JP5946172B2 - Pants-type absorbent article - Google Patents

Description

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

Conventionally, an abdominal side portion disposed on the wearer's ventral side, a crotch portion disposed on the wearer's crotch portion, an hourglass-like outer covering material extending over the back side portion disposed on the wearer's back side, and the outer packaging An absorptive main body fixed to the inner surface side of the material, and both a side edge of the outer packaging material on the abdominal side and a side edge of the outer packaging material on the back side are joined to each other, and a waist opening and a pair of leg openings A pants-type absorbent article in which is formed is known.
When such a pants-type absorbent article is continuously produced, it is common to form a through hole or notch for forming a leg opening in the belt-shaped raw material of the outer packaging material and remove unnecessary portions as trims. It is.

In addition, as a conventional pants-type absorbent article, the outer packaging material is divided into an abdominal sheet member disposed on the wearer's belly side and a back sheet member disposed on the wearer's back side, The pants in which the absorbent main body is fixed so as to span the abdominal sheet member and the back sheet member, and the left and right side parts of the abdominal sheet member are joined to the left and right side parts of the back side sheet member Type absorbent articles are known.
For example, Patent Document 1 includes, as such a pant-type absorbent article, an annular elastic belt composed of a front belt portion and a rear belt portion and an absorbent main body, and a longitudinal portion of the rear belt portion (back side seat member). A pull-on garment is described in which the length in the direction is longer than the length in the longitudinal direction of the front belt portion (ventral side seat member).

  Further, Patent Document 2 includes a cylindrical waistline portion and an absorbent main body formed from a ventral side exterior sheet and a backside exterior sheet, and the backside exterior sheet extends downward from the cylindrical waistline portion. A pants-type paper diaper having a portion to be described is described, and the publication discloses that the ventral-side exterior sheet may also have a portion extending downward from the cylindrical waistline portion.

  Further, the outer packaging material is not a disposable diaper divided into front and rear, but in Patent Document 3, the length of the rear waistline region arranged on the back side of the wearer is made longer than the length of the front waistline region, A pants-type diaper is described in which the rear waistline region extends upward from the upper end edge of the front waistline region.

Special table 2008-508082 JP 2008-178682 A Japanese Patent Laid-Open No. 10-127689

  The pants-type absorbent article in which the outer packaging material is divided into an abdominal sheet member disposed on the wearer's ventral side and a dorsal sheet member disposed on the wearer's dorsal side is, for example, an abdominal sheet member While the belt-shaped original fabric and the belt-shaped original fabric of the back side sheet member are transported apart, the absorbent main body is intermittently fixed so as to be bridged between the two, and then the belt-shaped original fabric of the ventral side sheet member After folding in half so that the belt-like raw material of the back side sheet member overlaps, it is joined by forming the side seal part, and at the same time or after that, it is cut and divided into individual disposable diapers. Compared to the case where a through hole or a notch for forming a leg opening is formed in a wide outer packaging material in which a portion arranged on the ventral side and a portion arranged on the back side can be manufactured, Trims that do not require or need to be removed from the outer packaging material It can be made of miniaturization.

However, in the pull-on garment described in Patent Document 1, the rear belt portion (back side seat member) is longer than the front belt portion (abdominal side seat member), but the position of the upper edge of the rear belt portion and the upper end of the front belt portion. Since the position of the edge is the same, it is not easy to distinguish the front and back with the form alone.To distinguish between the front and back, a pattern or display is attached to either the front or back, and the color of the elastic body is different between the front and back. It was necessary to devise it. The pants-type paper diaper of Patent Document 2 has the same problem.
The pant-type diaper described in Patent Document 3 can be distinguished before and after due to the difference in form, but the rear waistline region located on the back side extends upward from the front waistline portion located on the abdomen side. For this reason, there has been a problem that it is difficult to wear the diaper waist opening with both hands while putting the leg through the leg opening and then lifting the diaper.

  Therefore, according to the present invention, the outer packaging material is divided into an abdominal sheet member and a dorsal sheet member, and is a pant-type absorbent article that can be manufactured efficiently, but it is easy to discriminate before and after the form. The present invention relates to a pants-type absorbent article that can be smoothly worn while grasping the upper part of the side part by hand.

  The present invention is fixed over the abdominal sheet member disposed on the abdomen side of the wearer, the dorsal sheet member disposed on the dorsal side of the wearer, and the abdomen sheet member and the dorsal sheet member. A pant-type absorbent article comprising an absorptive main body, wherein both sides of the abdominal sheet member and both sides of the back sheet member are joined to form a cylindrical waistline, The length of the absorbent article in the longitudinal direction of the absorbent article is equal to or greater than the length of the back sheet member in the same direction, and the ventral sheet member and the back sheet member are A pants-type absorbent article that extends upward from the upper end edge and is joined so that the back side sheet member extends downward from the lower end edge of the abdominal side sheet member is provided.

  The pants-type absorbent article of the present invention is a pants-type absorbent article whose outer packaging material is divided into a ventral sheet member and a dorsal sheet member and can be manufactured efficiently. Yes, it can be worn smoothly while grasping the upper part of the ventral part by hand.

FIG. 1 is a perspective view showing a usage state (wearing state) of a pants-type disposable diaper according to an embodiment of the present invention. FIG. 2 is a partially broken plan view showing a developed and extended state of the pants-type disposable diaper shown in FIG. In the expanded and extended state, the joints (side seal portions) existing on both sides of the diaper are peeled off to make the pant-type absorbent article in the expanded state, and the expanded absorbent article is stretched with the elastic members in each part. It is a state where it is expanded to the design dimension (same as the dimension when it is expanded in a flat shape with no influence of the elastic member). FIG. 3 is a plan view showing a folded state in which the abdomen and the back of the pants-type disposable diaper shown in FIG. 1 are in contact with each other. FIG. 4 is a side view of the pants-type disposable diaper in the state shown in FIG. 3 as viewed from the side. FIG. 5 is an explanatory diagram of a method for measuring shrinkage stress.

Hereinafter, the underpants type absorbent article of the present invention will be described based on preferred embodiments with reference to the drawings.
A pants-type disposable diaper 1 (hereinafter, also referred to as diaper 1) according to an embodiment of the present invention, as shown in FIG. 1 and FIG. A back side seat member 2B arranged on the back side of the person, and an absorptive sheet member 2A and an absorbent main body 3 fixed over the back side seat member 2B. And both side portions of the back seat member 2B are joined at the respective side edge portions 2a and 2b to form a cylindrical waistline portion D. The ventral sheet member 2A and the dorsal sheet member 2B are rectangular in the state shown in FIG. 2 (deployed and extended state).

  As shown in FIG. 1 and FIG. 2, the diaper 1 is, when worn, an abdominal side A disposed on the abdomen side of the wearer, a dorsal side B disposed on the back side of the wearer, and an abdomen side part. It has a crotch part C which is located between A and the back side part B and is arranged in a wearer's crotch part. The longitudinal direction of the diaper (absorbent article) is the direction from the abdominal side A to the back side B through the crotch C, or the opposite direction (X direction in FIG. 2), and the width of the diaper (absorbent article). Direction), a direction along the waistline direction of the wearer, and a direction (Y direction in FIG. 2) intersecting the longitudinal direction of the absorbent article. Hereinafter, the longitudinal direction of the diaper (the longitudinal direction of the article) is also simply referred to as the X direction, and the width direction of the diaper (the article width direction) is also simply referred to as the Y direction.

In the diaper 1 of the present embodiment, the ventral seat member 2A has the same length La in the X direction as the length Lb in the same direction of the back seat member 2B.
More specifically, the ventral sheet member 2A has a horizontally long rectangular shape when the diaper 1 is deployed and extended (see FIG. 2), and a pair of left and right sides along the diaper longitudinal direction (X direction). It has edge part 2a, 2a, upper end edge Au and lower end edge Ad which follow a diaper width direction (Y direction). Similarly, the back seat member 2B has a horizontally long rectangular shape when the diaper 1 is unfolded and extended (see FIG. 2), and a pair of left and right side edges 2b and 2b along the X direction, and the diaper width. It has an upper end edge Bu and a lower end edge Bd along the direction (Y direction).
The abdominal sheet member 2A and the back sheet member 2B have the same lengths La and Lb in the X direction, and, as shown in FIG. 2, the length in the diaper longitudinal direction (X direction) is the diaper width direction ( Uniform in the Y direction).

Then, the side edge portion 2a of the ventral seat member 2A (specifically, a joint portion 2a ′ that is a part thereof) and the side edge portion 2b of the back side seat member 2B (specifically, a joint that is a part thereof). The pair of side seal portions 4 and 4 are formed on the diaper 1 by joining the portion 2b ′).
As shown in FIG. 2, the side seal portion 4 is formed such that the length in the X direction is shorter than both the length La of the abdominal seat member 2A and the length Lb of the back seat member 2B. The side seal portion 4 is joined to the abdomen seat member 2A and the back seat member 2B by shifting the positions of their upper end edges Au and Bu in the X direction as shown in FIGS. ing.

Therefore, as shown in FIGS. 1 and 3, the ventral sheet member 2 </ b> A has an upward extending portion E that extends upward from the upper end edge Bu of the backside sheet member 2 </ b> B, and the backside sheet member 2 </ b> B has A downward extending portion F extending downward from the lower end edge Au of the ventral sheet member 2A is generated.
The abdominal sheet member 2A has side seal portions 4 and 4 on both the left and right sides, and a ventral waistline forming portion 20a that forms the abdominal side portion of the cylindrical waistline D described above. Extending from the waistline portion forming portion 20a to the crotch portion C side, an abdominal side extending portion 21a having no side seal portions 4 and 4 is formed on both the left and right sides.
Further, the back side seat member 2B also includes a back side waistline forming portion 20b having side seal portions 4 and 4 on both left and right sides and forming the back side portion of the cylindrical waistline portion D described above, Extending from the waistline portion forming portion 20b to the crotch portion C side, a back side extending portion 21b having no side seal portions 4 and 4 is formed on both the left and right sides.

  As described above, in the diaper 1 of the present embodiment, the abdominal sheet member 2A and the back sheet member 2B have the same lengths La and Lb in the X direction. The length Le (see FIG. 3) and the length Lf (see FIG. 3) of the downward extension F in the X direction are the same length.

As for the absorptive main body 3, the one end side (part which overlaps the ventral sheet member 2A) of the longitudinal direction is fixed to the center area | region of the Y direction of the ventral sheet member 2A via an adhesive agent, and the other of the longitudinal direction is the other. The end side (portion overlapping with the back sheet member 2B) is fixed to the central region in the Y direction of the back sheet member 2B via an adhesive.
The absorptive main body 3 includes an absorber 33 that absorbs and holds liquid such as urine discharged from the body. Although the structure of the absorptive main body 3 is not particularly limited other than including the absorber 33, the absorptive main body 3 in the diaper 1 of the present embodiment will be described more specifically as a preferred example of the absorptive main body of the present invention. To do.

  As shown in FIG. 2, the absorbent main body 3 includes a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32, and a liquid-retaining absorption disposed between the sheets 31 and 32. It has a body 33 and is formed in a rectangular shape that is long in the X direction. The absorbent body 33 is composed of an absorbent core made of an aggregate of fibers such as pulp fibers (may be a non-woven fabric) or an absorbent core in which water-absorbing polymer particles are held, and the absorbent core covered. A core wrap sheet (not shown). The absorber 33 is also formed in a rectangular shape that is long in the X direction. The absorbent body 33 in the illustrated example has low-rigidity portions 33d on both sides in the longitudinal direction, where there is no absorbent core forming material or the basis weight of the forming material is smaller than other portions. Since the absorber 33 is easily bent at the low-rigidity portion 33d, both sides of the absorber 33 or the absorbent main body 3 are easily raised toward the wearer's skin when the diaper is worn.

  Side cuffs 34 and 34 made of a liquid-resistant or water-repellent and breathable material are formed on both sides in the longitudinal direction of the absorbent main body 3. In the vicinity of the free end of each side cuff 34, a side cuff elastic member 35 is arranged in an extended state. During wearing of the diaper 1, the side cuff 34 is raised by contraction of the side cuff elastic member 35, and the outflow of liquid from the absorbent main body 3 to the outside in the width direction is prevented. As the absorptive core and core wrap sheet of the top sheet 31, the back sheet 32, and the absorber 33, the same ones conventionally used for this type of absorbent article can be used.

  As shown in FIG. 2, the ventral sheet member 2 </ b> A and the back sheet member 2 </ b> B in the diaper 1 both have an outer layer sheet 22 that forms the outer surface of the diaper, an inner layer sheet 23 disposed on the inner surface side of the outer layer sheet 22, And a plurality of thread-like elastic members 24 arranged between the sheets 22 and 23 along the X direction. The waistline stretchable part 20a and the backside waistline formed part 20b are respectively stretched around the waistline. A part G2 is formed, an upper extension part E1 is formed in the upper extension part E of the abdominal sheet member 2A, and a lower extension part is provided in each of the abdominal extension part 21a and the back side extension part 21b. An elastic part G3 is formed. A part of the lower extension part G3 of the lower extension part 21b exists in the lower extension part F described above, and the remaining part is above the lower extension part F of the rear extension part 21b. It is formed in the part of.

  According to the diaper 1 of the present embodiment, the ventral sheet member 2A has the upper extending portion E that extends upward from the upper end edge Bu of the back sheet member 2B. Is possible. The ability to discriminate between the front and the rear from the difference in form has the advantage that the discrimination is easy even in a dark room. In addition, there are merits such that it is not necessary to attach a pattern or display for front / rear discrimination, or to change the color of the elastic body for front / rear discrimination. In the present invention, for the purpose of facilitating the discrimination before and after and improving the design, such a pattern or display may be added, or the color of the elastic body may be changed.

  Moreover, according to the diaper 1 of this embodiment, since such an upward extension part E is formed in the abdominal sheet member 2A arranged on the abdomen side of the wearer, the upper side of the abdominal sheet member 2A. While holding the extension F or its vicinity by hand, it is easy to pass the legs through the leg openings 6 and 6 and further pull up the diaper 1 from the state. Moreover, since the back side seat member 2B extends below the ventral side seat member 2A at the peripheral edge of the leg opening 6, the ventral side seat member 2A extends below the back side seat member 2B. Or compared with the case where the position of each lower end edge is the same, it is also easy to let a leg pass through the leg opening part 6. FIG.

  In the diaper 1 of the present embodiment, the length La in the X direction of the ventral sheet member 2A is the same as the length Lb in the X direction of the dorsal seat member 2B. Including the case where the length La is larger than the length Lb in the X direction of the back seat member 2B, the dimensions described above can be set as follows so that the above-described effects can be achieved more reliably. From the viewpoint of making it.

  The length Le (see FIG. 3) of the upper extending portion E of the ventral sheet member 2A in the X direction is preferably 5 to 30 mm, and particularly preferably 10 to 30 mm, and the length Le is the ventral sheet member 2A. It is preferable that it is 3 to 20%, particularly 7 to 15% of the length La in the X direction (see FIG. 2). Further, the length La (see FIG. 2) in the X direction of the ventral sheet member 2A is preferably 50 to 200 mm, particularly preferably 100 to 150 mm.

  Moreover, it is preferable that the length Lf (refer FIG. 3) of the X direction of the downward extension part F of the back side seat member 2B is 5-30 mm, especially 10-30 mm, and this length Lf is a back side seat. It is preferable that it is 3 to 20%, particularly 7 to 15% of the length Lb (see FIG. 2) in the X direction of the member 2B. Moreover, it is preferable that the length Lb (refer FIG. 2) of the X direction of the back | dorsal sheet | seat member 2B is 50-190 mm, especially 100-140 mm.

Further, the ratio (Lf / Le) of the length Lf in the X direction of the lower extension F of the back seat member 2B to the length Le in the X direction of the upper extension E of the ventral seat member 2A is 0. .2 to 1.0, particularly 0.3 to 1.0 is preferable.
Further, the length La in the X direction of the ventral sheet member 2A is preferably 100 to 160% of the length of the length Lb in the X direction of the back sheet member 2B, more preferably 100 to 100%. It is 120% long. It should be noted that the expression that the lengths La and Lb in the X direction of the abdominal sheet member 2A and the back sheet member 2B are the same is unavoidable from the accuracy during manufacturing, even if both are intended to have the same length. This includes cases where there is a difference that might occur. However, the absolute value of the difference (La−Lb) is preferably 8% or less, particularly 3% or less of the length La, and the absolute value is more preferably 4 mm or less, particularly 3 mm or less. .

In the diaper 1 of the present embodiment, the number of stacked sheets in the upper extending portion E of the ventral sheet member 2A is larger than the number of stacked sheets in the vicinity of the upper end edge Bu of the back sheet member 2B. .
More specifically, as shown in FIG. 2, the outer layer sheet 22 and the inner layer sheet 23 constituting the ventral sheet member 2A are both folded at the upper end edge Au of the ventral sheet member 2A, respectively. The folded portions 22a and 23a reach the ventral waistline forming portion 20a. Therefore, the upper extending portion E of the abdominal sheet member 2A has a four-layer structure of an outer layer sheet 22, an inner layer sheet 23, a folded portion 22a of the outer layer sheet, and a folded portion 23a of the inner layer sheet. On the other hand, in the back sheet member 2B, the outer layer sheet 22 is folded at the upper end edge Bu of the back side sheet member 2B, while the inner layer sheet 23 is in the vicinity of the upper end edge Bu of the back side sheet member 2B. And is not folded at the upper edge Bu. Therefore, the vicinity of the upper end edge Bu of the back sheet member 2B has a three-layer structure of the outer layer sheet 22, the inner layer sheet 23, and the folded portion 22a of the outer layer sheet.
As described above, the number of sheets stacked in the upper extending portion E of the ventral sheet member 2A is larger than the number of sheets stacked in the vicinity of the upper end edge Bu of the backside sheet member 2B, so that The ease of gripping is improved, the diaper can be more smoothly mounted, and the front / rear discrimination becomes easier.

  The difference in the number of stacked sheets can be two sheets or three or more sheets instead of one sheet. For example, the outer layer sheet 22 and the inner layer sheet 23 are folded at the upper end edge Au of the ventral sheet member 2A, while neither the outer layer sheet 22 nor the inner layer sheet 23 is folded at the upper end edge Bu of the back side sheet member 2B. If so, the difference in the number of stacked sheets is two. Further, another sheet may be laminated between the outer layer sheet 22 and the inner layer sheet 23 or on the skin contact surface side of the inner layer sheet 23 to provide a difference in the number of laminated sheets.

In the diaper 1 of the present embodiment, as described above, the abdominal sheet member 2A and the back sheet member 2B do not have the side seal portions 4 and 4 on both the left and right sides. 21a and a back extension part 21b. Thus, the ventral seat member 2A and the dorsal seat member 2B
If there are portions 21a and 21b that extend without being joined to each other below the cylindrical waistline portion D, it is easy to tear the side seal portion 4 after using the diaper.

  Further, the belly side sheet member 2A and the back side sheet member 2B in the pant-type absorbent article of the present invention have different contraction stresses in the portions Da and Db that form the peripheral edge of the upper opening of the cylindrical waistline portion D. It is preferable. The portions Da and Db that form the peripheral edge portion of the upper opening of the cylindrical waistline portion D are, as shown in FIGS. 3 and 4, a predetermined width with the position of the upper end edge Bu of the back seat member 2B as the upper end. In order to compare the contraction stress of the portion Da of the ventral sheet member 2A and the contraction stress of the portion Db of the dorsal sheet member 2B, each of the ventral sheet member 2A and the dorsal sheet member 2B From this, a strip-like sample covering the entire length between the side seals 4 and 4 is cut out, and the respective contraction stresses are measured and compared. The width of the sample to be cut out is preferably 30 mm.

  If the contraction stress of the ventral sheet member 2A and the dorsal sheet member 2B is different, a space is created between the dorsal part and the ventral part, and the upper part of the ventral part can be easily grasped by hand. be able to.

  Further, the contraction stress of the ventral sheet member 2A and the dorsal sheet member 2B is such that the contraction stress of the dorsal sheet member 2B is larger than the contraction stress of the ventral sheet member 2A, and the upper extension E is wide. It is preferable from the viewpoint of easily maintaining the state and improving the ease of grasping the upper part of the abdominal side, the visibility of the upward extension E, and the like.

The contraction stress of the portions Da and Db of the ventral sheet member 2A and the back sheet member 2B is measured, for example, as follows.
A sample (a sample having a length over the entire length between the side seals 4 and 4) is fixed between a pair of chucks of a tensile tester (for example, “RTA-100” manufactured by Orientec). The sample is fixed by sandwiching a portion having a width of 10 mm from the edge at each end portion in the longitudinal direction of the sample with a chuck. The sample is fixed in a natural state (a state in which the sample is contracted naturally without applying an external force). The sample was stretched in the same direction as the diaper width direction (Y direction) at a tensile speed of 300 mm / min, and the length of the sample (distance between chucks) reached 70% of the maximum elongation. The load is the shrinkage stress.
The maximum extension refers to the length of the sample in a state where the sample is not contracted. The reason why 70% is used as an index is to reproduce the stretched state of the sample when the pants-type disposable diaper is worn.

  The difference between the contraction stress of the part Da of the ventral sheet member 2A and the contraction stress of the part Db of the back sheet member 2B measured by the above method is 0.5 to 2.0 N / 30 mm, particularly 1.0. It is preferable that it is -2.0N / 30mm. Further, the contraction stress of the portion Da of the ventral sheet member 2A is preferably 1.0 to 3.0 N / 30 mm, particularly 1.5 to 2.5 N / 30 mm.

Moreover, it is preferable that the cylindrical waist part D has the area | region Dt in which shrinkage stress is larger than shrinkage stress in the peripheral part Du of an upper opening part in the downward direction in this waist part D.
By increasing the contraction stress of the region Dt below which it is easier to hit the wearer's iliac region than the cylindrical waistline portion D, it is possible to effectively prevent the diaper from slipping downward, The peripheral edge portion Du of the upper opening of the torso portion D can be prevented from hitting the skin of the wearer and causing a rubber mark or a burden on the skin.
Here, the contraction stress of the peripheral edge portion Du of the upper opening and the contraction stress of the region Dt form a portion constituting the abdominal seat member 2A side and the back seat member 2B side from the cylindrical waistline portion D. An annular sample in which the portion is connected in an annular shape is cut out, and the shrinkage stress is measured for each of the samples by the following method. The width of the sample to be cut out is preferably 30 mm.

As shown in FIG. 5, an annular sample S is bridged between a pair of U-shaped jigs 100, 100 so that a tensile tester (for example, “RTA-100” manufactured by Orientec Co., Ltd.) Fix between the chucks 110 and 110. The length a of the sample S in the initial state (see FIG. 5) is ½ of the circumference of the sample S in the state in which the annular sample S is naturally contracted (natural state, no external force is applied). Say it. Then, the sample S fixed between the chucks 110 and 110 is stretched at a tensile speed of 300 mm / min until the length of the sample S (length between jigs) is 70% of the maximum elongation.
The maximum extension refers to the length of the sample in a state where the sample is not contracted. The reason why 70% is used as an index is to reproduce the stretched state of the sample when the pants-type disposable diaper is worn.

Note that the iliac region is a part from the wearer's iliac crest to the upper anterior iliac spine. For example, for a part from the iliac crest to the upper anterior iliac spine, JP-A-2006-61680 Explained.
In order for the region Dt below the peripheral edge Du of the upper opening to abut on the site from the wearer's iliac crest to the upper anterior iliac spine in the state where the diaper 1 is worn, the annular region Dt is When the diaper is included in an unfolded and extended state, the center position of the annular region Dt (the center position in the longitudinal direction of the diaper 1), the upper end of the ventral waistline forming part 20a, and the dorsal waistline forming part 20b It is preferable that the distances k1 and k2 (see FIG. 2) between the diaper crotch bottom line CL that bisects the upper end of the diaper are 180 to 230 mm, respectively, more preferably It is 185-220 mm, More preferably, it is 195-215 mm. In the case of adult diapers, the distances k1 and k2 (see FIG. 2) are preferably 300 to 350 mm, particularly 305 to 335 mm. In the present embodiment, the region Dt is in contact with a site from the wearer's iliac crest to the superior anterior iliac spine. The crotch bottom line CL bisects the distance L7 between the upper end of the abdomen waistline forming part 20a and the upper end of the back waistline part forming part 20b.

Moreover, when the said area | region Dt is divided | segmented into the abdominal sheet member 2A side and the back | dorsal sheet member 2B side, it is preferable that the contraction stress by the back | dorsal sheet member side is larger than the abdominal sheet member side.
By having such a configuration, there is a space between the abdomen seat member and the dorsal seat member, and the abdomen seat member is easy to maintain a wide state, so that it is easy to pass the foot when worn. .

The portion of the ventral sheet member 2A and the dorsal sheet member 2B described above is used for the measurement of the shrinkage stress except that a sample obtained by dividing the region Dt into the ventral sheet member 2A side and the dorsal sheet member 2B side is used. It can be measured in the same manner as the shrinkage stress of Da and Db.
Further, the difference between the contraction stress of the sample on the ventral sheet member 2A side and the contraction stress of the sample on the back sheet member 2B side measured by the method is 0.5 to 2.0 N / 30 mm, particularly 1.0. It is preferable that it is -2.0N / 30mm. Further, the contraction stress of the sample of the ventral sheet member 2A is 2.0 to 5.0 N / 30 mm, particularly preferably 3.0 to 5.0 N / 30 mm, and the contraction stress on the back side sheet member 2B side is It is preferably 3.0 to 6.0 N / 30 mm, particularly preferably 5.0 to 6.0 N / 30 mm.

  In addition, it is preferable that length L5 (refer FIG. 2) of the abdominal side extension part 21a is 3 to 30% of the length La (refer FIG. 2) of the abdominal sheet member 2A, especially 5 to 20%, The length L6 (see FIG. 2) of the back extension 21b is preferably 3 to 40%, particularly 7 to 30%, of the length Lb (see FIG. 2) of the back seat member 2B. In the case of an infant diaper, the length L5 of the abdominal extension 21a is preferably 5 to 30 mm, particularly 10 to 30 mm, and the length L6 of the back extension 21b is 10 to 60 mm. In particular, it is preferably 20 to 60 mm. In the case of an adult diaper, the length L5 of the abdominal extension part 21a is preferably 10 to 50 mm, particularly preferably 20 to 40 mm, and the length L6 of the back extension part 21b is 15 to 80 mm. In particular, the thickness is preferably 30 to 70 mm.

  The method for differentiating the contraction stress of each part is not particularly limited as long as the contraction stress can be varied. For example, (1) the sheet 22 and / or 23 in the region where the contraction stress is high and the region where the contraction stress is low. (2) A method of changing the thickness of the elastic member to be distributed between a region having a high shrinkage stress and a region having a low shrinkage stress, and (3) a high shrinkage stress. (4) A method of changing the arrangement pitch of the elastic member between a region having a high shrinkage stress and a region having a low shrinkage stress, and 5) The method etc. which combined these 2 or more are mentioned.

In addition, the pant-type absorbent article of the present invention has high-rigidity portions 4 ′ and 4 ′ formed by melting and solidifying the sheet material constituting the portion in the upper extending portion E of the ventral sheet member 2A. It is preferable that a plurality of the absorbent articles are formed apart from each other in the width direction Y from the viewpoint of giving rigidity to the upper extending portion E and facilitating gripping of the peripheral edge portion of the waist opening with both hands.
For example, as shown in FIG. 3, the heat sealing process for forming the side seal portion 4 is performed not only in the portion where the ventral sheet member 2A and the dorsal sheet member 2B overlap but also in the ventral sheet member 2A. By applying also to the part extended from the back seat member 2 </ b> B, the above-described high-rigidity part 4 ′ can be formed on the extension line of the side seal part 4.

  As the outer layer sheet 22 and the inner layer sheet 23, various sheet materials conventionally used for this type of article can be used without particular limitation, but is preferably a non-woven fabric, particularly from the viewpoint of flexibility and the like. It is preferably a single-layer nonwoven fabric or a laminated nonwoven fabric of two or more layers composed of a through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, or the like. Moreover, the sheet | seat which integrated these nonwoven fabrics and films may be sufficient. As a forming material of the elastic member 24, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As the form of the elastic member, it is preferable to use a thread-like (thread rubber etc.) or string-like (flat rubber etc.) cross-section having a rectangular, square, round, polygonal cross section, or a multifilament type thread-like one. it can.

  The above-described diaper 1 is intermittent, for example, so as to bridge the absorbent main body 3 between the belt-shaped original fabric of the abdomen-side sheet member 2A and the belt-shaped original fabric of the back-side sheet member 2B while separating them. Then, after folding in half so that the belt-like original fabric of the abdominal sheet member 2A and the belt-like original fabric of the back-side sheet member 2B overlap each other, heat sealing or the like for forming the side seal portion 4 (joint ), And at the same time as or after the joining, it is cut and divided into individual disposable diapers. According to this method, it is unnecessary to remove the trim from the raw material of the outer packaging material or to reduce the size of the trim to be removed, as compared with the case where the through hole or notch for forming the leg opening is formed. Can be planned. In particular, the strips of the abdominal sheet member 2A and the back sheet member 2B cut by a straight line perpendicular to the flow direction are the abdomen sheet member 2A and the back sheet member 2B of the completed diaper 1. This is preferable because trim removal is unnecessary.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, the ventral sheet member may have a length in the X direction that is longer than the length in the same direction of the back sheet member. Further, the ventral sheet member 2A may not have the ventral extension portion 21a. Moreover, the back side extension part 21b of the back | dorsal sheet | seat member 2B is expansion-contraction of the diaper width direction to the downward extension part F extended below the part which overlaps with the abdominal side extension part 21a, or the abdominal side extension part 21a. It may be one having no properties.

  Further, the side seal portion 4 is formed by joining the side edges 2a and 2b of the ventral side and the back side seat member, but the ventral side seat member 2A and the back side seat member 2B are formed outside the side seal portion 4. And may have a non-joined portion with a narrow width (for example, more than 0 mm and not more than 20 mm).

The pants-type absorbent article may be a pants-type sanitary napkin or the like in addition to a pants-type disposable diaper for infants or adults.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

1 Pants-type disposable diapers (pants-type absorbent articles)
D waist part 2A abdominal sheet member 20a abdomen waist part forming part 21a abdominal extension part E upper extension part 2B back sheet member 20b dorsal part part forming part 21b dorsal extension part F downward extension part 22 Outer layer sheet 23 Inner layer sheet 24 Elastic member 3 Absorbent body 31 Top sheet 32 Back sheet 33 Absorber 4 Side seal part 4 'High-rigidity part 5 Waist opening part 6, 6 Leg opening part G1 Upper extension part Expansion part G2 Girth circumference Extendable part G3 Downward extension part Extendable part

Claims (7)

An abdominal sheet member disposed on the wearer's ventral side, a dorsal sheet member disposed on the wearer's dorsal side, and an absorptive main body secured over the abdominal sheet member and the dorsal sheet member; A pants-type absorbent article in which both sides of the abdominal sheet member and both sides of the back sheet member are joined to form a cylindrical waistline,
The ventral sheet member and the dorsal sheet member are rectangular in the deployed and expanded state of the absorbent article,
The ventral sheet member has a length in the longitudinal direction of the absorbent article equal to or greater than the length in the same direction of the dorsal sheet member,
The ventral sheet member and the dorsal sheet member are such that the ventral sheet member extends above the upper end edge of the dorsal sheet member and the dorsal sheet member extends below the lower end edge of the ventral sheet member. Pants-type absorbent article joined to   2. The pant-type absorbent article according to claim 1, wherein the length of the abdomen-side sheet member in the longitudinal direction of the absorbent article is the same as the length of the back-side sheet member in the same direction.   The pants-type absorbent article according to claim 1 or 2, wherein the belly side sheet member and the back side sheet member have different contraction stresses in a portion forming a peripheral edge portion of the upper opening portion of the cylindrical waistline portion.   The pants-type absorbent article according to claim 3, wherein the back side sheet member has a larger shrinkage stress in the portion forming the peripheral edge of the upper opening of the cylindrical waistline portion than the abdominal side sheet member.   The cylindrical waistline portion has a region where the shrinkage stress is larger than the shrinkage stress of the peripheral edge portion of the upper opening portion below the peripheral edge portion of the upper opening portion in the waistline portion. The pants-type absorbent article according to any one of claims 1 to 4, wherein when divided into the side sheet member side and the back side sheet member side, the contraction stress on the back side sheet member side is larger than that of the abdominal side sheet member. .   The number of sheets stacked in a portion extending upward from the upper end edge of the back side sheet member of the ventral side sheet member is greater than the number of sheets stacked in the vicinity of the upper end edge of the back side sheet member. The underpants-type absorbent article according to item 1.   The abdominal side seat member and the back side seat member have a portion that extends without being joined to each other below the cylindrical waistline portion. Pants-type absorbent article.

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