JP6210585B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper (hereinafter referred to as “tape-type diaper”) that is worn on a wearer by fastening fastening tapes provided on both sides of the back side of the diaper to the abdominal outer surface of the diaper. is there.

  A tape-type diaper that has been marketed in the past is provided with a fastening base sheet that protrudes outward at both ends on the back side of the diaper, and two upper and lower protruding parts that protrude outward from the fastening base sheet are formed. In many cases, an adhesive layer or a hook-and-loop fastener element is provided on the inner surface of the protruding portion.

  In addition, two separate upper and lower fastening base material sheets projecting outward are provided at both ends of the back side of the diaper, and an adhesive layer and a hook-and-loop element are provided on the inner surface of the front end side of the base material sheet. There are also known. However, in the case of this form, when attaching two upper and lower fastening base material sheets to a diaper main body, since alignment for two pieces is needed, production efficiency worsens. Therefore, it is preferable that the number of substrate sheets provided at both ends on the back side of the diaper is one at one end and one at the other end.

  The wearing method of this tape-type diaper that is commercially available can be arbitrarily determined by the wearer, but the following two methods are popular.

  The first method is “normal stop” in which the upper and lower two-stage protrusions are fixed to the ventral outer surface of the diaper in a substantially parallel state. This wearing method is often seen when the wearer has a standard figure or a fat figure.

  The second method is “cross-stop” in which the upper and lower two-stage protrusions are crossed with each other and fastened to the ventral outer surface of the diaper. This wearing method is often seen when the wearer is thin.

  There are various problems with diapers that enable cross-stopping.

  For example, the upper and lower fastening portions overlap each other, and the fastening portion that is attached first disturbs the attachment of the fastening portion that is attached later, or reduces the attachment strength. Further, in order to avoid overlapping, it may be necessary to bother the mounting position of the fastening part to be mounted later from the optimum position. In order to solve such a problem, Patent Document 1 proposes a diaper in which the dimensions along the lateral direction of the upper fastening portion and the lower fastening portion are different from each other.

  In addition, in the process of manufacturing the fastening base sheet, if the base sheet is cut by a wavy periodic curve in order to eliminate generation of trim (excess waste), from the base end of the protruding portion to the adhesive layer or the hook-and-loop fastener The distance of inevitably becomes shorter. Such a fastening base sheet is difficult to cross-stop. In order to solve such a problem, Patent Document 2 proposes a diaper in which a perforation is formed from the outer edge to the inner side with respect to the fastening portion between the protruding portions. By tearing the perforation, a sufficient distance from the base end of the protruding portion to the adhesive layer or the hook-and-loop fastener can be secured, thereby enabling cross-fastening.

JP 2011-224099 A JP 2005-160506 A

  In addition to the problems of Patent Documents 1 and 2, as shown in FIG. 10, when cross-stopping, the base portion of the upper and lower two-stage protrusions (in FIG. 10, the base material between the upper and lower two-stage protrusions Since the sheet is torn, the torn end) will stand up. Then, there is a problem that wrinkles occur when pressure is applied to the raised portion 19 and the raised portion is crushed. Since this base part overlaps many layers, this wrinkle part becomes harder than other parts. Moreover, a level | step difference also arises according to the number of sheets which a base material sheet overlaps. Therefore, when the wearer is sleeping sideways, if this heel part comes between the bedding or the like and the body, pressure is applied to the iliac part, and pressure ulcers may be formed.

  By not performing the cross stop, the above problem can be solved. However, there is a problem that the diaper is difficult to fit on the wearer's body when the wearer is thin if the cross is not stopped.

  Then, the main subject of this invention is providing the diaper which a wrinkle does not produce easily in the base material sheet between the protrusion parts of the upper and lower two steps | paragraphs when cross-stopping.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A fastening base sheet that protrudes outward is provided on both sides of the back side of the diaper, and at least two upper and lower protrusions that protrude outward from the base sheet are formed, and the inner surface of the protrusion The disposable diaper is provided with fastening means including an adhesive layer or a hook-and-loop fastener element, and fastens the base sheet to the ventral outer surface of the diaper via the fastening means,
In between the upper and lower protrusions, mountain fold line is formed in a substantially horizontal direction toward the proximal side from the distal end of the base sheet,
A notch is formed obliquely from the distal end side end of the mountain fold line or an extension line to the distal end side toward the proximal end side,
A disposable diaper characterized in that a valley fold line is formed from a base end side end portion of the mountain fold line or an extension line to the base end side toward an intermediate portion or base end side end portion of the cut .

(Function and effect)
Since the base sheet is bent along the folding line, it is possible to prevent bending at unintended locations. As a result, it is possible to prevent a part of the base material sheet from overlapping several layers and the part from becoming extremely harder than the other part.
In addition, the degree of freedom of the cross stop is improved by the amount of the diagonal cut.

Delete

Delete

<Invention of Claim 2 >
The notches are disposable diaper according to claim 1, wherein provided obliquely downward toward the base end side from the distal end side of the base sheet.

(Function and effect)
When cross-stopping, it is easier to bring the diaper into close contact with the wearer's body if the lower protrusion is fastened before the upper protrusion. At the same time, the body can be properly tightened with a diaper.

  Therefore, in the present invention, the cut is provided obliquely downward. This makes it difficult for wrinkles to enter the base sheet when the lower protrusion is first fastened and cross-stopped.

<Invention of Claim 3 >
The slit is claim 1 or 2 disposable diaper according provided obliquely upward toward the proximal side from the distal end side of the base sheet.

(Function and effect)
By providing the notches obliquely upward, wrinkles are unlikely to enter the base sheet when the upper protrusion is first fastened and cross-stopped.

<Invention of Claim 4 >
The disposable diaper according to any one of claims 1 to 3 , wherein an angle between the cut and the mountain fold line is in a range of 30 ° to 60 °.

(Function and effect)
It is preferable that the angle formed by the upper protrusion and the lower protrusion when cross-stopped is in the range of 60 ° to 120 ° for ease of cross-stop. When the upper protruding portion and the lower protruding portion are fixed at the above-mentioned angle, the angle between the notch and the fold line is within a range of 30 ° to 60 °, so that the base sheet is less likely to be wrinkled. Become.

<Invention of Claim 5 >
The disposable diaper of Claim 1 with which the elastic elastic member was provided in the front-end | tip part of the said base material sheet toward the base end side from the front end side of the said base material sheet.

(Function and effect)
Since the front-end | tip part of a base material sheet is expanded-contracted, when carrying out cross stop, an upper side protrusion part or a lower side protrusion part can be pulled inside the width direction of a diaper, and can be fastened. And even if it is a case where it fixes at such a position, a wrinkle becomes difficult to enter into a base material sheet.

  As described above, according to the present invention, when cross-stopping is performed, wrinkles are less likely to occur in the base material sheet between the two upper and lower protruding portions.

It is the top view which looked at the diaper concerning this invention from the inner surface side. It is the top view to which the base material sheet part of FIG. 1 was expanded. It is the top view which showed the example which provided the cut in diagonally downward toward the base end side from the front end side edge of a base material sheet, and provided the cut also in diagonally upward. A plane showing an example in which a notch is provided in a substantially horizontal direction from the front end side edge to the base end side of the base sheet, and a cut is further provided obliquely downward from the base end part of the notch toward the base end side. FIG. It is the plane which showed the example which provided the elastic expansion-contraction member in the front-end | tip part of the base material sheet. It is a top view when the base material sheet which concerns on this invention is cross-stopped (when it fixes by setting the angle between an upper side protrusion part and a lower side protrusion part to 90 degrees). It is the top view which showed the example which spaced apart the front end side edge part of a notch, and the front end side edge part of a bending line. It is the top view which showed the example which spaced apart the front end side edge part of a notch | incision, and the front end side edge part of a fold line from the front end side edge of a base material sheet. It is a perspective view when the base material sheet concerning the present invention is cross-stopped. It is a perspective view when the conventional base material sheet is cross-stopped.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In addition, in the state which developed the disposable diaper which concerns on this invention, the surface near a wearer is called an "inner surface", and the surface far side is called an "outer surface." Further, the side closer to the wearer is referred to as “inner side”, and the far side is referred to as “outer side”.

  Moreover, regarding the base material sheet 8, the width direction outer side of the disposable diaper is referred to as “tip side” and the width direction center side is referred to as “base end side” in the state where the base material sheet 8 is unfolded.

  Moreover, regarding the base material sheet 8, the same direction as the longitudinal direction of the disposable diaper is referred to as the up-down direction.

  And regarding the base material sheet 8, in the state which developed the base material sheet 8, the up-down direction upper side is called "upper end side", and the up-down direction lower side is called "lower end side". Furthermore, the upper end side edge of the base sheet 8 is referred to as “upper end”, and the lower end side edge of the base sheet 8 is referred to as “lower end”.

(Diaper overall structure)
FIG. 1 shows a disposable diaper 200 according to the present invention. This disposable diaper 200 has a crotch part, and a ventral part F and a back part B extending on both front and rear sides thereof. The dimensions of each part can be determined as appropriate.

  The tape-type disposable diaper 200 according to the present embodiment has a structure in which the back sheet 1 is provided on the outer surface side, and the liquid-impermeable sheet 15, the absorber 3, and the top sheet 2 are laminated in order toward the inner surface side. ing. Although not shown, a second sheet 16 may be provided between the absorber 3 and the top sheet 2.

  In the present invention, the sheet on the side closest to the wearer's skin is referred to as the top sheet 2. The top sheet 2 is composed of a plurality of unit sheets.

  A liquid-impermeable sheet 15 is provided outside the absorber 3 so as to protrude slightly from the periphery of the absorber 3. The liquid-impermeable sheet 15 is preferably a sheet having a water barrier property, and besides a polyethylene film, a sheet having moisture permeability can be used without impairing the water barrier 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. Can be used.

  Further, the outer surface of the liquid-impermeable sheet 15 is covered with a back sheet 1 made of a non-woven fabric, and this back sheet 1 eats outside the periphery of the liquid-impermeable sheet 15 with a predetermined protrusion width. I'm out. As the back sheet 1, various nonwoven fabrics can be used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  As described above, the second sheet 16 may be provided on the inner surface of the absorber 3. The width of the second sheet 16 may be provided so that the absorber 3 partially protrudes from the side edge of the second sheet 16, or the width of the second sheet 16 is increased so that the side edge of the absorber 3 does not protrude. You can also As the second sheet 16, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. In the present invention, a form in which the second sheet 16 is omitted can be considered.

  Moreover, the front target tape 6 is provided along the width direction on the ventral surface of the diaper. The diaper is attached to the body by fixing the fixing means 5 described later to the front target tape 6.

(Substrate sheet)
Fastening base material sheet 8 is provided between back sheet 1 and top sheet 2 at both ends in the back side direction of disposable diaper 200. The base sheet 8 and the back sheet 1 or the top sheet 2 are bonded with a hot melt adhesive or the like. Note that the base sheet 8 is not necessarily provided between the back sheet 1 and the top sheet 2. Specifically, it may be provided on the outer surface side of the back sheet 1 or the inner surface side of the top sheet 2.

  The base sheet 8 is fixed to the diaper main body by a hot melt adhesion or the like. And it is provided so that it may extend toward the front end side from the base end side.

The base material sheet 8 can be formed by laminating a plurality of nonwoven fabrics NF, or can be formed by a single nonwoven fabric NF. As this nonwoven fabric NF, a known one can be used. As a raw material fiber constituting the nonwoven fabric NF, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. Moreover, as a processing method of nonwoven fabric NF, well-known methods, such as the spunlace method, the spunbond method, the SMS method, the thermal bond method, the melt blown method, the needle punch method, the air through method, the point bond method, can be used. In particular, a spunbond nonwoven fabric and an SMS nonwoven fabric using olefin fibers are preferable. The basis weight of the non-woven fabric NF to be used can be appropriately determined. However, since it needs to touch the wearer's skin and needs a certain strength, a high-weight non-woven fabric is desirable, preferably 50 to 100 g / m ² . It preferably has a basis weight.

(Protruding part)
At the front end side of the base sheet 8, at least two upper and lower projecting portions 12 projecting outward are formed. The projecting portion 12 may be formed by projecting the base sheet 8 itself outward, or a member separate from the base sheet 8 is prepared, and the base sheet is formed by hot melt or the like. It may be formed by being fixed to 8. When the protruding portion 12 is formed of a member separate from the base sheet 8, a non-woven fabric or an elastic elastic member can be used as the material. Examples of the elastic elastic member include materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester. As a nonwoven fabric, the raw material similar to the said base material sheet 8 can be used, for example. In addition, even if it is a case where the protrusion part 12 is formed using the member separate from the base material sheet 8, the protrusion part 12 is regarded as a part of the base material sheet 8, and this invention is demonstrated.

  The protruding portion 12 is composed of at least two upper and lower stages. Although three or more upper and lower protrusions 12 may be provided, the number of steps is preferably smaller in consideration of the ease of manufacture and the convenience at the time of mounting, and those having two upper and lower steps are particularly preferable. Between the upper protruding portion 12A and the lower protruding portion 12B, a portion where the both protruding portions 12A and 12B are separated (valley portion 13) is formed.

(Fixing means)
Fastening means 5 such as an adhesive layer 20 and a hook-and-loop fastener element 9 are provided on the inner surface of the protruding portion 12 or the inner surface of the base sheet 8 on the front end side. As the pressure-sensitive adhesive layer 20, for example, an acrylic adhesive mainly composed of a polyacrylate ester, a tackifier mainly composed of an elastic component of natural rubber or synthetic rubber, a plasticizer, A rubber adhesive or the like in which an anti-aging agent or the like is blended can be used. In addition, a hot melt adhesive or the like can also be used. Moreover, as the hook_and_loop | surface fastener element 9, the hook material and loop material of a hook_and_loop | surface fastener can be used.

  When the hook-and-loop fastener element 9 is provided as the fixing means 5, the front target tape 6 and the hook-and-loop fastener element 9 provided on the ventral surface of the diaper can be detachably fixed. For example, when the hook-and-loop fastener element 9 provided on the protruding portion 12 is a hook material, the front target tape 6 is a loop material. Further, when the hook-and-loop fastener element 9 provided on the protruding portion 12 is a loop material, the front target tape 6 is a hook material. As the protrusion shape of the hook material, a known shape can be used, and examples thereof include a bowl shape, a mushroom shape, and a complex shape.

  The peel strength between the hook-and-loop fastener element 9 and the front target tape 6 is preferably 300 to 800 gf.

(Folding line)
A fold line 17 is formed from the front end side to the base end side of the base sheet 8 between the upper and lower protrusions 12A and 12B. The fold line 17 is a mountain fold line that is folded with the inner surface of the base sheet 8 facing inward.

  The fold line 17 can be formed, for example, by adding a groove or an emboss to the base sheet 8. At this time, it is preferable to add a groove or an emboss from the inner surface side of the base sheet 8 so that the base sheet 8 is easily folded, so that a recess is formed on the inner surface side of the base sheet 8.

  In addition, the folding line 17 may be formed by providing a perforation with an interval (about 3 to 5 mm) that does not break. Moreover, you may form by opening several space | intervals (about 3-5 mm) of the grade which is not a perforation, and the through-holes, such as circular and an ellipse, are not fractured | ruptured.

  The fold line 17 formed in this way is lower in rigidity than the base sheet 8.

  The position where the fold line 17 is formed can be arbitrarily determined. For example, as shown in FIG. 2, the base sheet 8 is formed in the horizontal direction from the front end side edge to the base end side of the base sheet 8 between the upper and lower protrusions 12 </ b> A and 12 </ b> B with reference to the vertical direction of the base sheet 8. be able to. Further, it may be formed obliquely downward or obliquely upward.

  In addition, it can also be formed in the horizontal direction from the notch 11 portion described later toward the base end side with reference to the vertical direction of the base sheet 8. Moreover, you may form diagonally upward or diagonally downward.

  Further, when the bending line 17 is provided in a straight line, wrinkles are hardly generated. However, the present invention is not limited to this, and may be provided in a curved shape or a wave shape.

  By providing the fold line 17, the base sheet 8 is bent along the fold line 17, so that bending at an unintended location can be prevented. As a result, it is possible to prevent a part of the base material sheet 8 from overlapping several layers and the part from becoming extremely harder than the other parts.

  In addition to the above example, a plurality of folding lines 17 may be provided. By providing a plurality of folding lines 17, it is possible to arbitrarily adjust the folding position of the base sheet 8, and there is an advantage that the degree of freedom in the angle of folding is improved.

  When a plurality of the fold lines 17 are provided, it is preferable that the positions of the end portions on the base end side of the fold lines 17 are substantially the same, and the fold lines 17 are provided radially from there.

  Furthermore, as shown in FIG. 8, the end portion on the front end side of the fold line 17 may not be in contact with the front end side edge of the base sheet 8. For example, the distal end side end of the fold line 17 may be provided at a position spaced a predetermined distance from the distal end side edge of the base sheet 8 to the proximal end side.

(Cut)
A cut 11 is formed between the upper and lower protrusions 12A and 12B from the front end side to the base end side of the base sheet 8. As this notch 11, the form punched beforehand can be mentioned, for example. As other forms, perforations may be used, or a plurality of through-holes such as a circle and an ellipse may be opened at a predetermined interval. When a perforation or a through hole is provided, the customer cuts a portion (tie portion) between the cut portion and the cut portion that has already been cut in the product state, so that a continuous cut 11 is obtained.

  The position where the cut 11 is formed can be arbitrarily determined. For example, it can form in the horizontal direction from the front end side edge of the base material sheet 8 between the upper and lower protrusions 12A, 12B to the base end side with reference to the vertical direction of the base material sheet 8.

  In addition, when cross-stopping, if the lower protruding portion 12B is fixed before the upper protruding portion 12A, the fit of the crotch portion of the diaper is improved, and the body fluid leakage preventing effect is improved.

  Therefore, in the present invention, as shown in FIG. 2, the lower side of the base sheet 8 between the upper and lower protrusions 12 </ b> A and 12 </ b> B is obliquely downward from the leading edge of the base sheet 8 to the base side, as shown in FIG. 2. It is preferable to provide the notch 11 in. This makes it difficult for wrinkles to enter the base sheet 8 when the lower protrusion 12B is first fastened and cross-stopped.

  In addition, on the basis of the vertical direction of the base sheet 8, the base sheet 8 may be provided obliquely upward from the leading edge of the base sheet 8 between the upper and lower protrusions 12 </ b> A and 12 </ b> B toward the base end. By providing the notches 11 obliquely upward, wrinkles are unlikely to enter the base sheet 8 when the upper protrusion 12A is first fastened and cross-stopped.

  Moreover, it is preferable to make it the angle (alpha) between the said notch 11 and the bending line 17 to be in the range of 30 degrees-60 degrees.

  As shown in FIG. 6, the angle β formed by the upper protrusion 12 </ b> A and the lower protrusion 12 </ b> B when cross-stopping is preferably in the range of 60 ° to 120 ° for ease of cross-stopping. . When the upper projecting portion 12A and the lower projecting portion 12B are fixed at the angle of 60 ° to 120 °, the angle α between the notch 11 and the fold line 17 is within the range of 30 ° to 60 °. Thus, it is possible to make it difficult for wrinkles to enter the base sheet 8.

  In addition, the angle β formed by the upper protruding portion 12A and the lower protruding portion 12B when performing cross-stopping is from the viewpoint of ease of cross-stopping and difficulty of peeling of the fixed base sheet 8 (stability), More preferably, the angle is 90 °. Therefore, assuming that the upper protrusion 12A and the lower protrusion 12B are fixed at 90 °, the angle α between the notch 11 and the fold line 17 is set to 45 in order to make it difficult for wrinkles to enter the base sheet 8. More preferably, it is set to °.

  In addition, as shown in FIG. 7, the case where the front end side edge part of the said notch 11 and the front end side edge part of the bending line 17 are not touching is also considered. In this case, the angle α is measured with reference to the intersection of the virtual line 21 obtained by extending the cut line 11 and the bending line 17 respectively.

  Moreover, as shown in FIG. 2, the length n of the cut 11 is preferably as long as possible. This is because the degree of freedom of cross-stop increases by the length of the length n of the notch 11. On the other hand, when the length n of the notch 11 is short, the degree of freedom of crossing is reduced and the base sheet 8 is likely to be wrinkled. Therefore, the length n of the notch 11 is set to be more than half of the total length N when the notch 11 extends from the distal end side end portion to the base end side end portion and extends to the base sheet 8 base end portion. It is preferable.

  Furthermore, when the notch 11 is provided obliquely below and the base end side end of the notch 11 is close to the lower end of the base sheet 8, the base sheet 8 breaks starting from the base end, The base material sheet 8 is torn into two. In order to prevent this, it is necessary to secure a certain distance between the base end side end of the cut 11 and the lower end of the base sheet 8. Therefore, in the present invention, as shown in FIG. 2, the length m in the vertical direction of the notch 11 is set to a half or less of the length M1 between the end on the front end side and the lower end of the base sheet 8. It is preferable.

  In addition, when the cut 11 is provided obliquely upward, the distance between the base end side end of the cut 11 and the upper end of the base sheet 8 can be similarly considered. That is, it is preferable that the vertical length m of the notch 11 is not more than one half of the length M2 between the end on the front end side and the upper end of the base sheet 8.

  Further, in order to prevent the base sheet 8 from being broken, as shown in FIG. 3, a tear stopper 22 may be provided at the proximal end portion of the cut 11.

  Further, when the cut 11 is provided in a straight line, wrinkles are hardly generated. However, the present invention is not limited to this, and may be provided in a curved shape or a wave shape.

  Furthermore, as shown in FIG. 8, the end portion on the front end side of the cut 11 may not be in contact with the front end side edge of the base sheet 8. For example, the distal end side end of the notch 11 may be provided at a position spaced from the distal end side edge of the base sheet 8 to the proximal end side by a predetermined interval. At this time, if the distance between the leading edge of the base sheet 8 and the leading edge of the notch 11 becomes too long, the customer cannot cut this part by himself. Therefore, the length of this part is preferably within 10 mm.

  In addition to the above-described example, as shown in FIG. 3, the base sheet 8 is obliquely inclined from the front end side edge of the base sheet 8 between the upper and lower protrusions 12 </ b> A and 12 </ b> B to the base end side with reference to the vertical direction of the base sheet 8. While providing the notch 11 below, you may make it provide the notch 11 diagonally upward toward the base end side from the front end side edge of the base material sheet 8 between the up-and-down protrusion parts 12A and 12B. By providing the two cuts 11 in this way, even when the lower protrusion 12B is first fastened and cross-stopped, the upper protrusion 12A is fastened first and the cross-stop is fixed. Even when this is done, wrinkles are less likely to enter the base material sheet 8. In addition, the bending line 17 in the case of making the above cuts 11 can be provided in a substantially horizontal direction from the end of the cut 11 to the base end of the base sheet 8, for example.

  Moreover, as shown in FIG. 4, it cut | disconnects in the substantially horizontal direction toward the base end side from the front end side edge of the base material sheet 8 between the up-and-down protrusion parts 12A and 12B on the basis of the up-down direction of the base material sheet 8. 11 may be provided, and the notch 11 may be provided further obliquely downward from the base end portion of the notch 11 toward the base end side. By making such a notch 11, the degree of freedom of crossing is increased, and wrinkles are less likely to enter the base sheet 8. In addition, when such a cut | notch 11 is made | formed, for example, the substantially horizontal cut 11 can be comprised by the perforation, and the diagonally downward cut 11 can be comprised in the state pierced previously. Moreover, the fold line 17 in this case can be provided in the substantially horizontal direction from the base end of the notch | incision 11 put in the substantially horizontal direction to the base end side of the base material sheet 8, for example.

(Valley fold line)
When the crossing is stopped, a valley fold line 18 is generated from the base end side end portion of the fold line 17 or the extension line of the base end side end portion toward the middle portion or the base end portion of the cut 11 . The valley fold line 18 is a valley fold line that is folded with the inner surface of the base sheet 8 facing outward.

  The valley fold line 18 can be formed in advance in a portion where the base sheet 8 is predicted to be folded at the position of the fold line 17 and the base sheet 8 is folded.

  For example, when the cut 11 is provided obliquely downward from the front end side to the base end side of the base sheet 8, the valley fold line 18 is formed obliquely upward from the cut 11 toward the base end side. At this time, the triangular region surrounded by the fold line 17, the notch 11, and the valley fold line 18 is prevented from being folded into an unintended shape, and unnecessary wrinkles are unlikely to enter the base sheet 8.

  The valley fold line 18 can be formed, for example, by adding a groove or an emboss to the base sheet 8. At this time, a groove or emboss is added from the outer surface side of the base sheet 8 so that the base sheet 8 can be easily folded, so that a recess is formed on the inner surface side of the base sheet 8.

  In addition, the valley fold line 18 may be formed by providing a perforation having an interval (about 3 to 5 mm) that does not break. Moreover, you may form by opening several space | intervals (about 3-5 mm) of the grade which is not a perforation, and the through-holes, such as circular and an ellipse, are not fractured | ruptured.

  The fold line 18 formed in this way is lower in rigidity than the base sheet 8.

  Note that there is a possibility that the base sheet 8 is folded at a portion different from the mountain fold line 17 by the consumer's judgment. In such a case, the valley is folded at a portion different from the valley folding line 18 provided in advance. In this case, the portion where the consumer actually folds the valley is also called the valley fold line 18.

(Elastic elastic member of base sheet)
As shown in FIG. 5, an elastic elastic member 14 may be provided at the distal end portion of the base sheet 8 from the distal end side to the proximal end side of the base sheet 8. By providing the elastic expansion / contraction member 14, the tip end portion of the base sheet 8 expands and contracts, and therefore, when cross-stopping, the upper protruding portion 12A or the lower protruding portion 12B is pulled inward in the width direction of the diaper. Can be fastened. And even if it is a case where it fixes at such a position, a wrinkle becomes difficult to enter into the base material sheet 8. FIG.

  This elastic expansion / contraction member 14 is fixed to the inner surface or outer surface of the base sheet 8 in a stretched state by a hot melt adhesive or the like. Examples of the elastic elastic member 14 include styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc. Commonly used materials can be used.

(Production method)
In the manufacture of the base sheet 8 according to the present invention, in order to reduce waste members, the shape of the separating portion 13 between the upper and lower protruding portions 12A and 12B and the shape of the protruding portion 12 are axisymmetric. It is preferable to do this.

  And the manufacturing process of this base material sheet 8 first pays out the base material sheet 8 of a predetermined width, and adheres the hook-and-loop fastener element 9 continuously to the center position. At this time, an adhesive layer 20 may be applied instead of the hook-and-loop fastener element 9. Then, the hook-and-loop fastener elements 9 or the adhesive layer 20 are alternately cut across a continuous wavy curve. At the same time, a cutting line for dividing the base material sheet 8 is entered, and a cut 11 is made at a predetermined position for each base material sheet 8. Thereafter, the folding line 17 is provided at a predetermined position.

  DESCRIPTION OF SYMBOLS 1 ... Back sheet, 2 ... Top sheet, 3 ... Absorber, 4 ... Barrier sheet, 5 ... Fastening means, 6 ... Front target tape, 7 ... Threaded elastic elastic member (of diaper main body), 8 ... Base material sheet, DESCRIPTION OF SYMBOLS 9 ... Hook fastener element, 10 ... Extension line, 11 ... Notch, 12 ... Projection part, 12A ... Upper projection part, 12B ... Lower projection part, 13 ... Valley part, 14 ... Elastic expansion / contraction (of base sheet) 15: liquid impervious sheet, 16: second sheet, 17: fold line, 18: valley fold line, 19: rising part, 20: adhesive layer, 21: imaginary line, 22: tear-off, F: belly Side portion, B: Dorsal side portion, m: Length of cut in the vertical direction, M1: Length between the end portion on the front end side and the lower end of the base sheet, M2: End portion on the front end side and the upper end of the base sheet , N ... the length of the notch, N ... the notch at the tip Total length when extending from the end portion to the base end portion of the base sheet, EF ... End flap portion, SF ... Side flap portion, α ... An angle between the cut and the fold line, β ... Angle between upper and lower protrusions

Claims (5)

A fastening base sheet that protrudes outward is provided on both sides of the back side of the diaper, and at least two upper and lower protrusions that protrude outward from the base sheet are formed, and the inner surface of the protrusion The disposable diaper is provided with fastening means including an adhesive layer or a hook-and-loop fastener element, and fastens the base sheet to the ventral outer surface of the diaper via the fastening means,
In between the upper and lower protrusions, mountain fold line is formed in a substantially horizontal direction toward the proximal side from the distal end of the base sheet,
A notch is formed obliquely from the distal end side end of the mountain fold line or an extension line to the distal end side toward the proximal end side,
A disposable diaper characterized in that a valley fold line is formed from a base end side end portion of the mountain fold line or an extension line to the base end side toward an intermediate portion or base end side end portion of the cut . The notches are disposable diaper according to claim 1, wherein provided obliquely downward toward the base end side from the distal end side of the base sheet. The slit is claim 1 or 2 disposable diaper according provided obliquely upward toward the proximal side from the distal end side of the base sheet. The disposable diaper according to any one of claims 1 to 3 , wherein an angle between the cut and the mountain fold line is in a range of 30 ° to 60 °. The disposable diaper of Claim 1 with which the elastic elastic member was provided in the front-end | tip part of the said base material sheet toward the base end side from the front end side of the said base material sheet.