JP6546677B1 - Tape type disposable diaper - Google Patents

Abstract

An object of the present invention is to prevent an overhanging portion that bulges outward in a wavy portion from being folded between the surface of a diaper and the skin. SOLUTION: Lower edges 70 and 75 of a wing portion WP have a wave-like portion 80 having a plurality of ridges that swell outward, and side elasticities are formed closer to the center in the width direction than the wing portion WP in a side flap portion SF. The member 64 is provided, and a planar gather that is contracted in the front-rear direction LD by the side elastic member 64 is provided. The front-rear direction range in which the contracting force of the side elastic member 64 acts, It has an overlapping range 77 at least partially overlapping, and the maximum elongation of the planar gather is 150 to 350%. In the overlapping range 77, the width direction WD interval between the side elastic member 64 and the wavy portion 80 is The maximum is 15 to 50 mm, and the minimum is 5 to 20 mm. [Selected figure] Figure 7

Description

  The present invention relates to a tape-type disposable diaper with improved fit around the legs.

  There are three main types of disposable diapers: tape type, pant type and pad type. Among these, the tape-type disposable diaper is attached to the body in the unfolded state, and is then attached by connecting the connecting parts provided on the left and right sides of the back part to the outer surface of the ventral part.

  A general tape-type disposable diaper has a crotch including the center in the front-rear direction, a ventral portion extending forward from the center in the front-rear direction, and a back portion extending rearward from the center in the front-rear direction. The wing portion extending to the left and right in the width direction more than the crotch, and the ventral portion and the dorsal portion have an intermediate portion located between the left and right wing portions, and the wing portion is the outer surface of the ventral portion And a connecting portion that is detachably connected to the In use, the wing portion is turned from both sides of the waist to the outer surface of the ventral portion to connect the junction of the wing portions to the outer surface of the ventral portion. Such a tape-type disposable diaper is used not only for infants but also for nursing care (for adults).

  Conventionally, as a tape-type disposable diaper, an integral type in which a side flap extending laterally from the side edge of the absorber is cut along the circumference of a leg, and an uncut portion is left as a wing (eg, a patent) In addition to documents 1 to 3), separately manufactured connecting tapes are attached to the side edge of the main body forming the middle part, and this connecting tape becomes a wing part (see, for example, patent documents 4 and 5) Are known. In addition, as a separate type, one in which a unit including left and right wing portions is attached to a main body forming an intermediate portion is also proposed (see, for example, Patent Document 6).

  However, in the conventional tape-type disposable diaper, when the wearer bends the thigh, the upper front surface of the thigh may come into tight contact with the lower edge of the wing portion of the ventral portion. In particular, although products of this type generally correspond to a range of body sizes in one size, the wearer bends the thigh as the upper limit is approached, even within the fit range. It has been found that the upper front surface of the thigh easily comes into tight contact with the lower edge of the wing portion of the ventral portion.

  In order to solve such problems, the present inventor has developed a technique for providing a wavelike portion at the lower edge of the wing portion, and an overhang that bulges outward at the wavelike portion due to the movement of the leg. It was noticed that the part was folded between the surface of the diaper and the skin and not only the aesthetics were lost, but also the leakage and the feeling of wearing might be deteriorated.

JP, 2016-174816, A JP, 2013-212213, A JP, 2013-212210, A Unexamined-Japanese-Patent No. 2010-22550 Unexamined-Japanese-Patent No. 2010-119463 JP 2011-72736 A

  Then, the main subject of this invention is to prevent that the overhanging part which bulges outside in a wavelike part is folded in between the surface and the skin of a diaper.

The various aspects of the tape type disposable diaper which solved the said subject are as follows.
<First aspect>
A ventral 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 crotch portion between the ventilating portion and the back portion ;
It has an absorber incorporated in the range including the crotch part,
The ventral portion and the dorsal portion, the side edges has a wing portion extending out outward in the width direction than the side edge of the crotch portion,
In both sides of the back portion, there are provided connecting tapes for detachably connecting the ventral portion.
In the tape type disposable diaper,
The lower edges of the wing portions of the ventral portion respectively extend so as to be positioned diagonally outward toward the front,
The lower edges of the wing portions of the back portion respectively extend so as to be positioned diagonally outward toward the rear,
The lower edge of the wing portion of at least one of the ventral portion and the dorsal portion has a corrugated portion having a plurality of outwardly bulging peaks,
It has a side flap part which does not have an absorber on both sides in the width direction from the ventral part to the dorsal part,
A side elastic member is provided in the front-rear direction on the widthwise center side of the wing portion in the side flap portion, and a flat gathers shrunk in the front-rear direction is formed by the side elastic member,
There is an overlapping range in which the longitudinal range in which the contraction force of the side elastic member acts and at least a part of the longitudinal range of the wavelike portion overlap.
The maximum elongation of the flat gather is 150 to 350%,
In the overlapping range, the width direction distance between the side elastic member and the corrugated portion, the maximum being 18 to 25 mm, and Ri minimum 10 to 17 mm der,
The wavelike portion has a maximum value of 3 to 10 mm and a wavelength of 10 to 20 mm, respectively.
The side edge of the crotch portion extends linearly in the front-rear direction ,
Tape-type disposable diapers characterized by

(Action effect)
As in this embodiment, the overlapping range is provided between the side elastic member and the wavelike portion, and the distance between the wavelike portion and the side elastic member in the overlapping range and the maximum elongation of the flat gather are within the specific range. The bulging overhanging portion is less likely to be folded between the surface of the diaper and the skin. In addition, frills excellent in aesthetics are formed in the wavy portion, which gently undulates in the thickness direction. In particular, combining such frills with the shape of the undulations also offers the advantage of further enhancing the frill's aesthetics. On the other hand, when the distance between the wavy portion and the side elastic member is too short, or the maximum expansion of the flat gather is too large, not only the frilliness is reduced due to the frill wave becoming finer, but also the touch is hard May be In addition, if the distance between the wavy portion and the side elastic member is too long, the overhanging portion that bulges outward in the wavy portion may be folded between the surface of the diaper and the skin, which may lead to leakage or deterioration of the wearing feeling. On the other hand, if the distance between the wavy portion and the side elastic member is too long or the maximum elongation of the flat gathers is too small, the formation of frills may be insufficient. In addition, the maximum elongation means the maximum value of the elongation in the expansion and contraction direction (in other words, the expansion in the unfolded state where the flat gathers unfold flatly without contraction or slack), and the unfolded state is 100% of the natural length. Expressed as a percentage of

  Note that the wavy portion does not matter whether the direction of the wave is linear or curvilinear, and where the center line of all amplitudes (peak-to-peak) passes. In addition, the wavelike part is a combination of a sine curve and a circular arc, those whose amplitude and wavelength change in the direction in which the wave continues, and those where the bottom of the wave is pointed (bent) like a cloud, etc. Includes both regular and irregular shapes.

  In the usual case, it is preferable that the size of the wavy portion be within the range of this embodiment. In particular, if the total amplitude of the wave-like portion is too large, the overhanging portion may be folded between the surface of the diaper and the skin, which may lead to leakage or deterioration of the wearing feeling.

< Other aspects>
The said wavelike part is a tape type disposable diaper in which full amplitude increases in steps or continuously as the crotch side is approached.

(Action effect)
The lower edge of the wing portion extends obliquely outward toward the front, so the widthwise distance between the wavy portion and the side elastic member in the overlapping area becomes shorter as it approaches the crotch, and the wavy portion The frills that are formed become finer. Here, if the total amplitude of the wave-like portion is small, the shape of the wave-like portion tends to be inconspicuous. On the other hand, it is preferable that the entire amplitude of the wavelike portion increases as it approaches the crotch as in the present embodiment, because the shape of the wavelike portion is easily noticeable.

<Another embodiment>
The tape type disposable diaper, wherein both side edges of the crotch extend rectilinearly in a direction inclining toward the front by 1 to 2 degrees.

(Action effect)
As in the present embodiment, when the width of the crotch becomes narrower toward the front, the thigh becomes easier to move forward, so the wings of the upper front and ventral side of the thigh when the thigh is bent The fit with the lower edge of the part is better. The crotch is susceptible to leg movement. For this reason, if both side edges of the crotch part are in a wave shape, the overhanging part may be folded between the surface of the diaper and the skin, which may lead to leakage or deterioration of the wearing feeling. Therefore, it is preferable that both side edges of the crotch portion be linear unlike the lower edge of the wing portion.

  According to the present invention, an advantage is provided such that it is possible to prevent an outwardly bulging overhanging portion in the waved portion from being folded between the surface of the diaper and the skin.

It is a top view in the state where the diaper was developed showing the inside of a tape type disposable diaper. It is a top view in the state where a diaper was developed showing the outer surface of a tape type disposable diaper. It is line 6-6 in FIG. 1 sectional drawing. 7 is a cross-sectional view taken along line 7-7 of FIG. (A) It is the 8-8 line sectional view of FIG. 1, and (b) It is a 9-9 line sectional view of FIG. It is line 5-5 in FIG. 1 sectional drawing. It is a principal part enlarged plan view of (a) ventral part and (b) back part. It is a principal part enlarged plan view of (a) back side part, and (b) ventral side part. It is a principal part enlarged plan view of (a) back side part, and (b) ventral side part. It is a top view in the state where a diaper was developed showing the outer surface of a tape type disposable diaper.

  1 to 6 show an example of a tape-type disposable diaper, where the symbol X in the figure indicates the full width of the diaper excluding the connecting tape, the symbol L indicates the total length of the diaper, and in the cross-sectional view The dotted portions indicate hot melt adhesives as joining means for joining the components located on the front side and the back side. The hot melt adhesive can be formed by a known method such as slot coating, continuous linear or dotted bead coating, spiral or Z-like spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). It can be applied. Alternatively or additionally, the hot melt adhesive can be applied to the outer peripheral surface of the elastic member at the fixing portion of the elastic member to fix the elastic member to the adjacent member. As the hot melt adhesive, for example, those of EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type, etc. exist, but they can be used without particular limitation. As a joining means for joining the respective constituent members, means by material welding such as heat sealing or ultrasonic sealing can be used.

  This tape type disposable diaper has an abdominal side portion F extending forward from the center in the front-rear direction LD and a back side portion B extending rearward from the center in the front-rear direction LD. Moreover, this tape type disposable diaper has a liquid-permeable top sheet 30 that covers the front side of the absorber 56, a liquid-impervious property that covers the rear side of the absorber 56, and a liquid-permeable top sheet 30 that covers the front side of the absorber 56. A sheet 11 and an exterior nonwoven fabric 12 covering the back side of the liquid impermeable sheet and constituting the outer surface of the product are provided.

Hereinafter, the material and the characteristic part of each part will be described in order.
(Absorber)
The absorber 56 is a portion that absorbs and holds waste fluid, and can be formed by an assembly of fibers. As this fiber assembly, a filament assembly obtained by opening as needed a fiber (a fiber bundle) of synthetic fibers such as cellulose acetate in addition to those obtained by stacking short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber weight may be, for example, about 100 to 300 g / m ² in the case of stacking cotton-like pulp or short fibers, and in the case of filament aggregate, for example, about 30 to 120 g / m ^2. Can. The fineness in the case of a synthetic fiber is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but are preferably crimped fibers. The crimp degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably 15 to 50 per 2.54 cm. In addition, crimped fibers that are uniformly crimped can be used.

(Superabsorbent polymer particles)
The absorbent body 56 may contain superabsorbent polymer particles in part or all thereof. The superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are. The particle size of the superabsorbent polymer particles is not particularly limited. For example, sieving (shake for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006), and particles falling under the sieve in this sieving Standard sieve of 180 μm with less than 30% by weight of particles remaining on the standard sieve of 500 μm when sifting (shake for 5 minutes) using 180 μm of standard sieve (JIS Z8801-1: 2006) It is desirable that the proportion of particles remaining above is 60% by weight or more.

  The material of the superabsorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Examples of the superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based particles, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and crosslinked sodium carboxymethyl cellulose. A thing, an acrylic acid (salt) polymer, etc. can be used. The shape of the superabsorbent polymer particles is preferably in the form of commonly used powdery particles, but other shapes may 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 suitably used. If the water absorption rate is too slow, so-called reversion in which the liquid supplied into the absorber 56 returns out of the absorber 56 tends to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are suitably used. Thereby, even in the case of the bulky absorber 56, it is possible to effectively suppress the sticky feeling after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined in accordance with the absorption required for the application of the absorber 56. Therefore, although it can not generally say, it can be 50-350 g / m < ² >. If the basis weight of the polymer is less than 50 g / m ² , it will be difficult to secure the absorption amount. When it exceeds 350 g / m ² , not only the effect is saturated but also the excess of the superabsorbent polymer particles gives a jagged feeling.

(Packaging sheet)
The absorbent 56 can be incorporated as an absorbent element 50 which is wrapped in a packaging sheet 58 in order to prevent the superabsorbent polymer particles from coming out or to improve the shape maintenance of the absorbent 56. As the packaging sheet 58, tissue paper, in particular, 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 it is a sheet from which the superabsorbent polymer particles can not escape. When a non-woven fabric is used instead of crepe paper, a hydrophilic SMMS (spun bond / melt blown / melt blown / spun bond) non-woven fabric is particularly preferable, and polypropylene, polyethylene / polypropylene, etc. can be used as its 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 has a structure that wraps the whole of the absorber 56 in one sheet, or may wrap the whole of the absorber 56 in a plurality of sheets such as upper and lower two sheets etc. 58 can be omitted.

(Top sheet)
The top sheet 30 has liquid permeability, and for example, a non-porous or non-porous non-woven fabric, a porous plastic sheet, or the like can be used. Moreover, among these non-woven fabrics, the raw material fibers are not particularly limited. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc., mixed fibers of which two or more are used, composite fibers Etc. can be illustrated. Furthermore, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as spun lace method, spun bond method, thermal bond method, melt blown method, needle punch method, air through method, point bond method and the like. For example, the thermal bonding method is a preferable processing method if the spun lace method requires bulkiness and softness if flexibility and drape are required.

  The top sheet 30 extends from the front end to the rear end of the product in the front-rear direction and extends more laterally than the absorber 56 in the width direction WD. For example, the starting point of the rising gather 60 described later is more than the side edge of the absorber 56 In the case of being positioned on the center side in the width direction, appropriate modifications can be made, such as making the width of the top sheet 30 shorter than the entire width of the absorber 56, if necessary.

(Intermediate sheet)
In order to rapidly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a “second sheet”) 40 can be provided, which has a higher liquid permeation rate than the top sheet 30. The intermediate sheet 40 is used to rapidly transfer the liquid to the absorber to enhance the absorption performance of the absorber, and to prevent the phenomenon of "reversion" of the absorbed liquid from the absorber. The intermediate sheet 40 can be omitted.

As the intermediate sheet 40, the same material as the top sheet 30, a spunlace nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a pulp nonwoven fabric, a mixed sheet of pulp and rayon, a point bond nonwoven fabric or a crepe paper can be exemplified. In particular, an air through non-woven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber as 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. Basis weight is preferably ^{17~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the non-woven material fiber is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, eccentric and hollow fibers as mixed fibers of all or part of the raw material fibers.

  The intermediate sheet 40 in the illustrated example is disposed at the center shorter than the width of the absorber 56, but may be provided over the entire width. Moreover, although the intermediate sheet 40 may be provided over the full length of a diaper, you may provide only in the intermediate part containing a discharge position like the example of illustration.

(Liquid impervious sheet)
The liquid impermeable sheet 11 is not particularly limited, but is preferably one having moisture permeability. The liquid impermeable sheet 11 is, for example, a microporous obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet can be used suitably. In addition, as the liquid impermeable sheet 11, a sheet having a non-woven fabric as a base material and having enhanced waterproofness can also be used.

  It is desirable that the liquid impermeable sheet 11 extends the same as or wider than the absorber 56 in the longitudinal direction LD and the width direction WD, but if necessary, such as when other water blocking means are present, The end portion of the absorber 56 may not be covered 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 and makes the outer surface of the product look like a cloth. The external nonwoven fabric 12 is not particularly limited, and examples of raw fibers include synthetic fibers such as olefins, polyesters, and polyamides such as polyethylene and polypropylene, regenerated fibers such as rayon and cupra, and natural fibers such as cotton. As the processing method, spun lace method, spun bond method, thermal bond method, air through method, needle punch method and the like can be used. However, a long-fiber non-woven fabric such as a spunbond non-woven fabric, an SMS non-woven fabric, or an SMMS non-woven fabric is preferable from the viewpoint of achieving both touch and strength. Nonwoven fabrics can be used alone or in combination of multiple sheets. In the latter case, it is preferable to bond the non-woven fabrics together with a hot melt adhesive or the like. When a non-woven fabric is used, its fiber basis weight is preferably 10 to 50 g / m ² , particularly 15 to 30 g / m ² .

(Get up and gather)
In order to prevent excrement that moves laterally on the top sheet 30 and to prevent so-called side leakage, rising gathers 60 are provided on both sides in the width direction WD of the surface to stand on the skin side of the wearer Is preferable. Of course, the rising gather 60 can be omitted.

  When adopting the rising gather 60, the structure is not particularly limited, and any known structure can be adopted. The rising gather 60 of the illustrated example is constituted by a gather sheet 62 which is substantially continuous in the width direction WD, and an elongated gather elastic member 63 fixed to the gather sheet 62 in a stretched state along the longitudinal direction LD. ing. A water-repellent non-woven fabric can be used as the gather sheet 62, and a yarn rubber or the like can be used as the gather elastic member 63. A plurality of elastic members may be provided as shown in FIG. 1 and FIG. 2 or one each.

  The inner surface of the gather sheet 62 has a bonding start end in the width direction WD on the side portion of the top sheet 30, and the portion from the bonding start end in the width direction is the inner surface of each side flap portion SF, that is, liquid impervious in the illustrated example. The side of the elastic sheet 11 and the side of the exterior nonwoven fabric 12 located on the outer side in the width direction thereof are joined by a hot melt adhesive or the like.

  Around the legs, inside the width direction from the joint start end of the rising gather 60 is fixed on the top sheet 30 at both ends in the product longitudinal direction, but the portion between them is a non-fixed free portion, and this free portion is It stands up by the contraction force of the elastic member 63 and comes in close contact with the body surface.

(End flap, side flap)
In the illustrated tape type disposable diaper, a pair of end flaps EF not having the absorbent body 56 extending to the front side and the rear side of the absorbent body 56, respectively, and more laterally than both side edges of the absorbent body 56 Each has a pair of side flap parts SF which do not have the absorber 56 extended. The side flap portion SF may be made of a material (the exterior nonwoven fabric 12 or the like) continuous from the portion having the absorber 56 as in the illustrated example, or may be formed by attaching another material.

(Plane Gather)
To each side flap portion SF, a side elastic member 64 formed of an elongated elastic member such as thread rubber is fixed in a state of being extended along the longitudinal direction LD, whereby the leg circumference portion of each side flap portion SF Is configured as a flat gather. The leg-surrounding elastic member 64 is provided between the gather sheet 62 and the liquid impervious sheet 11 at the width direction outer side near the joint start end in the joint portion of the gather sheet 62 as in the illustrated example. It can also be provided between the liquid impermeable sheet 11 and the exterior nonwoven fabric 12 in SF. A plurality of leg elastic members 64 may be provided on each side as in the illustrated example, or only one may be provided on each side.

  The flat gather is a portion on which the contraction force of the side elastic member 64 acts (a portion in which the side elastic member 64 is illustrated). Therefore, the side elastic member 64 exists over the front side, the rear side or both sides of the flat gather in addition to the form in which the side elastic member 64 exists only in the flat gather side, but the side elastic member 64 exists outside the flat gather. If the member is finely cut at one or more locations, or not fixed to the sheet sandwiching the side elastic member 64, or both of them, a contraction force acts on the area other than the flat gathers. In addition, a structure in which the contraction force of the side elastic member 64 acts only on the area of the flat gather is also included (substantially equivalent to the absence of the elastic member).

(Concatenation tape)
Each side flap portion SF of the back portion B is provided with a connecting tape 13 which is detachably connected to the outer surface of the ventral portion F. When the diaper 10 is attached, the connecting tape 13 is turned from the both sides of the waist to the outer surface of the ventral portion F to connect the connecting portion 13A of the connecting tape 13 to the appropriate position of the ventral portion F outer surface.

  Although the structure of the connection tape 13 is not particularly limited, in the illustrated example, a tape attachment portion 13C fixed to the side flap portion SF, and a sheet base material forming the tape main portion 13B protruding from the tape attachment portion 13C A belly-side connecting portion 13A is provided at a widthwise intermediate portion of the tape main body 13B in the base material, and a tip end side of the connecting portion 13A is a picking portion.

  As the connecting portion 13A, in addition to the hook material (male material) of the mechanical fastener (surface fastener), an adhesive layer may be provided. The hook material has a large number of engaging projections on its connecting surface, and the shapes of the engaging projections are (A) reed-shaped, (B) J-shaped, (C) mushroom-shaped, (D) There are T-shaped, (E) double J-shaped (a shape in which the J-shaped ones are connected to each other), etc., but any shape may be used.

Moreover, as a sheet base material which forms from the tape attachment part 13C to the tape main-body part 13B, although a nonwoven fabric, a plastic film, a polylamination nonwoven fabric, paper, and these composite materials can be used, 1.0 to 3.5 dtex of fineness A spunbond nonwoven fabric, an air through nonwoven fabric, or a spunlace nonwoven fabric having a basis weight of 20 to 100 g / m ² and a thickness of 1 mm or less is preferable.

(Target sheet)
It is preferable to provide a target portion at the connection portion of the connection tape 13 in the ventral portion F. The target portion can be provided by sticking the target sheet 20 for facilitating connection to the outer surface of the ventral portion F as illustrated. When the connecting portion 13A is a hook material, the target sheet 20 may be provided with a large number of loop yarns on which the engaging projections of the hook material are entangled on the surface of a sheet substrate made of a plastic film or non-woven fabric. Moreover, in the case of an adhesive material layer, what carried out the peeling process to the surface of the sheet | seat base material which consists of a plastic film with a smooth surface which is rich in adhesiveness can be used. When the connection portion of the connection tape 13 in the ventral side portion F is made of non-woven fabric, for example, when the exterior non-woven fabric 12 is provided as in the illustrated example, the target sheet 20 is omitted and the hook material is used as fibers of the exterior non-woven fabric 12 It can also be entangled and connected. In this case, the target sheet 20 as a mark may be provided between the exterior nonwoven fabric 12 and the liquid impermeable sheet 11, and a mark may be printed on the outer surface of the exterior nonwoven fabric 12 or the liquid impermeable sheet 11.

(Wing part)
The present tape type disposable diaper has a crotch M which extends from the middle of the longitudinal direction LD of the abdominal side F to the middle of the longitudinal direction LD of the back side B as shown in FIGS. 1, 2 and 10 There is. Both side edges of the crotch M are portions passing through a range of ± 5 mm in a direction orthogonal to the center with a direction having an acute angle side crossing angle θ ₀ of less than ± 2 degrees with respect to the longitudinal direction LD preferable. Further, the ventral portion F and the dorsal portion B have wing portions WP extending outward in the width direction WD relative to the crotch portion M. The lower edge 70 of the wing portion of the ventral portion F extends diagonally outward from the front end of the side edge of the crotch portion M, and the lower edge 75 of the wing portion of the dorsal portion B is It extends so as to be positioned diagonally outward from the rear end of the side edge of the crotch M toward the rear. Although the side edge of the wing portion WP is straight in the illustrated example, the present invention is not limited thereto, and other known shapes may be employed. The dimension of the fore-and-aft direction LD of the crotch M can be determined as appropriate, but can be about 1.2 to 1.4 times the minimum width M _X of the crotch M. In the case of infants, the dimension M _Y of the crotch M in the front-rear direction LD is about 10 to 30 cm.

As shown enlarged in FIGS. 7A and 8B, the lower edge 70 of the wing portion WP of the ventral portion F is a first portion 71 located on the proximal end side of the wing portion WP; And a second portion 72 located on the tip side of the wing portion WP. The range excluding at least both ends of the first portion 71 (preferably the whole as illustrated) and the range excluding the at least both ends of the second portion 72 (preferably the whole as illustrated) are respectively recessed inward. It is preferable that it is the wavelike part 80 which has two or more valley parts. Corrugations 80 of the first portion 71, the obtuse angle side crossing angle theta ₁ between the tangent line D1 in contact with both the trough portion 83 adjacent to the longitudinal direction LD is in 160-175 degrees (preferably 163-170 degrees) preferable. Corrugations 80 of the second portion 72, the obtuse angle side crossing angle theta ₂ between the tangent line D2 in contact with both the trough portion 83 adjacent to the longitudinal direction LD is in 120-150 degrees (preferably 130 to 140 degrees) preferable.

In addition, the dimension 71 _y of the first portion 71 in the front-rear direction LD is 0.15 to 0.30 times (preferably 0.20 to 0.25 times) the dimension MY of the front-rear direction LD of the crotch M preferable. On the other hand, the dimension 72y of the second portion 72 in the front-rear direction LD is 0.10 to 0.25 times (preferably 0.15 to 0.20 times) the dimension M _Y of the crotch M in the front-rear direction LD preferable.

  Here, as described above, the wavelike portion 80 may have a straight wave direction, a curved line, and where the center line of the full amplitude (peak to peak) passes etc. It does not matter. Of course, it is needless to say that the wavy portion 80 includes those which continue at a constant amplitude 82 (± 5 mm) around a specific direction 81 as in the example shown in FIG. The wavelike portion 80 is a combination of a sine curve (eg, the wavelike portion 80 shown in FIG. 9A) or a circular arc (eg, the wavelike portion 80 shown in FIG. 9B). Both regular and irregular shapes, such as those that change in the following direction, those in which the bottom of the wave is pointed (bent) as in the shape of a cloud (for example, the wavelike portion 80 shown in FIG. 9C) Including. From the viewpoint of improving the touch, it is preferable that the shape of the bulging portion 80 is a rounded shape such as a circular arc. The wavy portion 80 in the example shown in FIGS. 7 and 8 is formed by alternately connecting arcs, and in this case, the radius of the arc is preferably about 5 to 15 mm.

  The wave portion 80 of the first portion 71 and the wave portion 80 of the second portion 72 may be continuous or discontinuous. When the wavelike part 80 of the first part 71 and the wavelike part 80 of the second part 72 are broken, a bending part in which the direction changes from the first part 71 to the second part 72, and the wing part WP of the ventral part F Both ends of the lower edge 70 may have a shape in which the corners are firmly left in addition to the shape in which the corners are removed as shown in the illustrated example. In the case of the former, it is preferable that the corner is rounded, and it is particularly preferable that the corner has an arc shape with a radius of about 20 to 80 mm.

  The first and second portions 71 and 72 at the lower edge 70 of the wing portion WP of the ventral portion F, the side edge of the crotch M, and the lower edge 75 of the wing portion WP of the dorsal portion B It is an edge which forms a side edge. With respect to the longitudinal direction LD dimension of each edge, when both of the adjacent edges form a wave-like portion 80, the boundary between one portion and the other portion is located most on the other side of one edge The intersection of a tangent line touching both adjacent valleys 83 and an inner angle bisecting line between the tangent line touching the both adjacent valleys 83 at the other side at the other edge. For example, as shown in FIG. 8, the boundary between the first portion 71 and the second portion 72 is a tangent line D1 in contact with both of the adjacent valleys 83 located at the frontmost position in the first portion 71, and the second portion 72. And the intersection BP with the bisector D4 of the inner angle formed by the tangent D2 in contact with both of the adjacent valleys 83 positioned on the rearmost side.

  In the ventral portion F of the present tape type disposable diaper, the lower edge 70 of the wing portion is based on the proximal first portion 71 which is sufficiently deep toward the waist side and bent laterally therefrom, It has a second portion 72 which extends sufficiently along the groin. Therefore, in the present tape type disposable diaper, even if the wearer bends the thigh greatly, the upper front surface of the thigh is tightly fixed to the lower edge 70 of the wing portion because the first portion 71 is cut up deeply. Hard to hit. Therefore, in the tape-type disposable diaper, when the thigh is bent, the fit between the upper front surface of the thigh and the lower edge 70 of the wing portion of the ventral portion F is good in a wider range of leg circumference dimensions. Become. Furthermore, when the range excluding at least both end portions of the first portion 71 and the range excluding at least both end portions of the second portion 72 are the wavelike portion 80, the overhanging portion 74 that bulges outward in the wavelike portion (see FIG. The position of the lower edge 70 of the wing portion WP can be changed in accordance with the degree of bending deformation of the portion shown by the pattern). Since the overhanging portion 74 is deformed by contact with the body surface, the degree of bending deformation of the overhanging portion 74 is determined by the difference in body size, the degree of bending of the thigh, and the like. That is, the overhanging portion 74 deforms in accordance with the difference in body size, the degree of bending of the thigh, etc., and fits on the body surface. In particular, when the thigh is largely bent, the overhanging portion 74 of the first portion 71 and the second portion 72 is bent to reduce the friction and the contact between the first portion 71 and the second portion 72 and the thigh. Can. In addition, the space under the wing portion WP is not simply expanded, but the overhanging portion 74 covers the widest possible area. For this reason, while it is easy to fit to differences in body size and bending of the thighs, there is little risk of fear of leakage from around the legs. From these viewpoints, it is preferable that the first portion 71 has about 2 to 5 overhang portions 74. In addition, it is preferable that the second portion 72 have approximately 2 to 5 overhang portions 74.

  Although the dimensions of the wavelike portion 80 of the first portion 71 and the wavelike portion 80 of the second portion 72 can be appropriately determined, in the normal case, the maximum value of the total amplitude 82 is 3 to 10 mm, and the wavelength 85 is 10 to 20 mm Is preferred. In particular, if the total amplitude 82 of the wavelike portion 80 is too large, the overhanging portion 74 may be folded between the surface of the diaper and the skin, which may lead to leakage and deterioration of the wearing feeling.

Both side edges 73 of the crotch M may have a wavelike portion 80 similar to the lower edge 75 of the wing portion WP as in the example shown in FIG. 10 except for at least both ends. However, the crotch M is susceptible to the movement of the leg. For this reason, if both side edges 73 of the crotch M are the wavelike portions 80, the overhanging portions 74 may be folded between the surface of the diaper and the skin, which may lead to leakage or deterioration of the wearing feeling. . Therefore, unlike the lower edge 70 of the wing portion WP, both side edges 73 of the crotch M are linearly straight in the direction inclined inward by 1 to 2 degrees toward the front as in the example shown in FIG. It is preferable to extend . As described above, when the width of the crotch M narrows forward, the thigh is likely to move forward. Therefore, when the thigh is bent, the wings of the upper front surface of the thigh and the ventral portion F The fit with the lower edge 70 of the part is better.

  The wing portion WP having the first portion 71 and the second portion 72 as described above can also be formed by other portions and another member. However, in the structure having the side flap portion SF as illustrated, the leg from the side edge of the crotch portion M to the lower edge 70 of the wing portion is cut by cutting the middle in the longitudinal direction LD at the side portion of the side flap portion SF. It is preferable that the peripheral edge is formed because it is easy to manufacture.

  Further, as shown in the illustrated example, a side elastic member 64 is provided on the center side in the width direction WD of the ventral side portion F in the side flap portion SF with respect to the wing portion WP of the ventral side portion F. A flat gather is provided, and the longitudinal range (the range of the longitudinal direction LD of the portion having the side elastic member 64 in the illustrated example) in which the contraction force of the side elastic member 64 acts is the longitudinal range of the first portion 71 It is preferable that the first portion 71 has a portion contracted by the side elastic member 64 in the natural length state, with the overlapping range 77 overlapping at least a part (particularly preferably all) of the above. Thereby, together with the flat gathers, the portion having the first portion 71 can be expanded and contracted to some extent in the front-rear direction LD, so the upper front surface and belly of the thigh when bending the thigh in a wider range of leg dimensions The fit with the lower edge 70 of the wing portion of the side portion F is good. Unlike the illustrated example, the overlapping range 77 of the wavelike portion 80 of the first portion 71 is extended by extending the side elastic member 64 to a position overlapping at least a part (particularly preferably all) of the longitudinal direction LD range of the second portion 72. It may be all over.

  When such overlap range 77 is provided, the maximum elongation of the flat gather is 150 to 350% (more preferably 200 to 300%), and the side elastic member 64 and the first portion 71 in the overlap range 77 In the width direction intervals 64i and 64j, it is preferable that the maximum 64j is 15 to 50 mm (more preferably 18 to 25 mm) and the minimum 64i is 5 to 20 mm (more preferably 10 to 17 mm). If the distance between the first portion 71 and the side elastic member 64 and the maximum elongation of the flat gathers fall within this range, a frill that is gently undulated in the thickness direction is formed on the first portion 71, which is excellent in beauty preferable. In particular, combining such a frill with the shape of the first portion 71 provides an advantage of further improving the frill's aesthetics. On the other hand, if the distance between the first portion 71 and the side elastic member 64 is too short, or the maximum expansion of the flat gather is too large, the frill wave becomes smaller and not only the frilliness decreases, There is a possibility that the touch may become hard. Also, if the distance between the first portion 71 and the side elastic member 64 is too long, the overhanging portion 74 may be folded between the surface of the diaper and the skin, which may lead to leakage or deterioration of the wearing feeling. On the other hand, if the distance between the first portion 71 and the side elastic member 64 is too long or the maximum elongation of the flat gather is too small, the formation of frills may be insufficient. As described above, the maximum elongation means the maximum value of the elongation in the expansion and contraction direction (in other words, the expansion in the unfolded state in which the flat gather is unfolded flat without contraction or slack), and the unfolded state has a natural length It is expressed as a percentage based on 100% of the length.

On the other hand, the bending angle to the rear of the thigh is usually small. It is preferable that the wing portion WP of the back portion B widely cover the buttocks. For this reason, it is preferable that the lower edge 75 of the wing portion WP of the back side portion B is largely bent and laterally extended (longitudinal asymmetry) from the rear end of the crotch portion M unlike the wing portion WP of the ventral side portion F . Further, similarly to the wing portion WP of the ventral portion F, the lower edge 75 of the wing portion WP of the back portion B is such that the range (preferably the entire as in the illustrated example) in the lower edge 75 of the wing portion WP is recessed inward. It is preferable that it is a wavelike portion 80 having a plurality of valleys. Specifically, as shown in FIGS. 7B and 8A, the wavy portion 80 at the lower edge 75 of the wing portion WP of the back portion B is a tangent line D3 in contact with both adjacent valley portions 83. When an obtuse angle side crossing angle theta ₃ is 120 to 150 degrees formed between the longitudinal direction, the dimensions in the longitudinal direction LD of the lower edge 75 of the wing portions WP of the dorsal part B, the dimension in the longitudinal direction LD of the crotch portion M M 0.2 to 0.3 times _Y is preferable.

  Since the lower edge 75 of the wing portion WP of the back portion B is also the wavelike portion 80, it has the same advantage as the lower edge 70 of the wing portion of the ventral portion F. That is, also in the back side portion B, the position of the lower edge 75 of the wing portion can be changed according to the degree of bending deformation of the overhang portion 74 (portion corresponding to the width of the wave). Since the overhanging portion 74 is deformed by contact with the body surface, the degree of bending deformation of the overhanging portion 74 is determined by the difference in body size, the degree of bending of the thigh, and the like. That is, the overhanging portion 74 deforms in accordance with the difference in body size, the degree of bending of the thigh, etc., and fits on the body surface. In particular, when the thigh is largely bent, the overhanging portion 74 is bent, and the friction and the contact between the lower edge 75 and the thigh can be reduced. In addition, the space under the wing portion WP is not simply expanded, but the overhanging portion 74 covers the widest possible area. For this reason, while it is easy to fit to differences in body size and bending of the thighs, there is little risk of fear of leakage from around the legs. From these viewpoints, it is preferable that the lower edge 75 of the wing portion WP of the back portion B has about 2 to 5 overhang portions 74. The size of the wavelike portion 80 at the lower edge 75 of the wing portion WP of the back portion B can be determined as appropriate, but in the normal case the maximum value of the total amplitude 82 is 3 to 10 mm and the wavelength 85 is 10 to 20 mm Is preferred. In particular, if the total amplitude 82 of the wavelike portion 80 is too large, the overhanging portion 74 may be folded between the surface of the diaper and the skin, which may lead to leakage and deterioration of the wearing feeling.

  Further, as in the illustrated example, the longitudinal range (the range in the longitudinal direction LD of the portion having the side elastic member 64 in the illustrated example) of the wing portion WP of the back portion B in which the contraction force of the side elastic member 64 acts is It is preferable to have an overlapping area 77 overlapping at least a part (particularly preferably all) of the lower edge 75 in the front-rear direction. In this case, the maximum elongation of the flat gather and the widthwise intervals 64i and 64j between the lower edge 75 of the wing portion WP of the back portion B and the side elastic member 64 in the overlapping range 77 are Is the same as The advantage of such a structure is basically the same as that of the ventral portion F.

  In the illustrated example, both the ventral portion F and the dorsal portion B have the aforementioned overlapping range 77, but only one of them has the overlapping range 77, and the other does not have the overlapping range 77. Alternatively, although the overlapping range 77 is provided, the conditions such as the aforementioned intervals 64i and 64j may not be satisfied.

  Furthermore, in the case of having the overlapping range 77 described above, the shape of the wavelike portion 80 tends to be noticeable when the entire amplitude gradually or continuously increases as the wavelike portion 80 approaches the crotch M side. Because it is preferable. The lower edge 70, 75 of the wing portion WP extends so as to be positioned diagonally outward toward the front, so the width direction WD distance between the wave portion 80 and the side elastic member 64 in the overlapping range 77 is the crotch M side Becomes shorter, and the frills formed on the wavy portion 80 become finer. Here, if the total amplitude of the wave-like portion 80 is small, the shape of the wave-like portion 80 tends to be inconspicuous.

<Others>
In the above example, the lower edges 70, 75 of the wing portion WP in both the ventral portion F and the dorsal portion B have the wavy portion 80, but only one of them has the wavy portion 80, Can also be of other known shapes.

  In the above example, the lower edge 70 of the wing portion WP of the ventral portion F has the first portion 71 and the second portion 72, but the shape and angle of the lower edge 70 of the wing portion WP of the ventral portion F Is not particularly limited, and may be another known shape. Further, although the second portion 72 in the illustrated example has only one peak portion (between adjacent valley portions 83), it has a plurality of peak portions in combination with the peak portion of the first portion 71. Thus, the wavelike portion 80 may have a plurality of ridges that bulge outward at the entire lower edge 70, 75 of the wing portion WP.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise indicated in the specification.
The “front-rear direction” means the direction (longitudinal direction) indicated by reference numeral LD in the drawing, the “width direction” means the direction (horizontal direction) indicated by WD in the drawing, and the front-rear direction and the width direction Are orthogonal.

  "Curve" means that it does not include a straight line.

  "Expanded state" means a flat state without contraction or slack.

  "Stretch rate" means the value when natural length is 100%. For example, an extension rate of 200% is synonymous with an extension ratio of 2 times.

  "Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion exchanged water: 97.09 wt%) To 49.0 g, add 1.0 g of the superabsorbent polymer and stir with a stirrer. The formed gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours and then returned to normal temperature, and the gel strength is measured with a curd meter (manufactured by I. techno Engineering: Curdmeter-MAX ME-500).

  ・ "Age" is measured as follows. After the sample or test piece is predried, it is left in a test room or apparatus under standard conditions (test place: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to be in a constant weight state. Pre-drying refers to bringing a sample or test piece to a constant weight in an environment at a temperature of 100 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture percentage is 0.0%. From a test piece in a constant weight state, using a template for sampling (100 mm × 100 mm), cut out a sample of 100 mm × 100 mm in size. The weight of the sample is measured, multiplied by 100, the weight per square meter is calculated, and taken as the basis weight.

- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression Tester), load: 0.098 N / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.

  "Water absorption amount" is measured according to JIS K 7223-1996 "Water absorption amount test method for super absorbent resin".

  "Water absorption rate" is the "time to end point" when JIS K 7224-1996 "Water absorption rate test method for super absorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline I assume.

  ・ If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in the test room or equipment under the standard condition (test place: temperature 23 ± 1 ° C, relative humidity 50 ± 2%) Do.

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

  The present invention is applicable to the tape-type disposable diaper as described above.

  11: Liquid impermeable sheet, 12: exterior non-woven fabric, 13: connecting tape, 13A: connecting portion, 13B: tape main portion, 13C: tape mounting portion, 20: target sheet, 30: top sheet, 40: intermediate sheet, DESCRIPTION OF SYMBOLS 50 ... Absorbent element, 56 ... Absorbent body, 58 ... Packaging sheet, 60 ... Rise gather, 62 ... Gather sheet, 64 ... Side elastic member, 70, 75 ... Lower edge, 71 ... 1st part, 72 ... 2nd part, 74: Overlapping part, 77: Overlapping range, 80: Wavy part, 83: Valley part, B: Dorsal part, F: Ventral part, LD: Longitudinal direction, M: Crotch part, SF: Side flap part, WD ... Width direction, WP ... Wing part.

Claims (3)

A ventral 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 crotch portion between the ventilating portion and the back portion ;
It has an absorber incorporated in the range including the crotch part,
The ventral portion and the dorsal portion, the side edges has a wing portion extending out outward in the width direction than the side edge of the crotch portion,
In both sides of the back portion, there are provided connecting tapes for detachably connecting the ventral portion.
In the tape type disposable diaper,
The lower edges of the wing portions of the ventral portion respectively extend so as to be positioned diagonally outward toward the front,
The lower edges of the wing portions of the back portion respectively extend so as to be positioned diagonally outward toward the rear,
The lower edge of the wing portion of at least one of the ventral portion and the dorsal portion has a corrugated portion having a plurality of outwardly bulging peaks,
It has a side flap part which does not have an absorber on both sides in the width direction from the ventral part to the dorsal part,
A side elastic member is provided in the front-rear direction on the widthwise center side of the wing portion in the side flap portion, and a flat gathers shrunk in the front-rear direction is formed by the side elastic member,
There is an overlapping range in which the longitudinal range in which the contraction force of the side elastic member acts and at least a part of the longitudinal range of the wavelike portion overlap.
The maximum elongation of the flat gather is 150 to 350%,
In the overlapping range, the width direction distance between the side elastic member and the corrugated portion, the maximum being 18 to 25 mm, and Ri minimum 10 to 17 mm der,
The wavelike portion has a maximum value of 3 to 10 mm and a wavelength of 10 to 20 mm, respectively.
The side edge of the crotch portion extends linearly in the front-rear direction,
Tape-type disposable diapers characterized by A ventral 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 crotch portion between the ventilating portion and the back portion;
It has an absorber incorporated in the range including the crotch part,
The ventral portion and the dorsal portion have wing portions whose side edges extend outward in the width direction relative to the side edges of the crotch.
In both sides of the back portion, there are provided connecting tapes for detachably connecting the ventral portion.
In the tape type disposable diaper,
The lower edges of the wing portions of the ventral portion respectively extend so as to be positioned diagonally outward toward the front,
The lower edges of the wing portions of the back portion respectively extend so as to be positioned diagonally outward toward the rear,
The lower edge of the wing portion of at least one of the ventral portion and the dorsal portion has a corrugated portion having a plurality of outwardly bulging peaks,
It has a side flap part which does not have an absorber on both sides in the width direction from the ventral part to the dorsal part,
A side elastic member is provided in the front-rear direction on the widthwise center side of the wing portion in the side flap portion, and a flat gathers shrunk in the front-rear direction is formed by the side elastic member,
There is an overlapping range in which the longitudinal range in which the contraction force of the side elastic member acts and at least a part of the longitudinal range of the wavelike portion overlap.
The maximum elongation of the flat gather is 150 to 350%,
The widthwise distance between the side elastic member and the wavelike portion in the overlapping range is 18-25 mm at the maximum and 10-17 mm at the minimum,
The wavelike portion has a maximum value of 3 to 10 mm and a wavelength of 10 to 20 mm, respectively.
The undulating portion has a full amplitude gradually or continuously increasing toward the crotch side,
The side edge of the crotch portion extends linearly in the front-rear direction,
Tape-type disposable diapers characterized by The tape-type disposable diaper according to claim 1 or 2 , wherein both side edges of the crotch portion linearly extend in a direction inclining inward at an angle of 1 to 2 degrees toward the front.

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