JP5049112B2 - Pants-type absorbent article - Google Patents

Description

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

  A technique for preventing a rough touch caused by gathers formed in an opening area around a waist of a disposable diaper and a pain caused by the skin is known. For example, Patent Document 1 describes a disposable diaper provided with covering means extending in the circumferential direction in parallel with an elastic member constituting a gather. The site | part which covers a gather is formed with the liquid-impermeable outer surface sheet, for example, as shown in FIG. This outer surface sheet is bent outward from the diaper at the edge of the opening area around the waist and joined to the outer sheet at a position below the rubber thread constituting the gathers. The outer sheet is further bent upward and extends to the inside of the diaper beyond the edge of the opening area around the waist. And the extended front-end | tip part is joined to the liquid-permeable inner surface sheet in the position below the rubber thread. The gather covering part which consists of a liquid-impervious outer surface sheet covers the gather in the inside and outside of the diaper, and forms a space between the outer surface sheet in the opening area around the waist. Further, a gap is formed between the liquid-permeable inner sheet. It is described in Patent Document 1 that this gather covering portion can eliminate the bad touch of gathers inside and outside the diaper.

  However, in the configuration described in FIG. 3 of Patent Document 1, since the outer sheet that constitutes the gathered portion does not have elasticity, the state of fine wrinkles formed in the gather is on the surface of the gathered portion. It is easy to be reflected. Further, when the diaper contracts, wrinkles are also generated on the outer surface sheet of the gather cover portion, and the wrinkles make the touch worse, and due to the wrinkles, the diaper is less likely to have a clean appearance like a cloth underwear. In addition, since the skin is pressed by another uneven gather on the outer sheet where wrinkles are generated, the wearer may be uncomfortable or uncomfortable and may be itchy.

Japanese Patent Laid-Open No. 10-258082

  The objective of this invention is providing the underpants type absorbent article which can eliminate the fault which the prior art mentioned above has.

The present invention provides a pant-type absorbent article having an opening area around the waist and a pair of opening areas around the legs.
The outer layer sheet forming the outermost surface of the article is folded to the skin facing surface side at the edge of the opening area around the waist, and the folded part and the outer layer sheet facing the line are formed so as to extend around the waist. The sleeve portion extending around the waist is formed by being joined at the shaped joint portion,
In the sleeve portion, an elastic stretchable waistband extending around the waist is arranged so that one side faces the skin-facing surface side and the other side faces the outside.
The waistband has a skin facing surface side joined to the inner surface of the sleeve portion, and an outer surface side thereof is not joined to the inner surface of the sleeve portion,
The present invention provides a pants-type absorbent article using a sheet having elasticity in at least the direction around the waist as the outer layer sheet.

  According to the present invention, the edge region of the opening area around the waist is composed of a sleeve portion made of a stretchable outer layer sheet, and the waistband disposed on the sleeve portion is only on the skin facing surface side. Since it is joined to the inner surface of the sleeve part, the sleeve part and the waistband are kept integrated, and it is difficult for the edge area to be creased. As a result, the edge area exhibits a clean appearance like a cloth underwear, and the softness of the stretchable outer layer sheet makes the skin feel uncomfortable and uncomfortable due to the occurrence of wrinkles in the worn state. Can be improved.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a pants-type disposable diaper 10 as an embodiment of a pants-type absorbent article of the present invention. FIG. 2 is an exploded perspective view showing a state before the diaper shown in FIG. 1 is assembled.

  As shown in FIGS. 1 and 2, the diaper 10 of the present embodiment includes a substantially vertically long absorbent main body 20 and an outer packaging material 30. As shown in FIG. 3, the absorbent main body 20 includes a liquid-permeable top sheet 21, a liquid-impermeable or water-repellent back sheet 22, and a liquid-holding absorbent disposed between the sheets 21 and 22. It has a core 23. The topsheet 21 faces the wearer's skin side when the diaper 10 is worn. The back sheet 22 faces outward when the diaper 10 is worn.

  The top sheet 21, the back sheet 22, and the absorbent core 23 are each rectangular, and are integrated to form a vertically long absorbent main body 20. As the top sheet 21, the back sheet 22, and the absorbent core 23, the same ones that are conventionally used in this type of diaper can be used. For example, as the absorptive core 23, a core composed of superabsorbent polymer particles and a fiber material and covered with tissue paper (not shown) can be used.

  As shown in FIG. 3, side cuffs 24 and 24 made of a liquid-resistant or water-repellent and breathable material are formed on both the left and right sides in the longitudinal direction of the absorbent main body 20. In the vicinity of the free end of each side cuff 24, a side cuff elastic member 25 is disposed in an expanded state. Thereby, in the wearing state of the diaper 10 assembled as shown in FIG. 1, the side cuffs 24 stand up by the side cuff elastic members 25 contracting, and the absorbent main body 20 extends outward in the width direction. Liquid outflow is prevented. As shown in FIG. 3, in the sheet material for forming the side cuffs 24, a portion having a predetermined width on the outer side in the width direction of the absorbent main body 20 is wound down between the absorbent core 23 and the back sheet 22. The absorbent core 23 and the back sheet 22 are sandwiched and fixed.

  As shown in FIG. 2, the outer packaging material 30 is joined to the back sheet 22 side of the absorbent main body 20. The outer packaging material 30 has an hourglass shape in which both side edges are bound inward in the central portion in the longitudinal direction, and defines the outline of the diaper. The outer packaging material 30 is divided in the longitudinal direction into an abdominal side A disposed on the wearer's abdominal side, a back side B disposed on the back side, and a crotch C positioned therebetween. The ventral portion A and the back portion B correspond to the longitudinal front and rear end portions of the outer packaging material 30, and the crotch portion C corresponds to the longitudinal central portion of the outer packaging material 30. Both side edges A1, A2 of the ventral side A in the outer packaging material 30 and both side edges B1, B2 of the back side B are joined together, and a pair of side seals S, S is formed. Thereby, as shown in FIG. 1, the diaper 10 becomes a pants type, and a waist circumference opening area 11 and a pair of leg circumference opening areas 12 are formed. For these bondings, for example, heat sealing, high frequency sealing, ultrasonic sealing, or the like is used.

  The outer packaging material 30 is composed of a laminate of two sheets. The two sheets include an outer layer sheet 31 that forms the outermost surface of the diaper 10 and an inner layer sheet 32 that is positioned immediately inside the outer layer sheet 31. Since the outer layer sheet 31 forms the outermost surface of the diaper 10, a material having a good touch is used as the material thereof. Examples of such materials include various non-woven fabrics. It is preferable to use a non-woven fabric as the inner layer sheet 32 as well.

  As the outer layer sheet 31 in the outer packaging material 30, a sheet having elasticity in at least the direction around the waist is used. On the other hand, a non-stretchable sheet is used as the inner layer sheet 32. The “stretchability” of the outer layer sheet 31 refers to an extensible sheet (a sheet having a length of 1.5 times or more) having a maximum elongation in at least one direction of 50% or more and a maximum elongation of 50% or more. It means that the elongation recovery rate (elongation recovery rate at 50% elongation) when stretched to 100% in one direction and then contracted is at least 70% or more. In the case of an elastic sheet having a plurality of directions having a maximum elongation of 50% or more, the elongation recovery rate may be 70% or more in only one of the directions.

  As the stretchable sheet forming the outer layer sheet 31, various sheets having stretchability can be used. For example, the outer layer sheet 31 is preferably formed of a nonwoven fabric made of thermoplastic fibers from the viewpoint of improving air permeability. In addition, the outer layer sheet 12 is preferably made of a laminated sheet from the viewpoint of improving the texture, and at least the layer on the non-skin contact surface side is formed of an air-through nonwoven fabric. Examples of such a stretchable sheet include those described in Japanese Patent Application Laid-Open No. 2007-154400 related to the earlier application of the present applicant. In particular, since the stretchable sheet provided with stretchability by biting using mutually engaging concavo-convex rolls described in this publication has a regular striped pattern due to the concavo-convex roll, the stretchable sheet It is preferable to use an adhesive sheet as the outer layer sheet because it contributes to improving the appearance of the diaper of the present embodiment. As the uneven roll, for example, linear recesses and protrusions extending in the axial direction of the roll are alternately arranged along the rotation direction of the roll, or those shown in FIG. Can be used. The striped pattern in the stretchable sheet described in the above publication is formed by alternately arranging linear concave and convex portions extending in one direction on the stretchable sheet. The concave portion is formed by densifying the sheet by biting the concave-convex roll.

  As shown in FIG. 2, the outer packaging material 30 extends from the front and rear edges of the absorbent main body 20, and the outer packaging material folded portion 30 </ b> A is formed by folding the extended portions toward the absorbent main body 20. 30B. The folding position F of the outer packaging material 30 is on the outer side (the outer side in the longitudinal direction of the absorbent main body 20) than the arrangement position of the outermost member (closer to the end) among the plurality of waist elastic members 41 described later. is there. As shown in FIG. 4, the outer packaging material folded portions 30 </ b> A and 30 </ b> B include folded portions 31 ′ and 32 ′ of the outer layer sheet 31 and the inner layer sheet 32. The outer packaging material folded portions 30 </ b> A and 30 </ b> B have lengths that straddle the front and rear end edges of the absorbent main body 20, and are joined to the skin-facing surfaces of the absorbent main body 20. Specifically, the outer packaging material folded portions 30 </ b> A and 30 </ b> B are bonded to the front and rear end regions in the longitudinal direction of the absorbent main body 20 through the adhesive 33 over substantially the entire width of the absorbent main body 20. ing. Further, the outer layer sheet 31 ′ and the inner layer sheet 32 ′ are joined by the adhesive 34 in the end regions of the outer packaging material folded portions 30 </ b> A and 30 </ b> B. Thereby, the front and rear end regions in the longitudinal direction of the absorbent main body 20 are fixed to the outer packaging material 30. By forming the outer packaging material folded portions 30 </ b> A and 30 </ b> B, the front and rear end regions of the absorbent main body 20 are prevented from coming into direct contact with the wearer. Further, the water-absorbing polymer contained in the absorbent core 23 is prevented from falling off from the front and rear end regions of the absorbent main body 20.

  A leg elastic member 51 is disposed along the edge of the end region 50 in the end region 50 of the leg opening region 12 existing over the ventral side A, the crotch C, and the back side B. . These leg elastic members 51 are fixed in an extended state between the outer layer sheet 31 and the inner layer sheet 32 via an adhesive (not shown). As the waist elastic member 41 and the leg elastic member 51, for example, a material in which an elastic material such as natural rubber, polyurethane resin, urethane foam resin, hot melt elastic member or the like is formed in a strand shape (elastic strand) or a belt shape is preferable. Used.

  In each of the ventral part A and the back part B, between the outer layer sheet 31 and the inner layer sheet 32 constituting the outer packaging material 30, the side seal parts A1, A2, B1, and B2 are heat sealed and high frequency as described above. They are joined together by a seal or ultrasonic seal. In the end region 40 of the waist opening region 11 and the end region 50 of the leg opening region 12, the outer layer sheet 31 and the inner layer sheet 32 are joined to each other by an adhesive such as a hot melt adhesive. Yes. And in the abdominal part A and the back part B, the outer layer sheet 31 and the inner layer sheet 32 are not joined and are in a state of being separated from each other in most of the region excluding these joined parts. In addition, about the joining state of the outer layer sheet | seat 31 and the inner layer sheet | seat 32 in the edge part area 40 of the waist periphery opening area 11, the detail is mentioned later.

  Thus, in the wide range in the ventral portion A and the back portion B, the outer packaging material 30 is hardened due to the use of the adhesive by adopting a configuration in which the outer layer sheet 31 and the inner layer sheet 32 are separated from each other. Can be minimized. As a result, a portion of the outer surface of the diaper 10 and the inner surface of the outer packaging material 30 that is not covered by the absorbent main body 20 can be made soft and comfortable, and the diaper 10 has an outer appearance of cloth. It becomes like. Moreover, when breathable sheets, such as a nonwoven fabric, are used as the outer layer sheet 31 and the inner layer sheet 32, since the breathability is maintained well, a diaper that is not easily stuffy can be provided.

  In each of the ventral side part A and the back side part B, the area of the part where the outer layer sheet 31 and the inner layer sheet 32 are separated from each other is the area of the outer layer sheet 31 of the ventral side part A and the back side part B. Thus, it is preferably 60% or more, and more preferably 70% or more. Those satisfying this numerical value are referred to as the above-mentioned “most”. This value is a natural state (tension) in which the diaper 10 is cut open at the side seal portion S as shown in FIG. In a state in which no external force such as is applied).

  4 is a cross-sectional view taken along the line IV-IV in FIG. 1, that is, a cross-sectional view of the end region 40 of the opening area around the waist. As shown in the figure, the outer layer sheet 31 and the inner layer sheet 32 constituting the outer packaging material 30 are folded together on the skin facing surface side at the edge T of the opening area around the waist, and the outer packaging material folded portions 30A, 30B. Is forming. The position of the edge T of the opening area around the waist coincides with the folding position F of the outer packaging material 30 shown in FIG. The inner layer sheet 32 ′ and the outer layer sheet 31 ′ forming the outer packaging material folded portions 30 </ b> A and 30 </ b> B are joined to the inner layer sheet 32 and the outer layer sheet 31 facing each other at the linear joining portion 42. The linear joint portion 42 is formed to extend around the waist as shown in FIG. In the joining by the linear joining portion 42, a cylindrical sleeve portion 43 formed by the outer layer sheet 31 is formed in the end region 40 of the waist opening region. The sleeve portion 43 is formed to extend around the waist. The sleeve portion 43 has the same function as the rubber insertion portion formed in the opening area around the waist of the underwear of the fabric. The linear joining portion 42 is formed by joining means such as fusion or adhesion. The linear joint portion 42 may be formed continuously or intermittently. In the case of being formed intermittently, for example, the joining points may be in the form of dots or broken lines, and the joining points may be arranged so as to extend around the waist.

  In the sleeve portion 43, a multi-strand elastic strand (waist elastic member) extending around the waist between the inner layer sheet 32 ′ constituting the outer packaging material folded portions 30A and 30B and the inner layer sheet 32 opposed thereto. 41 is clamped and fixed in an expanded state by an adhesive. The elastic strand 41 extends around the waist. An elastic stretchable waistband 44 having a predetermined width is formed in the sleeve portion 43 by the elastic strands 41 sandwiched and fixed by the inner layer sheets 32 and 32 ′. The waistband 44 functions as a belt-like elastic elastic member having a predetermined width. Therefore, each elastic strand 41 needs to function as a belt-like elastic elastic member in which they are integrated as a whole. From this viewpoint, it is preferable to arrange the elastic strands 41 densely. Specifically, the distance between the elastic strands 41 is preferably 1 to 10 mm, particularly preferably 2 to 7 mm. The width of the waistband 44 (length in the vertical direction shown in FIG. 4) is 5 to 70 mm in terms of the distance between the elastic strand 41 located on the uppermost side and the elastic strand 41 located on the lowermost side. In particular, the thickness is preferably 10 to 40 mm.

  Within the sleeve portion 43, the waistband 44 is arranged so that one surface thereof faces the skin facing surface side of the diaper 10 and the other surface faces the outside of the diaper 10. Furthermore, the waistband 44 is in a state of joining the inner surface of the sleeve portion 43 on the skin facing surface side. That is, in the sleeve portion 43, the inner layer sheet 32 ′ and the outer layer sheet 31 ′ that constitute the outer packaging material folded portions 30 </ b> A and 30 </ b> B are joined to each other on the opposing surfaces. The inner layer sheet 32 ′ and the outer layer sheet 31 ′ may be joined over the entire area of the opposing surfaces of both. Moreover, both may be intermittently joined in the some position in those opposing surfaces. In any case, for example, an adhesive 45 is used for bonding as shown in FIG. Further, the joining may be continuously performed on the entire circumference around the waist, or may be intermittently performed on the entire circumference around the waist.

When joining of inner layer sheet 32 'and outer layer sheet 31' is performed in the whole area of both opposing surfaces, the method of apply | coating a hot-melt-adhesive agent to the whole area of the said opposing surface is used for the joining, for example. It is done. The amount of the hot melt adhesive to be used is preferably as small as possible from the viewpoint of improving the touch and appearance, and from the viewpoint of improving the stretch response of the waistband 44. Specifically, it is preferably 1 to 10 g / m ² .

  The joining of the inner layer sheet 32 ′ and the outer layer sheet 31 ′ is intermittently performed at a plurality of positions on the facing surfaces of the both, which also improves the feel and appearance, and the stretch response of the waistband 44. It is preferable from the viewpoint of improvement. In this case, the joining of both is performed by, for example, a plurality of continuous linear adhesive lines having a width of about 0.5 to 5 mm or a plurality of wavy adhesive lines. The ratio of the bonding area is preferably 20 to 60% with respect to the area of the facing surface. For example, when the width of the facing surface is 20 mm and the continuous linear adhesive portions having a width of 1 mm are arranged in 5 rows at intervals of 3 mm, the ratio of the bonding area is 25%. The bonding area is 1 mm × 5 rows / 20 mm × 100 = 25%. Moreover, it is preferable not to apply an adhesive to a region of the waistband 44 from the end on the edge T side of the waist-opening area to the inside of about 5 mm from the end. Thereby, the site | part close | similar to the edge T of a waist circumference opening area does not become hard, and the deterioration of a touch can be prevented.

  The waistband 44 is different from the skin facing surface side, and the outer surface side thereof is not joined to the inner surface of the sleeve portion 43. In other words, the outer layer sheet 31 and the inner layer sheet 32 are not joined in the end region 40 in the waist opening area.

  As described above, the elastic strands 41 constituting the waistband 44 are clamped and fixed to the inner layer sheets 32, 32 ′ in the stretched state, but the outer layer sheet 31 constituting the sleeve portion 43 is in the stretched state. Similarly, it is joined to the waistband 44 under the extended state. Since the outer layer sheet 31 constituting the sleeve portion 43 has elasticity in the direction around the waist, when the sleeve portion 43 and the waist band 44 are joined together in an expanded state, However, no crease occurs in the sleeve portion 43. Moreover, even if slight crease occurs, it is hard to be visually recognized, so that the appearance of the diaper can be kept clean. In particular, as the outer layer sheet 31, the above-described JP 2007-154400 A, which has been subjected to the biting process of the concavo-convex roll and formed regular vertical stripes, and the vertical stripes coincide with the longitudinal direction of the diaper If the outer layer sheet 31 is arranged as described above, the direction of the vertical stripes and the direction of the pleats are the same, so that the visibility of the pleats is relaxed, and the appearance of the diaper can be kept clean.

The following advantageous effects are produced in the diaper 10 according to the present embodiment because the end region 40 in the opening area around the waist is configured as described above.
(A) Since the outer surface side of the waistband 44 is not joined to the inner surface of the sleeve portion 43, the wrinkled state caused by the shrinkage of the waistband 44 is not easily reflected on the surface of the sleeve portion 43. The end region 40 has a clean appearance like a cloth underwear, and the appearance of the diaper 10 is improved.
(B) The linear joint portion 42 formed at the lower end of the end region 40 visually forms a boundary line between the sleeve portion 43 and a lower portion thereof, and the diaper 10 is more like a cloth underwear Appearance. In addition, the linear joint portion 42 serves as a fulcrum for bending the sleeve portion 43, and when the diaper 10 is spread, the sleeve portion 43 is easily inclined outward from the diaper 10, so that the diaper 10 is easily spread.
(C) When the outer layer sheet 31 is a stretchable sheet and the inner layer sheet 32 (the sheet constituting the gathers) is composed of a general non-stretchable nonwoven fabric, when trying to pull up the diaper when wearing the diaper, Since a pulling force is applied in the vertical direction, each material tends to extend in that direction. At that time, since the elongation of the material in the diaper longitudinal direction of the inner layer sheet 32 (the sheet constituting the gathers) and the outer layer sheet 31 (the stretchable sheet) is different, if the two are not joined together, the waist circumference opening area 11 is integrated. It becomes difficult to maintain the property and the appearance is also deteriorated. Particularly on the skin facing surface side of the diaper, the skin is uncomfortable in a worn state. In addition, the user feels uneasy about strength reduction in the wearing state and cannot wear comfortably. On the other hand, in the configuration of the present embodiment, due to the fact that the outer layer sheet 31 and the inner layer sheet 32 are joined on the skin facing surface side of the diaper, the integrity of both is maintained. As a result, the appearance of the diaper is improved, there is no sense of discomfort in the wearing state, and a sense of security against strength reduction can be obtained.
(D) Since the waistband 44 is made of a wide band-shaped member, the edge area 40 can be easily expanded. Therefore, the diaper 10 can be easily raised and lowered when the diaper 10 is attached and removed.

  Next, 2nd and 3rd embodiment of this invention is described, referring FIG.5 and FIG.6. Regarding the points that are not particularly described with respect to these embodiments, the description regarding the embodiments described in detail above is appropriately applied. 5 and 6, the same members as those in FIGS. 1 to 4 are denoted by the same reference numerals.

  The embodiment shown in FIG. 5 is different from the above-described embodiment in the structure of the linear joint portion 42. In the embodiment described above, the linear joint portion 42 is formed by joining the outer layer sheet 31 and the inner layer sheet 32. On the other hand, in this embodiment, in addition to the linear joining portion 42 being formed by joining the outer layer sheet 31 and the inner layer sheet 32, the elastic strand 46 is stretched at the linear joining portion 42. It is arranged. The elastic strands 46 are arranged at the same positions as the positions where the linear joint portions 42 are formed. According to the present embodiment, due to the contracting action of the elastic strand 46, the linear joint portion 42 becomes clearer as a boundary line between the sleeve portion 43 and a lower portion thereof, and the appearance of the diaper 10 is the fabric. Even closer to underwear. The elastic strand 46 may be joined to the outer layer sheet 31 and / or the inner layer sheet 32 continuously or intermittently across the width direction of the diaper. As a means for intermittently joining the elastic strands 46, for example, a device capable of discharging a hot melt adhesive in an intermittent pattern (for example, a spiral pattern or an omega-shaped pattern) is used, and the hot melt adhesive is applied to the elastic strands 46. A means for applying is mentioned.

  Moreover, according to this embodiment, the sleeve part 43 becomes easy to incline outward of the diaper 10 by the contraction action of the elastic strand 46. From the viewpoint of more easily causing this inclination, the contraction force of the elastic strand 46 is preferably larger than the contraction force of the waistband 44. Specifically, the contraction force of the elastic strand 46 is preferably 1.02 to 2.0 times, particularly 1.05 to 1.5 times the contraction force of the waistband 44. The contraction force of the elastic strand 46 and the waist band 44 is measured by the following method.

<Measurement method of contraction force>
The elastic strand 46 and the waist band 44 are cut out from the diaper 10 across the left and right side seal portions S of the diaper 10. The length L1 in the natural state and the length L2 when the sample is extended to the maximum are measured. The contractile force is calculated from (L2 / L1-1) × 100.

  In the embodiment shown in FIG. 6, the inner layer sheet 32 constituting the outer packaging material 30 terminates at substantially the same position as the edge of the absorbent main body 20. The outer layer sheet 31 extends beyond the edge of the absorbent main body 20 and is folded back toward the skin-facing surface at the edge T of the waist opening area to form outer packaging material folded portions 30A and 30B. The outer edges of the outer packaging material folded portions 30 </ b> A and 30 </ b> B extend beyond the edge of the absorbent main body 20, and are bonded to the skin-facing surface side of the absorbent main body 20 with an adhesive 33. The outer layer sheet 31 ′ forming the outer packaging material folded portions 30 </ b> A and 30 </ b> B is joined to the outer layer sheet 31 opposed thereto at the linear joining portion 42. A sleeve portion 43 formed by the outer layer sheet 31 is formed in the end region 40 of the opening area around the waist by the joining by the linear joining portion 42.

  A waist band 44 is disposed in the sleeve portion 43. The waist band 44 is composed of two belt-like sheets composed of a first belt-like sheet 61 and a second belt-like sheet 62, and multiple elastic strands 41 extending in the extending direction of the sheets 61 and 62. The elastic strand 41 is sandwiched and fixed between 61 and 62. The distance between the elastic strands 41 in the waist band 44 and the width of the waist band 44 are the same as in the embodiment described above. The waistband 44 is joined to the inner surface of the sleeve portion 43 and the adhesive 45 on the skin facing surface side. That is, the skin facing surface side of the waistband 44 is joined to the outer layer sheet 31 ′ constituting the outer packaging material folded portions 30 </ b> A and 30 </ b> B. At this time, the outer layer sheet is joined to the waistband 44 in the stretched state under the stretched state.

  As shown in FIG. 6, in the linear joint portion 42, in addition to the outer layer sheet 31 and the outer layer sheet 31 ′ constituting the outer packaging material folded portions 30 </ b> A and 30 </ b> B being joined, the linear joint portion 42. The elastic strand 47 is arranged in an elongated state. The elastic strands 46 are arranged at the same positions as the positions where the linear joint portions 42 are formed. This configuration is the same as that of the embodiment shown in FIG.

  According to this embodiment, the effect produced by the embodiment shown in FIGS. 1 to 4 and the effect produced by the embodiment shown in FIG. 5 are produced.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in each of the above-described embodiments, a plurality of elastic strands 41 are used as the elastic member constituting the waistband 44. However, instead of this, a single band-shaped elastic body may be used.

  Moreover, in each said embodiment, although the edge part area | region 40 of the waist periphery opening area 11 in both the ventral | abdominal part A and the back | dorsal part B of the diaper 10 had the above-mentioned structure, it replaced with this. The end region 40 in only one of the ventral part A and the dorsal part B may have the above-described structure.

  In addition, a moisture-permeable porous film having a size extending from the front and rear ends of the absorbent main body is arranged immediately inside the outer packaging material 30, and the outer packaging material 30 and the porous film are joined to form a linear shape. The joint portion 42 may be formed. By adopting such a configuration, when the linear joint portion 42 is formed by, for example, fusion, the linear joint portion 42 is formed as compared with the case where the linear joint portion 42 is formed using only the outer packaging material 30. Since it becomes easy to make the joining part 42 transparent, there exists an advantage that the diaper 10 comes to show the external appearance like a further underwear. In addition, since the porous film extends from the front and rear ends of the absorbent main body, there is an advantage that the leak-proof property is further improved.

  Moreover, although the said embodiment is an example which applied this invention to the underpants type disposable diaper, this invention can also be applied to another underpants type absorbent article. For example, the present invention can be applied to a pants-type sanitary napkin, training pants, and bedclothes pants.

It is a perspective view which shows the underpants type disposable diaper as one Embodiment of this invention. It is a disassembled perspective view in the state before assembling the diaper shown in FIG. It is the III-III sectional view taken on the line in FIG. It is the IV-IV sectional view taken on the line in FIG. The figure which shows the cross-sectional structure of the waist periphery opening area which shows the 2nd Embodiment of this invention (it is a figure equivalent to FIG. 4). The figure which shows the cross-sectional structure of the waist periphery opening area which shows the 3rd Embodiment of this invention (FIG. 4 equivalent figure).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pants type disposable diaper 11 Waist circumference opening area 12 Leg circumference opening area 20 Absorbent main body 30 Outer packaging material 31 Outer layer sheet 32 Inner layer sheet 40 End area 41 Elastic strand 42 Linear joint part 43 Sleeve part 44 Waist band

Claims (4)

In a pants-type absorbent article having a waist opening area and a pair of leg opening areas,
The outer layer sheet forming the outermost surface of the article and the inner layer sheet disposed immediately inside thereof are folded back together on the skin facing surface side at the edge of the opening area around the waist, and the folded inner layer sheet and the outer layer sheet , The sleeve layer extending around the waist is formed by joining the inner layer sheet and the outer layer sheet facing each other at a linear joint formed so as to extend around the waist.
Oite within the sleeve portion, between the inner layer sheet facing site and to that folded with the inner layer sheet, multiple-start of elastic strands extending around the waist is clamped fixed elastically stretchable waistband is formed The waistband is arranged so that one side faces the skin-facing surface side and the other side faces the outside.
The waistband has a skin facing surface side joined to the inner surface of the sleeve portion, and an outer surface side thereof is not joined to the inner surface of the sleeve portion,
The folded portion of the inner layer sheet and the folded portion of the outer layer sheet are in a joined state,
A pants-type absorbent article using the outer layer sheet having stretchability at least in the direction around the waist. The pants-type absorbent article according to claim 1 , wherein the linear joint is formed by fusion bonding. The pants-type absorbent article according to claim 1 or 2 , wherein elastic strands are arranged in an elongated state at the linear joint. The pants-type absorbent article according to claim 3 , wherein the contraction force of the elastic strands of the linear joint is greater than the contraction force of the waistband.

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