JP5580675B2 - 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 absorbent main body is fixed so as to be bridged over the abdominal sheet member and the back sheet member, and the left and right side edges of the abdominal sheet member are joined to the left and right side edges of the back side sheet member. There are known pant-type absorbent articles. 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 back side exterior sheet, and the back side exterior sheet extends to the back side body part and the lower side thereof. And extending the second elastic elastic member provided on the buttock cover part on both sides of the back side extension part to the middle part and the lower end part of the back side body part. A pants-type disposable diaper that is higher than the stretch rate of the first elastic elastic member provided is described.

Special table 2008-508082 JP 2008-178682 A

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 need or need to be removed from the outer packaging material It can be made of miniaturization.
However, the pull-on garments and the pants-type disposable diapers described in Patent Documents 1 and 2 require trim removal at the time of manufacture because the lower end of the back sheet member is processed into a curved shape.
On the other hand, when both the ventral seat member and the back seat have a rectangular shape or a shape close thereto, the morphological difference between the ventral seat member and the back seat member is reduced, and the front and rear of the diaper are reduced. It becomes difficult to distinguish visually.

  Therefore, the present invention is similar to the abdominal sheet member and the dorsal sheet member while the outer packaging material is divided into the abdominal sheet member and the dorsal sheet member and is a pant-type absorbent article that can be efficiently manufactured. Even if it is such a shape, it is related with the underpants type absorbent article which can distinguish easily before and after a diaper.

  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. An absorptive main body, and the ventral sheet member and the dorsal sheet member are joined to each side edge portion between the ventral sheet member and the dorsal sheet member; A pant-type absorbent article, which is located on the lower extension line of the sheet and is formed with a non-joined portion in which the ventral sheet member and the dorsal sheet member are not joined to each other, the ventral sheet member and the dorsal side The sheet member has a main body portion positioned between the joint portions and an extending portion extending below the main body portion, and an elastic member is disposed in each of the main body portion and the extending portion in the lateral direction. Along the body part of the ventral seat member, The elastic members arranged in the main body part of the G member and the extending part of the back side sheet member are arranged at an equal elongation rate, and the elastic members arranged in the extending part of the abdominal side sheet member are The present invention provides a pant-type absorbent article that is disposed at a higher elongation rate than the elastic member that is disposed in the extending portion of the back side sheet member.

  The pants-type absorbent article of the present invention is a pants-type absorbent article in which the outer packaging material is divided into a ventral sheet member and a dorsal sheet member, and can be efficiently manufactured. Even if the member has a similar shape, the front and back of the diaper can be easily distinguished.

FIG. 1 is a view showing a use state (wearing state) of a pants-type disposable diaper according to an embodiment of the present invention, where (a) is a view seen from the abdominal side, and (b) is a side view. The figure seen from (c) is the figure seen from the back side part side. 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 partially broken enlarged view of the stretched state in which the abdomen side of the pant-type disposable diaper shown in FIG. 1 is viewed from the outer surface side of the diaper. FIG. 4 is a partially broken enlarged view of the stretched state of the back side portion of the pants-type disposable diaper shown in FIG. 1 as viewed from the outer surface side of the diaper. FIG. 5 is a schematic diagram showing an appearance of the pants-type disposable diaper shown in FIG. 1 in a contracted state (natural state). FIG. 6 is a schematic plan view showing a joining mode of the absorbent main body and the extended portions of the ventral sheet member and the back sheet portion. FIG. 7 is a view showing a cross section along the diaper lateral direction of each stretchable part in the pants-type disposable diaper shown in FIG. 1, (a) is a state in which the elastic member is extended to eliminate wrinkles, and (b) is It is a figure which shows the state in which the elastic member contracts and the wrinkle is formed.

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. Comprising a back sheet member 2B disposed on the back side of the person, an abdominal sheet member 2A, and an absorbent main body 3 secured over the back sheet member 2B, and both side edges of the abdominal sheet member 2A A pair of side seal portions 4, 4 formed by joining the upper portions of the portions 2a, 2a and the upper portions of the side edges 2b, 2b of the back seat member 2B are formed.

  As shown in FIG. 2, the side seal portion 4 is formed shorter than either the length La of the abdominal seat member 2A or the length Lb of the back seat member 2B. The sheet member 2 </ b> B is formed with an extension portion 21 a and an extension portion 21 b that extend downward from the side seal portion 4 (downward when worn).

  Describing in more detail, the diaper 1 is, as shown in FIGS. 1 and 2, when worn, a ventral side A disposed on the abdomen side of the wearer and a dorsal side part disposed on the back side of the wearer. B and a crotch part C located between the ventral part A and the dorsal part B and arranged in the crotch part of the wearer. The longitudinal direction of the diaper (absorbent article) 1 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 diaper (absorbent article) 1 The horizontal direction is a direction along the wearer's waistline direction, and is a direction (Y direction in FIG. 2) that intersects the vertical direction of the diaper (absorbent article) 1.

  As shown in FIG. 2, the absorbent main body 3 of the diaper 1 has a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32, and a liquid holding member disposed between both sheets 31 and 32. It 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 has the low-rigidity portions 33d on either side in the longitudinal direction where the absorbent core forming material does not exist or the basis weight of the forming material is smaller than that of the 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. On the outer side of the absorbent main body 3, an exterior sheet such as a non-woven fabric or a film can be disposed on the back sheet 32.

  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 side edges 2a, 2a along the diaper longitudinal direction (X direction); It has a pair of upper and lower end edges 2c, 2d (upper end edge 2c, lower end edge 2d) along the diaper lateral direction (Y direction). Similarly, the back side seat member 2B has a horizontally long rectangular shape, a pair of left and right side edges 2b and 2b along the diaper longitudinal direction (X direction), and a pair of upper and lower sides along the diaper lateral direction (Y direction). End edges 2c and 2d. As shown in FIG. 2, the ventral sheet member 2 </ b> A and the back sheet member 2 </ b> B have a uniform diaper length (X direction) in the diaper lateral direction (Y direction).

  The ventral sheet member 2A is joined to the side edge portions 2a and 2a by joining between the ventral sheet member 2A and the dorsal seat member 2B to form the side seal portion 4. And a non-joined portion 2a ″ that extends below the joined portion 2a ′ and is not joined between the abdominal sheet member 2A and the back seat member 2B. 2B is similarly joined to each of the side edge portions 2b and 2b, a joining portion 2b 'in which a portion between the back seat member 2B and the ventral seat member 2A is joined to form a side seal portion 4, and the joining portion. It extends below 2b 'and has a non-joined portion 2b "in which the back side seat member 2B and the abdominal side seat member 2A are not joined. And by joining joined part 2a 'which is a part of side edge 2a of stomach side sheet member 2A, and joined part 2b' which is a part of side edge 2b of back side sheet member 2B The diaper 1 is formed with the pair of side seal portions 4 and 4 described above. For this joining, for example, a heat seal, a high frequency seal, an ultrasonic seal, an adhesive, or the like is used. Moreover, the waist opening part 5 and a pair of leg opening parts 6 and 6 are formed with the side seal parts 4 and 4 by this joining.

  The ventral sheet member 2A thus has a main body 20a (hereinafter referred to as the abdominal main body 20a) located between the joints 2a ′ and 2a ′ and below the main body 20a (the crotch C side). It has a rectangular extension portion 21a (hereinafter also referred to as a ventral extension portion 21a) that extends. Similarly, the back seat member 2B extends to the main body 20b (hereinafter referred to as the back main body 20b) located between the joints 2b 'and 2b' and below the main body 20a (the crotch C side). It has a rectangular extension portion 21b (hereinafter also referred to as a back side extension portion 21b).

  The joint portion 2a ′ and the non-joint portion 2a ″ of the side edge portion 2a of the ventral sheet member 2A continuously extend in the longitudinal direction of the diaper when the diaper is expanded and extended (see FIG. 2). The joint portion 2b ′ and the non-joint portion 2b ″ of the side edge portion 2b of the back seat member 2B also extend continuously in the longitudinal direction of the diaper when the diaper is expanded and extended (see FIG. 2). FIG. 1 shows a state where the infant's trunk 7 a is inserted into the waist opening 5 and the infant's legs 7 b and 7 b are inserted into the leg openings 6 and 6.

  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 part of the Y direction of the ventral sheet member 2A via an adhesive, and the other end of the longitudinal direction The side (portion overlapping with the back sheet member 2B) is fixed to the central portion in the Y direction of the back sheet member 2B via an adhesive.

  As shown in FIGS. 3 and 4, the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B in the diaper 1 are both an outer layer sheet 22 that forms the outer surface of the diaper, and an inner layer sheet that is disposed on the inner surface side of the outer layer sheet 22. 23 and a plurality of thread-like elastic members 24 disposed between the two sheets 22 and 23, and a waist stretchable part G1 and a waistline stretchable part on the abdominal body part 20a and the back body part 20b, respectively. G2 is formed, and the extension part expansion and contraction part G3 is formed in the ventral extension part 21a and the back extension part 21b.

  The waist stretchable part G1 is formed outward from the longitudinal ends 3a, 3b of the absorbent main body 3 in the longitudinal direction (X direction) of the diaper 1 in each of the abdominal sheet member 2A and the back sheet member 2B. Has been. The waist elastic part G2 includes a waist elastic part G1 and an abdominal extension part 21a or a back extension part 21b in the longitudinal direction (X direction) of the diaper 1 in each of the abdominal sheet member 2A and the back sheet member 2B. Is formed between. The extension part stretchable part G3 is formed in the ventral side extension part 21a or the back side extension part 21b. The waist extension / contraction part G2 and the extension part extension / contraction part G3 are respectively formed in portions located outward from at least both side edges in the longitudinal direction of the absorbent main body 3 in the lateral direction (Y direction) of the diaper 1. Preferably it is.

  In the diaper 1 shown in FIG.3 and FIG.4, the waist expansion-contraction part G1 expresses a stretching property over the whole region between the edge fixing | fixed part 27,27 in 2A of abdominal sheet members or the back sheet member 2B. On the other hand, the waist part stretchable part G2 and the extension part stretchable part G3 express stretchability on the outer side of both side edges of the absorbent main body 3, and overlap with the absorbent main body 3, particularly the absorbent main body. The diaper 1 is formed in a state of being divided into right and left so as not to exhibit stretchability in a portion overlapping the central portion in the width direction 3.

Abdominal body part 20a which is the body part of the abdominal sheet member 2A, a back body part 20b which is the body part of the back sheet member 2B, a ventral extension part 21a which is an extension part of the abdominal sheet member 2A, And the back side extension part 21b which is an extension part of the back side seat member 2B is spaced apart in the vertical direction of the diaper so that the plurality of elastic members 24 respectively extend along the diaper lateral direction. Opened and arranged in an extended state.
More specifically, as for the abdominal sheet member 2A, as shown in FIG. 3, a plurality of elastic members 24A are arranged on the waist elastic part G1 in the abdominal body part 20a, and the waistline expansion and contraction in the abdominal body part 20a. A plurality of elastic members 24B are arranged in the part G2, and a plurality of elastic members 24C are arranged in the extension part expansion / contraction part G3 in the ventral extension part 21a.
On the other hand, as shown in FIG. 4, with respect to the back seat member 2B, a plurality of elastic members 24D are arranged on the waist stretchable part G1 of the back side main body part 20b, and a plurality of elastic members 24D are arranged on the waistline stretchable part G2 of the back side main body part 20b. A plurality of elastic members 24E are arranged, and a plurality of elastic members 24F are arranged on the extending portion extending and contracting portion G3 in the back side extending portion 21b.

  And elastic members 24A and 24B arranged in the ventral body part 20a of the ventral sheet member 2A, elastic members 24D and 24E arranged in the dorsal body part 20 of the dorsal sheet member 2B, and a dorsal extension The elastic member 24F disposed in the portion 21b is disposed at an equal elongation rate.

  On the other hand, the elastic member 24C of the ventral extension portion 21a is arranged at a higher elongation rate than the elastic member 24F of the back extension portion 21b. By arranging the elastic member 24C on the ventral extension portion 21a at a higher elongation rate than the elastic member 24F of the back extension portion 21b, as shown in FIG. 5, the ventral extension portion 21a extends to the back side. Even if the shape of the abdominal sheet member 2A and the back sheet member 2B of the diaper 1 in the expanded and expanded state is similar to that of the protruding portion 21b in the lateral direction of the diaper, The front and rear of the diaper 1 can be easily discriminated visually.

  From such a point of view, the difference between the extension rate of the elastic member 24C of the ventral extension portion 21a and the extension rate of the elastic member 24F of the back extension portion 21b is 25 with respect to the extension rate of the elastic member 24F. It is preferable that it is -80%, and it is more preferable that it is 40-60%.

The elongation rate of the elastic member arranged in each stretchable part can be measured by the following method.
<Measurement method of elongation rate>
(1) About the diaper 1 of an unstretched state, a mark of length 20mm is attached to each expansion-contraction part along the width direction.
(2) At both ends of this mark, the sheet member and the elastic member are gripped, and each expansion / contraction part is extended in the width direction until a state in which the sheet member of each expansion / contraction part is eliminated (extended state).
(3) The length (distance between both ends) Lp of the mark after extension is measured.
(4) Let (Lp / 20) × 100 (%) be the elongation rate of the elastic member disposed in each stretchable part.
(5) For the unstretched diaper 1, when it is impossible to mark each stretchable part with a length of 20 mm along the width direction, the measurement is performed with marks as large as possible.

In the waist stretchable part G1, the waistline stretchable part G2, and the extended part stretchable part G3 in the diaper 1 of the present embodiment, a large number of joints 26 formed between the outer layer sheet 22 and the inner layer sheet 23 in a dotted shape. Are joined.
More specifically, the joint portions 26 are intermittently arranged in series in the lateral direction (Y direction) of the diaper 1 in any of the stretchable portions G1 to G3 of the ventral seat member 2A and the back seat member 2B. A plurality of joint rows are formed in the longitudinal direction (X direction) of the diaper 1. Further, the positions in the Y direction of the respective joints in the joint rows are also consistent in all the joint rows. In addition, a longitudinal junction row is formed in which the junctions 26 are arranged in series in the longitudinal direction (X direction) of the diaper 1, and the longitudinal junction row is spaced apart in the lateral direction (Y direction) of the diaper 1. A plurality of rows are formed.
And in any of the expansion-contraction parts G1-G3 of 2A of ventral | abdominal sheet members and the back | dorsal sheet | seat member 2B, the some elastic member 24 is distribute | arranged so that it may each pass between the junction parts 26 adjacent to the vertical direction. Yes. In addition, each elastic member 24 is fixed between the sheets 22 and 23 at an end fixing portion 27 or an absorbent main body fixing portion 28 described later. Also not fixed.

  The waist stretchable part G1 of the abdominal sheet member 2A is a pair of end fixings in which the outer layer sheet 22 and the inner layer sheet 23 are bonded to both side edges 2a, 2a of the abdominal sheet member 2A via an adhesive. It has a portion 27 (see FIG. 3). The elastic member 24 </ b> A disposed in the waist stretchable part G <b> 1 is fixed between the sheets 22 and 23 in each of the pair of end fixing parts 27, and between the end fixing parts 27, whichever of the sheets 22 and 23 is provided. Also not fixed. The same applies to the waist stretchable part G1 of the back seat member 2B (see FIG. 4).

  The waistline stretchable part G2 of the abdominal sheet member 2A is fixed to the side edge part of the abdominal sheet member 2A at the end part where the outer layer sheet 22 and the inner layer sheet 23 are joined via an adhesive. The absorbent main body side fixing portion 28 has an outer portion sheet 22 and an inner layer sheet 23 bonded to each other on the center side in the diaper lateral direction from the end portion fixing portion 27. (See FIG. 3). The elastic member 24B disposed in the waist elastic part G2 is fixed between the sheets 22 and 23 in the end fixing part 27 and the absorbent main body side fixing part 28, respectively, while the end fixing part 27 and the absorbent main body are fixed. Between the side fixing portion 28, it is not fixed to any of the sheets 22 and 23. The same applies to the extension part stretchable part G3 of the abdominal sheet member 2A, the waistline stretchable part G2 and the extension part stretchable part G3 of the back side sheet member 2B (see FIGS. 3 and 4).

  As shown in FIGS. 3 and 4, the absorbent main body side fixing portion 28 has an end on the laterally outer side of the diaper positioned on the inner side (center side) in the lateral direction of the diaper from the position of the side edge 3 c of the absorbent main body 3. However, instead of this, it may be formed so as to extend inside or outside the side edge 3c of the absorbent main body 3, or it may be formed outward from the side edge 3c of the absorbent main body 3 in the diaper lateral direction. You can also.

Moreover, the absorptive main body 3 in the diaper 1 of this embodiment is joined in the range shown by 8A in FIG. 6 with respect to the abdominal extension part 21a, and 8B in FIG. 6 with respect to the back extension part 21b. Are joined in the range indicated by. And as for the absorptive main body 3, the width | variety Wa currently fixed to the ventral | extension side extension part 21a is smaller than the width | variety Wb currently fixed to the back | dorsal side extension part 21b.
By setting the width Wa> the width Wb, it becomes easier to make a difference between the extent to which the ventral extension portion 21a contracts and the extent to which the dorsal extension portion 21b contracts.

  The length L5 (length in the diaper longitudinal direction, see FIG. 2) of the ventral side extension 21a is 5 to 60% of the length La (see FIG. 2) in the same direction of the ventral sheet member 2A, in particular. The length L6 (the length in the diaper longitudinal direction, see FIG. 2) of the back side extending portion 21b is preferably 20 to 40%, and the length Lb in the same direction of the back side seat member 2B (see FIG. 2). 5) to 60%, particularly 20 to 40%. Moreover, in the case of the diaper for infants, it is preferable that extension length L5, L6 of each of the abdominal side and the back side extension parts 21a and 21b is 10-100 mm, More preferably, it is 20-70 mm. In the case of an adult diaper, the extended lengths L5 and L6 of the abdominal and dorsal extending portions 21a and 21b are preferably 10 to 150 mm, more preferably 20 to 100.

Further, the extension length L6 of the dorsal extension portion 21b is the same as the extension length L5 of the ventral extension portion 21a (L5 = L6) or more (L6> L5). This is preferable from the viewpoint that it can be visually determined. By making the back side extension part 21b longer than the abdominal side extension part 21a, the front and back of the diaper 1 can be easily distinguished visually, and the appearance resembles clothing. In addition, the appearance on the abdominal side of the REC opening is a thin and refreshing appearance.
Moreover, the slippage fall of the diaper 1 in a mounting state can be suppressed by providing the ventral | extension side extension part 21a. Moreover, by providing the back side extension part 21b, the wearer's buttocks in the wearing state can be covered, and if it is for infants, a sense of security can be given to the parent.
Moreover, when both the abdominal extension part 21a and the back extension part 21b are provided, the side seal part 4 of the diaper 1 in the mounted state can be made substantially straight.
The ratio (L5 / L6) of the extension length L5 of the ventral extension 21a to the extension length L6 of the dorsal extension 21b is preferably 0.2 to 0.8, 0.4 More preferably, it is -0.6.

  In the waist stretchable part G1, the waistline stretchable part G2, and the extended part stretchable part G3 of each of the abdominal sheet member 2A and the back sheet member 2B, the elastic member 24 contracts, so that the sheets between the adjacent longitudinal joint rows 22 and 23 are deformed so as to bulge outward, and a ridge 29 made of the sheet 22 or the sheet 23 is formed between adjacent longitudinal joint rows, and between the two sheets 22 and 23, the ridge 29 and the ridge 29 The hollow part 30 surrounded by the periphery is formed (see FIG. 7). By forming the heel 29 and the hollow portion 30, the softness of the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B is improved to improve the touch and the like, and between the heel 29 formed on the skin contact surface side Air is easy to circulate and has excellent anti-sag properties. In particular, when the inner layer sheet 23 is formed of a breathable sheet such as a nonwoven fabric, moisture in the diaper 1 is more easily released to the outside.

  In the diaper 1 of the above-described embodiment, the outer layer sheet 22 and the inner layer sheet 23 have extended folded portions 22a and 23a that are folded back to the inner layer sheet 23 side at the edge portion 2c that forms the opening peripheral edge of the waist opening. The extended folded portions 22a and 23a are joined to the unfolded portions of the outer layer sheet 22 and the inner layer sheet 23 in the side seal portion 4 and overlap with the longitudinal direction of the absorbent main body 3 Is bonded to the surface of the absorbent main body 3 on the surface sheet 31 side by an adhesive.

  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, in the diaper 1 of the above-described embodiment, the elastic member 24A, the elastic member 24B, the elastic member 24D, and the elastic member 24E are all arranged at an elongation rate equal to that of the elastic member 24F. The elastic member 24A and the elastic member 24B may have different elongation rates, provided that the elongation rate of the member 24E is equal to that of the elastic member 24F and the elastic member 24C is arranged at a higher elongation rate than the elastic member 24F. Moreover, the expansion ratios of the elastic member 24D and the elastic member 24E may be different. For example, the elastic member 24A may have a lower elongation rate than the elastic member 24B, and the elastic member 24D may have a lower elongation rate than the elastic member 24E.
Further, the abdominal sheet member 2A and the back sheet member 2B are replaced with one having a dot-shaped joint portion 26 formed so as not to overlap the elastic member 24, and the outer layer sheet 22 forming the outer surface of the diaper and its It may have a structure in which the inner layer sheet 23 arranged on the inner side is bonded in the entire region. Further, the waist stretchable part G1, the waistline stretchable part G2, and the extended part stretchable part G3 each have an outer layer sheet 22 that forms the outer surface of the diaper and an inner layer sheet 23 disposed on the inside thereof in the entire region. It may have a bonded structure.

Moreover, as for the absorptive main body 3, the width | variety Wa fixed to the ventral | extension side extension part 21a and the width | variety Wb fixed to the back | dorsal side extension part 21b may be the same.
Further, the waist elastic part G2 may be formed so as to extend over the entire width of the abdominal sheet member 2A and / or the back sheet member 2B, and the extending part elastic part G3 may also be formed in the abdominal sheet member 2A and / or the back. You may form so that the full width of the side sheet | seat member 2B may be covered.

  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)
2A Ventral sheet member 2a, 2a Side edge 2a ', 2a' Joined part 2a ", 2a" Non-joined part 20a Ventral body part 21a Ventral extension part 2B Back side sheet member 2b, 2b Side edge 2b ' , 2b 'Joint part 2b ", 2b" Non-joint part 20a Back side main body part 21b Back side extension part 22 Outer layer sheet 23 Inner layer sheet 24, 24A-24F Elastic member 29 ３ 3 Absorbent main body 31 Top sheet 32 Back sheet 33 Absorbent body 34 Side cuffs 4 Side seal part 5 Waist opening part 6 Leg opening part A Abdominal side part B Back side part C Crotch part G1 Waist elastic part G2 Girth elastic part G3 Extension part elastic part

Claims (4)

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; Comprising
The ventral sheet member and the dorsal seat member are located on the respective side edges of the joint between the ventral sheet member and the dorsal seat member, and on the downward extension of the joint, A pants-type absorbent article in which a non-joined part is not formed between the ventral sheet member and the dorsal sheet member,
The abdomen seat member and the back seat member have a main body portion positioned between the joint portions and an extension portion extending below the main body portion, and the main body portion and the extension portion , Each elastic member is arranged in an extended state along the lateral direction,
The elastic members arranged in the body part of the abdominal sheet member, the body part of the back sheet member, and the extending part of the back sheet member are arranged at an equal elongation rate to each other. The elastic member arranged in the protruding portion is arranged at a higher elongation rate than the elastic member arranged in the extending portion of the back seat member ,
The said absorptive main body is a pants type absorbent article in which the width | variety currently fixed to the extension part of the abdominal sheet member is smaller than the width | variety fixed to the extension part of a back | dorsal sheet member . Extending length of the extending portion of the ventral sheet member is shorter than the extending length of the extending portion of the dorsal sheet member, according to claim 1 Symbol placement of pant-type absorbent article. The underpants type absorbent article according to claim 1 or 2 , wherein both the ventral sheet member and the dorsal sheet member are rectangular. An elastic part is formed by the plurality of elastic members in the main body part and the extension part of each of the abdominal sheet member and the back side sheet member, and two sheets sandwiching the elastic member are scattered in the elastic part. are joined together in a number of joints formed in dots, a plurality of elastic members are arranged so as to pass between joints adjacent to each other in the longitudinal direction of the respective absorbent article, according to claim 1 to 3 The underpants-type absorbent article according to any one of the above.

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