JP7295705B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorbent article such as a pad-type absorbent article that is used by being fixed to the inner surface of underwear for the lower body without a crotch such as briefs and shorts (hereinafter also simply referred to as underwear).

Absorbent articles such as disposable diapers and sanitary napkins comprise, as basic elements, an absorbent body, a liquid-permeable top sheet covering the front side of the absorbent body, and a liquid-impermeable resin film covering the back side of the absorbent body. ing. Moreover, in order to make the outer surface of the product feel like cloth, the back side of the liquid-impermeable resin film is often covered with an exterior nonwoven fabric. In this case, the exterior nonwoven fabric and the liquid-impermeable resin film are generally bonded together via a hot-melt adhesive over the entire overlapping region.

On the other hand, for absorbent articles, patterns for decoration (including pictures and one-point characters), function indications such as usage method, usage assistance, size, etc., or mark indications such as manufacturer and product names, characteristic functions, etc. is printed on the liquid-impermeable resin film, and this design is visible from the outer surface of the product through the exterior nonwoven fabric (see, for example, Patent Document 1).

However, in conventional absorbent articles, fine wrinkles may be formed in the outer nonwoven fabric, and the wrinkles stand out against the background of the design or impair the appearance of the design.

Japanese Patent Application Laid-Open No. 2019-63004

Therefore, the main object of the present invention is to suppress deterioration in appearance due to wrinkles in the exterior nonwoven fabric.

As a result of researching the cause of wrinkles in the exterior nonwoven fabric, the present inventors found that when the liquid-impermeable resin film and the exterior nonwoven fabric are adhered while tension is applied during production, the exterior nonwoven fabric after the tension is released. As a result of the shrinkage of the liquid-impermeable resin film to a greater extent than that of the non-woven fabric, many fine wrinkles were generated in the exterior non-woven fabric. The absorbent article described below solves the above problems based on this finding.

<First Aspect>
an absorber;
a liquid-impermeable resin film covering the back side of the absorbent;
and an exterior nonwoven fabric covering the back side of the liquid-impermeable resin film,
The exterior nonwoven fabric is adhered to the liquid-impermeable resin film,
A design is printed on the liquid-impermeable resin film,
The design is visible from the outer surface of the product through the outer nonwoven fabric,
In absorbent articles,
A region that overlaps at least part of the design is a non-bonded region where the exterior nonwoven fabric and the liquid-impermeable resin film are not bonded.
An absorbent article characterized by:

(Effect)
In the present absorbent article, since the area overlapping at least part of the design is a non-bonded area where the outer nonwoven fabric and the liquid-impermeable resin film are not bonded, the Even if the liquid-impermeable resin film shrinks significantly, wrinkles are not formed in the exterior nonwoven fabric, at least in the non-bonded region. Therefore, at least in the non-bonded area, the wrinkles of the outer nonwoven fabric are not conspicuous against the background of the design, and the appearance of the design is not deteriorated.

<Second Aspect>
The liquid-impermeable resin film and the exterior nonwoven fabric extend over the front and rear edges of the absorbent article,
The design is printed on the liquid-impermeable resin film at the front end and the rear end of the absorbent article,
A front end portion and a rear end portion of the absorbent article are bonded regions in which the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
The absorbent article of the first aspect.

(Effect)
In many absorbent articles such as pad-type absorbent articles and tape-type disposable diapers, the liquid-impermeable resin film and outer nonwoven fabric extend over the front and rear edges of the article, and designs are printed on the front and rear edges of the article. often In such an absorbent article, it is preferable to provide a non-bonded area up to the front and rear ends of the article in order to prevent wrinkling of the exterior nonwoven fabric. However, in this case, a gap between the exterior nonwoven fabric and the liquid-impermeable resin film opens at the front and rear ends of the article, which may lead to poor appearance and wearing comfort. Therefore, as in this aspect, even if there is a design, it is preferable that the front and rear ends of the article are not non-bonded areas but bonded areas.

<Third Aspect>
The liquid-impermeable resin film and the exterior nonwoven fabric extend over both side edges of the absorbent article,
The design is printed on the liquid-impermeable resin film on both sides of the absorbent article,
Both sides of the absorbent article are bonded areas where the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
The absorbent article of the first or second aspect.

(Effect)
In many absorbent articles such as pad-type absorbent articles and tape-type disposable diapers, the liquid-impermeable resin film and outer non-woven fabric extend over both side edges of the article, and designs are printed on both sides of the article. often In order to prevent wrinkling of the exterior nonwoven fabric in such an absorbent article, it is preferable to provide non-adhesive regions to both sides of the article. However, in this case, gaps between the outer nonwoven fabric and the liquid-impermeable resin film are formed on both sides of the article, which may lead to deterioration in appearance and wearing comfort. Therefore, as in this aspect, even if there is a design, both sides of the article are preferably not non-adhesive areas but adhesive areas.

<Fourth Aspect>
An elastic member is fixed between the liquid-impermeable resin film and the exterior non-woven fabric or on the front surface of the liquid-impermeable resin film, and the fixed portion of the elastic member is a stretchable region contracted together with the elastic member. and
The design is printed on the liquid-impermeable resin film in the elastic region,
The elastic region is a bonding region in which the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
The absorbent article according to any one of the first to third aspects.

(Effect)
In many absorbent articles such as pad-type absorbent articles and tape-type disposable diapers, an elastic member is fixed between the liquid-impermeable resin film and the exterior nonwoven fabric or on the front surface of the liquid-impermeable resin film. Many of them have a stretchable region, and often a design is printed on the stretchable region. In such an absorbent article, it is preferable to provide a non-bonded area up to the stretchable area in order to prevent the outer nonwoven fabric from wrinkling. However, in this case, the elastic member may not be fixed, or wrinkles formed in the elastic region may become unnecessarily large and irregular. Therefore, as in this aspect, even if the stretchable area has a design, it is preferable that it is an adhesive area instead of a non-adhesive area.

<Fifth Aspect>
A pad-type absorbent article having a crotch portion including the center in the front-rear direction, a front portion extending forward from the center in the front-rear direction, and a rear portion extending rearward from the center in the front-rear direction,
An adhesive layer is provided on the back side of the exterior nonwoven fabric,
The design is printed on the liquid-impermeable resin film in the area having the adhesive layer,
The area having the pressure-sensitive adhesive layer is an adhesive area in which the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
The absorbent article according to any one of the first to fourth aspects.

(Effect)
Pad-type absorbent articles are known to be attached to the inner surface of underwear for the purpose of reducing diaper changing costs and for toilet training. In general, an adhesive layer is provided on the back surface of a pad-type absorbent article that is fixed to underwear, and this adhesive layer is adhered to the inner surface of the diaper or underwear to prevent slippage during wearing. It's like In such a pad-type absorbent article, it is preferable to provide a non-adhesive area up to the area having the pressure-sensitive adhesive layer in order to prevent the outer nonwoven fabric from wrinkling. However, in this case, the outer nonwoven fabric having the adhesive layer may be displaced with respect to the liquid-impermeable resin film to which it is fixed, and the adhesive layer may not sufficiently prevent the pad-type absorbent article from slipping. be. Therefore, as in this aspect, the area having the pressure-sensitive adhesive layer is preferably an adhesive area, not a non-adhesive area, even if there is a design.

<Sixth Aspect>
A test piece is prepared in which the front and rear edges of the outer nonwoven fabric and the liquid-impermeable resin film are aligned, and the outer nonwoven fabric and the liquid-impermeable resin film maintain a bonded state of the product, and the test piece is When the exterior nonwoven fabric and the liquid-impermeable resin film are removed and the dimension in the longitudinal direction of the exterior nonwoven fabric alone and the dimension in the longitudinal direction of the liquid-impermeable resin film alone are measured in the unfolded state,
The ratio of the longitudinal dimension of the liquid-impermeable resin film alone to the longitudinal dimension of the exterior nonwoven fabric alone is 97.5 to 99.0%.
The absorbent article according to any one of the first to fifth aspects.

(Effect)
The liquid-impermeable resin film and the outer nonwoven fabric are not particularly limited, but wrinkles are more likely to occur especially in the outer nonwoven fabric when there is a large difference in shrinkage. Therefore, in the case of the combination of the liquid-impermeable resin film and the covering nonwoven fabric as in this embodiment, the wrinkle-suppressing effect is particularly remarkable when the above-described non-adhesive region is provided (which is of great technical significance).

ADVANTAGE OF THE INVENTION According to this invention, the advantage of being able to suppress the deterioration of the appearance by the wrinkles of an exterior|packing nonwoven fabric is brought about.

Fig. 2 is a plan view showing the front side of the pad-type disposable diaper in an unfolded state; FIG. 2 is a plan view showing the back side of the pad-type disposable diaper in an unfolded state (marks are omitted for clarity of the drawing). FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; FIG. 2 is a cross-sectional view taken along the line BB of FIG. 1; (a) CC sectional view of FIG. 1, (b) DD sectional view of FIG. It is a perspective view showing roughly how to use a pad type disposable diaper. Fig. 2 is a plan view showing the back side of the pad-type disposable diaper in an unfolded state; Fig. 2 is a plan view showing the back side of the pad-type disposable diaper in an unfolded state; Fig. 2 is a plan view showing the back side of the pad-type disposable diaper in an unfolded state; FIG. 2 is a front view schematically showing a state in which a wearer wears underwear with a pad-type disposable diaper. It is a comparison photograph of (a) a wrinkled sample and (b) a wrinkled sample of a pad type disposable diaper.

An example of a pad-type disposable diaper will be described below with reference to the accompanying drawings. 1-5 show a pad-type disposable diaper 200. FIG. The dotted pattern portion in the cross-sectional view shows the adhesive as a joining means for joining each component located on the front side and the back side, and the hot melt adhesive solid, bead, curtain, summit or spiral coating, or pattern coating (transfer of hot-melt adhesive by letterpress method), etc. Alternatively, or together with this, the fixed portion of the elastic member is formed by coating the outer peripheral surface of the elastic member with a comb gun or Surewrap coating. be. 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 joining means for joining each constituent member, a means by material welding such as heat sealing or ultrasonic sealing can be used.

The pad-type disposable diaper 200 includes a crotch portion M including a center 201 in the front-rear direction LD, a front portion F1 extending forward from the center 201 in the front-rear direction LD, and a front portion F1 extending rearward from the center 201 in the front-rear direction LD. It has a rear side portion B1 to do. The dimensions of each part can be determined appropriately. For example, the total length (length in the front-rear direction) L1 of the article can be about 200 to 480 mm, and the total width W1 can be about 120 to 200 mm.

The pad-type disposable diaper 200 includes an absorbent body 23 built in a range including the crotch portion M, a liquid-permeable top sheet 22 covering the front side of the absorbent body 23, and a liquid-impermeable resin covering the back side of the absorbent body 23. a film 21; 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 (such as SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), and any of these nonwoven fabrics can be used.

As the absorber 23, a pile of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric may be used as a basis, and a superabsorbent polymer may be mixed or fixed as necessary. . If desired, the absorbent body 23 can be wrapped with crepe paper or non-woven fabric (not shown). The shape of the absorber 23 can be any suitable shape such as a rectangular shape. It has a shape (substantially hourglass shape). The basis weight of fibers and the basis weight of the absorbent polymer in the absorbent body 23 can be appropriately determined, but the basis weight of the fibers is preferably about 100 to 600 g/m ² , and the basis weight of the absorbent polymer is about 0 to 400 g/m ² . preferably.

A liquid-impermeable resin film 21 is provided on the back side of the absorbent body 23 . As the liquid-impermeable resin film 21, in addition to a polyethylene film or the like, a moisture-permeable sheet can be used without impairing water impermeability from the viewpoint of preventing stuffiness. The water-impervious/moisture-permeable sheet is a microporous sheet obtained by, for example, forming a sheet by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching the sheet in a uniaxial or biaxial direction. can be used. In the illustrated example, the liquid-impermeable resin film 21 protrudes around the absorber 23 , but may not protrude around the absorber 23 .

The outer surface (back surface) of the liquid-impermeable resin film 21 is covered with an exterior nonwoven fabric 25 . Various nonwoven fabrics can be used as the exterior nonwoven fabric 25 .

The front side of the absorbent body 23 is covered with the top sheet 22 . Although the absorber 23 partially protrudes from the side edges of the top sheet 22 in the illustrated example, the width of the top sheet 22 can be widened so that the side edges of the absorber 23 do not protrude. As the top sheet 22, a perforated or non-perforated nonwoven fabric, a perforated plastic sheet, or the like is used.

The front and rear end portions of the pad-type disposable diaper 200 are end flap portions EF in which the absorbent body 23 does not exist and which extend in both front and rear directions from the front and rear ends of the absorbent body 23 . The material constituting the end flap part EF is not particularly limited, but in the illustrated example, the parts of the liquid-impermeable resin film 21, the exterior nonwoven fabric 25 and the top sheet 22 extending to both front and rear sides of the absorbent body 23 are used. It has become.

Both sides of the pad-type disposable diaper 200 are formed as side flaps SF extending laterally of the absorber. Although the material constituting the side flap portion SF is not particularly limited, in the illustrated example, the width direction of the absorbent body 23 in the liquid-impermeable resin film 21, the exterior nonwoven fabric 25, the top sheet 22, and the gathered sheet 62 It is a portion that extends to both sides of the WD. Materials including these can be bonded together by material welding such as heat sealing, ultrasonic sealing, etc., in addition to hot-melt adhesives indicated by dotted patterns in the drawing.

(Getting up gathers)
In order to block urine and loose stools moving laterally on the top sheet 22 and prevent side leakage, on both sides of the surface of the disposable diaper in the width direction WD, protrusions (protrusions) are provided from the sides of the top sheet 22 toward the skin. ) The rising gathers 60 are provided over the entire front-rear direction.

The rising gathers 60 of the illustrated example have a root portion 65 fixed to an area including the side flap portion SF, a protruding portion 66 extending from the root portion 65, and both front and rear ends of the protruding portion fixed in a fallen state. an unfixed raised portion 68 positioned between the front and rear lowered portions of the protruding portion 66; and gather elastics fixed to at least the tip of the raised portion 68 while being stretched in the front-rear direction. and a member 63 . The rising gathers 60 are formed by a gathered sheet 62 folded back at the tip, and a plurality of gathered elastic members 63 may be provided at intervals as in the illustrated example, or one each may be provided. Although the elongation rate of the portion having the gather elastic member 63 is not particularly limited, it is usually preferably 150 to 350%, more preferably 200 to 300%.

The base portion 65 of the rising gathers 60 in the illustrated example is provided only in the side flap portion SF, and is joined to the side portion of the liquid-impermeable resin film 21 and the side portion of the exterior nonwoven fabric 25, but the side flap portion It may extend from the SF to the side of the region overlapping the absorber 23 .

The protruding portion 66 of the rising gathers 60 has fallen portions at both ends in the front-rear direction LD, but the portion between them is a non-fixed rising portion 68, and the rising portion 68 contracts the gather elastic member 63. You will stand up by force. When the diaper is put on, the diaper is put on the body in a boat shape and the contractive force of the gather elastic member 63 acts, so that the contractive force of the gather elastic member 63 raises the rise gather 60 and elastically sticks it around the leg. As a result, so-called side leakage from around the leg is prevented.

As the material of the gather sheet 62, a plastic sheet or a melt-blown nonwoven fabric can be used, but from the point of feeling on the skin, it is preferable to use a nonwoven fabric treated with silicone or the like for water repellency. The gather elastic member 63 is made of thread-like, cord-like, belt-like, or the like styrene-based rubber, olefin-based rubber, urethane-based rubber, ester-based rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene, silicone, polyester, or the like. The material used can be used.

(side gather)
Each side flap portion SF has an elongated side elastic member 64 extending in the front-rear direction LD in a range in the front-rear direction LD including the crotch portion M. It has elastic regions A1 (side gathers) that are contracted in the front-rear direction LD by the contraction of 64 and that are expandable in the front-rear direction LD. As shown in the figure, the side elastic member 64 is provided between the gather sheet 62 and the liquid-impermeable resin film 21 outside the width direction WD in the vicinity of the joining start end of the joining portion of the gather sheet 62. It can also be provided between the liquid-impermeable resin film 21 and the exterior nonwoven fabric 25 in the flap portion SF. Only one side elastic member 64 is provided on each side as in the illustrated example, or a plurality of side elastic members 64 may be provided on each side. As the side elastic member 64, the same material as the gather elastic member 63 can be used.

The side elastic members 64 may exist only in the elastic area A1, or may exist on the front side, the rear side, or both sides of the elastic area A1. In the latter case, the side elastic members 64 may be finely cut at one or a number of locations other than the stretchable region A1, may not be fixed to the sheets sandwiching the side elastic members 64, or both. , the non-stretchable region A2 (substantially equivalent to not providing an elastic member). The range of the stretchable region A1 in the front-rear direction LD can be determined as appropriate, but preferably includes at least the crotch portion M. It is preferable to extend on both sides in the front-rear direction LD.

(Adhesive layer)
As shown in FIGS. 2, 3 and 5, an adhesive layer 30 is provided on the back surface of the pad-type disposable diaper 200, that is, on the back surface of the exterior nonwoven fabric 25 in the illustrated example. The adhesive layer 30 is desirably covered with a release sheet 31 so as to be releasable, and the release sheet 31 is peeled off at the time of use to expose the adhesive layer 30, as shown in the illustrated example.

In the illustrated example, the pressure-sensitive adhesive layer 30 is provided continuously along the front-rear direction. It may be provided only in the middle part of the direction. When a plurality of pressure-sensitive adhesive layers 30 are provided, it is preferable to provide at least one for each of the front side portion F1 and the rear side portion B1.

The pressure-sensitive adhesive layer 30 is preferably dimensioned and arranged so that the entirety of the pressure-sensitive adhesive layer 30 can be accommodated within the region overlapping the absorbent body 23 . Specifically, the width W3 of the adhesive layer 30 is about 60 to 80% of the width W2 of the absorbent body 23, and the length L3 in the front-rear direction (the total length when multiple layers are provided in the front-back direction) is the total length L2 of the absorbent body 23. It is preferably about 60 to 110%, or about 60 to 100% of the total length L1 of the article. The adhesive layer 30 may extend from the region overlapping the absorbent body 23 to the end flap portion EF.

(design)
Designs 40 to 43 (in the illustrated example, a horizontal reference line 43 between marks 40 and 41 and a vertical reference line 42 to be described later) are printed on the liquid-impermeable resin film 21 . The designs 40 to 43 are provided to be visible as the designs 40 to 43 from the outer surface of the product, that is, the background colors of the liquid-impermeable resin film 21 and the exterior nonwoven fabric 25 (usually white, light blue, or light green). The shape and the like are not particularly limited as long as they are provided in different colors. The designs 40 to 43 are, for example, patterns for decoration (including pictures and one-point characters in addition to polka-dot patterns and floral patterns), usage methods and marks 40 (use aids), function indications such as sizes, manufacturers and It can be a product name, a mark such as a distinctive function, etc., or a combination of these. The designs 40 to 43 may be printed on the back surface of the liquid-impermeable resin film 21, but are printed on the front surface of the liquid-impermeable resin film 21 as long as they are visible from the outer surface of the product. may

In the illustrated example, a mark 40 for confirming the mounting position is printed as a design on the liquid-impermeable resin film 21 . More specifically, in the example shown in FIG. 7, marks 40 for confirming attachment positions are visible from the back side (outside) of the pad-type disposable diaper 200 on both sides of the undergarment 100 at the lowermost portion 101. It is set up like this. This pad-type disposable diaper 200 can be attached to the underwear 100 as shown in FIG. A mark 40 can be used for this attachment. Furthermore, as shown in FIG. 10 , after attachment to the underwear 100 and before the wearer puts on the underwear 100 , marks 40 on both sides of the pad-type disposable diaper 200 exposed from the leg openings LO of the underwear 100 are marked on the underwear 100 . By visually recognizing from the outside and confirming whether or not the position is the lowest part 101 of the undergarment 100, it is possible to easily confirm whether the mounting position is appropriate in a state where the undergarment 100 is mounted.

The "part to be located at the lowest part 101 of the underwear 100" can be appropriately determined depending on the product, but if the shape and structure are symmetrical in the front-rear direction as in the illustrated example, the center in the front-rear direction LD can be. Further, when the absorber 23 has a constricted portion 23n, the center in the front-rear direction of the constricted portion 23n can be defined as "the portion to be positioned at the lowest portion 101 of the underwear 100".

The mark 40 can be appropriately selected from circles (example shown in FIG. 8), triangles, squares, stars (example shown in FIG. 7), arrow shapes, characters, and the like, which can indicate positions. The mark 40 may be provided by printing, may be provided by shape processing such as embossing, or may be provided by combining the two. Since the embossed mark 40 has unevenness, there is an advantage that the position of the mark 40 can be grasped by touching it with a hand when the mark 40 is difficult to see.

As long as the mark 40 is visible from the back side of the pad-type disposable diaper 200, the mark 40 may be provided on any existing member, or a dedicated member may be added. For example, the mark 40 may be printed on the back surface of the liquid-impermeable resin film 21 so that the mark 40 can be seen through the exterior nonwoven fabric 25 and visually recognized. In addition, a printed sheet made of paper or the like on which a mark 40 is printed is interposed between the liquid-impermeable resin film 21 and the outer nonwoven fabric 25 so that the mark 40 on the printed sheet can be seen through the outer nonwoven fabric 25. good too. Furthermore, the mark 40 may be directly printed on the back surface of the exterior nonwoven fabric 25 .

The dimensions of the mark 40 can be determined as appropriate, but considering that it is intended to indicate a localized area and that it is easy to see in normal use, the dimension (total length) in the front-rear direction LD should be 8 to 20 mm. is preferable, and the dimension (entire width) in the width direction WD is preferably 8 to 20 mm.

The closer the position of the mark 40 is to the side edge, the better. For this reason, in the pad-type disposable diaper 200 having the side flap portions SF as in the illustrated example, it is preferable to provide the side flap portions SF. As a specific dimension, it is preferable that the distance 40d between the side edge of the pad-type disposable diaper 200 and the mark 40 in the width direction WD is 35 mm or less. However, when the side flap portion SF has the stretchable region A1 by the side elastic member 64, the mark 40 is located laterally from the side edge of the constricted portion 23n and from the side elastic member 64 in the center in the width direction WD. preferably on the side. The pad-type disposable diaper 200 having the constricted portions 23n and the side flap portions SF as described above has the side elastic members 64 provided in the side flap portions SF, so that it has a boat shape when attached to the underwear, and particularly around the wearer's legs. It has a high fit for In the case of such a pad-type disposable diaper 200, the side flap portions SF of the crotch portion M are exposed from the leg openings LO of the undergarment 100 when attached to the undergarment. However, if the portion having the mark 40 is shrunk by the side elastic member 64, the mark 40 may be hidden in wrinkles or the shape of the mark 40 may be lost, making it difficult to see the mark 40. On the other hand, as in the examples shown in FIGS. 7 and 8, the mark 40 is provided laterally from the side edge of the constricted portion 23n and closer to the center side in the width direction WD than the side elastic member 64. This prevents the mark 40 from being positioned at the portion where the wrinkles are formed the deepest (that is, does not overlap the side elastic member 64), thereby suppressing deterioration of the visibility of the mark 40. As a specific dimension, it is preferable that the distance 64d between the side edge of the pad-type disposable diaper 200 and the side elastic member 64 in the width direction WD is 15 mm or less.

As shown in FIG. 9, the stretchable regions A1 by the side elastic members 64 are provided on both front and rear sides of the mark 40, and the range in the front-rear direction LD having the mark 40 is preferably the non-stretchable region A2. . Thus, when the range of the mark 40 in the front-rear direction LD is the non-stretchable region A2, the mark 40 is less likely to be hidden in wrinkles and the shape of the mark 40 is less likely to be lost, thereby improving the visibility of the mark 40. becomes good.

On the other hand, as shown in FIG. 8, marks 41 for checking misalignment are provided so as to be visually recognizable from the back side at positions spaced apart from the mark 40 on both sides of the crotch portion M on both sides. is preferred. In this way, if the marks 41 for confirming deviation are provided at respective positions spaced apart from the mark 40 for confirming the mounting position, as shown in FIG. This is preferable because it makes it easy to see if there is any difference (however, FIG. 10 shows a state in which there is no deviation). For example, when viewed from the front of the undergarment 100 while attached to the undergarment 100, only the marks 41 for checking the misalignment can be seen on both sides of the pad-type disposable diaper 200 exposed from the leg openings LO of the undergarment 100. It becomes obvious that the . The mark 41 for confirming deviation can be formed in the same shape and size as the mark 40 for confirming the mounting position described above, on the same member, and by the same means.

Further, as shown in FIGS. 7 to 9, vertical reference lines 42 extending linearly in the front-rear direction LD adjacent to the inner side of each mark 40 for confirming the mounting position in the width direction WD, and these vertical reference lines 42 A horizontal reference line 43 linearly extending in the width direction WD is provided so as to be visible from the back side of the pad-type disposable diaper 200 along the portion to be positioned at the lowest part 101 of the underwear 100 between the It is also preferable to have By providing the vertical reference line 42 and the horizontal reference line 43, it becomes easy to grasp the orientation of the pad-type disposable diaper 200 when attaching it to the underwear 100. FIG. Also, the vertical reference line 42 is adjacent to the mark 40 . Therefore, when attached to the underwear 100, the vertical reference line 42 is also exposed from the leg openings LO of the underwear 100. By visually recognizing the vertical reference line 42, the direction of the pad-type disposable diaper 200 attached to the underwear 100 can be determined. You can easily check if it is suitable. The vertical reference line 42 and the horizontal reference line 43 can be formed on the same member as the above-described mark 40 for confirming the mounting position by the same means.

In particular, the vertical reference line 42 has a width 42w of about 7 to 30 mm, and the side edge of the adhesive layer 30 has a widthwise separation distance 42d from the edge of the vertical reference line 42 on the center side in the width direction WD. It is preferable that it extends linearly along the front-rear direction LD through a position of 10 mm or less. Since the vertical reference line 42 and the side edge of the adhesive layer 30 are in such a positional relationship, the pad type disposable diaper 200 can be easily adjusted while adjusting the direction of the pad type disposable diaper 200 with the vertical reference line 42 as a reference. can be attached to the undergarment 100.

(non-bonded area, bonded area)
As shown in FIGS. 3, 4 and 7, the area overlapping at least part of the designs 40 to 43 is the non-bonded area 10 ( area with diagonal lines). Therefore, even if the liquid-impermeable resin film 21 shrinks more than the outer nonwoven fabric 25 during manufacturing, the outer nonwoven fabric 25 does not wrinkle at least in the non-adhesive region 10 . Therefore, at least in the non-bonded area 10, the wrinkles of the exterior nonwoven fabric 25 do not stand out against the background of the designs 40-43, and the appearance of the designs 40-43 does not deteriorate.

FIG. 11(a) is a photograph of a sample in which the area overlapping the design (vertical reference line 42) is the adhesion area 11, and FIG. 11(b) is a photograph of the design (vertical It is a photograph of a sample having a non-bonded area 10 in the area overlapping with a reference line 42). As can be seen from FIG. 11( a ), when the area overlapping the design (vertical reference line 42 ) is the adhesion area of the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 , fine wrinkles 15 are formed in the exterior nonwoven fabric 25 . are formed, wrinkles 15 are conspicuous in the area overlapping with the design (vertical reference line 42), and the appearance deteriorates. On the other hand, as shown in FIG. 11(b), if the non-adhesive area 10 is provided in the area overlapping the design (vertical reference line 42), wrinkles are not formed and deterioration of the appearance is suppressed.

If only the prevention of the wrinkles 15 of the outer nonwoven fabric 25 is considered, as in the example shown in FIG. It is preferred to have 10. However, as described below, even if there are designs 40 to 43 depending on the part, it is also preferable that the non-bonded area 10 is not the bonded area 11 but the bonded area 11 is formed.

For example, in the illustrated pad-type disposable diaper 200, the liquid-impermeable resin film 21 and the exterior non-woven fabric 25 extend over the front and rear edges of the article, and designs 40 to 43 are printed on the front and rear ends of the pad-type disposable diaper 200. It is In this case, if the non-adhesive region 10 is provided to the front and rear ends of the pad-type disposable diaper 200, a gap between the outer nonwoven fabric 25 and the liquid-impermeable resin film 21 opens at the front and rear ends of the pad-type disposable diaper 200, resulting in poor appearance. It may lead to deterioration of wearing comfort. Therefore, as shown in FIG. 8, even if the designs 40 to 43 are printed on the liquid-impermeable resin film 21 at the front and rear ends of the pad-type disposable diaper 200, this portion is not the non-adhesive region 10. Instead, it is preferable that the bonding area 11 is formed by bonding the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 together. In this case, within a range of 20 mm from the front end and the rear end of the pad-type disposable diaper 200 to the central side in the front-rear direction LD, it is preferable that the portion not having the designs 40 to 43 printed occupies 80% or more of the area. . The dimension of the bonding region 11 in the front-rear direction LD can be determined as appropriate, and can be normally about 2 to 40 mm. Further, as in the example shown in FIG. 7, when the non-adhesive region 10 is provided to the front and rear ends of the pad-type disposable diaper 200, if the width is narrow, for example, about 2 to 30 mm, the gap between the non-adhesive regions 10 can be reduced. The opening is inconspicuous, and it is possible to suppress the deterioration of the appearance and wearing comfort.

The same is true when the liquid-impermeable resin film 21 and the outer nonwoven fabric 25 extend over both side edges of the article and the designs 40 to 43 are printed on both sides of the pad-type absorbent article. Therefore, even if the designs 40 to 43 are printed on the liquid-impermeable resin film 21 on both sides of the pad-type disposable diaper 200 as shown in FIGS. It is preferable that the bonding area 11 is formed by bonding the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 together. In this case, within a range of 20 mm from the side edges of the pad-type disposable diaper 200 to the center in the width direction WD, it is preferable that the area not having the designs 40 to 43 printed occupies 90% or more of the area. The dimension of the bonding area 11 in the width direction WD can be determined as appropriate, and can be normally about 2 to 40 mm.

Further, like the pad-type disposable diaper 200 of the illustrated example, an elastic member (side elastic member 64) is fixed to the front side surface of the liquid-impermeable resin film 21 to form a stretchable region A1, and the stretchable region A1 is formed. When the designs 40 to 43 are printed in the area A1, if the non-adhesive area 10 is provided up to the stretchable area A1, the wrinkles 15 formed in the stretchable area A1 become unnecessarily large and irregular. Further, although not shown, when an elastic member is provided between the liquid-impermeable resin film 21 and the exterior nonwoven fabric 25, if the non-adhesive region 10 is provided up to the elastic region A1, the elastic member cannot be fixed at that portion. Therefore, as shown in FIGS. 7 to 9, even if the designs 40 to 43 are printed on the liquid-impermeable resin film 21 in the stretchable region A1 of the side elastic member 64 or the like, the stretchable region A1 is covered with the exterior nonwoven fabric. 25 and the liquid-impermeable resin film 21 are preferably adhered to form the adhesion region 11 . In this case, it is preferable that the stretchable area A1 has 90% or more of the area where the designs 40 to 43 are not printed.

Further, like the pad-type disposable diaper 200 in the illustrated example, an adhesive layer 30 is provided on the back surface of the exterior nonwoven fabric 25 for the purpose of preventing slippage, and the area having the adhesive layer 30 has a design 40 . 43 are printed, if the non-adhesive region 10 is provided up to the region having the adhesive layer 30, the exterior nonwoven fabric 25 having the adhesive layer 30 is fixed to the liquid-impermeable resin film 21. There is a risk that the adhesive layer 30 will not sufficiently prevent the pad-type absorbent article from slipping. Therefore, as shown in FIGS. 7 and 8, even if the designs 40 to 43 are printed on the liquid-impermeable resin film 21 in the area having the adhesive layer 30, the area having the adhesive layer 30 , the bonding region 11 is preferably formed by bonding the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 together. In this case, it is preferable that 90% or more of the area having the adhesive layer 30 is not printed with the designs 40 to 43 .

The liquid-impermeable resin film 21 and the exterior nonwoven fabric 25 are not particularly limited, but the exterior nonwoven fabric 25 is particularly prone to wrinkles 15 when the difference in shrinkage ratio is large. Therefore, in a normal case, the front and rear edges of the outer nonwoven fabric 25 and the liquid-impermeable resin film 21 are aligned with each other, and the outer nonwoven fabric 25 and the liquid-impermeable resin film 21 maintain the bonded state of the product. Prepared, the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 of this specimen are removed, and in the unfolded state, the dimension in the front-back direction of the exterior non-woven fabric 25 alone and the dimension in the front-back direction of the liquid-impermeable resin film 21 alone When measuring the dimensions, when the ratio of the longitudinal dimension of the liquid-impermeable resin film 21 alone to the longitudinal dimension of the exterior nonwoven fabric 25 alone is 97.5 to 99.0%, the above-mentioned When the non-bonded area 10 is provided, the effect of suppressing wrinkles 15 is particularly noticeable (that is, after releasing the tension during manufacturing, when the liquid-impermeable resin film 21 shrinks to some extent more than the exterior nonwoven fabric 25, technical significance). When the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 are aligned at the front and rear edges of the product as in the case of the pad-type disposable diaper shown in the figure, the product itself can be used as the specimen. In a product in which the front and rear edges of the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 do not match, the exterior nonwoven fabric 25 and the liquid-impermeable resin film 21 maintain the adhesive state of the product. By cutting out a test piece in which the front and rear edges of the transparent resin film 21 are aligned, the above dimensions can be measured.

<Description of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

・"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. are orthogonal.

- 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.

- "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.

- "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 deionized water: 97.09 wt% 1.0 g of superabsorbent polymer is added to 49.0 g of the mixture) and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat 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 measurement program) under the conditions of a load of 0.098 N/cm ² and a pressurized area of 2 cm ² .

- "Unfolded state" means a flat unfolded state without contraction or slack.

・Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

・If there is no description about environmental conditions for testing and measurement, the test and measurement shall be performed in a laboratory or equipment under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%). do.

INDUSTRIAL APPLICABILITY The present invention is applicable to pad-type absorbent articles fixed to the inner surface of underwear, such as pad-type disposable diapers and sanitary napkins having an adhesive layer on the back surface.

A1... stretchable region, A2... non-stretchable region, B1... rear part, F1... front part, LD... front-back direction, LO... leg opening, M... crotch part, SF... side flap part, WD... width direction, 10... Non-adhesive region 11 Adhesive region 15 Wrinkles 21 Liquid-impermeable resin film 22 Top sheet 23 Absorber 23n Constricted portion 25 Exterior nonwoven fabric 30 Adhesive layer 31 Release sheet 40 to 43 Design 40 Mark 41 Mark for checking misalignment 42 Vertical reference line 43 Horizontal reference line 60 Raising gather 64 Side elastic member 100 Undergarment 101 Bottom, 200...Pad type disposable diaper.

Claims (6)

an absorber;
a liquid-impermeable resin film covering the back side of the absorbent;
and an exterior nonwoven fabric covering the back side of the liquid-impermeable resin film,
The exterior nonwoven fabric is adhered to the liquid-impermeable resin film,
A design is printed on the liquid-impermeable resin film,
The design is visible from the outer surface of the product through the outer nonwoven fabric,
In absorbent articles,
The same range as the entire region overlapping the design, or a wider range including the entire region overlapping the design is a non-bonded region where the exterior nonwoven fabric and the liquid-impermeable resin film are not bonded.
An absorbent article characterized by: an absorber;
a liquid-impermeable resin film covering the back side of the absorbent;
and an exterior nonwoven fabric covering the back side of the liquid-impermeable resin film,
The exterior nonwoven fabric is adhered to the liquid-impermeable resin film,
A design is printed on the liquid-impermeable resin film,
The design is visible from the outer surface of the product through the outer nonwoven fabric,
In absorbent articles,
A region overlapping at least part of the design is a non-bonded region where the exterior nonwoven fabric and the liquid-impermeable resin film are not bonded,
The liquid-impermeable resin film and the exterior nonwoven fabric extend over the front and rear edges of the absorbent article,
The design is printed on the liquid-impermeable resin film at the front end and the rear end of the absorbent article,
A front end portion and a rear end portion of the absorbent article are bonded regions in which the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
An absorbent article characterized by : The liquid-impermeable resin film and the exterior nonwoven fabric extend over both side edges of the absorbent article,
The design is printed on the liquid-impermeable resin film on both sides of the absorbent article,
Both sides of the absorbent article are bonded areas where the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
3. The absorbent article according to claim 1 or 2. an absorber;
a liquid-impermeable resin film covering the back side of the absorbent;
and an exterior nonwoven fabric covering the back side of the liquid-impermeable resin film,
The exterior nonwoven fabric is adhered to the liquid-impermeable resin film,
A design is printed on the liquid-impermeable resin film,
The design is visible from the outer surface of the product through the outer nonwoven fabric,
In absorbent articles,
A region overlapping at least part of the design is a non-bonded region where the exterior nonwoven fabric and the liquid-impermeable resin film are not bonded,
An elastic member is fixed between the liquid-impermeable resin film and the exterior non-woven fabric or on the front surface of the liquid-impermeable resin film, and the fixed portion of the elastic member is a stretchable region contracted together with the elastic member. and
The design is printed on the liquid-impermeable resin film in the elastic region,
The elastic region is a bonding region in which the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
An absorbent article characterized by : an absorber;
a liquid-impermeable resin film covering the back side of the absorbent;
and an exterior nonwoven fabric covering the back side of the liquid-impermeable resin film,
The exterior nonwoven fabric is adhered to the liquid-impermeable resin film,
A design is printed on the liquid-impermeable resin film,
The design is visible from the outer surface of the product through the outer nonwoven fabric,
In absorbent articles,
A region overlapping at least part of the design is a non-bonded region where the exterior nonwoven fabric and the liquid-impermeable resin film are not bonded,
A pad-type absorbent article having a crotch portion including the center in the front-rear direction, a front portion extending forward from the center in the front-rear direction, and a rear portion extending rearward from the center in the front-rear direction,
An adhesive layer is provided on the back side of the exterior nonwoven fabric,
The design is printed on the liquid-impermeable resin film in the area having the adhesive layer,
The area having the pressure-sensitive adhesive layer is an adhesive area in which the exterior nonwoven fabric and the liquid-impermeable resin film are bonded together.
An absorbent article characterized by : an absorber;
a liquid-impermeable resin film covering the back side of the absorbent;
and an exterior nonwoven fabric covering the back side of the liquid-impermeable resin film,
The exterior nonwoven fabric is adhered to the liquid-impermeable resin film,
A design is printed on the liquid-impermeable resin film,
The design is visible from the outer surface of the product through the outer nonwoven fabric,
In absorbent articles,
A region overlapping at least part of the design is a non-bonded region where the exterior nonwoven fabric and the liquid-impermeable resin film are not bonded,
A test piece is prepared in which the front and rear edges of the outer nonwoven fabric and the liquid-impermeable resin film are aligned, and the outer nonwoven fabric and the liquid-impermeable resin film maintain a bonded state of the product, and the test piece is When the exterior nonwoven fabric and the liquid-impermeable resin film are removed and the dimension in the longitudinal direction of the exterior nonwoven fabric alone and the dimension in the longitudinal direction of the liquid-impermeable resin film alone are measured in the unfolded state,
The ratio of the longitudinal dimension of the liquid-impermeable resin film alone to the longitudinal dimension of the exterior nonwoven fabric alone is 97.5 to 99.0%.
An absorbent article characterized by :

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