JP2023004770A - Articulated disposable diaper - Google Patents

Abstract

To facilitate taking a good limb position, and cover a side of buttocks more widely than the interval of both legs in the good limb position.SOLUTION: The problem is solved in the following. When a contour constricted part 70 provided from the middle in a longitudinal direction LD of a ventral side portion F over the middle in the longitudinal direction LD of a dorsal side portion B is divided into three parts of a first area 71, a second area 72 and a third area 73 in an order from the front, the first area 71 has the narrowest region 71n in the contour constricted part 70, the second area 72 has a contour wide region 72w being wider than the narrowest regions 71n, 73n of the first area 71 and the third area 73, the contour constricted part 70 has a gradually decreasing area becoming narrow over the narrowest region 71n in the first area 71 from the contour wide region 72w, the width of the contour wide region 72w is 2.2-3.5 times of the width of the narrowest region 56m of an absorbent body constricted part 56n, and the width of the narrowest region 71n of the first area 71 is 2.0-3.3 times of the width of the narrowest region 56m of the absorbent body constricted part 56n.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to an articulated disposable diaper that allows the wearer to easily bend the wearer's legs toward the abdomen without opening the legs.

A connecting type (also called a tape type) disposable diaper is worn by applying it to the body in an unfolded state and then connecting the connecting portions provided on both the left and right sides of the dorsal portion to the outer surface of the abdominal portion. .

A typical connectable disposable diaper has an abdominal portion extending forward from the center in the front-rear direction, a back portion extending rearward from the center in the front-rear direction, and a back portion extending from the center in the front-rear direction to the back portion of the abdominal portion. and an absorbent body provided over the middle in the front-rear direction. In addition, an outer constricted portion having a width narrower than both front and rear sides extends from the front-rear middle of the abdominal portion to the front-rear middle of the dorsal portion so that both side edges of the connectable disposable diaper follow the circumference of the wearer's legs. connecting portions detachably connected to the abdominal portion provided on both sides of the dorsal portion so that the both sides of the ventral portion and the both sides of the dorsal portion can be overlapped and connected; It has During use, both sides of the dorsal portion are turned from both sides of the waist to the outer surface of the ventral portion, and the connecting portions of both sides of the dorsal portion are connected to the outer surface of the ventral portion (see, for example, Patent Document 1).

The outer shape constricted portion can be formed by cutting the side flap portion extending laterally from the side edge of the absorbent body so as to follow the leg circumference (see, for example, Patent Document 1). Separately manufactured wing portions may be attached to both side edges of the front end portion and both side edges of the rear end portion to form a contour constriction portion between the front and rear wing portions.

In addition, with a general connectable disposable diaper, when in a good leg position (here, a bent posture in which both legs are bent to the abdomen without opening them. A leg position similar to the bent posture of a fetus in the womb.) , the leg comes into contact with the constricted part of the outer shape, which tends to hinder the bending of the thigh or cause a tight fit. In particular, when the wearer is an extremely low birth weight infant, maintaining a prone position with the arms and legs bent and not opening the legs is extremely important as well as preventing excessive stress on the skin such as friction. is important. In addition, it is preferable that infants and adults other than low birth weight infants are able to maintain a good leg position without difficulty. For this reason, narrowing the crotch width as disclosed in Patent Document 1, for example, is one preferred form.

However, simply narrowing the crotch width tends to create gaps around the legs, which may lead to leakage. Moreover, even if it does not leak, there is also a problem that the skin is exposed more.

JP 2020-156838 A Japanese Patent Application Laid-Open No. 2020-039772

Therefore, the main object of the present invention is to provide an articulated disposable diaper that allows the wearer to easily assume a good leg position, and that can cover the buttocks side more widely than between the legs in the state of the good leg position. It is in.

The connected disposable diaper that solves the above problems is as follows.
<First Aspect>
a ventral portion extending forward from the center in the front-rear direction;
a dorsal portion extending rearward from the center in the front-rear direction;
an outline constricted portion narrower than both front and rear sides provided from the middle of the ventral portion in the front-rear direction to the middle of the dorsal portion in the front-rear direction;
an absorber provided from the middle of the abdominal portion in the front-rear direction to the middle of the back portion in the front-rear direction;
an absorbent body constricted portion provided in the middle of the absorbent body in the front-rear direction and having a width narrower than both front and rear sides;
connecting portions provided on both sides of the dorsal portion and detachably connected to the ventral portion;
When the outer shape constricted portion is divided into thirds in order from front to back into a first region, a second region and a third region, the first region has the narrowest portion in the outer shape constricted portion, The second region has a wide outline portion that is wider than the narrowest portion in the first region and the narrowest portion in the third region,
The contour constricted portion has a gradually decreasing region in which the width narrows continuously or stepwise from the wide contour portion to the narrowest portion in the first region,
The width of the wide outer shape portion is 2.2 to 3.5 times the width of the narrowest portion of the constricted portion of the absorbent body,
The width of the narrowest portion in the first region is 2.0 to 3.3 times the width of the narrowest portion in the absorbent body constricted portion.
A connected disposable diaper characterized by:

(Effect)
In general disposable diapers, since the part containing the absorbent body has the highest rigidity, the absorbent body constricted portion is often provided so that the absorbent body can be accommodated in the crotch. In this case, the absorbent body constricted portion is designed to match the wearer's crotch, and the narrowest part of the absorbent body constricted portion serves as the crotch width, which is one of the standards for the absorbent body and outer shape. In light of this standard, the features of the articulated disposable diaper of this embodiment become obvious. That is, in the connectable disposable diaper of this aspect, since the narrowest part is provided in the first region located on the front side of the constricted outer shape, the constricted outer shape is less likely to hit the leg when the leg is in a good position. In addition, the width of the second region located in the middle of the outer shape constricted portion in the front-rear direction is remarkably wider than the narrowest part (crotch width) of the absorbent body constricted portion, so that a good leg position is achieved. In this state, the buttocks side can be covered more widely than between the legs, and skin exposure and leakage can be reduced.

<Second Aspect>
The dimension of the outer shape constricted portion in the front-rear direction is 2.5 to 4.0 times the width of the narrowest portion of the absorbent body constricted portion,
The dimension in the front-rear direction of the constricted portion of the absorbent body is 0.5 to 0.7 times the dimension in the front-rear direction of the constricted portion of the outer shape,
The absorbent body constricted portion is located on the rear side of the narrowest portion of the first region,
An articulated disposable diaper according to the first aspect.

(Effect)
The dimensions of the outer shape constricted portion and the absorber constricted portion in the front-rear direction can be determined as appropriate, but are preferably within the scope of this aspect. Furthermore, when the narrowest part of the first region is positioned within the range in the front-rear direction having the absorbent body constricted portion, the wearer's legs are less likely to come into contact with the side edges of the absorbent body when the wearer is in a good leg position. However, since the risk of leakage increases, it is preferable that the absorbent body constricted portion is located behind the narrowest portion of the first region as in this aspect.

<Third Aspect>
An elongated outside elastic member is attached along the front-rear direction to a side region positioned between a side edge of the outer shape constricted portion and a side edge of the absorber constricted portion,
The side region is contracted together with the outside elastic member due to the contractile force of the outside elastic member, and is expandable together with the outside elastic member,
a widthwise interval between the side edge of the narrowest portion of the first region and the outside elastic member is 5 to 10 mm;
The front end of the outside elastic member is positioned between the front end of the constricted portion and the narrowest portion of the first region,
An articulated disposable diaper according to the first or second aspect.

(Effect)
By locating the outside elastic member within the range of this mode, good fit is obtained when the leg is in a good position.

<Fourth Aspect>
At least the side edges of the entire second region and the portion extending from the front end thereof to the narrowest portion of the first region have a center of curvature located on the opposite side of the side edge, and are the narrowest part of the absorbent body constricted portion. has an arc shape with a radius of curvature of 3.0 to 7.0 times the width of the narrow part of
An articulated disposable diaper according to any one of the first to third aspects.

(Effect)
The side edge shape of the outer constricted portion can be determined as appropriate, but if it has an arc shape that swells sideways as in this aspect, it is easier to achieve a good leg position, and in the state of a good leg position, it is easier to move from between the legs. is also preferable because it can cover a wide area on the buttock side.

<Fifth Aspect>
The contour constricted portion has a shape that is symmetrical with respect to an imaginary straight line that passes through the center in the front-rear direction and extends in the width direction.
An articulated disposable diaper according to any one of aspects 1 to 4.

(Effect)
BACKGROUND ART Wearers of low birth weight infants and the like sometimes wear an articulated disposable diaper upside down in order to avoid changing their posture. Therefore, in order to be able to cope with such a case, it is preferable that the outer shape constricted portion has a front-rear symmetrical shape as in this aspect.

<Sixth Aspect>
When the constricted portion of the absorbent body is divided into thirds in order from front to back into a fourth region, a fifth region, and a sixth region, the fourth region has the narrowest portion in the constricted portion of the absorbent body, The fifth region has a wide absorbent body region wider than the narrowest region in the fourth region and the narrowest region in the sixth region,
The absorbent body constricted portion has a gradually decreasing region in which the width narrows continuously or stepwise from the wide absorbent body region to the narrowest region in the fourth region,
The side edge of the tapered region of the absorbent body constricted portion is formed parallel to the side edge of the tapered region of the contour constricted portion,
An articulated disposable diaper according to any one of aspects 1 to 5.

(Effect)
The constricted portion of the absorbent body is also provided with a gradually decreasing region similar to the constricted portion of the outer shape, and the side edges of the gradually decreasing region of the constricted portion of the absorbent body are formed in parallel with the side edges of the gradually decreasing region of the constricted portion of the outer shape. It is preferable because the wearer's legs are particularly unlikely to come into contact with the side edges of the absorbent body when the wearer's legs are in the good leg position.
<Seventh Aspect>
a liquid-permeable top sheet arranged on the front side of the absorbent;
and riser gathers respectively provided on both sides in the width direction of the surface of the top sheet,
The rising gathers are formed from a base portion attached to the outside in the width direction of an imaginary line continuing in the front-rear direction through blocking positions on both sides in the width direction of the surface of the top sheet, and an inner edge in the width direction of the base portion. a main body extending inward in the width direction without being folded back;
The main body portion has a front end and a rear end having a fixed portion fixed to the top sheet, and an intermediate portion located between the front end and the rear end and not fixed to the top sheet. death,
An elongated gathered elastic member extending in the front-rear direction is attached to at least the tip of the intermediate portion,
the intermediate portion is contracted together with the gathers elastic member due to the contraction force of the gathers elastic member, and is expandable together with the gathers elastic member;
A free portion that is not fixed to the top sheet is provided at an inner end portion in the width direction of at least one of the front end portion and the rear end portion so as to continue from the intermediate portion. A fixed portion is provided at the rear end portion other than the free portion,
The width of the free portion is 1/6 to 1/3 of the width of the intermediate portion, and the dimension of the free portion in the front-rear direction is 1 to 9.5 times the width of the free portion.
An articulated disposable diaper according to any one of aspects 1 to 6.

(Effect)
Currently, most absorbent articles such as disposable diapers and sanitary napkins are provided with riser gathers (also called three-dimensional gathers) that rise from both sides in the width direction of the surface of the top sheet. By providing the rising gathers, lateral movement of the excrement is blocked by the rising gathers, and so-called side leakage is prevented.

Many of the rise gathers are composed of a base portion attached to the outside in the width direction of an imaginary line continuing in the front-rear direction through the cut-off positions on both sides in the width direction of the surface of the top sheet, and a main portion extending from the inner edge in the width direction of the base portion. and a fixing portion in which the front end portion and the rear end portion of the main body portion are fixed to the surface of the top sheet in a fallen state, and an intermediate portion located between the front and rear fixing portions of the main body portion and not fixed to the surface of the top sheet. and These parts are formed of gather sheets such as non-woven fabric. Of these, at least the tip of the rising gather has a two-layer structure in which the gather sheet is folded back at the tip (pointing end), and an elongated gather elastic member extends in the front-rear direction between the layers of at least the tip of the intermediate part. attached in an extended state along the (See Patent Document 1, for example).

The intermediate portion is contracted together with the gathers elastic member due to the contraction force of the gathers elastic member, and is expandable together with the gathers elastic member. In the attached state, the contractile force of the gathered elastic member shortens the front-to-rear dimension of the tip of the intermediate portion, and the intermediate portion is not fixed to the top sheet. part), and lower as it approaches the fixed parts of the front and rear ends.

In particular, in many connected disposable diapers, the body portion of the riser gather extends inward in the width direction without being folded back from the base portion, and the tip of the body portion faces inward in the width direction.

However, such an inward-facing type of sit-up gather has a problem that there is a limit to the sit-up angle (and therefore the sit-up height) in the crotch area, and the middle part that rises from the surface of the top sheet is difficult to fall outward, preventing loose stools from leaking. While it has excellent preventive properties, it has the problem that the tip of the sit-up gather tends to come into contact with the skin when the leg is in a good position.

On the other hand, in the rising gathers of this aspect, a free portion (a portion not fixed to the top sheet) having a certain width is provided at the inner end portion in the width direction of at least one of the front end portion and the rear end portion of the main body portion. ) are provided so as to continue from the middle portion. For this reason, in the attached state, the front and rear fixed parts suppress the rising of the intermediate part, but the degree of suppression is the rising of the free part does not rise), the rising angle of the intermediate portion is surely larger than that in the case where there is no free portion. In addition, the presence of the free portion makes it easier for the tip of the intermediate portion to move in the width direction, so that the tip of the intermediate portion is less likely to come into tight contact with the skin when the wearer is in a good leg position.

<Eighth Aspect>
Disposable diapers for low birth weight babies,
An articulated disposable diaper according to any one of aspects 1 to 7.

(Effect)
For disposable diapers for low birth weight infants, it is preferable to have a good leg position and a soft but weak fit rather than a tight fit. Therefore, the shape of the constricted portion of the outer shape, the shape of the constricted portion of the absorber, or the sit-up gathers having the free portion are suitable for disposable diapers for low birth weight infants.

ADVANTAGE OF THE INVENTION According to this invention, although a wearer is easy to take a good leg position, advantages, such as being able to cover the buttocks side more widely than between both legs in the state of a good leg position, are brought about.

Fig. 2 is a plan view showing the inner surface of the connectable disposable diaper in an unfolded state; Fig. 2 is a plan view showing the outer surface of the connectable disposable diaper in an unfolded state; 6 is a cross-sectional view taken along line 6-6 of FIG. 1; FIG. FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 1; FIG. 2 is a cross-sectional view taken along line 8-8 of FIG. 1; 5 is a cross-sectional view taken along line 5-5 of FIG. 1; FIG. Fig. 2 is a plan view showing only the essential parts of the connected disposable diaper in an unfolded state; Fig. 2 is a plan view showing only the essential parts of the connected disposable diaper in an unfolded state; Fig. 2 is a plan view showing the inner surface of the connectable disposable diaper in an unfolded state; FIG. 4 is a cross-sectional view showing an enlarged main part of the rising gathers; FIG. 4 is a cross-sectional view showing an enlarged main part of the rising gathers; Fig. 2 is a plan view showing the inner surface of the connectable disposable diaper in an unfolded state; Fig. 2 is a plan view showing only the essential parts of the connected disposable diaper in an unfolded state;

1 to 6 show a connected disposable diaper (generally also referred to as a tape-type disposable diaper) as an example, and the symbol X in the figures indicates the full width of the diaper excluding the connecting tape 13, and the symbol L indicates the total length of the diaper. Note that, unless otherwise indicated, the dotted pattern portions and the asterisks (*) in the cross-sectional views indicate hot-melt adhesives as joining means for joining the components positioned on the front and back sides. The hot-melt adhesive can be applied by slot coating, continuous-line or dotted-line bead coating, spiral-shaped, Z-shaped, wavy-shaped spray coating, or pattern coating (transfer of hot-melt adhesive by letterpress method). can be applied by any method. Alternatively or additionally, at the fixing portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation. As a fixing or joining means for joining each constituent member, a material welding means such as heat sealing or ultrasonic sealing can be used. In portions where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or bonding is performed with a hot-melt adhesive, intermittent pattern coating such as spiral, Z-shaped, and wavy patterns can be preferably used, and the range of coating width by one nozzle or more can be preferably used. In the case of coating, intermittent pattern coating such as spiral, Z-shape, wave-like, etc. can be performed with or without spacing in the width direction WD.

This connected disposable diaper has a crotch portion M including the center in the front-rear direction LD, an abdominal portion F extending forward from the center in the front-rear direction LD, and a back portion B extending rearward from the center in the front-rear direction LD. have. In addition, this connected disposable diaper includes an absorbent body 56 built in a range including the crotch portion M, a liquid-permeable top sheet 30 covering the front side of the absorbent body 56, and a liquid-impermeable body covering the back side of the absorbent body 56. and an exterior nonwoven fabric 12 that covers the back side of the liquid-impermeable sheet 11 and constitutes the outer surface of the product. The crotch portion M means a range in the front-rear direction LD having an absorber constricted portion 56n, which will be described later. As an example, the dimension of the crotch portion M in the front-rear direction LD can be about 55 to 65% of the total length of the product.

The materials and characteristic parts of each part will be described in order below. In addition, as the nonwoven fabric in the following description, a known nonwoven fabric can be appropriately used depending on the site and purpose. Constituent fibers of non-woven fabrics include, for example, synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (including composite fibers such as core-sheath fibers in addition to single-component fibers), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, etc., can be selected without particular limitation, and these can also be mixed and used. In order to increase the softness of the nonwoven fabric, it is preferable to use crimped fibers as the constituent fibers. In addition, even if the constituent fibers of the nonwoven fabric are hydrophilic fibers (including fibers made hydrophilic by a hydrophilic agent), they are hydrophobic fibers or water-repellent fibers (including fibers made water-repellent by a water-repellent agent). ). In addition, nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bonded (air-through) nonwoven fabrics, and needle punched nonwoven fabrics, depending on the fiber length, sheet forming method, fiber bonding method, and laminate structure. Nonwoven fabrics are classified into nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (including SMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers, SMMS nonwoven fabrics, etc.), etc., and any of these nonwoven fabrics can be used.

(Absorber)
The absorbent body 56 is a part that absorbs and retains the excreted fluid, and can be formed by an assembly of fibers. The filament assembly is obtained by laminating staple fibers such as cotton pulp or synthetic fibers, or by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as necessary. can also be used. The fiber basis weight can be, for example, about 100 to 300 g/m ² when piling up cotton pulp or short fibers, and for example, about 30 to 120 g/m ² for filament aggregates. can be done. The fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but crimped fibers are preferred. The degree of crimping of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, more preferably 15 to 50 per 2.54 cm. Further, uniformly crimped crimped fibers can be used.

The absorber 56 is provided from the middle of the ventral portion F in the front-rear direction LD to the middle of the back portion B in the front-rear direction LD. Further, the absorbent body 56 has an absorbent body constricted portion 56n whose width is narrower than that of the front and rear sides of the portion located in the crotch portion M as shown in the illustrated example. The shape of both front and rear portions of the absorbent body constricted portion 56n can be determined as appropriate, and from the viewpoint of ease of manufacture, both side edges are preferably linear along the front and rear direction LD, but may be curved. , and the corners may be curved or obliquely straight. The side edge shape of the absorbent body constricted portion 56n can be determined as appropriate. For example, the shape formed by both side edges of the absorbent body constricted portion 56n and line segments connecting the front and rear ends thereof may be trapezoidal as shown in FIG. Further, the side edge of the absorber constricted portion 56n may be a wavy line shape, or an arbitrary curved shape in which the radius of curvature changes stepwise (a shape in which a plurality of arcs are connected) or continuously.

(superabsorbent polymer particles)
Absorbent body 56 may contain superabsorbent polymer particles in part or in its entirety. Superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are. Although the particle size of the superabsorbent polymer particles is not particularly limited, for example, sieving using a 500 μm standard sieve (JIS Z8801-1: 2006) (shaking for 5 minutes), and particles falling under the sieve in this sieving When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the percentage of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve It is desirable that the proportion of particles remaining on the top is 60% by weight or more.

Materials for the superabsorbent polymer particles may be used without any particular limitation, but those having a water absorption of 40 g/g or more are suitable. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used. As for the shape of the superabsorbent polymer particles, the powder particles that are commonly used are suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called reversion.

As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the absorbent body 56 is bulky, it is possible to effectively suppress the feeling of stickiness after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56 . Therefore, although it cannot be generalized, it can be usually 50 to 350 g/m ² .

(packaging sheet)
In order to prevent the superabsorbent polymer particles from slipping out or to improve the shape retention of the absorbent body 56, the absorbent body 56 can be incorporated as an absorbent element 50 wrapped with a wrapping sheet 58. FIG. As the wrapping sheet 58, tissue paper, especially crepe paper, nonwoven fabric, poly-laminated nonwoven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the sheet is such that the superabsorbent polymer particles do not escape. When non-woven fabric is used instead of crepe paper, 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 have a structure that wraps the entire absorber 56 with one sheet, or may wrap the entire absorber 56 with a plurality of sheets, such as two upper and lower sheets. The packaging sheet 58 can also be omitted.

(top sheet)
The top sheet 30 is liquid-permeable, and may be, for example, a perforated or non-perforated nonwoven fabric, or a perforated plastic sheet.

Although the top sheet 30 extends from the front end to the rear end of the product in the front-rear direction, it can be appropriately deformed as necessary. In addition, the illustrated top sheet 30 extends outside the boundary between the body portion 66 and the base portion 65 of the rising gathers 60 described later in the width direction WD, but is not limited to this. The illustrated top sheet 30 extends laterally beyond the side edges of the absorbent body 56, but if necessary, the side edges of the top sheet 30 may be positioned inside the side edges of the absorbent body 56, for example. Appropriate modifications are possible.

(intermediate sheet)
Although not shown, an intermediate sheet (also called a "second sheet") may be provided adjacent to the back side of the top sheet 30 in order to prevent liquid that has permeated the top sheet 30 from returning.

As the intermediate sheet, various nonwoven fabrics can be suitably used, and particularly bulky air-through nonwoven fabrics can be suitably used. Composite fibers having a core-sheath structure are preferably used for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. The basis weight is preferably 17-80 g/m ² , more preferably 25-60 g/m ² . The thickness of the raw fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose core is not in the center as mixed fibers of all or part of the raw material fibers.

The intermediate sheet may be shorter than the width of the absorbent body 56 and arranged in the center, or may be arranged so as to cover the entire width of the absorbent body 56 . Further, the intermediate sheet may be provided over the entire length L of the diaper, or may be provided only in the intermediate portion including the excretion position.

(liquid-impermeable sheet)
The liquid-impermeable sheet 11 is not particularly limited, but preferably has moisture permeability. As the liquid-impermeable sheet 11, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, the sheet is molded, and then the sheet is stretched in a uniaxial or biaxial direction. A sheet can be preferably used. Moreover, as the liquid-impermeable sheet 11, a non-woven fabric as a base material with improved waterproofness can also be used.

It is preferable that the liquid-impermeable sheet 11 has an extension portion extending outward in the width direction WD from the top sheet 30 . It is desirable that the liquid-impermeable sheet 11 extends in the same or wider range than the absorber 56 in the front-rear direction LD and the width direction WD.

(exterior non-woven fabric)
The exterior nonwoven fabric 12 covers the entire back side of the liquid-impermeable sheet 11 to give the outer surface of the product a cloth-like appearance. The non-woven fabric can be used singly or in multiple layers. In the latter case, it is preferable to bond the nonwoven fabrics together with a hot-melt adhesive or the like. When a nonwoven fabric is used, it is preferable that the nonwoven fabric has a fineness of 1.0 to 6.0 dtex, a basis weight of 15 to 45 g/m ² and a thickness of 0.5 to 3.0 mm.

A sheet other than a nonwoven fabric can be used in place of the exterior nonwoven fabric 12, and the exterior nonwoven fabric 12 can be omitted.

(end flap part, side flap part)
The connected disposable diaper of the illustrated example has a pair of end flap portions EF without the absorbent body 56 extending to the front side and the rear side of the absorbent body 56 respectively, and a pair of end flap portions EF extending laterally from both side edges of the absorbent body 56 . It has a pair of side flap portions SF which do not have the absorber 56 and which extend from each other. The side flap portions SF may be made of a material (exterior nonwoven fabric 12 or the like) that continues from the portion having the absorber 56 as shown in the drawing, or may be formed by attaching another material.

(External constricted part, wing part)
In this connected disposable diaper, the region extending from the middle of the front-rear direction LD of the ventral portion F to the middle of the back-side portion B in the front-rear direction LD is an outer shape constricted portion 70 narrower than both front and rear sides of the region. The front and rear portions 70F and 70B of the constricted portion 70 are wing portions WP extending outward in the width direction WD from the constricted portion 70 . The constricted portion 70 and the wing portion WP can also be formed of a member different from the other portions. However, in the structure having the side flap portion SF as in the illustrated example, by cutting the middle of the side portion of the side flap portion SF in the front-rear direction LD, the outer shape constricted portion 70 is formed, and as a result, the wing portion WP is formed. Forming is preferable because it is easy to manufacture.

(connecting tape)
As shown in FIGS. 1, 2 and 6, the wing portions WP of the dorsal portion B are provided with connecting tapes 13 that are detachably connected to the outer surface of the ventral portion F. As shown in FIGS. When wearing the diaper 10, the connecting tape 13 is wrapped around the outer surface of the abdominal portion F from both sides of the waist, and the connecting portions 13A of the connecting tape 13 are connected to the outer surface of the abdominal portion F at appropriate locations.

As shown in FIG. 6, the connecting tape 13 includes a base end portion 13C fixed to the wing portion WP, a main body portion 13B extending from the base end portion 13C, a sheet base material, and a main body of the sheet base material. and a connecting portion 13A for the ventral portion F provided in the middle portion in the width direction WD of the portion 13B. The base end portion 13C side of the connecting portion 13A in the main body portion 13B is a non-connecting portion that is not connected to the ventral portion F. As shown in FIG. The side edge of the base end portion 13C may coincide with the side edge of the wing portion WP, or may be slightly spaced inward in the width direction WD from the side edge of the wing portion WP as shown in the figure. good. The inner edge in the width direction of the connecting portion 13A may coincide with the side edge of the wing portion WP, but as shown in FIG. Preferably, they are spaced apart.

As the connection portion 13A, a hook member (male member) of a mechanical fastener (surface fastener) may be provided, or an adhesive layer may be provided. The hook material has a large number of engaging projections on its connection surface, and the shapes of the engaging projections are (A) square-shaped, (B) J-shaped, (C) mushroom-shaped, and (D). Although there are a T shape, (E) a double J shape (a shape in which two J shapes are joined back to back), and the like, any shape may be used.

Nonwoven fabric, plastic film, poly-laminated nonwoven fabric, paper, and composite materials thereof can be used as the sheet base material forming the base end portion 13C to the main body portion 13B. A spunbond nonwoven fabric, an air-through nonwoven fabric, or a spunlaced nonwoven fabric having a basis weight of 60 to 100 g/m ² and a thickness of 1 mm or less is preferred.

The connecting tape 13 may be one in which at least a part of the non-connecting portion is stretchable in the width direction WD, or the whole is not stretchable.

(Target part)
A target portion 12T is provided at a connecting portion of the connecting tape 13 in the ventral portion F. As shown in FIG. The target portion 12T can be provided by attaching a sheet material to the outer surface of the ventral portion F to facilitate connection, as shown in the illustrated example.

The sheet material for forming the target portion 12T is not particularly limited. Non-woven fabrics can be used.

When the connecting portion 13A is made of a hook material, a large number of loop threads that engage the engaging projections of the hook material are sewn onto the surface of the base material made of plastic film or non-woven fabric as a sheet material for forming the target portion 12T. A laminated composite sheet material can be used.

Furthermore, when the connecting portion 13A is a hook material and the connecting portion of the connecting tape 13 in the ventral portion F is made of nonwoven fabric (for example, when the outer nonwoven fabric 12 is provided as in the illustrated example), the target portion 12T is formed. Therefore, without adding a sheet material, a suitable portion of the exterior nonwoven fabric 12 may be used as the target portion 12T, and the hook material may be entangled with the fibers of the exterior nonwoven fabric 12 to be connected.

On the other hand, when the connecting portion 13A is an adhesive layer, the surface of a sheet material made of a highly adhesive plastic film with a smooth surface is subjected to release treatment as a sheet material for forming the target portion 12T. can use things.

(Details of shape of external constriction)
Characteristically, as shown in FIG. 7 only for the main part, when the outer shape constricted portion 70 is divided into three equal parts from front to back into a first region 71, a second region 72 and a third region 73, the first The region 71 has the narrowest portion 71n in the constricted portion 70 at a suitable location such as the middle of the longitudinal direction LD. It has a narrow width portion 71n and a wide outline portion 72w that is wider than the narrowest portion 73n in the third region 73 . Further, the contour constricted portion 70 has a gradually decreasing region in which the width is narrowed continuously or stepwise from the wide contour portion 72w to the narrowest portion 71n of the first region 71. As shown in FIG. The narrowest portion 56m of the absorbent body constricted portion 56n is located in the second region 72, and the width w2 of the wide outer width portion 72w is the narrowest portion 56m of the absorbent body constricted portion 56n (example shown in FIG. 7). 2.2 to 3.5 times (more preferably 2.6 to 3.3 times) the width w1 of the second region 72), which is the narrowest width in the first region 71. The width w3 of the portion 71n is 2.0 to 3.3 times (more preferably 2.3 to 3.0 times) the width w1 of the narrowest portion 56m of the absorbent body constricted portion 56n. Hereinafter, these are also referred to as basic conditions.

In the connected disposable diaper having such a side edge shape, the narrowest portion 71n is provided in the first region 71 located on the front side of the constricted portion 70. The width w2 of the second region 72 located in the middle of the outer shape constricted portion 70 in the front-rear direction LD becomes smaller than the narrowest portion 56m (crotch width) of the absorbent body constricted portion 56n. Since it is remarkably wide, it is possible to cover a wider area on the buttock side than between the legs when the legs are in a good position, and it is possible to reduce skin exposure and leakage.

The dimension of the constricted portion 70 in the front-rear direction LD can be determined appropriately. As an example, the dimension of the outer shape constricted portion 70 in the front-rear direction LD is 2.5 to 4.0 times the width w1 of the narrowest portion 56m of the absorbent body constricted portion 56n (or 0.5 to 0.5 times the total length of the product). .7 times). In addition, the dimension of the absorbent body constricted portion 56n in the front-rear direction LD can also be appropriately determined. As an example, the dimension in the front-rear direction LD of the absorbent body constricted portion 56n can be 0.5 to 0.7 times the dimension in the front-rear direction LD of the outer shape constricted portion 70 . In particular, if the narrowest part 71n in the first region 71 is positioned within the range in the front-rear direction LD having the absorbent body constricted portion 56n, the leg of the wearer in a good position will be absorbed by the absorbent body 56. It is preferable in that it is less likely to hit the side edge of the However, as shown in FIG. 13, it is preferable that the absorbent body constricted portion 56n is located behind the narrowest portion 71n in the first region 71, because the risk of leakage is reduced. As will be described later, when the third region 73 has the narrowest portion 73n of the outer shape constricted portion 70 at an appropriate location such as the middle of the front-rear direction LD, for the same reason, the absorber constricted portion 56n can It is preferably positioned forward of the narrowest portion 73n in the third region 73. As shown in FIG.

As dimensions for low birth weight infants, for example, the total length L can be about 200 to 300 mm, the total width X can be about 150 to 230 mm, and the narrowest part 56 m in the absorbent body constricted portion 56 n The width w1 of the outer shape wide portion 72w can be set to about 35 to 60 mm, the width w2 of the outer wide portion 72w can be set to about 110 to 130 mm, and the width w3 of the narrowest portion 71n in the outer shape constricted portion 70 can be set to 105 to 125 mm. The dimension in the front-rear direction LD of the outer shape constricted portion 70 can be about 120 to 150 mm, and the dimension in the front-rear direction LD of the absorbent body constricted portion 56n can be about 70 to 120 mm.

The shape of the side edge of the constricted portion 70 can be determined as appropriate as long as it complies with the basic conditions described above. That is, in the illustrated example, the center of curvature of the entire second region 72 and the side edge of the portion extending from the front end thereof toward the narrowest portion 71n of the first region 71 is located on the opposite side of the side edge, and the absorbent body It has a curvature radius of 3.0 to 7.0 times the width w1 of the narrowest portion 56m of the constricted portion 56n (or an acute crossing angle between the tangent line of the side edge and the front-rear direction LD is 20 to 35 degrees. There may be) It has an arc shape. In this way, when the second region 72 and the portion up to the narrowest portion 71n of the first region 71 following it form a laterally bulging arc shape, it is easy to achieve a good leg position and a good leg position. It is preferable because it can cover a wider area on the buttock side than between the legs in the posture.

In this case, as in the illustrated example, the narrowest portion 71n in the first region 71 has a curvature radius of 0.1 to 0.5 times the width of the narrowest portion 56m of the absorbent body 56, An arc-shaped curve having a center of curvature outside the width direction WD of the diaper is preferable.

On the other hand, as in the illustrated example, when the side edge of the portion on the front side of the narrowest portion 71n of the first region 71 has a wave shape in which three or more arcs are connected so as to have a plurality of inflection points. , and the angle of the line segment connecting the inflection points with respect to the width direction WD is preferably 30 to 55 degrees (especially 35 to 45 degrees), because the side edges are less likely to come into tight contact with the front surface of the leg.

In the illustrated example, the entire side edge of the constricted portion 70 has a curvilinear shape connecting a large number of arcs, but part or all of it may be linear, or the radius of curvature is continuous. It may have a curved shape other than a circular arc that changes linearly. In particular, the front side of the narrowest portion 71n in the first region 71 is formed in a wavy shape having many inflection points in the illustrated example, but as shown in FIG. It may be curved such as. Further, the inflection point of the side edge shape of the outer shape constricted portion 70 in the illustrated example is not bent but rounded, but may be bent at part or all of the inflection point.

The shape of the front and rear portions 70F and 70B of the constricted portion 70 can be determined as appropriate. From the viewpoint of ease of manufacture, both side edges are preferably linear along the front and rear direction LD. Also, the corners may be curved or obliquely straight.

BACKGROUND ART Wearers of low birth weight infants and the like sometimes wear an articulated disposable diaper upside down in order to avoid changing their posture. Therefore, in order to be able to cope with such a case, as in the illustrated example, the constricted portion 70 has a shape symmetrical with respect to an imaginary straight line extending in the width direction WD through the center in the front-rear direction LD (that is, the third The region 73 has a narrowest portion 73n of the constricted portion 70 at a suitable location such as the middle of the longitudinal direction LD, and extends from the wide portion 72w of the second region 72 to the narrowest portion 73n of the third region 73. preferably has a tapered region of continuous or stepwise narrowing). Note that the shape of the third region 73 in this case is basically the same as that of the first region 71 except that the front and rear sides are different, so the description is intentionally omitted. Of course, the constricted portion 70 may have an asymmetric shape in the front-rear direction, such as a constant width from the wide portion 72 w of the second region 72 to the front side of the third region 73 .

On the other hand, as in the example shown in FIG. 8, when the absorbent body constricted portion 56n is divided into thirds from front to back into a fourth region 84, a fifth region 85 and a sixth region 86, the fourth region 84 The absorber constricted portion 56n has a narrowest portion 84n at an appropriate location such as the middle of the front-rear direction LD, and the fifth region 85 has the narrowest portion 84n in the fourth region 84 at an appropriate location such as the middle of the front-rear direction LD. It has an absorbent body wide part 85w wider than the narrowest part 86n in the part 84n and the sixth region 86, and the absorbent body constricted part 56n is the narrowest in the fourth region 84 from the wide absorbent body part 85w. Even if there is a tapered region whose width is narrowed continuously or stepwise toward the portion 84n, and the side edge of the tapered region of the absorbent body constricted portion 56n is formed parallel to the side edge of the tapered region of the outer shape constricted portion 70. good. In this way, the absorbent body constricted portion 56n is also provided with a gradually decreasing region similar to the outer shape constricted portion 70, and the side edges of the gradually decreasing region of the absorbent body constricted portion 56n are formed parallel to the side edges of the gradually decreasing region of the outer shape constricted portion 70. This is preferable because it facilitates good leg posture as described above and makes it particularly difficult for the wearer's legs to contact the side edges of the absorber 56 when the wearer is in the good leg position. If necessary, such as when the contour constricted portion 70 has a shape symmetrical with respect to an imaginary straight line extending in the width direction WD through the center of the front-rear direction LD, the absorber constricted portion 56n may also extend in the front-rear direction LD symmetrical with respect to an imaginary straight line extending in the width direction WD through the center of the (of course, it may be asymmetrical in the front-rear direction). 8 denotes the width of the narrowest portion 84n in the fourth region 84, w5 denotes the width of the wide absorbent body portion 85w in the fifth region 85, and 86n denotes The narrowest portion of the sixth region 86 (whose width is equal to the width w4 of the narrowest portion 84n of the fourth region 84) is shown.

(Getting up gathers)
In order to block excrement moving laterally along the top sheet 30 and prevent so-called lateral leakage, the surface of the top sheet 30 is provided with rise gathers 60 on both sides in the width direction WD. preferable. The rising gathers 60 can also be omitted.

The rising gathers 60 are composed of a root portion 65 attached outside the width direction WD of an imaginary line 60B extending in the front-rear direction LD through blocking positions on both sides of the surface of the top sheet 30 in the width direction WD, and a body portion 66 extending inward in the width direction WD without being folded back from the inner edge of the body portion 66; The body portion 66 has a front end portion 67 and a rear end portion 69 having a fixing portion BP fixed to the top sheet 30 (in other words, the range of the body portion 66 in the front-rear direction LD having the fixing portion BP is the front end portion 67). and a rear end portion 69), and an intermediate portion 68 positioned between the front end portion 67 and the rear end portion 69 and not fixed to the top sheet 30. At least the tip portion of the intermediate portion 68 is attached with an elongated gather elastic member 63 extending in the front-rear direction LD.

The body portion 66 and the base portion 65 are folded in two at the tip of the body portion 66 (the end opposite to the side of the base portion 65) to form a two-layer structure of the inner layer 62n and the outer layer 62f. can be formed by In this case, a gather elastic member 63 can be provided between the inner layer 62n and the outer layer 62f. The inner layer 62n may extend to the base portion 65 as shown in FIG. 3, or may extend only to an intermediate position in the width direction WD of the main body portion 66 (not shown). In other words, the body portion 66 may have a single layer portion on the base portion 65 side. Also, the gather sheet 62 may have a layered structure of three or more layers, and in particular may have a liquid-impermeable film as an intermediate layer. When the gather sheet 62 has a multi-layer structure, the number of layers may be increased by attaching another nonwoven fabric without folding one sheet of nonwoven fabric or by folding one sheet of nonwoven fabric to increase the number of layers. .

The root portion 65 has a joining start end in the width direction WD on the side portion of the top sheet 30, and this joining start end continues in the front-rear direction LD through the blocking position. In addition, the root portion 65 of the illustrated example has an extending portion that extends outward in the width direction WD from the top sheet 30, and this extending portion corresponds to the inner surface of each side flap portion SF, that is, the illustrated example. In , the liquid-impermeable sheet 11 is joined to the side portion thereof and to the side portion of the exterior nonwoven fabric 12 positioned outside in the width direction WD thereof by a hot-melt adhesive or the like.

Although fixed portions BP fixed to the surface of the top sheet 30 are provided at both ends of the main body portion 66 in the front-rear direction LD, an intermediate portion 68 positioned between the front and rear fixed portions BP is fixed to the surface of the top sheet 30. This is the part that is not. The intermediate portion 68 is contracted together with the gathers elastic member 63 due to the contraction force of the gathers elastic member 63 and is expandable together with the gathers elastic member 63 . As a result, in the attached state, the contractile force of the gather elastic member 63 shortens the dimension of the tip of the intermediate portion 68 in the front-rear direction LD, and the intermediate portion 68 is not fixed to the top sheet 30. As shown in FIG. 9, the height of the intermediate portion 68 increases as it approaches the tip (the portion farthest from the base portion 65 side), and the height decreases as it approaches the fixing portion BP of the front end portion 67 and the rear end portion 69. get up.

The type of the gather sheet 62 is not particularly limited, but in general, a water-repellent nonwoven fabric is used from the viewpoint of touch and liquid barrier properties. In particular, a nonwoven fabric having a meltblown layer between spunbond layers (SMS nonwoven fabric, SMMS nonwoven fabric, SSMS nonwoven fabric, SSMMS nonwoven fabric) is preferable in that both good texture and liquid impermeability can be achieved. The non-woven fabric can be used singly or in multiple layers. In the latter case, it is preferable to bond the nonwoven fabrics together with a hot-melt adhesive or the like.

As the gather elastic member 63, an elastic member such as a thread-like, string-like, belt-like, and elongated elastic member such as rubber can be used. The gather elastic member 63 may be provided on each side only one as in the illustrated example, or may be provided on each side in plural. The elongation rate of the gather elastic member 63 in the unfolded state can be appropriately determined, but is preferably about 150 to 250%, more preferably 180 to 230%. When synthetic thread rubber such as spandex is used as the gathering elastic member 63, its thickness is preferably 300 to 700 dtex, more preferably 400 to 500 dtex.

As shown in FIG. 9, a free portion FP that is not fixed to the top sheet 30 continues from the intermediate portion 68 to the inner end portions in the width direction WD of the front end portion 67 and the rear end portion 69 of the main body portion 66 . It is preferable that the fixed portion BP is provided in the body portion 66 other than the free portion FP (the free portion FP may be omitted). The width x1 of the free portion FP is 1/6 to 1/3 of the width x2 of the intermediate portion 68, and the dimension of the free portion FP in the front-rear direction LD is 1 to 9.5 of the width x1 of the free portion FP. has doubled. Although the width x1 of the free portion FP is constant in the illustrated example, it may vary depending on the position in the front-rear direction LD, in which case it means the minimum value. Although the width x2 of the intermediate portion 68 is constant in the illustrated example, it may vary depending on the position in the front-rear direction LD, in which case it means the maximum value.

In such an inward rising gather 60, as shown in FIG. 10, the front and rear fixed portions BP suppress the rising of the intermediate portion 68 in the worn state, but the degree of suppression varies depending on the rising of the free portion FP (the intermediate portion). 68, but does not rise as much as the intermediate portion 68 because the width x1 of the free portion FP is short). Become. In addition, due to the presence of the free portion FP, as shown in FIG. 11, the tip of the intermediate portion 68 can easily move in the width direction WD. Become.

The dimensions of the free portion FP can be appropriately determined within the range described above. The width x1 of the free portion FP is particularly preferably 2/11 to 1/4 of the width x2 of the intermediate portion 68. FIG. More specifically, the lower limit of the width x1 of the free portion FP is preferably 3.5 mm. Further, when both the front end portion 67 and the rear end portion 69 have the free portion FP, the width x1 of the free portion FP of the front end portion 67 and the width x1 of the free portion FP of the rear end portion 69 may be equal. Since the range of motion of the leg is larger on the front side than on the rear side, the width x1 of the free portion FP of the front end portion 67 of the body portion 66 is made wider than the width x1 of the free portion FP of the rear end portion 69 (for example, 1.2 to 1.2 mm). .5 times) is one preferred embodiment.

It is more preferable that the dimension y1 of the free portion FP in the longitudinal direction LD is 2 to 8.5 times the width x1 of the free portion FP. As in the example shown in FIG. 1, the free portion FP extends over the entire length of the front end portion 67 when provided at the front end portion 67 of the main body portion 66, and at the rear end portion when provided at the rear end portion 69 of the main body portion 66. 69 is preferably provided over its entire length. However, when the free portion FP is provided at the front end portion 67, as shown in FIG. 12, the free portion FP is provided only on the rear side of the front end portion 67, and the front side of the front end portion 67 is the fixed portion BP over the entire width direction WD. can also Similarly, when the free portion FP is provided at the rear end portion 69, as shown in FIG. It can also be a part BP. As can be seen from this, when the free portion FP is provided at both the front end portion 67 and the rear end portion 69 of the main body portion 66, the dimension of the free portion FP of the front end portion 67 in the front-rear direction LD and the free portion of the rear end portion 69 are The dimensions of the FP in the longitudinal direction LD may be equal to or different from each other. The free portion FP is preferably provided on both the front end portion 67 and the rear end portion 69 of the main body portion 66 as shown in the figure, but may be provided only on the front end portion 67 or only on the rear end portion 69 .

Unlike the illustrated example, the gather elastic member 63 may be provided at a portion other than the distal end portion of the intermediate portion 68. It is preferable not to have the gather elastic member 63 in areas other than the area because the portion having the gather elastic member 63 is less likely to come into tight contact with the skin.

Also, the gather elastic member 63 may extend to the free portion FP, or may not extend to the free portion FP. In the former case, the portion of the gathers elastic member 63 located in the free portion FP may be fixed to the free portion FP, and the contractile force of the gathers elastic member 63 may act on the free portion FP. The portion positioned in the free portion FP may not be fixed to the free portion FP, and the contractile force of the gather elastic member 63 may not act on the free portion FP.

(Inside plane gather)
As shown in the illustrated example, an elongated inside along the front-rear direction LD is located on the back side of the top sheet 30 in the base portion side region equal to the width x3 of the fixing portion BP in the region overlapping the back side of the intermediate portion 68 in the unfolded state. An elastic member 61 is provided, and the root side region is contracted together with the inside elastic member 61 by the contractile force of the inside elastic member 61, and is extensible together with the inside elastic member 61 (so-called planar gathers). ) and preferred. By providing such an inside elastic member 61, the portion having the inside elastic member 61 is lifted in the direction indicated by the white arrow in FIGS. can be tilted (this situation is not represented in FIGS. 10 and 11). The inside elastic member 61 can also be omitted.

The position of the inside elastic member 61 can be appropriately determined within the range described above. As an example, the position of the inside elastic member 61 in the width direction WD is preferably within 10 mm, particularly within 7.5 mm in the width direction WD from the blocking position (the boundary between the base portion 65 and the intermediate portion 68). Further, when the position of the front end of the product in the front-rear direction LD is 0% and the position of the rear end of the product is 100%, the front end of the portion that expands and contracts by the inside elastic member 61 is located in the range of 20 to 30%. It is preferable that the rear end of the portion that expands and contracts by the member 61 is positioned within the range of 20 to 30%. When a constricted portion 56n having a narrower width than both front and rear sides thereof is formed in the middle of the absorber 56 in the front-rear direction LD (in particular, the range in the front-rear direction LD including the crotch portion M) as in the illustrated example, the inside The elastic member 61 is preferably arranged so as to pass through the constricted portion 56n. Since the constricted portion 56n is a portion that does not have the absorber 56, it has lower rigidity than the portion that has the absorber 56 and is easily deformed. Therefore, if the inside elastic member 61 is provided so as to pass through this position, the base portion of the rising gathers 60 is more likely to be inclined.

The inside elastic member 61 can be provided between the packaging sheet 58 and the liquid-impermeable sheet 11 , and can also be provided between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 . Only one inside elastic member 61 may be provided on each side as in the illustrated example, or a plurality of inside elastic members 61 may be provided on each side at intervals in the width direction.

As the inside elastic member 61, an elastic member such as a thread-like, string-like, belt-like, and elongated rubber can be used. Only one inside elastic member 61 may be provided on each side as in the illustrated example, or a plurality of inside elastic members 61 may be provided on each side. The elongation rate of the inside elastic member 61 in the unfolded state can be appropriately determined, but is preferably about 160 to 240%, more preferably 180 to 220%. When synthetic thread rubber such as spandex is used as the inside elastic member 61, its thickness is preferably 400 to 700 dtex, more preferably 500 to 650 dtex.

The contractile force acting portion of the inside elastic member 61 (the portion where the inside elastic member 61 is illustrated in the figure) may be the same as or shorter than the portion where the inside elastic member 61 exists. In other words, the inside elastic member 61 exists on the front side, the rear side, or both sides of the contractile force acting portion of the inside elastic member 61, but the inside elastic member 61 is not fixed to the sheets sandwiching the inside elastic member 61 except for the contractile force acting portion. Or, the inside elastic member 61 is finely cut at one place or multiple places, or both, so that the contractile force does not act (substantially, it is equivalent to not providing the elastic member). , the portion where the contractile force is applied may be shorter than the portion where the inside elastic member exists.

(Outside plane gather)
An elongated outside elastic member 64 is attached along the front-rear direction LD to a side region located between the side edge of the outer shape constricted portion 70 and the side edge of the absorber constricted portion 56n, and each side region has an outside elastic member. It may be contracted together with the outside elastic member 64 by the contractile force of the member 64 and may be stretchable together with the outside elastic member 64 (so-called planar gathers may be formed). The outside elastic member 64 can also be omitted.

The outside elastic member 64 is provided between the gather sheet 62 and the liquid-impermeable sheet 11 as shown in the figure, and also provided between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 in the side flap portion SF. can also Only one outside elastic member 64 may be provided on each side as in the illustrated example, or a plurality of outside elastic members 64 may be provided on each side at intervals in the width direction.

As the outside elastic member 64, an elastic member such as a thread-like, string-like, belt-like, and elongated rubber can be used. Only one outside elastic member 64 may be provided on each side as in the illustrated example, or a plurality of outside elastic members 64 may be provided on each side. The elongation rate of the outside elastic member 64 in the unfolded state can be appropriately determined, but is preferably about 170-250%, more preferably 190-230%. When synthetic thread rubber such as spandex is used as the outside elastic member 64, its thickness is preferably 400 to 700 dtex, more preferably 500 to 650 dtex.

The contractile force acting portion of the outside elastic member 64 (the portion where the outside elastic member 64 is illustrated in the figure) may be the same as or shorter than the portion where the outside elastic member 64 exists. That is, the outside elastic member 64 exists on the front side, the rear side, or both sides of the contractile force acting portion of the outside elastic member 64, but is fixed to the sheets sandwiching the outside elastic member 64 except for the contractile force acting portion. or the outside elastic member 64 is finely cut at one or a number of locations, or both, the contractile force does not act (substantially, the elastic member is not provided). ), the contraction force acting portion may be shorter than the portion where the outside elastic member 64 exists.

In order to improve the fit in the good leg position, the width w6 between the side edge of the narrowest portion 71n in the first region 71 and the outside elastic member 64 in the width direction WD is 0 to 5 mm, The front end of the outside elastic member 64 is preferably located between the front end of the constricted portion 70 and the narrowest portion 71n in the first region 71, and is located at the narrowest portion 71n in the first region 71. It is particularly preferable to be located in the range of 10 to 20 mm on the front side of the .

<Description of terms in the specification>
When the following terms are used in the specification, they shall have the following meanings, unless stated otherwise in the specification.

"MD direction" and "CD direction" mean the flow direction (MD direction) and the lateral direction (CD direction) perpendicular to this in the manufacturing equipment, one of which is the front-back direction LD of the product. , and the other is the width direction WD of the product. The MD direction of a nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. The fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned. It can be determined by a simple measurement method that determines the fiber orientation direction from the

・"Front-back direction" means the direction (longitudinal direction) indicated by symbol LD in the figure, and "width direction" means the direction (left-right direction) indicated by WD in the figure. It is orthogonal to WD.

- The "front side" means the side closer to the wearer's skin when worn, and the "back side" means the side farther from the wearer's skin when worn.

- "Front" means the side of the member that is closer to the wearer's skin when worn, and "back" means the side that is farther from the wearer's skin when worn.

The "deployed state" means a state of being flatly unfolded without contraction (including any contraction such as contraction due to an elastic member) or slack.

"Elongation rate" means a value when the natural length is taken as 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

"Artificial urine" contains urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and deionized water: 97 wt%. 09 wt% and used at a temperature of 37°C unless otherwise specified.

"Gel strength" is measured as follows. 1.0 g of superabsorbent polymer is added to 49.0 g of artificial urine and stirred with a stirrer. The resulting gel is left in a constant temperature and humidity bath at 40° C. and 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).

"Matsuke" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1° C., relative humidity 50±2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.

"Thickness" is automatically measured using an automatic thickness gauge (KES-G5 handy compression tester) under the conditions of a load of 0.098 N/cm ² and a pressurized area of 2 cm ² .

"Water absorption" is measured according to JIS K7223-1996 "Testing method for water absorption of superabsorbent resin".

"Water absorption rate" is defined as "Time to end point" when JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymer" is performed using 2g of superabsorbent polymer and 50g of physiological saline. do.

Unless otherwise specified, the dimension of each part means the dimension in the unfolded state, not in the natural length state.

Unless otherwise specified, the test or measurement shall be conducted in a laboratory or equipment under standard conditions (temperature of 23±1°C, relative humidity of 50±2%). .

INDUSTRIAL APPLICABILITY The present invention is suitable for connecting disposable diapers for low birth weight infants, but can also be used for connecting disposable diapers for infants and adults other than low birth weight infants.

DESCRIPTION OF SYMBOLS 11... liquid impermeable sheet, 12... exterior nonwoven fabric, 12T... target part, 13... connection tape, 13A... connection part, 30... top sheet, 50... absorption element, 56... absorber, 56n... absorber neck part, 58... Wrapping sheet 60... Raising gather 61... Inside elastic member 62... Gather sheet 62f... Outside layer 62n... Inside layer 63... Gather elastic member 64... Outside elastic member 65... Base part 66 Main body part 67 Front end part 68 Intermediate part 69 Rear end part BP Fixed part FP Free part LD Front-back direction M Crotch part WD Width direction F Abdominal part , B... dorsal portion 70... contour constricted portion 71... first region 72... second region 73... third region 71n... narrowest portion 72w... wide contour portion 84... fourth region , 85... Fifth region, 85w... Absorbent wide region, 86... Sixth region.

Claims (8)

a ventral portion extending forward from the center in the front-rear direction;
a dorsal portion extending rearward from the center in the front-rear direction;
an outline constricted portion narrower than both front and rear sides provided from the middle of the ventral portion in the front-rear direction to the middle of the dorsal portion in the front-rear direction;
an absorber provided from the middle of the abdominal portion in the front-rear direction to the middle of the back portion in the front-rear direction;
an absorbent body constricted portion provided in the middle of the absorbent body in the front-rear direction and having a width narrower than both front and rear sides;
connecting portions provided on both sides of the dorsal portion and detachably connected to the ventral portion;
When the outer shape constricted portion is divided into thirds in order from front to back into a first region, a second region and a third region, the first region has the narrowest portion in the outer shape constricted portion, The second region has a wide outline portion that is wider than the narrowest portion in the first region and the narrowest portion in the third region,
The contour constricted portion has a gradually decreasing region in which the width narrows continuously or stepwise from the wide contour portion to the narrowest portion in the first region,
The width of the wide outer shape portion is 2.2 to 3.5 times the width of the narrowest portion of the constricted portion of the absorbent body,
The width of the narrowest portion in the first region is 2.0 to 3.3 times the width of the narrowest portion in the absorbent body constricted portion.
A connected disposable diaper characterized by: The dimension of the outer shape constricted portion in the front-rear direction is 2.5 to 4.0 times the width of the narrowest portion of the absorbent body constricted portion,
The dimension in the front-rear direction of the constricted portion of the absorbent body is 0.5 to 0.7 times the dimension in the front-rear direction of the constricted portion of the outer shape,
The absorbent body constricted portion is located on the rear side of the narrowest portion of the first region,
The articulated disposable diaper according to claim 1. An elongated outside elastic member is attached along the front-rear direction to a side region positioned between a side edge of the outer shape constricted portion and a side edge of the absorber constricted portion,
The side region is contracted together with the outside elastic member due to the contractile force of the outside elastic member, and is expandable together with the outside elastic member,
a widthwise interval between the side edge of the narrowest portion of the first region and the outside elastic member is 5 to 10 mm;
The front end of the outside elastic member is positioned between the front end of the constricted portion and the narrowest portion of the first region,
The connectable disposable diaper according to claim 1 or 2. At least the side edges of the entire second region and the portion extending from the front end thereof to the narrowest portion of the first region have a center of curvature located on the opposite side of the side edge, and are the narrowest part of the absorbent body constricted portion. has an arc shape with a radius of curvature of 3.0 to 7.0 times the width of the narrow part of
The connectable disposable diaper according to any one of claims 1 to 3. The contour constricted portion has a shape that is symmetrical with respect to an imaginary straight line that passes through the center in the front-rear direction and extends in the width direction.
The connectable disposable diaper according to any one of claims 1 to 4. When the constricted portion of the absorbent body is divided into thirds in order from front to back into a fourth region, a fifth region, and a sixth region, the fourth region has the narrowest portion in the constricted portion of the absorbent body, The fifth region has a wide absorbent body region wider than the narrowest region in the fourth region and the narrowest region in the sixth region,
The absorbent body constricted portion has a gradually decreasing region in which the width narrows continuously or stepwise from the wide absorbent body region to the narrowest region in the fourth region,
The side edge of the tapered region of the absorbent body constricted portion is formed parallel to the side edge of the tapered region of the contour constricted portion,
The connectable disposable diaper according to any one of claims 1 to 5. a liquid-permeable top sheet arranged on the front side of the absorbent;
and riser gathers respectively provided on both sides in the width direction of the surface of the top sheet,
The rising gathers are formed from a base portion attached to the outside in the width direction of an imaginary line continuing in the front-rear direction through blocking positions on both sides in the width direction of the surface of the top sheet, and an inner edge in the width direction of the base portion. a main body extending inward in the width direction without being folded back;
The main body portion has a front end and a rear end having a fixed portion fixed to the top sheet, and an intermediate portion located between the front end and the rear end and not fixed to the top sheet. death,
An elongated gathered elastic member extending in the front-rear direction is attached to at least the tip of the intermediate portion,
the intermediate portion is contracted together with the gathers elastic member due to the contraction force of the gathers elastic member, and is expandable together with the gathers elastic member;
A free portion that is not fixed to the top sheet is provided at an inner end portion in the width direction of at least one of the front end portion and the rear end portion so as to continue from the intermediate portion. A fixed portion is provided at the rear end portion other than the free portion,
The width of the free portion is 1/6 to 1/3 of the width of the intermediate portion, and the dimension of the free portion in the front-rear direction is 1 to 9.5 times the width of the free portion.
The connectable disposable diaper according to any one of claims 1 to 6. Disposable diapers for low birth weight babies,
The connectable disposable diaper according to any one of claims 1 to 7.

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