JP2011182860A - Securing type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a securing type disposable diaper which can be easily and quickly unfolded from a folded product state. <P>SOLUTION: In the securing type disposable diaper, the back side folded back parts 20 are formed by folding backward both the side parts of the back side part B in a diaper inner face side even number times, the back side locking parts 13B are arranged in the upper face of the back side folded back parts 20 located at the uppermost part, the disposable diaper is folded into two making the center in a fore and aft direction as the folding line such that the inner face of the abdomen side part F and the inner face of the back side part B are joined, the back side locking parts 13B of the back side part B are peelably locked to the inner face of the abdominal side part F. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stationary disposable diaper that is worn by connecting a ventral part and a dorsal part.

FIGS. 11 to 14 show a so-called fastening type (generally called a tape type) disposable diaper extending along the center in the width direction so as to cover the lower abdomen and the crotch part to the buttocks. Absorbent main body part which is an existing part and is a part in which an absorbent body 56 is interposed between the liquid-permeable top sheet 30 forming the body-side surface and the liquid-impermeable sheet 11 located on the outer surface side 10 and a side flap portion SF that is a portion that extends to the left and right sides of the absorbent main body 10 and that does not have an absorbent element. Fastening tapes 14 projecting laterally are respectively provided on the side flap portions SF of the back portion B, and the fastening tape 14 is attached to the outer surface of the ventral portion F for mounting.
Disposable diapers are generally packaged in large numbers in a state of being individually compactly folded and sold as products. In the case of a fastening type disposable diaper, as shown in FIG. 15, the protruding portions of both fastening tapes 14 are folded back to the inner surface side of the mounting portion, temporarily fixed to the inner surfaces of both side flap portions SF, and further, the both side flap portions SF are absorbed. In a state of being folded back onto the main body 10, a large number of pieces are stacked and packaged in a state of being folded in two so that the inner surface of the ventral portion F and the inner surface of the dorsal portion B are aligned with the center in the front-rear direction as a fold. The form is common. In addition, a novel folding form considering compactness and the like has also been proposed (Patent Document 1).

JP 2007-185270 A

However, in the conventional folded configuration, the waist part of the ventral part and the waist part of the dorsal part of the diaper folded in the first half are gripped, the gripped parts are opened apart, and then the diaper of the dorsal part is then opened. A two-step operation of opening the fastening tape temporarily fixed to the inner surface is necessary, and a quick diaper changing operation is difficult. It is the psychology of the exchanger (mother) that wants to change the diaper as quickly as possible so that the child's mood does not worsen, and it is desirable to shorten and simplify the time for opening the diaper.
Then, the main subject of this invention is providing the fastening type disposable diaper which can be opened easily and rapidly from a folded product state.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A ventral part extending to the front side relative to the front-rear direction center, and a dorsal part extending to the rear side relative to the front-rear direction center;
A liquid-permeable top sheet forming a body-side surface, a liquid-impermeable sheet located on the outer surface side, and an absorbent body interposed therebetween,
A dorsal locking portion provided on both sides of the dorsal portion,
In a fastening type disposable diaper that is worn by locking both dorsal side locking parts to the ventral side part,
Both side portions of the back side portion are folded back evenly on the inner surface side of the diaper to form a back side folded portion, and the back side locking portion is provided on the upper surface of the uppermost back side folded portion,
Folded in half so that the inner surface of the ventral part and the inner surface of the dorsal part are combined with the center in the front-rear direction as a crease, the dorsal locking portion of the dorsal part is releasably locked to the inner surface of the ventral part Yes,
Fastening type disposable diaper characterized by that.

(Function and effect)
When opening a disposable diaper folded in this way, grasping the waist part of the ventral part and the waist part of the dorsal part of the folded diaper and opening the gripped part apart, the dorsal side After the folded portion is pulled and opened by the ventral portion, the dorsal locking portion is peeled from the ventral portion, and the temporary fixing is released. That is, the work of opening the product-folded diaper can be completed with only a simple one-step work of opening the folded portion.
Also, open the diaper halfway so that the dorsal locking part does not peel from the ventral part, put it on like a pants-type disposable diaper, and then peel the dorsal locking part on the left and right sides from the ventral part. It is also possible to adjust the waistline size.

<Invention of Claim 2>
Elastic stretchable members extending along the front-rear direction are provided on the outer side in the width direction than both side edges of the absorber and on the center side in the width direction than the back side locking portion, respectively.
Both side portions of the back side portion are folded back to the center in the width direction by first folds passing between both side edges of the absorber and the elastic elastic member, and then the elastic elastic member and the back side engagement Folded back outward in the width direction at a second fold passing between the two parts,
The fastening type disposable diaper according to claim 1.

(Function and effect)
By setting the absorber, the elastic elastic member, the locking portion, and the crease in such a positional relationship, it is easy to fold at the time of manufacturing, and the folded shape is easily maintained.

<Invention of Claim 3>
The both sides of the outer surface of the ventral part are provided with ventral locking parts that are locked with the inner surfaces of both sides of the back part, respectively.
Both sides of the ventral part are folded together with both sides of the dorsal part to form a ventral folded part, and the ventral locking part is provided on the lower surface of the uppermost ventral folded part As well as
Folded in half so that the inner surface of the ventral part and the inner surface of the dorsal part are combined with the center in the front-rear direction as the crease,
The ventral side locking portion is separably locked to a surface facing the lower surface of the uppermost ventral side folded portion,
The dorsal locking portion of the dorsal side portion is releasably locked to the upper surface of the uppermost ventral side folded portion, and the locking force of the dorsal side locking portion with respect to the ventral side folded portion is Stronger than the locking force of the ventral side locking portion against the opposing surface,
The fastening type disposable diaper according to claim 1 or 2.

(Function and effect)
By providing the ventral side locking portion in this manner, the abdominal side portion and the back side portion can be more firmly connected during mounting compared to the case where only the back side locking portion is provided. However, simply providing the ventral side locking portion may hinder the opening of the diaper in one step. Therefore, as described above, the both side portions of the ventral side portion are integrated with the both side portions of the back side portion. It is preferable to devise such as forming an abdominal side folded portion by folding back and forming a ventral side locking portion on the lower surface of the uppermost ventral side folded portion.
In this case, gripping the waist part of the ventral part and the waist part of the dorsal part of the folded diaper, and opening the gripped part apart, the dorsal folded part and the ventral folded part are mutually Since the locking force of the dorsal side locking portion with respect to the ventral side folded portion is stronger than the locking force with respect to the counter surface of the ventral side locking portion, The stop is released first, and then the dorsal locking part is peeled off from the ventral part. That is, also in this case, the operation of opening the product-folded diaper can be completed with only a simple one-step operation of opening the folded portion.

  As described above, according to the present invention, it is possible to easily and quickly open from the folded product state.

It is a top view in the state where the diaper was developed showing the inner surface of a fixation type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a fixation type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 1. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 1. FIG. 9 is a sectional view taken along line 9-9 in FIG. 1. It is a perspective view which shows a folded product state. It is a perspective view which shows the middle state at the time of opening a diaper. It is a perspective view of a diaper wearing state. It is a waist side end elevation showing a folded state in the case of a general fastening type disposable diaper. It is a top view in the state where the diaper was developed showing the inner surface of a general fixed type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a general fixed type disposable diaper. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is the 7-7 sectional view taken on the line of FIG. It is a waist side end elevation showing a conventional folded state.

  Hereinafter, although the example of a fastening type disposable diaper is drawn and explained about an embodiment of the present invention, it cannot be overemphasized that the present invention is applicable also to other types of disposable diapers, such as a pants type. In the following description, “front-rear direction (vertical direction)” means a direction connecting the ventral side (front side) and back side (rear side), and “width direction” means a direction (left-right direction) perpendicular to the front-rear direction. "Vertical direction" means the width when the diaper is folded in two at the crotch so that the abdomen side and both sides of the diaper overlap each other. It means the direction orthogonal to the direction.

  1-7 has shown an example of the fixation type disposable diaper. 3 and 4 are views showing a cross section taken along line 6-6 and 7-7 in FIG. 1, respectively, and FIGS. 5 and 6 are cross sections taken along line 8-8 and 9-9 in FIG. FIG. This fastening type disposable diaper is a part that extends from the lower abdomen along the center in the width direction through the crotch to cover the buttocks, and forms a body-side surface, and a liquid-permeable surface sheet 30; The absorbent main body 10 is a portion where the absorber 56 is interposed between the liquid-impermeable sheet 11 located on the outer surface side, and the portions extending to the front side and the rear side of the absorbent main body portion 10 respectively. And the abdomen end flap part FE and the back end flap part BE, which are parts that do not have the absorber 56, and parts that extend to the left and right sides of the absorbent main body part 10, respectively, And a side flap portion SF that is a portion that is not provided.

  In the absorbent main body 10, a liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot-melt adhesive, and the absorbent element 50, The intermediate sheet 40 and the top sheet 30 are laminated in this order. The top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have a slightly larger dimension in the front-rear direction and the width direction than the absorbent element 50, and are eaten from the side edges of the absorbent element 50 in the top sheet 30. The peripheral edge that protrudes and the peripheral edge that protrudes from the side edge of the absorbent element 50 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like. The liquid-impermeable sheet 11 is made of a moisture-permeable polyethylene film or the like, and is formed to be slightly wider than the top sheet 30. Furthermore, solid gathers 60 and 60 are provided on both sides of the absorbent main body 10 so as to protrude (stand up) toward the wearer's skin.

Hereinafter, each part will be described in detail.
(Exterior sheet)
The exterior sheet 12 has an hourglass shape in which the center part in the front-rear direction on both sides is constricted, and this is a part into which the wearer's leg is placed. The exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto. The type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like. When using a nonwoven fabric, the fabric weight is preferably 10 to 50 g / m ² , particularly 15 to 30 g / m ² .

(Liquid impervious sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited. For example, the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film. Non-woven fabrics that ensure liquid impermeability (in this case, liquid impervious sheets are composed of waterproof films and non-woven fabrics). Of course, in addition to this, a liquid-impermeable and moisture-permeable material that has been used and used in recent years from the viewpoint of preventing stuffiness can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.

(Surface sheet)
The top sheet 30 is sufficient if it has liquid permeability, and for example, a porous or non-porous nonwoven fabric or a porous plastic sheet can be used. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, the spun lace method is a preferable processing method for obtaining flexibility and drapeability, and the thermal bond method is for obtaining bulkiness and softness.

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Intermediate sheet)
An intermediate sheet (also referred to as a second sheet) 40 can be provided between the surface sheet 30 and the absorbent element 50 in order to move excrement that has passed through the surface sheet 30 to the absorber and prevent reversal. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the excrement to the absorber, but also prevents the excretion of the absorbed excrement from reversing from the absorber, and the surface of the top sheet 30 has a good touch. To do. The intermediate sheet 40 can be omitted.

  As the intermediate sheet 40, the same material as that of the top sheet 30 can be used. The intermediate sheet 40 is preferably bonded to the top sheet 30. When heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 40 preferably has a melting point similar to that of the top sheet 30. Further, considering the permeation of the solid content in the stool, the fineness of the fiber used for the intermediate sheet 40 is preferably 5.0 to 7.0 dtex, but the liquid residue in the top sheet 30 increases. On the other hand, when the fineness of the fiber used for the intermediate sheet 40 is 1.0 to 2.0 dtex, the liquid residue of the top sheet 30 is hardly generated, but the solid content of the stool is hardly transmitted. Therefore, it is preferable that the fiber of the nonwoven fabric used for the intermediate sheet 40 has a fineness of about 2.0 to 5.0 dtex.

  The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent element 50, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

(Three-dimensional gather)
In order to prevent urine and soft stool that move in the lateral direction along the top sheet 30 and prevent side leakage, the three-dimensional gathers 60, 60 that protrude (stand up) on the use surface side are provided on both sides of the product. preferable.

  The three-dimensional gather 60 includes a barrier sheet 62 that is substantially continuous in the width direction, and an elongated elastic elastic member 63 that is fixed to the barrier sheet 62 in a stretched state along the front-rear direction. As the barrier sheet 62, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 63, thread rubber or the like can be used. As shown in FIGS. 1 and 2, a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.

  The inner surface of the barrier sheet 62 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is on the side portion of the liquid-impermeable sheet 11 and on the outer side in the width direction. It fixes to the side part of the exterior sheet | seat 12 located by the hot-melt adhesive agent. Out of the adhering portions, on the outer side in the width direction in the vicinity of the adhering start end, leg elastic elastic members 64 made of rubber thread or the like are provided along the front-rear direction between the sheets of the portions where the barrier sheet 62 and the exterior sheet 12 face each other. It has been.

  Around the legs, the width direction inner side of the solid gather 60 is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the portion between them is an unfixed free part. It comes to stand by the contraction force of the thread rubber 63. When the diaper is mounted, the diaper is mounted on the body in the shape of a boat, and the contraction force of the rubber thread 63 acts, so that the three-dimensional gather 60 stands up and adheres to the legs around the contraction force of the rubber thread 63. As a result, so-called side leakage from around the legs is prevented.

  Unlike the illustrated embodiment, the front and rear direction end portions of the barrier sheet 62 on the inner side in the width direction are divided into a base end side portion extending from the outer side in the width direction to the inner side in the width direction and It is also possible to fix in a double-folded state having a distal end side portion that is folded back from the edge toward the body side and extends outward in the width direction, and the portion in between can be an unfixed free portion.

(Absorption element)
The absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool. The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The packaging sheet 58 can be omitted. The absorbent element 50 can be adhered to the inner surface of the liquid-impermeable sheet 11 via an adhesive such as a hot melt adhesive on the back surface.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used.

(Superabsorbent polymer particles)
The absorbent body 56 preferably includes superabsorbent polymer particles. In particular, at least in the liquid receiving region, the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of fibers. Is desirable.

  If there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or if there is very little, it cannot be said that the "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some SAP particles do not enter the fiber assembly and remain on the surface thereof, and a form in which some SAP particles pass through the fiber assembly and are on the packaging sheet 58 are also excluded. It is not something.

  Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , not only the effect is saturated, but also the sensation of incongruity due to the excess of the superabsorbent polymer particles is given.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The fiber basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  As shown in FIG. 3, the packaging sheet 58 may wrap only the back surface and the side surface of the layer in addition to the form for wrapping the entire absorbent body 56. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the packaging sheet). If necessary, the absorbent body 56 may be sandwiched between two upper and lower sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent the movement of the superabsorbent polymer particles.

(End flap)
The length in the front-rear direction of the back end flap BE is preferably the same as or shorter than the length in the front-rear direction of the attachment portion of the back-side locking portion 13B, which will be described later. Is excessively close, the gap between the dorsal side of the diaper and the body surface is likely to be generated due to the thickness and stiffness of the absorbent element 50, so that the thickness is preferably 10 mm or more.

  The length in the front-rear direction of the ventral end flap part FE and the back end flap part BE is preferably about 5 to 20% of the length L in the front-rear direction of the whole diaper. In particular, a thickness of 20 to 50 mm is appropriate.

(Side flap part)
The side flap portion SF includes a portion on the center side in the width direction extending over the entire front-rear direction, a pair of ventral side waist flap portions FF, FF extending to the outside in the width direction from the crotch portion C at the waist side portion, and a pair Back waist flap portions BF and BF.

  More specifically, the outer surface of each side flap portion SF, SF is integrally covered with the exterior sheet 12 including the outer surface of the absorbent main body portion 10, and the inner surface of each side flap SF, SF is the absorber. The barrier sheets 62 and 62 of the three-dimensional gathers 60 and 60 extending outward in the width direction of 56 are formed.

(Locking part)
On the inner surfaces of the back waist flap portions BF and BF on both sides of the back portion B, a back side locking portion 13B is provided. Further, in the illustrated example, ventral side locking portions 13F are provided on the outer surfaces of the ventral waist flap portions FF and FF on both sides of the ventral portion F.

  As these back side latching | locking part 13B and the ventral | claw side latching | locking part 13F, besides fixing the hook material (hook tape) of a mechanical fastener (surface fastener) with an adhesive agent etc., an adhesive layer can also be provided. In addition, when these locking portions 13B and 13F are hook materials, the locking destination is formed by a high-strength non-woven fabric such as a spunbond non-woven fabric, and a loop yarn that entangles the hook material engaging projections is a plastic film. In the case where the surface of the sheet base material made of non-woven fabric is provided with a large number of irregularities, and when the locking portions 13B and 13F are adhesive material layers, the locking destination is adhesive. The surface of the sheet substrate made of a plastic film having a smooth surface that is rich can be pasted.

  When wearing the diaper, as shown in FIG. 9, the back side waist flap part BF is overlapped on the outside of the abdominal side waist flap part FF, and the back side locking part 13B is locked to the outer surface of the abdominal side waist flap part. At the same time, the ventral side locking portion 13F is locked to the inner surface of the back side waist flap portion BF.

  When the back side locking portion 13B is attached in a range including the extended line of the boundary line between the back side end flap portion BE and the absorption element 50, the back side locking portion 13B absorbs due to the tension acting between the back side locking portion 13B when the diaper is mounted. This is preferred because the dorsal end of element 50 is pressed firmly against the body. Further, if the back side locking portion 13B is too far from the back side end portion (rear end portion) of the diaper, the tension acting between the left and right back side locking portions 13B when the diaper is mounted is the back side end portion of the diaper. Therefore, a gap is likely to occur between the back end of the diaper and the body surface. Therefore, it is preferable that the length in the front-rear direction of the back end flap BE is the same as or shorter than the length in the front-rear direction of the back-side locking portion 13B.

(Target sheet)
It is preferable to provide a target sheet 74 having a target for facilitating locking at the locking position of the back locking portion 13B on the ventral side F. As the target sheet 74, when the back side locking portion 13B is a hook material, a target sheet 74 is used in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or a nonwoven fabric so that the engagement protrusions of the hook material are entangled. In the case of an adhesive material layer, the surface of a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness can be used.

  Further, when the fastening portion of the fastening tape 13 on the ventral side F is made of a nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a nonwoven fabric and the back side locking portion 13B is a hook material, the target The sheet 74 can be omitted, and the hook material can be entangled with the nonwoven fabric of the exterior sheet 12 and locked. In this case, the target sheet 74 may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.

(Back elastic sheet)
In the illustrated embodiment, a belt-like back side elastic sheet 70 that elastically expands and contracts in the width direction is provided between both back side locking portions 13B, thereby improving the fit in the back side of the diaper. Both end portions of the back-side elastic sheet 70 are preferably extended to the portions overlapping the attachment portions of the back-side locking portions 13B, but may be spaced apart in the center in the width direction. It is appropriate that the longitudinal dimension of the back side elastic sheet 70 is substantially the same as the longitudinal dimension of the attachment portion of the back side locking portion 13B, but there may be a dimensional difference of about ± 20%. Further, when the back elastic sheet 70 is arranged so as to overlap the boundary line between the back end flap BE and the absorbent element 50 as shown, the back end of the absorbent element 50 is firmly pressed against the body. Therefore, it is preferable. The back-side elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but it is preferable to use a nonwoven fabric or paper from the viewpoint of air permeability. In this case, a sheet-like elastic member having air permeability such as a stretchable nonwoven fabric can be used. However, as shown in FIG. 5, the sheet base material 71 such as two nonwoven fabrics is bonded with an adhesive such as a hot melt adhesive. Preferably, the elastic stretch member 72 such as a perforated sheet, net, or elongated (thread or string) is fixed in a stretched state in the width direction between the sheet bases 71. Used. As the sheet base 71 in this case, the same one as the exterior sheet 12 can be used. It is preferable that the elastic expansion / contraction member 72 has an extension ratio of about 150 to 250%. In addition, when an elongated (stretch or string-like) member is used as the elastic elastic member 72, it is preferable to provide about 5 to 15 members having a thickness of 420 to 1120 dtex at intervals 72d of 3 to 10 mm.

  In addition, it is preferable that a part of the elastic expansion / contraction member 72 is arranged so as to cross the absorbent element 50 as shown in the figure because the fitting property of the absorption element 50 is improved, but in this case, the elastic expansion / contraction member 72 is used. If the contraction force is prevented from acting on a part or all of the overlapping portion by means such as cutting, the back end of the absorbent element 50 does not contract in the width direction, so that the fit is further improved.

  The elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent the sheet from shrinking or curling when attached to the diaper body, In the range of about 5 to 20 mm at the end in the front-rear direction (diaper width direction), it is preferable that the contraction force does not work or the elastic elastic member 72 does not exist.

  In the illustrated embodiment, the back-side stretchable sheet 70 is sandwiched between the barrier sheet 62 and the exterior sheet 12 on both sides in the width direction of the liquid-impermeable sheet 11 and overlaps with the liquid-impermeable sheet 11. Although provided so as to be sandwiched between the permeable sheet 11 and the absorbent element 50, it may be provided between the liquid-impermeable sheet 11 and the exterior sheet 12, or provided on the outer surface of the exterior sheet 12. Alternatively, it may be provided between the top sheet 30 and the absorbent element 50. Further, the back-side elastic sheet 70 may be provided on the top sheet 30, and in this case, it may be provided on the barrier sheet 62 on both sides in the width direction of the liquid-impermeable sheet 11. Further, when the exterior sheet 12 is formed by stacking a plurality of sheet base materials, the entire back-side stretchable sheet 70 may be provided between the sheet base materials of the exterior sheet 12.

(Product folded)
Characteristically, as shown in FIG. 7, the both sides of the back portion B are folded back evenly on the inner surface of the diaper to form the dorsal folded portion 20 and are located on the uppermost side (thickness direction). The entire back side locking portion 13 </ b> B is located on the upper surface of the folded portion 21.

  The number of times of folding is not particularly limited as long as it is an even number, and the position of folding is not particularly limited, but in the example shown in the drawing, both sides of the back portion B are easy to fold at the time of manufacture and maintain the folded shape. Both side edges of the absorber 56 and elastic elastic members 64 around the legs (extending along the front-rear direction on the outer side in the width direction than both side edges of the absorber 56 and in the center in the width direction than the back side locking portion 13B) 1st crease 81 passing between the first elastic fold 81 and the back side locking portion 13B. It is folded back in the width direction by a second crease 82 that passes between them (folded as viewed from the inner surface side). In this case, when the width of the target sheet 74 is made narrower than the width between the first folds 81 and 81 and the entire target sheet 74 is placed between the first folds 81 and 81, the rigidity of the target sheet 74 is the first. This is preferable because it does not hinder the folding at the folds 81, 81.

  The position of the second crease 82 can be determined as appropriate, but the position within the range of 1/3 to 2/3 when the position of the proximal diaper side edge is 1 with respect to the position of the first crease 81. It is preferable that it is located at 1/2 or the vicinity thereof.

  Further, both side portions of the abdominal side portion F are folded back integrally with both side portions of the back side portion B to form the abdominal side folded portion 25, and the ventral side folded portion 26 located on the uppermost side (thickness direction). The entire ventral side locking portion 13F is located on the lower surface.

  Further, in a state in which the back side folded portion 20 and the ventral side folded portion 25 are formed, it is folded in half so that the inner surface of the ventral portion F and the inner surface of the dorsal portion B are aligned with the center in the front-rear direction as a fold. The side locking portion 13F is releasably locked to the surface 27 facing the lower surface of the ventral side folded portion 26 located on the uppermost side (thickness direction), and the back side locking portion 13B of the back side portion B is the uppermost side. It is detachably locked to the upper surface of the ventral side folded portion 26 located in the (thickness direction).

  The ventral side locking portion 13F may not be provided. However, when the ventral side locking portion 13F is provided as illustrated, the locking force of the back side locking portion 13B with respect to the ventral side folded portion 25 is opposite to the ventral side locking portion 13F. It is preferable to make it stronger than the locking force with respect to the surface 27. Such a strength relationship of the locking force can be configured by providing a difference in the area of the locking portions 13F and 13B, the type of hook material, and the specifications.

  When using a diaper folded in this way, as shown in FIG. 8, the waist part of the ventral part F and the waist part of the dorsal part B in the diaper folded in two are gripped, and the gripped part is separated. Open like so. Thereby, while the back side folding | returning part 20 and the abdominal side folding | returning part 25 are pulled mutually, the latching force of the back side latching | locking part 13B with respect to the abdominal side folding | turning part 25 is the opposing surface of the abdominal side latching | locking part 13F. As shown in FIG. 8, the temporary fixing of the ventral side locking portion 13F to the facing surface 27 is first released, and then the back side locking portion 13B is peeled off from the ventral portion F, as shown in FIG. 1 is developed. That is, the work of opening the product-folded diaper can be completed with only a simple one-step work of opening the folded portion. In addition, as shown in FIG. 8, after opening a diaper to the middle so that the back side latching | locking part 13B may not peel from the abdominal part F, and putting it on like a pants-type disposable diaper, It is also possible to use the stopper 13B by peeling it from the ventral portion F and adjusting the waistline dimension.

Even when the ventral side locking portion 13F is not provided, the operation of opening the diaper is completed in the same one-step operation as described above, except that there is no peeling process of the ventral side locking portion 13F.
Regardless of whether or not the ventral side locking portion 13F is provided, if both side portions of the ventral side portion F and both side portions of the back side portion B are folded together, that is, at the same position and the same number of times, manufacturing is easy. This is preferable.

(Other)
The present invention is characterized by a product folding form, and is a general fastening type in which a fastening tape 14 having a back side locking portion 14A is projected from a side flap portion SF as shown in FIGS. It can also be applied to disposable diapers.

  The fastening tape 14 has a base portion of a sheet base material 14C made of a nonwoven fabric, a plastic film, a polylaminated nonwoven fabric, paper, or a composite material thereof attached to the diaper, and a locking portion 14A for the abdomen on the distal side protruding from the diaper. Is provided. As the locking portion 14A, a hook material of a mechanical fastener is fixed to the sheet base material 14C with an adhesive, and an adhesive material layer can be provided on the surface of the sheet base material 14C.

  In the diaper for infants, it is preferable that the length in the width direction of the diaper is 10 to 50 mm, particularly 20 to 40 mm, and the length in the front-rear direction is 20 to 100 mm, in particular, among the dimensions of the attachment portion of the fastening tape 14. It is preferable that it is 40-80 mm. Moreover, among the dimensions of the front end side portion of the fastening tape 14, the length in the width direction of the diaper is preferably 30 to 80 mm, particularly preferably 40 to 60 mm, and the length (height) in the front-rear direction is 20 to 70 mm. In particular, the thickness is preferably 25 to 50 mm. In addition, when a part or all of the fastening tape 14 has, for example, a substantially tapered shape, and the length in the front-rear direction and the length in the width direction are not constant, the numerical value range is determined by an average value. The shape of the fastening tape 14 may be a symmetric shape such as a rectangular shape. However, if the fastening tape 14 is a convex shape composed of a wide attachment portion and an elongated tip side portion, the knob portion on the tip side portion can be easily picked and This is preferable because the tension between the bases of this region acts over a wide range.

  In the fastening type disposable diaper having the fastening tape 14 as described above, both sides of the back side portion B are formed as an integral part including the fastening tape 14 and are even on the inner side of the diaper as shown in FIG. The back side folded portion 20 is formed by turning back, and the back side locking portion 14A is positioned on the upper surface thereof.

  The number of folding and the folding position are not particularly limited. However, in the illustrated example, both sides of the back portion B are elastic on both sides and legs around the absorber 56 from the viewpoint of easy folding at the time of manufacture and easy maintenance of the folded shape. The first fold 91 passing between the elastic members 64 is folded back to the center in the width direction (valley-folded when viewed from the inner surface side), and then folded outward in the width direction at the base end 92 of the protruding portion of the fastening tape 14. It is folded in a mountain (viewed from the inner side). In this case, the position of the second crease 92 can be determined as appropriate, but the range of 1/3 to 2/3 when the position of the proximal diaper side edge is 1 with respect to the position of the first crease 91. It is preferably located within.

  The other parts are basically the same as those shown in FIGS. 1 to 9, and therefore the same reference numerals are used and description thereof is omitted.

  The present invention is applicable to a fastening type disposable diaper.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impermeable sheet | seat, 12 ... Exterior sheet | seat, 13B ... Back side latching | locking part, 13F ... Abdominal side latching | locking part, 30 ... Surface sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Barrier sheet, 70 ... Dorsal elastic sheet, 74 ... Target sheet.

Claims (3)

A ventral part extending to the front side relative to the front-rear direction center, and a dorsal part extending to the rear side relative to the front-rear direction center;
A liquid-permeable top sheet forming a body-side surface, a liquid-impermeable sheet located on the outer surface side, and an absorbent body interposed therebetween,
A dorsal locking portion provided on both sides of the dorsal portion,
In a fastening type disposable diaper that is worn by locking both dorsal side locking parts to the ventral side part,
Both side portions of the back side portion are folded back evenly on the inner surface side of the diaper to form a back side folded portion, and the back side locking portion is provided on the upper surface of the uppermost back side folded portion,
Folded in half so that the inner surface of the ventral part and the inner surface of the dorsal part are combined with the center in the front-rear direction as a crease, the dorsal locking portion of the dorsal part is releasably locked to the inner surface of the ventral part Yes,
Fastening type disposable diaper characterized by that. Elastic stretchable members extending along the front-rear direction are provided on the outer side in the width direction than both side edges of the absorber and on the center side in the width direction than the back side locking portion, respectively.
Both side portions of the back side portion are folded back to the center in the width direction by first folds passing between both side edges of the absorber and the elastic elastic member, and then the elastic elastic member and the back side engagement Folded back outward in the width direction at a second fold passing between the two parts,
The fastening type disposable diaper according to claim 1. The both sides of the outer surface of the ventral part are provided with ventral locking parts that are locked with the inner surfaces of both sides of the back part, respectively.
Both sides of the ventral part are folded together with both sides of the dorsal part to form a ventral folded part, and the ventral locking part is provided on the lower surface of the uppermost ventral folded part As well as
Folded in half so that the inner surface of the ventral part and the inner surface of the dorsal part are combined with the center in the front-rear direction as the crease,
The ventral side locking portion is separably locked to a surface facing the lower surface of the uppermost ventral side folded portion,
The dorsal locking portion of the dorsal side portion is releasably locked to the upper surface of the uppermost ventral side folded portion, and the locking force of the dorsal side locking portion with respect to the ventral side folded portion is Stronger than the locking force of the ventral side locking portion against the opposing surface,
The fastening type disposable diaper according to claim 1 or 2.

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