sheet 23 shown in FIG. 4 is joined onto the exterior sheet 4 with a hot melt adhesive or the like. As a result, the absorber 20 is fixed to the exterior sheet 4. The shape of the absorption core 22 in a plan view may be changed as appropriate.

Each of the pair of side seats 3 includes a joint portion 33 and a side wall portion 34. The joint portion 33 is a strip-shaped portion on one side of the bending line 39 provided over the entire length in the longitudinal direction in the side sheet 3. The joint portion 33 is joined to the upper side of the main body portion 2 (that is, the wearer side) by using a hot melt adhesive or the like in the vicinity of the lateral edge of the main body portion 2 over an approximately entire length in the longitudinal direction. The side wall portion 34 is a strip-shaped portion of the side sheet 3 on the other side of the bending line 39. The side wall portion 34 is a portion continuous from the pair of joint portions 33 at the bending line 39 (that is, the outer edge in the left-right direction of the joint portion 33). The side wall portion 34 extends on both side portions of the main body portion 2 over approximately the entire length in the longitudinal direction of the main body portion 2.

Each side wall portion 34 is overlapped on the joint portion 33 and fixed to the joint portion 33 at both ends in the longitudinal direction. The side wall portion 34 and the joint portion 33 are fixed by, for example, heat sealing, ultrasonic sealing, or bonding with a hot melt adhesive or the like. The portion of each side wall portion 34 excluding both ends in the longitudinal direction (that is, the central portion in the longitudinal direction) is not joined to the joint portion 33 and can be separated from the joint portion 33. A side wall elastic member 35 is joined to the free end of each side wall 34. By contracting the side wall portion elastic member 35, the central portion in the longitudinal direction of the side wall portion 34 stands up, and a three-dimensional gather is formed. As a result, it is possible to prevent the excrement received by the absorber 20 between the pair of side wall portions 34 from leaking to the outside of the pair of side wall portions 34. The shape and structure of the pair of side seats 3 may be changed in various ways. Further, the pair of side seats 3 may be omitted.

The top sheet 21 is formed of, for example, a liquid-permeable non-woven fabric (air-through non-woven fabric, point-bonded non-woven fabric, spunbond non-woven fabric, spunlace non-woven fabric, etc.). The nonwoven fabric is formed of, for example, hydrophobic fibers (polypropylene, polyethylene, polyester, polyamide, nylon, etc.) whose surface is hydrophilically treated with a surfactant. The nonwoven fabric may be formed of hydrophilic fibers such as cellulose, rayon or cotton.

The absorption core 22 contains, for example, at least one of a granular or fibrous highly absorbent material and an aggregate of hydrophilic fibers as an absorbent material. As the highly absorbent material, for example, a granular super absorbent polymer (SAP (Super Absorbent Polymer)) or a fibrous super absorbent fiber (SAF (Super Absorbent Fiber)) is used. The aggregate of the hydrophilic fibers is formed, for example, from crushed pulp fibers or cellulose fibers.

In the example shown in FIG. 4, the absorption core 22 is formed by wrapping a mixture of the above-mentioned aggregates of hydrophilic fibers with granular SAP with tissue paper, a liquid-permeable non-woven fabric, or the like. This makes it possible to prevent the aggregate of hydrophilic fibers from losing its shape and the SAP from falling off (particularly, falling off after absorbing liquid).

The backsheet 23 is formed of, for example, an impermeable or liquid-repellent nonwoven fabric (spunbonded nonwoven fabric, meltblow nonwoven fabric, SMS (spunbond, meltblow, spanbond) nonwoven fabric, etc.) formed of hydrophobic fibers. Alternatively, the backsheet 23 is formed of an impermeable or liquid repellent plastic film. The back sheet 23 may be a laminate of the non-woven fabric and the plastic film. When a plastic film is used for the back sheet 23, a breathable (that is, breathable) plastic film is used from the viewpoint of preventing stuffiness of the absorbent article 1 and improving the comfort of the wearer. Is preferable.

The sheet body of the side sheet 3 is formed of an impermeable or liquid-repellent nonwoven fabric (for example, spunbonded nonwoven fabric, melt blow nonwoven fabric, SMS nonwoven fabric) formed of hydrophobic fibers. As the side wall elastic member 35, for example, a polyurethane thread, a band-shaped polyurethane film, a thread-shaped or band-shaped natural rubber, or the like is used. In this embodiment, the polyurethane thread is used as the side wall elastic member 35.

The exterior sheet 4 includes an exterior sheet main body 40, a leg elastic member 43, a body elastic member 44, and an intermediate elastic member 45. The leg elastic member 43, the body elastic member 44, and the intermediate elastic member 45 are joined to the exterior sheet main body 40. Specifically, the exterior sheet main body 40 has a structure in which a plurality of sheet members are laminated, and the leg elastic member 43, the body elastic member 44, and the intermediate elastic member 45 are made of a plurality of such sheets by using a hot melt adhesive or the like. It is joined between the sheet members of.

Similar to the back sheet 23, the plurality of sheet members of the exterior sheet body 40 are impermeable or liquid-repellent nonwoven fabrics formed of hydrophobic fibers (for example, spunbonded nonwoven fabrics, melt-blown nonwoven fabrics, SMS nonwoven fabrics, etc.). Formed by. Alternatively, the plurality of sheet members may be a laminate of the above-mentioned nonwoven fabric and a liquid-impermeable or liquid-repellent plastic film. As the plastic film, it is preferable to use a film having moisture permeability. Further, as the plurality of sheet members, a liquid-permeable nonwoven fabric may be used as in the case of the top sheet 21.

The leg elastic member 43 is arranged along the edges of the pair of leg openings 12. The leg elastic member 43 is, for example, a polyurethane thread, a band-shaped polyurethane film, or a thread-shaped or band-shaped natural rubber. In the examples shown in FIGS. 1 and 2, the leg elastic member 43 includes a plurality of leg elastic elements, each of which is a polyurethane thread. The plurality of leg elastic elements are arranged substantially parallel to each other. The upper end portion of the leg elastic member 43 is located at the front portion 401 and the rear portion 403 of the exterior sheet 4. Further, a portion other than the upper end portion of each leg elastic member 43 is located at the crotch lower portion 402 of the exterior sheet 4. In the absorbent article 1, the contraction of the leg elastic member 43 causes the exterior sheet body 40 to contract in the vicinity of the pair of leg openings 12, and the pair of leg gathers (that is, the pair of legs) in contact with the wearer's legs. Part opening gathers) are formed.

The body elastic member 44 is joined to the front portion 401 and the rear portion 403 along the edge of the body portion opening 11. The body elastic member 44 is provided over substantially the entire length of the front portion 401 and the rear portion 403 in the left-right direction. The body elastic member 44 is, for example, a polyurethane thread, a band-shaped polyurethane film, or a thread-shaped or band-shaped natural rubber. In the examples shown in FIGS. 1 and 2, the body elastic member 44 includes a plurality of body elastic elements, each of which is a polyurethane thread. The plurality of torso elastic elements extend substantially parallel in the left-right direction. In the absorbent article 1, the contraction of the body elastic member 44 causes the exterior sheet body 40 to contract in the vicinity of the body opening 11, and waist gathers (that is, body opening gathers) in contact with the wearer's waist are formed. To.

The intermediate elastic member 45 is joined to the front portion 401 and the rear portion 403 in the region between the upper end portion of the leg elastic member 43 and the body elastic member 44 in the vertical direction. The intermediate elastic member 45 is provided over substantially the entire length of the front portion 401 and the rear portion 403 in the left-right direction. The intermediate elastic member 45 is, for example, a polyurethane thread, a band-shaped polyurethane film, or a thread-shaped or band-shaped natural rubber. The intermediate elastic member 45 includes a plurality of intermediate elastic elements, each of which is a polyurethane thread. The plurality of intermediate elastic elements extend substantially parallel to each other in the left-right direction. In the absorbent article 1, the outer sheet main body 40 contracts due to the contraction of the intermediate elastic member 45, and body fit gathers (that is, intermediate gathers) in contact with the lower abdomen and buttocks of the wearer are formed. The intermediate elastic member 45 may or may not overlap with the absorber 20.

FIG. 5 is an enlarged front view showing the side seal portion 5 on the right side in FIG. 1. In FIG. 5, the width of the side seal portion 5 in the left-right direction (that is, the width direction) is drawn larger than the actual length in the vertical direction.

The side seal portion 5 includes a first region 51, a second region 52, and a third region 53. In FIG. 5, the first region 51, the second region 52, and the third region 53 are shown surrounded by a rectangular frame of a two-dot chain line, respectively. The first region 51, the second region 52, and the third region 53 are each a substantially rectangular band-shaped region extending in the vertical direction.

The first region 51 is located on the innermost side in the width direction in the side seal portion 5. The second region 52 is adjacent to the outside of the first region 51 in the width direction. The third region 53 is adjacent to the outside of the second region 52 in the width direction. The third region 53 is located on the outermost side in the width direction in the side seal portion 5. That is, the first region 51, the second region 52, and the third region 53 are arranged in this order from the inside in the width direction (that is, the side closer to the body opening 11 and the leg opening 12 in the width direction) to the outside. Line up in the width direction.

The first region 51 is provided with a plurality of first welded portions 511 that are vertically arranged apart from each other. The second region 52 is provided with a plurality of second welded portions 521 arranged apart from each other in the vertical direction. The third region 53 is provided with a plurality of third welded portions 531 arranged vertically apart from each other. In the first welded portion 511, the second welded portion 521 and the third welded portion 531, the front portion 401 and the rear portion 403 (see FIGS. 1 and 2) of the exterior sheet 4 are welded to each other (that is, welding marks). ). In FIG. 5, in order to facilitate understanding of the figure, the sizes of the first welded portion 511, the second welded portion 521, and the third welded portion 531 are drawn larger than the actual size, and the first welded portion 511 and the second welded portion 511 are drawn. The number of portions 521 and the third welded portion 531 is drawn to be smaller than the actual number.

The plurality of first welded portions 511 each go upward toward the outside in the width direction. In the example shown in FIG. 5, each first welded portion 511 has an elongated rectangular shape extending substantially linearly from the inner edge in the width direction (hereinafter, also simply referred to as “inner edge”) diagonally upward to the right in the figure. be. The inner edge of the first welded portion 511 means a side (that is, a short side) located inside the first welded portion 511 in the width direction. The same applies to the inner edges of the second welded portion 521 and the third welded portion 531. The length of the short side of the first welded portion 511 is, for example, 0.1 mm to 1.0 mm, and is about 0.25 mm in the present embodiment. The length of the long side of the first welded portion 511 is, for example, 1.1 mm to 4.4 mm. The length of the first welded portion 511 in the width direction (that is, the left-right direction) is, for example, 1.0 mm to 4.0 mm, and in the present embodiment, it is about 1.9 mm or about 2.9 mm.

Each first welded portion 511 is arranged substantially parallel to the first welded portion 511 adjacent in the vertical direction. The plurality of first welded portions 511 are arranged in the vertical direction at substantially equal pitches. The pitch in the vertical direction of the plurality of first welded portions 511 is, for example, the vertical distance between the lower ends of each of the two first welded portions 511 adjacent to each other in the vertical direction. The pitch is, for example, 1.5 mm to 5.0 mm, and in the present embodiment, it is about 2.0 mm or about 3.0 mm. The lower end of the first welded portion 511 means a portion of the first welded portion 511 closest to the leg opening 12 in the vertical direction. The same applies to the lower ends of the second welded portion 521 and the third welded portion 531. In the example shown in FIG. 5, the lower end of the first welded portion 511 is an apex which is the lower end of the inner edge of the first welded portion 511.

Further, the upper end of the first welded portion 511 means the portion of the first welded portion 511 farthest from the leg opening 12 in the vertical direction. The same applies to the upper ends of the second welded portion 521 and the third welded portion 531. In the example shown in FIG. 5, the upper end of the first welded portion 511 is an apex which is the upper end of the outer edge in the width direction of the first welded portion 511 (hereinafter, also simply referred to as “outer edge”). The outer edge of the first welded portion 511 means a side (that is, a short side) located outside in the width direction of the first welded portion 511. The same applies to the outer edges of the second welded portion 521 and the third welded portion 531.

In the absorbent article 1, each of the plurality of first welded portions 511 may extend substantially in a straight line substantially parallel to the width direction. Even in this case, the upper end of each first welded portion 511 points to the upper end of the outer edge of each first welded portion 511, and the lower end of each first welded portion 511 is the lower end of the inner edge of each first welded portion 511. Point to.

The inner edges of the plurality of first welded portions 511 are located at substantially the same position in the width direction. The outer edges of the plurality of first welded portions 511 are also located at substantially the same position in the width direction. Each first welded portion 511 may have another shape such as a substantially oval shape. Each first welded portion 511 may be slightly curved so as to be convex upward or downward.

The plurality of second welded portions 521 each move upward toward the outside in the width direction. In the example shown in FIG. 5, each second welded portion 521 has an elongated substantially rectangular shape extending substantially linearly from the inner edge toward the diagonally upper right side in the drawing. The length of the short side of the second welded portion 521 is, for example, 0.1 mm to 1.0 mm, and is about 0.25 mm in the present embodiment. The length of the long side of the second welded portion 521 is, for example, 1.1 mm to 4.4 mm. The length of the second welded portion 521 in the width direction (that is, the left-right direction) is, for example, 1.0 mm to 4.0 mm, and is about 1.5 mm in the present embodiment. Each second welded portion 521 is arranged substantially parallel to the second welded portion 521 adjacent in the vertical direction. The plurality of second welded portions 521 are arranged in the vertical direction at substantially equal pitches. The pitch in the vertical direction of the plurality of second welded portions 521 is, for example, the vertical distance between the lower ends of each of the two second welded portions 521 adjacent to each other in the vertical direction. The pitch is substantially the same as the pitch of the plurality of first welded portions 511 described above.

The inner edges of the plurality of second welded portions 521 are located at substantially the same position in the width direction. The outer edges of the plurality of second welded portions 521 are also located at substantially the same position in the width direction. Each second welded portion 521 may have another shape such as a substantially oval shape. Further, each second welded portion 521 may be slightly curved so as to be convex upward or downward.

Each of the plurality of third welded portions 531 is directed downward toward the outside in the width direction. In the example shown in FIG. 5, each third welded portion 531 has an elongated substantially rectangular shape extending substantially linearly from the inner edge toward the lower right diagonally in the drawing. The length of the short side of the third welded portion 531 is, for example, 0.1 mm to 1.0 mm, and is about 0.25 mm in the present embodiment. The length of the long side of the third welded portion 531 is, for example, 1.1 mm to 4.4 mm. The length of the third welded portion 531 in the width direction (that is, the left-right direction) is, for example, 1.0 mm to 4.0 mm, and is about 1.5 mm in the present embodiment. Each third welded portion 531 is arranged substantially parallel to the third welded portion 531 adjacent in the vertical direction. The plurality of third welded portions 531 are arranged in the vertical direction at substantially equal pitches. The pitch in the vertical direction of the plurality of third welded portions 531 is, for example, the vertical distance between the lower ends of each of the two third welded portions 531 adjacent to each other in the vertical direction. The pitch is substantially the same as the pitch of the plurality of first welded portions 511 and the pitch of the plurality of second welded portions 521.

The inner edges of the plurality of third welded portions 531 are located at substantially the same position in the width direction. The outer edges of the plurality of third welded portions 531 are also located at substantially the same position in the width direction. Each third welded portion 531 may have another shape such as a substantially oval shape. Further, each third welded portion 531 may be slightly curved so as to be convex upward or downward.

The plurality of first welded portions 511, the plurality of second welded portions 521, and the plurality of third welded portions 531 are discontinuous with each other. In the example shown in FIG. 5, the plurality of first welded portions 511 and the plurality of second welded portions 521 are separated from each other in the width direction. Further, the plurality of second welded portions 521 and the plurality of third welded portions 531 are also separated from each other in the width direction. In other words, between the width direction of the plurality of first welded portions 511 and the plurality of second welded portions 521, a non-welded region 541 (non-welded region 541) continuously extending over substantially the entire length of the side seal portion 5 in the vertical direction. That is, a region where the welded portion does not exist) is provided. A non-welded region 542 that continuously extends over substantially the entire length of the side seal portion 5 in the vertical direction is also provided between the plurality of second welded portions 521 and the plurality of third welded portions 531 in the width direction. The width direction of the non-welded region 541 (that is, the width distance between the lower end of the outer edge of the first welded portion 511 and the upper end of the inner edge of the second welded portion 521) is, for example, 0.2 mm to 2. It is 0 mm, which is about 0.5 mm in the present embodiment. The width in the width direction of the non-welded region 542 (that is, the distance in the width direction between the lower end of the outer edge of the second welded portion 521 and the lower end of the inner edge of the third welded portion 531) is, for example, 0.2 mm to 2. It is 0 mm, which is about 0.5 mm in the present embodiment.

FIG. 6 is an enlarged front view showing a part of the side seal portion 5 shown in FIG. In the following description, each one of the first welded portions 511, the second welded portion 521, and the third welded portion 531 adjacent to each other in the width direction is referred to as a set of welded portions group 54. In each side seal portion 5, a plurality of sets of welded portions 54 are arranged in the vertical direction at substantially equal pitches. In FIG. 6, each welded portion group 54 is shown by being surrounded by a two-dot chain line. In each welded portion group 54, the first welded portion 511, the second welded portion 521, and the third welded portion 531 are arranged diagonally upward in this order toward the outside in the width direction. The pitch in the vertical direction of the plurality of sets of welded portions 54 is, for example, the vertical distance between the lower ends of the first welded portions 511 in each of the two sets of welded portions 54 adjacent to each other in the vertical direction. The pitch is substantially the same as the pitch of the plurality of first welded portions 511 described above. In the following description, the pitch of the plurality of sets of welded portions 54 is also referred to as “welded portion group pitch”.

In each welded portion group 54, the lower end of the second welded portion 521 (that is, the lower end of the inner edge) is located above the lower end of the first welded portion 511 (that is, the lower end of the inner edge). Further, the lower end of the second welded portion 521 is located at substantially the same position in the vertical direction as the upper end of the first welded portion 511 (that is, the upper end of the outer edge), or is located below the upper end of the first welded portion 511. In the example shown in FIG. 6, the lower end of the second welded portion 521 is located below the upper end of the first welded portion 511. The upper end of the second welded portion 521 (that is, the upper end of the outer edge) is located above the upper end of the first welded portion 511.

In the side seal portion 5, as shown in FIG. 7, in at least one welded portion group 54, the upper end of the first welded portion 511 (that is, the upper end of the outer edge) and the lower end of the second welded portion 521 (that is, the inner edge). It is preferable that the widthwise end portion of the body elastic element (for example, polyurethane thread) of one of the body elastic members 44 joined to the front portion 401 or the rear portion 403 passes between the lower end portion). The end portion of the body elastic element bends between the first welded portion 511 and the second welded portion 521, and is bitten by the first welded portion 511 and the second welded portion 521. Therefore, even when the body elastic element contracts in the width direction, the end portion of the body elastic element is less likely to come off from the side seal portion 5 inward in the width direction. As a result, it is possible to prevent the body elastic element from peeling off from the exterior sheet body 40 and shrinking.

Further, in the side seal portion 5, in at least one welded portion group 54, one intermediate elastic element (for example, polyurethane) of the intermediate elastic member 45 (see FIGS. 1 and 2) bonded to the front portion 401 or the rear portion 403. It is also preferable that the widthwise end portion of the yarn) passes between the upper end of the first welded portion 511 and the lower end of the second welded portion 521. As a result, the intermediate elastic element is bitten by the first welded portion 511 and the second welded portion 521 in the same manner as described above. As a result, it is possible to prevent the intermediate elastic element from peeling off from the exterior sheet body 40 and shrinking.

In each welded portion group 54, the lower end of the third welded portion 531 (that is, the lower end of the outer edge) is located above the lower end of the second welded portion 521. Further, the lower end of the third welded portion 531 is located at substantially the same position in the vertical direction as the upper end of the second welded portion 521 (that is, the upper end of the outer edge) or below the upper end of the second welded portion 521. In the example shown in FIG. 6, the lower end of the third welded portion 531 is located at substantially the same position in the vertical direction as the upper end of the second welded portion 521.

As shown in FIG. 6, in each welding portion group 54, the upper end of the third welding portion 531 (that is, the upper end of the inner edge) is located above the upper end of the second welding portion 521. Further, the upper end of the third welded portion 531 is substantially at the same position in the vertical direction as the lower end of the first welded portion 511 (that is, the lower end of the inner edge) of the other welded portion group 54 adjacent to the upper side of each welded portion group 54. Or, it is located above the lower end of the first welded portion 511 of the other welded portion group 54. In the example shown in FIG. 6, the upper end of the third welded portion 531 of each welded portion group 54 is located at substantially the same position in the vertical direction as the lower end of the first welded portion 511 of the other welded portion group 54 adjacent to the upper side. do.

FIG. 8 is a front view showing the same portion as in FIG. As shown in FIG. 8, in each welded portion group 54, the extension line 515 outward in the width direction of the first welded portion 511 intersects with the second welded portion 521. The extension line 515 is a virtual extension extending outward in the width direction from the vertical center of the outer edge (that is, the short side) of the first welded portion 511 in parallel with the inclination at the outer end portion of the first welded portion 511. Straight line. In FIG. 8, for the second welded portion group 54 from the upper side, the extension line 515 of the first welded portion 511 is shown by a two-dot chain line. The same applies to the extension lines 525 and 535 described later.

In each welded portion group 54, the extension line 525 of the second welded portion 521 outward in the width direction intersects with the third welded portion 531. The extension line 525 is from the vertical center of the side (that is, the short side) located outside the width direction of the second welding portion 521, parallel to the inclination of the second welding portion 521 at the outer end portion, and outside the width direction. It is a virtual straight line extending in the direction. In each welded portion group 54, the extension line 535 inward in the width direction of the third welded portion 531 intersects with the second welded portion 521 of the other welded portion group 54 adjacent to the lower side of each welded portion group 54. do. The extension line 535 is a virtual extension extending inward in the width direction from the vertical center of the inner edge (that is, the short side) of the third welded portion 531 in parallel with the inclination at the inner end portion of the third welded portion 531. Straight line.

FIG. 9 is a front view showing the same portion as in FIG. As shown in FIG. 9, in each welding portion group 54, the acute angle θ2 of the angle formed by the second welding portion 521 and the width direction is larger than the acute angle θ1 of the angle formed by the first welding portion 511 and the width direction. big. Further, of the angles formed by the third welded portion 531 and the width direction, the acute angle θ3 is larger than the above-mentioned θ2. θ1 is an angle formed by the extension line 515 of the first welded portion 511 and the width direction. When the first welded portion 511 extends substantially parallel to the width direction, θ1 is about 0 °. θ2 is an angle formed by the extension line 525 of the second welded portion 521 and the width direction. θ3 is an angle formed by the extension line 535 of the third welded portion 531 and the width direction.

FIG. 10 is a front view showing a part of the side seal portions 5 on both the left and right sides, omitting the central portion in the width direction of the absorbent article 1. As shown in FIG. 10, in the pair of side seal portions 5, a plurality of sets of welded portions 54 having the same shape are arranged in a left-right inverted state. In the pair of side seal portions 5, the plurality of sets of welded portions 54 of one side seal portion 5 and the plurality of sets of welded portions 54 of the other side seal portion 5 are arranged so as to be offset in the vertical direction. The amount of vertical misalignment between the welded portion group 54 of one side seal portion 5 and the welded portion group 54 of the other side seal portion 5 is approximately half of the above-mentioned welded portion group pitch.

Focusing on the first region 51 of the pair of side seal portions 5, the plurality of first welded portions 511 of one side seal portion 5 and the plurality of first welded portions 511 of the other side seal portion 5 are in the vertical direction. They are arranged alternately with respect to each other with a distance of about half the pitch of the welded part group. Focusing on the second region 52 of the pair of side seal portions 5, the plurality of second welded portions 521 of one side seal portion 5 and the plurality of second welded portions 521 of the other side seal portion 5 are They are arranged alternately in a state of being deviated by a distance equal to approximately half of the weld group pitch in the vertical direction. Focusing on the third region 53 of the pair of side seal portions 5, the plurality of third welded portions 531 of one side seal portion 5 and the plurality of third welded portions 531 of the other side seal portion 5 are in the vertical direction. They are arranged alternately with respect to each other with a distance of about half the pitch of the welded part group.

In the example shown in FIG. 10, the upper end of the third welded portion 531 of one side seal portion 5 and the lower end of the first welded portion 511, and the upper end of the second welded portion 521 and the third welded portion of the other side seal portion 5 The lower end of 531 is located at substantially the same position in the vertical direction.

FIG. 11 is a plan view showing a part of the manufacturing apparatus 8 of the absorbent article 1. FIG. 11 shows an anvil roll 81 for joining the side seal portion 5 of the absorbent article 1. In addition, FIG. 11 also shows a part of two absorbent articles 1 in the process of being arranged at a position facing the anvil roll 81 (that is, the back side in the direction perpendicular to the paper surface). The anvil roll 81 is a substantially columnar member provided with a convex portion corresponding to a plurality of sets of welded portions 54 (see FIG. 6) on the outer surface. On the outer surface of the anvil roll 81, convex portions corresponding to a plurality of sets of welded portions 54 are arranged in a circumferential shape on the right side portion and the left side portion in FIG. 11, and are convex in the central portion in the left-right direction. No part is placed. In FIG. 11, parallel diagonal lines are drawn in the region where the convex portion of the anvil roll 81 is arranged. A substantially cylindrical drum (not shown) is arranged on the opposite side of the anvil roll 81 with the absorbent article 1 in between, and a plurality of absorbent articles 1 in the process of being manufactured are continuously arranged on the outer surface of the drum. Is held in. In the present embodiment, a plurality of (for example, six) anvil rolls 81 are arranged in the circumferential direction along the outer surface of the drum at substantially equal intervals, and each of them faces the side seal portion 5 of the absorbent article 1. do. The shapes of the plurality of anvil rolls 81 are the same. Inside the drum, a plurality of ultrasonic horns arranged at positions facing the plurality of anvil rolls 81 are provided. The plurality of anvil rolls 81 rotate in synchronization with the rotation of the drum.

The plurality of absorbent articles 1 in a continuous state during manufacturing are conveyed from the right side to the left side in FIG. 11 by rotating the drum. In the plurality of absorbent articles 1, the side seal portion 5 is not joined, and the side seal portions 5 of the two absorbent articles 1 are continuous in the width direction. Since the anvil roll 81 moves together with the absorbent article 1, the relative position of the anvil roll 81 with respect to the side seal portion 5 in the circumferential direction is constant. The anvil roll 81 is pressed against the side seal portions 5 of the two absorbent articles 1 and rotates about a rotation axis oriented in the left-right direction in FIG. 11 from the lower side to the upper side in FIG. , Or move from the top to the bottom. As a result, the side seal portion 5 on the right side of the absorbent article 1 on the left side in FIG. 11 and the side seal portion 5 on the left side of the absorbent article 1 on the right side are joined by the ultrasonic seal. The side seal portion 5 of the other absorbent article 1 held on the drum is also joined by another anvil roll 81 in the same manner as described above.

As described above, in the manufacturing apparatus 8, one of the pair of side seal portions 5 of the absorbent article 1 is joined by the convex portion group on the right side of the anvil roll 81, and the other side seal portion is joined. The joining of 5 is performed by the convex portion group on the left side of the anvil roll 81.

FIG. 12 is an enlarged view showing a part of the outer surface of the anvil roll 81. In FIG. 12, of the cylindrical outer surface of the anvil roll 81, the portion on the front side in FIG. 11 is shown by being developed in a plane. Therefore, in FIG. 12, the arrangement of the convex portion described later of the anvil roll 81 is upside down from the first welded portion 511, the second welded portion 521, and the third welded portion 531 in the above-mentioned side seal portion 5. In the absorbent article 1, in the side seal portion 5 on the right side (see FIG. 6), the first welded portion 511, the second welded portion 521, and the third welded portion 531 are arranged as described above, so that the anvil roll 81 In the convex portion group 82a on the left side, the right end portion of the first convex portion 821 corresponding to the first welded portion 511 is the second in the left-right direction (hereinafter, also referred to as “axial direction”) in which the rotation axis of the anvil roll 81 extends. It partially overlaps with the second convex portion 822 corresponding to the two welded portions 521. In other words, when viewed along the axial direction, the right end portion of the first convex portion 821 partially overlaps with the second convex portion 822. Further, the right end portion of the second convex portion 822 partially overlaps with the third convex portion 823 corresponding to the third welded portion 531 in the axial direction. Further, the left end of the third convex portion 823 partially overlaps with the first convex portion 821 in the axial direction.

As described above, in the convex portion group 82a, at least one of the first convex portion 821, the second convex portion 822, and the third convex portion 823 on a straight line extending in the axial direction at any position in the circumferential direction of the anvil roll 81. There is one. In other words, in the convex portion group 82a, the first convex portion 821, the second convex portion 822, and the third convex portion 823 are continuously present over the entire circumference of the anvil roll 81. Assuming that the convex portion is interrupted in a part in the circumferential direction in the convex portion group 82a, in the anvil roll 81 that presses the side seal portion 5 while rotating, the interrupted portion of the convex portion is referred to as the side seal portion 5. The pressing force may fluctuate greatly when facing each other. In other words, the linear load of the anvil roll 81 may become 0 at the portion where the convex portion is interrupted. On the other hand, in the convex portion group 82a on the left side of the anvil roll 81 shown in FIG. 12, the first convex portion 821, the second convex portion 822, and the third convex portion 823 are continuous in the circumferential direction as described above. When joining the side seal portions 5, it is possible to prevent the pressing force of the anvil roll 81 against the side seal portions 5 from fluctuating significantly.

In the convex portion group 82b on the right side of the anvil roll 81, the left end portion of the first convex portion 821 partially overlaps with the second convex portion 822 in the axial direction, and the second convex portion group 82a is substantially similar to the convex portion group 82a on the left side. The left end of the convex portion 822 partially overlaps with the third convex portion 823 in the axial direction, and the right end portion of the third convex portion 823 partially overlaps with the first convex portion 821 in the axial direction. As described above, in the convex portion group 82b on the right side of the anvil roll 81, the first convex portion 821, the second convex portion 822, and the third convex portion 823 are continuously present over the entire circumference of the anvil roll 81. When the side seal portion 5 is joined, the pressing force of the anvil roll 81 against the side seal portion 5 is prevented from greatly fluctuating.

In the absorbent article 1, as described above, the plurality of sets of welded portions 54 of one side seal portion 5 and the plurality of sets of welded portions 54 of the other side seal portion 5 are arranged so as to be offset in the vertical direction. Will be done. Therefore, the convex portion group 82a of the anvil roll 81 is arranged so as to be displaced in the circumferential direction from the convex portion group 82b. The amount of positional deviation between the convex portion group 82a and the convex portion group 82b in the circumferential direction is approximately half of the above-mentioned welding portion group pitch. As a result, it is possible to more reliably prevent a portion where the convex portion is interrupted from occurring over the entire circumference of the anvil roll 81. As a result, when the side seal portion 5 is joined, the fluctuation of the pressing force of the anvil roll 81 with respect to the side seal portion 5 can be further suppressed.

As described above, the absorbent article 1 is a pants-type disposable absorbent article having a body opening 11 at the upper end and a pair of leg openings 12 at the lower end. The absorbent article 1 includes a front portion 401, a crotch lower portion 402, a rear portion 403, and a pair of side seal portions 5. The anterior portion 401 is located on the ventral side of the wearer. The rear portion 403 is located on the back side of the wearer. The inseam 402 is continuous with the anterior 401 and the posterior 403. The pair of side seal portions 5 are formed by joining both ends in the width direction of the front portion 401 and both ends in the width direction of the rear portion 403. Each of the pair of side seal portions 5 is a band-shaped portion extending in the vertical direction.

The pair of side seal portions 5 include a first region 51, a second region 52, and a third region 53, respectively. The first region 51 is a strip-shaped region extending in the vertical direction. The first region 51 is provided with a plurality of first welded portions 511 that are vertically arranged apart from each other. The second region 52 is a strip-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the first region 51. The second region 52 is provided with a plurality of second welded portions 521 arranged apart from each other in the vertical direction. The third region 53 is a strip-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the second region 52. The third region 53 is provided with a plurality of third welded portions 531 arranged vertically apart from each other. The plurality of first welded portions 511, the plurality of second welded portions 521, and the plurality of third welded portions 531 are discontinuous with each other.

Each of the plurality of first welded portions 511 extends in parallel in the width direction, or goes upward toward the outside in the width direction. The plurality of second welded portions 521 each move upward toward the outside in the width direction. Each of the plurality of third welded portions 531 is directed downward toward the outside in the width direction. Assuming that each one of the first welded portions 511, the second welded portion 521, and the third welded portion 531 adjacent to each other in the width direction is a set of welded portions group 54, a plurality of sets of welded portions are welded in each of the pair of side seal portions 5. The group 54 is arranged in the vertical direction.

In each of the plurality of sets of welded portions 54, the lower end of the third welded portion 531 is located above the lower end of the second welded portion 521, and the lower end of the second welded portion 521 is the lower end of the first welded portion 511. The upper end of the second welded portion 521 is located above the upper end of the first welded portion 511, and the extension line 525 of the second welded portion 521 outward in the width direction is the third welded portion 531. Crosses with.

As a result, when the side seal portion 5 is torn upward from the leg opening 12, the force applied at the start of the tear is easily transmitted outward in the width direction along the first welded portion 511, so that the side seal portion The lower end portion of 5 can be easily torn outward in the width direction. Therefore, the tearing of the side seal portion 5 can be easily started. Further, the force transmitted outward in the width direction (that is, the tearing force) by the first welding portion 511 is transmitted diagonally upward along the second welding portion 521. Therefore, the breakage of the side seal portion 5 can be easily transmitted upward.

Further, the tearing force transmitted diagonally upward toward the outside in the width direction by the second welding portion 521 reaches the third welding portion 531 and is directed diagonally upward toward the inside in the width direction by the third welding portion 531. Be converted. As a result, it is possible to prevent the tearing force transmitted by the second welding portion 521 from coming out to the outer edge in the width direction of the side seal portion 5 and interrupting the breakage of the side seal portion 5. Further, the tearing force is transmitted diagonally upward in the width direction along the third welding portion 531. Therefore, the breakage of the side seal portion 5 can be easily transmitted upward. As a result, the side seal portion 5 can be easily torn upward from the lower end.

As described above, in each of the plurality of sets of welded portions 54, the acute angle θ2 formed by the second welded portion 521 and the width direction is preferably larger than the acute angle θ1 formed by the first welded portion 511 and the width direction. .. As a result, the tearing force applied to the lower end of the side seal portion 5 from the inside in the width direction can be easily transmitted to the outside in the width direction along the first welding portion 511. Further, the tearing force transmitted by the first welded portion 511 is efficiently guided upward by the second welded portion 521. Therefore, it is possible to promote the transmission of the breakage of the side seal portion 5 upward. As a result, tearing from the lower end of the side seal portion 5 can be further facilitated.

As described above, in each of the plurality of sets of welded portions 54, the acute angle θ3 formed by the third welded portion 531 and the width direction is preferably larger than the acute angle θ2 formed by the second welded portion 521 and the width direction. .. As a result, the tearing force transmitted from the second welded portion 521 to the third welded portion 531 is released to the outer edge in the width direction of the side seal portion 5, further suppressing the interruption of the side seal portion 5 from being interrupted. Can be done. Further, the tearing force transmitted by the second welded portion 521 is efficiently guided upward by the third welded portion 531. Therefore, it is possible to promote the transmission of the breakage of the side seal portion 5 upward.

As described above, in each of the plurality of sets of welded portions 54, it is preferable that the extension line 515 of the first welded portion 511 outward in the width direction intersects with the second welded portion 521. As a result, the tearing force transmitted from the first welded portion 511 toward the outside in the width direction is easily transmitted to the second welded portion 521, and is transmitted outward from the second welded portion 521 in the width direction to the side. It is possible to prevent the seal portion 5 from coming off from the outer edge. Therefore, it is possible to promote the transmission of the breakage of the side seal portion 5 upward.

As described above, in each welded portion group 54, the extension line 535 inward in the width direction of the third welded portion 531 is the second welded portion of the other welded portion group 54 adjacent to the upper side of each welded portion group 54. It is preferable to intersect with 521. As a result, the tearing force transmitted diagonally upward from the third welded portion 531 toward the inside in the width direction is easily transmitted to the second welded portion 521 and transmitted inward in the width direction from the second welded portion 521. Therefore, it is possible to prevent the side seal portion 5 from coming off from the inner edge. Therefore, it is possible to promote the transmission of the breakage of the side seal portion 5 upward.

As described above, in each of the plurality of sets of welded portions 54, the lower end of the second welded portion 521 is at the same position in the vertical direction as the upper end of the first welded portion 511, or with respect to the upper end of the first welded portion 511. It is preferably located on the lower side. As a result, in each welded portion group 54, the first welded portion 511 and the second welded portion 521 partially overlap each other in the vertical direction, so that the bonding strength of the side seal portion 5 (that is, the front portion in the entire side seal portion 5) The joint strength between the 401 and the rear portion 403) can be increased. Further, as described above, when the side seal portion 5 is joined by the anvil roll 81 shown in FIGS. 11 and 12, the side seal of the anvil roll 81 is formed between the first convex portion 821 and the second convex portion 822. It is possible to suppress fluctuations in the pressing force on the portion 5. As a result, it is possible to suppress the occurrence of local strength in the side seal portion 5 and improve the bonding quality of the side seal portion 5.

As described above, an elastic member that is joined to the front portion 401 or the rear portion 403 along the width direction and contracts to form gathers (in the above example, the body elastic member 44 and / or the intermediate elastic member 45). The widthwise end portion preferably passes between the upper end of the first welded portion 511 and the lower end of the second welded portion 521 in the welded portion group 54 of one of a plurality of sets of welded portions 54. As a result, as shown in FIG. 7, the end portion of the elastic member is bitten by the first welded portion 511 and the second welded portion 521. As a result, it is possible to prevent the elastic member from peeling off from the exterior sheet body 40 and shrinking. As described above, when the side seal portion 5 is joined by the ultrasonic seal, the elastic member easily moves to a position where the welded portion is avoided due to the ultrasonic vibration at the time of joining. Therefore, the end portion of the elastic member is easily bitten by the first welded portion 511 and the second welded portion 521.

As described above, in each of the plurality of sets of welded portions 54, the lower end of the third welded portion 531 is at the same position in the vertical direction as the upper end of the second welded portion 521, or the upper end of the second welded portion 521. It is preferably located on the lower side. As a result, in each welded portion group 54, the second welded portion 521 and the third welded portion 531 partially overlap each other in the vertical direction, so that the bonding strength of the side seal portion 5 can be increased. Further, as described above, when the side seal portion 5 is joined by the anvil roll 81, the pressing force of the anvil roll 81 against the side seal portion 5 varies between the second convex portion 822 and the third convex portion 823. Can be suppressed. As a result, it is possible to suppress the occurrence of local strength in the side seal portion 5 and improve the bonding quality of the side seal portion 5.

As described above, in each welded portion group 54, the upper end of the third welded portion 531 is in the vertical direction with the lower end of the first welded portion 511 of the other welded portion group 54 adjacent to the upper side of each welded portion group 54. It is preferably located at the same position or above the lower end of the first welded portion 511 of the other welded portion group 54. As a result, in each of the two welded portions 54 adjacent to each other in the vertical direction, the third welded portion 531 and the first welded portion 511 partially overlap each other in the vertical direction, so that the bonding strength of the side seal portion 5 is increased. Can be done. Further, as described above, when the side seal portion 5 is joined by the anvil roll 81, the pressing force of the anvil roll 81 against the side seal portion 5 varies between the third convex portion 823 and the first convex portion 821. Can be suppressed. As a result, it is possible to suppress the occurrence of local strength in the side seal portion 5 and improve the bonding quality of the side seal portion 5.

As described above, between the width direction of the plurality of first welded portions 511 and the plurality of second welded portions 521, and between the width directions of the plurality of second welded portions 521 and the plurality of third welded portions 531. It is preferable that each of the above is provided with non-welded regions 541 and 542 which are continuously extended in the vertical direction. As a result, it is possible to prevent the total area of the welded portions in the side seal portion 5 from becoming excessive, and it is possible to suppress the amount of heat input to the side seal portion 5 from becoming excessive. As a result, the joining quality of the side seal portion 5 can be improved. In addition, the side seal portion 5 can be easily torn in the vertical direction. Further, the flexibility of the side seal portion 5 can be improved, and the inner feel of the side seal portion 5 in contact with the waist portion of the wearer can be improved. Further, in the anvil roll 81 of the above-mentioned manufacturing apparatus 8, an appropriate gap is provided between the first convex portion 821 and the second convex portion 822, and between the second convex portion 822 and the third convex portion 823. Therefore, the production of the anvil roll 81 can be facilitated.

As described above, it is preferable that the plurality of first welded portions 511 are arranged at equal pitches in the vertical direction. Further, it is preferable that the plurality of second welded portions 521 are also arranged at equal pitches in the vertical direction. Further, it is preferable that the plurality of third welded portions 531 are also arranged at equal pitches in the vertical direction. As a result, the joint strength of the side seal portion 5 can be equalized in the vertical direction. As a result, it is possible to prevent the side seal portion 5 from breaking unintentionally in a part in the vertical direction.

As described above, in the pair of side seal portions 5, the plurality of first welded portions 511 of one side seal portion 5 and the plurality of first welded portions 511 of the other side seal portion 5 alternate in the vertical direction. It is preferable to be arranged. Further, it is preferable that the plurality of second welded portions 521 of one side seal portion 5 and the plurality of second welded portions 521 of the other side seal portion 5 are alternately arranged in the vertical direction. Further, it is preferable that the plurality of third welded portions 531 of one side seal portion 5 and the plurality of third welded portions 531 of the other side seal portion 5 are alternately arranged in the vertical direction. As a result, as described above, it is possible to further suppress fluctuations in the pressing force of the anvil roll 81 against the side seal portion 5 when the side seal portion 5 is joined by the anvil roll 81. As a result, the joining quality of the side seal portion 5 can be further improved.

From the viewpoint of suppressing fluctuations in the pressing force on the side seal portion 5 of the anvil roll 81, the welding portion group 54 of one side seal portion 5 and the welding portion group 54 of the other side seal portion 5 are in the vertical direction. The amount of misalignment is preferably equal to approximately half of the above-mentioned weld group pitch. Further, the upper end of the third welded portion 531 and the lower end of the first welded portion 511 of one side seal portion 5 and the upper end of the second welded portion 521 and the lower end of the third welded portion 531 of the other side seal portion 5 It is also preferable that they are located at substantially the same position in the vertical direction.

Various modifications can be made in the absorbent article 1 and the manufacturing apparatus 8 described above.

For example, the plurality of sets of welded portions 54 of one side seal portion 5 and the plurality of sets of welded portions 54 of the other side seal portion 5 may be arranged at the same height in the vertical direction.

The plurality of first welded portions 511 do not necessarily have to be arranged at equal pitches. Further, the plurality of second welded portions 521 do not necessarily have to be arranged at equal pitches. The plurality of third welded portions 531 do not necessarily have to be arranged at equal pitches.

The non-welded region 541 between the plurality of first welded portions 511 and the plurality of second welded portions 521 may be omitted. The non-welded region 542 between the plurality of second welded portions 521 and the plurality of third welded portions 531 may also be omitted.

Even if the upper end of the third welded portion 531 of one welded portion group 54 is located below the lower end of the first welded portion 511 of the other welded portion group 54 adjacent to the upper side of the welded portion group 54. good.

In one welded portion group 54, the lower end of the third welded portion 531 may be located above the upper end of the second welded portion 521. Further, the lower end of the second welded portion 521 may be located above the upper end of the first welded portion 511. The ends of the body elastic member 44 and the intermediate elastic member 45 do not have to pass between the upper end of the first welded portion 511 and the lower end of the second welded portion 521 in one welded portion group 54.

In one welding portion group 54, the extension line 535 inward in the width direction of the third welding portion 531 does not have to intersect with the second welding portion 521.

In one welding portion group 54, the acute angle θ3 formed by the third welding portion 531 and the width direction may be equal to or less than the acute angle θ2 formed by the second welding portion 521 and the width direction. Further, the acute angle θ2 may be equal to or less than the acute angle θ1 formed by the first welded portion 511 and the width direction.

The side seal portion 5 may be provided with a plurality of other welded portions arranged in the vertical direction inside the first region 51 in the width direction. Further, a plurality of other welded portions arranged in the vertical direction may be provided outside the third region 53 in the width direction.

The first welded portion 511 may be divided into a plurality of elements at arbitrary positions in the width direction. The same applies to the second welded portion 521 and the third welded portion 531.

In the manufacturing apparatus 8, the side seal portion 5 may be joined by heat sealing by the anvil roll 81. Further, the method of joining the side seal portion 5 is not limited to the one using the anvil roll 81 and the drum, and may be variously changed.

The absorbent article 1 may be a pants-type disposable diaper for children. Further, the structure of the absorbent article 1 described above may be used for a pants-type disposable absorbent article other than the disposable diaper.

The above-described embodiments and configurations in the respective modifications may be appropriately combined as long as they do not conflict with each other.

1 Absorbent article 5 Side seal part 11 Body opening 12 Leg opening 44 Body elastic member 45 Intermediate elastic member 51 1st area 52 2nd area 53 3rd area 54 Welding part group 401 Front part 402 Inseam 403 Rear part 511 First welded part 515,525,535 Extension line 521 Second welded part 531 Third welded part 541,542 Non-welded area θ1, θ2, θ3 Acute angle

The invention according to claim 1 is a pants-type disposable absorbent article having a body opening at the upper end and a pair of leg openings at the lower end, and has a front portion located on the ventral side of the wearer. The rear portion located on the back side of the wearer, the front portion and the crotch portion continuous from the rear portion, and both ends in the width direction of the front portion and both ends in the width direction of the rear portion are joined. Each of the pair of side seal portions is a strip-shaped region extending in the vertical direction, and each of the pair of side seal portions is separated from each other in the vertical direction. A first region provided with a plurality of first welded portions to be arranged, and a strip-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the first region, and a plurality of regions arranged in the vertical direction separated from each other. A second region in which the second welding portion is provided, and a band-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the second region, and a plurality of third welding regions arranged apart from each other in the vertical direction. The plurality of first welded portions, the plurality of second welded portions, and the plurality of third welded portions are discontinuous with each other, and the plurality of first welded portions are each provided with a third region provided with portions. , Extending parallel to the width direction, or upward toward the outside in the width direction, and each of the plurality of second welding portions upwards toward the outside in the width direction, and the plurality of third welding portions. The portions are directed downward toward the outside in the width direction, and if each one of the first welding portions, the second welding portions, and the third welding portions adjacent to each other in the width direction is a set of welding portions, a pair of portions is formed. In each of the side seal portions, a plurality of sets of welded portions are arranged in the vertical direction, and in each of the plurality of sets of welded portions, the lower end of the third welded portion is larger than the lower end of the second welded portion. Located on the upper side, the lower end of the second welded portion is located above the lower end of the first welded portion, and the upper end of the second welded portion is located above the upper end of the first welded portion. The extension line of the second welded portion outward in the width direction intersects the third welded portion, and in each of the plurality of sets of welded portions, the sharp angle formed by the third welded portion and the width direction is the first. 2 It is larger than the sharp angle formed by the welded part and the width direction.

The invention according to claim 2 is a pants-type disposable absorbent article having a body opening at the upper end and a pair of leg openings at the lower end, and has a front portion located on the ventral side of the wearer. The rear portion located on the back side of the wearer, the front portion and the crotch portion continuous from the rear portion, and both ends in the width direction of the front portion and both ends in the width direction of the rear portion are joined. Each of the pair of side seal portions is a strip-shaped region extending in the vertical direction, and each of the pair of side seal portions is separated from each other in the vertical direction. A first region provided with a plurality of first welded portions to be arranged, and a strip-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the first region, and a plurality of regions arranged in the vertical direction separated from each other. A second region in which the second welding portion is provided, and a band-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the second region, and a plurality of third welding regions arranged apart from each other in the vertical direction. The plurality of first welded portions, the plurality of second welded portions, and the plurality of third welded portions are discontinuous with each other, and the plurality of first welded portions are each provided with a third region provided with portions. , Extending parallel to the width direction, or upward toward the outside in the width direction, and each of the plurality of second welding portions upwards toward the outside in the width direction, and the plurality of third welding portions. The portions are directed downward toward the outside in the width direction, and if each one of the first welding portions, the second welding portions, and the third welding portions adjacent to each other in the width direction is a set of welding portions, a pair of portions is formed. In each of the side seal portions, a plurality of sets of welded portions are arranged in the vertical direction, and in each of the plurality of sets of welded portions, the lower end of the third welded portion is larger than the lower end of the second welded portion. Located on the upper side, the lower end of the second welded portion is located above the lower end of the first welded portion, and the upper end of the second welded portion is located above the upper end of the first welded portion. The extension line of the second welded portion outward in the width direction intersects the third welded portion, and is between the plurality of first welded portions and the plurality of second welded portions in the width direction, and the plurality of said. A non-welded region extending continuously in the vertical direction is provided in each of the width direction between the second welded portion and the plurality of third welded portions.

The invention according to claim 3 is a pants-type disposable absorbent article having a body opening at the upper end and a pair of leg openings at the lower end, and has a front portion located on the ventral side of the wearer. The rear portion located on the back side of the wearer, the front portion and the crotch portion continuous from the rear portion, and both ends in the width direction of the front portion and both ends in the width direction of the rear portion are joined. Each of the pair of side seal portions is a strip-shaped region extending in the vertical direction, and each of the pair of side seal portions is separated from each other in the vertical direction. A first region provided with a plurality of first welded portions to be arranged, and a strip-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the first region, and a plurality of regions arranged in the vertical direction separated from each other. A second region in which the second welding portion is provided, and a band-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the second region, and a plurality of third welding regions arranged apart from each other in the vertical direction. The plurality of first welded portions, the plurality of second welded portions, and the plurality of third welded portions are discontinuous with each other, and the plurality of first welded portions are each provided with a third region provided with portions. , Extending parallel to the width direction, or upward toward the outside in the width direction, and each of the plurality of second welding portions upwards toward the outside in the width direction, and the plurality of third welding portions. The portions are directed downward toward the outside in the width direction, and if each one of the first welding portions, the second welding portions, and the third welding portions adjacent to each other in the width direction is a set of welding portions, a pair of portions is formed. In each of the side seal portions, a plurality of sets of welded portions are arranged in the vertical direction, and in each of the plurality of sets of welded portions, the lower end of the third welded portion is larger than the lower end of the second welded portion. Located on the upper side, the lower end of the second welded portion is located above the lower end of the first welded portion, and the upper end of the second welded portion is located above the upper end of the first welded portion. The extension line of the second welded portion outward in the width direction intersects the third welded portion, and in the pair of side seal portions, the plurality of first welded portions of one side seal portion and the other side seal portion. The plurality of first welded portions are arranged alternately in the vertical direction, and the plurality of second welded portions of the one side seal portion and the plurality of second welded portions of the other side seal portion are , Alternately arranged in the vertical direction, in front of the plurality of third welded portions of the one side seal portion and the other side seal portion. The plurality of third welded portions are arranged alternately in the vertical direction.
The invention according to claim 4 is the disposable absorbent article according to any one of claims 1 to 3, wherein the lower end of the second welded portion is formed in each of the plurality of sets of welded portions. It is located at the same position in the vertical direction as the upper end of the first welded portion, or below the upper end of the first welded portion.
The invention according to claim 5 is the disposable absorbent article according to claim 4, which is an elastic member which is joined to the front portion or the rear portion along the width direction and shrinks to form gathers. The widthwise end of the elastic member passes between the upper end of the first welded portion and the lower end of the second welded portion in one of the plurality of welded portions. do.
The invention according to claim 6 is a pants-type disposable absorbent article having a body opening at the upper end and a pair of leg openings at the lower end, and has a front portion located on the ventral side of the wearer. The rear portion located on the back side of the wearer, the crotch portion continuous from the front portion and the rear portion, and both ends in the width direction of the front portion and both ends in the width direction of the rear portion are joined. Each of the pair of side seal portions is a strip-shaped region extending in the vertical direction, which is separated from each other in the vertical direction. A first region provided with a plurality of first welded portions to be arranged, and a strip-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the first region, and a plurality of regions arranged in the vertical direction separated from each other. A second region in which the second welding portion of the above is provided, and a band-shaped region extending in the vertical direction adjacent to the outer side in the width direction of the second region, and a plurality of third welding regions arranged vertically apart from each other. The plurality of first welded portions, the plurality of second welded portions, and the plurality of third welded portions are discontinuous with each other, and the plurality of first welded portions are each provided with a third region provided with portions. , Extending parallel to the width direction, or upward toward the outside in the width direction, and each of the plurality of second welding portions upwards toward the outside in the width direction, and the plurality of third welding portions. The portions are directed downward toward the outside in the width direction, and if each one of the first welding portions, the second welding portions, and the third welding portions adjacent to each other in the width direction is a set of welding portions, a pair of portions is formed. In each of the side seal portions, a plurality of sets of welded portions are arranged in the vertical direction, and in each of the plurality of sets of welded portions, the lower end of the third welded portion is higher than the lower end of the second welded portion. Located on the upper side, the lower end of the second welded portion is located above the lower end of the first welded portion, and the upper end of the second welded portion is located above the upper end of the first welded portion. The extension line of the second welded portion outward in the width direction intersects the third welded portion, and in each of the plurality of sets of welded portions, the lower end of the second welded portion is the upper end of the first welded portion. Elasticity that is located at the same position in the vertical direction or below the upper end of the first welded portion, and is joined to the front portion or the rear portion along the width direction and contracts to form gathers. A member is further provided, and the widthwise end portion of the elastic member is above the first welded portion in the welded portion group of one of the plurality of welded portions. It passes between the end and the lower end of the second welded portion.
The invention according to claim 7 is the disposable absorbent article according to any one of claims 1 to 6, wherein the second welded portion and the width direction are used in each of the plurality of sets of welded portions. The acute angle formed by is larger than the acute angle formed by the first welded portion and the width direction.
The invention according to claim 8 is the disposable absorbent article according to any one of claims 1 to 7, and is outside the width direction of the first welded portion in each of the plurality of sets of welded portions. The extension line toward the direction intersects the second welded portion.
The invention according to claim 9 is the disposable absorbent article according to any one of claims 1 to 8, and is an extension line inward in the width direction of the third welded portion in each welded portion group. Crosses the second welded portion of another welded portion group adjacent to the upper side of each welded portion group.
The invention according to claim 10 is the disposable absorbent article according to any one of claims 1 to 9, wherein in each of the plurality of sets of welded portions, the lower end of the third welded portion is. It is located at the same position in the vertical direction as the upper end of the second welded portion, or below the upper end of the second welded portion.
The invention according to claim 11 is the disposable absorbent article according to any one of claims 1 to 10, wherein in each welding section group, the upper end of the third welding section is the welding section group. It is located at the same position in the vertical direction as the lower end of the first welded portion of the other welded portion group adjacent to the upper side of the above, or above the lower end of the first welded portion of the other welded portion group.
The invention according to claim 12 is the disposable absorbent article according to any one of claims 1 to 11, wherein the plurality of first welded portions are arranged at equal pitches in the vertical direction, and the plurality of first welded portions are arranged at equal pitches in the vertical direction. The second welded portions are arranged at equal pitches in the vertical direction, and the plurality of third welded portions are arranged at equal pitches in the vertical direction.

Claims (12)

A pants-type disposable absorbent article with a torso opening at the top and a pair of leg openings at the bottom.
The anterior part located on the ventral side of the wearer,
The rear part located on the back side of the wearer and
The inseam continuous from the anterior portion and the posterior portion,
A pair of side seal portions, which are formed by joining both ends in the width direction of the front portion and both ends in the width direction of the rear portion and are strip-shaped portions extending in the vertical direction, respectively.
Equipped with
Each pair of side seals
A band-shaped region extending in the vertical direction, and a first region provided with a plurality of first welded portions arranged in the vertical direction separated from each other.
A band-shaped region adjacent to the outer side in the width direction of the first region and extending in the vertical direction, and a second region provided with a plurality of second welded portions arranged in the vertical direction separated from each other.
A band-shaped region adjacent to the outer side in the width direction of the second region and extending in the vertical direction, and a third region provided with a plurality of third welded portions arranged in the vertical direction separated from each other.
Equipped with
The plurality of first welded portions, the plurality of second welded portions, and the plurality of third welded portions are discontinuous with each other.
Each of the plurality of first welded portions extends in parallel in the width direction, or upwards toward the outside in the width direction.
Each of the plurality of second welded portions is directed upward in the outward direction in the width direction.
Each of the plurality of third welded portions is directed downward toward the outside in the width direction.
Assuming that one first welded portion, the second welded portion, and the third welded portion adjacent to each other in the width direction are one set of welded portions, a plurality of sets of welded portions are arranged in the vertical direction in each of the pair of side seal portions. Are arranged in
In each of the plurality of sets of welded portions, the lower end of the third welded portion is located above the lower end of the second welded portion, and the lower end of the second welded portion is located above the lower end of the first welded portion. Located on the upper side, the upper end of the second welded portion is located above the upper end of the first welded portion, and the extension line of the second welded portion outward in the width direction intersects the third welded portion. Disposable absorbent article characterized by that. The disposable absorbent article according to claim 1.
A disposable absorbent article characterized in that, in each of the plurality of sets of welded portions, the acute angle formed by the second welded portion and the width direction is larger than the acute angle formed by the first welded portion and the width direction. The disposable absorbent article according to claim 1 or 2.
A disposable absorbent article characterized in that, in each of the plurality of sets of welded portions, the acute angle formed by the third welded portion and the width direction is larger than the acute angle formed by the second welded portion and the width direction. The disposable absorbent article according to any one of claims 1 to 3.
A disposable absorbent article characterized in that, in each of the plurality of sets of welded portions, an extension line of the first welded portion outward in the width direction intersects with the second welded portion. The disposable absorbent article according to any one of claims 1 to 4.
In each welded portion group, the extension line inward in the width direction of the third welded portion intersects with the second welded portion of another welded portion group adjacent to the upper side of each welded portion group. Disposable absorbent goods. The disposable absorbent article according to any one of claims 1 to 5.
In each of the plurality of sets of welded portions, the lower end of the second welded portion is located at the same position in the vertical direction as the upper end of the first welded portion, or below the upper end of the first welded portion. Disposable absorbent article characterized by that. The disposable absorbent article according to claim 6.
Further provided with an elastic member that is joined to the front portion or the rear portion along the width direction and forms gathers by contracting.
The widthwise end of the elastic member passes between the upper end of the first welded portion and the lower end of the second welded portion in one of the plurality of welded portions. Disposable absorbent goods. The disposable absorbent article according to any one of claims 1 to 7.
In each of the plurality of sets of welded portions, the lower end of the third welded portion is located at the same position in the vertical direction as the upper end of the second welded portion, or below the upper end of the second welded portion. Disposable absorbent article characterized by that. The disposable absorbent article according to any one of claims 1 to 8.
In each welded portion group, the upper end of the third welded portion is at the same position in the vertical direction as the lower end of the first welded portion of another welded portion group adjacent to the upper side of each welded portion group, or the other A disposable absorbent article characterized in that it is located above the lower end of the first welded portion of the welded portion group. The disposable absorbent article according to any one of claims 1 to 9.
Up and down in the width direction between the plurality of first welded portions and the plurality of second welded portions, and between the widthwise directions of the plurality of second welded portions and the plurality of third welded portions. A disposable absorbent article characterized by a non-welded region that extends continuously in the direction. The disposable absorbent article according to any one of claims 1 to 10.
The plurality of first welded portions are arranged in the vertical direction at equal pitches.
The plurality of second welded portions are arranged in the vertical direction at equal pitches.
A disposable absorbent article characterized in that the plurality of third welded portions are arranged at equal pitches in the vertical direction. The disposable absorbent article according to any one of claims 1 to 11.
In the pair of side seal portions,
The plurality of first welded portions of one side seal portion and the plurality of first welded portions of the other side seal portion are alternately arranged in the vertical direction.
The plurality of second welded portions of the one side seal portion and the plurality of second welded portions of the other side seal portion are arranged alternately in the vertical direction.
A disposable absorbent article characterized in that the plurality of third welded portions of the one side seal portion and the plurality of third welded portions of the other side seal portion are arranged alternately in the vertical direction.

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