JP4535980B2 - Pants-type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper.

Conventionally, as a pants-type disposable diaper, in addition to the peripheral portions of the waist opening and the leg opening, the waistline portion located below the peripheral portion of the waist opening is also provided with elastic elasticity by a thread-like elastic member. The thing is known (refer patent document 1).
Conventionally, when elastic stretchability is imparted to a disposable diaper, a stretched thread-like or belt-like elastic member is fixed between two substantially non-stretchable sheets via an adhesive, and then the elastic member A general method is to form a gather by shrinking.
However, if a large amount of adhesive is applied in order to securely fix the elastic member between the sheets, the air permeability and softness are reduced. On the other hand, if the amount of the adhesive is reduced, the elastic member is insufficiently fixed. As a result, the fit and leakage prevention properties are reduced. In order to improve the texture, it is also known that the coating pattern of the adhesive is a pattern that is not full-coated such as spiral, Ω-shape, dot pattern, etc. Even in that case, a considerable amount of bonding An agent and an adhesive area are required, and it is difficult to significantly improve air permeability and softness.

In Patent Document 2, an absorbent insert structure including a liquid-permeable body-side liner, a liquid-impermeable barrier, and an absorbent composite disposed therebetween is applied to a breathable elastomeric nonwoven outer cover. Absorbent underwear with attached structure is described.
However, in the absorbent undergarment of Patent Document 2, since the elastomer non-woven outer cover is in the form of a single sheet, the elastic member is fixed to the waist opening and / or the leg opening to tighten it. When it is going to raise, there exists a problem which the elastic member fixed to the cover gives a wearer an uncomfortable feeling or deteriorates appearance.

JP-A-4-166150 JP-T-1-503473

  Accordingly, an object of the present invention is to provide a pants-type disposable diaper that has a soft diaper outer surface and a good feel, and is excellent in fit and breathability.

  The present invention includes an absorbent body including an absorbent core, and an outer packaging material that is arranged on the non-skin contact surface side of the absorbent body and fixes the absorbent body, and a ventral side portion of the outer packaging material In the pants-type disposable diaper in which the side edges of the back side and the back side are joined together to form a pair of side seals, a waist opening, and a pair of leg openings, the outer packaging material is extended by two pieces. A stretchable sheet is laminated, and at least one of the two extensible sheets has stretchability, and between the two extensible sheets in the ventral side portion and the dorsal side portion, By providing a pants-type disposable diaper characterized in that it is not joined in the whole area or most of the portion except for the “side seal portion and the peripheral edge portions of the waist opening and the leg opening”. Achieved Than is.

  The pants-type disposable diaper of the present invention has a soft diaper outer surface and a good touch, and is excellent in fit and breathability.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The perspective view of one Embodiment of the underpants type disposable diaper of this invention is shown by FIG. FIG. 2 shows a plan view of the developed state of the diaper of FIG. FIG. 3 shows an exploded perspective view of the diaper of FIG. 4 shows a cross-sectional view taken along line II-II in FIG.

  The diaper 1 of the present embodiment has a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining absorbent core 4 interposed between both sheets 2 and 3. In particular, a vertically long absorbent body 10 and an outer packaging material 11 disposed on the back sheet 3 side of the absorbent body 10 are provided.

  The outer packaging material 11 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 11 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 abdomen A and the back B correspond to the longitudinal front and rear ends of the outer packaging material 11, and the crotch C corresponds to the longitudinal center of the outer packaging material 11. The outer packaging material 11 is formed by joining the side edges A1, A2 of the ventral side A and the side edges B1, B2 of the back side B to each other, and the diaper 1 has a waist opening 5 and a pair of leg openings. 6 is formed. By this joining, a pair of side seal portions S, S are formed on the left and right side edges of the diaper 1. For this joining, for example, heat sealing, high frequency sealing, ultrasonic sealing or the like is used.

  The top sheet 2, the back sheet 3, and the absorbent core 4 each have a rectangular shape, and are integrated to form a vertically long absorbent body 10. As the surface sheet 2, the back surface sheet 3, and the absorptive core 4, the thing similar to what was conventionally used for this kind of diaper can be used, respectively. For example, as the absorptive core 4, what is comprised from the particle | grains and fiber material of a superabsorbent polymer, and is coat | covered with the tissue paper (not shown) etc. can be used.

  As shown in FIG. 2, side cuffs 8, 8 made of a liquid-resistant or water-repellent and breathable material are formed on the left and right sides of the absorbent body 10 in the longitudinal direction. In the vicinity of the free end of each side cuff 8, a side cuff elastic member 81 is disposed in an extended state. Thereby, when the diaper 1 assembled as shown in FIG. 1 is worn, the side member cuff 8 stands up due to the elastic member 81 contracting, and the outflow of liquid in the width direction of the absorbent body 10 is prevented. Is done. In FIG. 3, a sheet material for forming the side cuffs 8 and 8 is indicated by reference numeral 82. When the sheet material 82 is in the state of the diaper 1, a portion 82 </ b> S having a predetermined width on the outer side in the width direction of the absorbent main body 10 is wound down to the non-skin contact surface side of the back sheet 3. It is fixed between the material 11.

The outer packaging material 11 in the diaper 1 of the present embodiment has a structure in which two extensible sheets 12 and 13 are laminated, and the two extensible sheets 12 and 13 both have elasticity. Yes. The extensible sheet only needs to be extensible in at least the width direction of the diaper (left and right direction in FIG. 2, hereinafter also referred to as the diaper width direction) when the diaper is in the unfolded state. What is necessary is just to have a stretching property in the width direction.
In the present invention, the extensible sheet means a sheet having a maximum elongation in at least one direction of 100% or more (a sheet having a length extending twice or more). The stretchable sheet is stretchable when the sheet is stretched in one direction where the maximum elongation is 100% or more until the sheet is stretched to 100% elongation and then contracted. (Elongation recovery rate at 100% elongation) means at least 70% or more. In the case where a plurality of directions having a maximum elongation of 100% or more are included, the stretch recovery rate is also 70% or more in only one of the directions.

In the present embodiment, the two extensible sheets 12 and 13 are both extendable in the diaper width direction more than in the longitudinal direction of the diaper (vertical direction in FIG. 2). More specifically, in the diaper width direction, it stretches greatly and contracts after stretching (maximum elongation of 100% or more and elongation recovery rate of 70% or more), but in the diaper longitudinal direction, it stretches only slightly (for example, , Maximum elongation of 50% or less).
In the diaper 1 of the present embodiment, one extensible sheet 12 forms the outer surface of the diaper 1, and the other extensible sheet 13 is disposed on the inner surface side of the extensible sheet 12.
In the unstretched state, the diaper is often designed to be smaller than the infant's body shape, and in order for the mother to wear the diaper on the infant, the outer packaging material preferably has an elongation of 100% or more.
Moreover, by using an elastic sheet having an elongation recovery rate of 70% or more in the diaper width direction, the diaper can be fitted to the body shape, and it is possible to prevent the appearance from slipping or slipping off.

[Method for measuring elongation recovery rate]
A sample piece having a length of 50 mm and a width of 25 mm is prepared, and using a Tensilon device, the sample piece is fixed at the chuck interval L _0, and the length L ₂ at the time of 100% elongation at a speed of 300 mm / min (L ₂ = L After stretching to ₀ × 2), the length of the sample piece when the stress becomes 0 after starting to return at the same speed as the tensile speed is defined as the length L ₁ after the recovery from elongation. The elongation recovery rate at 100% elongation is calculated from the following equation.
Elongation recovery rate at 100% elongation (%) = [(L ₂ −L ₁ ) / (L ₂ −L ₁ )] × 100

In the present invention, the stretchable sheet having stretchability has stretchability even in the direction corresponding to the diaper width direction, even if a plurality of elastic members in the form of threads or narrow strips are not stretched (in a natural state) Sheet which is not substantially wrinkled).
Examples of stretchable sheets having stretchability include (1) a sheet in which stretchable fiber aggregates are integrated on both sides of an elastic fiber sheet composed of elastic fiber aggregates, and (2) a net-like elastic sheet. A sheet in which an extensible fiber aggregate is integrated in a natural state on at least one surface, and (3) an elastic nonwoven fabric sheet composed only of an aggregate of elastic fibers can be preferably used.
The stretchable sheets 12 and 13 having stretchability may be stretchable and stretchable sheets having the same configuration, or may be stretchable and stretchable sheets having different configurations.

The sheet (1) will be described.
Examples of the elastic fiber sheet comprising an aggregate of elastic fibers include styrene butadiene styrene block copolymer (SBS), styrene isoprene styrene block copolymer (SIS), styrene ethylene butylene styrene block copolymer (SEBS), and styrene ethylene propylene. Elastic raw materials such as styrene elastomers such as styrene block copolymers (SEPS), olefin elastomers, polyester elastomers, polyurethane elastomers and the like can be used singly or in combination of two or more. Examples include those obtained by (melting) this raw material into a nonwoven fabric by a spunbond method, a melt blown method, a spinning blown method, or the like.
Examples of stretchable fiber aggregates include fiber webs and non-woven fabrics produced by various manufacturing methods, in which a large number of slits extending in a specific direction are dispersed so as to be stretchable in a direction perpendicular to the specific direction.
As an integration method of the fiber sheet and the extensible fiber assembly, a method of laminating them and tangling the fibers by hydroentanglement or the like, a method of partially bonding with a pattern using an adhesive, a heat roll, or the like A state in which a part of the constituent fibers of the non-elastic fiber layer has entered the elastic fiber layer is preferable, and a method of joining by thermal fusion of fiber intersections can be mentioned. By using such a sheet for both the outer surface of the diaper and both the outer surface and the inner surface, it is possible to realize a pant-type diaper that has good elongation, is soft like a fabric, is supple, and has a smooth touch. The elastic fiber sheet preferably has fine fibers, and the spinning method is preferred as the production method.

The sheet (2) will be described.
As the net-like elastic sheet, there are a base-like sheet formed by using elastic yarn as at least a weft, a base-like sheet formed by arranging a large number of elastic bodies formed by slitting an elastic film, etc. Can be mentioned.
As the fiber assembly that can be stretched, the same fiber assembly as in the sheet (1) can be used. As an integration method of the elastic sheet and the extensible fiber assembly, the same method as the integration method in the sheet of (1) can be used. By using a net-like elastic sheet as the elastic sheet, the strength of the outer surface is high, and it is difficult to cause the outer surface to be broken when the diaper is attached or detached. However, the net-like elastic sheet is preferably flat with no irregularities in terms of touch.

The sheet (3) will be described.
As the sheet (3), an elastic fiber sheet composed of an elastic fiber assembly of the sheet (1) can be used. By using such a sheet, it is possible to realize a pants-type diaper that is easy to stretch and easy to wear.

In the diaper 1 of this embodiment, as shown in FIG.3 and FIG.4, between the two extensible sheet | seats 12 and 13 in each of the ventral | abdominal part A and the back | dorsal part B is side seal part A1, A2, and. In B1 and B2, they are joined to each other by heat sealing, high frequency sealing or ultrasonic sealing, and at the peripheral edge 50 of the waist opening 5 and the peripheral edge 60 of each of the pair of leg openings 6, a hot melt adhesive is used. Are bonded to each other by adhesives 52, 62. And between the two extensible sheets 12 and 13 in each of the ventral portion A and the dorsal portion B is not joined in most of the portions excluding these portions.
Specifically, between the extensible sheets 12 and 13, the side seal portions A 1, A 2, B 1 and B 2, the peripheral edge 50 of the waist opening 5, and the peripheral edge 60 of each of the pair of leg openings 6, It joins in the diaper width direction center part of each of the side part A and the back side part B, and it is not joined in parts other than those.

Thus, in a wide range in the ventral part A and the dorsal part B, the configuration in which the two extensible sheets 12 and 13 are not joined together minimizes the portion where the outer packaging material 11 is hardened by the adhesive. The outer surface of the diaper or the inner surface of the outer packaging material 11 that is not covered with the absorbent main body 10 can be made soft and soft to the touch. In addition, when a breathable sheet is used as the extensible sheet, the breathability is maintained well, so that a diaper that is not stuffy can be provided.
Further, since the stretchable sheets 12 and 13 are joined to each other at the peripheral edge portions 50 and 60 of the waist opening 5 and the pair of leg openings 6, a stretchable outer packaging material is provided at the waistline portion. 11, a suitable fit can be obtained, and a thread-like or belt-like elastic member 51, 61 a, 61 b is sandwiched between both extensible sheets (stretchable sheets) 12, 13 around these peripheral portions 50, 60. By fixing to, the fitting property of these parts can be improved without being restricted by the expansion and contraction characteristics of the outer packaging material 11. Further, since the thread-like or belt-like elastic members 51, 61a, 61b can be fixed in a state of being sandwiched between both extensible sheets (stretchable sheets) 12, 13, such an elastic member is made of a single sheet. Compared with the case of fixing to the elastic member, the elastic member can also prevent the wearer from feeling uncomfortable or deteriorating the appearance.

  A plurality of waist elastic members 51, 51 are arranged along the opening peripheral edge of the waist opening at the peripheral edge 50 of the waist opening in each of the ventral side A and the back side B. These waist elastic members 51 and 51 are fixed in an extended state between the two extensible sheets 12 and 13 via an adhesive 50. In addition, leg elastic members 61a and 61b are also provided along the peripheral edge of each opening on the peripheral edge 60 and 60 of the leg opening that exists across the ventral side A, crotch C and back side B. It is arranged. These leg elastic members 61 a and 61 b are fixed in an extended state between the two extensible sheets 12 and 13 via an adhesive 60. Elastic material such as natural rubber, polyurethane resin, foamed urethane resin, hot melt elastic member, etc. is formed into a thread (thread rubber) or a belt (flat rubber) for the waist elastic member and leg elastic member, respectively. What has been used is preferably used.

  In the diaper 1 of the present embodiment, the width of the region where the two extensible sheets 12 and 13 existing at the peripheral edge of the waist opening are joined is the waist opening for each of the ventral side A and the back side B. It is preferable that it is within 50 mm from the peripheral edges 5a and 5b of the portion, and is preferably within 30 mm from the peripheral edges 5a and 5b of the waist opening. Moreover, the width | variety of the area | region where two sheets of extensible sheet | seats (elastic sheet | seats) 12 and 13 which exist in the peripheral part of a leg opening part are joined is each part of the abdominal part A, the crotch part C, and the back part B. In, it is preferable that it is within 50 mm from the peripheral edge of a leg opening part, and it is preferable that it is within 30 mm from the peripheral edge of a waist opening part.

Moreover, in the diaper width direction in each of the ventral side A and the back side B, the total length (L1 + L2) of the portion where the two extensible sheets 12 and 13 are not joined is determined by the left and right side seal portions A1, The length La (Lb) between A2 is preferably 60% or more, more preferably 70% or more, and further preferably 75% or more.
Moreover, the area of the part which is not joined between the two extensible sheets 12 and 13 in each of the ventral part A and the dorsal part B is 60 with respect to the areas of the ventral part A and the dorsal part B, respectively. It is preferably ~ 100%, more preferably 70-100%. Those satisfying this numerical value are referred to as “whole area or most part”.
The dimensions, ratios, etc. of each part described in this specification are the natural state (external force such as tensile force) when the diaper is in an unfolded state as shown in FIG. 2 and the contraction force by the elastic members of the waist opening and leg opening is released. Or a value based on the value measured in a state in which the

  In the diaper 1 of the present embodiment, the adhesives 62 and 14 are also provided between the two extensible sheets 12 and 13 in the crotch C at the peripheral edge 60 of the leg opening and the diaper width direction center of the crotch C. However, it is not joined in other parts. In the diaper 1 of the present embodiment, as shown in FIG. 2, the leg elastic member for imparting stretchability to the peripheral edge 60 of the leg opening is the center in the width direction of the crotch from the peripheral edge of the leg opening. In this way, the portion where the leg elastic member for imparting stretchability to the leg opening in the circumferential direction is arranged on the peripheral edge 60 of the leg opening. included.

  In the diaper 1 of the present embodiment, since the two extensible sheets 12 and 13 are joined at the center part in the diaper width direction of each of the abdomen A, the back B, and the crotch C, the outer packaging material When the disposal tape is provided on the outer surface of the diaper 11, the disposal tape can be firmly fixed by fixing the disposal tape to the central portion in the diaper width direction. The disposal tape is a tape that holds the diaper in a rolled state, and various conventionally known tapes can be used. In addition, since the two extensible sheets 12 and 13 are joined at the central part in the diaper width direction of each of the ventral part A, the back part B, and the crotch part C, the back sheet 3 has patterns, characters, When symbols such as other symbols are provided, the symbols can be clearly seen from the outer surface side of the diaper. Although the disposal tape and / or design mentioned above may be provided in the diaper 1 of the present embodiment, it is not essential.

In the diaper 1 of the present embodiment, the stretchable sheet 12 constituting the outer surface side of the outer packaging material 11 is elastic to each waist portion by the stretchable sheet 12 and the stretchable sheet 13, as shown in FIGS. As shown in FIGS. 2 and 3, the portions 12a and 12b of the extensible sheet 12 have a length that further extends from the portion where the members 51 and 51 are sandwiched and fixed, and extend from the extensible sheet 13 of the extensible sheet 12. It is folded back to the absorber body 10 side.
As for the absorptive main body 10, the skin contact surface side in the longitudinal direction both ends is covered with the folded-back parts 12a and 12b of the extensible sheet 12. The folded portions 12a and 12b of the extensible sheet 12 have portions that overlap with both ends in the longitudinal direction of the absorbent main body 10 bonded to each other through an adhesive over substantially the entire width of the absorbent main body 10. Thus, both ends in the longitudinal direction of the absorbent main body 10 are fixed to the outer packaging material 11.

As shown in FIGS. 3 and 4, the absorbent main body 10 is bonded to the outer packaging material 11 and the adhesive 15 only at the center in the width direction, as shown in FIGS. Since the expansion and contraction of the outer packaging material 11 is less likely to be hindered by the joining of the absorbent main body 10, a good fit can be obtained at the waistline portion.
The width W1 of the region where the absorbent main body 10 and the outer packaging material 11 are bonded is preferably 20 to 80% of the width W of the absorbent main body 10 in each of the ventral side A and the back side B, More preferably, it is 30 to 70%. If it exceeds 80%, the stretchability is inhibited, and if it is less than 20%, problems such as shaking of the absorber occur.

Next, pants-type disposable diaper as another embodiment of the present invention will be described with reference to FIGS 1 1. In the following description, a different point from the diaper 1 mentioned above is demonstrated, and description is abbreviate | omitted about the same point. About the point which is not mentioned especially, the description regarding the diaper 1 mentioned above is applied suitably. The Figures 5 to 1 1, the same components as the disposable diaper 1 are denoted by the same reference numerals.
In the diaper shown in FIG.5 and FIG.6, the junction part which joins between the two extensible sheets 12 and 13 which comprise the outer packaging material 11 in a diaper width direction center part is not provided. That is, between the two extensible sheets 12 and 13 in the ventral side A and the back side B, respectively, the side seal portions A1, A2, B1, and B2, the peripheral edge portion 50 of the waist opening portion 5, and a pair of leg opening portions. 6 Joined at the respective peripheral edge portions 60 and not joined at other portions. Further, the two extensible sheets 12 and 13 in the crotch part C are not joined in the entire region except for the peripheral edge portions 60 and 60 of the leg opening.

  The absorbent main body 10 in the diaper shown in FIG. 5 is joined to the outer packaging material 11 via an adhesive 15 in substantially the entire region in the longitudinal direction. On the other hand, the absorbent main body in the diaper shown in FIG. 6 (the outline of the absorbent main body is indicated by a two-dot chain line 10 ′) is substantially entirely in the width direction at both ends in the longitudinal direction via the adhesive 16. It is joined to the outer packaging material 11, and only the central portion in the width direction is joined to the outer packaging material 11 via the adhesive 15 in the portion excluding both ends in the longitudinal direction.

  In the diaper shown in FIG. 7, the gap between the two extensible sheets 12 and 13 on the abdominal side A and the back side B is between the side seal portions A 1, A 2, B 1 and B 2, and the peripheral edge of the waist opening 5. 50, in addition to the peripheral edge portion 60 of each of the pair of leg openings 6, the ventral side portion A and the back side portion B are joined at the central portion in the diaper width direction and are not joined at other portions. On the other hand, the two extensible sheets 12 and 13 in the crotch part C are joined at the peripheral edge 60 of each of the pair of leg openings 6 and are not joined at other portions.

  In the diaper shown in FIG. 8, the gap between the two extensible sheets 12 and 13 in each of the abdominal side A and the back side B is between the side seals A 1, A 2, B 1 and B 2, and the peripheral edge of the waist opening 5 50, which are joined at the peripheral edge 60 of each of the pair of leg openings 6, and are not joined at other portions. On the other hand, between the two extensible sheets 12 and 13 in the crotch part C, in addition to the peripheral edge part 60 of each of the pair of leg openings 6, it is joined at the central part in the diaper width direction, Not joined.

  Also in the diaper shown in FIGS. 5 to 8, since the two extensible sheets 12 and 13 constituting the outer packaging material 11 are not joined to each other in a wide range, the outer surface of the diaper is soft and the touch is good, and the fit Excellent in breathability and breathability.

The absorbent main body 10 in the diaper shown in FIGS. 9 and 10 is joined to the outer packaging material 11 only in the center in the width direction, except for both ends in the longitudinal direction.
In the diaper shown in FIG. 9, the portion of the absorbent main body 10 excluding both ends in the longitudinal direction is divided into a ventral region, a central region, and a dorsal region by dividing the longitudinal length of the absorbent main body 10 into three equal parts. In this case, the central part in the width direction in each of the ventral region and the back region is joined to the outer packaging material 11 via the adhesive 15, and in the central region, it is joined to the outer packaging material 11 over the entire width direction. It has not been.
In the diaper shown in FIG. 10, in addition to the joining location of the absorbent main body 10 to the outer packaging material 11 in the diaper shown in FIG. 9, the widthwise central portion in the central region is also joined to the outer packaging material 11 via the adhesive 15. Yes. In the example shown in FIG. 10, the joints in the ventral region, the central region, and the dorsal region are separated from each other.

  When “excluding both ends in the longitudinal direction” with respect to the joining mode of the absorbent main body, the both ends in the longitudinal direction of the absorbent main body are substantially the entire area in the width direction of the absorbent main body (for example, in the embodiment shown in FIG. 90% or more) may be joined to the outer packaging material 11, or only the central portion in the width direction of the absorbent main body may be joined to the outer packaging material 11 as shown in FIG. 3. For example, the longitudinal end portions of the absorbent main body 10 in the diaper shown in FIG. 9 or FIG. 10 are applied to the outer packaging material 11 in substantially the entire width direction (for example, 90% or more) of the absorbent main body as shown in FIG. It can also be joined.

  As for the absorptive main body 10 in the diaper shown in FIG. 11, only the both ends of the longitudinal direction are joined to the outer packaging material 11 via the adhesive agent 16. FIG. In the example shown in FIG. 11, the portion joined to the outer packaging material 11 of the absorbent main body 10 has a distance from each of both ends in the longitudinal direction of the absorbent main body 10 within a range where the total length of the absorbent main body 10 is 10%. Only.

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, the joining mode between the two extensible sheets 12 and 13 in any embodiment described above is combined with the joining mode between the main body 10 and the outer packaging material 11 in any other embodiment described above. Can do. For example, the joining mode between the two extensible sheets 12 and 13 may be the same as the diaper shown in FIG. 1, and the joining mode between the absorbent main body 10 and the outer packaging material 11 may be the same as the diaper shown in FIG. good.
In addition, it is only necessary that at least one of the two extensible sheets 12 and 13 constituting the outer packaging material 11 has elasticity. For example, if the outer packaging material 11 is composed of an extensible sheet having elasticity and an extensible sheet not having elasticity, it can be used as a disposable diaper having good fit. From the viewpoint of keeping the appearance of the diaper clean by suppressing wrinkles and the like, the extensible sheet is preferably an extensible sheet in which the extensible sheet 12 constituting the outside of the diaper has elasticity.

In the disposable diaper 1 described above, both side edges A1, A2 of the ventral side A and both side edges B1, B2 of the back side B are joined to each other to form a side seal portion. Alternatively, it may be pre-engaged with various engaging members such as buttons and hook-and-loop fasteners to form a pants shape. Further, the joining or engaging position between the side edges A1 and A2 of the ventral side A and the side edges B1 and B2 of the back side B is not limited to the position directly beside the body, but is slightly forward or rearward of the body. It may be.
In addition, on the non-skin surface side of the outer packaging material 11 (outer extensibility 12) of the disposable diaper 1 described above, the disposable diaper is fixed by fixing a disposal tape at a position overlapping the adhesive 14 such as a hot melt adhesive. It can also be set as the disposable diaper 1 which can be discarded compactly, maintaining 1 elasticity.

It is a perspective view which shows one Embodiment of the underpants type disposable diaper of this invention. It is a top view which shows the unfolded state of the diaper shown in FIG. It is a disassembled perspective view of the diaper shown in FIG. It is the II-II sectional view taken on the line of FIG. It is a figure (figure 3 equivalent figure) which shows another embodiment of the diaper of this invention. It is a disassembled perspective view which shows only the outer packaging material part in another embodiment of the diaper of this invention. It is a disassembled perspective view which shows only the outer packaging material part in another embodiment of the diaper of this invention. It is a disassembled perspective view which shows only the outer packaging material part in another embodiment of the diaper of this invention. It is a perspective view which shows the joining aspect of the absorptive main body and outer packaging material in another embodiment of the diaper of this invention. It is a perspective view which shows the joining aspect of the absorptive main body and outer packaging material in another embodiment of the diaper of this invention. It is a perspective view which shows the joining aspect of the absorptive main body and outer packaging material in another embodiment of the diaper of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2 Top sheet 3 Back sheet 4 Absorbent core 5 Waist opening 6 Leg opening 10 Absorbent main body 11 Outer packaging material 12, 13 Stretchable sheet having elasticity

Claims (4)

An absorbent body including an absorbent core, and an outer packaging material arranged on the non-skin contact surface side of the absorbent body and fixing the absorbent main body, and an abdominal side portion and a back side portion of the outer packaging material Pants-type disposable diapers in which both side edges are joined to each other, and a pair of side seal portions, a waist opening, and a pair of leg openings are formed,
The outer packaging material has a structure in which two extensible sheets are laminated, and at least one of the two extensible sheets has elasticity.
The two extensible sheets in the abdomen and the dorsal side are joined in the whole area or most of the portions excluding the side seal portion and the peripheral portions of the waist opening and the leg opening. Not
The absorber body is bonded to the outer packaging material only in the width direction center part except for both longitudinal ends thereof .
The disposable diaper has a joining portion in which the two extensible sheets are joined with an adhesive at the center in the width direction, and the disposal tape is fixed at a position overlapping the adhesive on the non-skin surface side of the outer packaging material A pants-type disposable diaper.   Between the two extensible sheets on the ventral side and the dorsal side, the side seal part, the peripheral edge of each of the waist opening and the leg opening, and the ventral side and the dorsal side, respectively. The pants-type disposable diaper according to claim 1, wherein the pants-type disposable diaper is joined at a central portion in the width direction and not joined at other portions. Between the two stretch sheets at the crotch portion between the flank and the rear section are not joined over the entire area or most of the portion except for the periphery of the leg openings claim 1 or 2. A pants-type disposable diaper according to 2. Between the two extensible sheets in the crotch part between the abdominal side part and the dorsal side part, the peripheral edge part of the leg opening part and the width direction center part of the crotch part are joined. The pants-type disposable diaper according to claim 1 , wherein the pants are not joined to each other.

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