JP5177455B2 - Disposable paper diapers - Google Patents

Description

  The present invention comprises an absorbent main body in which an absorbent body is interposed between a liquid-permeable top sheet and a back sheet, and integrally joined to the absorbent main body to constitute a front body and a back body, and a front body The present invention relates to a disposable paper diaper constituted by an outer sheet in which a large number of elastic elastic members are disposed between at least a waist portion and a waistline portion between an upper layer nonwoven fabric and a lower layer nonwoven fabric in respective regions of the back and back bodies.

  Conventionally, an absorbent main body in which an absorbent body is interposed between a liquid-permeable top sheet and a back sheet, and a waist part and a waist part part between an upper layer nonwoven fabric and a lower layer nonwoven fabric in each of a front body and a back body There is known a paper diaper composed of an exterior sheet in which a large number of elastic elastic members are disposed along the outer periphery of the outer periphery.

  On the other hand, in Patent Document 1 below, a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent interposed between the two sheets are provided. In a pants-type disposable diaper formed by connecting left and right side parts of a side part via a pair of left and right side panels, the side panel has a net-like sheet having stretch elasticity and at least one side of the net-like sheet. A pants-type disposable diaper formed of a fabric made of laminated fiber assemblies is disclosed.

JP-A-9-285487

  However, in the disposable diaper described in Patent Document 1, since a fabric composed of a net-like sheet and a fiber assembly is used as a side panel, not only the stretching force along the trunk but also the longitudinal direction of the diaper. However, there is a problem that manufacturing of the side panel takes time and manufacturing cost is increased, although it is possible to make the diaper excellent in fit.

  Therefore, the main problem of the present invention is to reduce the manufacturing cost by simplifying the structure and to improve the liquid leakage preventing effect by improving the fit.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent main body in which an absorbent body is interposed between a liquid-permeable top sheet and a back sheet, and the absorbent main body are integrally joined. In addition, in the respective regions of the front body and the back body, a large number of thread-like elastic elastic members are arranged between the upper layer nonwoven fabric and the lower layer nonwoven fabric along at least the waist portion and the waist portion in the diaper width. It consists of an exterior sheet placed and fixed under extension in the direction,
The exterior sheet is divided into an exterior sheet for a front body and an exterior sheet for a back body, and the exterior sheet of the front body and / or the back body is a diaper with respect to the absorbent main body at a central part in a diaper width direction. By joining in the longitudinal direction and in the crotch side direction in a stretched state, the longitudinal dimension in the central part of the diaper width direction is longer than the longitudinal dimension in both sides of the diaper width direction,
By using a material that is extensible in the diaper longitudinal direction as the upper layer nonwoven fabric and the lower layer nonwoven fabric of the exterior sheet, and using a material that can be stretched in the diaper longitudinal direction in at least one of the upper layer nonwoven fabric and the lower layer nonwoven fabric. A disposable paper diaper is provided in which stretchability in the longitudinal direction of the diaper is imparted to at least a portion of the exterior sheet that does not overlap the absorbent main body.

In the first aspect of the invention, the outer body sheet of the front body and / or the back body is joined to the absorbent main body in a stretched state in the longitudinal direction of the diaper and in the crotch side. At the edge part of the crotch side direction of the exterior sheet of the back body, a leg circumference line is formed along the leg circumference from the joining edge with the absorbent main body to the side edge. For this reason, the cutting process which cut | disconnects a leg circumference cut line by the roll cutter etc. to the conventional exterior sheet of the front body and / or back body becomes unnecessary, and simplification of a manufacturing process can be aimed at. Further, since the leg circumference line can be formed without cutting the material, the material can be saved and the amount of waste can be reduced. Further, since the front and / or rear body exterior sheets are not cut as in the prior art, the elastic elastic members in the opening around the legs are not particularly cut, and the front and / or rear body exterior sheets are in the longitudinal direction of the diaper. Since the elastic elastic members arranged along the waist part of the outer body sheet of the front body and / or the back body bend along the line around the leg by being joined to each other in a stretched state, particularly around the leg The fitting performance of each body is improved at each stage, and the effect of preventing leakage of body fluid from the legs is improved.

Further, in the present invention, as the upper layer nonwoven fabric and the lower layer nonwoven fabric of the exterior sheet, a material that can be stretched in the diaper longitudinal direction is used, and at least one of the upper layer nonwoven fabric and the lower layer nonwoven fabric can be stretched in the diaper longitudinal direction. By using the material, the stretchability in the longitudinal direction of the diaper is imparted to at least a portion of the exterior sheet that does not overlap the absorbent main body.

  Accordingly, both side portions of the exterior sheet are provided with a large number of elastic stretch members along the waist portion and the waistline portion, and are provided with stretchability in the longitudinal direction of the diaper. It fits to the body by the stretching force that prevents it from slipping down.

As the present invention according to claim 2 , a crotch outer sheet connecting the rear body outer sheet and the front body outer sheet is disposed only in the crotch part on the back sheet side of the absorbent main body. A disposable paper diaper according to claim 1 is provided.

According to the second aspect of the present invention, the crotch outer sheet is provided only in the crotch part so as to connect the rear body outer sheet and the front body outer sheet that are spaced apart from each other. By comprising in this way, when pulling up a diaper upward at the time of diaper mounting | wearing, the joint edge part of the crotch side direction of the exterior sheet for back bodies and the exterior sheet for front bodies, and an absorptive main body becomes difficult to peel off.

As the present invention according to claim 3, there is provided the disposable paper diaper according to claim 2 , wherein the crotch outer sheet is provided so that the dimension in the diaper width direction is longer than that of the absorbent main body.

According to the third aspect of the present invention, the crotch outer sheet is provided wider than the absorbent main body (so that the diaper width direction dimension is longer), and both side parts of the crotch outer sheet are the side edges of the absorbent main body. The diaper is configured to extend outward in the diaper width direction. Thereby, in the extension part of the said diaper width direction, since the exterior sheet for the back body and the exterior sheet for the front body connected via the crotch outer sheet come to fit together while attracting each other preferable.

As the present invention according to claim 4, there is provided the disposable paper diaper according to any one of claims 2 and 3 , wherein elastic stretch members are disposed on both sides of the crotch outer sheet.

In the invention according to the fourth aspect , elastic stretchable members are arranged and fixed in the longitudinal direction of the diaper on both sides of the crotch outer sheet 19 under extension. If comprised in this way, since the fitting property to a body improves along the longitudinal direction of an absorptive main body, it is preferable.

  As described above in detail, according to the present invention, the manufacturing cost can be reduced by simplifying the structure, and the liquid leakage preventing effect by improving the fit property can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a product external view of the disposable paper diaper 1 which concerns on this invention. It is the development view. FIG. It is the IV-IV arrow line view of FIG. FIG. 5 is a view taken along line VV in FIG. 2. It is the IV-IV line arrow directional view of FIG. 2 in a product state. It is a disassembled perspective view of the absorptive main body 10, the back body exterior sheet 20, and the front body exterior sheet 30. It is an expanded view of the paper diaper 1 which shows another example (the 1). It is an expanded view of the paper diaper 1 which shows another example of a form (the 2). It is a top view of the continuous sheet for exterior sheets before and after the widening process which shows the arrangement | sequence pattern (the 1) of the cutting part. It is a top view of the continuous sheet for exterior sheets before and after the widening process which shows the arrangement pattern (the 2) of the cutting part. It is a manufacturing procedure figure which shows the manufacturing method of the paper diaper.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present invention, the “diaper longitudinal direction” means a direction connecting the stomach side and the back side of the diaper (front-rear direction when the diaper is deployed), and “diaper width direction” is a direction orthogonal to the longitudinal direction (diaper Means the horizontal direction when unfolding.

[Structure of paper diaper 1]
FIG. 1 is a product state appearance view of a disposable paper diaper 1 according to the present invention, FIG. 2 is a development view thereof, FIG. 3 is a rear view thereof, FIG. 4 is a view taken along line IV-IV in FIG. It is a VV arrow line view of 2. In addition, the adhesion | attachment site | part is clearly shown by x mark in the required site | part of drawing.

  A disposable paper diaper 1 (hereinafter simply referred to as a paper diaper) according to the present invention includes a front body F that covers the abdomen and its sides when worn, a back body B that covers the buttocks and back and both sides when worn, and a space between these body parts. The absorbent main body is formed by interposing an absorbent body 13 made of cotton-like pulp between a liquid-permeable surface sheet 11 made of nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. 10 and the absorbent main body 10 are integrally joined to form at least the front body F and the back body B, and are spaced apart from each other in the front body F and the back body B. It is comprised from exterior sheet | seats 20 and 30 by which many elastic elastic members were arrange | positioned along a waist part and a trunk periphery part between lower layer nonwoven fabrics. Moreover, it is preferable to arrange the crotch outer sheet 19 on the outer surface side of the absorbent main body 10 in the crotch portion between the rear body outer sheet 20 and the front body outer sheet 30. And the front body F and the back body B of the said exterior | packing sheets 20 and 30 are joined in the junction parts 40 and 40 of both sides, The pants type | mold by which the waist opening part and the left-right paired leg opening part were formed, It has become.

  In the paper diaper 1 according to the present invention, the outer sheet has a large number of elastic elastic members 26, 28, ... disposed at least along the waist portion 23 and the waist portion 24 between the upper nonwoven fabric 21A and the lower nonwoven fabric 21B, A large number of elastic elastic members 25 along the waist portion 21 and the waistline portion 22 between the rear body exterior sheet 20 joined to the rear body B side of the absorbent main body 10, and the upper nonwoven fabric 31A and the lower nonwoven fabric 31B, 27 ... is arranged, and is constituted by a two-divided sheet comprising a front body exterior sheet 30 joined to the front body F side of the absorbent main body 10.

  Hereinafter, the structure of the absorptive main body 10, the exterior sheets 20 and 30, and the crotch exterior sheet 19, the assembly structure, and the manufacturing method will be described in order.

(Structure of the absorbent main body 10)
First, an example of the structure of the absorbent main body 10 will be described in detail with reference to FIGS.

As described above, the absorbent main body 10 includes a fiber aggregate such as cotton-like pulp and a superabsorbent polymer between the liquid-permeable top sheet 11 made of nonwoven fabric and the like and the back sheet 12 made of polyethylene or the like. It has a structure in which an absorbent body 13 made of a highly absorbent material is interposed, and absorbs and holds bodily fluids. The absorbent body 13 is preferably a basis weight of about 50~600g / ^{m 2,} about 300 to 500 g / ^{m 2} is more preferable.

  Examples of the superabsorbent polymer include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process, the superabsorbent polymer having the water absorption capability can adjust the water absorption (absorption capacity) and the water absorption speed by adjusting the crosslink density and the crosslink density gradient. The content ratio of the superabsorbent polymer in the absorbent body 13 is suitably about 30 to 70%, but is not limited thereto. Also, in the illustrated example, a shape formed with a substantially square shape in plan view is used, and the width dimension is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion.

The absorber 13 is surrounded by the encapsulating sheet 14. As the encapsulating sheet 14, a paper material such as tissue or a liquid-permeable sheet such as a nonwoven fabric can be used. The thickness is preferably about 0.05 to 0.5 mm, more preferably about 0.05 to 0.2 mm. The basis weight is preferably about 5 to 25 g / ^{m 2,} about 5 to 15 g / ^{m 2} is more preferable. When using a non-woven fabric, a non-woven fabric processed by a spunbond method or an SMS method, particularly a non-woven fabric processed by an SMS method, is preferred because of its excellent balance between thinness and strength. In addition, as long as the surface of the absorber 13 at least the surface side (skin contact surface side) of the encapsulating sheet 14 is not water-repellent, the hydrophilicity of the sheet is not particularly limited.

As the liquid-permeable top sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, an SMS method, a thermal bond method, an air through method, a point bond method, a melt blown method, or a needle punch method can be used. In particular, non-woven fabrics processed by the spunbond method or SMS method are suitable in terms of excellent balance between thinness and strength in order to make it easy to detect temperature changes from the surface side, and non-woven fabrics processed by the air-through method are low. Even the basis weight is suitable because of quick absorption and excellent dry touch properties. These may be a sheet made of two or more layers in a sheet composed of a single layer (the same type or plural types) but, as the basis weight of the total, preferably from 10 to 40 g / ^{m 2,} more preferably 10~22g / ^{m 2} 10 to 15 g / m ² is particularly preferable. The thickness is preferably 1 mm or less, more preferably 0.5 mm or less, and particularly preferably 0.3 mm or less. When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 extends to the back side of the absorbent body 13 around the side edge of the absorbent body 13.

As the back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impervious plastic sheet such as polyethylene or polypropylene is used, but in recent years, it has moisture permeability from the viewpoint of preventing stuffiness. Are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility. Specifically, the moisture permeability measured according to JIS Z0208 is 3000 to 12000 g / m ² · 24 hr, preferably 6000 to 12000 g / m ² · 24 hr, more preferably 8000 to 12000 g / m ² · 24 hr. It is desirable to use a liquid sheet.

  On the other hand, the gathered nonwoven fabric 15 that forms the three-dimensional gathered BS is a nonwoven fabric that is turned into a double sheet by folding, and the side edge of the absorbent body 13 that is wound by the liquid-permeable top sheet 11 is further wound from above. The absorber 13 extends to the back side and is bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion at the middle portion in the longitudinal direction of the paper diaper, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and the portion forming the three-dimensional gather BS is the absorber. While being folded at the upper surface portion of 13, it is bonded by a hot melt adhesive or the like.

  In the gathered nonwoven fabric 15 formed of the double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... Are disposed at the standing tip side portion, and in the vicinity of the side edge portion of the absorbent body 13. A thread-like elastic expansion / contraction member 17 is disposed, and a thread-like elastic expansion / contraction member 18 is disposed on the back side of the absorber 13. The tip elastic elastic members 16, 16... Are mainly used to form a three-dimensional gather BS by raising a nonwoven fabric portion protruding from the absorber side edge portion by elastic elastic force. As shown in the product state diagram of FIG. 6, mainly the elastic expansion and contraction force 17 and 18 bend the side portion of the absorber 13, and the side portion of the absorber 13 allows the base end side portion of the three-dimensional gather BS to be bent. It is for composition. The standing height HL of the absorber 13 from the bent portion to the absorber side edge is 5 to 30 mm, preferably 20 to 30 mm. When the standing height HL is less than 5 mm, it is too short to make it difficult to bend the absorber side, and it is impossible to ensure sufficient fit to the skin. Further, when the standing height HL exceeds 30 mm, there arises a problem that the standing length is too long to bend effectively.

  As the thread-like elastic elastic member 17, a material such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, or the like that is usually used can be used. The thickness is suitably about 470 to 940 dtex, and is preferably 620 dtex or less in order to make it difficult to see from the outside. Further, it is preferable that the tension (extension rate) is 150 to 350%. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

In the same manner as the liquid-permeable top sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is made of synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, regenerated fibers such as rayon or cupra, A natural fiber such as cotton can be used, and a nonwoven fabric obtained by an appropriate processing method such as a spunbond method, an SMS method, a thermal bond method, an air-through method, a point bond method, a melt blown method, or a needle punch method can be used. However, in particular, when the layer 31 containing the temperature change substance 30 is arranged on the side, in order to make it easy to detect temperature change from the side, and to prevent stuffiness, the basis weight is suppressed and air permeability is reduced. It is preferable to use a non-woven fabric that excels in resistance. Specifically, the non-woven fabric processing method is suitable by the spunbond method or the SMS method in terms of excellent balance between thinness and strength, and the basis weight is preferably 8 to 30 g / m ² , and 10 to 22 g. / M ² is more preferable, and 10 to 15 g / m ² is particularly preferable. The thickness is preferably 0.5 mm or less, more preferably 0.3 mm or less, and particularly preferably 0.2 mm or less. Furthermore, with respect to the gathered nonwoven fabric 16, in order to prevent permeation of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent You may use the water-repellent treatment nonwoven fabric which coated etc.

(Structure of exterior sheets 20 and 30)
The outer body sheet 20 for the back body includes two upper-layer nonwoven fabrics 21A and 21B nonwoven fabrics 21B made of nonwoven fabric and the like, and waist elastic elastic members 26, 26 arranged and fixed at least around the waist opening 23 between them. And a plurality of waist elastic elastic members 28, 28, which are arranged and fixed under extension along the horizontal direction at intervals in the vertical direction of the waist portion 24. In addition, concave leg-around lines 29 and 29 for forming leg openings are formed at portions corresponding to both sides of the diaper middle.

  The front body exterior sheet 30 includes two upper-layer nonwoven fabrics 31A and lower-layer nonwoven fabrics 31B made of nonwoven fabric and the like, and at least waist elastic elastic members 25, 25,. A plurality of waist elastic elastic members 27, 27,... Arranged along the horizontal direction at intervals in the vertical direction of the peripheral portion 22. In addition, concave leg-around lines 39, 39 for forming leg openings are formed at portions corresponding to both sides of the diaper middle.

  The constituent materials of the upper nonwoven fabrics 21A and 31A and the lower nonwoven fabrics 21B and 31B include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, and natural materials such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, or a needle punch method can be used. In addition, a core-sheath type bicomponent nonwoven fabric using a fiber having a high melting point as a core and a fiber having a low melting point as a sheath, or a nonwoven fabric made of a composite fiber such as a side-by-side fiber or a split fiber can be used. The bicomponent nonwoven fabric is preferable because it can be excellent in heat-fusibility. Further, as will be described in detail later, the upper layer nonwoven fabric 21A and the lower layer nonwoven fabric 21B can be made of a material having a stretching function in order to impart stretchability to the exterior sheet.

  The upper layer nonwoven fabric 21A and the lower layer nonwoven fabric 21B are preferably bonded with a hot melt adhesive or the like over substantially the entire surface of the region where the elastic elastic member is disposed. By doing so, when it cut | disconnects finely as mentioned later, since the fragment | piece of an elastic elastic member does not move between sheets, it is preferable. Further, in order to further secure the elastic elastic member, a hot melt adhesive is applied to the peripheral surface of the elastic elastic member by a known direct application method such as control seam application, omega application or sure wrap application, May be strengthened. If the adhesive strength is excessively strengthened, the elastic elastic member cut finely may cause the exterior sheet to shrink finely, thereby impairing the appearance. In such a case, the hot melt adhesive may be directly applied to the elastic elastic member only at the site where the adhesive force needs to be strengthened.

  In the present invention, the rear body exterior sheet 20 and the front body exterior sheet 30 are each provided with stretchability in the longitudinal direction of the diaper by a predetermined stretchability imparting means. Thus, in order to give the outer sheet | seats 20 and 30 the elasticity of a diaper longitudinal direction, the raw material which can be expanded-contracted in a diaper longitudinal direction can be used as said upper layer nonwoven fabric 21A, 31A and lower layer nonwoven fabric 21B, 31B. Here, the material that can be stretched in the longitudinal direction of the diaper refers to a material that has an elongation of at least 50% and recovers to an original length after stress release, that is, has a low distortion characteristic. More specifically, the elongation rate under a load of 10 N / 50 mm is 50% or more, and the residual strain rate after 50% elongation is 25% or less, preferably 10% or less. In addition, in order for both side portions of the exterior sheets 20 and 30 to obtain a good contraction force in the diaper longitudinal direction, at least one of the upper layer nonwoven fabrics 21A and 31A and the lower layer nonwoven fabrics 21B and 31B is made of a stretchable material. Among them, a material that can be elastically stretched is particularly preferable. Specifically, the elastic stretchable material is a stretchable material, and a return stress (return power) at an elongation rate of 40% is 1.0 N / 50 mm or more, preferably 2.5 N / 50 mm or more. It is a material.

  The elongation rate under the load and the return stress at the time of elongation are measured by a tensile test. In the tensile test, using a tensile tester (AUTOGRAPH AGS-G100N manufactured by SHIMADZU) at room temperature, set a test piece with a width of 50 mm (length: 200 mm) with a grip interval of 150 mm without any slack. Pull at a speed of 500 mm / min.

  The elongation rate under a load of 10 N / 50 mm is that the sample is pulled until the stress between grips starts from 0 N and reaches 10 N or more (for example, 11 N), and the relationship between the grip interval and the stress is recorded. It calculates | requires by following Formula from the grip space | interval L1 at the time of 10N. When the sheet breaks before the stress between the grips reaches 10N, the grip interval at the time of breakage is calculated as L1.

Elongation rate under load (%) = {(L1-150) / 150} × 100
When the elongation rate is 40%, the return stress starts from the grip interval of 150 mm, pulls the sample until it reaches 225 mm, and immediately returns (without resting) to 150 mm (at the same speed). And the stress when the grip interval returns from 225 mm (50% stretched state) to 210 mm (40% stretched state).

  Further, the residual strain rate after 50% elongation is obtained by the following equation from the grip interval L2 when the elongation stress between the grips becomes 0 (or less than 0.005N) during the return stress measurement in the above return stress measurement.

Residual strain rate (%) = {(L2-150) / 150} × 100
In addition, only one of the upper nonwoven fabrics 21A and 31A and the lower nonwoven fabrics 21B and 31B may be used as the material that can be expanded and contracted in the longitudinal direction of the diaper. A possible material may be used. Here, a material that can only be stretched in the longitudinal direction of the diaper is a material having an elongation of at least 50%, the length hardly recovers after the stress is released, and a strain that is at least about half of the elongation after the stress is released. Refers to those having high distortion characteristics. More specifically, the elongation rate under a load of 10 N / 50 mm is 50% or more, and the residual strain rate after 50% elongation is 25% or more. Here, “stretchability” in the present invention is defined as having both “extensible” and “shrinkable” characteristics.

  Further, the upper nonwoven fabric 21A, 31A and the lower nonwoven fabric 21B, 31B may be stretchable in the longitudinal direction of the diaper, or may be stretchable only, and the tensile strength in the longitudinal direction of the diaper is 5 N / 50 mm or more. In particular, it is preferably 10 N / 50 mm or more.

  As a material that can be stretched in the longitudinal direction of the diaper or a material that can be stretched in the longitudinal direction of the diaper, the nonwoven fabric that is stretchable in at least one direction, specifically, polyurethane, polyolefin, polyester, polyamide, etc. A non-woven fabric composed of long fibers made of an elastic resin material that is easily reversibly plastically deformed, or the fiber diameter of the fiber itself does not change when stretched, but a zigzag or spiral crimp is formed, A nonwoven fabric or the like that exhibits stretchability by extending the crimps can be used.

  Further, in order to give the outer sheets 20 and 30 stretchability in the longitudinal direction of the diaper, the outer sheet 20 for the back body will be described in detail as an example, and as shown in FIG. As at least the waist elastic elastic member group arranged between the elastic members 21B, a net-like elastic elastic member 28A composed of warp yarns 28a and weft yarns 28b can be arranged and fixed under extension. Thereby, even if it does not use the raw material which can be expanded-contracted in a diaper longitudinal direction as a constituent nonwoven fabric of the said exterior sheet 20, it becomes possible to provide a stretching property simultaneously in a diaper width direction and a diaper longitudinal direction. The warp yarns 28a and the weft yarns 28b may be arranged so as to cross different thread-like elastic elastic members, thereby forming a net-like elastic elastic member 28A. When using the net-like elastic elastic member 28A, a material that can only be stretched in the longitudinal direction of the diaper may be used for both the upper nonwoven fabric 21A and the lower nonwoven fabric 21B. If it does so, since the said net-like elastic expansion-contraction member 28A can be arrange | positioned and fixed, without extending in a diaper longitudinal direction at least, manufacture is easy. On the other hand, the net-like elastic stretchable member 28A may be arranged around the trunk after using the above-mentioned material that can be stretched in the longitudinal direction of the diaper as the upper layer nonwoven fabric 21A and / or the lower layer nonwoven fabric 21B. The elastic elastic stretch member 28A assists the stretchability of the upper layer nonwoven fabric 21A and the lower layer nonwoven fabric 21B, and can exhibit a higher degree of fit. As shown in FIG. 8, similarly to the waist elastic elastic member group disposed on the front body exterior sheet 30, a net-like elastic elastic member 27A composed of warp yarns 27a and weft yarns 27b can be used.

  In addition, the expansion / contraction function of the above-mentioned diaper longitudinal direction can also be provided to both the exterior sheet 20 for the back body and the exterior sheet 30 for the front body, and as shown in FIG. In the example shown, it can be applied only to the rear body exterior sheet 20.

  As described above, the exterior sheets 20 and 30 imparted with stretchability in the longitudinal direction of the diaper are joined to the absorbent main body 10 in the stretched state in the diaper longitudinal direction and the crotch side direction with respect to the absorbent main body 10. Has been. Then, since the absorptive main body 10 which has the rigidity which resists shrinkage | contraction of a diaper longitudinal direction is arrange | positioned at the center part of the diaper width direction of the exterior sheets 20 and 30, it shrinks somewhat, but it is to some extent as both sides of a diaper width direction. There is no contraction, so the longitudinal dimension of the central part of the diaper width direction is longer than the longitudinal dimension of both side parts of the diaper width direction. For this reason, concave leg circumference lines 29 and 39 corresponding to the leg circumference openings of the paper diaper are formed on the crotch side edges of the exterior sheets 20 and 30 from the joint edge to the side parts of the absorbent main body 10. become. In addition, the dimension ratio of the maximum value of the diaper longitudinal direction dimension of the exterior sheets 20 and 30 is 1.2 to 1.6 in the exterior sheet 20 for the back body, and 1.1 to 1 in the exterior sheet for the front body. .4, and the dimensional ratio of the rear body exterior sheet 20 is preferably larger than the dimensional ratio of the front body exterior sheet 30. Such leg-around lines 29 and 39 are not formed by cutting the exterior sheet with a roll cutter or the like as in conventional paper diapers, so that the cutting process can be omitted and the nonwoven fabric constituting the exterior sheet is wasted. No waste is generated and manufacturing costs can be reduced.

  Further, since the exterior sheets 20 and 30 are not cut as in the prior art, the elastic elastic members 27, 28, etc. at the openings around the legs are not particularly cut, and the exterior sheets 20, 30 extend in the longitudinal direction of the diaper. Since the waist elastic elastic members 27... 28 arranged along the waist portions of the exterior sheets 20 and 30 are curved along the leg circumference lines 29 and 39 by being joined in the state, The fit around the legs is improved in each step, and the body fluid leakage prevention effect from the legs is improved.

  The effects as described above can only be extended in the longitudinal direction of the diaper on both the upper nonwoven fabric 21A, 31A and the lower nonwoven fabric 21B, 31B with respect to one or both of the rear body exterior sheet 20 and the front body exterior sheet 30. The outer sheets 20 and 30 do not have elasticity in the longitudinal direction of the diaper, and have only extensibility by using a simple material and further not arranging the warp threads 27a and 28a such as the net elastic elastic members 27A and 28A. It can obtain even if it comprises. Therefore, in the present invention, the central portion of the outer sheet 20 or 30 in the width direction of the diaper in which only extensibility is imparted in the longitudinal direction of the diaper is the longitudinal direction of the diaper and the crotch side direction with respect to the absorbent main body 10. The structure joined in the extended state is also included.

  On the other hand, the waist elastic members 26, 25,... Arranged at the waist of the rear body exterior sheet 20 and the front body exterior sheet 30 are disposed in the vertical direction in the vicinity of the waist opening edge. It is a plurality of thread rubber-like elastic members, and the disposable diaper 1 is attached to the body by applying an expansion / contraction force so as to tighten around the waist of the body. For the waist elastic elastic members 26, 25, etc., thread rubber is used in the illustrated example, but, for example, a tape-like elastic member or a net-like elastic member may be used.

  The waistline elastic member groups 28, 27,... Arranged in the waistline portions of the rear body exterior sheet 20 and the front body exterior sheet 30 are generally from the upper part to the lower part except for the waist part in the side part joining range. The elastic rubber members are elastic rubber elastic members arranged in the horizontal direction at intervals in the vertical direction. The elastic force in the horizontal direction is applied to the waist parts of the front body F and the back body B, respectively. Give a paper diaper to the body. The waist elastic member groups 28, 27, etc. may be thread-like elastic elastic members that apply a horizontal expansion / contraction force to the waist circumference portion, and the horizontal thread-like elastic portions (wefts 27b, 28b) as described above. Not only a net-like elastic elastic member having a thread-like elastic part (warp yarn 27a, 28a) in the vertical direction (diaper longitudinal direction) may be used. The boundary between the waist elastic members 26, 25, and the waist elastic members 28, 27, etc. is not necessarily clear. For example, even if the number of elastic members arranged in the horizontal direction with an interval in the vertical direction on the back body B cannot be specified, some on the upper side function as waist elastic members, and the remaining elasticity It is only necessary that the member functions as a waist elastic member.

  In addition, the said elastic elastic members 25 ... 28 ... use the thing with a high transparency so that the fragment | piece may not stand out in the state arrange | positioned between 21 A of upper layer nonwoven fabrics and 21 A of lower layer nonwoven fabrics, or when cut finely. preferable.

  When the fixing parts of the exterior sheets 20 and 30 to the absorbent main body 10 are fixed in a state in which elastic contractility is imparted in the diaper width direction and / or the diaper longitudinal direction, the absorbent main body 10 is elastically contracted. Shrink by sex. The degree of contraction of the absorbent main body 10 varies depending on the elastic contraction force and the rigidity of the absorbent main body 10, but if the absorbent main body 10 contracts, the absorbent body 13 inside thereof is also contracted and the absorbency decreases, which is not preferable. Therefore, as shown in FIG. 3, each of the exterior sheets 20 and 30 preferably has a region overlapping with the absorbent main body 10 or at least a part of the region (70% or more of the region overlapping with the absorbent main body 10). ) Is provided with a large number of cutting portions C, C, etc., so that the waist elastic elastic members 27, 28, ... are preferably finely cut.

  Here, the elastic elastic members 27 and 28 are “finely cut” means that the elastic elastic members are finely cut at predetermined intervals by discontinuous means described later, and the elastic force of the elastic elastic members does not function. It is to be. In order to achieve such a state, for example, the elastic elastic members are cut at intervals of 1 to 10 mm, preferably at intervals of 1 to 5 mm, according to a predetermined cut pattern described later. Since the elastic elastic members 27 and 28 fixed to the exterior sheets 20 and 30 in a state of being stretched with respect to the absorbent main body 10 lose their elastic contractibility by being cut finely in this way, the absorber 13 is contracted. It is never done.

  In order to cut and discontinuously cut the elastic elastic members 28, after producing a continuous sheet for an exterior sheet to be the exterior sheet for the back body, a convex portion is formed on the surface, and a plurality of cutters are arranged on the convex portion. The continuous sheet for exterior sheet is passed between the cutter roll and the opposing roll facing the cutter roll, and the elastic elastic member 28 of the exterior sheet continuous sheet is placed between the convex part of the cutter roll and the opposing roll. It is cut by at least one of pressurization and heating. The opposing roll is preferably separated from the cutter roll so that the cutter part is lowered by the rotation of both rolls and comes into contact with only the cutter part of the cutter roll. Such discontinuity means can be similarly applied to the elastic elastic members 27 arranged on the front body exterior sheet 30.

  In the cut portions C, C, it is sufficient that at least the elastic elastic members 27, 28, ... are cut, and further, any one or both of the upper layer nonwoven fabrics 21A, 31A and the lower layer nonwoven fabrics 21B, 31B are cut. It is preferable to be formed so that an opening described later can be easily formed. However, even if the nonwoven fabric is not cut, the strength of the fibers of the nonwoven fabric of the cut portions C, C... Is cut by at least one of pressurization and heating between the convex portion of the cutter roll and the opposing roll. Alternatively, if the bonding strength between the fibers is reduced, or if the nonwoven fabric of the cut portions C, C... Is thinned and the elongation and strength are reduced, the opening at the time of extension is easy.

  By providing the cut portions C, C..., It is possible to form a partially high strain region (a region with little or no stretch property) in the low strain stretchable sheet. That is, when the exterior sheets 20, 30 are stretched in the diaper longitudinal direction, the cut portions C, C... Open and become substantially distorted, so that the exterior sheets 20, 30 are elastically contractible in the diaper longitudinal direction. Decreases. Therefore, the absorber 13 is not shrunk.

  The cut portions C, C... Are preferably provided in a slanted line shape inclined with respect to the diaper longitudinal direction in a region overlapping the absorbent main body 10. When the cut part C is provided in a diagonal line, when the outer sheet 20, 30 is extended in the diaper longitudinal direction, the cut parts C, C... Do not open. This is because the exterior sheet cannot be distorted and, on the other hand, when it is formed in a linear shape orthogonal to the longitudinal direction of the diaper, it is difficult to cut the elastic elastic members 27, 28, etc. finely. In addition, by making the cut part C into a slanted line shape, there are advantages that the cut part does not flicker and chips do not occur. On the other hand, the cutting portion C may be a semicircular shape, a V shape, a curved shape such as an X shape, a shape of a broken line, or a combination thereof, or a circular shape, a square shape, or a triangular shape, A shape having a portion inclined with respect to the longitudinal direction of the diaper is preferable.

  Further, the arrangement pattern (cut pattern) of the cutting portions C, C... Will be described in detail with reference to FIGS. 10 and 11 show the arrangement pattern of the cut portions C, C... Before and after the widening step of the continuous sheet for exterior sheets in the manufacturing process of the paper diaper 1 described in detail later. The arrangement pattern of the cutting parts C, C... May be a pattern in which the same cutting parts C are repeated vertically and horizontally at equal intervals, but as shown in FIG. A pattern may be used, or as shown in FIG. 11, an arrangement pattern may be formed in which the arrangement of one vertical column in the longitudinal direction of the diaper is alternately changed symmetrically and sequentially formed.

  When the cut portion C is hatched, the length per hatched line is longer than the separation width in the longitudinal direction of the diaper of the waist elastic elastic members 27, 28, and shorter than twice the separation width. It is preferable. The inclination angle from the diaper longitudinal line is preferably 30 to 60 degrees, more preferably 40 to 50 degrees, and most preferably 45 degrees.

  The arrangement pattern of the cutting parts C, C,... Is made of a rubber thread to ensure that the waist elastic elastic members 27, 28,. As shown in FIG. 10, when the waist elastic elastic members 27..., 28..., The projected length in the diaper longitudinal direction formed by an array of one horizontal row in the diaper width direction is the same in the adjacent horizontal row. Are preferably arranged so as to have an overlap with the projected length of On the other hand, when the waist elastic elastic members 27, 28, etc. are net-shaped, as shown in FIG. 11, the projected length in the diaper longitudinal direction and the diaper width direction in the arrangement of adjacent horizontal rows and vertical columns are shown. Preferably, the projection lengths are arranged in an arrangement pattern so as to overlap each other. In any of the above cases, the cut portions C, C... Do not overlap each other.

  As described above, since the exterior sheets 20 and 30 are provided with a large number of cut portions C, C... In the region overlapping the absorbent main body 10, the exterior sheets 20 and 30 are absorbent in the stretched state in the longitudinal direction of the diaper. Even if it joins with the main body 10, the shrinkage | contraction to the diaper longitudinal direction of the absorptive main body 10 hardly arises. Further, since the elastic stretch members 27, 28, ... are finely cut by providing the cut portions C, C ..., the absorbent main body 10 hardly shrinks in the diaper width direction. For this reason, the fitting property to the body can be maintained along the longitudinal direction of the central portion of the absorbent main body 10, and body fluids and the like can be effectively absorbed.

  In addition, the elastic stretch members 27, 28, ... are finely cut by providing a large number of cutting parts C, C ... in the region overlapping the absorbent main body 10, while the exterior sheets 20 near both sides of the absorbent main body 10, 30 is not provided with the cutting portions C, C..., So that both side portions of the absorbent main body 10 are pressed against the wearer's body by the contraction force in the longitudinal direction and width direction of the outer sheets 20, 30. become. For this reason, leakage of body fluids and the like from both sides of the absorbent main body 10 can be reliably prevented.

  In addition, since both the side parts of the exterior sheets 20 and 30 are arranged with a large number of elastic elastic members 25 to 28 along the waist part and the waist part, the elastic properties are imparted in the longitudinal direction of the diaper. The body is fitted to the body by the stretching force acting in the vertical direction and the horizontal direction, and the sliding of the disposable diaper 1 can be surely prevented.

  By the way, as shown in FIG. 2, the elastic elastic members 28 of the waist portion 24 arranged at the joint portions 40, 40 with the front body exterior sheet 30 at both side portions 42, 42 of the rear body exterior sheet 20. ... is also preferably cut finely. Thereby, both side parts 42 and 42 become the smooth fixed area | region where the junction parts 40 and 40 do not peel or distort, and the external appearance of a product improves. The cutting range (K) of the both side portions 42 is 10 to 50 mm, preferably 15 to 30 mm.

(Structure of the crotch outer sheet 19)
As shown in FIG. 4, the crotch outer sheet 19 is a crotch part between the rear body outer sheet 20 and the front body outer sheet 30, and is arranged on the outer surface side of the absorbent main body 10. It is installed. Here, the crotch outer sheet 19 may be made of the same material as the lower layer nonwoven fabrics 21B and 31B of the rear body exterior sheet 20 and the front body exterior sheet 30. Then, the boundary between the crotch outer sheet 19, the rear body outer sheet 20, and the front body outer sheet 30 becomes inconspicuous. The crotch outer sheet 19 may be made of a material different from the lower layer nonwoven fabrics 21B and 31B of the rear body outer sheet 20 and the front body outer sheet 30. Since the crotch outer sheet 19 located in the crotch is often rubbed between the wearer's crotch, it is preferable to use a nonwoven fabric material that is superior in flexibility and wear resistance to the front and back body sheets. In order to improve the wear resistance of the crotch outer sheet 19, the crotch outer sheet 19 and the leak-proof sheet 12 are integrated by embossing from the outer surface side of the crotch outer sheet 19. It can be designed. The crotch outer sheet 19 may be provided over the entire length of the absorbent main body 10, but the crotch part is connected to the rear body outer sheet 20 and the front body outer sheet 30 that are spaced apart from each other. It is preferable to provide only. About 10-30 mm is suitable for the length in which the exterior sheets 20 and 30 and the exterior sheet 19 for crotch overlap in the longitudinal direction of the diaper for connection, and the connection part is bonded by an adhesive such as hot melt or heat sealed. It is preferable to fix by welding with ultrasonic seal or the like, or a combination thereof. Further, the crotch outer sheet 19 is a sheet that does not stretch in the longitudinal direction of the diaper and has a high tensile strength. Specifically, the stretch rate under a load of 10 N / 50 mm in the longitudinal direction of the diaper is 40% or less. It is preferable to use a sheet having a tensile strength in the direction of 15 N / 50 mm or more. If comprised in this way, when a wearer pulls up a diaper upwards at the time of diaper mounting | wearing, the crotch part side edge of the exterior sheet 20 for back body and the exterior sheet 30 for front bodies will become difficult to peel. Both sides of the crotch outer sheet 19 are separated from the absorbent main body 10 (the separation width may be about 10 to 20 mm), and at least at this part, the outer sheets 20 and 30 and the crotch outer sheet 19 are firmly connected. The effect is more remarkable when it is configured as described above.

  Further, the crotch outer sheet 19 is provided wider than the absorbent main body 10 (so that the dimension in the diaper width direction is longer), and both side parts of the crotch outer sheet 19 are located on the outer side of the absorbent main body 10 in the diaper width direction. When configured so as to extend in the opposite direction, the rear body exterior sheet 20 and the front body exterior sheet 30 connected via the crotch exterior sheet 19 are mutually connected at both sides of the absorbent main body 10. This is preferable because it fits while interlocking.

  On both side portions of the crotch outer sheet 19, elastic elastic members may be arranged and fixed under extension in the diaper longitudinal direction. If it does so, the fitting property to a body will improve along the longitudinal direction of the absorptive main body 10. FIG. In particular, when the rear body exterior sheet 20 and / or the front body exterior sheet 30 is configured to be stretchable in the longitudinal direction of the diaper, the effect is remarkable. In this case, if the elastic elastic member fixing portions on both sides of the crotch outer sheet 19 are separated from the absorbent main body 10 (absorber) 13, the contraction of the elastic elastic member does not work directly on the absorber 13, This is preferable because the absorbability of the absorber 13 is less likely to decrease. Further, when the crotch outer sheet 19 is provided wider than the absorbent main body 10, and both side portions of the crotch outer sheet 19 are disposed outward in the diaper width direction from both side edges of the absorbent main body 10, The exterior sheet 20 for the body, the exterior sheet 30 for the front body, and the exterior sheet 19 for the crotch part are expanded and contracted integrally, which is preferable because the fitting property is further improved. As the elastic elastic members on both sides of the crotch outer sheet 19, the same elastic elastic members 17 of the three-dimensional gather BS can be used. The number is suitably about 1 to 3 on one side, and is preferably disposed at least on the side edge of the crotch outer sheet 19. It is appropriate that the arrangement interval is about 3 to 8 mm and the tension (elongation rate) is about 150 to 250%.

(Assembling paper diapers)
As shown in FIG. 7, the absorbent main body 10, the rear body exterior sheet 20, and the front body exterior sheet 30 are formed on the upper surface side of the rear body exterior sheet 20 and the front body exterior sheet 30. 10 are bonded and integrated by an adhesive such as hot melt. And the absorptive main body 10 is folded in the front-back direction by the folding line S, and the joining parts 40, 40 of the front body F and the joining parts 40, 40 of the back body B are joined by heat welding or hot melt adhesive. By doing so, the pants-type paper diaper 1 shown in FIG. 1 is assembled.

[Method of manufacturing disposable diaper 1]
FIG. 12 is an assembly process diagram in the case of the transverse flow method in which the line direction is the diaper width direction. As shown in the figure, first, as the manufacturing process of the exterior sheet continuous sheet, the longitudinal dimension of the diaper in the stretch release state of the back body exterior sheet 20 and the stretch release state of the exterior body sheet 30 for the front body The two continuous nonwoven fabrics having a width dimension combined with the longitudinal dimension of the diaper are fed into a line, and the waist elastic stretchable member and the waist elastic stretchable member are stretched along the line direction between the continuous nonwoven fabrics. The continuous sheet W1 for exterior sheets is manufactured by interposing a number of corresponding elastic elastic members.

  Next, as a step of cutting the elastic elastic member, the elastic elastic member is finely cut by providing cutting portions C, C... For the front body F and the back body B of the continuous sheet W1 for the exterior sheet. To do.

  Then, after separating (slit) the continuous sheet W1 for exterior sheets along the line direction at a predetermined position in the width direction as a separation arrangement step, the separation sheets are arranged apart in the line width direction. Here, the separation distance of each of the continuous sheets for the exterior sheet is the disposition position of the unfolded state of the paper diaper 1 that is the product in a state where the continuous sheet for the exterior sheet is stretched in the line width direction in the next widening step. It arranges so that it may.

  And as a widening process, the continuous sheet | seat for exterior sheets arrange | positioned separately is each extended | stretched in the line width direction and the line center side direction. In order to extend the continuous sheet for exterior sheets in the line width direction, a known widening means can be used. For example, a first winding roll that wraps the inner part in the line width direction of each continuous sheet for the exterior sheet from the upper surface side and a second winding roll that wraps from the lower surface side are arranged slightly apart in the line flow direction, and these By disposing the outer side in the line width direction of the rotating shaft of the winding roll so as to be inclined toward the line flow direction, the continuous sheet for exterior sheets can be widened inward. In the illustrated example, each exterior sheet continuous sheet is stretched in the line width direction and in the line center side direction, but each exterior sheet continuous sheet is stretched in the line width direction and in the line outer direction. Alternatively, the continuous sheets for exterior sheets can be extended in the line width direction and in the line center side direction and the line outer side direction, respectively.

  Moreover, in the manufacturing process of the paper diaper 1 in which the crotch outer sheet 19 that connects the rear body outer sheet 20 and the front body outer sheet 30 that are arranged apart from each other is provided in the crotch part, in the previous stage of the widening process. The crotch outer sheet 19 is joined to a portion corresponding to the crotch portion of the disposable diaper 1 between the spaced apart continuous sheet for the outer sheet. Therefore, in this case, the continuous sheets for the exterior sheets are not stretched in the line width direction, but the continuous sheets for the exterior sheets connected via the crotch outer sheet 19 are integrally formed in the line width direction. Therefore, it becomes possible to extend in the outward direction of the line. In the case of manufacturing through such a process, among the continuous sheets for both exterior sheets, the width is expanded in the line width direction (extended in the diaper longitudinal direction) for the crotch portion in the line flow direction (diaper width direction). Since the range is centered on the exterior sheet, the concave leg-around lines 29 and 39 can be formed only by widening (without releasing the widening), respectively. In this case, the upper layer nonwoven fabrics 21A and 31A and the lower layer nonwoven fabrics 21B and 31B are made of a material that can only be stretched in the longitudinal direction of the diaper, and warp yarns 27a and 28a such as the net-like elastic stretch members 27A and 28A are not disposed. You may do it. Further, in this case, since it is not necessary to open the cutting portion C of the elastic elastic members 27 and 28, the shape of the cutting portion C may be a line along the diaper longitudinal direction, and the elastic elastic members 27 and 28 are cut finely. The predetermined range including the cut portion may not be shrunk by cutting at one place without adjusting, and the absorbent main body 10 may be shrunk in the diaper width direction. It is also possible not to cut 28. As the crotch outer sheet, it is appropriate to use a sheet made of a general nonwoven fabric that is not stretchable in the longitudinal direction of the diaper, or a sheet made of a nonwoven fabric that can only be stretched in the longitudinal direction of the diaper. In particular, a sheet that does not stretch in the longitudinal direction of the diaper and has a high tensile strength, specifically, an elongation rate under a load of 10 N / 50 mm in the longitudinal direction of the diaper is 40% or less, and a tensile strength in the longitudinal direction of the diaper is 15 N / It is preferable to use a sheet of 50 mm or more.

  Next, as the absorbent main body bonding step, each of the continuous sheets for the exterior sheet is expanded in the line width direction, and the absorbent sheet is absorbed by an adhesive such as hot melt on the spaced apart continuous sheet for the exterior sheet. The main body 10 is joined. Here, since the adhesive may be exposed on the surface of the paper diaper from the cut portions C, C... Formed in the continuous sheet for exterior sheets, it is preferable to use an adhesive that does not have adhesiveness after solidification. Such an adhesive is previously applied to the absorbent main body 10 and / or the continuous sheet for the exterior sheet. Moreover, you may apply | coat to each continuous sheet for exterior sheets before the cutting process of the said elastic elastic member. On the other hand, you may join the cover sheet which consists of a nonwoven fabric etc. of a dimension comparable as the planar shape of the said absorptive main body 10 to the continuous sheet for exterior sheets, and the outer surface side of the absorptive main body 10. FIG. This cover sheet may also serve as the crotch outer sheet, and the order in which the absorbent main body 10 and the cover sheet are joined to the outer sheet continuous sheet is arbitrary.

  Thereafter, as the extension release step, the extended state of the continuous sheet for the exterior sheet is released, and the exterior body sheet for the rear body 20 and the front body are used by a fusing means such as heat seal or ultrasonic seal or an adhesive means. After the side sealing process for forming the joint portions 40, 40 of the exterior sheet 30, the sheet is cut into individual product shapes and the paper diaper 1 is assembled as a cutting process.

  In addition, the order of each process can be arbitrarily changed in the range which can implement this invention. For example, the elastic expansion / contraction member cutting step may be provided after the separation arrangement step or the widening step. Further, instead of cutting (slit) the continuous sheet for exterior sheet W1 along the line direction to form a pair of continuous sheets for exterior sheet, a pair of continuous sheets for exterior sheet may be formed separately. However, the side seal process is preferably after the extension release process. If the side seal is performed before the extension is released, the joints 40 and 40 are cured, and the vicinity of the joints 40 and 40 of the exterior sheets 20 and 30 may not be sufficiently contracted in the diaper longitudinal direction when the extension is released.

  DESCRIPTION OF SYMBOLS 1 ... Disposable paper diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable surface sheet, 12 ... Leak-proof sheet, 13 ... Absorber, 14 ... Cover sheet, 15 ... Gathered nonwoven fabric, 16-18 ... String-like elastic elastic member, 20 ... exterior sheet for back body, 21A / 31A ... upper layer nonwoven fabric, 21B / 31B ... lower layer nonwoven fabric, 21/23 ... waist portion, 22/24 ... waistline portion, 25/26 ... waist elastic elastic member, 27/28 ... waist elastic elastic members, 29.39 ... leg circumference line, 30 ... front body exterior sheet, C ... cutting part, W1 ... exterior sheet continuous sheet

Claims (4)

An absorbent main body in which an absorbent body is interposed between a liquid-permeable top sheet and a back sheet, and integrally joined with the absorbent main body to constitute a front body and a back body, and a front body and a back body In each region, an outer sheet in which a large number of thread-like elastic elastic members are arranged and fixed in the diaper width direction at least along the waist part and the waistline part between the upper layer nonwoven fabric and the lower layer nonwoven fabric,
The exterior sheet is divided into an exterior sheet for a front body and an exterior sheet for a back body, and the exterior sheet of the front body and / or the back body is a diaper with respect to the absorbent main body at a central part in a diaper width direction. By joining in the longitudinal direction and in the crotch side direction in a stretched state, the longitudinal dimension in the central part of the diaper width direction is longer than the longitudinal dimension in both sides of the diaper width direction,
By using a material that is extensible in the diaper longitudinal direction as the upper layer nonwoven fabric and the lower layer nonwoven fabric of the exterior sheet, and using a material that can be stretched in the diaper longitudinal direction in at least one of the upper layer nonwoven fabric and the lower layer nonwoven fabric. A disposable paper diaper characterized by being provided with stretchability in the longitudinal direction of the diaper at least in a portion of the exterior sheet that does not overlap the absorbent main body. Wherein only the crotch portion of the backsheet side of the absorbent body, the exterior sheet crotch portion connecting said back body outer sheet and the front body exterior sheet is arranged, disposable diapers according to claim 1, wherein . The disposable paper diaper according to claim 2 , wherein the crotch outer sheet is provided such that a dimension in a diaper width direction is longer than that of the absorbent main body. The disposable paper diaper according to any one of claims 2 and 3 , wherein an elastic elastic member is disposed on both sides of the crotch outer sheet.

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