JP2017121386A - Underpants type absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type absorbent article whose exterior body is soft and has good feel, including a peripheral edge part of a waist opening, and which prevents a hand from being put in a rear side of a folded part of a sheet material composing the exterior body when the article is put on.SOLUTION: An underpants type absorbent article 1 is provided with an absorbent body 3 including an absorber and an exterior body 2, and forms a pair of side seal parts 4 and 4, a waist opening, and a pair of leg openings. Exterior bodies 2A and 2B on an abdominal side part A or a back side part B are provided with: two sheets 22 and 23 bonded by many fusion parts 26 formed in a dotted manner; and elastic members 24 passing between the fusion parts 26 and 26. A part of a part 21 of the sheet material 20 configuring the exterior body which is folded to an inner surface of an article along a peripheral edge end of the waist opening covers an inner surface of an end part of the absorbent body and has a bonding area S1 where a vicinity part of the peripheral edge end of the waist opening is a non-bonded area N and which ranges over the whole area between the pair of side seal parts on a crotch part side of the non-bonding area N.SELECTED DRAWING: Figure 2

Description

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

Conventionally, an absorbent main body including an absorbent body and an exterior body positioned on the outer surface side of the absorbent main body are provided, and both sides of the exterior body on the abdominal side and both sides of the exterior body on the back side are joined. A pants-type disposable diaper in which a pair of side seal portions, a waist opening portion, and a pair of leg opening portions are formed is known.
Further, the applicant of the present invention is arranged so that the outer body of the pants-type disposable diaper is joined so as not to pass through the two sheets joined to each other by a large number of fusion parts formed in the form of dots. It has been proposed to constitute an elastic expansion / contraction part provided with a plurality of elastic members (see Patent Document 1).

  In addition, as a pants-type disposable diaper, the sheet material constituting the exterior body is folded back toward the inner surface of the article along the peripheral edge of the waist opening, and the folded portion covers the inner surface of the absorbent main body. Techniques have also been proposed for preventing discomfort caused by the end of the absorbent main body coming into contact with the wearer's skin, and preventing the material of the absorbent body such as the absorbent polymer from leaking out. Patent Document 1 described above also describes that the sheet material constituting the exterior body is folded back toward the inner surface of the article along the peripheral edge of the waist opening.

  In addition, the present applicant joins the peripheral fixed portion that fixes the peripheral edge of the absorbent main body to the opposite surface, the part folded back on the inner surface side of the article in the sheet material constituting the exterior body of the pant-type absorbent article, It has been proposed to avoid joining the vicinity of the side seal portion, the peripheral edge fixing portion, and the inner surface covering portion of the absorbent main body to the opposing surfaces (Patent Document 2).

JP 2009-118986 A JP 2013-116196 A

In the invention described in Patent Document 1, the whole or a part of the elastic member for forming the stretchable part is arranged so as not to be fixed to the two sheets sandwiching the elastic member, whereby two sheets sandwiching the elastic member are arranged. Since the sheet forms unevenness (creases) with excellent flexibility, the touch of the exterior body is improved, and the recesses between the ridges function as air passages, and the air permeability is also improved.
However, as shown in FIG. 9 of Patent Document 1, when the folded portion of the sheet material constituting the exterior body is joined to the opposing members over the entire area, the rigidity of the peripheral edge of the waist opening is high. Therefore, the touch of the peripheral edge of the waist opening may be deteriorated. On the other hand, as in Patent Document 2, if the folded portion of the sheet material constituting the exterior body is not joined to the opposing surface in most of the area between the absorbent main body and the side seal portion, When the wearer is inserted and worn by the wearer, a hand enters the gap between the folded part and the opposite surface, and the fitting cannot be performed smoothly, or the folded part and the absorbent main body There is a possibility that inconveniences such as separation of the bonded portion are likely to occur.

  Therefore, this invention relates to providing the underpants type absorbent article which can solve the solution subject which a prior art has.

  The present invention comprises an absorbent main body including an absorbent body and an exterior body positioned on the outer surface side of the absorbent main body, and both sides of the exterior body on the abdominal side and both sides of the exterior body on the back side, Is a pant-type absorbent article in which a pair of side seal parts, a waist opening part, and a pair of leg opening parts are formed. Two sheets joined to each other at a large number of spot-formed fused parts, and a plurality of elastic members arranged so as not to pass through the fused parts. The sheet material to be configured is folded back toward the inner surface of the article along the peripheral edge of the waist opening, and a part of the folded portion covers the inner surface of the end of the absorbent main body. The portion near the peripheral edge of the waist opening is joined to the opposing member. A non-bonding region, and a bonding region bonded to a member facing each other on the crotch part side from the non-bonding region, and the bonding region covers the entire region between the pair of side seal portions. An underpants-type absorbent article is provided.

  In the pant-type absorbent article of the present invention, the exterior body is soft and comfortable including the peripheral edge of the waist opening, and the back side of the folded portion of the sheet material constituting the exterior body when worn It is also possible to prevent the hand from entering.

FIG. 1 is a perspective view showing a usage state (wearing state) of a pants-type disposable diaper according to the first 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 partially broken enlarged view of the abdomen side of the pant-type disposable diaper shown in FIG. 1 as viewed from the outer surface side of the diaper. 4 is a cross-sectional view taken along the line II of FIG. 5 is a cross-sectional view taken along line II-II in FIG. FIG. 6 shows the arrangement of the unfused portion of the sheet material that forms the exterior body and the preferred arrangement of the adhesive 71 that joins the portion and the folded portion of the sheet material. It is a schematic diagram shown. FIG. 7A and FIG. 7B are plan views showing other coating patterns when the adhesive is applied in the first bonding region.

Hereinafter, the underpants type absorbent article of the present invention will be described based on preferred embodiments with reference to the drawings.
As shown in FIGS. 1 and 2, a pants-type disposable diaper 1 (hereinafter also referred to as diaper 1) that is an embodiment of the present invention includes an absorbent main body 3 including an absorbent body 33, and an absorbent main body 3. The exterior body 2A, 2B located on the outer surface side is provided, and both sides of the exterior body 2A on the abdominal side A and both sides of the exterior body 2B on the back side B are joined together to form a pair of side seal parts 4 4, a waist opening 5 and a pair of leg openings 6 (only one is shown). The abdominal side A is a portion arranged on the wearer's abdomen when worn, the back side B is a portion arranged on the wearer's back when worn, and the crotch C is an abdominal side It is a part located between A and the back side part B, and is distribute | arranged to a wearer's crotch part at the time of wear.

Further, in the diaper 1, both of the exterior body 2 </ b> A on the abdominal side A and the exterior body 2 </ b> B on the back side B are formed by a large number of fused portions 26 formed in a dotted shape as shown in FIG. 3. 4 includes two sheets 22 and 23 joined to each other, and a plurality of elastic members 24 arranged so as to pass through the adhering portions 26 adjacent to each other in the longitudinal direction X of the article. As shown in FIG. 2, in both the exterior body 2A on the abdominal side A and the exterior body 2B on the back side B, the sheet material 20 constituting the exterior body is on the inner surface side of the article along the peripheral edge 51 of the waist opening. The part 21 a of the folded portion 21 covers the inner surface of the end portion of the absorbent main body 3.
As shown in FIGS. 3 and 4, the folded portion 21 of the sheet material 20 is the periphery of the waist opening in both the exterior body 2 </ b> A of the abdominal side A and the exterior body 2 </ b> B of the back side B. The vicinity of the end 51 is a non-joining region N that is not joined to the opposing member, and a joining region S1 joined to the opposing member is provided on the crotch C side from the non-joining region N. The joining region S1 extends over the entire area between the pair of side seal portions 4 and 4.

The diaper 1 of the present embodiment will be described in more detail. The diaper 1 is, as shown in FIGS. 1 and 2, the exterior body 2 and the back side exterior body 2 </ b> A that forms the outer surface of the abdominal side portion A and the back. And a backside exterior body 2B that forms the outer surface of the side portion B. The abdominal exterior body 2A and the back exterior body 2B are rectangular as shown in FIG.
In the diaper 1 of the present embodiment, the sheet material 20 constituting the abdominal exterior body 2A and the back exterior body 2B has a large number of fused portions formed in the form of dots as shown in FIG. 26, two sheets 22 and 23 joined to each other, and a plurality of elastic members 24 arranged so as to pass between adjacent fusion portions 26 in the article longitudinal direction X. The fused part 26 is formed by fusing the two sheets 22 and 23 by heat sealing, ultrasonic sealing, high frequency sealing, or the like.

  In the diaper 1 of the present embodiment, the ventral exterior body 2A and the back exterior body 2B have the same configuration. Therefore, in the following, the configuration of the abdominal exterior body 2A and the back exterior body 2B will be described mainly using the abdominal exterior body 2A as an example, but the same description applies to the back side exterior body 2B.

  As shown in FIG. 3, the ventral exterior body 2 </ b> A includes, as the two sheets 22, 23, an outer layer sheet 22, an inner layer sheet 23 located on the inner surface side adjacent to the outer layer sheet 22, both sheets 22, 23 and a plurality of thread-like elastic members 24 arranged in an extended state, and has a waist elastic part G1 and a waist lower elastic part G2. In the diaper 1, the outer layer sheet 22 is a sheet disposed on the side far from the wearer's skin, and the inner layer sheet 23 is a sheet disposed closer to the wearer's skin than the outer layer sheet 22.

  As shown in FIG. 3, the waist stretchable part G <b> 1 is formed on the outer side of each longitudinal end part 3 a of the absorbent main body 3 in the longitudinal direction X of the diaper 1. The waist elastic part G1 is formed in the peripheral part of the waist opening part 5, and is distribute | arranged to a wearer's waist part at the time of wear. The lower waist extension part G2 is formed below the waist extension part G1 and above the lower end of the side seal part 4 in each of the abdominal exterior body 2A and the back exterior body 2B. In the waist stretchable part G1 and the waistline lower stretchable part G2, the outer layer sheet 22 and the inner layer sheet 23 are joined at a large number of fused portions 26 formed in the form of dots.

  More specifically, as shown in FIG. 2, the waist stretchable part G <b> 1 is intermittently provided with a fusion part 26 in which the outer layer sheet 22 and the inner layer sheet 23 are fused in a line along the article longitudinal direction X. A plurality of fused portion rows R (see FIG. 6) composed of the plurality of fused portions 26 are formed at intervals in the article lateral direction Y. A fuselage portion 26 in which the outer layer sheet 22 and the inner layer sheet 23 are fused is also intermittently formed along the article longitudinal direction X in the waistline lower stretchable portion G2, so that a plurality of fused portions are formed. A plurality of rows of fused portions R each composed of the portions 26 are formed at intervals in the lateral direction Y of the article. In the article side areas S, S, the fused part row R of the waist stretchable part G1 and the fused part row R of the waistline lower stretchable part G2 form a continuous line in the article longitudinal direction X. The article side areas S and S are areas located outside the positions of the side edges 3c and 3c of the absorbent main body 3 and inside the side seal portion 4 in the article lateral direction Y.

  The pitch P (see FIG. 6) of the fused portion row R is preferably 3 mm or more, more preferably 4 mm or more, from the viewpoint of improving the air permeability by forming a recess between the heel and the heel, and the appearance of the heel In view of being able to form and maintain a neat structure neatly, it is preferably 15 mm or less, more preferably 10 mm or less, and from the viewpoint of coexistence thereof, preferably 3 mm or more and 15 mm or less, more preferably 4 mm or more and 10 mm or less. . The pitch P is measured in a state (non-contracted state) in which the stretchable portion is stretched in the lateral direction of the article.

  Moreover, it is preferable that the melt | fusion part 26 is a shape long in the articles | goods longitudinal direction X from the point of the formation property of the beautiful wrinkles extended in an article | item longitudinal direction. More specifically, the fusion part 26 has a ratio (L / w) of the length L in the article longitudinal direction X to the length W in the article transverse direction Y, preferably 1.5 or more, more preferably 2 or more. In addition, it is preferably 12 or less, more preferably 10 or less.

  In the waist stretchable part G1 of the diaper 1 of the present embodiment, the position of the fusion part 26 in the article longitudinal direction X is substantially the same for all the fusion part rows R. The plurality of elastic members 24 are arranged so as to extend in the article lateral direction Y through the gaps between the fusion parts of the plurality of fusion part rows R, respectively. The plurality of elastic members 24 are all disposed between the outer layer sheet 22 and the inner layer sheet 23. Similarly, in the waistline lower stretchable parts G2 and G2, the position of the fusion part 26 in the article longitudinal direction X is substantially the same for all the fusion part rows R. The plurality of elastic members 24 extend in the article lateral direction Y through the gaps between the fusion portions of the plurality of fusion portion rows R, respectively. The plurality of elastic members 24 are all disposed between the outer layer sheet 22 and the inner layer sheet 23.

  In the diaper 1 of the present embodiment, the abdominal exterior body 2A and the back exterior body 2B are both between the outer layer sheet 22 and the inner layer sheet 23 on both sides of the article longitudinal center line (not shown). Has a pair of outer fixing regions 27 joined via an adhesive, and the adhesive between the outer layer sheet 22 and the inner layer sheet 23 is located in the vicinity of the position of the side edge 3c of the absorbent main body 3. It has the main body side fixed area | region 28 joined via. The pair of outer fixing regions 27 are formed at sites spaced from the main body side fixing region 28 to the outside (side seal part side) in the article lateral direction Y of the abdominal exterior body 2A and the back exterior body 2B. More specifically, it is formed at the end in the article lateral direction Y or in the vicinity thereof. The outer fixing region 27 preferably overlaps with the side seal portion 4 in whole or in part.

  A plurality of elastic members 24 are disposed between the pair of outer fixing regions 27 in the waist stretchable part G <b> 1, and the elastic members 24 are seats 22, 23 in the pair of outer fixing regions 27, respectively. On the other hand, between the outer fixed regions 27, it is not fixed to any of the sheets 22 and 23. On the other hand, a plurality of elastic members 24 are arranged between the outer fixed region 27 and the main body side fixed region 28 in the waistline lower stretchable part G2, and these elastic members 24 are arranged in the outer fixed region 27. Between the outer fixed region 27 and the main body side fixing region 28, and is not fixed to any of the sheets 22 and 23.

Further, in the ventral exterior body 2A, as shown in FIG. 3, the sheet material 20 constituting the abdominal exterior body 2A has a peripheral edge 51 of the opening of the waist opening 5 as shown in FIGS. , The inner surface of the diaper 1 is folded back and has a folded portion 21 formed by the folding.
More specifically, as shown in FIGS. 4 and 5, the outer layer sheet 22 and the inner layer sheet 23 both have the inner surface of the diaper 1 folded at the peripheral edge 51 of the waist opening. Further, the length of the folded portion 22 a of the outer layer sheet 22 is longer than the length of the folded portion 23 a of the inner layer sheet 23, and the folded portion 21 of the sheet material 20 is folded back to the outer layer sheet 22. A two-layer part in which the folded part 22a and the folded part 23a of the inner layer sheet 23 are laminated, and a single-layer part consisting only of the folded part 22a of the outer layer sheet 22 are formed. In the two-layer portion, a fused portion row is continuously formed from the waist stretchable portion G1, and the two sheets 22 and 23 are folded back at the fused portion 26 constituting the fused portion row. The portions 22a and 23a are joined.

  As shown in FIGS. 4 and 5, the sheet material 20 constituting the ventral-side exterior body 2 </ b> A has the inner surface of the diaper 1 folded at the peripheral edge 51 of the waist opening 5, and is folded back. The portion 21 is provided. The folded portion 21 extends from the peripheral edge 51 of the waist opening 5 in the crotch portion C direction. In the present embodiment, the folded portion 21 has a rectangular shape. The same applies to the sheet material 20 constituting the backside exterior body 2B.

The folded portion 21 of the sheet material 20 is, as shown in FIGS. 2, 4, and 5, a non-joined region in which the vicinity of the peripheral edge 51 of the waist opening is not joined to the opposing members. N. Regarding the diaper 1 of the present embodiment, the opposing members referred to here are the non-folded portions of the sheet material 20 constituting the exterior body, and more specifically, the surfaces directed to the skin side of the unfolded portions ( Hereinafter, the inner layer sheet 23 is also referred to as a skin side surface.
The non-joining area | region N is extended over the whole region between a pair of side seal parts 4 and 4, as shown in FIG.

By forming the non-joining region N in the vicinity of the peripheral edge 51 of the waist opening 5, the touch of the peripheral edge of the waist opening 5 can be prevented from being deteriorated by the adhesive, and the peripheral edge of the waist opening 5 It is very excellent in the touch and the touch when pressed.
From such a viewpoint, the length L1 of the non-joining region N in the article longitudinal direction X is preferably 1% or more, more preferably 5% or more, and still more preferably with respect to the length L4 of the side seal portion 4 in the same direction. Is 10% or more. Moreover, the fall of the operativity at the time of a wear work (For example, when pulling up the waist opening part 5 if it floats too much, in the non-joining area | region N, the part 21 which is not folded | folded and the part 21 which was folded back | folded) The length L1 is preferably 40% or less, more preferably 35% or less, still more preferably 25% or less with respect to the length L4.
From this point of view, the length L1 of the non-joining region N is preferably 1% or more and 40% or less, more preferably 5% or more and 35% or less, and still more preferably 10% or more and 25% with respect to the length L4. It is as follows. Further, the length L1 of the non-bonded region N is preferably 1 mm or more, more preferably 10 mm or more, and further preferably 20 mm or more. The upper limit varies depending on the size of the diaper and whether it is a baby diaper or an adult diaper, but in any case, the upper limit is preferably 50 mm or less. The length L1 of the non-joining region N is a distance from a peripheral edge 51 of the waist opening to an end of the first joint region S1 described later on the peripheral edge 51 side, and is along the article longitudinal direction X. To measure.

Further, as shown in FIGS. 2, 4 and 5, the folded portion 21 of the sheet material 20 is joined to the opposing member on the crotch C side from the non-joining region N. It has joining area | region S1 and 1st joining area | region S1 is extended over the whole region between a pair of side seal parts 4 and 4. As shown in FIG. Regarding the diaper 1 of the present embodiment, the opposing members here are also inner layer sheets that form a non-folded portion of the sheet material 20 constituting the exterior body, more specifically, a skin side surface of the unfolded portion. 23.
With respect to the non-bonding region N, the first bonding region S1 and the second bonding region S2, the expression of extending across the entire region between the pair of side seal portions 4 and 4 extends substantially over the entire region. The case is also included, for example, the case where it covers the range of 90% or more of the distance between the pair of side seal portions 4 and 4 is also included. However, it is preferable that it covers a range of 95% or more of the distance between the pair of side seal portions 4, 4, and further covers a range of 100% of the distance between the pair of side seal portions 4, 4. preferable.

  In the present embodiment, in the first joining region S1 of the folded portion 21 of the sheet material 20, as shown in FIGS. 4, 5, and 6, the portion of the sheet material 20 that constitutes the exterior body is not folded. And the folded portion 21 are joined together by an adhesive 71 coated with a pattern, and more specifically, joined by an adhesive 71 coated in a spiral pattern.

  By providing a joining region over the entire region between the pair of side seal portions 4 and 4, such as the first joining region S <b> 1 in the present embodiment, on the crotch C side from the non-joining region N, for example, from the leg opening When inserting the hand and pulling out the wearer's leg with the hand, when the diaper 1 is to be worn by the wearer, the hand enters the back side of the folded portion 21 and the wearing cannot be performed smoothly. Can be prevented. In addition, when the folded portion 21 and the absorbent main body 3 are joined, when the hand enters the back side of the folded portion 21, the joined portion peels off, and the end of the absorbent main body 3 is removed. It is also possible to prevent the material from forming the absorber 33 from leaking due to inadequate fixation of the material, and the formation of the absorber 33.

Moreover, in the waist expansion-contraction part G1 of the diaper 1 of this embodiment in a natural state, the elastic member 24 arrange | positioned in the expansion | extension state between the outer layer sheet | seat 22 and the inner layer sheet | seat 23 shrink | contracts, and adjacent melt | fusion part row | line | columns The sheet 22 and the sheet 23 between R are deformed so as to swell in the thickness direction of the exterior body 2, respectively, and a wrinkle made of the sheet 22 is generated between the adjacent fused part rows R on the outer surface side of the diaper 1. A hollow portion (not shown) is formed between the sheets 22 and 23.
On the other hand, on the skin surface side of the folded portion 21 of the sheet material 20, the folded portion 21 is joined to the non-folded portion of the sheet material 20 contracted by the elastic member 24, or A wrinkle is generated by the elastic member 24 which may be arbitrarily arranged in the folded portion 21.
And the shape of the ridge formed on the outer surface side of the exterior body by the elastic member 24 is different from the shape of the ridge formed on the skin surface side of the folded portion 21, whereby the folded portion The touch on the skin side of 21 is further improved.

From the viewpoint of further improving the touch of the folded portion, the first joining region S1 is preferably located on the peripheral edge 51 side of the waist opening portion from the longitudinal end portion 3a of the absorbent main body 3.
Moreover, from the point of the further improvement of the touch of the folded part, 1st joining area | region S1 is pattern-coated so that the adhesive agent 71 may have the arrangement | positioning part and non-arrangement part of the adhesive agent 71, The arrangement pitch P1 of the adhesive 71 in the article lateral direction X is preferably shorter than the pitch P2 of the fusion part 26 in the article transverse direction X. As shown in FIGS. 6, 7 (a) and 7 (b), the arrangement pitch P <b> 1 of the pattern-coated adhesive 71 is the portion closest to the peripheral edge 51 of the waist opening in the adhesive 71. The pitch P1 in the article width direction Y at t, and the distance between corresponding positions is measured. 6, FIG. 7 (a) and FIG. 7 (b), the upper side is the peripheral edge 51 side of the waist opening, and the lower side is the crotch C side.

  In addition, the folded portion 21 of the sheet material 20 of the diaper 1 of the present embodiment is, as shown in FIGS. 2, 4, and 5, a first joint on the crotch C side from the first joint region S <b> 1. The second bonding region S2 has a bonding strength higher than that of the region S1, and the second bonding region S2 also extends over the entire area between the pair of side seal portions 4 and 4. In the second bonding region S2 in the present embodiment, as shown in FIGS. 2 and 4, the folded portion 21 of the sheet material 20 and the inner surface of the absorbent main body 3 are overlapped with the absorbent main body 3. Are joined by an adhesive 72 that is continuously applied to the folded portion 21 of the sheet material 20, and overlaps the absorbent main body 3 as shown in FIGS. 2, 4, and 5. In the portion that is not present, the folded portion 21 of the sheet material 20 and the unfolded portion of the sheet material 20 constituting the exterior body are joined by the same adhesive 72.

By providing the second bonding region S2 having a bonding strength higher than that of the first bonding region S1 on the crotch side from the first bonding region S1, the softness of the skin side surface of the folded portion 21 of the sheet material 20 is improved. On the other hand, it is possible to prevent the folded portion 21 from being peeled off from the unfolded portion of the sheet material 20 and easily entering the back side of the folded portion 21.
Moreover, in the part which the folded-back part 21 and the absorptive main body 3 have overlapped, and its peripheral part, exposure of the absorptive main body 3 during wearing work and during wear can be suppressed, Prevents leakage of absorbent material (pulp, polymer, etc.) from the edges. Moreover, deformation | transformation, such as a shift | offset | difference and turning-up from the sheet | seat material 20 which comprises the exterior body of the absorptive main body 3 by a wearer's movement concerning the absorptive main body 3, or a shift | offset | difference pressure can be suppressed.

The bonding strength between the first bonding region S1 and the second bonding region S2 is measured as follows.
[Measurement method of bonding strength]
The portion including the folded portion 21 of the sheet material 20 of the outer package of the diaper 1 is cut out so as to have a width of 50 mm in the Y direction (the article lateral direction). Next, the folded end portion of the folded back end portion 21 of the cut sample is cut off so that the waist end portion is separated into the skin contact surface side and the non-skin contact surface side.
A mark is preliminarily marked with a magic so that the boundary between the first joining region S1 and the second joining region S2 of the cut sample can be seen. The bonding strength of the cut sample is measured using a tensile tester [trade name: Autograph AGS50A, manufactured by Shimadzu Corporation]. The measurement is performed by sandwiching each of the waist end side divided into the skin contact surface side and the non-skin contact surface side with a chuck, peeling in the direction of 180 °, and the peel strength of the first joint region S1 marked in advance. The maximum strength is defined as the bonding strength of the first bonding region S1. Thereafter, the pre-marked second bonding region S2 is peeled off, and the maximum strength of the peeling strength of the second bonding region S2 is defined as the bonding strength of the second bonding region S2. At that time, measurement is performed at a tensile speed of 300 mm / min, measurement is performed n = 5 times, and the average value is defined as the bonding strength of the region.

  As a method of differentiating the bonding strength between the first bonding region S1 and the second bonding region S2, the adhesive 71 for bonding the first bonding region S1 is pattern-coated, while the second bonding region S2 is bonded. Therefore, it is preferable to apply the adhesive 72 for the coating continuously or to apply the pattern with a pattern having a higher bonding area ratio than the adhesive 71. Pattern coating is a coating method in which an adhesive application part and an adhesive non-application part sandwiched between adhesive application parts occur, and as an example of a pattern coating application pattern, In addition to the spiral pattern, a dot pattern in which the adhesive application part is formed in a dotted pattern, a continuous Ω-shaped pattern in which Ω characters are connected in the horizontal direction, a continuous waveform pattern, and a large number of adhesive application parts are generated in parallel. Although a stripe pattern etc. are mentioned, it is not restrict | limited to these. The bonding area ratio (%) of pattern coating is the ratio of the area of the adhesive application part to the total area of the adhesive application part and the adhesive non-application part sandwiched between the adhesive application parts. The percentage is expressed as a percentage. FIGS. 7A and 7B show examples of dot patterns in which adhesive application portions 70 are formed in the form of dots.

As shown in FIGS. 4 and 5, the folded portion 21 of the sheet material 20 in the diaper 1 of the present embodiment is formed by laminating the folded portion 22 a of the outer layer sheet 22 and the folded portion 23 a of the inner layer sheet 23. The number of sheets stacked is composed of a portion where the number of stacked sheets is two, and a portion of the folded back portion 22a of the outer layer sheet 22 that extends from the lower end of the folded portion 23a of the inner layer sheet 23. The first joining region S1 is formed in a part where the number of stacked sheets is large or partly formed, and the second joining region S2 is composed entirely or partly of sheets. It is formed in a portion where the number of stacked layers is small.
Moreover, a part of 2nd joining area | region S2 is joined on the skin side surface of the edge part of the absorptive main body 3. FIG. Absorbent body during and during wearing work because the second joint region S2 having high joint strength is fixed on the skin side surface of the end of the absorbent body 3 instead of the first joint region S1. 3 can be suppressed, and the bonding strength between the end portion of the absorbent main body 3 and the folded portion 21 can be sufficiently secured, so that there is an advantage that leakage of the absorbent (pulp, polymer, etc.) can be prevented. .

From the viewpoint of ensuring that the above-described one or more effects are more reliably exhibited, the diaper 1 preferably has the following configuration.
The length L2 of the first joining region S1 in the article longitudinal direction X is preferably 5% or more, more preferably 15% or more, and preferably 40% with respect to the length L4 of the side seal portion 4 in the same direction. % Or less, more preferably 30% or less, preferably 5% or more and 40% or less, more preferably 15% or more and 30% or less.
The length of the second joining region S2 in the article longitudinal direction X is preferably 5% or more, more preferably 15% or more, and preferably 40% with respect to the length L4 of the side seal portion 4 in the same direction. Hereinafter, it is more preferably 30% or less, preferably 5% or more and 40% or less, more preferably 15% or more and 30% or less.

  2 and 4, the absorbent main body 3 of the diaper 1 is interposed between a liquid-permeable top sheet 31, a liquid-impermeable or water-repellent back sheet 32, and both sheets 31 and 32. It has the liquid-retaining absorbent 33 arranged, and is formed in a rectangular shape that is long in the longitudinal direction X of the diaper. 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).

  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 for the absorptive main body 3, the one end side (the part which overlaps with the ventral | abdominal exterior body 2A) of a longitudinal direction is fixed to the outer surface of the abdominal exterior body 2A via an adhesive agent (not shown), and the other end of a longitudinal direction The side is fixed to the outer surface of the backside exterior body 2B via an adhesive (not shown).

  The forming material of each part of the diaper 1 will be described. As the absorbent core and core wrap sheet of the top sheet 31, the back sheet 32, and the absorbent body 33, respectively, those conventionally used for this type of absorbent article Similar ones 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.

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 material for forming the elastic members 24 and 35, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the material for forming the elastic material include synthetic rubbers 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.

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, instead of providing the non-joining region N, the first joining region S1, and the second joining region S2 described above on both the ventral exterior body 2A and the back exterior body 2B, the abdominal exterior body 2A and the back side You may provide the non-joining area | region N, 1st joining area | region S1, and 2nd joining area | region S2 only in either one of the exterior bodies 2B. Moreover, you may provide only one of 1st junction area | region S1 and 2nd junction area | region S2 in one or both of 2A of back side exterior bodies, and the back side exterior body 2B.
Moreover, you may form the waist part expansion-contraction part G2 so that the full width of 2 A of ventral | abdominal exterior bodies and / or the back | dorsal exterior body 2B may be covered. Moreover, you may provide the extension part extended below from the lower end of the side seal | sticker part 4 in 2 A of back side exterior bodies, and / or the back side exterior body 2B.
In addition, the sheet material 20 constituting the exterior body is elastic to the crease portion 52 at the peripheral edge of the waist opening and the folded portion 21 of the sheet material 20, for example, a portion indicated by reference numerals 53 and / or 54 in the drawing. The member 24 may be arranged.

In addition, the exterior body may be one that is not divided into the abdominal side exterior body 2A and the back side exterior body 2B, that is, continuous across the abdominal side part A, the crotch part C, and the back side part B. .
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)
2 Exterior body 2A Ventral exterior body (exterior body)
2B Backside exterior body (exterior body)
DESCRIPTION OF SYMBOLS 20 Sheet material which comprises exterior body 21 Folded part of sheet material which comprises exterior body 22 Outer layer sheet 22a Folded part of outer layer sheet 23 Inner layer sheet 23a Folded part of inner layer sheet N Non-joining area S1 1 Bonding area (bonding area)
S2 2nd joining area | region 26 Fusion | bond part 27 Outer side fixing | fixed area 28 Main body side fixing | fixed area | region G1 Waist elastic part G2 Girth lower part elastic part 3 Absorbent main body 31 Surface sheet 32 Back sheet 33 Absorber 4 Side seal part 5 Waist opening part 51 Periphery End 52 crease part 6 leg opening 71, 72 adhesive A abdomen B part dorsal part C crotch

Claims (6)

An absorbent main body including an absorbent body, and an exterior body positioned on the outer surface side of the absorbent main body, both sides of the exterior body on the abdominal side and both sides of the exterior body on the back side are joined, A pants-type absorbent article in which a pair of side seal parts, a waist opening part and a pair of leg opening parts are formed,
The exterior body of at least one of the ventral part and the dorsal part is
Two sheets joined to each other by a large number of fusion parts formed in a dotted shape, and a plurality of elastic members arranged so as to pass between adjacent fusion parts in the longitudinal direction of the article The sheet material constituting the exterior body is folded back toward the inner surface of the article along the peripheral edge of the waist opening, and a part of the folded portion is the inner surface of the end of the absorbent main body. Covering
The folded portion is a non-joined region where the vicinity of the peripheral edge of the waist opening is not joined to the opposing member, and the opposing member is located on the crotch side from the non-joined region. A pants-type absorbent article having a bonding region bonded to the base, and the bonding region extending over the entire region between the pair of side seal portions.   2. The pants according to claim 1, wherein, in a natural state, the shape of the heel formed on the outer surface side of the exterior body by the elastic member is different from the shape of the heel formed on the skin surface side of the folded portion. Mold absorbent article.   The folded portion includes a first bonding region as the bonding region, and a second bonding region that is located on the crotch part side than the first bonding region and has higher bonding strength than the first bonding region. The pants-type absorbent article according to claim 1, wherein the second joining region also extends over the entire area between the pair of side seal portions.   4. The pant-type absorbent article according to claim 3, wherein the first joining region is located on a peripheral edge side of the waist opening portion from an end portion in a longitudinal direction of the absorbent main body.   The first bonding region has an adhesive placement portion and a non-placement portion, and the placement pitch of the adhesive in the article lateral direction is shorter than the pitch of the fusion part in the article transverse direction. 4. The pant-type absorbent article according to 4. The pants-type absorbent article according to claim 3, wherein a part of the second joining region is joined on the skin side surface of the end of the absorbent main body.

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