JP2017063942A - Tape type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape type disposable diaper which is free from risks of tearing of a sheet base material constituting a fastening tape and the detachment of the fastening tape.SOLUTION: A tape type disposable diaper has a fastening tape 10 at both side end parts of a back side part B in a width direction, and the tape 10 has a sheet base material 11 and an engaging means 12 as components. The sheet base material 11 has a base part 11A and a projection part 11B. The projection part 11B is branched into an upper side projection piece 13 and a lower side projection piece 14. On both projection pieces 13, 14, an engaging means 12 capable of engaging with an abdominal side part is provided. The base part 11A has a joining region 21 which is substantially in a joined relation with the back side part B and a non-joining region 22 which is not in a joined relation substantially, and a prescribed length 11d below an upper side end edge 11x of the base part 11A is the non-joining region 22.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a tape-type disposable diaper provided with a fastening tape.

  At present, as a tape-type disposable diaper (hereinafter, also simply referred to as “disposable diaper”), a sheet base material and a locking means are provided as constituent elements at both ends in the width direction of the back side portion covering the back side of the wearer. Some have a fastening tape. This type of disposable diaper is mounted by turning the sheet base material from the back side of the wearer to the abdomen and locking the locking means to the abdomen portion covering the abdomen side of the wearer.

  In recent years, in this type of disposable diaper, a problem has been recognized that the fastening tape can be removed from the back side portion. Therefore, when joining the sheet base material constituting the fastening tape to the back side part, for example, by increasing the amount of adhesive applied, or by using multiple types of adhesives, the sheet base material for the back side part There have been proposals to increase the bonding strength of the above (Patent Document 1, Patent Document 2).

  However, the present inventors have found that even if the bonding strength is increased, the sheet base material is torn and eventually the fastening tape may be removed from the back side portion.

JP 2007-143633 A JP 2011-97975 A

  The main problem to be solved by the present invention is to propose a tape-type disposable diaper in which the sheet base material constituting the fastening tape is not torn and the fastening tape can be removed.

  The present inventors conducted a number of sample tests using the fastening tape 100 having the conventional joining structure shown in FIG.

  The fastening tape 100 includes a sheet base 111 and a locking unit 112 as main components. The sheet base material 111 can be identified as a root portion 111A that overlaps the back portion B and a protruding portion 111B that protrudes outward in the width direction from the back portion B. The root portion 111 </ b> A is joined to the back portion B in the joining region 121. The protruding portion 111B is branched into an upper protruding piece 113 and a lower protruding piece 114 on the tip side. The upper protruding piece 113 and the lower protruding piece 114 are each provided with a locking means 112. The locking means 112 can be locked to the ventral portion F, respectively.

  At the time of mounting or during mounting, the portion of the fastening tape 100 centered on the main body side tension portion 100B is pulled to one side by the back side portion B. On the other hand, the part of the fastening tape 100, particularly the tape-side tensile portion 100F, is pulled by the ventral-side portion F to the other (the direction facing the one). Therefore, according to what the present inventors have inferred, the fastening tape 100 is mainly subjected to a tensile force in the direction indicated by the virtual tensile direction line 111p.

  In addition, the present inventors conducted a number of sample tests on the disposable diaper provided with the fastening tape 100 using a tensile tester as described later. As a result, in the disposable diaper, it is found that the sheet base material 111 is easily torn at the portion indicated by reference numeral 100t, that is, at the longitudinal end portions of the joining region 121 and along the width direction outer edge 121y. did.

  Therefore, as a result of various studies based on the above estimation and knowledge, the following means for solving the above problems have been conceived. Further, in this process, the conclusion is reached that the same holds true for the type of fastening tape in which the leading end of the projecting portion 111B is not branched into the upper projecting piece 113 and the lower projecting piece 114. I have come up with further means to do this.

(Means 1)
A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
As for the said protrusion part, the front end side branches into the upper side protrusion piece and the lower side protrusion piece,
The upper protruding piece and the lower protruding piece are each provided with the locking means,
The locking means can be locked to the ventral portion, respectively.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the upper edge of the root portion to a lower portion of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that.

(Means 2)
A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
As for the said protrusion part, the front end side branches into the upper side protrusion piece and the lower side protrusion piece,
The upper protruding piece and the lower protruding piece are each provided with the locking means,
The locking means can be locked to the ventral portion, respectively.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the lower edge of the root to the upper part of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that.

(Means 3)
A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
The protrusion is provided with the locking means,
The locking means can be locked to the ventral portion.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the upper edge of the root portion to a lower portion of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that.

(Means 4)
A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
The protrusion is provided with the locking means,
The locking means can be locked to the ventral portion.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the lower edge of the root to the upper part of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that.

(Means 5)
The predetermined length is 2 to 30 mm.
The tape-type disposable diaper according to any one of the means 1 to 4.

(Means 6)
A joining reference point where the width direction outer edge and the upper edge of the joining region intersect, and a locking reference point where the width direction inner edge and the longitudinal virtual center line of the locking means provided in the upper protruding piece intersect. The virtual tensile direction line to be connected has a rotation angle of 5 to 60 ° with respect to the outer edge in the width direction of the joining region.
The tape-type disposable diaper of said means 1.

(Means 7)
A joining reference point where the width direction outer end edge and the lower end edge of the joining region intersect, and a locking reference point where the width direction inner end edge and the longitudinal virtual center line of the locking means provided in the lower protruding piece intersect. , A virtual tensile direction line connecting the two, has a rotation angle of 5 to 60 degrees with respect to the outer edge in the width direction of the joining region,
The tape-type disposable diaper of said means 2.

(Means 8)
An imaginary tensile direction line connecting a joining reference point where the outer edge in the width direction and the upper edge of the joining region intersect with an engagement reference point where the inner edge in the width direction and the longitudinal virtual center line of the engaging means intersect. Has a rotation angle of 5 to 60 ° with respect to the outer edge in the width direction of the joining region.
The tape-type disposable diaper of said means 3.

(Means 9)
A virtual pulling direction connecting a joining reference point where the width direction outer edge and the lower edge of the joining region intersect with a locking reference point where the width direction inner edge and the longitudinal virtual center line of the locking means intersect. The line has a rotation angle of 5 to 60 ° with respect to the outer edge in the width direction of the joining region.
The tape-type disposable diaper of said means 4.

(Means 10)
The upper edge of the width direction outer side end portion of the bonding region has a curved shape that swells upward as it goes inward in the width direction from the bonding reference point.
The tape-type disposable diaper of the means 1, the means 3, the means 6, or the means 8.

(Means 11)
The lower edge of the width direction outer end portion of the bonding region has a curved shape that swells downward as it goes inward in the width direction from the bonding reference point.
The tape-type disposable diaper of the means 2, the means 4, the means 7, or the means 9.

(Means 12)
The joining region is
A direct joining point which is a region where the back side part and the root part are joined;
It extends from this direct joint point to a predetermined range, and is composed of a joint influence point that is a region that is substantially in a joint relationship by reaching the joint force at the direct joint point,
The joining influence point constituting the outer peripheral edge of the joining region is an arrangement in which one joining influence point does not protrude beyond a predetermined distance from another joining influence point adjacent thereto.
The tape-type disposable diaper according to any one of the means 1 to 11.

(Means 13)
The predetermined range is a range of 1 mm or less from an outer peripheral edge of the joining reference point.
The tape-type disposable diaper of said means 12.

(Means 14)
The predetermined distance is 2 mm or less.
The tape-type disposable diaper of said means 12 or said means 13.

  According to this invention, it becomes a tape type disposable diaper which does not have a possibility that a fastening tape may be removed.

It is a top view which shows the inner surface of the deployment state of a disposable diaper. It is a top view which shows the outer surface of the deployment state of a disposable diaper. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a schematic diagram which shows the joining structure of the fastening tape of a 1st form. It is explanatory drawing of the tensile force added to the fastening tape of a 1st form. It is a schematic diagram which shows the joining structure of the fastening tape of a 2nd form. It is a schematic diagram which shows the joining structure of the fastening tape of a 3rd form. It is a schematic diagram which shows the joining structure of the fastening tape of a 4th form. It is explanatory drawing of the joining relation of the fastening tape of a 4th form. It is a schematic diagram which shows the modification of the joining structure of the fastening tape of the 1st-4th form. It is a schematic diagram which shows the joining structure of the fastening tape of a 5th form. It is a schematic diagram which shows the joining structure of the conventional fastening tape.

Next, modes for carrying out the invention will be described.
In the following, first, the overall structure, material, etc. of the tape-type disposable diaper provided with the fastening tape will be described, and then the embodiment examples of the fastening tape and the bonding structure of the fastening tape will be described.

(Definition)
In this specification, the definition is as follows.
The elongation rate means a value when the natural length is 100%. For example, the elongation rate when a natural length of 10 cm (such as an elastic member) is extended to 15 cm is 150%.
The vertical direction means a direction from the ventral side through the crotch toward the back side, or a direction from the back side through the crotch toward the ventral side. If necessary, it is also referred to as the front-rear direction or the longitudinal direction.
The width direction means a direction orthogonal to the vertical direction. If necessary, it is also called the horizontal direction.
The inner surface means a surface on the side in contact with the wearer's skin. If necessary, it is also called the upper surface, surface, or skin surface.
The back surface means a surface opposite to the inner surface. If necessary, it is also called the outer surface.

The inner side in the width direction means a direction approaching the center in the width direction of the disposable diaper. If necessary, it is also referred to as the inner side in the width direction or simply inward.
The outward in the width direction means a direction away from the center in the width direction of the disposable diaper. If necessary, it is also referred to as the outside in the width direction or simply outside.
The upper side means the upper side of the disposable diaper in the wearing state. Therefore, it is the side that is proximal to the waist opening and, if necessary, also referred to as the upper side in the vertical direction, the upper side in the vertical direction, or simply the upper side.
The lower side means the lower side of the disposable diaper in the wearing state. Therefore, it is the side that is distal to the waist opening, and is also referred to as the lower side in the vertical direction, the lower side in the vertical direction, or simply the lower side as necessary.

(Overall structure)
As shown in FIGS. 1 to 4, the disposable diaper of the present embodiment includes a diaper main body 9 having a back side portion B covering the back side of the wearer and a ventral side portion F covering the abdominal side, and the width of the back side portion B. And a pair of fastening tapes 10 provided at both ends in the direction. The diaper body includes a liquid-permeable top sheet 1, a liquid-impermeable back sheet 2, an absorbent body 3 interposed between these 1 and 2, and an exterior sheet that covers the entire back surface of the back sheet 2. 4 and. In addition, between the back side part B and the abdominal side part F of the diaper main body 9, the crotch part C is located.

(Top sheet)
The top sheet 1 is liquid permeable and extends outward (outside) from the outer peripheral edge of the absorber 3. In the top sheet 1, portions extending outward from both side edges of the absorbent body 3 are joined to the back sheet 2 by an adhesive such as hot melt.

  As the top sheet 1, for example, a perforated or non-porous nonwoven fabric, a perforated plastic sheet, or the like can be used. As non-woven fabric fibers, for example, synthetic fibers based on olefins such as polyethylene or polypropylene, polyesters, amides, etc., recycled fibers such as rayon or cupra, natural fibers such as cotton, etc. can be used. . As a processing method of the nonwoven fabric, a known processing method such as a spunlace method, a spunbond method, an SMS method, a thermal bond method, a melt blown method, a needle punch method, an air-through method, or a point bond method can be employed.

The fiber basis weight of the top sheet 1 is preferably 15 to 30 g / m ² . The thickness of the top sheet 1 is preferably 0.05 to 1 mm.

(Back sheet)
The backsheet 2 is liquid-impermeable and extends outward from the outer peripheral edge of the absorber 3. In the back sheet 2, portions extending outward from both side edges of the absorbent body 3 are joined to the top sheet 1 and a three-dimensional gather sheet 5 described later by an adhesive such as hot melt.

  The back sheet 2 has a function of preventing movement (passing through) of excrement and excretion fluid absorbed by the absorber 3 to the back side. Therefore, as the back sheet 2, it is preferable to use a liquid-impermeable plastic film such as a polyethylene film. However, in consideration of prevention of stuffiness, it is more preferable to use a sheet having water shielding properties (liquid impermeability) and moisture permeability. As a sheet having water shielding properties and moisture permeability, for example, a microporous sheet can be used. The microporous sheet can be obtained, for example, by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and further stretching in a uniaxial or biaxial direction.

Mass per unit area of the backsheet 2 is preferably from 13~40g / m ^2. The thickness of the backsheet 2 is preferably 0.01 to 0.1 mm.

(Absorber)
The absorber 3 is a member that absorbs excrement, excretion fluid, and the like, and extends from the front side (abdominal side) to the rear side (back side) of the crotch portion C. Although the absorber 3 in the illustrated example has an hourglass shape, it may be rectangular, for example. Moreover, although the absorber 3 of the example of illustration is a single layer structure, it can also be set as the multilayer structure formed by laminating | stacking the absorber of 2 layers which consists of a lower layer absorber and an upper layer absorber, or three or more layers. However, the thickness of the absorber 3 is preferably 1 to 15 mm as a whole. The absorbent body 3 can be wrapped with a packaging material such as crepe paper if necessary.

  As the absorbent body 3, it is possible to use, for example, a pulp fiber stack, an aggregate of filaments such as cellulose acetate, a non-woven fabric, etc., and a mixture of a superabsorbent polymer and the like as necessary. it can.

The pulp basis weight of the absorbent body 3 is preferably 100 to 500 g / m ² . Moreover, it is preferable that the super absorbent polymer basis weight of the absorber 3 is 0 to 300 g / m ² . If the basis weight of the superabsorbent polymer is too small, sufficient absorption performance cannot be obtained. On the other hand, when the basis weight of the superabsorbent polymer is too much, the entanglement of the pulp fibers becomes weak, and twisting, cracking and the like are likely to occur.

(Exterior sheet)
The outer sheet 4 extends outward from both side edges of the top sheet 1 and the back sheet 2, and the outer peripheral edge of the outer sheet 4 coincides with the outer peripheral edge of the diaper main body 9. Due to the presence of the exterior sheet 4, the outer surface of the diaper main body 9 has a cloth-like appearance and feel.

  Although the nonwoven fabric similar to the top sheet 1 can also be used as the exterior sheet 4, it is preferable to use a spunbond nonwoven fabric.

  The exterior sheet 4 can be a multilayer sheet formed by laminating a plurality of sheets, or can be omitted after the shape of the back sheet 2 is appropriately changed.

The mass per unit area of the exterior sheet 4 is preferably 10 to 30 g / m ² . The thickness of the exterior sheet 4 is preferably 0.05 to 1 mm.

(Three-dimensional gather)
As shown in FIGS. 3 and 4, a three-dimensional gather RG is provided on each of the inner surface side and both end portions of the diaper main body 9. The three-dimensional gather RG has a function of preventing excrement and excretion fluid from leaking around the legs.

  The three-dimensional gather RG includes a three-dimensional gather sheet 5 formed by folding back the inner end in the width direction and an elongated elastic elastic member 5g interposed in the folded portion of the three-dimensional gather sheet 5.

  The width direction outer side edge part of the three-dimensional gather sheet 5 is joined to the exterior sheet 4, the sheet base material 11 of the fastening tape 10, which will be described later, the top sheet 1 and the like with an adhesive such as hot melt over the entire length in the front-rear direction. . Although the width direction inner side edge part of the three-dimensional gather sheet 5 is joined to the top sheet 1 by an adhesive such as hot melt with both front and rear direction end parts lying down, the front and rear direction center part is not joined to the top sheet 1. . Because of such a joining relationship, the three-dimensional gather RS has a widthwise inner end portion from the top sheet 1 at the center in the front-rear direction as indicated by a two-dot chain line in FIG. 4 due to the contraction force of the elastic elastic member 5g. Stand up.

  As the three-dimensional gather sheet 5, for example, a non-woven fabric (preferably a spunbonded non-woven fabric), a plastic film, a non-woven fabric and a laminated sheet of a plastic film can be used. However, from the viewpoint of touch, it is preferable to use a non-woven fabric that has been subjected to a water repellent treatment.

  The elastic expansion / contraction member 5g is fixed to the three-dimensional gather sheet 5 with an adhesive such as hot melt in an extended state in the front-rear direction. The elastic expansion / contraction member 5g has an elongated shape such as a thread shape, a string shape, or a belt shape, and is configured by a plurality having a predetermined interval. However, the elastic elastic member 5g may be constituted by one or a plurality of bundles may be constituted.

  As in this embodiment, when the elastic elastic member 5g is composed of a plurality of members, the number thereof is, for example, 2 to 10, preferably 3 to 8. Further, the arrangement interval is, for example, 2 to 15 mm, preferably 6 to 10 mm.

  In addition to natural rubber, the elastic elastic member 5g is, for example, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane rubber, polyethylene rubber, polystyrene rubber, styrene butadiene rubber, silicon rubber, It can be composed of synthetic rubber such as polyester rubber.

  The thickness of the elastic elastic member 5g is, for example, 500 to 1500 dtex, particularly 0.1 to 3 mm, preferably 0.5 to 3 mm in the case of natural rubber. Moreover, the elongation rate of the elastic elastic member 5g is, for example, 150 to 250%.

(Plane gathering)
As shown in FIG. 1, a flat gather HG is provided at both ends in the width direction of the diaper main body 9 and in the center in the front-rear direction. This flat gather HG has a function of improving the fit of the disposable diaper around the leg and preventing the excrement, excretion fluid and the like from leaking.

  As shown in FIG. 4, the planar gather HG includes a back sheet 2, an exterior sheet 4, and an elongated elastic elastic member 4 g interposed between these 2 and 4.

  The elastic elastic member 4g is fixed to the back sheet 2 or the exterior sheet 4 with an adhesive such as hot melt in a state of being stretched in the front-rear direction. The elastic expansion / contraction member 4g has an elongated shape such as a thread shape, a string shape, or a belt shape, and is composed of a plurality having a predetermined interval. However, the elastic elastic member 4g may be constituted by one or a plurality of bundles.

  As in the present embodiment, when the elastic elastic member 4g is composed of a plurality of members, the number is, for example, 2 to 10, preferably 3 to 8. Further, the arrangement interval is, for example, 2 to 15 mm, preferably 6 to 10 mm.

  The elastic elastic member 4g can be made of the same material as the elastic elastic member 5g described above, for example. The thickness of the elastic elastic member 4g is, for example, 500 to 1500 dtex, particularly 0.1 to 3 mm, preferably 0.5 to 3 mm in the case of natural rubber. The elongation percentage of the elastic elastic member 4g is, for example, 150 to 250%.

(Waist elastic part)
As shown in FIG. 1, a waist stretchable part WG is provided at the center in the width direction of the back part B (preferably near the back side edge). The waist stretchable part WG has a function of improving the fit of the disposable diaper around the waist.

  The waist elastic part WG includes the back sheet 2, the exterior sheet 4, and an elongated elastic elastic member 6 g interposed between these 2 and 4.

  The elastic elastic member 6g is fixed to the back sheet 2 or the exterior sheet 4 with an adhesive such as hot melt in a state of extending in the width direction. The elastic expansion / contraction member 6g has an elongated shape such as a thread shape, a string shape, or a belt shape, and is formed of a plurality having a predetermined interval. However, the elastic expansion / contraction member 6g may be constituted by one or a plurality of bundles may be constituted.

  As in this embodiment, when the elastic elastic member 6g is composed of a plurality of members, the number is, for example, 2 to 10, preferably 2 to 5. The arrangement interval is, for example, 2 to 15 mm, preferably 3 to 7 mm.

  The elastic elastic member 6g can be made of the same material as the elastic elastic member 5g described above, for example. The thickness of the elastic elastic member 6g is, for example, 500 to 1500 dtex, particularly 0.1 to 3 mm, preferably 0.5 to 3 mm in the case of natural rubber. The elongation rate of the elastic elastic member 6g is, for example, 150 to 250%.

  In this embodiment, the elastic stretchable member 6g is provided only in the center portion in the width direction, and the waist stretchable portion WG is formed only in the center portion in the width direction. However, the waist expansion / contraction part WG can be formed over the entire length in the width direction, or can be formed only at both ends in the width direction. Moreover, the elastic elastic member 6g can be interposed between the top sheet 1 and the back sheet 2, for example.

(Fastening tape)
Next, an example of the bonding tape 10 and the bonding structure of the fastening tape 10 to the back portion B will be described. In the description process, the front target tape 7 having a functional relationship with the fastening tape 10 will also be described.

  The fastening tape 10 is provided at both end portions of the diaper main body 9 and forms a pair on the left and right sides. Hereinafter, one fastening tape 10 will be described as an example, and the other fastening tape 10 will be described. Illustration is omitted. In this respect, the other fastening tape 10 preferably has the same structure as the one fastening tape 10 and is provided so as to be line-symmetric. However, the present invention is not limited to the case where the pair of left and right fastening tapes 10 have the same shape, joint structure, and the like.

(Form 1)
As shown in FIG. 5, the fastening tape 10 includes a sheet base material 11 and locking means 12 as constituent elements.

(Sheet base material)
The sheet base material 11 can be identified as a root portion 11A that overlaps the back portion B and a protrusion portion 11B that protrudes outward in the width direction from the back portion B. The root portion 11 </ b> A is joined to the back portion B in the joining region 21. The protruding portion 11 </ b> B is branched into an upper protruding piece 13 and a lower protruding piece 14 on the tip side (width direction outer side). The protruding portion 11B can be separated into a portion where the base end side (inner side in the width direction) continues to the upper protruding piece 13 and a portion continuous to the lower protruding piece 14 by a tear line 11c extending in the width direction. is there. The tear line 11c consists of a perforation line, a slit line, etc., for example. Locking means 12 are provided on the inner surfaces of the upper protruding piece 13 and the lower protruding piece 14 (each).

  As the sheet base material 11, for example, a water-repellent nonwoven fabric or the like can be used. Moreover, the fabric weight of the sheet | seat base material 11 is 20-120 g / m2, for example. The thickness of the sheet base material 11 is, for example, 0.1 to 1 mm. The tensile strength of the sheet base material 11 is, for example, 20 to 100 N / 25 mm. The sheet base material 11 having such physical properties is considered to be easily torn in the conventional form, but according to this form, the possibility of tearing is significantly reduced.

(Locking means)
The locking means 12 is constituted by a hook material having a plurality of hook-shaped protrusions on the surface (exposed surface). Examples of the hook material include mechanical fasteners (surface fasteners) such as Kuraray's Magic Tape (registered trademark), YKK Quicklon (registered trademark), Kanebo Bell Touch's Majikurosu (registered trademark), and the like. Male material can be used.

  As the locking means 12, an adhesive material can be used instead of the hook material if necessary.

  The locking means 12 is provided slightly on the inner side in the width direction (on the base portion 11A side), for example, 2 to 30 mm, slightly from the front end edges (outer end edges in the width direction) of the upper protruding pieces 13 and the lower protruding pieces 14. A portion located on the outer side in the width direction than the locking means 12 functions as a knob for picking when the fastening tape 10 is locked.

(Front target tape)
As shown in FIG. 2, the front target tape 7 is a band-like member extending in the width direction, and is joined to the surface of the exterior sheet 4 constituting the ventral portion F. The front target tape 7 is detachably engaged with the hook material described above. For example, the female material of the mechanical fastener described above can be used.

  The front target tape 7 can be omitted if necessary, and the locking means 12 made of a hook material can be engaged with the outer surface (exposed surface) of the exterior sheet 4 made of nonwoven fabric. When an adhesive material is used as the locking means 12, it is preferable to use a resin tape (sheet) having a smooth surface as the front target tape 7.

  When wearing the disposable diaper, the tearing line 11c is used to tear the protruding portion 11B of the sheet base material 11 as necessary, and then the locking means 12 is rotated from both sides of the wearer's waist to the ventral side. The locking means 12 turned to the ventral side is locked to the front target tape 7 provided on the ventral portion F, respectively.

(Joint structure)
As shown in FIG. 5, the root portion 11 </ b> A includes a joining region 21 that is substantially in a joining relationship with the back portion B and a non-joining region 22 that is not substantially in a joining relationship. Note that the meaning of “substantially” will be clarified in the description of Embodiment 4 to be described later.

  The outer peripheral edge of the joining region 21 is located on the inner side (center side) of the outer peripheral edge of the root portion 11A. In particular, the upper end edge 21x of the joining region 21 is located below the upper end edge 11x of the root portion 11A by a predetermined length 11d. doing. That is, the region from the upper edge 11x of the root portion 11A to the lower portion of the predetermined length 11d is the non-joining region 22.

  As described above, in the conventional joining structure of the fastening tape 100 (see FIG. 13), the sheet is formed in the longitudinal direction both ends of the joining region 121 and along the width direction outer edge 121y (part to be easily broken) 100t. The base material 111 was easy to tear. The easily tearable portion 100t has a line shape and intersects with the upper end 111x of the root portion 111A, which causes the fastening tape 100 to be removed. On the other hand, in this embodiment, the portion from the upper edge 11x of the root portion 11A to the lower portion of the predetermined length 11d is the non-joined region 22 and is easily torn (the longitudinal ends of the joint region 21 in the width direction). Since the portion 10t (the portion along the outer edge 21y) and the upper edge 11x of the root portion 11A do not intersect with each other, the possibility of the fastening tape 10 being removed is reduced.

  It should be noted that tearing of the sheet such as the sheet base material 11 is likely to occur at a portion where the tear strength changes, and the width direction outer edge 21 y of the joining region 21 defines the boundary between the joining region 21 and the non-joining region 22. Since this is a part where the tearing strength changes, the part 10t is easy to tear. However, in this embodiment, the non-joining region 22 exists above the width direction outer edge 21y of the joining region 21, and the portion 10t that is easily torn does not reach the upper edge 11x of the root portion 11A. ing.

  The predetermined length 11d that defines the range of the non-bonding region 22 is preferably 2 to 30 mm, more preferably 3 to 15 mm, and particularly preferably 5 to 15 mm. If the predetermined length 11d is too short, it is not possible to sufficiently prevent tearing from being easily generated at the upper end portion of the root portion 11A. On the other hand, if the predetermined length 11d is too long, the joining of the sheet base material 11 becomes insufficient.

However, the following problems may occur simply by setting the non-bonded region 22 up to the predetermined length 11d.
That is, as shown in (1) of FIG. 6, when a tensile force Pw is applied to the root portion 11A, the joint reference point 21z is near the upper edge 11x of the root portion 11A. Is applied. And since this rotational force Pc becomes large in proportion to leaving | separating from the joining reference point 21z, there exists a possibility that tear may arise along the vertical direction YD from the upper end edge 11x of the base part 11A. This tearing is not caused by the change in tearing strength along the outer edge 21y in the width direction of the joining region 21 as in the conventional joining structure, but is caused by the application of the rotational force Pc. It is what.

Therefore, in this embodiment, the rotation angle α is further regulated as follows.
That is, as shown in (2) of FIG. 6, the virtual tensile direction line 11p connecting the joining reference point 21z and the locking reference point 13z is 5-60 with respect to the width direction outer edge 21y of the joining region 21. It preferably has a rotation angle α of °, more preferably has a rotation angle α of 10-40 °, and particularly preferably has a rotation angle α of 15-30 °. When the rotation angle α is less than 5 °, the rotational force Pc becomes large. Therefore, particularly when the fastening tape 10 is used by tearing the protruding portion 11B at the tear line 11c, the rotational force Pc becomes large. The tearing from the upper end edge 11x of the root portion 11A is likely to occur. On the other hand, if the rotation angle α exceeds 60 °, it means that the predetermined length 11d is long, or that the locking means 12 is offset upward, and in the former case, the sheet base material 11 is joined. If the latter is insufficient, the fit may be reduced.

  The junction reference point 21z means a point (point) where the width direction outer edge 21y and the upper edge 21x of the junction region 21 intersect. The locking reference point 13z means a point (point) where the width direction inner edge 13y of the locking means 12 provided in the upper protruding piece 13 and the vertical virtual center line 13c intersect.

  As shown in FIG. 3, the sheet base material 11 is bonded to both the outer sheet 4 and the three-dimensional gathered sheet 5 to both 4 and 5, and this bonded portion constitutes a bonded region 21. However, the sheet substrate 11 can be bonded to the outer surface of the exterior sheet 4 or can be bonded to the inner surface of the three-dimensional gather sheet 5. In these cases, although the objects to which the sheet base material 11 is joined are different, the joining range, that is, the joining region 21 and the non-joining region 22 are the same as described above.

  The above is description of the non-joining area | region 22 located in the upper end part of 11 A of base parts, However, In this form, the same non-joining area | region 22 is provided also in the lower end part of 11 A of base parts. The non-joining region 22 at the lower end has a vertically symmetrical relationship with the non-joining region 22 at the upper end, has the same structure as the non-joining region 22 at the upper end, and the same principle applies. Therefore, explanation is omitted.

(Form 2)
In the form 1, the upper edge 21x of the joining region 21 was in a direct shape along the width direction XD over the entire range (full length). On the other hand, in this embodiment, as shown in FIG. 7, the upper end edge 21x of the outer end portion in the width direction of the joining region 21 is curved so as to swell upward as it goes inward in the width direction from the joining reference point 21z. It is. As described above, in the case of Form 1, when a tensile force Pw that pulls outward in the width direction is applied to the root portion 11A, a rotational force Pc about the joining reference point 21z is generated. However, in the case of Form 2, the force is not concentrated on one point (joining reference point 21z), and the force is dispersed. Therefore, tearing is difficult to occur. Even if tearing in the longitudinal direction YD occurs along the outer edge 21y in the width direction of the joining region 21, the tear is guided in the width direction XD along the upper edge 21x. Therefore, it is possible to prevent tearing from reaching the upper end edge 11x of the sheet base material 11 and the fastening tape 10 from being removed.

  On the other hand, the upper edge 21x of the inner end portion in the width direction of the bonding region 21 is not a curved shape that swells upward from the second bonding reference point 21w toward the outer side in the width direction, but a direct shape along the width direction XD. . In addition, the lower end edge of the joining region 21 has a direct shape along the width direction XD over the entire range (full length).

  The second joining reference point 21w means a point (point) where the width direction inner edge and the upper edge 21x of the joining region 21 intersect. Other structures are the same as those in the first embodiment.

(Form 3)
This form is an application form of form 2.
That is, first, as shown in FIG. 8, the upper end edge 21x of the outer end portion in the width direction of the bonding region 21 has a curved shape that swells upward from the bonding reference point 21z inward in the width direction. In addition, the upper edge 21x of the inner end portion in the width direction of the bonding region 21 is also in a curved shape that swells upward from the second bonding reference point 21w toward the outer side in the width direction. In the case of this form as well, as in the case of form 2, the force does not concentrate on one point (joining reference point 21z), and the force is dispersed. Therefore, tearing is difficult to occur. In addition, in the case of this form, since it is bilaterally symmetrical, unevenness or deviation of the adhesive used to form the bonding region 21 is difficult to occur. Therefore, the range of the joining area | region 21 can be controlled more correctly. Furthermore, even if tearing occurs along the upper end edge 21x of the joining region 21 from the joining reference point 21z side, the tearing is further lowered along the upper end edge 21x (lower edge side of the joining region 21). Be guided to. Therefore, it is possible to prevent tearing from proceeding upward and reaching the upper edge 11x of the sheet base material 11 to remove the fastening tape 10.

  In addition, the lower side edge of the joining area | region 21 is a direct shape along the width direction XD over the whole range (full length). Other structures are the same as those in the first embodiment.

(Form 4)
In the first to third embodiments, in the joining region 21, the sheet base material 11 is directly joined to the back portion B over the entire range by an adhesive such as hot melt or by welding with heat or ultrasonic waves. It was. On the other hand, in this embodiment, as shown in FIG. 9, the structure of the bonding region is different.

  That is, the joining region 21 extends from the direct joining point 23, which is the region where the back portion B and the root portion 11A are joined, to a predetermined range from the direct joining point 23, and the joining force at the direct joining point 23 extends. And a joining influence point 24 which is a region substantially in a joining relation.

  Here, the direct joining point 23 is a part where the back part B and the root part 11A are joined literally. On the other hand, the joining influence point 24 is a portion where the back side portion B and the root portion 11A are not joined, and formally corresponds to a non-joined region. However, the joining influence point 24 is a part located around the direct joining point 23, and from the viewpoint of easy tearing by the tensile force Pw (see FIG. 6), the joining force at the direct joining point 23 extends. It is. Therefore, the joining influence point 24 is substantially equal to the joining of the back portion B and the root portion 11A. Therefore, in the present invention, the joining influence point 24 is a region substantially in a joining relationship. Assume that the bonding region 21 is formed.

  The predetermined range 23d indicating the spread of the joining influence point 24 is determined by the joining method of the joining region 21, the joining object, the material of the sheet base material 11 and the back portion B, and the like, but in this embodiment, the joining reference point 23 is used. It is the range below 1 mm from the outer periphery.

  The direct joining points 23 are arranged in a straight line in the vertical direction YD and the width direction XD, but can be arranged in a zigzag manner as appropriate. However, with reference to FIG. 10, the joining influence point 24 constituting the outer peripheral edge 23e of the joining region 21 is such that one joining influence point 24A has a predetermined distance 24d from another joining influence point 24B adjacent thereto. It is preferable not to protrude beyond. When protruding beyond the predetermined distance 24d, tearing is likely to occur at the one joining influence point 24A.

  The predetermined distance 24d indicating the limit of the protrusion of the joining influence point 24 is determined by the joining method of the joining region 21, the joining object, the material of the sheet base material 11 and the back portion B, and the like, but in this embodiment, 2 mm or less. It is.

  Although the shape of the direct joining point 23 and the joining influence point 24 of this form is a perfect circle shape, as shown to (2) of FIG. 10, it may be made into an elliptical shape, as shown to (3) of FIG. It can also be a square shape. In the case of an elliptical shape or a rectangular shape, in addition to a vertically long shape in the vertical direction YD as in the illustrated example, a long horizontally long shape in the width direction XD, a long slanted shape in the oblique direction, and the like can be used. What is necessary is just to design suitably so that the sheet | seat base material 11 may become difficult to tear after considering joining strength.

(Modification)
As a modified example of the first embodiment, the non-joining region 22 can be provided only in the upper end portion or only in the lower end portion of the root portion 11A. Specifically, as shown in FIG. 11 (1), the lower end edge of the joining region 21 is positioned above a predetermined length (11d) of the lower end edge of the root portion 11A, while the joining region 21 The upper edge 21x can be made to coincide with the upper edge 11x of the root portion 11A. Conversely, as shown in FIG. 11 (2), while the upper end edge 21x of the joining region 21 is positioned below a predetermined length (11d) of the upper end edge 11x of the root portion 11A, The end edge can be made to coincide with the lower end edge of the root portion 11A.

  As a modified example of Form 2, as shown in FIG. 11 (3), only the lower edge of the outer end portion in the width direction of the joining region 21 has a curved shape that swells downward toward the inner side in the width direction. You can also. In addition to this, as shown in (4) of FIG. 11, the upper edge 21x of the outer end portion in the width direction of the joining region 21 is also curved so as to swell upward as it goes inward in the width direction. You can also. In other words, in this embodiment, the outer end in the width direction of the joining region 21 is curved along with the upper and lower ends.

  As a modification of the form 3, as shown in FIG. 11 (5), the lower edge of the outer end portion in the width direction of the bonding region 21 has a curved shape that swells downward toward the inner side in the width direction, and is bonded. The lower edge of the inner end portion in the width direction of the region 21 may have a curved shape that swells downward as it goes outward in the width direction. In addition to this, as shown in (6) of FIG. 11, the upper edge 21x of the outer end portion in the width direction of the joining region 21 has a curved shape that swells upward toward the inner side in the width direction, and the joining region 21 The upper end edge 21x of the inner end portion in the width direction can be a curved shape that swells upward as it goes outward in the width direction. That is, in this form, all four corners of the joining region 21 are curved.

(Form 5)
In the above embodiment, the tip end side of the projecting portion 11B is branched into the upper projecting piece 13 and the lower projecting piece 14, but the projecting portion 11B in this embodiment is not branched on the tip side as shown in FIG. The overall shape is rectangular. Also in this embodiment, if the same principle as in the above embodiment is adopted, the fastening tape 10 is difficult to be removed.

  That is, the root portion 11 </ b> A includes a joining region 21 that is substantially in a joining relationship with the back portion B and a non-joining region 22 that is not substantially in a joining relationship with the back portion B. A region from the upper end edge 11x of the root portion 11A to a position below the predetermined length 11d is defined as a non-joining region 22. The effect by this structure is the same as that of the form which the front end side of the protrusion part 11B has branched.

  In the present embodiment, in addition to the above, the non-joining region 22 is also formed from the lower end edge of the root portion 11A to the upper portion of the predetermined length 11d. That is, the non-joining part 22 is provided in both the upper end part and lower end part of the root part 11A. However, the non-joining area | region 22 can also be provided only in the upper side edge part of 11 A of base parts, or can be provided only in a lower side edge part.

  In the case of this embodiment, the predetermined length 11d that defines the range of the non-bonded region 22 is preferably 2 to 30 mm, more preferably 3 to 15 mm, and particularly preferably 5 to 10 mm. If the predetermined length 11d is too short, it is not possible to sufficiently prevent tearing from being easily generated at the upper end portion and the lower end portion of the root portion 11A. On the other hand, if the predetermined length 11d is too long, the joining of the sheet base material 11 becomes insufficient.

The rotation angle α described above is as follows.
That is, the virtual tensile direction line connecting the joining reference point 21z and the locking reference point 12z preferably has a rotation angle of 5 to 60 ° with respect to the width direction outer edge 21y of the joining region 21. It is more preferable to have a rotation angle of 40 °, and it is particularly preferable to have a rotation angle of 15 to 30 °. When the rotation angle is less than 5 °, tearing from the upper end edge 11x of the root portion 11A is likely to occur. On the other hand, there is a possibility that the rotation angle exceeds 60 ° and the joining of the sheet base material 11 becomes insufficient, or the fitting property is lowered.

  Here, the locking reference point 12z means a point (point) where the widthwise inner edge of the locking means 12 and the vertical virtual center line 12c intersect.

  The above description is for the upper end portion of the bonding region 21, but the same applies to the lower end portion of the bonding region 21.

Examples will be described below.
A tensile test using a tensile tester was performed using the above-described form 1 (FIG. 5) as an example and the conventional form (FIG. 13) as a comparative example. Hold the vicinity of the locking means (12, 112) with the upper chuck of the tensile tester, and the diaper body (9) with the lower chuck (the upper chucked point and the joining reference point (the lower edge and the outer edge in the width direction of the joining area) The test was carried out with a head speed of 500 mm / min. The distance between the upper and lower chucks was 150 mm. The basis weight of the sheet base material (11, 111) was 40 gsm, and the tensile strength in the width direction was 23.990 N / 25 mm. Furthermore, the predetermined length (11d) of Form 1 was 10 mm. Table 1 shows the locations torn and the tensile strength (N) at the time of tearing.

  As apparent from Table 1, the tensile strength was greatly improved by providing the non-joining region below the joining region.

  The present invention can be used as a tape-type disposable diaper provided with a fastening tape.

  DESCRIPTION OF SYMBOLS 1 ... Top sheet, 2 ... Back sheet, 3 ... Absorber, 4 ... Exterior sheet, 4g ... Elastic elastic member, 5 ... Solid gathering sheet, 5g ... Elastic elastic member, 7 ... Front target tape, 9 ... Diaper main body, 10 ... fastening tape, 10t ... easy to tear part, 11 ... sheet base material, 11A ... root part, 11B ... protruding part, 11c ... tearing line, 11d ... predetermined length, 11p ... virtual tensile direction line, 11x ... upper edge, 12 ... locking means, 12z ... locking reference point, 13 ... upper protruding piece, 13c ... longitudinal virtual center line, 13z ... locking reference point, 14 ... lower protruding piece, 100 ... fastening tape, 21 ... joining region, 21x ... upper edge, 21y ... outer edge, 21w ... second joining reference point, 21z ... joining reference point, 22 ... non-joining region, 23 ... direct joining point, 23e ... outer periphery, 23d ... predetermined range, 24 Bonding influence point, 24A ... One joining influence point, 24B ... Other joining influence points, 24d ... Predetermined distance, 100B ... Main body side tensile portion, 100F ... Tape side tensile portion, 100t ... Easy to tear, 111 ... Sheet base 111A ... root portion, 111B ... projecting portion, 111p ... virtual tension direction line, 111x ... upper edge, 112 ... locking means, 113 ... upper projecting piece, 114 ... lower projecting piece, 121 ... joining region, 121x ... upper edge, 121y ... width direction outer edge, B ... dorsal part, C ... crotch part, F ... ventral part, HG ... flat gather, Pc ... rotational force, Pw ... tensile force, RG ... solid gather, WG: Waist stretchable part, XD: Width direction, YD: Longitudinal direction, α: Rotation angle.

Claims (14)

A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
As for the said protrusion part, the front end side branches into the upper side protrusion piece and the lower side protrusion piece,
The upper protruding piece and the lower protruding piece are each provided with the locking means,
The locking means can be locked to the ventral portion, respectively.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the upper edge of the root portion to a lower portion of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that. A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
As for the said protrusion part, the front end side branches into the upper side protrusion piece and the lower side protrusion piece,
The upper protruding piece and the lower protruding piece are each provided with the locking means,
The locking means can be locked to the ventral portion, respectively.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the lower edge of the root to the upper part of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that. A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
The protrusion is provided with the locking means,
The locking means can be locked to the ventral portion.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the upper edge of the root portion to a lower portion of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that. A diaper main body having a dorsal side portion covering the back side of the wearer and a ventral side portion covering the ventral side, and a fastening tape provided at both end portions in the width direction of the dorsal side portion,
The fastening tape includes a sheet base material and a locking means as constituent elements,
The sheet base material has a root portion that overlaps the back side portion, and a protruding portion that protrudes outward in the width direction from the back side portion,
The protrusion is provided with the locking means,
The locking means can be locked to the ventral portion.
It is a tape type disposable diaper,
The root portion has a joining region that is substantially in a joining relationship with the dorsal portion, and a non-joining region that is not substantially in a joining relationship with the dorsal portion,
From the lower edge of the root to the upper part of the predetermined length is the non-joining region,
A tape-type disposable diaper characterized by that. The predetermined length is 2 to 30 mm.
The tape-type disposable diaper of any one of Claims 1-4. A joining reference point where the width direction outer edge and the upper edge of the joining region intersect, and a locking reference point where the width direction inner edge and the longitudinal virtual center line of the locking means provided in the upper protruding piece intersect. The virtual tensile direction line to be connected has a rotation angle of 5 to 60 ° with respect to the outer edge in the width direction of the joining region.
The tape-type disposable diaper according to claim 1. A joining reference point where the width direction outer end edge and the lower end edge of the joining region intersect, and a locking reference point where the width direction inner end edge and the longitudinal virtual center line of the locking means provided in the lower protruding piece intersect. , A virtual tensile direction line connecting the two, has a rotation angle of 5 to 60 degrees with respect to the outer edge in the width direction of the joining region,
The tape-type disposable diaper according to claim 2. An imaginary tensile direction line connecting a joining reference point where the outer edge in the width direction and the upper edge of the joining region intersect with an engagement reference point where the inner edge in the width direction and the longitudinal virtual center line of the engaging means intersect. Has a rotation angle of 5 to 60 ° with respect to the outer edge in the width direction of the joining region.
The tape-type disposable diaper according to claim 3. A virtual pulling direction connecting a joining reference point where the width direction outer edge and the lower edge of the joining region intersect with a locking reference point where the width direction inner edge and the longitudinal virtual center line of the locking means intersect. The line has a rotation angle of 5 to 60 ° with respect to the outer edge in the width direction of the joining region.
The tape-type disposable diaper according to claim 4. The upper edge of the width direction outer side end portion of the bonding region has a curved shape that swells upward as it goes inward in the width direction from the bonding reference point.
The tape-type disposable diaper according to claim 1, claim 3, claim 6, or claim 8. The lower edge of the width direction outer end portion of the bonding region has a curved shape that swells downward as it goes inward in the width direction from the bonding reference point.
The tape-type disposable diaper according to claim 2, claim 4, claim 7, or claim 9. The joining region is
A direct joining point which is a region where the back side part and the root part are joined;
It extends from this direct joint point to a predetermined range, and is composed of a joint influence point that is a region that is substantially in a joint relationship by reaching the joint force at the direct joint point,
The joining influence point constituting the outer peripheral edge of the joining region is an arrangement in which one joining influence point does not protrude beyond a predetermined distance from another joining influence point adjacent thereto.
The tape type disposable diaper of any one of Claims 1-11. The predetermined range is a range of 1 mm or less from an outer peripheral edge of the joining reference point.
The tape-type disposable diaper according to claim 12. The predetermined distance is 2 mm or less.
The tape-type disposable diaper according to claim 12 or claim 13.

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