TW202045111A - Absorbent article - Google Patents

Abstract

To suppress deterioration of appearance due to wrinkles of an exterior nonwoven fabric. The problem is solved by an absorbent article that has an absorbent body 23, a liquid impermeable resin film 21 for covering the rear side of the absorbent body 23, and an exterior nonwoven fabric 25 for covering the rear side of the liquid impermeable resin film 21, wherein the exterior nonwoven fabric 25 is adhered to the liquid impermeable resin film 21, designs 40-43 are printed on the liquid impermeable resin film 21, and the designs 40-43 can be viewed from a product outer surface through the exterior nonwoven fabric 25, and wherein a region overlapping at least a portion of the designs 40-43 is a non-adhesion region 10 in which the exterior nonwoven fabric 25 and the liquid impermeable resin film 21 are not adhered.

Description

Absorbent articles

The present invention relates to an absorbent article, such as men’s underwear or women’s underwear, such as men’s underwear or women’s underwear, such as men’s underwear or women’s underwear. .

Absorbent articles such as disposable diapers or sanitary napkins, as basic components, include an absorber, a liquid-permeable top sheet covering the surface side of the absorber, and a liquid-permeable liquid impermeable covering the back side of the absorber性resin film. In addition, in order to make the outer surface of the product a cloth-like skin feel, the back side of the liquid-impermeable resin film is often covered with an outer non-woven fabric. At this time, a non-woven fabric and a liquid-impermeable resin film are generally applied to the exterior, and the hot-melt adhesive is used to bond the two over the entire area.

On the other hand, in absorbent articles, patterns used for decoration (characters that include pictures or single-dot patterns), usage methods or usage aids, size and other functional expressions, or manufacturer or product names, characteristic functions and other marks The pattern shown is printed on the liquid-impermeable resin film, and this pattern can often be visually recognized from the outside of the product through the outer non-woven fabric (for example, refer to Patent Document 1).

However, in conventional absorbent articles, fine wrinkles are formed on the outer nonwoven fabric, and the wrinkles become conspicuous when the pattern is used as a background, or the appearance of the pattern is damaged.

[Prior Technical Literature] (Patent Document) Patent Document 1: Japanese Patent Application Publication No. 2019-63004

[The problem to be solved by the invention] Therefore, the main problem to be solved by the present invention is to suppress the deterioration of the appearance due to the wrinkles of the outer nonwoven fabric.

[Technical means to solve the problem] As a result of investigating the causes of wrinkles in the outer non-woven fabric, the inventors have learned that if the liquid-impermeable resin film and the outer non-woven fabric are bonded together under tension during manufacture, the tension will be released. Compared with the exterior non-woven fabric, the liquid-impermeable resin film shrinks significantly, resulting in a large number of small wrinkles on the exterior non-woven fabric. The absorbent articles described below are absorbent articles that solve the above-mentioned problems based on this knowledge.

>First aspect> An absorbent article comprising: an absorbent body, a liquid-impermeable resin film covering the back side of the absorbent body, and an outer non-woven fabric covering the back side of the liquid-impermeable resin film; The outer non-woven fabric is bonded to the liquid-impermeable resin film, and a pattern is printed on the liquid-impermeable resin film, and the pattern can be visually recognized from the outside of the product through the outer non-woven fabric; The absorbent article is characterized by: The area overlapping at least a part of the aforementioned pattern is a non-adhesive area where the aforementioned non-woven fabric and the aforementioned liquid-impermeable resin film are not adhered.

(Effect) In this absorbent article, the area overlapping at least a part of the pattern is a non-adhesive area where the outer nonwoven fabric and the liquid impermeable resin film are not adhered. Therefore, when manufactured, even if compared to the outer Non-woven fabrics and liquid-impermeable resin films will shrink more significantly, at least in the non-adhesive area, the outer non-woven fabric will not form wrinkles. Therefore, at least in the non-adhesive area, the wrinkles of the outer non-woven fabric will not become conspicuous with the pattern as a background or deteriorate the appearance of the pattern.

>Second Aspect> The absorbent article according to the first aspect, wherein the liquid-impermeable resin film and the outer non-woven fabric extend throughout the front and rear edges of the absorbent article; The aforementioned pattern is printed on the aforementioned liquid-impermeable resin film in the front end and rear end of the absorbent article; The front end and the rear end of the absorbent article are made into adhesive areas where the outer non-woven fabric and the liquid impermeable resin film are adhered.

(Effect) In most absorbent articles such as pad type absorbent articles or adhesive-type disposable diapers, the liquid-impermeable resin film and outer non-woven fabrics mostly extend across the front and rear edges of the articles, and most of them are printed on the front and rear ends of the articles. pattern. In such an absorbent article, in order to prevent wrinkles in the outer nonwoven fabric, it is preferable to provide the non-adhesive area to the front and rear ends of the article. However, at this time, the gap between the exterior non-woven fabric and the liquid-impermeable resin film may open at the front and rear ends of the article, which may cause deterioration in appearance or wearing feeling. Therefore, as in this aspect, it is preferable that even if there is a pattern on the front and rear ends of the article, it is not made as a non-adhesive area, but as an adhesive area.

>The third aspect> The absorbent article according to the first aspect or the second aspect, wherein the liquid-impermeable resin film and the outer non-woven fabric extend across both sides of the absorbent article; The aforementioned design is printed on the aforementioned liquid-impermeable resin film on both sides of the absorbent article; Both sides of the absorbent article are made into adhesive areas where the outer nonwoven fabric and the liquid impermeable resin film are adhered.

(Effect) In most absorbent articles such as pad-type absorbent articles or adhesive-type disposable diapers, liquid-impermeable resin films and exterior non-woven fabrics mostly extend across the sides of the article, and most of them are printed on both sides of the article. There are patterns. In such an absorbent article, in order to prevent wrinkles in the outer nonwoven fabric, it is preferable to provide non-adhesive areas to both sides of the article. However, at this time, the gap between the exterior non-woven fabric and the liquid-impermeable resin film may open on both sides of the article, which may cause deterioration of the appearance or wearing feeling. Therefore, as in this aspect, it is preferable that even if there are patterns on both sides of the article, it is not made as a non-adhesive area, but as an adhesive area.

>Fourth aspect> The absorbent article according to any one of the first aspect to the third aspect, wherein between the liquid-impermeable resin film and the outer nonwoven fabric, or between the liquid-impermeable resin film On the surface side, an elastic member is fixed, and the fixed part of the elastic member becomes a stretchable area that shrinks together with the elastic member; The aforementioned pattern is printed on the aforementioned liquid-impermeable resin film in the aforementioned stretchable area; The expansion and contraction area is an adhesive area where the outer non-woven fabric and the liquid impermeable resin film are adhered.

(Effect) In most absorbent articles such as pad-type absorbent articles or adhesive-type disposable diapers, between the liquid-impermeable resin film and the outer nonwoven fabric, or on the surface side of the liquid-impermeable resin film, Most of the elastic members are fixed to form a stretchable area, and most of them also have a pattern printed in the stretched area. In such an absorbent article, in order to prevent wrinkles in the outer nonwoven fabric, it is preferable to provide the non-adhesive area to the stretchable area. However, at this time, it becomes impossible to fix the elastic member, and the wrinkles formed in the stretchable region may unnecessarily become larger and become irregular. Therefore, as in this aspect, it is preferable that even if the stretchable area has a pattern, it is not made as a non-bonding area, but as a bonding area.

>Fifth aspect> The absorbent article as described in any one of the first aspect to the fourth aspect, which is a cushion-type absorbent article having: a crotch including the center in the front-rear direction, which is further forward than the center in the front-rear direction The front side portion of the lateral extension, and the rear side portion extending to the rear side than the center in the front-rear direction; An adhesive layer is provided on the back of the aforementioned exterior non-woven fabric; The aforementioned pattern is printed on the aforementioned liquid-impermeable resin film in the area with the aforementioned adhesive layer; The area with the adhesive layer is made into an adhesive area where the outer non-woven fabric and the liquid impermeable resin film are adhered.

(Effect) Among the pad type absorbent articles, there is known a pad type absorbent article that is installed on the inner surface of underwear and used for the purpose of reducing the cost of changing diapers or toilet training. Generally speaking, an adhesive layer is provided on the back of a cushion-type absorbent article that is fixed to underwear. By adhering this adhesive layer to the inner surface of a diaper or underwear, it is possible to prevent deviations during wearing. shift. In such a cushion type absorbent article, in order to prevent wrinkles in the outer nonwoven fabric, it is preferable to provide the non-adhesive area to the area having the adhesive layer. However, at this time, the non-woven fabric with an adhesive layer outside the liquid-impermeable resin film will be offset relative to its fixed object, which may result in cushion-type absorbency due to the adhesive layer The anti-offset function of the article is not sufficient. Therefore, as in the present aspect, it is preferable that even if there is a pattern in the area with the adhesive layer, it is not made as a non-adhesive area but as an adhesive area.

>Sixth aspect> The absorbent article according to any one of the first aspect to the fifth aspect, wherein a test body is first prepared in which the front and rear edges of the non-woven exterior fabric and the liquid-impermeable resin film are the same, and The outer non-woven fabric and the liquid-impermeable resin film maintain the adhered state of the product. Then, the outer non-woven fabric and the liquid-impermeable resin film of the test body are removed, and the aforementioned non-woven fabric and the liquid-impermeable resin film are measured in the unfolded state. When the dimensions of the front and back direction of the exterior nonwoven fabric alone, and the dimensions of the front and back direction of the liquid impermeable resin film alone, The ratio of the size of the liquid-impermeable resin film alone in the front-rear direction relative to the size of the outer nonwoven fabric alone in the front-rear direction is 97.5 to 99.0%.

(Effect) The liquid-impermeable resin film and the exterior nonwoven fabric are not particularly limited, but when the difference in shrinkage ratio is large, wrinkles are particularly likely to occur on the exterior nonwoven fabric. Therefore, in the case of the combination of a liquid-impermeable resin film and an exterior nonwoven fabric as shown in this aspect, if the aforementioned non-adhesive area is provided, the wrinkle suppression effect will be particularly prominent (its technical significance becomes greater) .

[Effects of the invention] According to the present invention, there is an advantage that it is possible to suppress the deterioration of the appearance due to wrinkles of the outer nonwoven fabric.

Hereinafter, an example of a pad type disposable diaper will be described with reference to the drawings. 1 to 5 show a pad type disposable diaper 200. The dotted part in the cross-sectional view represents the adhesive as a joining means for joining the constituent members located on the front and back sides. The hot melt adhesive is applied on the entire surface, bead, and curtain. Curtain coating, key part coating or spiral coating, or pattern coating (transfer of hot-melt adhesive using the relief method), etc., or alternatively or in combination, in the fixed part of the elastic member The upper surface is formed by applying a hot-melt adhesive on the outer peripheral surface of the elastic member by applying a comb gun or an elastic coating nozzle (Sure Wrap). The hot-melt adhesive is not particularly limited. Existing types such as EVA (ethylene-vinyl acetate copolymer), adhesive rubber (elastic system), olefin, polyester, and polyamide can be used. The hot melt adhesive. As a joining means for joining the constituent members, a raw material welding means such as heat sealing and ultrasonic sealing can be used.

The pad-type disposable diaper 200 has a crotch M including the center 201 in the front-rear direction LD, a front side portion F1 that extends forward from the center 201 in the front-rear direction LD, and a rear side portion F1 from the center 201 in the front-rear direction LD The side extends the rear side portion B1. The size of each part can be determined suitably, for example, it can be set as the full length (front-rear direction length) L1 of an article about 200-480 mm, and the full width W1 about 120-200 mm.

The pad type disposable diaper 200 has: an absorber 23 enclosed in a range including the crotch M, a liquid-permeable top sheet 22 covering the surface side of the absorber 23, and a back side covering the absorber 23 The liquid-impermeable resin film 21. Below, the raw materials and characteristic parts of each part are explained in order. In addition, as the non-woven fabric in the following description, a conventional non-woven fabric can be appropriately used according to the location and purpose. As the constituent fibers of the nonwoven fabric, in addition to synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene (in addition to single-component fibers, composite fibers such as core and sheath) can be selected. Regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used without particular limitation, and these fibers can also be used in combination. In order to improve the flexibility of the nonwoven fabric, it is preferable to use the constituent fibers as crimped fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers that are hydrophilic by a hydrophilic agent), hydrophobic fibers, or water-repellent fibers (including water-repellent fibers that are water-repellent by a water-repellent agent). ). In addition, non-woven fabrics are generally classified into short-fiber non-woven fabrics, long-fiber non-woven fabrics, spunbonded non-woven fabrics, melt-blown non-woven fabrics, spunlace non-woven fabrics, and thermally bonded (hot air) non-woven fabrics based on fiber length, sheet forming method, fiber bonding method, and laminated structure. , Needle-punched non-woven fabrics, point-bonded non-woven fabrics, laminated non-woven fabrics (SMS non-woven fabrics, SMMS non-woven fabrics formed by sandwiching a meltblown layer between spunbond layers), etc., can also use any of these non-woven fabrics.

As the absorber 23, an absorber made of a fibrillated body of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric as a base, and mixed and cemented with a superabsorbent polymer according to need can be used. body. According to need, the absorber 23 can be covered with creped paper or non-woven fabric (not shown). In addition, the shape of the absorber 23 can be made into an appropriate shape such as a rectangular shape, but in the illustrated example, it is made to have a narrower width than the width of the front and rear sides in the range including the crotch M in the front and back direction LD. The shape of the portion 23n (approximately an hourglass shape). The mass per unit area of the fibers in the absorbent body 23 and the mass per unit area of the absorbent polymer can be appropriately determined, but it is preferable to set the mass per unit area of the fiber to about 100 to 600 g/m ² ; The mass per unit area of the absorbent polymer is preferably set to about 0 to 400 g/m ² .

On the back side of the absorber 23, a liquid-impermeable resin film 21 is provided. As the liquid-impermeable resin film 21, in addition to a polyethylene film or the like, a sheet having moisture permeability can be used from the viewpoint of preventing stuffiness without impairing the water shielding property. For this water-shielding and moisture-permeable sheet, for example, a microporous sheet obtained by the following method can be suitably used: an inorganic filler is melted and kneaded in an olefin resin such as polyethylene or polypropylene to form a sheet After that, stretch in uniaxial or biaxial directions. In the illustrated example, the liquid-impermeable resin film 21 is exposed around the absorber 23, but it may not be exposed around the absorber 23.

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

The top sheet 22 covers the surface side of the absorber 23. In the illustrated example, a part of the absorber 23 is exposed from the side edge of the top sheet 22, but the width of the top sheet 22 can also be increased so that the side edge of the absorber 23 is not exposed. As the top sheet 22, a non-woven fabric with or without holes, or a plastic sheet with holes can be used.

The front and rear ends of the pad-type disposable diaper 200 respectively extend to the front and rear sides than the front and rear ends of the absorbent body 23, and the end flap parts EF without the absorbent body 23 are formed. The raw material constituting the end flap EF is not particularly limited, but in the example shown in the figure, it is the liquid-impermeable resin film 21, the exterior non-woven fabric 25, and the top sheet 22 that extend from the front and rear sides of the absorbent body 23 section.

In addition, the both sides of the pad type disposable diaper 200 become side flaps SF extending from the side of the absorbent body. The raw material constituting the side flap portion SF is not particularly limited, but in the illustrated example, it becomes the width direction of the self-absorbent body 23 in the liquid-impermeable resin film 21, the exterior nonwoven fabric 25, the top sheet 22, and the corrugated sheet 62 The part that extends out on both sides of the WD. Including these, the bonding of the raw materials can be performed by welding raw materials such as heat sealing and ultrasonic sealing in addition to the hot melt adhesive shown in the dotted part in the figure.

(Stand up wrinkles) In order to prevent urine or soft stools moving laterally on the top sheet 22 and to prevent side leakage, on both sides of the surface of the disposable diaper in the width direction WD, there are provided from the side of the top sheet 22 toward the skin throughout the front and rear directions. The standing wrinkles 60 standing up (protruding) from the side.

The standing wrinkle 60 in the example shown in the figure has: a root portion 65 fixed in the region including the side flap portion SF, a protruding portion 66 extending from the root portion 65, and both ends of the protruding portion in the front-rear direction The falling portion 67 fixed in the down state, the non-fixed rising portion 68 located between the front and back falling portions in the protruding portion 66, and at least the front end of the rising portion 68 in a state of being extended in the front-rear direction Section of the crimped elastic member 63. The standing wrinkle 60 is formed by the wrinkle sheet 62 folded back at the tip; the wrinkle elastic member 63 may be provided with a plurality of pieces separated by an interval as shown in the example, and one piece may be provided separately. . The elongation rate of the portion having the crimped elastic member 63 is not particularly limited, and it is usually 150 to 350%, and more preferably 200 to 300%.

The root portion 65 of the standing wrinkle 60 in the illustrated example is provided only on the side flap SF, and is joined to the side of the liquid-impermeable resin film 21 and the side of the exterior nonwoven fabric 25, but it may be from the side The portion SF extends to the side of the region overlapping with the absorber 23.

The protruding part 66 of the standing corrugation 60 has both ends in the front-rear direction LD become the undulated parts, and the part in between is made as a non-fixed standing part 68, which is contracted by the corrugated elastic member 63 Stand up forcefully. When the diaper is worn, the diaper is in the shape of a boat and is worn on the body, and the contraction force of the corrugated elastic member 63 works, so the contraction force of the corrugated elastic member 63 makes the erected wrinkles 60 stand up and elastically fit together In the leg circumference. As a result, so-called side leakage from the leg circumference can be prevented.

As the raw material of the wrinkle sheet 62, a plastic sheet or a melt-blown non-woven fabric can be used. However, from the viewpoint of the touch to the skin, it is preferable to use a wrinkle formed by water-repellent treatment of the non-woven fabric by silica or the like. sheet. As the crimped elastic member 63, it can be formed into a wire shape, a string shape, a belt shape, etc., and styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene can be used. Commonly used raw materials such as ethylene, styrene butadiene, silicone, and polyester.

(Side crease) Each side flap portion SF has an elongated side elastic member 64 extending in the front and rear direction LD in a range including the front and rear direction LD of the crotch M; the region having this side elastic member 64 has a side elastic member 64 The contraction area A1 (side wrinkle) that shrinks in the front-rear direction LD and can be extended in the front-rear direction LD. The side elastic member 64, as shown in the example, is provided except between the corrugated sheet 62 and the liquid-impermeable resin film 21 in the outer side of the width direction WD near the joining start end of the corrugated sheet 62. In addition, it can also be provided between the liquid-impermeable resin film 21 and the exterior nonwoven fabric 25 in the side flap SF. In addition to providing only one side elastic member 64 on each side as shown in the example, multiple side elastic members 64 may be provided on each side. As the side elastic member 64, the same material as the corrugated elastic member 63 can be used.

The side elastic member 64 may be present only in the stretchable region A1, or may be present on the front side, the rear side, or both sides of the stretchable region A1. In the latter case, in the area other than the stretchable area A1, the side elastic member 64 is cut at one place or finely cut at multiple places, and the side elastic member 64 is not fixed to the sandwiched piece, or The two are in parallel, thereby creating a non-stretching area A2 (substantially equivalent to not providing an elastic member). The range of the front-rear direction LD of the stretchable area A1 can be appropriately determined, but it is preferable to include at least the crotch portion M. When the absorbent body 23 has the gathered portion 23n, it is preferable to extend the stretchable area A1 to both sides of the front-rear direction LD. The front and rear positions are almost the same as the front and rear ends of the gathered portion 23n.

(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, the back surface of the exterior non-woven fabric 25 in the illustrated example. The adhesive layer 30, as shown in the example, is preferably covered in a peelable manner by a peeling sheet 31 in advance. When in use, the peeling sheet 31 is peeled off and the adhesive layer 30 is exposed.

In the example shown in the figure, the adhesive layer 30 is continuously provided in the front-rear direction, but it can also be provided separately in the front part F1 and the rear part B1, only on either side, or only on the crotch M, etc. The middle part of the front and rear direction. When a plurality of adhesive layers 30 are provided, it is preferable to provide at least one in each of the front part F1 and the rear part B1.

The size and arrangement of the adhesive layer 30 are preferably set in such a way that the entirety of the adhesive layer 30 is converged in the area overlapping with the absorber 23. Specifically, the width W3 of the adhesive layer 30 is preferably set to be about 60 to 80% of the width W2 of the absorbent body 23; the front-rear direction length L3 (when a plurality of ones are provided in the front-rear direction, the total length ) Is preferably about 60 to 110% of the total length L2 of the absorber 23 or about 60 to 100% of the article total length L1. The adhesive layer 30 may also extend from the area overlapping with the absorbent body 23 to the end flap EF.

(pattern) The liquid-impermeable resin film 21 is printed with patterns 40 to 43 (in the example of the figure, marks 40 and 41 described later, and a horizontal reference line 43 between the vertical reference line 42). The patterns 40 to 43 are set to be able to visually recognize the patterns 40 to 43 from the outside of the product, that is, as long as they are set to match the background color of the liquid-impermeable resin film 21 and the exterior non-woven fabric 25 (usually white, or light blue, Light green) different colors are sufficient, and there are no particular limitations on the shape and the like. Patterns 40 to 43, for example, can be made for decorative patterns (in addition to water drop patterns or patterns, but also pictures or single-dot patterns), usage methods, marks 40 (use aids), dimensions and other functions , Manufacturer or product name, mark indication of features, functions, etc., or a combination of these. The patterns 40 to 43 can also be printed on the back side of the liquid-impermeable resin film 21, but as long as they can be visually recognized from the outside of the product, they can also be printed on the surface side of the liquid-impermeable resin film 21. Surface.

The example shown in the figure is a mark 40 for determining the installation position as a pattern and printed on the liquid-impermeable resin film 21. To explain in more detail, the example shown in FIG. 7 is such that the parts of the two sides that should be located at the lowest part 101 of the underwear 100 can be visually recognized from the back side (outside) of the pad type disposable diaper 200 , Set the mark 40 for confirming the installation position. This pad type disposable diaper 200 can be installed on the underwear 100 as shown in FIG. 6. The mark 40 can be used when installing. Further, as shown in FIG. 10, after being installed on the underwear 100, before the wearer wears the underwear 100, the markings 40 on both sides of the padded disposable diaper 200 are exposed from the leg opening LO of the underwear 100, and can be exposed from the underwear 100. The outside of 100 is visually recognized to confirm whether its position is the lowermost part 101 of the underwear 100, thereby making it possible to easily confirm whether the installation position in the state of being installed on the underwear 100 is appropriate.

"It should be located at the lowermost part 101 of the underwear 100" can be appropriately determined depending on the product. However, when the shape and structure of the illustrated example are symmetrical in the front-rear direction, it can be set to the center in the front-rear direction LD. In addition, when the absorber 23 has the gathered portion 23n, the center of the gathered portion 23n in the front-rear direction can be set as "a part that should be located at the lowest part 101 of the underwear 100".

The mark 40 can be appropriately selected from marks that can indicate a position, such as a circle (example shown in FIG. 8), a triangle, a quadrangle, a star (example shown in FIG. 7), an arrow shape, or a letter. In addition to setting the mark 40 by printing, it can also be provided by shape processing such as embossing, or it can be provided by combining both. Since the mark 40 produced by embossing has unevenness, when the mark 40 is difficult to see, there is an advantage that the position of the mark 40 can be grasped by touching it by hand.

The mark 40 may be visually recognized from the back side of the pad type disposable diaper 200, and 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 side of the liquid-impermeable resin film 21, and the mark 40 can be visually recognized through the outer nonwoven fabric 25. In addition, a printed sheet made of paper or the like printed with a mark 40 may be interposed between the liquid-impermeable resin film 21 and the outer nonwoven fabric 25, and the mark 40 of this printed sheet can be visually recognized through the outer nonwoven fabric 25 . Furthermore, the mark 40 may be directly printed on the back surface of the exterior nonwoven fabric 25.

The size of the mark 40 can be appropriately determined. However, considering the part to be displayed and the visibility during normal use, the size (full length) in the front-rear direction LD is preferably 8 to 20 mm, and the size in the width direction WD ( The full width) is preferably 8-20 mm.

The position of the mark 40, the closer to the side edge, the better. Therefore, in the pad type disposable diaper 200 with side flaps SF as shown in the figure, it is preferable to provide it on the side flaps SF. As a specific dimension, the interval 40d between the side edge of the pad-type disposable diaper 200 and the mark 40 in the width direction is preferably 35 mm or less. Among them, when the side flap portion SF has a stretchable area A1 generated by the side elastic member 64, the mark 40 is preferably provided on the side more than the side edge of the condensed portion 23n and on the side than the side elastic member 64 It is closer to the center of the width direction WD. The pad type disposable diaper 200 having the gathered portion 23n and the side flap portion SF as described above, by providing the side elastic member 64 on the side flap portion SF, it becomes a boat shape in a state of being attached to the underwear, and becomes a A pad type disposable diaper with a particularly high fit around the legs. In the case of such a pad type disposable diaper 200, the side flap SF of the crotch M is exposed from the leg opening LO of the underwear 100 in the state of being attached to the underwear. However, if the part with the mark 40 is contracted by the side elastic member 64, the mark 40 may be hidden in wrinkles or the shape of the mark 40 may collapse, so that the mark 40 may not be easily recognized visually. In contrast, in the example shown in FIGS. 7 and 8, if the mark 40 is provided on the side than the side edge of the gathered portion 23n, and on the center side in the width direction WD than the side elastic member 64, then The mark 40 is not located at the deepest part where the wrinkles are formed (that is, does not overlap the side elastic member 64), so it is possible to suppress the decrease in the visibility of the mark 40. As a specific dimension, the interval 64d between the side edge of the pad type disposable diaper 200 and the side elastic member 64 in the width direction WD is preferably 15 mm or less.

As shown in FIG. 9, it is preferable that the stretchable area A1 generated by the side elastic member 64 is provided on the front and rear sides of the mark 40, and the range with the mark 40 in the front and back direction LD is made the non-stretchable area A2. In this way, if the area with the front and back direction LD of the mark 40 becomes the non-stretching area A2, the mark 40 is not easily hidden in the wrinkles and the shape of the mark 40 is not easily collapsed, so that the visual recognition of the mark 40 is good. .

On the other hand, as shown in FIG. 8, it is preferable that in the crotch portion M on both sides, an offset is provided at each position spaced apart on the front and rear sides of the mark 40 so as to be visually recognized from the back side. Move the mark 41 for confirmation. In this way, if the mark 41 for offset confirmation is provided at each position separated from the front and rear sides of the mark 40 for confirming the mounting position, as shown in FIG. 10, it is easy to know which one is forward and backward. The degree of deviation is better (wherein, Fig. 10 shows a state without deviation). For example, when viewed from the front of the underwear 100 in the state of being attached to the underwear 100, on both sides of the padded disposable diaper 200 exposed from the leg opening LO of the underwear 100, only the mark for checking the deviation can be seen In the case of 41, the fact that the installation position has shifted later will be clear at a glance. The mark 41 for checking the offset can be formed in the same shape and size as the mark 40 for checking the mounting position, using the same members and the same means.

In addition, as shown in FIGS. 7-9, the longitudinal reference lines 42 which are adjacent to the inner side of the width direction WD of each mark 40 for confirming the mounting position and extend linearly in the front-rear direction LD, and these longitudinal reference lines The horizontal reference line 43 between 42 along the part that should be located at the lowermost part 101 of the underwear 100 and linearly extending in the width direction WD is preferably provided so as to be visually recognized from the back side of the pad type disposable diaper 200 . By providing these longitudinal reference lines 42 and lateral reference lines 43, the orientation of the pad type disposable diaper 200 can be easily grasped when it is installed on the underwear 100. In addition, the longitudinal reference line 42 is adjacent to the mark 40. Therefore, the longitudinal reference line 42 will also be exposed from the leg opening LO of the underpants 100 when it has been installed in the underwear 100, so this vertical reference line 42 can be visually recognized, and in the installed state in the underwear 100 It can be easily confirmed whether the orientation of the pad type disposable diaper 200 is appropriate. The longitudinal reference line 42 and the lateral reference line 43 can be formed by using the same members and the same means as the aforementioned marking 40 for confirming the mounting position.

It is particularly preferable that the longitudinal reference line 42 has a width 42w of about 7-30 mm, and the side edge of the adhesive layer 30 is preferably the width direction of the edge of the central side relative to the width direction WD of the longitudinal reference line 42 42d of separation distance is 10mm or less, and extends linearly along the front-rear direction LD. By having such a positional relationship between the longitudinal reference line 42 and the side edge of the adhesive layer 30, the direction of the pad type disposable diaper 200 can be adjusted with the longitudinal reference line 42 as a reference, and the pad type disposable diaper can be easily discarded. The diaper 200 is installed on the underwear 100.

(Non-bonded area, bonded area) As shown in Figures 3, 4, and 7, the area overlapping with at least a part of the patterns 40 to 43 is made a non-adhesive area 10 that is not adhered to the outer nonwoven fabric 25 and the liquid-impermeable resin film 21 ( The area marked as diagonal pattern in the figure). Therefore, even if the liquid-impermeable resin film 21 shrinks more significantly than the exterior nonwoven fabric 25 during manufacture, at least in the non-adhesive region 10, wrinkles are not formed on the exterior nonwoven fabric 25. Thereby, at least in the non-adhesive region 10, the wrinkles of the exterior nonwoven fabric 25 do not become conspicuous with the patterns 40 to 43 as a background, and the appearance of the patterns 40 to 43 does not deteriorate.

Fig. 11(a) is a photograph of the sample when the area overlapping with the pattern (horizontal reference line 42) is used as the bonding area 11; Fig. 11(b) is the same pattern as that of Fig. 7 The reference line 42) is a photograph of the sample when the overlapping area is made into the non-bonding area 10. It can be seen from Fig. 11(a) that if the area overlapping with the pattern (lateral reference line 42) is used as the adhesion area between the outer non-woven fabric 25 and the liquid-impermeable resin film 21, a large number of small pieces will be formed on the outer non-woven fabric 25 The wrinkles 15 make the wrinkles 15 conspicuous and deteriorate the appearance in the area overlapping with the pattern (lateral reference line 42). On the other hand, as shown in FIG. 11(b), if there is a non-adhesive area 10 in an area overlapping the pattern (lateral reference line 42), wrinkles are not formed and deterioration of the appearance is suppressed.

If only considering the prevention of wrinkles 15 of the exterior nonwoven fabric 25, the example shown in FIG. 9 is preferably the same in the entire area overlapping with the patterns 40 to 43, or in an area wider than the entire area. There is a non-bonding area 10 in the middle. However, as described below, it is preferable to make the non-adhesive area 10 not the non-adhesive area 10 but the adhesion area 11 even in the area having the patterns 40 to 43 depending on the location.

For example, in the pad type disposable diaper 200 illustrated in the figure, the liquid-impermeable resin film 21 and the outer non-woven fabric 25 extend over the front and rear edges of the article, and are located at the front and rear ends of the pad type disposable diaper 200 Printed with patterns 40 to 43. At this time, if the non-adhesive area 10 is provided to the front and rear ends of the pad type disposable diaper 200, the gap between the outer non-woven fabric 25 and the liquid-impermeable resin film 21 will be before and after the pad type disposable diaper 200 The ends are open, which may deteriorate the appearance or wearing feeling. Therefore, as shown in FIG. 8, it is preferable that even if the liquid-impermeable resin film 21 at the front end and rear end of the pad type disposable diaper 200 is printed with patterns 40 to 43, this part is not wrong. The bonding area 10 is made as the bonding area 11 where the outer nonwoven fabric 25 and the liquid-impermeable resin film 21 are bonded. At this time, it is preferable that within a range of 20 mm from the front and rear ends of the pad type disposable diaper 200 to the center side of the front-rear direction LD, the printed part without patterns 40 to 43 occupies more than 80% of the area . The size of the adhesive region 11 in the front-rear direction LD can be appropriately determined, and can be generally set to about 2 to 40 mm. Also, as shown in the example shown in FIG. 7, when the non-adhesive area 10 is provided to the front and rear end portions of the pad type disposable diaper 200, if the width is made narrower, for example, about 2 to 30 mm, the non-adhesive area 10 The opening of the gap of the contact area 10 is not conspicuous, and it is possible to suppress the deterioration of the appearance or wearing feeling.

The same is true when the liquid-impermeable resin film 21 and the exterior nonwoven fabric 25 extend over both side edges of the article, and the patterns 40 to 43 are printed on both sides of the cushion-type absorbent article. Therefore, as shown in FIGS. 7-9, it is preferable that even if patterns 40 to 43 are printed on the liquid-impermeable resin film 21 on both sides of the pad-type disposable diaper 200, this part is not rendered wrong. The bonding area 10 is made as the bonding area 11 where the outer nonwoven fabric 25 and the liquid-impermeable resin film 21 are bonded. At this time, it is preferable that within a range of 20 mm from the side edge of the pad-type disposable diaper 200 to the center side of the width direction WD, the printed portion without the patterns 40 to 43 occupies more than 90% of the area. The dimension of the width direction WD of the adhesive region 11 can be determined suitably, and can be set to about 2-40 mm in normal cases.

In addition, the pad type disposable diaper 200 as shown in the figure, when an elastic member (side elastic member 64) is fixed on the surface side of the liquid-impermeable resin film 21 to form a stretchable area A1, When the patterns 40 to 43 are printed in the region A1, if the non-adhesive region 10 is provided in the stretchable region A1, the wrinkles 15 formed in the stretchable region A1 will unnecessarily increase and become irregular. Also, 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 area 10 is provided to the stretchable area A1, the elastic member in this part Can not be fixed. Therefore, as shown in FIGS. 7-9, it is preferable that even if the liquid-impermeable resin film 21 in the stretchable region A1 generated by the side elastic members 64 and the like is printed with patterns 40 to 43, the stretchable region A1 should also be the bonding area 11 where the exterior non-woven fabric 25 and the liquid-impermeable resin film 21 are bonded. At this time, it is preferable that in the stretchable area A1, the portion without the printed patterns 40 to 43 occupies more than 90% of the area.

In addition, the pad type disposable diaper 200 as shown in the figure is provided with an adhesive layer 30 on the back side of the outer nonwoven fabric 25 for the purpose of preventing offset, and the patterns 40 to 43 are printed to have In the area of the adhesive layer 30, if the non-adhesive area 10 is set to the area with the adhesive layer 30, the adhesive layer 30 is covered with a non-woven fabric 25, which is impermeable to its fixed object The liquid resin film 21 may shift, which may result in insufficient shift prevention function of the cushion type absorbent article implemented by the adhesive layer. Therefore, as shown in FIGS. 7 and 8, it is preferable that patterns 40 to 43 are printed on the liquid-impermeable resin film 21 in the area with the adhesive layer 30, and the area with the adhesive layer 30 The bonding area 11 where the outer nonwoven fabric 25 and the liquid-impermeable resin film 21 are bonded is also made. At this time, it is preferable that in the area with the adhesive layer 30, the portion without the printed patterns 40 to 43 occupies more than 90% of the area.

The liquid-impermeable resin film 21 and the exterior nonwoven fabric 25 are not particularly limited, but when the difference in shrinkage ratio is large, the exterior nonwoven fabric 25 is particularly likely to produce wrinkles 15. Therefore, under normal circumstances, first prepare a test body whose outer nonwoven fabric 25 and liquid impermeable resin film 21 have the same front and rear edges respectively, and the outer nonwoven fabric 25 and liquid impermeable resin film 21 maintain the product Adhesive state, then, remove the outer non-woven fabric 25 and liquid-impermeable resin film 21 of this test body, and measure the size of the outer non-woven fabric 25 in the front and back direction and the liquid-impermeable resin film in the unfolded state. 21. When the size of the front and rear direction of 21 alone, relative to the size of the front and rear direction of the outer non-woven fabric 25 alone, when the ratio of the size of the front and rear direction of the liquid impermeable resin film 21 is 97.5-99.0%, if the aforementioned non-adhesive In area 10, the effect of suppressing wrinkles 15 will be particularly prominent (that is, after releasing the tension during manufacturing, compared to the exterior nonwoven fabric 25, when the liquid-impermeable resin film 21 has a certain degree of greater When it shrinks, the technical significance of this absorbent article becomes greater). In addition, in the case of the pad type disposable diaper shown in the figure, when the front and rear edges of the outer non-woven fabric 25 and the liquid-impermeable resin film 21 are the same, the test body can be made into a product; the outer non-woven fabric 25 and liquid-impermeable In products where the front and rear edges of the non-woven resin film 21 do not match, the front and rear edges of the non-woven fabric 25 and the liquid-impermeable resin film 21 can be cut out while the non-woven fabric 25 and the liquid-impermeable resin film 21 maintain the adhesion of the product. The same test body, and use this to measure the above dimensions.

>Explanation of terms in the manual> As long as there is no special description in the specification, the following terms in the specification have the following meanings.

・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 the symbol WD in the figure, and the front-rear direction is orthogonal to the width direction.

・"Front side" refers to the side close to the wearer's skin when worn; "back side" refers to the side away from the wearer's skin when worn.

・"Surface" refers to the side of the component that is close to the wearer's skin when worn; "back" refers to the side of the component that is away from the wearer's skin when worn.

・"Elongation" refers to the value when the natural length is set to 100%. For example, the elongation of 200% means the same meaning that the elongation is 2 times.

・"Gel strength" is measured as follows. In 49.0g of artificial urine (2wt% urea, 0.8wt% sodium chloride, 0.03wt% calcium chloride dihydrate, 0.08wt% magnesium sulfate heptahydrate, and 97.09wt% ion exchange water), Add 1.0 g of super absorbent polymer and stir with a mixer. Place the resulting gel in a constant temperature and humidity tank at 40°C and 60% RH for 3 hours and then return to room temperature, and measure the gel strength with a curd meter (manufactured by I.techno Engineering: Curdmeter-MAX ME-500) .

・"Mass per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device in a standard state (the temperature of the test site is 23±1°C, and the relative humidity is 50±2%) to make it into a constant state. Pre-drying refers to making the sample or test piece constant in an environment with a temperature of 100°C. In addition, for fibers with a legal moisture content of 0.0%, preliminary drying is not required. Using a template (100mm×100mm) for sample collection, a sample with a size of 100mm×100mm was cut out from the test piece in a constant state. Measure the mass of the sample and multiply it by 100 to calculate the mass per square meter as the mass per unit area.

・"Thickness" is automatically measured with an automatic thickness measuring device (KES-G5 portable compression measurement program) under the conditions of a load of 0.098N/cm ² and a pressurized area of 2cm ² .

・"Unfolded state" refers to a state that is flat and unfolded without contraction or slack.

・As long as there is no special description, the size of each part refers to the size in the unfolded state and not in the natural long state.

・In the absence of a description of the environmental conditions in the test or measurement, the test or measurement is performed in a test room or device in a standard state (the temperature of the test site is 23±1°C, the relative humidity is 50±2%) ongoing.

[Industrial availability] The present invention can be used for pad-type absorbent articles that are fixed to the inner surface of underwear, such as pad-type disposable diapers and sanitary napkins having an adhesive layer on the back.

10: Non-bonding area 11: Bonding area 15: Folding 21: Liquid impermeable resin film 22: Top piece 23: Absorber 23n: gather part 25: Exterior non-woven fabric 30: Adhesive layer 31: Peel off sheet 40: Drawing (mark for confirming installation position) 40d: The gap between the side edge of the pad type disposable diaper and the mark in the width direction 41: Pattern (mark for offset confirmation) 42: Pattern (vertical reference line) 42d: The separation distance in the width direction of the side edge of the adhesive layer from the center side of the width direction of the longitudinal reference line 42w: the width of the vertical reference line 43: Pattern (horizontal reference line) 60: Stand up wrinkles 62: Folded sheet 63: crimped elastic member 64: Side elastic member 64d: The interval between the side edge of the pad type disposable diaper and the side elastic member in the width direction 65: root part 66: Protruding part 67: Lodging part 68: standing part 100: panties 101: lowest part 200: Padded disposable diapers 201: The center of the front and rear direction of the pad type disposable diaper A1: Telescopic area A2: Non-stretching area B1: Rear part F1: Front part LD: front and rear direction LO: leg opening M: Crotch SF: Flank WD: width direction EF: end wings W1: Full width of the item W2: the width of the absorber W3: The width of the adhesive layer L1: Full length of item L2: The full length of the absorber L3: The front and rear length of the adhesive layer A-A, B-B, C-C, D-D: section line

Fig. 1 is a plan view showing the surface side of a cushion type disposable diaper in an unfolded state. Fig. 2 is a plan view showing the back side of the cushion-type disposable diaper in an unfolded state (for the convenience of viewing the drawing, the mark is omitted). Fig. 3 is a sectional view taken along the line A-A in Fig. 1. Fig. 4 is a sectional view taken along the line B-B in Fig. 1. Fig. 5(a) is a cross-sectional view along the line C-C in Fig. 1; Fig. 5(b) is a cross-sectional view along the line D-D in Fig. 7. Fig. 6 is a perspective view schematically showing how to use the pad type disposable diaper. Fig. 7 is a plan view showing the back side of the cushion-type disposable diaper in an unfolded state. Fig. 8 is a plan view showing the back side of the cushion-type disposable diaper in an unfolded state. Fig. 9 is a plan view showing the back side of the cushion-type disposable diaper in an unfolded state. Fig. 10 is a front view schematically showing a state in which the wearer has put on underwear on which a padded disposable diaper has been attached. Fig. 11(a) is a comparative photograph of a sample of a pad type disposable diaper with wrinkles; Fig. 11(b) is a comparative photograph of a sample of a pad type disposable diaper with reduced wrinkles.

Domestic hosting information (please note in the order of hosting organization, date and number) no

Foreign hosting information (please note in the order of hosting country, institution, date and number) no

10: Non-bonding area

11: Non-bonding area

22: Top piece

23: Absorber

23n: gather part

25: Exterior non-woven fabric

30: Adhesive layer

31: Peel off sheet

40: Drawing (mark for confirming installation position)

40d: The gap between the side edge of the pad type disposable diaper and the mark in the width direction

42: Pattern (vertical reference line)

42d: The separation distance in the width direction of the side edge of the adhesive layer from the center side of the width direction of the longitudinal reference line

42w: the width of the vertical reference line

43: Pattern (horizontal reference line)

64: Side elastic member

64d: The interval between the side edge of the pad type disposable diaper and the side elastic member in the width direction

100: panties

200: Padded disposable diapers

A1: Telescopic area

A2: Non-stretching area

B1: Rear part

F1: Front part

M: Crotch

LD: front and rear direction

SF: Flank

WD: width direction

EF: end wings

EF: end wings

D-D: cut line

Claims (6)

An absorbent article comprising: an absorbent body, a liquid-impermeable resin film covering the back side of the absorbent body, and an outer non-woven fabric covering the back side of the liquid-impermeable resin film; The outer non-woven fabric is bonded to the liquid-impermeable resin film, and a pattern is printed on the liquid-impermeable resin film, and the pattern can be visually recognized from the outside of the product through the outer non-woven fabric; The absorbent article is characterized by: The area overlapping at least a part of the aforementioned pattern is a non-adhesive area where the aforementioned non-woven fabric and the aforementioned liquid-impermeable resin film are not adhered. The absorbent article according to claim 1, wherein the liquid-impermeable resin film and the outer nonwoven fabric extend throughout the front and rear edges of the absorbent article; The aforementioned pattern is printed on the aforementioned liquid-impermeable resin film in the front end and rear end of the absorbent article; The front end and the rear end of the absorbent article are made into adhesive areas where the outer non-woven fabric and the liquid impermeable resin film are adhered. The absorbent article according to claim 1 or 2, wherein the liquid-impermeable resin film and the outer non-woven fabric extend across both side edges of the absorbent article; The aforementioned design is printed on the aforementioned liquid-impermeable resin film on both sides of the absorbent article; Both sides of the absorbent article are made into adhesive areas where the outer nonwoven fabric and the liquid impermeable resin film are adhered. The absorbent article according to any one of claims 1 to 3, wherein between the liquid-impermeable resin film and the outer nonwoven fabric, or on the surface of the liquid-impermeable resin film , The elastic member is fixed, and the fixed part of the elastic member will become a stretchable area that shrinks together with the elastic member; The aforementioned pattern is printed on the aforementioned liquid-impermeable resin film in the aforementioned stretchable area; The expansion and contraction area is an adhesive area where the outer non-woven fabric and the liquid impermeable resin film are adhered. The absorbent article according to any one of claims 1 to 4, which is a cushion-type absorbent article having: a crotch portion including the center in the front-rear direction, and a front side portion extending forward from the center in the front-rear direction , And the rear part that extends to the rear side than the center in the front and rear direction; An adhesive layer is provided on the back of the aforementioned exterior non-woven fabric; The aforementioned pattern is printed on the aforementioned liquid-impermeable resin film in the area with the aforementioned adhesive layer; The area with the adhesive layer is made into an adhesive area where the outer non-woven fabric and the liquid impermeable resin film are adhered. The absorbent article according to any one of claims 1 to 5, wherein a test body is first prepared in which the front and rear edges of the outer non-woven fabric and the liquid-impermeable resin film are the same, and the outer non-woven fabric Maintain the adhesive state of the product with the aforementioned liquid-impermeable resin film, and then remove the aforementioned outer non-woven fabric and the aforementioned liquid-impermeable resin film of this test body, and measure the individual non-woven fabric of the aforementioned outer non-woven fabric in the unfolded state. In the case of the size in the front and rear direction and the size in the front and rear direction of the aforementioned liquid-impermeable resin film alone, The ratio of the size of the liquid-impermeable resin film alone in the front-rear direction relative to the size of the outer nonwoven fabric alone in the front-rear direction is 97.5 to 99.0%.

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