Pad-type disposable diapers

Abstract

When attached to underwear, it is possible to easily confirm whether the attachment position is appropriate. The above-mentioned problem is solved by the following method: a pad-type disposable diaper (200) is provided with an adhesive layer (30) on the back of a first fixing area (A1) located in a crotch portion (M) and a second fixing area (A2) located on the front and rear sides of the first fixing area (A1), and at least one of the front and rear ends is fixed to the underwear (100) in a state of extending from the edge (110) of the waist opening of the underwear (100), wherein a pair of left and right marks (41, 42) indicating the position in the front-to-back direction (LD) are provided at at least one of the front and rear ends in a manner that can be visually viewed from the back side of the product, and the pair of marks (41, 42) are separated from each other in the width direction (WD) and are line-symmetrical about a center line (102) passing through the center of the product in the width direction (WD).

Description

Technical Field

[0001] The present invention relates to a pad-type disposable diaper which is used by being fixed to the inner surface of underwear for the lower body (hereinafter also simply referred to as underwear) such as underpants and shorts. Background Art

[0002] As one of such pad-type disposable diapers, there is a pad-type disposable diaper that is attached to the inner surface of underwear and used for the purpose of reducing diaper replacement costs and toilet training (see, for example, Patent Documents 1 and 2).

[0003] Generally, a pad-type disposable diaper to be fixed to underwear is provided with a fixing region having an adhesive layer on the back surface, and the back surface of the fixing region is adhered to the inner surface of the diaper or underwear to prevent displacement during wearing.

[0004] Such a pad-type disposable diaper is generally put on as follows: first, the crotch portion (usually the center in the front-to-back direction) of the diaper is aligned with the crotch portion of the underwear, and after the first fixing area located in the crotch portion of the diaper is fixed to the inner surface of the underwear using the adhesive layer on its back, the second fixing area located in the front and back sides of the first fixing area is pressed against the inner surface of the underwear, and the second fixing area is fixed to the inner surface of the underwear using the adhesive layer on its back. In addition, such a wearing operation is generally to install the pad-type disposable diaper inside the underwear before putting on the underwear.

[0005] However, in the conventional pad-type disposable diaper, when worn in such a general procedure, there is a problem that the second fixing area is fixed to the underwear in a state of being tilted relative to the center line passing through the center in the width direction of the underwear, and the tilt is difficult to notice. When used in such a tilted wearing state, there is a possibility of poor wearing comfort and leakage, and therefore a solution is desired.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2003-93438

[0009] Patent Document 2: Japanese Patent Application Publication No. 2020-049018 Summary of the invention

[0010] Problems to be solved by the invention

[0011] Therefore, a main object of the present invention is to provide a pad-type disposable diaper that can be easily fixed in an appropriate position with respect to underwear.

[0012] Means for solving problems

[0013] The pad-type disposable diaper that has solved the above-mentioned problems is as follows.

[0014] <Method 1>

[0015] A pad-type disposable diaper, characterized in that the pad-type disposable diaper comprises: a crotch portion including a center in a front-to-back direction; a front side portion extending forward than the crotch portion; and a rear side portion extending rearward than the crotch portion, the pad-type disposable diaper having an absorbent body extending over the front side portion, the crotch portion and the rear side portion, the pad-type disposable diaper having: a first fixing area located in the crotch portion; and a second fixing area located at a position closer to the front and rear sides than the first fixing area, an adhesive layer is provided on the back side of the first fixing area and the second fixing area, at least one of the front and rear ends is fixed to the underwear in a state of extending from the edge of the waist opening of the underwear, and a pair of left and right marks indicating the position in the front-to-back direction are provided on at least one of the front and rear ends in a manner that can be visually seen from the back side of the product, the pair of marks are separated from each other in the width direction, and are line-symmetrical about a center line passing through the center of the width direction of the product.

[0016] (Effect)

[0017] When the pad-type disposable diaper is mounted on underwear, the crotch portion of the diaper (usually the center in the front-to-back direction) is aligned with the crotch portion of the underwear. After the first fixing area of ​​the diaper located in the crotch portion is fixed to the inner surface of the underwear using the adhesive layer on its back, the position of the second fixing area can be confirmed using the mark set at at least one of the front and back ends of the diaper. Specifically, the second fixing area is aligned with the inner surface of the underwear so that at least one of the front and back ends of the diaper protrudes from the edge of the waist opening of the underwear. Then, the position of the second fixing area is adjusted by visually observing the protruding portion with the underwear as a reference so that the appearance of the pair of marks is symmetrical. When the adhesive layer of the second fixing area is already bonded during the position adjustment, it is peeled off and re-bonded after adjusting the position. The position adjustment can be repeated as needed. In this way, by using the mark set at the end of the diaper, the second fixing area can be more easily fixed to the appropriate position on the underwear.

[0018] <Method 2>

[0019] The pad-type disposable diaper according to the first aspect, wherein each of the pair of marks is a scale arranged at regular intervals in the front-rear direction.

[0020] (Effect)

[0021] In this way, when a pair of marks are scales arranged at regular intervals in the front-to-back direction, by using the scales on the left and right sides to confirm the position of the edge of the waist opening of the underwear, it is easier to visually check whether the appearance of the pair of marks is symmetrical on the left and right with respect to the underwear, so it is preferred.

[0022] <Third Method>

[0023] The pad-type disposable diaper according to the first aspect or the second aspect, wherein

[0024] The pad-type disposable diaper comprises: an area having the absorbent body; and side wings extending laterally relative to both side edges of the area having the absorbent body, the side wings not having the absorbent body, and the pair of marks are respectively arranged at positions corresponding to both end portions in the width direction of the area having the absorbent body.

[0025] (Effect)

[0026] The distance between the pair of marks in the width direction is preferably large. However, in the case of a pad-type disposable diaper having side flaps, the side flaps are easily deformed, so when a pair of marks are provided on the side flaps, the portion where the marks are arranged may bend, making it difficult to accurately visually check the symmetry of the left and right marks. In contrast, the region with the absorbent body is a portion that is relatively rigid and not easily deformed, so when a pair of marks are provided on this portion, its front side, and its rear side, the portion where the marks are arranged is not easily bent, and it is easy to accurately visually check the symmetry of the left and right marks.

[0027] <Method 4>

[0028] The pad-type disposable diaper according to any one of the first to third aspects, wherein:

[0029] An adhesive layer is provided on the back surface of at least one of the front and rear ends.

[0030] (Effect)

[0031] After the first fixing area and the second fixing area are fixed to the inner surface of the underwear in a state where at least one of the front and rear ends of the diaper protrudes from the edge of the waist opening of the underwear, if the protruding portion is left as it is, the wearing feeling and breathability may be reduced, so it is preferably folded back toward the crotch side, but it is possible to restore it by simply folding it back. In contrast, by having an adhesive layer as in this embodiment, not only can the portion of the diaper protruding from the edge of the waist opening of the underwear be folded back toward the crotch side, but the folded back portion can also be fixed to the outer surface of the underwear via the adhesive layer.

[0032] <Method 5>

[0033] The pad-type disposable diaper according to any one of the first to fourth aspects, wherein:

[0034] A plurality of easy-bending folding lines along the width direction are provided at intervals in the front-rear direction, and the easy-bending folding lines are used to fold at least one of the front and rear ends toward the back side.

[0035] (Effect)

[0036] When the first fixing area and the second fixing area are fixed to the inner surface of the underwear in a state where at least one of the front and rear ends of the diaper protrudes from the edge of the waist opening of the underwear, if the protruding portion is left as it is, the wearing feeling and breathability may be reduced, so it is preferably folded back toward the crotch side. When an easy-bend fold line is provided as in this embodiment, such folding back can be easily performed, which is preferred.

[0037] Effects of the Invention

[0038] According to the present invention, there are advantages such as a pad-type disposable diaper that can be easily fixed to an appropriate position of underwear. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a top view which shows the front side of the pad-type disposable diaper in the unfolded state.

[0040] Figure 2 It is a top view showing the back side of the pad-type disposable diaper in the unfolded state (in order to make the drawing easier to see, the symbols are omitted).

[0041] Figure 3 is along Figure 1 Sectional view along line AA.

[0042] Figure 4 is along Figure 1 Cross-sectional view of line BB in .

[0043] Figure 5 is along Figure 1 Cross-sectional view of line CC in .

[0044] Figure 6 This is a perspective view schematically showing how to use a pad-type disposable diaper.

[0045] Figure 7 It is a top view showing the back side of the pad-type disposable diaper in the unfolded state.

[0046] Figure 8 It is a top view showing the back side of the pad-type disposable diaper in the unfolded state.

[0047] Fig. 9 (a) is a cross-sectional view schematically showing the fixed state of the first fixed area, Fig. 9 (b) is a cross-sectional view schematically showing the fixed state of the second fixed area.

[0048] Fig.10 This is a front view schematically showing underwear to which a pad-type disposable diaper is attached.

[0049] Fig.11 It is a cross-sectional view of the folded portion.

[0050] Fig.12 It is a top view showing the back side of the pad-type disposable diaper in the unfolded state.

[0051] Fig.13 It is a side view which schematically shows the end part of the pad type disposable diaper in the front-back direction. DETAILED DESCRIPTION

[0052] Hereinafter, examples of the pad-type disposable diaper will be described with reference to the drawings. Figure 1 to Figure 5 A pad-type disposable diaper 200 is shown. The pad-type disposable diaper 200 includes a crotch portion M including a center 201 in the front-back direction LD, a front portion F1 extending forward from the crotch portion M, and a rear portion B1 extending rearward from the crotch portion M. The dimensions of each portion can be appropriately determined, for example, the product total length (length in the front-back direction) L1 can be approximately 200 to 480 mm, and the total width W1 can be approximately 120 to 200 mm. Regarding the crotch portion M, when the absorbent body 23 has a narrowing portion 23n described later, it refers to the range in the front-to-back direction LD having the narrowing portion 23n; when the absorbent body 23 does not have the narrowing portion 23n but has a narrowing portion in the middle of the product in the front-to-back direction LD whose width is narrower than the front and rear sides (because it is a well-known shape like an hourglass, it is omitted in the illustration), it refers to the range in the front-to-back direction LD having the narrowing portion; when neither the absorbent body 23 nor the product shape has a narrowing portion, it refers to the portion located in the center in the front-to-back direction LD, and refers to the portion whose dimension in the front-to-back direction LD is 20 to 40% of the total length of the product.

[0053] The pad-type disposable diaper 200 has: an absorbent body 23, which is built-in over the front part F1, the crotch part M and the back part B1; a liquid-permeable top sheet 22, which covers the front side of the absorbent body 23; and a liquid-impermeable sheet 21, which covers the back side of the absorbent body 23. The materials and characteristic parts of each part are described in turn below. In addition, as the non-woven fabric in the following description, a well-known non-woven fabric can be appropriately used according to the part and purpose. As the constituent fibers of the non-woven fabric, for example, in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides (composite fibers such as core sheaths in addition to single-component fibers), regenerated fibers such as rayon or cuprammonium fibers, natural fibers such as cotton, etc. can be selected without particular limitation, and they can also be mixed and used. In order to improve the softness of the non-woven fabric, it is preferred that the constituent fibers are curled fibers. In addition, the constituent fibers of the nonwoven fabric may be either hydrophilic fibers (including hydrophilic fibers having hydrophilicity with the aid of a hydrophilic agent), or hydrophobic fibers or water-repellent fibers (including water-repellent fibers having water repellency with the aid of a water-repellent agent). In addition, nonwoven fabrics are generally classified into short-fiber nonwoven fabrics, long-fiber nonwoven fabrics, spunbonded nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, hot-rolled (hot air) nonwoven fabrics, needle-punched nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (SMS nonwoven fabrics and SMMS nonwoven fabrics having meltblown layers sandwiched between spunbonded layers, etc.), etc., according to the fiber length, sheet forming method, fiber bonding method, and laminated structure, and any of these nonwoven fabrics may be used.

[0054] As the absorbent body 23, a material mainly composed of a pulp fiber mass, an aggregate of filaments such as cellulose acetate, or a nonwoven fabric, and mixed and fixed with a superabsorbent polymer as needed is used. As needed, the absorbent body 23 may be wrapped with crepe paper or a nonwoven fabric (not shown). In addition, the shape of the absorbent body 23 can be a suitable shape such as a rectangle, but in the example shown in the figure, it is a shape (roughly an hourglass shape) having a narrowed portion 23n narrower in width than the front and rear sides in the crotch portion M. The fiber weight per unit area of ​​the absorbent body 23 and the absorbent polymer weight per unit area can be appropriately determined, but the fiber weight per unit area is preferably about 100 to 600 g / m 2 In addition, the weight per unit area of ​​the absorbent polymer is preferably about 0 to 400 g / m 2 .

[0055] A liquid-impermeable sheet 21 is provided on the back side of the absorbent body 23. As the liquid-impermeable sheet 21, in addition to polyethylene film, a sheet having moisture permeability without impairing water barrier properties can be used from the viewpoint of preventing stuffiness. The water-blocking and moisture-permeable sheet can be a porous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching it in a uniaxial or biaxial direction. In the example shown in the figure, the liquid-impermeable sheet 21 extends around the absorbent body 23, but it does not have to extend around the absorbent body 23.

[0056] The outer surface (back surface) of the liquid-impermeable sheet 21 is covered with an exterior sheet 25. As the exterior sheet 25, various nonwoven fabrics can be used.

[0057] The front side of the absorbent body 23 is covered by the top sheet 22. In the example shown in the figure, a part of the absorbent body 23 extends from the side edge of the top sheet 22, but the width of the top sheet 22 may be expanded so that the side edge of the absorbent body 23 does not extend. As the top sheet 22, a porous or non-porous nonwoven fabric, a porous plastic sheet, etc. are used.

[0058] The front and rear ends of the pad-type disposable diaper 200 are formed into end wings EF which extend forward and backward from the front and rear ends of the absorbent body 23, respectively, and where the absorbent body 23 does not exist. The material constituting the end wings EF is not particularly limited, and in the example shown in the figure, the end wings EF are formed into portions extending forward and backward from the liquid-impermeable sheet 21, the outer sheet 25, and the top sheet 22 to the absorbent body 23.

[0059] In addition, the side parts of the pad-type disposable diaper 200 are formed into side wings SF which extend laterally from the side edges of the absorbent body and do not have the absorbent body 23. The material constituting the side wings SF is not particularly limited, and in the example shown in the figure, the side wings SF are formed into portions extending to both sides of the width direction WD of the absorbent body 23 among the liquid-impermeable sheet 21, the outer sheet 25, the top sheet 22, and the pleated sheet 62. In addition to the hot melt adhesive indicated by dots in the figure, the bonding of materials including these portions can be performed by material welding such as heat sealing and ultrasonic sealing.

[0060] (Stand-up pleats)

[0061] In order to block urine and soft feces moving laterally on the top sheet 22 and prevent side leakage, on both sides of the width direction WD on the front of the disposable diaper, there are standing pleats 60 that stand up (protrude) from the side of the top sheet 22 toward the skin side throughout the entire front-to-back direction.

[0062] The standing gather portion 60 shown in the example of the figure has: a root portion 65 fixed to a region including the side flap SF; a protruding portion 66 extending from the root portion 65; a lying portion 67 formed by fixing both ends of the protruding portion in a lying state in the front-back direction; an unfixed standing portion 68 located between the front and back lying portions in the protruding portion 66; and a gather elastic member 63 fixed to at least the terminal portion of the standing portion 68 in a state of being stretched in the front-back direction. The standing gather portion 60 is formed by a gather sheet 62 folded back at the terminal, and the gather elastic member 63 may be provided with only one gather elastic member on each side in addition to being provided with a plurality of gather elastic members at intervals on each side as shown in the example of the figure. The elongation of the portion having the gather elastic member 63 is not particularly limited, but is usually preferably 150 to 350%, and more preferably 200 to 300%.

[0063] The root portion 65 of the standing gather 60 shown in the figure is provided only on the side flap SF and joined to the side of the liquid-impermeable sheet 21 and the side of the outer sheet 25 , but it may extend from the side flap SF to the side of the region overlapping with the absorbent body 23 .

[0064] The two ends of the protruding portion 66 of the standing gather 60 in the front-back direction LD become the lying portions, but the portion between the lying portions becomes the unfixed standing portion 68, and the standing portion 68 stands up due to the contraction force of the gather elastic member 63. When the diaper is worn, the diaper is worn on the body in a boat shape, and the contraction force of the gather elastic member 63 acts, so the standing gather 60 stands up due to the contraction force of the gather elastic member 63 and elastically adheres to the leg circumference. As a result, the so-called side leakage from the leg circumference can be prevented.

[0065] As the material of the pleated sheet 62, a plastic sheet or a melt-blown nonwoven fabric may be used, but in terms of the touch with the skin, it is preferable to use a material obtained by water-repellent treatment of the nonwoven fabric with silicone, etc. As the pleated elastic member 63, a commonly used material such as styrene rubber, olefin rubber, polyurethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, polyester, etc. formed into a line, rope, belt, etc. can be used.

[0066] (Side pleats)

[0067] Each side flap SF has an elongated side elastic member 64 extending in the front-to-back direction LD within the range of the front-to-back direction LD including the crotch portion M, and the region having the side elastic member 64 has a stretchable region (side pleat portion) that contracts in the front-to-back direction LD by contraction of the side elastic member 64 and can be stretched in the front-to-back direction LD. The side elastic member 64 may be provided between the liquid-impermeable sheet 21 and the outer sheet 25 in the side flap SF, in addition to being provided between the pleat sheet 62 and the liquid-impermeable sheet 21 on the outer side in the width direction WD near the starting end of the joining portion of the pleat sheet 62 as shown in the example in the figure. In addition to providing only one side elastic member 64 as shown in the example in the figure, a plurality of side elastic members 64 may be provided on each side. As the side elastic member 64, the same material as the pleat elastic member 63 can be used.

[0068] The side elastic component 64 may be present only in the stretchable region, or may be present throughout the front side, rear side, or both sides of the stretchable region. In the latter case, the side elastic component 64 is finely cut at one or more places outside the stretchable region, or is not fixed to the sheet sandwiching the side elastic component 64, or both cases, thereby forming a non-stretchable region (substantially equivalent to not having an elastic component). The range of the stretchable region in the front-to-back direction LD can be appropriately determined, but preferably includes at least the crotch portion M, and when the absorbent body 23 has a narrowing portion 23n, it preferably extends to both sides of the front-to-back direction LD to the front-to-back position roughly the same as the front and rear ends of the narrowing portion 23n.

[0069] (Adhesive layer)

[0070] like Figure 2 , Figure 3 and Figure 5 As shown in the figure, an adhesive layer 30 is provided on the back of the pad-type disposable diaper 200, that is, on the back of the outer sheet 25 in the example shown in the figure. The area located in the crotch portion M among the areas having the adhesive layer 30 is the first fixing area A1, and the area located in front and rear of the first fixing area A1 is the second fixing area A2. The adhesive layer 30 is preferably covered with a release sheet 31 in advance so as to be releasable, as shown in the example shown in the figure, and the release sheet 31 is peeled off to expose the adhesive layer 30 when in use.

[0071] In the example shown in the figure, the adhesive layer 30 is continuously provided along the front-to-back direction LD in a manner that the first fixing area A1 and the second fixing area A2 are continuous without a gap, but the adhesive layer 30 may be intermittently provided in the front-to-back direction LD in a manner that the first fixing area A1 and the second fixing area A2 are separated in the front-to-back direction LD. Therefore, the size of the first fixing area A1 in the front-to-back direction LD may be 55 to 100% of the size of the crotch portion M in the front-to-back direction LD. In addition, the size of the second fixing area A2 located at the front side of the crotch portion M in the front-to-back direction LD may be 70 to 100% of the size of the front side portion F1 in the front-to-back direction LD, and the size of the second fixing area A2 located at the rear side of the crotch portion M in the front-to-back direction LD may be 70 to 100% of the size of the rear side portion B1 in the front-to-back direction LD.

[0072] The adhesive layer 30 preferably does not overlap with the marks 41 and 42 described later, and is particularly preferably accommodated between a pair of left and right marks 41 and 42 described later, but may partially overlap with the marks 41 and 42 described later.

[0073] The adhesive layer 30 is preferably also provided on the end flap EF, and particularly preferably extends continuously from the front end to the rear end of the product as shown in the example, but may also be sized and arranged such that the entire adhesive layer 30 is accommodated in a region overlapping with the absorbent body 23 in the thickness direction.

[0074] (mark)

[0075] The characteristics are, Figure 7 As shown, at the front and rear ends of the product, a pair of left and right marks 41, 42 indicating the position in the front-to-back direction LD are provided in a manner that can be visually seen from the back side of the product. The pair of marks 41, 42 are separated from each other in the width direction WD and are linearly symmetrical about a center line 102 passing through the center of the width direction WD of the product (hereinafter, also referred to as bilateral symmetry). Figure 6 When the pad-type disposable diaper is mounted on underwear 100, as shown in Fig. 9 As shown, the crotch portion M of the diaper (usually the center in the front-to-back direction LD) is aligned with the crotch portion M of the underwear 100, and after the first fixing area A1 of the diaper located in the crotch portion M is fixed to the inner surface of the underwear 100 using the adhesive layer 30 on the back side thereof, the position of the second fixing area A2 can be confirmed using the marks 41 and 42 provided on at least one of the front and back ends of the diaper. Specifically, as Fig.10 As shown in FIG. 1 , the second fixing area A2 is aligned with the inner surface of the underwear 100 so that at least one of the front and rear ends of the diaper protrudes from the edge 110 of the waist opening of the underwear 100. Then, the protruding portion 210 is visually observed with the underwear 100 as a reference, for example, Fig.10Different from the state shown, when the number of marks 41 visible on the right side or the shape of the visible portion is different from the number of marks 42 visible on the left side or the shape of the visible portion, the second fixed area A2 is tilted. In addition, even if the number of marks 41, 42 visible on the left and right sides is the same, in the case where the center of the portion located between the marks 41, 42 on the left and right sides is offset from the center line 102 on the width direction WD of the underwear 100, the second fixed area A2 is not tilted, but the position in the width direction WD is offset. Therefore, in these cases, the position of the second fixed area A2 is adjusted so that the appearance of a pair of marks 41, 42 is symmetrical on the left and right. When the adhesive layer 30 of the second fixed area A2 is already adhered when performing this position adjustment, it is peeled off and the position is adjusted and then re-adhered. This position adjustment can be repeated as needed. In this way, by using the marks 41, 42 provided at the ends of the diaper, the second fixed area A2 can be more easily fixed to the appropriate position on the underwear 100 ( Fig.10 status).

[0076] The shapes of the marks 41 and 42 are not particularly limited as long as they can indicate the position of the portion 210 extending from the edge 110 of the waist opening of the underwear 100 in the front-to-back direction LD. They can be appropriately selected from shapes that can indicate the position, such as circles, triangles, quadrilaterals, stars, arrows, or characters, patterns, etc. A plurality of marks 41 and 42 can be provided on each side (however, since left-right symmetry is required, the same number is provided on each side). Figure 7 In the example shown, the star-shaped marks 41a, 42a and the oval-shaped marks 41b, 42b are arranged alternately and repeatedly at predetermined intervals in the front-rear direction LD. Figure 8 In the example shown, the marks 41 and 42 are arranged at regular intervals in the front-to-back direction LD in such a manner that one star-shaped mark 41a and 42a are arranged for every three rounded horizontally long rectangular marks 41c and 42c. In the example shown in the figure, a pair of marks 41 and 42 are provided not only at the front and rear ends of the product but also at the portion therebetween, but a pair of marks 41 and 42 may not be provided at portions other than the front and rear ends of the product.

[0077] In addition to being provided by printing, the marks 41 and 42 can also be provided by shape processing such as embossing, and can also be provided by combining the two. The marks 41 and 42 can be provided on any existing component as long as they can be visually seen from the back side of the pad-type disposable diaper 200, and can also be provided on a dedicated component. For example, the marks 41 and 42 can also be printed on the back side of the liquid-impermeable sheet 21, and the marks 41 and 42 can be visually seen through the outer sheet 25. In addition, a printed sheet made of paper or the like printed with the marks 41 and 42 can be sandwiched between the liquid-impermeable sheet 21 and the outer sheet 25, and the marks 41 and 42 on the printed sheet can be visually seen through the outer sheet 25. In addition, the marks 41 and 42 can also be directly printed on the back side of the outer sheet 25.

[0078] The size of each mark 41, 42 can be appropriately determined, but when considering the local part displayed and the recognizability in normal use, the size (total length) L4 in the front-to-back direction LD is preferably 2 to 20 mm, and the size (total width) W4 in the width direction WD is preferably 5 to 20 mm. In addition, when the marks 41, 42 are repeatedly arranged at intervals in the front-to-back direction LD, the center interval D4 can be appropriately determined, for example, it can be 2 to 15 mm. In addition, as long as the center interval D4 of the marks 41, 42 in the front-to-back direction LD is regular, it does not have to be fixed. For example, in the case of Fig.10 When a plurality of types of marks 41 and 42 are mixed as shown, the center interval D4 in the front-rear direction LD of different marks may be different from the center interval D4 in the front-rear direction LD of the same mark.

[0079] In particular, as shown in the example of the figure, when a pair of left and right marks 41, 42 respectively form scales arranged at regular intervals in the front-to-back direction LD, by using the marks 41, 42 as scales on the left and right sides to confirm the position of the edge 110 of the waist opening of the underwear 100, it is easier to visually check whether the appearance of the pair of marks 41, 42 is symmetrical on the left and right with respect to the underwear 100, which is preferred.

[0080] Furthermore, as shown in the example of the figure, when a strip-shaped or linear longitudinal reference mark 50 that is continuous in a straight line along the front-back direction LD together with a pair of left and right marks 41, 42 is provided at least in the portion 210 (preferably the entire length of the product) extending from the waist opening of the underwear 100, the front-back direction LD of the product can be more intuitively grasped, which is preferred. In this case, as shown in the example of the figure, when the marks 41, 42 indicating the position in the front-back direction LD are provided in the strip-shaped longitudinal reference mark 50, both marks 41, 42 can be visually seen at once, and it is easy to direct the line of sight toward the marks 41, 42 indicating the position in the front-back direction LD, which is particularly preferred.

[0081] In particular, dimension 50w of longitudinal reference mark 50 in the width direction can be appropriately determined, but is usually preferably approximately 7 to 30 mm.

[0082] In order to accurately confirm the position of the second fixed area A2, the separation distance between the pair of marks 41 and 42 in the width direction ED is preferably large. However, as shown in the example, in the case of a pad-type disposable diaper 200 having a side wing SF, the side wing SF is easily deformed. Therefore, when a pair of marks 41 and 42 are set on the side wing SF, it is possible that the configuration portion of the marks 41 and 42 is bent and it is difficult to accurately visually check the symmetry of the left and right marks 41 and 42. In contrast, the area with the absorbent body 23 is a relatively rigid and non-deformable portion. Therefore, when a pair of marks 41 and 42 are respectively set at positions corresponding to the two ends of the area with the absorbent body 23 in the width direction WD (the portion overlapping the two ends of the absorbent body 23, its front side, and its rear side), as shown in the example, the configuration portion of the marks 41 and 42 is not easy to bend, and it is easy to accurately visually check the symmetry of the positions of the left and right marks 41 and 42.

[0083] If the portion 210 of the diaper 200 extending from the edge 110 of the waist opening of the underwear 100 is left as it is, the wearing feeling and breathability may be reduced, so it is preferably folded back toward the crotch side, but it is possible to restore it by simply folding it back. Therefore, as shown in the example in the figure, it is preferable to have an adhesive layer 30 on the back side of at least one of the front end and the rear end of the pad-type disposable diaper 200. In this way, not only can the portion 210 of the diaper extending from the edge 110 of the waist opening of the underwear 100 be folded back toward the crotch side, but the folded portion can also be Fig.11 In this way, the adhesive layer 30 is fixed to the outer surface of the underwear 100 .

[0084] When the portion 210 extending from the edge 110 of the waist opening of the underwear 100 in the diaper is folded back, Fig.12 and Fig.13 As shown in the figure, it is preferred that a plurality of easy-bend fold lines 211 for folding the part back to the back side are provided at intervals in the front-back direction LD and are continuous in the width direction WD, because the operation becomes easy. The easy-bend fold line 211 is a portion processed so that the folding back to the back side becomes easy due to its existence, and examples thereof include embossed processing lines and punched lines that form a concave portion on the back side of the object part and a convex portion or a concave portion on the front side. In addition to being provided in the end flap EF as shown in the example in the figure, the easy-bend fold line 211 can also be provided in the region having the absorbent body 23 at the same time or instead thereof (not shown).

[0085] <Explanation of terms used in this manual>

[0086] Unless otherwise specified in the specification, the following terms in the specification have the following meanings.

[0087] The “front-rear direction” refers to the direction (longitudinal direction) indicated by the symbol LD in the figure, and the “width direction” refers to the direction (left-right direction) indicated by WD in the figure. The front-rear direction is perpendicular to the width direction.

[0088] The “front side” refers to the side closer to the skin of the wearer when worn, and the “back side” refers to the side farther from the skin of the wearer when worn.

[0089] The “front side” refers to the side of the component that is closer to the skin of the wearer when worn, and the “back side” refers to the side that is farther from the skin of the wearer when worn.

[0090] "Elongation" means a value when the natural length is 100%. For example, an elongation of 200% is equivalent to an elongation of 2 times.

[0091] "Gel strength" was measured as follows. 1.0 g of a superabsorbent polymer was added to 49.0 g of artificial urine (a mixture of urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt% and ion exchange water: 97.09 wt%), and stirred with a stirrer. The resulting gel was placed in a constant temperature and humidity chamber at 40°C x 60% RH for 3 hours, then returned to room temperature, and the gel strength was measured using a curdmeter (manufactured by I.techno Engineering: Curdmeter-MAX ME-500).

[0092] ·The "weight per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device under standard conditions (temperature of 23±1°C and relative humidity of 50±2% in the test site) to make it a constant state. Pre-drying means making the sample or test piece a constant in an environment with a temperature of 100°C. In addition, for fibers with an official regain of 0.0%, pre-drying is not required. Use a template (100mm×100mm) for sample selection to cut a sample of 100mm×100mm size from the test piece in a constant state. Measure the weight of the sample and multiply it by 100 to calculate the weight per square meter as the weight per unit area.

[0093] "Thickness" is measured using an automatic thickness gauge (KES-G5 portable compression measurement program) at a load of 0.098N / cm 2 And the pressure area is 2cm 2 Automatically determined under the conditions of

[0094] The "expanded state" refers to a state in which the garment is flatly expanded without any contraction (including any contraction such as contraction of elastic members) or slack.

[0095] · Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the natural length state.

[0096] In the absence of any description of the environmental conditions for the test or measurement, the test or measurement was conducted in a test room or device under standard conditions (temperature of 23±1°C and relative humidity of 50±2% in the test site).

[0097] Industrial Applicability

[0098] The present invention can be applied to a pad-type disposable diaper having an adhesive layer on the back surface.

[0099] Description of symbols

[0100] A1: 1st fixing area; A2: 2nd fixing area; B1: back part; F1: front part; LD: front-to-back direction; M: crotch part; EF: end flap; SF: side flap; WD: width direction; 21: liquid-impermeable sheet; 22: top sheet; 23: absorbent body; 23n: narrowing part; 25: outer sheet; 30: adhesive layer; 31: peeling sheet; 41, 42: mark; 50: longitudinal reference mark; 60: standing pleat part; 64: side elastic part; 100: underwear; 102: center line; 110: edge of waist opening; 200: pad-type disposable diaper; 210: protruding part; 211: easy-bending line.

Claims

1. A pad-type disposable diaper, The pad-type disposable diaper comprises: a crotch portion including a center in the front-back direction; a front side portion extending toward the front side than the crotch portion; and a rear side portion extending toward the rear side than the crotch portion. The pad-type disposable diaper has an absorbent body extending over the front side portion, the crotch portion, and the back side portion. The pad-type disposable diaper comprises: end wings where the absorbent body is not present, the end wings being portions extending forward and rearward from the front and rear ends of the absorbent body, and side wings where the absorbent body is not present, the side wings being portions extending laterally from the side edges of the region where the absorbent body is present. The pad-type disposable diaper comprises: a first fixing region located in the crotch portion; and a second fixing region located in front of and behind the first fixing region. An adhesive layer is provided on the back of the first fixing area and the second fixing area. At least one of the front and rear ends is fixed to the underwear in a state of extending from the edge of the waist opening of the underwear. The pad-type disposable diaper is characterized in that A pair of left and right marks indicating the position in the front-rear direction are provided at at least one of the front and rear ends so as to be visible from the back side of the product. The pair of left and right marks are separated from each other in the width direction and are linearly symmetrical about a center line passing through the center of the product in the width direction. In addition, the pair of left and right marks are separated from the two side edges of the pad-type disposable diaper toward the center side in the width direction and are respectively arranged only at positions corresponding to the two end portions in the width direction of the area having the absorbent body.

2. The pad-type disposable diaper according to claim 1, in, The pad-type disposable diaper comprises: a top sheet covering the front side of the absorbent body; a liquid-impermeable sheet provided on the back side of the absorbent body; and an outer sheet covering the back side of the liquid-impermeable sheet. The top sheet, the liquid-impermeable sheet, and the outer sheet have portions extending toward both the front and rear sides of the absorbent body. The end flaps are formed by portions of the top sheet, the liquid-impermeable sheet, and the outer sheet that extend toward both the front and rear sides of the absorbent body. The absorbent body has a narrowed portion in the crotch portion that is narrower than the front and rear sides. The pad-type disposable diaper has a pair of left and right longitudinal reference marks that are continuous in a straight line and in a strip shape along the front-back direction, the longitudinal reference marks are continuous over the entire length of the pad-type disposable diaper, and the entire width direction of the longitudinal reference marks overlaps with the absorbent body in a portion overlapping with a portion of the absorbent body that is closer to the front side than the narrowed portion and a portion of the absorbent body that is closer to the rear side than the narrowed portion. The pair of left and right marks are scales arranged at regular intervals in the front-rear direction, respectively, in the pair of left and right longitudinal reference marks. The pair of left and right marks and the pair of left and right longitudinal reference marks are printed on the liquid-impermeable sheet, the exterior sheet, and a printed sheet interposed between the liquid-impermeable sheet and the exterior sheet.

3. The pad-type disposable diaper according to claim 1 or 2, in, An adhesive layer is provided on the back surface of at least one of the front and rear ends.

4. The pad-type disposable diaper according to claim 1 or 2, in, A plurality of easy-bending folding lines along the width direction are provided at intervals in the front-rear direction, and the easy-bending folding lines are used to fold at least one of the front and rear ends toward the back side.

5. The pad-type disposable diaper according to claim 3, in, A plurality of easy-bending folding lines along the width direction are provided at intervals in the front-rear direction, and the easy-bending folding lines are used to fold at least one of the front and rear ends toward the back side.

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