JP2018015360A - Tape type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a surface material of a side flap part from being damaged by a fastening tape even when flexible and air-permeable nonwoven fabric is used for a skin side surface of the side flap part.SOLUTION: A fastening tape 10 folds a distal end side of a fastening base material 30 to a skin side surface of a base end side at a folding line 33 along a diaper longitudinal direction of a projection direction intermediate part in a folded state before a diaper is used, and the surface of hook material 31 is covered with the fastening base material 30. The hook material 31 is provided for the distal end side and the base end side with the folding line 33 as a boundary respectively, and the hook materials 31 are arranged at positions that do not overlap when the fastening base material 30 is folded.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a tape-type disposable diaper in which the nonwoven fabric on the skin contact surface side of the side flap portion is not damaged by the hook material of the fastening tape in a folded state before using the diaper.

  Conventionally, tape-type disposable diapers provided on the market are, as shown in FIGS. 9 and 10, a waterproof sheet 51 made of polyethylene or the like disposed on the non-skin side, a nonwoven fabric disposed on the skin side, or the like. A liquid-permeable top sheet 52, a substantially rectangular absorbent body 53 disposed between the waterproof sheet 51 and the top sheet 52, a breathable back sheet 54 that forms the outermost surface of the product, Mainly composed of mechanically-joined fastening tapes 58, 58 provided on both sides of the diaper. On both sides of the diaper, a gather sheet 55 made of nonwoven fabric or the like provided on the skin side, and its inner edge A three-dimensional gather BS standing on the skin side is formed by the elastic elastic member 56 disposed along the back surface 54, and the back sheet 54 extends laterally from the side edge of the absorbent body 53. The side flap portion SF without the absorber 53 is formed by the portion and the gather sheet 55 portion, and a plurality of elastic elastic members 57, 57... Are arranged on the side flap portion SF along the longitudinal direction of the diaper. Thus, a pleated planar gather GK is formed in the side flap portion SF. The fastening tape 58 is folded to the skin contact surface side of the side flap portion SF in a folded state before using the diaper, and the hook sheet 59 of the fastening tape 58 forms the skin contact surface of the side flap portion SF. The surface of 55 is temporarily fixed.

  Examples of the disposable diaper having such a structure include the following Patent Documents 1 and 2. In the following Patent Document 1, a fastening tape is folded in a Z-shaped folding structure, and a third folded portion and a diaper main body are temporarily fixed by a third temporary fixing portion so as to be peelable. Moreover, in the following patent document 2, the tape base material integrally has a base material tip portion protruding toward the tape tip side from the fastening material, and the base material tip portion is folded back to the fastening material side. It covers a part of the surface of the fastening material and is bonded onto the surface of the fastening material, and the fastening material is not fastened to the counterpart fastening material in a region covered by the tip of the base material. What was made into the picking piece at the time of fastening material peeling is disclosed.

JP 2013-198693 A JP-A-2015-93111

  In recent years, soft and highly breathable non-woven fabrics such as air-through non-woven fabrics and air-through apertured non-woven fabrics have been used as the surface material constituting the skin contact surface of the side flaps for the purpose of softening the touch and improving air permeability. Adopted disposable diapers are available on the market.

  However, in the thing of the said patent document 1, the surface of the side sheet in a diaper main body by the 3rd temporary fix part which a fastening tape (fastening tape) consists of a strip | belt-shaped adhesive agent coating part in the folding state before diaper use. Since the temporary fixing to the diaper main body of the fastening tape is peeled off at the time of wearing, the adhesive of the third temporary fixing part remains on the surface of the side sheet, or the side of the adhesive of the third temporary fixing part. There is a possibility that the fibers of the sheet may stick together and the surface of the side sheet may become fluffy, which may damage the surface material of the side flap portion, and the touch feeling may be deteriorated at the time of wearing. Moreover, in the thing of the said patent document 2, although the base-material front-end | tip part is turned back to the fastening material side and has covered a part of surface of the fastening material, in the folded state before diaper use, a fastening tape is used. Since it is considered that the fastening material is folded back to the skin side surface of the side flap portion and temporarily fixed to the skin side surface of the side flap portion, the surface material of the side flap portion is the same as that described in Patent Document 1. There was concern that the feeling of touch would be worsened when worn or worn.

  Therefore, the main problem of the present invention is to provide a tape-type disposable diaper that prevents the surface material of the side flap portion from being damaged by the fastening tape even when a non-woven fabric that is flexible and has good air permeability is used on the skin side surface of the side flap portion. There is to do.

In order to solve the above-mentioned problem, as the present invention according to claim 1, a side flap portion extending laterally from the side edge of the absorber is formed, and laterally on both side portions on the back side of the side flap portion. In a tape-type disposable diaper provided with a fastening tape provided with a hook material fixed to the skin side surface of the fastening base material while being protruded,
The fastening tape is in a folded state before use of the diaper, and the front end side of the fastening base material is folded back to the skin side surface on the base end side along a fold line along the longitudinal direction of the diaper in the protruding direction, and the surface of the hook material is A tape-type disposable diaper characterized by being covered with the fastening base material is provided.

  In the invention of the first aspect, in order to prevent the surface material of the side flap portion from being damaged by the fastening tape in the folded state before using the diaper, the hook material of the fastening tape is used as in the conventional case. The surface of the hook material is not temporarily fixed to the skin side surface, but by folding the front end side of the fastening base material to the skin side surface on the base end side along the diaper longitudinal direction of the diaper in the protruding direction of the fastening tape. It is covered with a fastening substrate. For this reason, the surface material of the side flap part can be prevented from being damaged or fluffed, and even when a surface material that is flexible and has excellent air permeability such as an air-through nonwoven fabric or an air-through non-woven fabric is used, the characteristics of the surface material Can be maintained.

  As a second aspect of the present invention according to claim 2, the hook material is provided on each of the fastening base material on the distal end side and the fastening base material on the proximal end side with the fold line as a boundary, and the hook material includes the fastening base material. The tape-type disposable diaper according to claim 1, wherein the tape-type disposable diaper is disposed at a position that does not overlap each other when folded.

  In the invention according to the second aspect, the hook member is provided in each of the region on the distal end side and the proximal end side with respect to the fold line of the fastening base material. At this time, the hook members are arranged so that they do not overlap each other when the fastening base material is folded back, so that the surface of the hook material is surely covered with the fastening base material. Thus, by providing the hook material on each of the distal end side and the proximal end side of the fastening base material, a separation portion is formed between the both hook materials, and the fastening tape is attached to the outer surface of the stomach side when the diaper is mounted. When fastened, the fastening strength can be improved as compared to when fastened at one location, and it is fastened by two hook materials with a narrow fastening width apart in the direction of the waist. Will be improved.

  As a third aspect of the present invention, a knob portion is formed by a distal end portion of a fastening base material that extends to the distal end side of the hook material, and the knob portion is formed at the proximal end portion at the folding line. A tape-type disposable diaper according to any one of claims 1 and 2, wherein a folded fold is attached so that the tip protrudes toward the skin side when the substrate is folded.

  In the invention of claim 3, the tip of the fastening substrate that extends to the tip side of the hook material so that the fastening tape can be easily picked up from the state where the fastening tape is folded before using the diaper. The knob forms a knob. It is preferable to make this knob easy to pick when wearing a diaper by attaching a crease with a tip protruding toward the skin side to the base end.

  As a fourth aspect of the present invention, a knob portion is formed by a tip portion of a fastening base material that extends to the tip side of the hook material, and the knob portion folds the fastening base material at the fold line. In the state of being folded back to the non-skin side at the base end portion of the portion protruding sideward from the side flap portion, the side flap portion is provided to protrude sideward from the side edge. 2. A tape-type disposable diaper according to any one of 2 is provided.

  In the invention of claim 4, the tip of the fastening base that extends to the tip side of the hook material so that the fastening tape can be easily picked up from the state where the fastening tape is folded before using the diaper. It is a 2nd form example which forms a knob | pick part by a part. The knob portion according to the second embodiment is a state in which the fastening base material is folded back at the fold line and folded back to the non-skin side at the base end portion of the portion protruding sideward from the side flap portion. Thus, the side flap portions are provided so as to protrude from the side edges. For this reason, while the fastening tape is folded back more compactly to the diaper main body side in the folded state before using the diaper, the knob portion protrudes laterally from the side edge of the diaper main body and is easily picked.

  As this invention which concerns on Claim 5, the temporary fix | stop means for hold | maintaining the state turned back to the non-skin side in the base end part of the part which protrudes to the side rather than the said side flap part of the said fastening tape is given. A disposable tape diaper according to claim 4 is provided.

  In the invention of claim 5, in the second embodiment of the knob portion, in order to maintain the state where the portion protruding to the side from the side flap portion of the fastening tape is folded back to the non-skin side of the side flap portion, Temporary fixing means such as pin embossing is applied from the outer surface side of the folded portion.

As this invention which concerns on Claim 6, the said disposable diaper is a liquid-permeable top sheet which covers the skin side of the said absorber, the waterproof sheet which covers the non-skin side of the said absorber, and the non-skin side of this waterproof sheet A back sheet made of an air-through nonwoven fabric or an air-through aperture nonwoven fabric, and a gather sheet that forms a three-dimensional gather standing on the skin side on both sides of the skin side,
The tape type disposable diaper in any one of Claims 1-5 by which the folding | turning part which turned up the width direction both sides of the said back sheet to the skin side is arrange | positioned at the skin side, having the overlap margin with the said gather sheet. Provided.

  In the invention of claim 6, in order to dispose a sheet material made of an air-through non-woven fabric or an air-through-perforated non-woven fabric on the skin side surface of the side flap portion, the folded portions are formed by folding the widthwise both sides of the back sheet to the skin side. Is placed on the skin side. As a result, since the sheet material constituting the skin contact surface of the side flap portion is made of an air-through nonwoven fabric or an air-through apertured nonwoven fabric, the side and leg surroundings when worn are flexible and ventilated. It becomes excellent in nature. By folding both sides of the backsheet to the skin side, manufacturing can be simplified and the side flaps can be simplified without increasing the number of parts compared to attaching another member to the skin side of the side flap. The touch of the part can be made flexible and the air permeability can be improved.

  According to a seventh aspect of the present invention, a planar gather in which an elastic stretchable member is disposed along the longitudinal direction is formed in the side flap portion, and a folded portion of the back sheet overlaps with the planar gather. A tape-type disposable diaper is provided.

  In the invention described in claim 7, since the same material as the back sheet having a good touch is disposed at a position overlapping the flat gather on the skin side surface of the side flap portion, the elastic stretch member forming the flat gather at the side flap portion causes the skin to Troubles can be reduced.

  As the present invention according to claim 8, the elastic expansion and contraction member is a region that overlaps an overlap margin between the folded portion of the back sheet and the gather sheet, and is disposed between the waterproof sheet and the gather sheet. Item 7. A tape-type disposable diaper according to item 7, is provided.

  In the invention of claim 8, as the arrangement position of the elastic elastic member forming the flat gathers in the side flap portion, the inner portion of the base of the leg by the elastic elastic member can not be tightened, and sweat rash, rough skin, etc. In order to reduce skin troubles, it is preferable to dispose the region between the waterproof sheet and the gather sheet, which overlaps the overlap margin between the folded portion of the back sheet and the gather sheet.

  The tape-type disposable diaper according to any one of claims 7 and 8, wherein the back sheet and the gather sheet are not bonded to each other in an area overlapping with an arrangement area of the elastic stretchable member. Provided.

  In the invention according to the ninth aspect, since the back sheet and the gather sheet are not adhered to each other in the region overlapping with the arrangement region of the elastic elastic member, it is possible to make the contact of the flat gather more flexible.

  As described above in detail, according to the present invention, it is possible to prevent the surface material of the side flap part from being damaged by the fastening tape even when a non-woven fabric having flexibility and good air permeability is used for the skin side surface of the side flap part.

It is a partial fracture development view of disposable diaper 1 concerning the present invention. It is the II-II arrow directional view of FIG. It is the III-III arrow directional view of FIG. It is an end elevation on the back side in the folded state before using the diaper. FIG. 3 is a perspective view showing how to fasten the fastening tape 10. FIG. 3 is a cross-sectional view showing a folding point of the fastening tape 10. It is sectional drawing which shows the folding | turning point of the fastening tape 10 which concerns on a 2nd form example. It is sectional drawing which shows the arrangement | positioning aspect of the fastening tape 10 which concerns on another example of a form. It is an expanded view of the conventional disposable diaper. It is sectional drawing (the XX arrow line view of FIG. 9) of the conventional disposable diaper.

[Basic configuration of disposable diapers]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this document, “longitudinal direction” means a direction connecting the front side and the rear side of the disposable diaper 1, and “width direction” means a direction orthogonal to the longitudinal direction (left and right direction when the disposable diaper 1 is unfolded). .

  As shown in FIG. 1 to FIG. 3, the present disposable diaper 1 (hereinafter, also simply referred to as a diaper) is made of cotton-like pulp or the like, and has a certain degree of rigidity such as an hourglass shape (or rectangular shape), for example. An absorbent body 4 surrounded by an encapsulating sheet 5 made of crepe paper or nonwoven fabric, and a liquid-permeable top sheet 3 made of a porous or non-porous nonwoven fabric covering the skin side (use surface side) of the absorbent body 4 And a waterproof sheet 6 made of polyethylene or the like covering the non-skin side (back side) of the absorbent body 4 and a non-woven fabric disposed on the non-skin side of the waterproof sheet 6 and defining a diaper profile. 2 and the gather sheets 7 and 7 which form solid gathers BS and BS standing on the skin side on both sides of the skin side, and extend outward in the width direction from the liquid permeable top sheet 3, and the liquid permeable property. Mainly composed of a second sheet 14 made of a hydrophilic non-woven fabric disposed adjacent to the non-skin side of the wrap sheet 3, and mechanically joined fastening tapes 10, 10 provided on both sides of the diaper back side, and In the periphery of the absorbent body 4, the outer edge portions of the back sheet 2, the waterproof sheet 6, and the liquid-permeable top sheet 3 are joined at the upper and lower edge portions thereof by an adhesive such as hot melt, heat seal, ultrasonic seal, or the like By joining by means, an end flap portion EF in which the absorber 4 does not exist is formed, and the back sheet 2 that extends laterally from the absorber 4 at both side edges of the absorber 4, Absorbing by joining the outer edges of the waterproof sheet 6 and the gather sheet 7 with an adhesive such as hot melt, or a joining means such as heat sealing or ultrasonic sealing. There are those side flaps SF without intervention is formed.

  For wearing, after putting the front and back bodies of the diaper 1 on the wearer's body, the fastening tapes 10 and 10 are brought to the abdomen side, and the front target tape provided on the outer surface side of the back sheet 2 11 is engaged with the diaper.

In the following, each component will be specifically described in detail.
As the liquid-permeable top sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, an air through method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunbond method and thermal bond method are excellent in terms of flexibility and drape, and the air-through method and spunlace method are excellent in terms of being bulky and soft. As said liquid-permeable top sheet 3, let the embossing roll which consists of a convex roll provided with two or more convex parts on the roll surface, and a concave roll provided with two or more recessed parts into which the said convex part fits on the roll surface pass. Therefore, it is desirable to use a material having an uneven embossed surface. Concavities and convexities formed on the surface of the top sheet suppress the surface diffusion rate of soft stool and are easily absorbed by the absorber in the vicinity of the defecation region.

  The absorbent body 4 is composed of, for example, absorbent fibers such as fluffy pulp and a superabsorbent polymer. In the illustrated example, in order to reduce the contact with the legs, the inner side in the width direction is provided on each side of the middle of the diaper. It has a substantially hourglass shape having a concave notch 19 that is recessed. The superabsorbent polymer is, for example, granular powder and is mixed in the pulp constituting the absorber 4.

  As the encapsulating sheet 5 surrounding the absorbent body 4, crepe paper, hydrophilic nonwoven fabric, or the like is allowed to pass through body fluid or the like without inhibiting the body fluid absorption into the absorbent body 4, and so that the absorbent body 4 does not collapse. Any sheet that retains its shape may be used. The encapsulating sheet 5 can be a non-porous sheet or a porous sheet in which a large number of apertures are formed.

  The waterproof sheet 6 is made of a sheet material having at least a water shielding property such as an olefin resin sheet such as polyethylene or polypropylene, and is installed in a range covering at least the entire area of the absorber 4 in order to prevent leakage. In recent years, those having moisture permeability are preferably used from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  In the illustrated example, the width dimension of the liquid-permeable top sheet 3 is slightly longer than the width of the absorbent body 4 and narrower than the waterproof sheet 6, as shown in the cross-sectional views of FIGS. It only stops covering the absorbent body 4, and the outer side of the absorbent body 4 is a gather sheet 7 different from the liquid-permeable top sheet 3, specifically, prevents body fluid from penetrating or enhances the feeling of touch. Depending on the purpose, a gather sheet 7 made of a nonwoven material subjected to appropriate water repellent treatment or hydrophilic treatment is disposed.

  The gather sheet 7 extends outward from the vicinity of the side edge of the absorbent body 4 and is bonded and fixed to the waterproof sheet 6 and the back sheet 2, and a side flap SF is constituted by these laminated sheet portions. In the side flap portion SF, a planar gather GK is formed by arranging a plurality of elastic elastic members 8 and 8 in the illustrated example along the diaper longitudinal direction. The flat gather GK holds the diaper tightly around the legs when worn, thereby improving fit and preventing the diaper from shifting.

  On the other hand, a three-dimensional gather BS standing on the surface side is formed by the non-woven fabric sheet portion on the inner side of the fixed portion of the gather sheet 7. This three-dimensional gather BS has an upright end in the vicinity of the side edge of the absorbent body 4, and its tip is folded back twice along the longitudinal direction of the diaper. In the illustrated example, a single elastic elastic member 9 is provided so that the three-dimensional gather BS is erected using the elastic force.

  As the elastic elastic members 8 and 9, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester and the like that are usually used can be used. .

Moreover, as the gather sheet 7, a non-woven fabric having a high barrier property is used. The water pressure resistance (JIS L 1092) is 80 mmH ₂ O or higher, preferably 100 mmH ₂ O or higher, which is higher than the back sheet 2. Therefore, it is often inferior to the back sheet 2 in any of the quality items related to comfort at the time of wearing such as touch, soft bulkiness, and air permeability.

  The material fibers that make up the nonwoven fabric can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or amide, recycled fibers such as rayon or cupra, natural fibers such as cotton, and spunbond. Nonwoven fabric obtained by an appropriate processing method such as a method, a thermal bond method, an air-through method, a melt blown method, or an SMS method can be used. The gather sheet non-woven fabric preferably has a fiber thickness of 2.2 dtex or less in order to obtain an appropriate barrier property. The spun bond method, thermal bond method, and melt blown method are preferable because they are thin and have excellent drape properties and high density, and the SMS method that combines the spun bond nonwoven fabric and the melt blown method is particularly preferable.

The basis weight of the nonwoven fabric is preferably 8 to ²⁰ g / m ² , particularly about 10 to 15 g / m ² . (Using an automatic thickness measuring apparatus KES-G5 Handy Compression measurement program, load: 10 gf / cm ^2, and the pressure area: measured under the conditions of 2 cm ²⁾ nonwoven fabric thickness is preferably 0.1 to 0.4 mm, the The density obtained by dividing the basis weight of the nonwoven fabric with numbers is about 0.05 to 0.15 g / m ³ . Moreover, the thing whose air permeability measured according to JIS L1096 air permeability A method (fragile type method) is 40 cc / cm < ² > * sec or less, especially 30 cc / cm < ² > * sec or less and low air permeability is preferable.

  A second sheet 14 made of a hydrophilic non-woven fabric can be interposed between the liquid-permeable top sheet 3 and the absorbent body 4 and adjacent to the non-skin side of the liquid-permeable top sheet 3. The second sheet 14 can be a non-porous sheet or a porous sheet in which a large number of apertures are formed. As the hydrophilic nonwoven fabric, recycled fibers such as rayon and cupra, natural fibers such as cotton are used, or the material itself has hydrophilicity, or olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. A synthetic fiber having a hydrophilic property can be suitably used by using a fiber that has been subjected to a surface treatment with a hydrophilizing agent to impart a hydrophilic property.

[Back sheet 2]
As the back sheet 2, a perforated or non-porous nonwoven fabric is used. The basis weight of the nonwoven fabric is preferably 15 to 35 g / m ² , particularly about ²⁰ to 30 g / m ² .

  As the material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. The thickness is preferably about 1.2 to 4.4 dtex, and obtained by an appropriate processing method such as an air-through method, a spunlace method, a spunbond method, a thermal bond method (point bond method), a melt blown method, a needle punch method, or the like. Nonwoven fabric can be used. As the nonwoven fabric for the back sheet, a soft and bulky material (low density) is preferably used, and therefore, an air-through method or a spunlace method is preferable. Among these non-woven fabrics, non-woven fabrics manufactured by an air-through method in which heated air is sent in the drum conveyance process during non-woven fabric manufacturing and the fibers are heat-sealed are particularly preferable, and the fibers are fused by the heat of high-temperature air. Has advantages such as high and soft feeling and bulkiness. Non-woven fabrics that fix fibers by thermal embossing, such as the spunbond method and thermal bond method, are excellent in flexibility and drape, but tend to be thin and dense, but have a low embossing rate (less than 12%) Is preferable because it becomes relatively bulky.

  The nonwoven fabric obtained by the air-through method can be used as an air-through nonwoven fabric or an air-through aperture nonwoven fabric. The air-through non-woven fabric is a non-woven fabric that has not been subjected to a hole opening treatment particularly obtained by an air-through method, and the air-through hole nonwoven fabric is a pin embossing well known in the art to a non-woven fabric obtained by an air-through method, Alternatively, a hole forming process is performed to form a large number of fine holes by a suction method or the like.

(Using an automatic thickness measuring apparatus KES-G5 Handy Compression measurement program, load: 10 gf / cm ^2, and the pressure area: measured under the conditions of 2 cm ²⁾ nonwoven fabric thickness is preferably 0.5 to 1.5 mm, the The density obtained by dividing the basis weight of the nonwoven fabric with numbers is about 0.01 to 0.05 g / m ³ . Moreover, the thing whose air permeability measured according to JIS L 1096 air permeability A method (fragile type method) is 50 cc / cm ² · sec or more, particularly 60 cc / cm ² · sec or more and high air permeability is preferable.

  As shown in detail in FIG. 3, the back sheet 2 is arranged on the skin side with folded portions 20 that have both end portions in the width direction folded back on the skin side while having an overlap margin S with the gather sheet 7. At the same time, a double sheet portion 21 of the backsheet 2 is formed on each side portion of the disposable diaper 1 in which the backsheet 2 portion disposed on the non-skin side and the backsheet 2 portion of the folded portion 20 are laminated. It is preferable to do so.

  The double sheet portion 21 of the backsheet 2 includes the gather sheet 7 in which the backsheet 2 portion arranged on the non-skin side and the backsheet 2 portion of the folded portion 20 folded back on the skin are directly laminated and waterproof. This is a portion where the sheet 6 is not interposed. In the double sheet portion 21, the back sheets 2 and 2 are joined to each other by a hot melt adhesive or the like within a predetermined range. The double sheet portion 21 is formed on the outer side in the diaper width direction from the waterproof sheet 6 and the gather sheet 7 and is formed over substantially the entire length in the diaper longitudinal direction. As shown in FIG. 3, the double sheet portion 21 is continuously covered at both ends (front and rear end portions) in the longitudinal direction of the diaper so that the folded end portion of the back sheet 2 wraps around the diaper side edge. However, in the middle part of the diaper, as shown in FIG. 2, in consideration of the fit around the leg, notches 19 are provided on both side edges of the diaper and are bounded inward in the width direction. The diaper both side edge part containing a part is cut off, and it has the structure which laminated | stacked the back sheets 2 and 2 on the non-skin side and the skin side, respectively.

  In the present disposable diaper 1, the folded portion 20 of the back sheet 2 is arranged on the skin side while having an overlap margin S with the gather sheet 7, so that it gathers up to the side edge of the disposable diaper like a conventional disposable diaper. Compared with the case where the sheet is extended, the folded-back portion 20 of the back sheet 2 having a good touch improves the touch of the side flap portion SF without increasing the number of parts. Further, since the folded back portion 20 of the back sheet 2 that is comfortable to touch is disposed on the skin side surface of the side flap portion SF, skin troubles are caused by the elastic elastic members 8 and 8 that form the planar gathers GK in the side flap portion SF. Can be reduced.

  Furthermore, since the double sheet part 21 of the back sheet 2 which laminated | stacked the folded back sheets is provided in the both sides of the disposable diaper 1, respectively, the touch of the both sides of a diaper may be made still smoother. In addition, the air permeability on both sides can be improved.

  The gather sheet 7 is preferably arranged so that the outer side edge in the diaper width direction is equal to or more inside than the side edge of the waterproof sheet 6. That is, the gather sheet 7 is preferably arranged in a region overlapping the waterproof sheet 6 so as not to extend outward in the diaper width direction from the waterproof sheet 6. Thereby, the range in which the gather sheet 7 is interposed in the side flap portion SF is reduced, and the air permeability of the side flap portion SF can be reliably improved. Accordingly, the double sheet portion 21 of the back sheet 2 is formed outside the waterproof sheet 6 in the diaper width direction, and the flexibility around the legs can be further increased. When the outer side edge of the gather sheet 7 in the diaper width direction is positioned inside the side edge of the waterproof sheet 6, the separation length in the diaper width direction between the edge of the gather sheet 7 and the side edge of the waterproof sheet 6 is , Within 20 mm, preferably within 10 mm. When arranged on the inner side with a distance longer than 20 mm, the planar gather GK formed by arranging the elastic elastic members 8 and 8 in the laminated portion of the gather sheet 7 and the waterproof sheet 6 is biased too much inward. Become.

  In the double sheet portion 21 of the back sheet 2, the back sheets may be joined to each other with a hot melt adhesive or the like as shown in FIG. 21, it is preferable that the back sheets are non-adhered to each other within a predetermined range (range of distance L) from the folded end of the back sheet 2 and the inner range is joined. Thereby, the skin contact of the diaper side edge of the front body and the back body can be softened. The distance L from the folded end to the inside is 3 to 15 mm (at least 3 mm and a maximum of 15 mm), preferably 5 to 10 mm. Further, in the case where concave notch portions 19 that are recessed inward in the width direction are formed on both side portions in the middle of the diaper longitudinal direction, the range is within 1 to 10 mm, preferably within 2 to 5 mm, from the notch portion 19 to the inside. The back sheets may be non-adhered to each other. Thereby, the skin contact around the legs can be softened.

  The overlap margin S between the folded portion 20 of the back sheet 2 and the gather sheet 7 is preferably formed in a range overlapping the waterproof sheet 6. The width W (length in the diaper width direction) of the overlap margin S is preferably 10 to 30 mm. In the illustrated example, the overlap margin S is formed by a gather sheet 7 portion extending outward in the width direction from the liquid-permeable top sheet 3, but the gather sheet 7 including a laminated portion with the liquid-permeable top sheet 3 is used. The overlap margin S may be formed. It is desirable to dispose the elastic elastic members 8 and 8 forming the planar gather GK in a range overlapping with the overlap margin S.

  In the overlap margin S, the back sheet 2 and the gather sheet 7 may be joined over the entire surface with a hot-melt adhesive or the like, but as shown in FIG. The area overlapping with the back sheet 2 is preferably a non-adhesive area 22 between the back sheet 2 and the gather sheet 7. As a result, the portion of the back sheet 2 that is not joined to the gather sheet 7 makes the elastic elastic members 8 and 8 softer against the skin and further improves the flexibility around the legs. In addition, it is preferable to provide the said non-bonding part in the intermediate part of the overlap margin S which does not reach the outer edge of the said overlap allowance S, especially the inner edge of a diaper width direction. That is, in the overlap margin S, the back sheet 2 and the gather sheet 7 are bonded at least at both ends in the longitudinal direction where the elastic elastic members 8, 8 are not disposed and along the folded edge of the back sheet folded portion 20. It is preferable to do so.

  By the way, in this disposable diaper 1, as shown in FIG.1 and FIG.3, it is preferable to arrange | position the waist sheet 12 which has a stretching property in the diaper width direction to the non-skin side from the absorber 4 of the back side. In the waist sheet 12, a plurality of elastic members that expand and contract in the diaper width direction are arranged between the breathable nonwoven fabrics in a stretched state at intervals in the diaper longitudinal direction. In disposing the waist sheet 12, both side portions of the waist sheet 12 are disposed outside the waterproof sheet 6 in the diaper width direction and extend to the double sheet portion 21 of the back sheet 2. It is preferable to do so. Thereby, in the back side, since the elasticity of the diaper width direction is provided between the double sheet parts 21 and 21 of the back sheet 2 on both sides, the fit around the waist is improved.

[Fastening tape 10]
Next, the mechanical joining type fastening tape 10 will be described. As shown in FIG. 1, the fastening tape 10 has a base portion of a fastening base material 30 such as plastic, polylaminated nonwoven fabric, nonwoven fabric, paper, etc. joined to a diaper. A hook member 31 is fixed to the protruding piece portion of the fastening base material 30 and to the skin side surface (surface on the liquid-permeable top sheet 3 side). The hook material 31 is bonded to the fastening base material 30 with an adhesive so as not to be peeled off. The hook member 31 has a large number of engagement pieces 32, 32... On its surface (outer surface).

  As shown in detail in FIG. 5 (A), the fastening base material 30 includes a mounting part 30 </ b> A for a disposable diaper and a base body part 30 </ b> B that protrudes laterally from the side flap part SF. ing. The diaper attaching part 30A has a substantially rectangular shape having a longitudinal edge in the diaper longitudinal direction, the base body main part 30B continuously protrudes laterally from the outer edge of the diaper attaching part 30A, and the hook material 31 is It is stuck.

  When the fastening tape 10 is attached to both sides on the back side, as shown in FIG. 3, in the disposable diaper 1 of the present embodiment, both sides of the back sheet 2 are folded back to the skin side. It is preferable to join the part 30A to the outer surface side of the back sheet 2 arranged on the non-skin side. Joining to the skin side surface of the folded portion 20 folded back on the skin side of the backsheet 2 is not preferable because the flexibility of the side flap portion SF decreases.

  In the disposable diaper 1, before use of the diaper, as shown in FIG. 4, the side flap portions SF are each folded inward (skin side) and folded in half in the longitudinal center portion ( Product status).

  In the folded state before using the diaper, the fastening tape 10 is folded in a predetermined form so that the surface of the hook material 31 is covered with the fastening base material 30. As shown in FIG. 5 and FIG. 6, as the first embodiment in which the fastening tape 10 is folded back, the front end side of the fastening base material 30 is the base end side at the folding line 33 along the longitudinal direction of the diaper in the protruding direction. The entire surface of the hook material 31 is covered with the fastening base material 30, and the hook material 31 is detachably joined to the fastening base material 30.

  In this way, by folding back the fastening tape 10 in a predetermined form, the sheet material constituting the skin contact surface of the side flap portion SF is constituted by an air-through nonwoven fabric or an air-through aperture nonwoven fabric, and the side portions and the legs are touched. However, even when the disposable diaper is flexible and excellent in air permeability, the surface material of the side flap portion SF can be prevented from being damaged by the fastening tape 10 in the folded state before the diaper is used. In other words, in conventional disposable diapers, the hook material of the fastening tape was temporarily fixed to the skin side surface of the side flap, so that when the fastening tape was peeled off during wearing, the surface of the side flap would become fuzzy and scratched. However, in this disposable diaper 1, the surface of the hook material 31 is covered with the fastening base material 30. However, the surface of the hook material 31 is covered with the fastening base material 30. Therefore, the nonwoven fabric of the side flap portion SF can be prevented from being damaged by the hook material 31, and the feeling of touch when worn is not lowered, and the breathability of the nonwoven fabric can be maintained.

  As shown in FIGS. 5 and 6, the hook material 31 is provided on the fastening base material 30 on the distal end side and the fastening base material 30 on the proximal end side with respect to the folding line 33, so that the protruding direction It is preferable to arrange them at two positions apart from each other. 5 and 6, the inner hook material is 31a and the outer hook material is 31b. These hook members 31a and 31b are arranged at positions that do not overlap each other when the fastening base material 30 is folded back at a fold line 33. For this reason, when the fastening base material 30 is folded back, the hook material 31 is surely covered with the fastening base material 30. By disposing the hook material 31 on each of the distal end side and the proximal end side of the fastening base material 30, when the fastening tape 10 is fastened to the front target tape 11 on the abdomen side when the diaper is worn, it is fastened at one place. The fastening strength can be improved more than the case, and since the two hook members 31a and 31b that are spaced apart in the waist direction and have a narrow fastening width are fastened, the followability to the movement of the body at the time of wearing is improved. Become.

  The hook material 31 is preferably formed to have the same width in both places, but may be formed to have different widths. The width of the hook material 31 is preferably 10 to 15 mm. The separation width of the two hook members 31a and 31b may be a width that does not overlap the hook members 31a and 31b when folded at the fold line 33, but is substantially the same as the width dimension of the hook member 31. Is preferred. Thereby, when the front end side edge of the inner hook member 31a is folded back as the fold line 33, the two hook members 31a and 31b are arranged close to each other, the folded state becomes compact, and the appearance is improved. It becomes good. On the other hand, the distance between the inner hook member 31a and the side edge of the side flap portion SF is preferably 3 to 10 mm, preferably 4 to 8 mm larger than the width of the hook member 31. When the fastening tape 10 is folded, if the outer hook material 31b is disposed in the vicinity of the side edge of the side flap portion SF, the hook material 31b is caught on the side edge of the side flap portion SF by some external force, and the side flap Since the surface material of the portion SF may be damaged, it is preferable that the hook material is arranged with a sufficient margin.

  The fold line 33 is preferably provided along the front end side edge of the inner hook member 31a or in the vicinity thereof. Thereby, when the fastening base material 30 is folded back at the fold line 33, the folded state becomes compact and the appearance is improved.

  Next, as a second embodiment in which the fastening tape 10 is folded back, as shown in FIG. 7, the front end side of the fastening base material 15 is folded back to the skin side on the base end side at the fold line 33, and the fastening base material 15 may be folded into a Z-shaped cross section by folding back 15 to the non-skin side of the side flap portion SF at the base end portion of the portion protruding sideward from the side flap portion SF. Thereby, since the main-body part of the fastening tape 10 does not protrude sideward rather than the side flap part SF, it becomes a more compact package and an external appearance becomes favorable.

  In the second form example of the folded state, in order to maintain the folded state on the non-skin side of the side flap portion SF at the base end portion of the portion projecting to the side of the side flap portion SF of the fastening tape 10. It is preferable to apply the temporary fixing means. As shown in FIG. 7C, the temporary fixing means can be constituted by one or a plurality of pin embosses applied from the outer surface side (non-skin side) of the fastening tape 10.

  The fastening tape 10 preferably has a knob 34 formed by a tip portion of a fastening base material 30 that extends to the tip side of the hook material 31b on the tip side. This picking part 34 is for making it easy to pick up when the folded state of the fastening tape 10 is unfolded when the diaper is mounted. In the first embodiment in the folded state shown in FIGS. 4 to 6, the knob 34 is formed at the fold line 33 at the proximal end (the portion along the distal end side edge of the hook member 31 b on the distal end side). In a state where the fastening base material 30 is folded, it is preferable that a crease is attached so that the tip protrudes toward the skin side. Thereby, the picking part 34 becomes easy to pick. This crease is preferably attached so that the tip protrudes outward in the oblique width direction on the skin side. As a result, as shown in FIG. 4, even when the knob 34 is crushed in the folded state before using the diaper, it is possible to prevent the crease from being released.

  On the other hand, in the second embodiment in the folded state shown in FIG. 7, the knob portion 34 folds the fastening base material 30 along the fold line 33 and is a base of a portion protruding sideward from the side flap portion SF. It is preferable to arrange so that it protrudes to the side rather than the side edge of the side flap portion SF in a state where the end portion is folded back to the non-skin side. Thereby, the picking part 34 becomes easy to pick.

[Other examples]
(1) In the above embodiment, the skin contact surface of the side flap portion SF is formed by disposing the folded portions 20 on the skin side of the side flap portion SF. Although the sheet material to be formed is made of an air-through nonwoven fabric or an air-through apertured nonwoven fabric, as shown in FIG. 8, an air-through nonwoven fabric or an air-through opening that is a separate member from the back sheet 2 is formed on the skin side of the side flap portion SF. You may arrange | position the sheet | seat material 40 which consists of a hole nonwoven fabric. At this time, the fastening tape 10 may be fixed to the outer surface side of the back sheet 2 or may be fixed between the back sheet 2 and the sheet material 40 as shown in FIG. Good.

(2) In the above embodiment, the hook material 31 of the fastening tape 10 is provided at two locations that are separated in the protruding direction. However, only one location is provided on the fastening base material on the tip side of the folding line 33. Also good.

  DESCRIPTION OF SYMBOLS 1 ... Disposable diaper, 2 ... Back sheet, 3 ... Liquid-permeable top sheet, 4 ... Absorber, 5 ... Encapsulating sheet, 6 ... Waterproof sheet, 7 ... Gather sheet, 8.9 ... Elastic elastic member, 10 ... Fastening Tape 11, front target tape 12, waist sheet 20 fold-back portion 21, double sheet portion 22 non-bonded area 30 fastening material 31 hook material 32 engagement piece 33 Folding line, 34 ... knob

Claims (9)

Side flap portions that extend laterally from the side edges of the absorbent body are formed, provided on both sides of the back side of the side flap portions so as to protrude laterally, and a hook material is provided on the skin side surface of the fastening base material. In a tape-type disposable diaper provided with a fastening tape that is fixed,
The fastening tape is in a folded state before use of the diaper, and the front end side of the fastening base material is folded back to the skin side surface on the base end side along a fold line along the longitudinal direction of the diaper in the protruding direction, and the surface of the hook material is A tape-type disposable diaper, which is covered with the fastening base material.   The hook material is provided on each of the fastening base material on the distal end side and the fastening base material on the proximal end side with respect to the fold line, and the hook material is positioned so as not to overlap each other when the fastening base material is folded back. The tape-type disposable diaper according to claim 1, which is disposed on the top.   A knob portion is formed by a distal end portion of the fastening base material extending to the distal end side with respect to the hook material, and the knob portion is in a state where the fastening base material is folded back at the fold line at the proximal end portion. The tape-type disposable diaper according to any one of claims 1 and 2, wherein folds are attached so that the lip protrudes toward the skin side.   A knob part is formed by the tip part of the fastening base material extending to the tip side from the hook material, and the knob part folds the fastening base material at the fold line and is lateral to the side flap part. The tape-type disposable according to any one of claims 1 and 2, wherein the tape-type disposable is provided so as to protrude laterally from the side edge of the side flap portion in a state of being folded back to the non-skin side at the base end portion of the portion protruding to Diapers.   The tape-type disposable according to claim 4, wherein temporary fastening means is provided to hold the folded-back state on the non-skin side at the base end portion of the fastening tape that protrudes laterally from the side flap portion. Diapers. The disposable diaper includes a liquid-permeable top sheet that covers the skin side of the absorbent body, a waterproof sheet that covers the non-skin side of the absorbent body, and an air-through nonwoven fabric or an air-through opening disposed on the non-skin side of the waterproof sheet. A back sheet made of non-woven fabric, and a gather sheet that forms a three-dimensional gather standing on the skin side on both sides of the skin side,
The tape type disposable diaper in any one of Claims 1-5 by which the folding | turning part which turned up the width direction both sides of the said back sheet to the skin side is arrange | positioned at the skin side, having the overlap margin with the said gather sheet.   The tape-type disposable diaper according to claim 6, wherein a planar gather in which an elastic elastic member is disposed along a longitudinal direction is formed on the side flap portion, and a folded portion of the back sheet overlaps with the planar gather.   The tape-type disposable diaper according to claim 7, wherein the elastic elastic member is an area overlapping an overlap margin between the folded portion of the back sheet and the gather sheet, and is disposed between the waterproof sheet and the gather sheet.   The tape-type disposable diaper according to any one of claims 7 and 8, wherein the back sheet and the gather sheet are non-adhered in an area overlapping with an arrangement area of the elastic elastic member.

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