JP6219691B2 - Pants-type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper for adults or children.

  Conventionally, in a pants-type disposable diaper provided with an absorbent main body including an absorbent body and an exterior body fixed to the outer surface side of the absorbent main body, a belt-like sheet is provided at each of both longitudinal ends of the absorbent main body. A pants-type disposable diaper arranged and covered is known (for example, Patent Document 1).

  According to the pants-type disposable diaper described in Patent Document 1, the longitudinal end portion of the absorbent main body does not directly touch the wearer's skin, and the absorption constituting the absorbent body from the end portion of the absorbent main body Can be prevented from falling off and the feeling of use is improved.

JP 2010-82328 A

  In general, it is known that in a state where a disposable diaper is worn, the wearer is more likely to sweat the back side region than the abdominal side region. However, Patent Document 1 does not consider the sweat that was worn at the time of wearing. Thus, there is room for further improvement with respect to sweat that is easier to scrub in the dorsal region than in the ventral region.

  Therefore, this invention is providing the underpants type disposable diaper which can eliminate the fault which the prior art mentioned above has.

  The present invention relates to a pant comprising an absorbent main body divided into a ventral region, a dorsal region and a crotch region including a vertically long absorbent body, and an exterior body fixed to the non-skin facing surface side of the absorbent main body. A disposable disposable diaper, wherein both ends in the longitudinal direction of the absorbent main body are covered with the exterior body and a belt-like sheet extending in a lateral direction separate from the exterior body, and the adhesive body The pouch-type disposable diaper is fixed between the exterior body and the belt-like sheet, and the application amount of the adhesive in the dorsal region is smaller than the application amount of the adhesive in the ventral region. Is.

  According to the present invention, the longitudinal end portion of the absorbent main body does not directly touch the wearer's skin, and the absorbent polymer constituting the absorbent body from the end portion of the absorbent main body is prevented from falling off. In addition, it is considered with respect to sweat that is easier to scrub in the dorsal region than in the ventral region, and the wearing feeling is further improved.

FIG. 1 is a perspective view of a pants-type disposable diaper according to this embodiment of the present invention. FIG. 2 is a plan view of the pants-type disposable diaper shown in FIG. FIG. 3 is an enlarged plan view of a back side region of the pants-type disposable diaper shown in FIG. FIG. 4 is an enlarged plan view of the ventral region of the pants-type disposable diaper shown in FIG. 5 is a cross-sectional view taken along the line II of FIG.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings.
The pants-type disposable diaper (hereinafter also referred to as “diaper 1”) of the present embodiment is a so-called split-type pants-type disposable diaper as shown in FIGS. The diaper 1 includes an absorbent body 3 divided into a ventral region A, a back region B, and a crotch region C including a vertically long absorbent body 33, and an exterior fixed to the non-skin facing surface side of the absorbent body 3 A pants-type disposable diaper provided with a body 2. Here, the ventral region A is a region positioned on the wearer's ventral side when worn, the back region B is a region positioned on the wearer's dorsal side when worn, and the crotch region C is ventral side This is an area arranged between the area A and the back area B.
Moreover, in this specification, a "skin opposing surface" is a surface distribute | arranged to a wearer's skin side at the time of wear among front and back both surfaces of each member, such as the surface sheet 31 which mentions the absorptive main body 3 mentioned later, for example. The “non-skin-facing surface” is, for example, a surface that is directed to the side opposite to the wearer's skin side during wearing, among the front and back surfaces of each member such as a surface sheet 31 described later that constitutes the absorbent main body 3. It is.
The “Y direction” shown in each figure is a direction parallel to the center line CL extending in the longitudinal direction of the absorbent main body 3. The “X direction” shown in each figure is a direction orthogonal to the center line CL, and is also the same direction as the lateral direction of the absorbent main body 3.

  The diaper 1 is equipped with the absorptive main body 3 and the exterior body 2 located in the non-skin opposing surface side of the absorptive main body 3 as shown in FIG. And the exterior body 2 of the diaper 1 has a ventral sheet member 2A in the ventral region A and a dorsal sheet member 2B in the dorsal region B. A pair of side seal portions S is joined to the diaper 1 by joining both side portions along the longitudinal direction (Y direction) of the ventral sheet member 2A and both side portions along the longitudinal direction (Y direction) of the back side seat member 2B. , S, a waist opening WO, and a pair of leg openings LO, LO. For the joining, for example, a known joining method such as heat sealing, high frequency sealing, ultrasonic sealing, adhesive, or the like is used.

  In the diaper 1, the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B constituting the exterior body 2 are each a rectangular shape that is long in the lateral direction (X direction) when the diaper 1 is unfolded and extended (see FIG. 2). have. As shown in FIGS. 1 and 5, the abdominal sheet member 2 </ b> A and the back sheet member 2 </ b> B are both an outer layer sheet 21 that forms the outermost surface of the diaper, and an inner layer sheet disposed on the skin facing surface side of the outer layer sheet 21. 22 and a plurality of thread-like elastic members 23 disposed between the sheets 21 and 22. The outer layer sheet 21 and the inner layer sheet 22 are formed in the same shape and size, and each has a rectangular shape that is long in the lateral direction (X direction) when the diaper 1 is unfolded and extended (see FIG. 2). . The plurality of elastic members 23 extend in the lateral direction (X direction) in an extended state, and are arranged at intervals in the longitudinal direction (Y direction) of the diaper. The outer layer sheet 21 and the inner layer sheet 22 are overlapped with each other in outline, and are joined to each other by a large number of fusion parts (not shown) arranged in the form of dots. In the diaper 1, the plurality of elastic members 23 are arranged between the outer layer sheet 21 and the inner layer sheet 22 so as not to pass through the fusion part (not shown).

  As shown in FIG. 1, each of the ventral sheet member 2 </ b> A and the dorsal sheet member 2 </ b> B has a weakly functioning region in which the expansion / contraction function of the elastic member 23 is reduced in a region overlapping the absorbent main body 3. . More specifically, the plurality of elastic members 23 in the abdominal sheet member 2A and the back sheet member 2B are each divided into a plurality of portions in the region overlapping the absorbent main body 3, and the elastic members are finely divided. 23 no longer has a contracting force and forms weakly functionalized regions in the ventral seat member 2A and the back seat member 2B.

  As shown in FIG. 5, the absorbent main body 3 of the diaper 1 includes a rectangular absorbent body 33 that is long in the vertical direction (Y direction), and a liquid-permeable surface sheet disposed on the skin-facing surface side of the absorbent body 33. 31 and a liquid-impermeable back sheet 32 disposed on the non-skin facing surface side of the absorbent body 33, and as shown in FIG. 2, is formed in a rectangular shape that is long in the vertical direction (Y direction). ing.

  In the diaper 1, as shown in FIGS. 2 to 4, on both sides along the longitudinal direction (Y direction) of the absorbent main body 3, it is liquid resistant or water repellent over the entire length of the absorbent main body 3. Side cuffs 34, 34 made of a breathable material are formed. In the vicinity of the free end of each side cuff 34, a side cuff elastic member 35 is arranged in an extended state. While the diaper 1 is worn, the side cuff 34 is erected by the side cuff elastic member 35 contracting to form a gather in the crotch region C, and laterally (X direction) outward from the absorbent main body 3. The outflow of liquid to the is prevented.

The absorbent body 33 of the absorbent main body 3 includes an absorbent core (not shown) in which water-absorbing polymer particles are held in an aggregate of fibers such as pulp fibers, and a core that covers the absorbent core (not shown). It consists of a wrap sheet (not shown). In the diaper 1, the absorbent core constituting the absorbent body 33 has a thickness on the back side region B side (portion overlapping the back side sheet member 2 </ b> B of the back side region B) as shown in FIG. 5. The ventral region A is smaller than the thickness of the side region A side (the portion overlapping the ventral sheet member 2A of the ventral region A), and the dorsal region is more flexible. It is preferably 10% or more and 75% or less of the thickness of the side (the portion overlapping the ventral sheet member 2A of the ventral region A), and 15% or more and 50% or less of the thickness of the ventral region A side. Is more preferable. Specifically, the thickness of the absorbent core on the back region B side is preferably 0.5 mm or more and 6 mm or less, and more preferably 1 mm or more and 5 mm or less. Further, the thickness of the absorbent core on the ventral region A side is preferably 1 mm or more and 9 mm or less, and more preferably 2 mm or more and 7.5 mm or less. The thickness of the absorbent core is measured under no load.
In addition, in the split type diaper 1, the back side sheet | seat member 2B of the back side area | region B and the absorptive main body 3 are the absorptive core of the back side area | region B side, or the absorptive core of the abdominal area A side. This means the overlapping part or the part where the abdominal sheet member 2A in the ventral region A and the absorbent main body 3 overlap, but in the case of a disposable diaper other than the split type, a pants-type disposable diaper is deployed. In the stretched state, the exterior body 2 is divided into three equal parts in the Y direction, and divided into a dorsal region, a crotch region, and a ventral region, and the absorbent core disposed in the divided dorsal region, or the It means the absorbent core arranged in the divided ventral region.

Moreover, in the diaper 1, the absorptive core which comprises the absorber 33 has the basis weight of the back side area | region B side (the part which overlaps with the back | dorsal sheet | seat member 2B of the back side area | region B), the abdominal area A side. The basis weight of the ventral region A is smaller than the basis weight of the portion of the ventral region A that overlaps the ventral sheet member 2A and from the viewpoint of making the dorsal region more flexible. It is preferably 10% or more and 75% or less of the amount, and more preferably 20% or more and 65% or less of the basis weight on the ventral region A side. Specifically, the basis weight of the absorbent core on the back region B side is preferably 50 g / m ² or more and 500 g / m ² or less, and more preferably 75 g / m ² or more and 400 g / m ² or less. preferable. Further, the basis weight of the absorbent core on the ventral region A side is preferably 150 g / m ² or more and 900 g / m ² or less, and more preferably 200 g / m ² or more and 800 g / m ² or less.

Further, in the diaper 1, the absorbent core constituting the absorbent body 33 has a density on the back side region B side (portion overlapping the back side sheet member 2 </ b> B of the back side region B) on the ventral region A side ( From the viewpoint of making the dorsal region more flexible, the density of the ventral region A side is 10%. % Or more and 75% or less, more preferably 20% or more and 65% or less of the density on the ventral region A side. Specifically, the density of the absorbent core on the back region B side is preferably 0.01 g / cm ³ or more and 0.75 g / cm ³ or less, and 0.03 g / cm ³ or more and 0.55 g / cm. More preferably, it is ³ or less. The density of the absorbent core on the ventral region A side is preferably 0.1 g / cm ³ or more and 1 g / cm ³ or less, and preferably 0.15 g / cm ³ or more and 0.8 g / cm ³ or less. Is more preferable.

Furthermore, in the diaper 1, the absorbent body 33 on the back side region B side (portion overlapping the back side sheet member 2 </ b> B of the back side region B) has a content of absorbent polymer constituting the ventral region A. It is less than the content of the absorbent polymer constituting the absorbent body 33 on the side (the portion overlapping the ventral sheet member 2A in the ventral region A) so as to make the dorsal region more flexible. From the viewpoint of making it, it is preferably 10% or more and 75% or less of the content of the absorbent polymer on the ventral region A side, and 20% or more and 65% or less of the content of the absorbent polymer on the ventral region A side More preferably it is. Specifically, the content of the absorbent polymer on the back region B side is preferably 50 g / m ² or more and 250 g / m ² or less, and more preferably 75 g / m ² or more and 200 g / m ² or less. preferable. Further, the content of the absorbent polymer on the ventral region A side is preferably 100 g / m ² or more and 500 g / m ² or less, and more preferably 150 g / m ² or more and 400 g / m ² or less. The content of the absorbent polymer on the back region B side or the content of the absorbent polymer on the ventral region A side is measured as follows.

<Measurement method of the content of the absorbent polymer on the back region B side or the content of the absorbent polymer on the ventral region A>
Cut the ventral region A side and the dorsal region B side of the absorbent body into 5 points and 10 cm × 10 cm, respectively. When a sample of a specified size cannot be taken, the sample is cut out in a range where it can be taken, and the area of the sample is measured using an image analyzer. These samples are each dried at 90 ° C. for 8 hours or longer, equilibrated at room temperature, and weighed. Each sample is filled in a pre-weighed mesh bag, and the mesh bag is immersed in an aqueous solution containing 4% by weight ascorbic acid and 0.02% by weight riboflavin, and the aqueous solution is sufficiently contained in the sample. Make it. The mesh bag is taken out from the aqueous solution, and the sample is subjected to low molecular weight treatment with sunlight (ultraviolet rays) for 8 hours × 3 days. The components solubilized by the low molecular weight treatment are separated and removed by washing with water from the mesh bag. If the color of the absorbent polymer colored by riboflavin has not disappeared, or the slimy feeling at the time of washing with water has not disappeared, the mesh bag is immersed again in the aqueous solution, and the molecular weight reduction treatment by sunlight is repeated. . The processing is terminated when the color of the polymer has completely disappeared for all the samples and the slimy feeling at the time of washing with water has disappeared. The mesh bag is dewatered by centrifuging for 10 minutes at a speed of 800 rpm with a centrifuge. After drying at 90 ° C. for 18 hours or more and equilibrating at room temperature, the weight of the mesh bag containing the residue is weighed. The value obtained by subtracting the weight of the mesh bag from the weight after the molecular weight reduction treatment was used as the pulp fiber content in the sample, and the value obtained by subtracting the weight of the pulp fiber from the measured sample weight was converted per unit area. The value is the content of the water-absorbing polymer.

  In the diaper 1, as shown in FIG. 2, the absorbent body 33 has three slits 33d in which the forming material of the absorbent core does not exist or the basis weight of the forming material is smaller than that of other portions. Each slit 33d extends in the vertical direction (Y direction) from the back region B side to the ventral region A side, in other words, over the entire crotch region C. The three slits 33d are juxtaposed at equal intervals in the horizontal direction (X direction). In the diaper 1, the number of the slits 33d is three. However, from the viewpoint of further spreading the liquid, it is preferably 1 or more and 5 or less, and preferably 2 or more and 4 or less. Is more preferable.

  As shown in FIGS. 3 to 5, the diaper 1 is configured so that both ends 3 a and 3 b in the longitudinal direction (Y direction) of the absorbent main body 3 are separated from the exterior body 2 and the exterior body 2 in the lateral direction ( It is covered with a belt-like sheet 4 extending in the (X direction), and is fixed between the exterior body 2 and the belt-like sheet 4 via an adhesive 5. More specifically, in the diaper 1, as shown in FIG. 5, the absorbent main body 3 has the one end 3 a side on the ventral region A side overlapped with the ventral sheet member 2 </ b> A, and the non-skin facing surface is the exterior. The inner layer sheet 22 constituting the body 2A is fixed via an adhesive (not shown). And in the diaper 1, as for the absorptive main body 3, the other end part 3b side by the side of the back | dorsal area | region B has overlapped with the back | dorsal sheet | seat member 2B, The non-skin opposing surface constitutes the inner layer sheet | seat 22 which comprises the exterior body 2B. It is fixed via an adhesive (not shown). That is, in the diaper 1, the absorbent main body 3 is covered with a belt-like sheet 4 in which the skin facing surface on the one end 3a side on the ventral region A side extends in the lateral direction (X direction), and the one end 3a is an adhesive. It is fixed between the ventral sheet member 2A and the belt-like sheet 4 via 5a. And in the diaper 1, the absorptive main body 3 is covered with the belt-like sheet 4 in which the skin facing surface on the other end 3b side on the back side region B side extends in the lateral direction (X direction), and the other end 3b is It is fixed between the back sheet member 2B and the belt-like sheet 4 via an adhesive 5b.

  In the diaper 1, the belt-like sheet 4 that covers both ends 3 a and 3 b in the longitudinal direction (Y direction) of the absorbent main body 3 is in the unfolded and extended state of the diaper 1 (see FIG. 2). Alternatively, it extends over the entire region in the lateral direction (X direction) of the back seat member 2B, and has a long rectangular shape in the lateral direction (X direction). The width of the belt-like sheet 4 (the length in the Y direction) is preferably 10% or more and 60% or less, and 15% or more with respect to the length in the Y direction of the abdominal sheet member 2A or the back sheet member 2B. More preferably, it is 50% or less.

  As shown in FIG. 5, the belt-like sheet 4 covers the one end 3a on the ventral region A side of the absorbent main body 3, and is fixed to the ventral sheet member 2A via an adhesive 5a. Moreover, the strip | belt-shaped sheet | seat 4 coat | covers the other end part 3b by the side of the back | dorsal area | region B of the absorptive main body 3, and is being fixed to the back | dorsal sheet | seat member 2B via the adhesive agent 5b. Further, in the diaper 1, both end portions (both side portions along the Y direction) of the belt-like sheet 4 are formed on both side portions along the longitudinal direction (Y direction) of the ventral sheet member 2A and the longitudinal direction (Y of the back side sheet member 2B). When the two side portions along the direction) are joined to form the pair of side seal portions S, S, the two side portions of the abdominal seat member 2A and the both sides of the back seat member 2B are joined at the same time. Yes.

Regarding the adhesive 5, as shown in FIGS. 3 to 5, the application amount of the adhesive 5 b in the back region B is smaller than the application amount of the adhesive 5 a in the ventral region A. The application amount of the adhesive 5b is preferably 2/25 or more, more preferably 2/15 or more of the application amount of the adhesive 5a, from the viewpoint of further preventing the absorbent polymer from falling off and improving the wearing feeling. Preferably, the application amount of the adhesive 5a is 4/5 or less, more preferably 2/3 or less, and the application amount of the adhesive 5a is preferably 2/25 or more and 4/5 or less, Preferably they are 2/15 or more and 2/3 or less. Specifically, the coating amount of the adhesive 5b, from the same viewpoint, it is more preferable is preferably 2 g / ^{m 2} or more 10 g / ^{m 2} or less, 2 g / ^{m 2} or more 5 g / ^{m 2} or less . The coating amount of the adhesive 5a, from the same viewpoint, it is more preferable that at 5 g / ^{m 2} or more 25 g / ^{m 2} or less is preferable, 5 g / ^{m 2} or more 15 g / ^{m 2} or less. The application amount of the adhesive 5b in the back region B or the application amount of the adhesive 5a in the ventral region A is measured as follows.

<Measurement method of application amount of adhesive 5b in backside region B or application amount of adhesive 5a in ventral region A>
The strip-like sheet adhered to the ventral region A or the dorsal region B is accurately weighed after being peeled off from the exterior body and the absorbent body. Further, the area of the belt-like sheet is measured using an image analyzer. By immersing the belt-like sheet in an organic solvent mixed with isopentyl acetate and normal butyl acetate, the adhesive adhered to the belt-like sheet is washed away. The band-like sheet after washing is left to stand for about a week and dried, and then accurately weighed. The difference in weight between the belt-like sheet before and after washing is calculated and converted to a value per unit area to obtain the amount of adhesive applied.

  The application state of the adhesive 5 will be described. Each of the adhesives 5a and 5b straddles the end edges 3a1 and 3b1 in the longitudinal direction (Y direction) of the absorbent main body 3, as shown in FIGS. It is applied to the belt-like sheet 4. Specifically, in the back region B, as shown in FIGS. 3 and 5, the adhesive 5 b spans the edge 3 b 1 of the other end 3 b on the back region B side of the absorbent main body 3. 4 is applied to the non-skin facing surface. In the ventral region A, as shown in FIGS. 4 and 5, the adhesive 5 a extends over the edge 3 a 1 of the one end 3 a on the ventral region A side of the absorbent main body 3, so It is applied to the skin facing surface. Here, the adhesive 5b straddles the edge 3b1 of the other end 3b of the absorbent body 3 means that the adhesive 5b extends in the longitudinal direction (Y direction) around the edge 3b1. And that it intersects the edge 3b1. Similarly, the adhesive 5a also extends in the longitudinal direction (Y direction) around the edge 3a1 of the one end 3a of the absorbent main body 3 and intersects the edge 3a1.

As described above, the application amount of the adhesive 5b in the back region B is smaller than the application amount of the adhesive 5a in the abdominal region A. In the diaper 1, the adhesive 5b The area is lower than the application area of the adhesive 5a. The application area of the adhesive 5b is preferably 2/25 or more, more preferably 2/15 or more of the application area of the adhesive 5a, from the viewpoint of further preventing the absorbent polymer from falling off and improving the wearing feeling. The application area of the adhesive 5a is preferably 4/5 or less, more preferably 2/3 or less, and the application area of the adhesive 5a is preferably 2/25 or more and 4/5 or less, Preferably they are 2/15 or more and 2/3 or less. Specifically, the application area of the adhesive 5b is preferably 1 cm ² or more and 60 cm ² or less, and more preferably 3 cm ² or more and 40 cm ² or less from the same viewpoint. The application area of the adhesive 5a is preferably 5 cm ² or more and 80 cm ² or less, and more preferably 8 cm ² or more and 60 cm ² or less from the same viewpoint. Here, the area of the adhesive 5b being lower than the application area of the adhesive 5a means that the application line of the adhesive 5b is thinner than the application line of the adhesive 5a, and the adhesive. This means that at least one of the number of coatings 5b is smaller than the number of coatings of the adhesive 5a is satisfied.

  In the diaper 1, as shown in FIGS. 3 and 5, the adhesive 5 b in the back side region B is formed in the vicinity of the edge 3 b 1 of the other end 3 b of the absorbent body 3, and the absorbent main body 3 and the back sheet member. 2B is applied in a line that draws a spiral extending in the lateral direction (X direction) only in the entire region of the absorbent main body 3 in the lateral direction (X direction). It is preferable that the number of coating lines for drawing a spiral is one to three. In the diaper 1, two coating lines are formed. The application lines that draw these two spirals are arranged intermittently so that they partially overlap each other in the Y direction.

  In the diaper 1, as shown in FIGS. 4 and 5, the adhesive 5 a in the ventral region A is formed by the absorbent main body 3 and the ventral sheet member in the vicinity of the edge 3 a 1 of the one end 3 a of the absorbent main body 3. In the region where 2A overlaps, in other words, only in the entire lateral direction (X direction) of the absorbent main body 3, it is preferable that the number of application lines that draw a spiral is 2 to 5, in the diaper 1, Four are formed. The application lines that draw these four spirals are arranged intermittently so that they partially overlap each other in the Y direction.

  In the diaper 1, as shown in FIGS. 3 to 5, the thickness of each application line that draws the spiral of the adhesive 5 b in the back region B is the thickness of the application line that draws the spiral of the adhesive 5 a in the ventral region A. It is thinner than the thickness. Further, the number of application lines that draw the spiral of the adhesive 5b in the back region B is smaller than the number of application lines that draw the spiral of the adhesive 5a in the ventral region A. Therefore, in the diaper 1, the area of the adhesive 5b is lower than the application area of the adhesive 5a. In the diaper 1, the adhesives 5 a and 5 b are formed in a linear shape that draws a spiral as described above, but a linear shape that draws a zigzag, a linear shape that extends linearly in the X direction, It may be formed in a dot shape or an Ω shape. The application area of the adhesive 5b in the back region B or the application area of the adhesive 5a in the ventral region A is measured as follows.

<Measurement Method of Application Area of Adhesive 5b in Backside Area B or Application Area of Adhesive 5a in Abdominal Area A>
The toner is sprayed on the belt-like sheet in the ventral region A or the back region B. Excess unadhered toner that has not adhered to the adhesive on the belt-like sheet is removed by suction with a vacuum cleaner. When the application pattern of the adhesive in the area where the adhesive is applied is so-called solid coating, and the application shape is a shape that can be easily measured with a ruler or the like, such as a rectangular shape or a square shape Measure the dimensions of the region where the adhesive is applied, such as the length and width, with a ruler or the like, calculate the area, and use it as the adhesive application area. In the case where the adhesive application pattern in the area where the adhesive is applied is applied spirally or in the form of dots by spraying, etc., the area where the adhesive is applied, The area colored with toner is measured under a microscope having an image processing function. In the observation of the portion colored with the toner using a microscope, five areas of 25 mm ² are arbitrarily extracted, and the area of the portion colored with the toner is calculated in detail by observation and image processing.

The formation material of each part of the diaper 1 mentioned above is demonstrated.
As the outer layer sheet 21 and inner layer sheet 22 constituting the abdominal sheet member 2A and the back sheet member 2B constituting the exterior body 2, various kinds of sheet materials conventionally used for absorbent articles such as disposable diapers are particularly limited. It is preferable to use a nonwoven fabric. As the nonwoven fabric, an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a single layer nonwoven fabric of a melt blown nonwoven fabric, a laminated nonwoven fabric in which these layers are laminated, or the like can be used. Moreover, the sheet | seat etc. which integrated the nonwoven fabric and the film etc. can also be used as the outer layer sheet | seat 21 and the inner layer sheet | seat 22. FIG.

  The surface sheet 31, the back sheet 32, the absorbent body 33, the side cuff 34 forming sheet, and the like constituting the absorbent main body 3 are particularly limited to various types conventionally used for absorbent articles such as disposable diapers. Can be used. For example, as the surface sheet 31, a single layer or multilayer nonwoven fabric, a perforated film, or the like can be used. As the back sheet 32, a single-layer resin film or a laminate of a resin film and a nonwoven fabric can be used, and a moisture-permeable sheet is preferable from the viewpoint of air permeability. Absorbent body 33 is formed by covering an absorbent core made by holding water-absorbing polymer particles in an aggregate of fibers such as pulp fibers (which may be non-woven fabric) with a core wrap sheet made of tissue paper or the like. Can be used. As the sheet for forming the side cuffs 34, a water-repellent single layer or multilayer nonwoven fabric or the like can be used.

  Examples of the material for forming the elastic member 23 constituting the exterior body 2 and the side cuff elastic member 35 constituting the absorbent main body 3 include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, Stretchable polyolefin, polyurethane and the like can be used. As the form of the elastic member, it is preferable to use a thread-like (thread rubber etc.) or string-like (flat rubber etc.) section having a rectangular, square, circular, or polygonal cross section, or a multifilament type thread-like one. it can.

As the belt-like sheet 4, various sheet materials conventionally used for absorbent articles such as disposable diapers can be used without particular limitation, and a melt-blown nonwoven fabric is preferably used from the viewpoint of preventing sweat-absorbing liquid leakage. The basis weight of the belt-like sheet 4 is preferably 5 g / m ² or more and 30 g / m ² or less, and more preferably 10 g / m ² or more and 25 g / m ² or less.

  Each member can be fixed using an adhesive or heat fusion. As the adhesive (including the adhesive 5) to be used, any adhesive can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers. For example, a hot melt adhesive can be used. . Examples of the hot melt adhesive include blocks such as styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene-ethylene-butylene-styrene copolymer (SEBS). Copolymer-based hot melt adhesives may be mentioned. As heat fusion, if it is used for absorbent articles, such as a disposable diaper, it can use without a restriction | limiting especially, For example, a heat seal, a high frequency seal, and an ultrasonic seal can be used.

The effect at the time of using the diaper 1 of this embodiment of this invention mentioned above is demonstrated.
As shown in FIG. 5, the diaper 1 is configured such that both ends 3 a and 3 b in the longitudinal direction (Y direction) of the absorbent main body 3 are separate from the exterior body 2 and the exterior body 2 in the lateral direction (X direction). And is fixed between the exterior body 2 and the belt-like sheet 4 via adhesives 5a and 5b. Therefore, the end portions 3a and 3b of the absorbent main body 3 do not directly touch the wearer's skin, and the absorbent polymer constituting the absorbent body 33 from the end portions 3a and 3b can be prevented from falling off. , The feeling of use improves. Further, as shown in FIGS. 3 to 5, the diaper 1 has an application amount of the adhesive 5 b in the dorsal region B that fixes the belt-like sheet 4 and the adhesive 5 a in the ventral region A that fixes the belt-like sheet 4. It is less than the amount. For this reason, the dorsal region B is more breathable than the ventral region A, and is considered for sweat that is easier to scrub the dorsal region than the ventral region when worn. Further improvement.

  Moreover, in the diaper 1, each adhesive agent 5a, 5b which fixes the strip | belt-shaped sheet | seat 4 is edge part edge 3a1, 3b1 of the longitudinal direction (Y direction) of the absorptive main body 3 as shown in FIG. 3, FIG. Is applied to the belt-like sheet 4. Therefore, it is possible to reliably prevent the absorbent polymer that constitutes the absorbent body 33 from the end portions 3a and 3b from falling off, and the usability is further improved. Moreover, in the diaper 1, each adhesive agent 5a, 5b is apply | coated to the line which draws a spiral, and also the area | region where the abdominal sheet member 2A or the back | dorsal sheet member 2B and the absorptive main body 3 have overlapped It is only applied to. Therefore, the air permeability is improved and the wearing feeling is further improved. In particular, in the diaper 1, the area of the adhesive 5 b is lower than the area where the adhesive 5 a is applied, and further consideration is given to sweat that is more likely to be worn toward the back area than the ventral area when worn. The wearing feeling is further improved.

  Moreover, in the diaper 1, since the basic weight of the absorptive core by the side of the ventral region A where a wearer's urine tends to concentrate is larger than the basic weight of the absorptive core by the back side region B, urine Can be absorbed sufficiently. And, since the basis weight of the absorbent core on the back side region B side is smaller than the basis weight of the absorbent core on the ventral region A side, even in the adhesive 5b of the back side region B with a small coating amount, The belt-like sheet 4 can be sufficiently fixed, and the absorbent polymer can be prevented from falling off. In particular, since the content of the absorbent polymer in the absorbent body 33 on the back side region B side is smaller than the content of the absorbent polymer in the absorbent body 33 on the ventral region A side, the flexibility of the back side region Has the effect of sex.

  Moreover, in the diaper 1, since the absorbent core has the slit 33d from the back region B side to the ventral region A side, the wearer's urine efficiently spreads over the entire area of the absorbent core. It is easy to absorb urine sufficiently.

The pants-type disposable diaper of the present invention is not limited to the diaper 1 of the present embodiment described above, and can be changed as appropriate.
For example, in the diaper 1 described above, as shown in FIG. 1, a split-type pants-type disposable diaper whose exterior body 2 is composed of a ventral sheet member 2 </ b> A in the ventral region A and a dorsal sheet member 2 </ b> B in the dorsal region B. However, at least the outer layer sheet 21 constituting the exterior body 2 is a pants-type disposable diaper having an integrated outer layer body 2 that is continuous across the ventral region A, the crotch region C, and the back region B. May be.

  3 and 4, the diaper 1 described above absorbs the back side sheet member 2B and the abdominal side sheet member 2A with the adhesive 5b in the back region B and the adhesive 5a in the ventral region A, as shown in FIGS. It is applied only to the region where the adhesive main body 3 overlaps, but at least one of them covers the entire lateral direction (X direction) of the back sheet member 2B or the ventral sheet member 2A, in other words, a belt-like shape It may be applied over the entire X direction of the sheet 4. Thus, if the adhesive agent 5 is apply | coated in the whole region, it can wear smoothly, without the strip | belt-shaped sheet | seat 4 being caught at the time of wear.

  Moreover, as for the diaper 1 mentioned above, as shown in FIG. 5, the absorptive core by the side of the back | dorsal region B which comprises the absorber 33 is compared with the absorptive core by the side of the ventral region A which comprises the absorber 33. Although all items of thickness, basic weight, density, and content of the absorbent polymer are small, at least one item may be small. Further, it may be an absorbent core that does not satisfy any of the items and is uniform over the entire region from the back region B to the ventral region A. Furthermore, in the diaper 1, as shown in FIG. 2, although the absorber 33 has the slit 33d, it does not need to have it.

  The pants-type disposable diaper of the present invention is used as a pants-type disposable diaper for adults, children or infants.

  The following underpants-type disposable diaper is further disclosed regarding the embodiment mentioned above.

<1>
A pants-type disposable diaper comprising an absorbent main body divided into a ventral region, a dorsal region and a crotch region including a vertically long absorbent body, and an exterior body fixed to the non-skin facing surface side of the absorbent main body There,
Both ends in the longitudinal direction of the absorbent main body are covered with the exterior body and a belt-like sheet extending in a lateral direction separate from the exterior body, and the exterior body and the belt-like sheet are interposed via an adhesive. Fixed between
The adhesive in the back side region is a pants-type disposable diaper whose application amount is smaller than the application amount of the adhesive in the abdominal region.

<2>
Each said adhesive agent is the underpants type disposable diaper as described in said <1> currently straddled across the edge part edge of the longitudinal direction of the said absorptive main body.
<3>
The pants-type disposable diaper according to <1> or <2>, wherein the application area of the adhesive in the back region is lower than the application area of the adhesive in the abdominal region.
<4>
The application area of the adhesive in the dorsal region is preferably 2/25 or more, more preferably 2/15 or more of the application area of the adhesive in the ventral region, and the application area of the adhesive in the ventral region. The pants-type disposable diaper according to any one of the above items <1> to <3>, preferably 4/5 or less, more preferably 2/3 or less.
<5>
The application area of the adhesive in the back region is preferably 1 cm ² or more and 60 cm ² or less, more preferably 3 cm ² or more and 40 cm ² or less, and the application area of the adhesive in the ventral region is , preferably at 5 cm ² or more 80 cm ² or less, still more preferably 8 cm ² or more 60cm ² or less, wherein <1> to pants-type disposable diaper according to any one of <4>.
<6>
The application amount of the adhesive in the dorsal region is 2/25 or more and 4/5 or less of the application amount of the adhesive in the ventral region, and the application amount of the adhesive in the dorsal region is 2 g / m ² or more. The pants-type disposable according to any one of <1> to <5>, wherein the amount of the adhesive applied to the ventral region is 10 g / m ² or less and 5 g / m ² or more and 25 g / m ² or less. Diapers.
<7>
The application amount of the adhesive in the dorsal region is preferably 2/25 or more, more preferably 2/15 or more of the application amount of the adhesive in the ventral region, and the application amount of the adhesive in the ventral region. Is preferably 4/5 or less, more preferably 2/3 or less, and the pants-type disposable diaper according to any one of <1> to <6>.
<8>
The application amount of the adhesive in the back region is preferably 2 g / m ² or more and 10 g / m ² or less, more preferably 2 g / m ² or more and 5 g / m ² or less, and the ventral region. The application amount of the adhesive is preferably 5 g / m ² or more and 25 g / m ² or less, more preferably 5 g / m ² or more and 15 g / m ² or less, in the above <1> to <7>. The underpants type disposable diaper of any one.
<9>
<1> to <8> in which the basis weight of the absorbent core constituting the absorbent body on the dorsal region side is lower than the basis weight of the absorbent core constituting the absorbent body on the ventral region side. A pants-type disposable diaper according to any one of the above.
<10>
As for the absorptive core which comprises the said absorber, it is preferable that the basic weight of the back side area | region side is 10% or more and 75% or less of the basic weight of the ventral area side, and is 20% of the basic weight of the ventral area side. The pants-type disposable diaper according to any one of the above items <1> to <9>, more preferably 65% or less.
<11>
The basis weight of the absorbent core constituting the absorber on the back side region side is preferably 50 g / m ² or more and 500 g / m ² or less, and more preferably 75 g / m ² or more and 400 g / m ² or less. Preferably, the basis weight of the absorbent core constituting the absorber on the ventral region side is preferably 150 g / m ² or more and 900 g / m ² or less, and 200 g / m ² or more and 800 g / m ² or less. The pants-type disposable diaper according to any one of the above items <1> to <10>, which is more preferably present.

<12>
Any of <1> to <11>, wherein the content of the absorbent polymer constituting the absorber on the dorsal region side is smaller than the content of the absorbent polymer constituting the absorber on the ventral region side A pants-type disposable diaper according to claim 1.
<13>
The content of the absorbent polymer constituting the absorber on the dorsal region side is preferably 10% or more and 75% or less of the content of the absorbent polymer constituting the absorber on the ventral region side. The pants-type disposable diaper according to any one of <1> to <12>, further preferably 20% to 65% of the content of the absorbent polymer constituting the absorber on the side region side.
<14>
The content of the absorbent polymer constituting the absorber on the back region side is preferably 50 g / m ² or more and 250 g / m ² or less, and more preferably 75 g / m ² or more and 200 g / m ² or less. Preferably, the content of the absorbent polymer constituting the absorber on the ventral region side is preferably 100 g / m ² or more and 500 g / m ² or less, and 150 g / m ² or more and 400 g / m ² or less. The pants-type disposable diaper according to any one of the above items <1> to <13>, which is more preferably present.
<15>
The absorbent core constituting the absorbent body has a thickness on the dorsal region side smaller than a thickness on the ventral region side,
The absorbent core constituting the absorbent body preferably has a thickness on the back region side of 10% or more and 75% or less of the thickness on the ventral region side, and 15% or more and 50% of the thickness on the ventral region side. The pants-type disposable diaper according to any one of the above items <1> to <14>, which is more preferably as follows.
<16>
The thickness of the absorbent core constituting the absorber on the back region side is preferably 0.5 mm to 6 mm, more preferably 1 mm to 5 mm, and the absorber on the ventral region side. The thickness of the absorbent core constituting the pants-type disposable is any one of the above items <1> to <15>, preferably from 1 mm to 9 mm, and more preferably from 2 mm to 7.5 mm. Diapers.
<17>
The absorbent core constituting the absorbent body has a density on the dorsal region side smaller than the density on the ventral region side,
The absorbent core constituting the absorbent body preferably has a density on the dorsal region side of 10% to 75% of the density on the ventral region side, and 20% to 65% of the density on the ventral region side. The pants-type disposable diaper according to any one of the above items <1> to <16>, which is more preferably as follows.
<18>
The density of the absorbent core constituting the absorber on the back region side is preferably 0.01 g / cm ³ or more and 0.75 g / cm ³ or less, preferably 0.03 g / cm ³ or more and 0.55 g / cm. ³ or less, and the density of the absorbent core constituting the absorber on the ventral region side is preferably 0.1 g / cm ³ or more and 1 g / cm ³ or less, preferably 0.15 g The pants-type disposable diaper according to any one of the above <1> to <17>, more preferably / cm ³ or more and 0.8 g / cm ³ or less.
<19>
The width of the belt-like sheet (the length in the Y direction) is preferably 10% or more and 60% or less, and preferably 15% or more and 50% or less with respect to the length in the width direction (Y direction) of the exterior body. The pants-type disposable diaper according to any one of <1> to <18>, which is more preferably present.
<20>
Any of <1> to <19>, wherein the thickness of each application line that draws the spiral of the adhesive in the dorsal region is thinner than the thickness of the application line that draws the spiral of the adhesive in the ventral region A pants-type disposable diaper according to claim 1.
<21>
Any one of the above <1> to <20>, wherein the number of application lines that draw the spiral of the adhesive in the back region is smaller than the number of application lines that draw the spiral of the adhesive in the ventral region The pants-type disposable diaper described in 1.
<22>
The pants-type disposable diaper according to any one of <1> to <21>, wherein the absorbent body has a slit extending from the dorsal region to the ventral region.

DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 2 Exterior body 2A Abdominal sheet member 2B Back sheet member 21 Outer layer sheet 22 Inner layer sheet 23 Elastic member 3 Absorbent body 3a, 3b End part 3a1, 3b1 End edge 31 Top sheet 32 Back sheet 33 Absorbent body 34 Side cuff 35 Side cuff elastic member 4 Strip sheet 5, 5a, 5b Adhesive A Abdominal side area B Back side area C Inseam area CL Center line extending in the vertical direction

Claims (7)

A pants-type disposable diaper comprising an absorbent main body divided into a ventral region, a dorsal region and a crotch region including a vertically long absorbent body, and an exterior body fixed to the non-skin facing surface side of the absorbent main body There,
Both ends in the longitudinal direction of the absorbent main body are covered with the exterior body and a belt-like sheet extending in a lateral direction separate from the exterior body, and the exterior body and the belt-like sheet are interposed via an adhesive. Fixed between
The adhesive in the back side region is a pants-type disposable diaper whose application amount is smaller than the application amount of the adhesive in the abdominal region.   2. The pants-type disposable diaper according to claim 1, wherein each of the adhesives is applied so as to straddle a longitudinal end edge of the absorbent main body.   The pants-type disposable diaper according to claim 1 or 2, wherein the adhesive in the back region has a lower application area than the application area of the adhesive in the abdominal region. The application amount of the adhesive in the dorsal region is 2/25 or more and 4/5 or less of the application amount of the adhesive in the ventral region, and the application amount of the adhesive in the dorsal region is 2 g / m ² or more. a is 10 g / ^{m 2} or less, pants-type disposable diaper according to any one of claims 1 to 3 applied amount of the adhesive of the ventral region is 5 g / ^{m 2} or more 25 g / ^{m 2} or less.   The absorptive core which comprises the said absorber of the back | dorsal area | region side has the basis weight which is low compared with the basic weight of the absorptive core which comprises the said absorber of the ventral | abdominal area | region side. The pants-type disposable diaper according to item 1.   The absorbent body on the dorsal region side has a smaller content of the absorbent polymer than the content of the absorbent polymer on the ventral region side. The pants-type disposable diaper according to Item. The pants-type disposable diaper according to any one of claims 1 to 6, wherein the absorbent body has a slit extending from the dorsal region to the ventral region.

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