JP6051789B2 - Disposable diaper and method for manufacturing sheet member - Google Patents

Description

  The present invention relates to a disposable diaper that is mounted on a wearer's crotch and absorbs and holds a liquid such as urine, and a method for manufacturing a sheet member used in the disposable diaper and the like. If demonstrating it concretely, the disposable diaper of this invention is provided in the width direction both sides of an absorber, and is provided with a pair of right-and-left three-dimensional gathers standing toward a wearer's skin. This pair of three-dimensional gathers is configured by overlapping at least three sheets. Moreover, the manufacturing method of a sheet | seat member is related with the manufacturing method of the sheet | seat member used for the said three-dimensional gathers of the said disposable diaper, for example.

  Conventionally, disposable diapers are known as diapers for infants and the elderly, for example. A general disposable diaper includes an absorbent body, a top sheet that covers the surface of the absorbent body, a back sheet that covers the back surface of the absorbent body, and a pair of three-dimensional gathers formed on both sides in the width direction of the absorbent body. Further, as disposable diapers having such a configuration, for example, a pants-type diaper formed in a pants shape in advance, and a tape-type diaper in which a fastening tape is provided on a side flap that covers the waist of the wearer are known. ing. Further, for example, a urine pad including a top sheet, an absorber, and a three-dimensional gather is also known.

  Generally, disposable diapers are worn with the upper end edge of the three-dimensional gather and the surface of the top sheet applied to the wearer's crotch. The top sheet is formed of a liquid-permeable material, and urine excreted by the wearer is transmitted through the top sheet and absorbed by the absorber coated with the top sheet. Moreover, the back sheet which coat | covers the back surface of an absorber is formed with the liquid-impermeable material, and prevents that the urine absorbed by the absorber leaks outside the diaper. In addition, the pair of three-dimensional gathers fixed on the top sheet prevents urine that has not permeated through the top sheet and urine that cannot be absorbed by the absorber from leaking from the diaper.

  In addition, a general three-dimensional gather is formed of a hydrophobic sheet member. One end portion (lower end portion) of the three-dimensional gather sheet material is fixed on the surface of the top sheet, and the other end (upper end portion) An elastic stretch body is disposed. And if the elastic elastic body arrange | positioned at the sheet | seat for solid gathers shrink | contracts, a solid gather will stand up using the contraction force of an elastic stretch body.

  Here, conventionally, a technique for forming a three-dimensional gathered disposable diaper by stacking three sheets is known (Patent Document 1). In the disposable diaper described in Patent Document 1, each three-dimensional gather has a configuration in which a continuous sheet material is folded twice, and the sheet material is tripled at least on the outer side in the width direction from the fixed end of the top sheet and the three-dimensional gather. Like the disposable diaper of this patent document 1, there exists a merit that the problem that urine leaks from the open end between sheet | seat materials can be eliminated by making a three-dimensional gather into the triple structure comprised by the continuous sheet | seat material. . Furthermore, like the disposable diaper of patent document 1, the air permeability of a three-dimensional gather can be ensured by forming the sheet member which comprises a three-dimensional gather with a hydrophobic nonwoven fabric.

JP 2012-135389 A

  As described above, since the urine leakage can be effectively prevented by making the three-dimensional gather to have a triple structure, the technique of making the three-dimensional gather to have a triple structure is very useful. However, when forming a sheet member constituting a three-dimensional gather, for example, after three sheets are overlaid, for example, when passing between an embossing roll and an anvil roll and embossing these three sheets at the same time, At the time of joining, there is a possibility that twist or distortion may occur in any of the three sheets (particularly, an intermediate sheet sandwiched between the two sheets). Problems such as twisting or distortion of some of the sheets that make up a three-dimensional gather will prevent the three-dimensional gather from standing up cleanly, or the surface tension and softness of the three-dimensional gather will be impaired, reducing the feeling of use of the disposable diaper. was there.

  Therefore, at the present time, when joining the three sheets constituting the three-dimensional gather, there is a demand for a technique that can prevent the occurrence of twisting in each sheet and can further improve the feeling of use of the disposable diaper. .

Therefore, the inventors of the present invention have intensively studied the means for solving the problems of the conventional invention described above, and as a result, the first sheet portion, the second sheet portion, and the third sheet portion interposed between these two sheets. When configuring the three-dimensional gather, first, only the first sheet portion and the third sheet portion are joined, and then all of the first sheet portion, the second sheet portion, and the third sheet portion are joined, The knowledge that the twist which generate | occur | produces at the time of joining of a sheet | seat was prevented was acquired. Thus, if the twist generated when the sheets are joined can be suppressed, the appropriate tension and softness of the surface of the three-dimensional gather can be maintained, and the usability of the entire disposable diaper is improved. The inventor has conceived that the problems of the prior art can be solved based on the above knowledge, and has completed the present invention.
More specifically, the present invention has the following configuration.

The 1st side of the present invention is related with a disposable diaper.
The disposable diaper of the present invention includes a liquid-permeable top sheet 1, a liquid-impermeable back sheet 2, an absorbent body 3 interposed between the top sheet 1 and the back sheet 2, and a width direction of the absorbent body 3. It has a pair of solid gathers 4 formed along the length direction of the absorber 3 on the left and right ends.
Here, the three-dimensional gather 4 includes a first sheet portion 41, a second sheet portion 42, and a third sheet portion 43 disposed between the first sheet portion 41 and the second sheet portion 42. Is done.
The three-dimensional gather 4 is provided with a plurality of temporary fixing portions A that join the first sheet portion 41 and the third sheet portion 43 in one or a plurality of rows along the length direction.
Further, a plurality of main fastening portions B that join the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 are provided in one or a plurality of rows along the length direction.

  As in the above configuration, in the disposable diaper of the present invention, the three-dimensional gather 4 includes the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43, and is an intermediate portion of the three sheets. The third sheet portion 43 located at the position is joined only to the first sheet portion 41 by the temporary fixing portion A. In addition, the third sheet portion 43 is joined to the first sheet portion 41 and the third sheet portion 43 by the fixed stop B. As described above, the temporary fixing portion A that joins two sheets and the main fastening portion B that joins all three sheets are separately formed, so that twists and distortions that occur at the time of joining each sheet are formed. Can be prevented. That is, if it is attempted to join all three sheets at once, the sheet located in the intermediate portion is likely to be twisted. However, before joining the three sheets as in the present invention, the two sheets are joined. By overlapping and temporarily joining, the twist produced when joining three sheets can be eliminated.

  In the disposable diaper of the present invention, it is preferable that the rows of the temporary fixing portions A and the rows of the main fastening portions B are provided at intervals in the width direction of the absorbent body.

  As in the above configuration, the row of temporary fixing portions A that join the first sheet portion 41 and the third sheet portion 43, and the book that joins the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43. Since the rows of the stop portions B are arranged so as to be shifted in the width direction of the absorber, each sheet can be joined as a whole. Furthermore, if the row of the temporary fixing portions A and the row of the main fastening portions B coincide with each other, the overlapped portion becomes hard and causes a decrease in the texture of the sheet. Such problems can be prevented by shifting the rows.

In the disposable diaper of the present invention, in the pair of three-dimensional gathers 4, one or a plurality of three-dimensional gather expansion / contraction members 44 are arranged along the length direction of the absorber at the front end portion in the width direction. The three-dimensional gather expansion / contraction member 44 is joined to at least one of the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 in an extended state, and gathers (襞) is generated.
In this case, in the disposable diaper of the present invention, in the overlapping region 45 where the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 overlap, the row of the temporary fixing portions A and the main locking portions B is It is preferable that at least two rows are provided.
Further, of the row of the temporary fixing portion A and the row of the main fastening portion B, the row formed at a position close to the three-dimensional gather expansion / contraction member 44 is the row of the temporary fixing portion A, and the width direction outer side of the overlapping region 45. It is preferable that the row | line | column currently formed in the position close | similar to the front-end edge of this is the row | line | column of this stop B.

  As in the above-described configuration, first, a row of temporary fixing portions A for joining the first sheet portion 41 and the third sheet portion 43 is formed in the vicinity of the three-dimensional gather expansion / contraction member 44, so that the middle of the three sheets is formed. It is possible to prevent the third sheet portion 43 located in the middle of the twist. Furthermore, the row of the fixed portions B that join the first sheet portion, the second sheet portion 42, and the third sheet portion 43 is located in the vicinity of the front end edge (the base end of the three-dimensional gather 4) of the overlapping region 45 in the width direction. By forming, the joining of the three sheets becomes strong, and an appropriate tension is created in the three-dimensional gather 4, and the appearance is improved. Therefore, it is preferable that the row of the temporary fixing portions A and the row of the main fastening portions B are formed at the above-mentioned appropriate positions.

  In the disposable diaper according to the present invention, at least two rows of the permanent stoppers B are positioned between the rows of the temporary fixing portions A provided in at least two rows in the overlapping region 45, and at least two rows. It is preferable that at least one row of temporary fixing portions A is located between the provided rows of permanent fixing portions B.

  As in the above-described configuration, at least one row of the main fastening portions B is arranged between the rows of the two temporary fastening portions A, and at least one row is arranged between the two rows of the permanent fastening portions B. A row of temporary fixing portions A is arranged. In this way, by forming the rows of temporary fixing portions A and the rows of permanent fixing portions B alternately, for example, first the first sheet portion 41 and the third sheet portion 43 are first joined by the temporary fixing portion A, After that, when the three sheets 41 to 43 are joined simultaneously by the main stop B, the main stop B only needs to be formed between the two temporary stops A, so the main stop B is formed. This makes it easier to perform the process, and prevents the sheet from being twisted when the final stop B is formed.

In the disposable diaper of the present invention, the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 are preferably made of a nonwoven fabric having a basis weight of 8 g / m ² or more and 25 g / m ² or less. .

  In the present invention, since the three-dimensional gather 4 is composed of three sheets, it is preferable that each sheet is composed of a nonwoven fabric having a relatively low basis weight as in the above-described configuration. Thus, by adopting a nonwoven fabric having a relatively low basis weight, it is possible to prevent a decrease in air permeability even when three sheets are stacked.

The second aspect of the present invention relates to a method for manufacturing a sheet member.
The manufacturing method of the present invention relates to a method for manufacturing a sheet member including a first sheet portion 41, a second sheet portion 42, and a third sheet portion 43 disposed between the first sheet portion 41 and the second sheet portion 42. . For example, the manufacturing method which concerns on a 2nd side surface is used as a sheet | seat member for the three-dimensional gathers of the disposable diaper which concerns on the 1st side surface mentioned above.
In the manufacturing method of the present invention, the step of joining the first sheet portion 41 and the third sheet portion 43 by the plurality of temporary fixing portions A provided in one or a plurality of rows along the first direction is performed. In the manufacturing method of the present invention, the first sheet portion 41, the second sheet portion 42, and the third sheet are provided by a plurality of main stop portions B provided in one or a plurality of rows along the first direction. And a step of bonding the portion 43. In this manufacturing method, the row of the temporary fixing portions A and the row of the main fastening portions B are provided with an interval in a second direction orthogonal to the first direction. In the present invention, first, the step of joining the first sheet portion 41 and the third sheet portion 43 is performed, and then the step of joining the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43. It is preferable to carry out.

  After the first sheet portion 41 and the third sheet portion 43 are joined by the temporary fastening portion A as in the manufacturing method including the above-described steps, the first sheet portion 41, the second sheet portion 42, and the second sheet portion are joined by the final fastening portion B. By joining the 3 sheet | seat part 43, when joining by this fixed part B, it can prevent that a twist arises in each sheet | seat. Therefore, according to the manufacturing method of the present invention, it is possible to manufacture a sheet member that has a suitable tension and softness on the surface and is easy to touch. For example, the sheet | seat member manufactured according to the manufacturing method of this invention can be used suitably as a sheet | seat member which comprises the solid gathers of a disposable diaper.

  In the present invention, the three-dimensional gather (sheet member) includes the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43, and is located at the middle portion of the three sheets. 43 is joined only to the first sheet portion 41 by the temporary fixing portion A. In addition, the third sheet portion 43 is joined to the first sheet portion 41 and the third sheet portion 43 by the fixed stop B. In this way, the temporary stop A that joins two sheets and the main stop B that joins all three sheets are separately formed to prevent twisting that occurs when the sheets are joined. it can. In other words, if it is attempted to join all three sheets at once, it is easy for the sheet located in the middle portion to be twisted, but before joining the three sheets, the two sheets are overlapped and temporarily joined. Therefore, the twist that occurs when the three sheets are joined can be eliminated. Thereby, this invention can provide the solid gathers (sheet | seat member) with a suitable touch which has moderate tension | tensile_strength and softness on the surface.

FIG. 1 is a developed view showing an embodiment of a disposable diaper according to the present invention. FIG. 2 is a sectional view taken along line XX shown in FIG. FIG. 3 shows an example of a pattern for joining sheet members forming a three-dimensional gather. 3A is a cross-sectional view of the three-dimensional gather in the width direction, FIG. 3B is a plan view of the three-dimensional gather, and FIG. 3C is a dotted line shown in FIG. It is an enlarged view in the frame. FIG. 4 shows another example of a pattern for joining sheet members forming a three-dimensional gather. 4A is a cross-sectional view in the width direction of the three-dimensional gather, FIG. 4B is a plan view of the three-dimensional gather, and FIG. 4C is a dotted line shown in FIG. It is an enlarged view in the frame. FIG. 5 is a cross-sectional view showing another embodiment of the disposable diaper according to the present invention. FIG. 6 is a cross-sectional view showing still another embodiment of the disposable diaper according to the present invention. FIG. 7 is a flowchart conceptually showing a method for manufacturing a sheet member according to the present invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but includes those appropriately modified by those skilled in the art from the following embodiments.
In this specification, “A to B” means “A to B”.
In addition, in the present specification, the term “length direction” refers to the length direction of the absorbent body that is formed vertically, and the direction that connects the front body and the back body of the disposable diaper (the vertical direction in FIG. 1). means. In addition, the “width direction” means a width direction of the vertically formed absorber, and means a direction (left-right direction in FIG. 1) perpendicular to the length direction in a plane. Further, the “thickness direction” means a direction in which the sheet members constituting the disposable diaper overlap, and means a direction (vertical direction in FIG. 2) that is three-dimensionally orthogonal to the length direction and the width direction.

(1. Overall configuration of disposable diapers)
The present invention basically includes a top sheet 1, a back sheet 2, an absorber 3 interposed between these sheets, and a pair of left and right sides disposed on both sides in the width direction of the absorber 3 and extending along the length direction. The three-dimensional gather 4 can be applied to a disposable diaper 100. The top sheet 1 is liquid permeable and the back sheet 2 is liquid impermeable. The liquid such as urine excreted by the wearer passes through the top sheet 1 and is absorbed and held by the absorber 3, and the back sheet 2 prevents leakage to the outside. The pair of left and right three-dimensional gathers 4 have both ends in the length direction fixed to the surface of the top sheet 1 and have free ends that are not fixed to the top sheet 1 at the center in the length direction. One or a plurality of elastic elastic members are fixed to the free end of the three-dimensional gather 4 along the length direction. For this reason, when the elastic elastic member contracts, the free end of the three-dimensional gather 4 stands up in the direction in contact with the wearer's skin. By raising the three-dimensional gather 4, the adhesiveness between the disposable diaper 100 and the wearer can be improved, and side leakage such as urine that cannot be absorbed by the absorbent body 3 can be prevented. Thus, the three-dimensional gather 4 also functions as a leak-proof wall for preventing urine leakage. The present invention can be applied to a known type of disposable diaper 100, for example, a pants-type diaper or a tape-type diaper.

  FIG. 1 is a development view showing an embodiment of a disposable diaper 100, and shows a state in which the disposable diaper 100 is viewed from the top sheet 1 side. In FIG. 1, various sheet materials constituting the disposable diaper are transparently drawn in order to show the positional relationship between the elastic members arranged at various places. FIG. 1 shows an embodiment of a disposable diaper 100 in the case of a pants type.

  As shown in FIG. 1, the disposable diaper 100 according to this embodiment includes an absorbent main body 7, a front body exterior body 8, and a back body exterior body 9. The front body exterior body 8 constitutes the front body of the disposable diaper, and contacts the wearer's abdomen when worn. Moreover, the back body exterior body 2 comprises the back body of a disposable diaper, and contacts a wearer's back part at the time of mounting | wearing. The absorptive main body 7 includes the top sheet 1, the back sheet 2, the absorber 3, and a pair of left and right three-dimensional gathers 4 described above. The absorbent main body 7 has one end side in the length direction fixed to the front body exterior body 8, the other end side fixed to the rear body exterior body 9, and the crotch portion located between the front body and the back body, It has the area | region which is not fixed to any exterior body. For this reason, in this embodiment, the absorptive main body 7 is in a state of being bridged between the front body exterior body 8 and the back body exterior body 9. As a means for fixing the absorbent main body 7 to the front body exterior body 8 and the back body exterior body 9, a known method can be used, for example, fixing using a hot melt adhesive or other fluid adhesive. It may be fixed to the method, or may be fixed by heat welding such as heat sealing or ultrasonic welding.

  Further, the front body exterior body 8 and the back body exterior body 9 are joined to each other at the side seal portions 81 and 91 located at both side edges in the width direction. Thereby, the front body exterior body 8 and the back body exterior body 9 are connected in a ring shape and can cover the wearer's torso. The front body exterior body 8 and the back body exterior body 9 are joined at the side seal portion, so that a waist opening located around the waist of the wearer at the time of wearing and a leg located around the leg of the wearer at the time of wearing. An opening around the part is formed. In this way, a pants-type disposable diaper 100 is formed. The wearer puts both legs into the waist opening so that the abdomen is in contact with the front body exterior body 8 and the back is in contact with the back body exterior body 9, and each leg is opened around the leg. The disposable diaper 100 can be mounted so that the absorbent main body 7 is applied to the crotch portion.

  In addition, although illustration is abbreviate | omitted, this invention is applicable also to a tape-type disposable diaper. The structure of a tape-type disposable diaper is known. The tape-type disposable diaper has a structure in which an adhesive tape is attached so as to extend from both sides of the front body or the back body, and the front body and the back body are bonded using the adhesive tape when worn.

(2. Components of disposable diapers)
Hereinafter, the structure of each part of the disposable diaper 100 of this invention is demonstrated concretely using drawing.

(2-1. Absorbent body)
The absorbent main body 7 is a member that is positioned in the crotch of the wearer when the disposable diaper 100 is worn and absorbs and holds liquid such as urine excreted by the wearer. As shown in FIG. 1, the absorbent main body 7 has a pair of short sides at both ends in the length direction joined to the front body exterior body 8 and the back body exterior body 9, and a pair of sides at the width direction as a pair. It is formed in a vertically long, substantially rectangular shape having a long side.
In the present embodiment, the absorbent main body 7 includes a top sheet 1, a back sheet 2, an absorber 3, a pair of three-dimensional gathers 4, a pair of leg-around gathers 5, and a cover sheet 6.
FIG. 2 shows an outline of a cross-sectional view of the disposable diaper 100 taken along the line XX shown in FIG. In FIG. 2, the various sheet members constituting the absorbent main body 7 are drawn with a conceptual thickness for easy understanding, but originally, the various sheet members are extremely thin. It is a material and does not have a thickness as shown in FIG. Hereinafter, with reference to drawings, the structure of each part of the absorptive main body 7 is demonstrated.

(2-2. Top sheet)
The top sheet 1 is a sheet-like member that is in direct contact with the skin of the wearer's crotch and allows liquid such as urine to pass through the absorber 3. For this reason, the top sheet 1 is composed of a liquid-permeable material having high flexibility. The top sheet 1 is disposed so as to cover the absorber 3 from the skin contact surface side. The top sheet 1 and the absorbent body 3 may be fixed by a known adhesive such as a hot melt adhesive.

  The liquid permeable material constituting the top sheet 1 includes a predetermined amount (for example, 10 ml) of water within a predetermined time (for example, 1 minute) under conditions such as normal temperature, humidity, and atmospheric pressure in which disposable diapers are used. What shows the performance which permeate | transmits should just be used. Examples of liquid permeable materials are woven fabrics, non-woven fabrics, or porous films. Moreover, as the top sheet 1, it is good also as using the thing which hydrophilized the fiber of thermoplastic resins like a polypropylene, polyethylene, polyester, or nylon, and made it the nonwoven fabric. Moreover, as a nonwoven fabric which comprises the top sheet 1, what processed natural fibers, such as cotton, by processing methods, such as a spun bond method, a spun lace method, a thermal bond method, a melt blown method, or a needle punch method, is mentioned. Among nonwoven fabric processing methods, nonwoven fabrics formed by the spunbond method are excellent in flexibility and drape. In addition, the thermal bond method has an advantage that a bulky and soft nonwoven fabric can be obtained.

(2-3. Backsheet)
The back sheet 2 is a sheet-like member for preventing the liquid that has passed through the top sheet 1 and absorbed by the absorber 3 from leaking outside. For this reason, the backsheet 2 is made of a liquid-impermeable material. The back sheet 2 is disposed so as to cover the absorbent body 3 from the non-skin contact surface side. The back sheet 2 and the absorbent body 3 may be fixed by a known adhesive such as a hot melt adhesive.

  The liquid-impermeable material constituting the backsheet 2 is a predetermined amount (for example, 10 ml) within a predetermined time (for example, 1 minute) under conditions such as normal temperature, humidity, and atmospheric pressure in which disposable diapers are used. What shows the performance which water does not permeate may be used. An example of the liquid impervious material constituting the back sheet 2 is an olefin resin sheet such as polyethylene or polypropylene, and at least a sheet material having liquid shielding properties is used. Further, as the back sheet 2, a microporous air-permeable resin sheet obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, molding the sheet, and then stretching the sheet may be used. it can. In addition, as the back sheet 2, a laminated nonwoven fabric sheet in which a nonwoven fabric is laminated on a polyethylene sheet or the like, or a nonwoven fabric sheet having substantial liquid impermeability through a waterproof film can be used. In particular, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed as the backsheet 2.

(2-4. Absorber)
The absorber 3 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 3 is disposed between the liquid-permeable top sheet 1 and the liquid-impermeable back sheet 2. The absorber 3 has a function of absorbing the liquid that has passed through the top sheet 1 and is made of an absorbent material. A known material can be adopted as the absorbent material constituting the absorber 3. As an absorptive material, for example, fluff pulp, a superabsorbent polymer, or a hydrophilic sheet may be used. In addition, as the absorbent material, one type of fluff pulp, superabsorbent polymer, or hydrophilic sheet may be used alone, or two or more types may be used in combination. The absorbent material is usually formed and used in a single-layer or multi-layer mat shape. Further, the absorber 3 is enclosed in a region between the top sheet 2 and the back sheet 2. The top sheet 1 and the back sheet 2 are preferably joined to each other so as to surround the periphery of the absorber 31. That is, the top sheet 1 and the back sheet 2 are joined to each other so as to enclose the absorber 3 along the edges in the width direction and the length direction of the absorber 3.

  The shape of the absorber 3 can be appropriately designed according to the shape, size, and use of the disposable diaper. For example, the shape of the absorber 3 is preferably an hourglass shape as shown in FIG. The hourglass shape means that, on the front body side and the back body side, both side edges of the absorber 3 have extending portions that extend outward in the width direction. In the hourglass type, by forming extended portions at the four corners of the absorber 3, a constricted portion that is curved or refracted toward the inside of the absorber 3 is formed at the center in the longitudinal direction of the absorber 3. . Moreover, the absorber 3 is good also as a rectangular shape, an elliptical shape, or a gourd shape currently used for the general disposable diaper.

(2-5. Solid gathers)
The three-dimensional gather 4 is a member that stands along both side edges of the absorber 3 and prevents side leakage of urine excreted by the wearer. A pair of the three-dimensional gathers 4 may be formed along both side edges of the absorber 3, or two or more pairs may be formed. The three-dimensional gather 4 serves as a urine leakage-preventing wall in an upright state (a state in which the elastic elastic member contracts), so that urine that has not permeated through the top sheet 1 or urine that cannot be absorbed by the absorber 3 It is possible to prevent a situation where the disposable diaper leaks from the opening around the leg.

  In the present embodiment, each of the three-dimensional gathers 4 is formed by a single continuous side sheet 4a. The side sheet 4 a constituting the three-dimensional gather 4 has a fixed end on the top sheet 1. As shown in FIGS. 1 and 2, the side sheet 4a is fixed on the top sheet 1 along the length direction of the disposable diaper. The side sheet 4 a is fixed to the top surface of the top sheet 1 and the bottom surface of the back sheet 2 so as to sandwich both side edges of the top sheet 1 and the back sheet 2. In the present embodiment, the side sheets 4 a that form the three-dimensional gathers 4 are configured separately from the top sheet 1 and the back sheet 2. However, each three-dimensional gather 4 may be configured by bonding a plurality of separately formed sheet members.

  In each three-dimensional gather 4, one or a plurality of three-dimensional gather expansion / contraction members 44 are arranged along the length direction of the diaper on each side sheet 4a, and the contraction force of the three-dimensional gather expansion / contraction member 44 is used. And stand up. That is, the side seat 4a includes a fixed end portion in which the front and rear body end portions are fixed on the top sheet 1, and a free end portion positioned between the front body side and the rear body side fixed portion. One or a plurality of three-dimensional gather expansion / contraction members 44 are arranged around the free end portion, and when the three-dimensional gather expansion / contraction member 44 contracts, the free end portion rises. As shown in FIG. 2, the three-dimensional gather expansion / contraction member 44 is disposed in the vicinity of the upper end edge of the three-dimensional gather 4. Further, the plurality of three-dimensional gather elastic members 44 are arranged at intervals in the width direction while extending in the length direction.

  In addition, in FIG. 2, the example in case the solid gather 4 inclines toward the inner side of a diaper is shown. However, the form of the three-dimensional gather 4 is not limited to the one that tilts toward the inside of the diaper. For example, the three-dimensional gather 4 may be configured to incline toward the outside of the diaper, or may have a curved portion or a broken line formed on a part of the wall surface on which the three-dimensional gather 4 stands.

  In the present invention, the standing portion of each three-dimensional gather 4 has a region where the sheet overlaps at least three layers (overlapping region 45). In the present embodiment, as shown in FIG. 2, the upright portion of the side sheet 4 a constituting the three-dimensional gather 4 is folded at least at the first folding part 46 and the second folding part 47, and the sheet is tripled. It has the composition which becomes. That is, the standing portion of the three-dimensional gather 4 is at least between the first sheet portion 41, the second sheet portion 42, the first sheet portion 41, and the second sheet portion 42 in the overlapping region 45 where the sheets overlap three layers. And a third sheet portion 43 disposed on the surface.

  As shown in FIG. 2, in the present embodiment, in the side seat 4 a, the region from the leading edge on the side constituting the standing portion to the first folded portion 46 becomes the third seat portion 43, and the first seat A region between the folded portion 46 and the second folded portion 47 becomes the first sheet portion 41, and a region from the second folded portion 47 to the leading edge on the side fixed to the back sheet 2 (or the top sheet 1). Becomes the second sheet portion 42. That is, one side sheet 4a that constitutes the three-dimensional gather 4 has, in the width direction, the third sheet portion 43, the first sheet portion 41, and the second sheet portion 42 from the leading edge side that constitutes the standing portion. They are connected in order.

  In this embodiment, the 1st folding | turning part 46 formed between the 1st sheet | seat part 41 and the 3rd sheet | seat part 43 is the 3rd sheet | seat part 43, and the 1st sheet | seat part 41 and the 1st It becomes a fold line for folding back between the two sheet portions 42. Moreover, the 2nd folding | returning part 47 formed between the 1st sheet | seat part 41 and the 2nd sheet | seat part 42 turns into a fold line for folding the 1st sheet | seat part 41 toward the downward direction from upper direction. As shown in FIG. 2, in the present embodiment, the first sheet portion 41 is located on the innermost side in the width direction, the second sheet portion 42 is located on the outermost side in the width direction, and the third sheet portion 43 is Located in the middle of both sheet parts.

  As shown in FIG. 2, the standing portion of the three-dimensional gather 4 preferably includes a region where only the first sheet portion 41 and the second sheet portion 42 overlap. That is, a region where only the first sheet portion 41 and the second sheet portion 42 overlap is formed in the vicinity of the leading edge of the standing portion of the three-dimensional gather 4 without the third sheet portion 43 interposed therebetween. In this case, at least one of the plurality of three-dimensional gather expansion / contraction members 44 is sandwiched between the first sheet portion 41 and the second sheet portion 42 so that the upper end edge of the three-dimensional gather 4 or its It is preferable to be fixed in the vicinity. In FIG. 2, three three-dimensional gather expansion / contraction members 44 are arranged in the standing part of the three-dimensional gather 4 with an interval in the width direction of the three-dimensional gather 4, and two of these three-dimensional gather expansion / contraction near the upper edge. A member 44 is sandwiched between the first sheet portion 41 and the second sheet portion 42. However, the number of the three-dimensional gather expansion / contraction members 44 disposed in the vicinity of the upper end edge of the three-dimensional gather 4 can be changed as appropriate, and may be one or two, for example, or four or more. Good.

  In addition, as shown in FIG. 2, it is preferable that at least one three-dimensional gather expansion / contraction member 44 is also disposed in the overlapping region 45 where the three sheets 41 to 43 overlap in the standing portion of the three-dimensional gather 4. In this case, at least one of the plurality of three-dimensional gather elastic members 44 is sandwiched between the first sheet portion 41 and the third sheet portion 43 or between the second sheet portion 42 and the third sheet portion 43. It is preferable that they are fixed. In the embodiment shown in FIG. 2, among the plurality of three-dimensional gather expansion / contraction members 4 arranged at the standing portion of the three-dimensional gather 4, the three-dimensional gather expansion / contraction member 44 disposed on the base end side of the three-dimensional gather 4 is the first. It is arranged between the second sheet part 42 and the third sheet part 43. In this way, by fixing at least one three-dimensional gather elastic member 44 between the third sheet portion 43 and the first sheet portion 41 or between the third sheet portion 43 and the second sheet portion 42, Since the third sheet portion 43 is joined to the first sheet portion 41 or the second sheet portion 42 by the adhesive applied to the gather expansion / contraction member 44, the third sheet portion 43 can be prevented from twisting.

Further, as shown in FIG. 2, each of the side sheets 4 a may form a leg-around gather 5 separately from the three-dimensional gather 4. That is, as shown in FIG. 2, the side sheet 4 a partially fixed to the back surface (non-skin contact surface) of the back sheet 2 along the length direction of the absorber 3 is replaced with the top sheet 1 and the back sheet. The third folded portion 52 is formed by folding back toward the inside of the absorbent main body 7 on the outer side in the width direction than the joining position of 2. And the 3rd folding | turning part 52 of the side seat | sheet 4a is arrange | positioned in the expansion | extension state along the length direction of a disposable diaper, and the some leg | limb gather gather expansion-contraction member 51 is arrange | positioned at intervals in the width direction. As a result, the side seat 4 a stands up at the third folded portion 52 using the contraction force of the leg-around gather expansion / contraction member 51 to form the leg-around gather 5.
Further, a part of the side sheet 4a folded back at the third folding section 52 is fixed on the surface (skin contact surface) of the top sheet 1 so as to sandwich the top sheet 1 and the back sheet 2. Further, the side sheet 4 a extends inward in the width direction from the fixed line with the top sheet 1, and the extending part constitutes an upright part of the three-dimensional gather 4. The side sheet 4 a is folded back inward in the width direction of the absorbent body 3 at the standing portion to form a second folded portion 47. The sheet portion folded back by the second folding portion 47 is further folded by the first folding portion 46 between the sheet members constituting the standing portion upward. Thereby, the overlapping region 45 where the sheet member is tripled is formed in the standing portion. In the overlapping region 45, the first sheet portion 41 positioned on the inner side in the width direction, the second sheet portion 42 positioned on the outer side in the width direction, and the third sheet positioned between the first sheet portion 41 and the second sheet portion 42. A sheet portion 43 is formed. And in the standing part of the side seat | sheet 4a, the several three-dimensional gather expansion-contraction member 44 is arrange | positioned at intervals in the width direction in the expansion | extension state along the length direction of a disposable diaper. As a result, the side sheet 4 a stands up using the contraction force of the three-dimensional gather elastic member 44 to form the three-dimensional gather 4.

  As the side sheet 4a, it is preferable to use a material having water repellency. As an example of the water-repellent material, it is preferable to use a nonwoven fabric such as spunbond or card emboss from the viewpoint of high water repellency and good air permeability. In particular, it is preferable to use a nonwoven fabric such as SMS (spunbond / meltblown / spunbond) or SMMS (spunbond / meltblown / meltblown / spunbond) because of its high water pressure resistance.

If the side sheet 4a is formed by a nonwoven fabric, the basis weight ^is preferably ^{8g / m 2 ~25g / m 2} , or ^{10g / m 2 ~20g / m 2} . In the present invention, in order to form the three-dimensional gather 4, the side sheets 4a are configured to be stacked three times. However, by adopting a relatively low basis weight non-woven fabric, the sheets are stacked in three layers. Even so, it is possible to prevent the air permeability of the three-dimensional gather 4 from being lowered.

  Further, a known thread-like or belt-like elastic elastic member can be used for the above-described three-dimensional gather elastic member 44 and the leg-around gather elastic member 51. For example, it is preferable to apply thread-like elastic rubber to these elastic members. As such a rubber material, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, or polyester can be used. The material of the elastic member is not necessarily limited to these materials, and various known materials having elasticity such as a thermoplastic elastomer, a plastic sheet, or a rubber sheet can be used.

(2-5-1. Joining pattern of solid gathers: first example)
In the present invention, in the three-dimensional gather 4 having the above structure, the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 are joined in a predetermined pattern. In particular, the three-dimensional gather 4 has joint portions of various sheet portions in the overlapping region 45 where the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 overlap. Hereinafter, an example of a joining pattern of a three-dimensional gather will be described.

FIG. 3 shows an example of a pattern for joining the side sheets 4 a constituting the three-dimensional gather 4. FIG. 3A and FIG. 3B show a cross-sectional view (a) of the side seat 4a and a plan view (b) of the side seat 4a side by side in association with each other. FIG. 3C is an enlarged view showing the inside of the broken line frame shown in FIG.
In FIG. 3, “white circle” indicates the temporary fixing portion A that joins the first sheet portion 41 and the third sheet portion 43, and the first discarding portion A ′ that is formed together with the temporary fixing portion A. . In addition, the “black circle” is a second stop portion formed together with the main stop portion B joining the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43, and the main stop portion B. B 'is meant.

  As shown in FIG. 3, a temporary fixing for joining the first sheet portion 41 and the third sheet portion 43 to the overlapping region 45 where the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 overlap. A plurality of portions A are formed. In the present embodiment, each of the temporary fixing portions A is formed in a dot shape. In the present specification, each point where the first sheet portion 41 and the third sheet portion 43 are joined is referred to as a temporary fixing portion A. The plurality of temporary fixing portions A are formed in a plurality of rows along the length direction of the diaper (vertical direction in FIG. 3). That is, the plurality of temporary fixing portions A are linearly arranged along the length direction of the diaper, and a straight line formed by the plurality of temporary fixing portions A is referred to as a “row”. In a certain row, the plurality of temporary fixing portions A are formed at regular intervals in the length direction. The interval between the plurality of temporary fixing portions A existing in a certain row may be set to, for example, 2 mm to 12 mm, 4 mm to 10 mm, or 6 mm to 8 mm. And the row | line | column which this some temporary fix part A makes is formed in multiple numbers at intervals in the width direction (left-right direction of FIG. 3) of a diaper. In the pattern shown in FIG. 3, as shown in FIG. 3C, the columns of the temporary fixing portions A are formed in two rows of the columns A <b> 1 and A <b> 2 in order from the inner side in the width direction in the overlapping region 45. ing.

  A method for forming the plurality of temporary fixing portions A is, for example, in a state in which the first sheet portion 41 and the third sheet portion 43 are stacked in the thickness direction, and press-passed between the embossing roll and the anvil roll to form both sheets. What is necessary is just to give the embossing which joins a part. For embossing, a known method can be adopted. For example, in the embossing process, a first sheet portion 41 and a second sheet portion 42 are provided between a heated metal embossing roll having a plurality of minute convex portions on the outer peripheral surface and a heated metal anvil roll. It is good also as performing by sending in continuously the side seat | sheet 4a of the state by which it was piled up. The pattern of the protrusions formed on the outer peripheral surface of the embossing roll matches the pattern of the plurality of temporary fixing portions A. Thereby, the side sheet | seat 4a in which multiple temporary fixing parts A were formed in the desired pattern can be formed continuously and efficiently. In addition, as the embossing, for example, a method of joining sheet members by ultrasonic welding can be used.

  As shown in FIG. 3, the row A <b> 1 and the row A <b> 2 of the temporary fixing part A are formed in the overlapping region 45. As described above, a plurality of three-dimensional gather expansion / contraction members 44 are arranged at the tip portion of the side sheet 4 a that forms the three-dimensional gather 4. In this case, it is preferable that the row of temporary fixing portions A is formed on the outer side in the width direction with respect to the plurality of three-dimensional gather elastic members 44. That is, it is preferable that the row of temporary fixing portions A is provided between the outer edge 45 a that forms the outermost side in the width direction of the overlapping region 45 and the three-dimensional gather elastic member 44. As described above, the row of the temporary fixing portions A is formed between the outer edge 45a and the three-dimensional gather expansion / contraction member 44 in the overlapping region 45 of the side seat 4a, so that the touch of the three-dimensional gather 4 becomes flexible.

  Further, the rows A1 and A2 of the temporary fixing portions A are formed at intervals in the width direction. As shown in FIG. 3, the row A <b> 1 of the temporary fixing portion A is formed at a position near the three-dimensional gather elastic member 44, and the row A <b> 2 is formed at a position near the outer edge 45 a of the overlapping region 45. The distance between the row A1 of the temporary fixing portion A and the three-dimensional gather elastic member 44 is preferably 1 mm to 10 mm, or 3 mm to 5 mm, and particularly preferably within 3 mm. In this way, by making the row of the temporary fixing portions A and the distance of the three-dimensional gather expansion / contraction member 44 close, it is possible to prevent the positional deviation of the three-dimensional gather expansion / contraction member 44 from occurring when the main fixing portion B is formed. . In addition, the distance between the row A2 of the temporary fixing portion A and the outer edge 45a of the overlapping region 45 is preferably 5 mm to 20 mm, or 10 mm to 15 mm, and particularly preferably 5 mm to 10 mm. Moreover, it is preferable that the space | interval of the width direction of row | line | column A1 and row | line | column A2 of the temporary fix | stop part A is 8 mm-30 mm, 15 mm-25 mm, or 18 mm-22 mm. As described above, by forming the rows A1 and A2 of the temporary fixing portions A with a certain interval, the temporary joining of the first sheet portion 41 and the third sheet portion 43 can be reliably performed, and thereafter When the main joining is performed by the main stop B, the displacement between the sheets can be effectively prevented.

  Further, the pattern shown in FIG. 3 is formed with a plurality of first discarded portions A ′. The first discarding portion A ′ is provided at a position on the outer side in the width direction of the overlapping region 45 where the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 overlap. The plurality of first discarded portions A ′ are emboss points formed in regions other than the overlapping region 45 at the same time as forming the rows A1 and A2 of the temporary fixing portions A in the overlapping region 45 by the embossing described above. . For this reason, the first discarding portion A ′ does not particularly join the sheets. The plurality of first discarding portions A ′ form a row A′1 extending in the length direction in a region other than the overlapping region 45. As described above, the plurality of first discarding portions A ′ are pressed between the embossing roll and the anvil roll and continuously provided with the convex portions of the embossing roll in the circumferential direction, thereby suppressing rattling during processing. , Distributing pressure by increasing the number of contact points prevents excessive crimping. In the area other than the overlapping area 45, the first discarded portion A ′ is formed at the same time as the temporary fixing portion A, whereby the texture of the three-dimensional gather 4 is improved and the first sheet portion 41 by the temporary fixing portion A is obtained. And the joining of the 3rd sheet | seat part 43 can be stabilized.

On the other hand, in FIG. 3, the first seat portion 41, the second sheet portion 42, and the third seat portion 43 are joined together, and the second throw-away portion B ′ formed together with the present seat portion B is “ It is indicated by a “black circle”.
As shown in FIG. 3, in the overlapping region 45 where the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 overlap, there are a plurality of main stop portions B that join the respective sheet portions 41 to 43. Is formed. In the present embodiment, each of the fixed portions B is formed in a dot shape. In addition, in this-application specification, the point | piece point which joins each sheet | seat parts 41-43 is made into this fixed part B. FIG. The plurality of permanent stoppers B are formed in a plurality of rows along the length direction of the diaper (vertical direction in FIG. 3). In a certain row, a plurality of permanent stops B are formed at regular intervals in the length direction. The interval between the plurality of main stoppers B existing in a certain row may be, for example, 2 mm to 12 mm, 4 mm to 10 mm, or 6 mm to 8 mm. And the row | line | column which this some fixed part B makes is formed in multiple numbers at intervals in the width direction (left-right direction of FIG. 3) of a diaper. In the pattern shown in FIG. 3, as shown in FIG. 3C, the columns of the fixed portions B are arranged in the overlapping region 45 in order from the inner side in the width direction, columns B1, B2, B3, and It is formed of 4 rows of B4.

  As shown in FIG. 3, each of the rows B <b> 1 to B <b> 4 of the main fastening portion B is disposed at a distance in the width direction from the rows A <b> 1 and A <b> 2 of the temporary fastening portion A. That is, the plurality of final fastening portions B are formed without overlapping with the plurality of temporary fastening portions A. Thus, the row of temporary fixing portions A that join the first sheet portion 41 and the third sheet portion 43, and the main fastening portion that joins the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43. Since the rows B are arranged so as to be shifted in the width direction of the absorber, the respective sheet portions can be joined together evenly. Furthermore, if the row of the temporary fixing portions A and the row of the main fastening portions B coincide with each other, the overlapped portion becomes hard and causes a decrease in the texture of the sheet. Such problems can be prevented by shifting the rows.

  A method of forming the plurality of main fastening portions B is, for example, press-contacting between the embossing roll and the anvil roll in a state where the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 are stacked in the thickness direction. What is necessary is just to give the embossing which passes and joins each sheet | seat part. As an example of embossing, a method similar to the method used to form the plurality of temporary fixing portions A may be used.

  As shown in FIG. 3, the row B <b> 1, row B <b> 2, row B <b> 3, and row B <b> 4 of the stop B are formed in the overlapping region 45. Of the rows of the fixed portions B, the two rows of the rows B1 and B2 are formed in the region between the rows A1 and A2 of the temporary fixing portion A described above. It is preferable that the space | interval between row | line | column B1 and row | line | column B2 of this stop B is 10 mm-25 mm, 12 mm-20 mm, or 14 mm-16 mm. Further, among the row of the temporary fixing portions A and the row of the main fastening portions B, the row A1 of the temporary fastening portions A formed at the position closest to the three-dimensional gather elastic member 44 and the row of the main fastening portions B. The distance between the rows B1 formed at a position closest to the three-dimensional gather elastic member 44 is preferably 1 mm to 10 mm, or 2 mm to 5 mm. As described above, the first sheet portion 41 and the second sheet portion are formed by reducing the distance between the row A1 of the temporary fastening portion A and the row B1 of the permanent fastening portion B in a region near the three-dimensional gather expansion / contraction member 44. 42 and the 3rd sheet | seat part 43 can be joined reliably, and the malfunction that a sheet | seat peels during use of a diaper can be prevented. Further, the row B2 of the final stop portion B and the row A2 of the temporary stop portion A need not be as close as the distance between the row B1 and the row A1. In other words, the distance between the row B2 of the permanent fastening portion B and the row A2 of the temporary fastening portion A is longer than the distance between the row A1 of the temporary fastening portion A and the row B1 of the permanent fastening portion B. For example, the distance between the row B2 of the main fastening portion B and the row A2 of the temporary fastening portion A may be 3 mm to 20 mm, or 10 mm to 15 mm. In this way, the sheet portions 41 to 43 are joined in the region between the row A1 and the row A2 of the temporary fixing portion A by intentionally separating the distance between the row B2 of the main fastening portion B and the row A2 of the temporary fixing portion A. Can be done firmly.

  Of the rows of the final stop portions B formed in the overlap region 45, two rows, the row B3 and the row B4, are formed in the region between the row A2 of the temporary stop portion A and the outer edge 45a of the overlap region 45 described above. Has been. It is preferable that the space | interval between row | line | column B3 and row | line | column B4 of this stop B is 1 mm-8 mm, 2 mm-6 mm, or 3 mm-4 mm. In addition, the row B4 of the main stop B formed in the position closest to the outer edge 45a of the overlap region 45 in the row of the temporary stop A and the row of the main stop B, and the outer edge 45a of the overlap region 45. Is preferably 1 mm to 5 mm, 2 mm to 4 mm, or 2.5 mm to 3.5 mm. Furthermore, it is preferable that the distance between the row B3 of the final stop B and the row A2 of the temporary stop A is also about 1 mm to 5 mm, 2 mm to 4 mm, or 2.5 mm to 3.5 mm. That is, in the vicinity of the outer edge 45a of the overlapping region 45, it is preferable that the temporary fixing portion A and the main fixing portion B are densely formed. For example, as shown in FIG. 3, the interval between the row A2 of the temporary fixing portion A and the outer edge 45a of the overlapping region 45 is closer than the interval between the row A1 and the row A2 of the temporary fixing portion A. Yes. Further, the outer edge 45a of the overlapped area 45 and the row A2 of the temporary fixing portion A is larger than the distance between the row B1 and the row B2 of the main fastening portion B formed in the region between the row A1 and the row A2 of the temporary fixing portion A. The distance between the row B3 and the row B4 of the main stop B formed in the region between is closer. In this way, the bonding strength of the sheet portions 41 to 43 is increased at the base portion of the three-dimensional gather 4 by closely gathering the temporary fixing portion A and the main fixing portion B in the vicinity of the outer edge 45a of the overlapping region 45, and the three-dimensional gather. 4 has good shape retention.

  Further, as shown in FIG. 3, the row B1 and the row B2 of the main fastening portion B formed between the row A1 and the row A2 of the temporary fastening portion A, the row A2 of the temporary fastening portion A, and the overlapping region 45 Comparing the row B3 and row B4 of the main stoppers formed between the outer edges 45a, the lengths of the main stoppers B in the rows B1 and B2 are longer than those in the rows B3 and B4. However, it is getting bigger. That is, the distance in the length direction of the plurality of main stoppers B forming the rows B1 and B2 is larger than the distance in the length direction of the plurality of main stoppers B forming the rows B3 and B4. In this way, the air gap of the three-dimensional gather 4 is improved by forming a relatively large distance in the length direction of the main stoppers B forming a row in the region between the rows A1 and A2 of the temporary fixing portions A. ， Can prevent stuffiness while using diapers. For example, in the region between the row A1 and the row A2 of the temporary fixing portion A, the interval in the length direction of the plurality of main fastening portions B forming the row is the distance between the row A2 of the temporary fastening portion A and the outer edge 45a of the overlapping region 45 It is preferable that the pitch is 1.5 to 3 times or twice as long as the interval in the length direction of the main stop portions B forming a row in the region between them.

  Further, referring to FIG. 3, regarding the arrangement relationship between the row of temporary fixing portions A and the row of permanent fastening portions B, a three-dimensional gather expansion / contraction member in the row of temporary fastening portions A and the row of permanent fastening portions B will be described. The row formed at the position closest to 44 is the row A1 of the temporary fixing portion A. Further, the row formed at the position closest to the outer edge 45a of the overlapping region 45 in the row of the temporary fastening portion A and the row of the regular fastening portion B is the row B4 of the permanent fastening portion B. In addition, in the overlapping region 45, at least two rows A1 and A2 of the temporary fixing portions A are formed, and in the region between the rows A1 and A2 of the temporary fixing portions A, there are at least two rows. A row B1 and a row B2 of the stop B are formed. Further, in the region between the row A2 of the temporary fixing portion A and the outer edge 45a of the overlapping region 45, at least two rows B3 and B4 of the main stopping portion B are formed. By adopting such an arrangement relationship, first, the first sheet portion 41 and the third sheet portion 43 are temporarily joined by the rows A1 and A2 of the temporary fixing portions A, and then the rows B1 to B4 of the main fixing portions B. Thus, when the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 are joined together, the displacement of the sheet portions can be suppressed, and the joining strength between the sheet portions can be increased. That is, since the row B1 and the row B2 of the final stop B are formed in the row A1 and the row A2 of the temporary stop A that have already been temporarily joined, when forming the row B1 and the row B2 of the final stop B Displacement of the sheet portion is prevented. Further, when forming the rows B3 and B4 of the main fastening portion B, the vicinity of the outer edge 45a of the overlapping region 45 is also temporarily joined by the row A2 of the temporary fastening portion A. The rows B3 and B4 of the main stop B can be formed aiming between the rows A2 of A. Furthermore, the joint strength between the sheet portions is increased by forming the fixed portions B closely in the vicinity of the outer edge 45a of the overlapping region 45.

  In the pattern shown in FIG. 3, a plurality of second discarded portions B ′ are formed. The second discarded portion B ′ is provided at a position on the outer side in the width direction of the overlapping region 45 where the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 overlap. The plurality of second discarded portions B ′ are emboss points formed in regions other than the overlapping region 45 at the same time as forming the row B1 to the row B4 of the main stop portion in the overlapping region 45 by the embossing described above. For this reason, the second throw-away portion B ′ does not particularly join the sheets. The plurality of second discarded portions B ′ form a row B ′ 1 and a row B ′ 2 extending in the length direction in a region other than the overlapping region 45. Thus, by forming the second discarded portion B ′ at the same time as the main stop B in the area other than the overlapping region 45, the texture of the three-dimensional gather 4 is improved and the second stop B is formed by the main stop B. The joining of the 1st sheet part 41, the 2nd sheet | seat part 42, and the 3rd sheet | seat part 43 can be made more reliable.

  Moreover, in the pattern shown in FIG. 3, the shape of each temporary fixing part A and each permanent fixing part B is elliptical. Each elliptical shape has a major axis and a minor axis. The length of the major axis is, for example, 0.5 mm to 3 mm, 1 mm to 2 mm, and particularly preferably about 1.5 (± 5%). The length of the short axis is, for example, 0.2 mm to 1.5 mm, 0.5 mm to 1.2 mm, and particularly preferably about 1 mm (± 5%). Further, in the embossed pattern shown in FIG. 3, the major axes of the oval temporary fixing portion A and the main fixing portion B are inclined at a predetermined angle with respect to the length direction in which each row extends. The inclination of the major axis of the ellipse may be 10 degrees to 90 degrees, 20 degrees to 80 degrees, 30 degrees to 60 degrees, or 45 degrees. However, the shape of each temporary fixing part A and each permanent fixing part B is not limited to what is shown in the figure. The shapes of the temporary fixing portion A and the main fixing portion B may be, for example, a perfect circle shape, a triangular shape, a rectangular shape, a parallelogram shape, and other polygonal shapes. Moreover, it is good also as employ | adopting a multiple types thing as the shape of the temporary fix | stop part A and this fixed part B. FIG.

(2-5-2. Joining pattern of solid gathers: second example)
FIG. 4 shows an example of a pattern different from the pattern shown in FIG. 3 with respect to the pattern for joining the side sheets 4 a constituting the three-dimensional gather 4. 4A and 4B show a cross-sectional view (a) of the side seat 4a and a plan view (b) of the side seat 4a side by side in association with each other. FIG. 4C is an enlarged view showing the inside of the broken line frame shown in FIG. Also in FIG. 4, the “white circle” indicates the temporary fixing portion A that joins the first sheet portion 41 and the third sheet portion 43, and the first discarding portion A ′ that is formed together with the temporary fixing portion A. Yes. In addition, the “black circle” is a second stop portion formed together with the main stop portion B joining the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43, and the main stop portion B. B ′ is shown.

First, the common points of the bonding pattern shown in FIG. 3 and the bonding pattern shown in FIG. 4 are as follows.
The first common point is that a row of a plurality of temporary fastening portions A and a row of a plurality of permanent fastening portions B are provided at intervals in the width direction.
The second common point is that the row formed at the position closest to the three-dimensional gather expansion / contraction member 44 among the rows of the plurality of temporary fixing portions A and the main fastening portions B is the row of the temporary fixing portions A. Thus, the row formed at the position closest to the outer edge 45a of the overlapping region 45 is the row of the main stop B.
The third common point is that at least two rows of temporary fastening portions A are formed in the overlapping region 45, and at least two permanent fastening portions are provided in the region between the rows of temporary fastening portions A. This is the point where the row B is formed.
In addition, the fourth common point is that at least one row of main stop portions B is formed in the region between the row of temporary fixing portions A located outside in the width direction and the outer edge 45a of the overlapping region 45. It is a point.
In addition, the fifth common point is that the region between the row of temporary fixing portions A and the outer edge 45a of the overlapping region 45 is closer to the temporary fixing portion A than the region between two rows of temporary fixing portions A. And this stop part B is the point formed densely.
Furthermore, the sixth common point is that the interval in the length direction of the plurality of main fastening portions B forming a row in the region between the rows of the two temporary fastening portions A is different from the row of the temporary fastening portions A and the overlapping region 45. The point is that the pitch is larger than the interval in the length direction of the main stoppers B forming a row in the region between the outer edges 45a.
By having such a common point, the pattern shown in FIG. 3 and the pattern shown in FIG. 4 both suppress the deviation when joining the three overlapping sheet parts, and also between the sheet parts. It is possible to increase the bonding strength.

On the other hand, the bonding pattern shown in FIG. 3 is different from the bonding pattern shown in FIG. 4 in the following points.
The first difference is that in the pattern shown in FIG. 4, only three columns B1, B2, and B3 are formed in order from the inner side in the width direction. That is, the pattern of FIG. 4 is common to the pattern of FIG. 3 in that the row B1 and the row B2 of the main fastening portion B are located between the row A1 and the row A2 of the temporary fastening portion A. The difference is that only the row B3 of the stop B is located between the row A2 of A and the outer edge 45a of the overlapping region 45. For this reason, the row formed at the position closest to the outer edge 45a of the overlapping region 45 in the row of the temporary fastening portion A and the row of the permanent fastening portion B is the row B3 of the permanent fastening portion B.
Further, the second difference is that in the pattern shown in FIG. 4, only one row of the second discarding portions B ′ formed together with the main stop portion B is formed. That is, in the pattern of FIG. 3, two rows of second discarded portions B ′ are formed in a region other than the overlapping region 45, but in the pattern of FIG. , Only one row is formed in a region other than the overlapping region 45.

  As described above, the first sheet portion 41, the second sheet portion 42, and the like, as in the bonding patterns shown in FIG. 3 and FIG. 4, within a range that does not impair the technical significance brought about by the bonding pattern unique to the present invention. The bonding pattern of the third sheet portion 43 can be modified as appropriate. In the present invention, the pattern for joining the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 is not limited to those shown in FIGS. 3 and 4, and these patterns are referred to. Those skilled in the art can make appropriate modifications within the obvious range.

(2-5-3. Other Embodiments of Solid Gather)
Next, an embodiment having a structure different from the three-dimensional gather shown in FIG. 2 will be described with reference to FIGS. 5 and 6. 5 and 6 are sectional views showing a state in which the absorbent main body is cut in the width direction, similarly to FIG.
In the present invention, the three-dimensional gather 4 is configured by arranging a third sheet portion 43 between the first sheet portion 41 and the second sheet portion 42. Here, the first sheet portion 41 and the third sheet portion 43 are joined by a plurality of temporary fixing portions A. In addition, the first sheet portion 41, the second sheet portion 42, and the third sheet portion 43 are joined by a plurality of main fastening portions B.
As long as these conditions are satisfied, the three-dimensional gather included in the present invention can have not only the embodiment shown in FIG. 2 but also the structure shown in FIGS. 5 and 6 below.
That is, in the embodiment shown in FIG. 2, each of the pair of left and right three-dimensional gathers 4 is formed by one side sheet 4a, and when viewed in the width direction, the first sheet portion 41 is the innermost. The second sheet portion 42 is positioned on the outermost side, and the third sheet portion 43 is positioned between them. However, the present invention is not limited to this embodiment.

  In FIG. 5, each of the pair of left and right three-dimensional gathers 4 is formed by a single side sheet 4a, and when viewed in the width direction, the first sheet portion 41 is located on the outermost side, and the second sheet portion 42 is An embodiment is shown in which the third sheet portion 43 is located in the innermost position and located in the middle thereof.

  In the embodiment shown in FIG. 5, the second folded portion 47 formed between the first sheet portion 41 and the second sheet portion 42 corresponds to the upper end edge of the three-dimensional gather 4 and the first sheet portion 41. Is formed by folding the side sheet 4a toward the outer side in the width direction at the second folded portion 47. In addition, a first folded portion 46 is formed between the first sheet portion 41 and the third sheet portion 43, and the third sheet portion 43 is the first folded portion 46, and the side seat 4 a is the first seat portion 4 a. It is formed by being folded between the sheet portion 41 and the second sheet portion 42. Thereby, in the standing part of the three-dimensional gather 4, the first sheet portion 41 is located on the outermost side, the second sheet portion 42 is located on the innermost side, and the third sheet portion 43 is located in the middle thereof. Is formed.

  Further, as shown in FIG. 5, at least one or more of the plurality of three-dimensional gather elastic members 44 forming the three-dimensional gather 4 are sandwiched between the first sheet portion 41 and the second sheet portion 42. Thus, it is preferable to fix to the upper end edge of the three-dimensional gather 4 or its vicinity. In the embodiment of FIG. 5, three three-dimensional gather expansion / contraction members 44 are arranged on the standing portion of the three-dimensional gather 4 along the longitudinal direction of the three-dimensional gather 4, and two of them are close to the upper edge. A three-dimensional gather elastic member 44 is sandwiched between the first sheet portion 41 and the second sheet portion 42. Further, as shown in FIG. 5, it is preferable that at least one three-dimensional gather expansion / contraction member 44 is also disposed in the overlapping region 45 where the three sheets 41 to 43 overlap in the standing portion of the three-dimensional gather 4. In this case, at least one of the plurality of three-dimensional gather elastic members 44 is sandwiched between the first sheet portion 41 and the third sheet portion 43 or between the second sheet portion 42 and the third sheet portion 43. It is preferable that they are fixed. In the embodiment shown in FIG. 5, among the plurality of three-dimensional gather expansion / contraction members 44 arranged at the standing portion of the three-dimensional gather 4, the three-dimensional gather expansion / contraction member 44 arranged on the base end side of the three-dimensional gather 4 is the first. It is disposed between the second sheet portion 42 and the third sheet 43.

  As shown in FIG. 5, in the present invention, the first sheet portion 41 of the three-dimensional gather 4 is formed on the outermost side in the width direction, the second sheet portion 42 is formed on the innermost side in the width direction, and the third sheet portion is formed. 43 can also be positioned between these.

  Subsequently, FIG. 6 shows an embodiment in which each of the pair of left and right three-dimensional gathers 4 is formed by two sheet members. That is, each three-dimensional gather 4 forms the 1st sheet | seat part 41 located inside, and the 2nd sheet | seat part 42 located in the outer side by one sheet 4a seeing in the width direction. On the other hand, the third sheet portion 43 located between the first sheet portion 41 and the second sheet portion 42 is formed by a sub-sheet 4b that is a separate member from the side seat 4a.

  In the embodiment shown in FIG. 6, the second folded portion 47 formed between the first sheet portion 41 and the second sheet portion 42 corresponds to the upper end edge of the three-dimensional gather 4 and the first sheet portion 41. Is formed by folding the side sheet 4a toward the inner side in the width direction in the second folded portion 47. A sub sheet 4 b that forms the third sheet portion 43 is interposed between the first sheet portion 41 and the second sheet portion 42. Thereby, in the standing part of the three-dimensional gather 4, the first sheet part 41 is located on the innermost side, the second sheet part 42 is located on the outermost side, and the third sheet part 43 as a separate member is located between them. A triple structure is formed.

  The sub-sheet 4b forming the third sheet portion 43 may be made of the same material as the side sheet 4a forming the first sheet portion 41 and the second sheet portion 42, or may be made of different materials. It may be. For example, when the sub-sheet 4b is made of another material, it is possible to use an olefin resin sheet such as polyethylene or polypropylene that exhibits liquid impermeability, and at least a liquid shielding property.

  As shown in FIG. 6, in the present invention, the first sheet portion 41 and the second sheet portion 42 of the three-dimensional gather 4 are configured by folding one sheet member, and the other third sheet portion 43 is different from this. It can also be constituted by a separate sheet member. In addition, in FIG. 6, although the example comprised only by the 3rd sheet | seat part 43 by a separate member was shown, each of the 1st sheet | seat part 41, the 2nd sheet | seat part 42, and the 3rd sheet | seat part 43 which comprises the solid gathers 4 was shown. Can be all separate members.

(2-6. Cover sheet)
The cover sheet 6 is a member for reinforcing the back sheet 2 and improving its feel. As shown in FIG. 2, the cover sheet 6 is bonded to the side of the back sheet 2 facing the clothing. The cover sheet 6 may be superposed and bonded to a part of the side sheet 4a. As a material constituting the cover sheet 6, a woven fabric or a non-woven fabric is used. In particular, it is preferable to use a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester as a material constituting the cover sheet 6.

(2-7. Front body exterior body and back body exterior body)
As shown in FIG. 1, the front body exterior body 8 and the back body exterior body 9 are in contact with the wearer's abdomen and back when wearing the disposable diaper, and the front body exterior body 8 and the back body exterior body 9 It is a member for suspending the absorptive main body 7 located between them.

  The front body exterior body 8 and the back body exterior body 9 have a pair of side seal portions 81 and 91 at the left and right side edges in the width direction of the diaper. The front body exterior body 8 and the rear body exterior body 9 are joined at a pair of side seal portions 81 and 91 in a state where the left and right side edges in the width direction of the diaper are overlapped with each other. For example, the pair of side seal portions 81 and 91 extend in the length direction of the diaper and are linearly formed. In the side seal portions 81 and 91, the front body exterior body 8 and the back body exterior body 9 are joined by a known joining means such as hot emboss welding or ultrasonic emboss welding.

  The front body exterior body 8 and the back body exterior body 9 are configured by, for example, bonding two sheet members of an inner sheet and an outer sheet. The inner sheet is disposed on the surface (skin contact surface) side that contacts the wearer's skin, and the outer sheet is disposed on the surface (skin non-contact surface) side that does not contact the wearer's skin. The inner sheet and the outer sheet may be separately formed sheet materials, for example, formed integrally by folding one sheet material at a position corresponding to the edge of the waist opening of the disposable diaper. It may be. Further, another sheet member may be interposed between the inner sheet and the outer sheet. The inner sheet and the outer sheet are formed of, for example, a flexible fiber nonwoven fabric, a plastic sheet, or a laminate sheet thereof. The inner sheet and the outer sheet are bonded by, for example, a hot melt adhesive. Furthermore, between the inner sheet and the outer sheet, a plurality of elastic elastic members disposed along the width direction of the disposable diaper are fixed in an extended state at intervals in the length direction. The elastic elastic members 7 arranged in the front body exterior body 8 and the back body exterior body 9 form a gather around the waist and the abdomen of the front body exterior body 7 and the back body exterior body 8. By forming the gathers, the flexibility and adhesion of the front body exterior body 8 and the back body exterior body 9 can be enhanced. It is preferable to use a thread-like elastic rubber for a plurality of elastic elastic members. Examples of such rubber materials include styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene. Known materials such as butadiene, silicone, or polyester can be used.

(3. Manufacturing method of sheet member)
Then, with reference to FIG. 7, the process of manufacturing the sheet | seat member which comprises the three-dimensional gather 4 contained in the said disposable diaper 100 is demonstrated. Here, the manufacturing method of the sheet | seat member which comprises the solid gathers 4 of embodiment shown by FIG. 2 especially is demonstrated.

As shown in FIG. 7, in step S <b> 1, one original side sheet 104 a constituting a pair of left and right three-dimensional gathers 4 is prepared. In the stage of step S1, the original side seat 104a is integrated with a left solid gather and a right solid gather.
In the present specification, “original side sheet” or the like means a raw material that becomes a side sheet or the like when the disposable diaper is manufactured through the manufacturing process.

  A plurality of original three-dimensional gather expansion / contraction members 144 are arranged on the original side sheet 104a along the flow direction (the direction of the arrow shown in FIG. 7). The plurality of original three-dimensional gather expansion / contraction members 144 are fixed at predetermined intervals in the width direction of the original side sheet 104a in an extended state along the flow direction. The position where the original three-dimensional gather expansion / contraction member 144 is fixed is the vicinity of the outer side in the width direction of the second folded portion 147 formed between the original first sheet portion 141 and the original second sheet portion 142 of the original side sheet 104a. It is.

  Next, in step S <b> 2, both side edges on the outer side in the width direction of the original side sheet 104 a are folded back toward the inner side in the width direction at the first folded portion 146 formed along the flow direction. As a result, the original side sheet 104 a is partially folded back with the first folded portion 146 as a base point to become the original third sheet portion 143. The original third sheet portion 143 is a portion that is located between the original first sheet portion 141 and the original second sheet portion 142 later. Further, the original side sheet 104 a is folded by the first folding unit 146, so that a portion overlapping the original third sheet unit 143 becomes the original first sheet unit 141. In this way, in the original side sheet 104a, the original third sheet portion 143 and the original first sheet portion 141 are overlapped. In addition, as shown in FIG. 7, when the original third sheet portion 143 and the original first sheet portion 141 are overlapped, at least one of the original three-dimensional gather expansion / contraction member 144 is sandwiched therebetween. Is preferred. In step S2, when the original side sheet 104a is folded, a known device such as the first sailor 210 may be used.

  Next, in step S3, embossing is performed on the portion of the original side sheet 104a where the original third sheet portion 143 and the original first sheet portion 141 overlap. The original third sheet portion 143 and the original first sheet portion 141 are joined together by a temporary fixing portion A formed in a plurality of rows along the flow direction. The temporary fixing part A for joining the original third sheet part 143 and the original first sheet part 141 may be formed by a known embossing device. The first embossing device 220 presses and passes between the embossing roll and the anvil roll along the flow direction in a state where the original first sheet portion 141 and the original third sheet portion 143 overlap each other. The first embossing device 220 includes, for example, a heated metal embossing roll having a plurality of minute convex portions on the outer peripheral surface, and a heated metal anvil roll. The original side sheet 104a in a state where the original third sheet portion 143 and the original first sheet portion 141 are overlapped is continuously fed between the embossing roll and the anvil roll, so that the original third sheet portion 143 and the original first sheet portion 143 are fed. One sheet portion 141 is joined in a predetermined pattern. The pattern of the protrusions formed on the outer peripheral surface of the embossing roll matches the pattern of the plurality of temporary fixing portions A. Thereby, the temporary fix | stop part A can be continuously formed efficiently with a desired pattern. In addition, the first embossing device 220 may form the temporary fixing portion A continuously with respect to the original side sheet 104a, and simultaneously form the first discarding portion A ′ along the flow direction. Good.

  Next, in step S4, a second folded portion in which the overlapping portion of the original third sheet portion 143 and the original first sheet portion 141 joined by the row of the plurality of temporary fixing portions A is formed along the flow direction. In 147, it is folded back inward in the width direction. As a result, the original second sheet portion 142 is formed on the original side sheet 104a so as to face the folded portion with the second folded portion 147 as a base point. In addition, the original side sheet 104a has an original third sheet portion 143 interposed between the original first sheet portion 141 and the original second sheet portion 142, so that an overlapping region 145 where the sheets overlap is formed. As shown in FIG. 7, when the original side sheet 104a is folded by the second folding part 147, at least the original three-dimensional gather expansion / contraction member 144 is interposed between the original first sheet part 141 and the original second sheet part 142. It is preferable that one is clamped. In step S4, when the original side sheet 104a is folded, a known device such as the second sailor 230 may be used.

  Next, in step S5, embossing is performed on the overlapping region 145 where the original first sheet portion 141, the original second sheet portion 142, and the original third sheet portion 143 overlap in the original side sheet 104a. The original side sheet 104a is joined in the overlap region 145 by the main stop B formed in a plurality of rows along the flow direction. The original first sheet part 141, the original second sheet part 142, and the original third sheet part 143 are joined simultaneously by the main stop B. What is necessary is just to perform formation of this stop part B which joins each original sheet part 141-143 with a well-known embossing apparatus. The second embossing device 240 presses and passes between the embossing roll and the anvil roll along the flow direction in a state where the original sheet portions 141 to 143 are overlapped. The second embossing device 240 has, for example, a heated metal embossing roll having a plurality of minute convex portions on the outer peripheral surface and a heated metal anvil roll. The original side sheets 104a in a state where the original sheet portions 141 to 143 are overlapped are continuously fed between the embossing roll and the anvil roll so that the original sheet portions 141 to 143 are simultaneously joined in a predetermined pattern. The The pattern of the convex part formed in the outer peripheral surface of the embossing roll is in agreement with the pattern of the plurality of permanent fastening parts B. Thereby, this stop part B can be continuously and efficiently formed with a desired pattern. Thus, the joining pattern of the original side sheet 104a joined by the temporary fastening part A and the final fastening part B is shown in FIG. 3 and FIG. Since the joining pattern of the original side sheet 104a has already been described with reference to FIGS. 3 and 4, a detailed description thereof will be omitted. In addition, the second embossing device 240 may continuously form the final stop portion B on the original side sheet 104a and simultaneously form the second discarded portion B ′ along the flow direction. Good.

  Next, in step S6, the original side sheet 104a in which the original first sheet portion 141, the original second sheet portion 142, and the original third sheet portion 143 are joined by the plurality of temporary fixing portions A and the main fixing portions B, Along the center line in the width direction, it is divided into one forming a left solid gather and one forming a right solid gather. The original side sheet 104a may be divided using a known cutter 250. Thus, the sheet | seat member used for the three-dimensional gather of a disposable diaper is manufactured.

  Thereafter, a disposable diaper including a three-dimensional gather may be manufactured using the divided original side sheet 104a according to a known manufacturing method. For example, when manufacturing the disposable diaper of the form shown in FIG.1 and FIG.2, the parted original side sheet 104a is joined to the original top sheet which coat | covers an absorber from the skin contact surface side. Thereafter, the original side sheet 104a is further joined to an original back sheet that covers the absorbent body from the skin non-contact surface side, and a gather expansion / contraction member is disposed around the original leg portion at the folded position of the original side sheet 104a. Gather around the part. In addition, the original cover sheet is disposed at a portion that is located closest to the skin non-contact surface side. Thereby, the continuous body of an absorptive main body is manufactured. The continuous body of the absorbent main body is divided into lengths corresponding to each one used for disposable diapers, and is made into individual absorbent main bodies. , It is fixed so as to be bridged over a continuous body of the back body exterior body. Then, the continuous body of the front body exterior body and the continuous body of the back body exterior body are overlapped and joined at a site corresponding to the side seal portion. Then, a pants-type disposable diaper is manufactured by cutting the continuous body of the front body exterior body and the continuous body of the back body exterior body at a predetermined width constituting each disposable diaper.

  As mentioned above, in this specification, in order to express the content of this invention, it demonstrated focusing on preferable embodiment of this invention, referring drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

  The present invention relates to a method for manufacturing a sheet member used for, for example, disposable diapers for elderly people or infants, disposable diapers, and the like. For this reason, the disposable diaper of this invention can be utilized suitably in the industry regarding care or child care, the manufacturing industry of a disposable diaper, etc.

DESCRIPTION OF SYMBOLS 1 ... Top sheet 2 ... Back sheet 3 ... Absorber 4 ... Solid gather 4a ... Side sheet 5 ... Leg part gathers 6 ... Cover sheet 7 ... Absorbent main body 8 ... Front body exterior body 9 ... Rear body exterior body 41 ... First 1 sheet part 42 ... 2nd sheet part 43 ... 3rd sheet part 44 ... Solid gathering elastic member 45 ... Overlapping region 45a ... Outer edge 46 ... 1st folding | returning part 47 ... 2nd folding | returning part 51 ... Gather expansion-contraction around leg parts Member 52 ... Third folded part 81 ... Side seal part 91 ... Side seal part A ... Temporary fastening part A '... First throwing part B ... Final fastening part B' ... Second throwing part 100 ... Disposable diaper

Claims (5)

A liquid permeable topsheet (1);
A liquid-impermeable backsheet (2);
An absorber (3) interposed between the top sheet (1) and the back sheet (2);
A pair of three-dimensional gathers (4) formed along the length direction of the absorber (3) on both left and right ends in the width direction of the absorber (3);
A disposable diaper having
The three-dimensional gather (4)
A first sheet portion (41);
A second sheet portion (42);
A third sheet portion (43) disposed between the first sheet portion (41) and the second sheet portion (42),
Of the first sheet part (41), the second sheet part (42), and the third sheet part (43), only the first sheet part (41) and the third sheet part (43) are joined. A plurality of temporary fastening portions (A) are provided in a plurality of rows along the length direction;
A plurality of main fastening portions (B) joining the first sheet portion (41), the second sheet portion (42), and the third sheet portion (43) are arranged in a plurality of rows along the length direction. Is provided, and
In the overlapping region (45) where the first sheet portion (41), the second sheet portion (42), and the third sheet portion (43) overlap, the temporary fixing portion (A) and the main fixing portion ( B) There are at least two columns,
In the overlap region (45), at least one row of the main fastening portions (B) is located between the rows of the temporary fastening portions (A) provided in at least two rows, and at least A disposable diaper in which at least one row of the temporary fastening portions (A) is positioned between the rows of the main fastening portions (B) provided in two rows. The pair of three-dimensional gathers (4)
One or a plurality of three-dimensional gathered elastic members (44) are arranged along the length direction at the front end portion in the width direction,
Among the row of the temporary fastening portions (A) and the row of the final fastening portions (B),
The row formed at a position close to the three-dimensional gather expansion / contraction member (44) is a row of temporary fixing portions (A),
The disposable diaper of Claim 1. The row | line | column currently formed in the position close | similar to the front-end edge of the width direction outer side of the said superimposition area | region (45) is a row | line | column of this stop part (B). The first sheet portion (41), the second sheet portion (42), and the third sheet portion (43), wherein the basis weight is composed of 8 g / ^{m 2} or more 25 g / ^{m 2} or less of the nonwoven fabric The disposable diaper of Claim 1 or Claim 2. The first sheet portion (41), the second sheet portion (42), and a sheet including a third seat portion (43) disposed between said first sheet portion (41) and the second sheet portion (42) A method for manufacturing a member, comprising:
A plurality of temporary fixing portions provided in one or a plurality of rows along the first direction by press-contacting the first sheet portion (41) and the third sheet portion (43) in an overlapped state. Forming (A), and joining the first sheet portion (41) and the third sheet portion (43) in the temporary fixing portion (A);
After the first step, the second sheet part (42) is further pressed against the first sheet part (41) and the third sheet part (43) in a state of being pressed in the first direction. Forming a plurality of main fastening portions (B) provided in one or a plurality of rows along the first fastening portion (B), the first sheet portion (41), the second sheet portion (42), And a second step of joining the third sheet portion (43),
The row of the temporary fixing portions (A) and the row of the main fixing portions (B) are provided at intervals in a second direction orthogonal to the first direction. In the overlapping region (45) where the first sheet portion (41), the second sheet portion (42), and the third sheet portion (43) overlap, the temporary fixing portion (A) and the main fixing portion ( B) There are at least two columns,
In the overlap region (45), at least one row of the main fastening portions (B) is located between the rows of the temporary fastening portions (A) provided in at least two rows, and at least The manufacturing method of the sheet | seat member of Claim 4. The row | line | column of the said temporary fix | stop part (A) is located between the row | line | columns of the said main stop part (B) provided in 2 rows.

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