JP6708723B2 - Pants-type disposable diaper - Google Patents

Description

The present invention relates to a pants-type disposable diaper.

Conventionally, a pair of side seals, a waist opening and a pair of side seals are formed by joining both sides of an abdominal region disposed on the abdomen of a wearer when worn and both sides of a dorsal region disposed on the back side. A pants-type disposable diaper having a leg opening is known. A force in the width direction is applied to the side seal portion when the diaper of this kind is expanded or when the diaper is worn. In addition, when pulling up the diaper when wearing the diaper, a longitudinal force is applied to the side seal portion. Since various forces are applied to the side seal portion in this manner, it is necessary to set the seal strength high. However, on the other hand, when the diaper is taken off, the side seal part is torn and separated into the ventral side region and the back side region. From this viewpoint, it is not desirable that the side seal part has too high sealing strength. As described above, the side seal portion is required to have both tear resistance during wearing or during wearing and ease of tearing during undressing after use.

For this purpose, Patent Document 1 discloses a pants-type disposable diaper in which the joint strength of a side seal portion formed by joining both sides of a front body and both sides of a back body is partially adjusted. ing.

As a technique different from this, Patent Document 2 discloses that a papermaking sheet containing a natural fiber such as pulp is used as a constituent member of disposable clothing. Further, Patent Document 3 discloses a disposable diaper in which a sweat-absorbent sheet containing hydrophilic fibers is attached to the waistline region.

JP 2002-291801 A International Publication No. 2016/093371 Pamphlet JP, 2007-301346, A

In the technique described in Patent Document 1, it is not possible to achieve both tear resistance during or during wearing and ease of tearing during undressing after use.

Further, in Patent Document 2, no consideration is given to the side seal portion. Further, the sweat-absorbent sheet described in Patent Document 3 does not extend over both side portions of the exterior body, and no consideration is given to the side seal portion.

Therefore, an object of the present invention is to achieve both tear resistance at the time of wearing or during wearing and easy tearing at the time of undressing after use.

The present invention is an absorbent article comprising an absorbent main body and an exterior body arranged on the non-skin facing surface side thereof, having an longitudinal direction corresponding to the front-back direction of the wearer,
A pair of side seals which are joined so that the skin facing surfaces at both side edges of the ventral side region of the exterior body and the skin facing surfaces at both side edges of the back side region of the exterior body are in contact with each other and extend in the longitudinal direction. Part is formed,
Of the ventral region and the dorsal region of the exterior body, at least the region adjacent to the side seal portion has elasticity in the lateral direction,
Of the side edges of each of the ventral region and the dorsal region, the portion forming the side seal portion contains a cellulosic fiber and a thermoplastic fiber,
It is intended to provide a pants-type disposable diaper in which the cellulosic fibers are oriented in a direction intersecting the longitudinal direction in the side seal portion.

According to the present invention, there is provided a pants-type disposable diaper that has both tear resistance during or during wearing and easy tearing during undressing after use.

FIG. 1 is a perspective view schematically showing an embodiment of a pants-type disposable diaper of the present invention. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a cross-sectional view of a side seal portion of a pants-type disposable diaper, which is another embodiment of the present invention, taken along the lateral direction. FIG. 4 is a cross-sectional view of a side seal portion of a pants-type disposable diaper, which is another embodiment of the present invention, taken along the lateral direction. FIG. 5 is a cross-sectional view taken along the lateral direction of a side seal portion of a pants-type disposable diaper according to yet another embodiment of the present invention.

Hereinafter, the pants-type disposable diaper of the present invention will be described based on its preferred embodiments. The pants-type disposable diaper 1 of the embodiment shown in FIG. 1 includes an abdominal region 1A arranged on the abdominal side of the wearer when worn and a dorsal region 1B arranged on the back side. The diaper 1 has an absorbent main body 5 and an exterior body 6 disposed on the non-skin-facing surface side of the absorbent main body 5.

In the present specification, the “skin-facing surface” is a surface of the disposable diaper or its constituent members (for example, an exterior body) that is directed to the wearer's skin side when wearing the wearable article, that is, relatively close to the wearer's skin. The side surface, the "non-skin facing surface", in the disposable diaper or its constituent members, the surface facing away from the skin side when wearing the wearing article, that is, the side relatively far from the wearer's skin. Is a face.

As shown in FIG. 1, the outer casing 6 has an abdominal region 1A, a dorsal region 1B, and a crotch region 1C located between them. The crotch region 1C is a part that is arranged in the crotch part of the wearer when worn. Further, the diaper 1 has a vertical direction X extending from the abdominal region 1A to the dorsal region 1B via the crotch region 1C and a lateral direction Y orthogonal thereto. The exterior body 6 has a shape in which both side edges along the vertical direction X are constricted inward in the crotch region 1C.

As shown in FIG. 2, the exterior body 6 includes an inner layer sheet 62 which is a skin side layer closer to the wearer's skin side, and a non-skin side positioned farther from the wearer's skin than the inner layer sheet 62. It has the outer layer sheet 61 used as a layer. The inner layer sheet 62 and the outer layer sheet 61 are joined together to form an integral type composite sheet. The inner layer sheet 62 and the outer layer sheet 61 are each formed of a nonwoven fabric containing cellulosic fibers and thermoplastic fibers. In the abdominal region 1A and the dorsal region 1B, the outer layer sheet 61 extends outward in the vertical direction X from the end of the inner layer sheet 62 in the vertical direction X, and the extended portion is folded back to the inner layer sheet 62 side. May be. A plurality of elastic members 63 are arranged and fixed between the outer layer sheet 61 and the inner layer sheet 62 in each of the abdominal region 1A and the back region 1B. The elastic member 63 is arranged along the lateral direction Y in the expanded state, and the elastic member 63 in the expanded state reaches the vicinity of the side seal portion 8 described later. Therefore, of the ventral side region 1A and the back side region 1B of the exterior body 6, at least the region adjacent to the side seal portion 8 has elasticity in the lateral direction Y.

The diaper 1 is joined so that the skin-facing surfaces on both side edges of the ventral region 1A of the exterior body 6 and the skin-facing surfaces on both side edges of the back region 1B of the exterior body 6 are in contact with each other. Thus, the pair of side seal portions 8 and 8, the waist opening portion 1W and the pair of leg opening portions 1L and 1L are formed. As a joining means for forming the side seal portion 8, a heating means and/or a pressing means can be used. The side seal portion 8 formed in this way has a so-called gassho structure.

Of the side edges of the abdominal region 1A in the lateral direction Y and the lateral edges of the dorsal region 1B in the lateral direction Y, the portion forming the side seal portion 8 contains cellulosic fibers and thermoplastic fibers. The cellulosic fibers contained in the side seal portion 8 are preferably oriented in a direction intersecting the longitudinal direction X in which the side seal portion 8 extends, and are oriented in a lateral direction Y orthogonal to the longitudinal direction X. More preferable. In order to orient the cellulosic fibers in the intersecting direction, a pants-type disposable diaper is manufactured by a so-called cross-flow manufacturing method.

Conventionally, in the side seal part of a pants-type disposable diaper, the fiber forming the side seal part is formed only of thermoplastic fibers, and the peel strength of the side seal part before absorbing body fluid and after absorbing body fluid. Since the peel strength of the side seal portion is the same, it is possible to achieve both tear resistance of the side seal portion during or during wearing and ease of tearing of the side seal portion during undressing after use. could not. On the other hand, according to the diaper 1 of the present embodiment, the portion forming the side seal portion 8 contains the cellulosic fiber. Moreover, since the side seal portion 8 has a gas palm structure, it is possible to directly absorb, for example, body fluid, sweat while the diaper 1 is worn, by the side seal portion 8, and the side seal portion 8 is separated before absorbing the body fluid. The peel strength of the side seal portion 8 after absorbing body fluid is lower than the strength. Due to this, when the diaper is taken off after use, the side seal portion 8 is easily torn. Furthermore, since the cellulosic fibers are oriented in a direction intersecting the longitudinal direction X in which the side seal portion 8 extends, when the diaper is expanded or when the abdominal circumference changes during wearing of the diaper, the side seal portion 8 is moved in the lateral direction Y. Even if the force is applied, the side seal portion 8 is unlikely to tear. As described above, according to the diaper 1 of the present embodiment, the peel strength of the side seal portion 8 changes before and after absorbing body fluid, so that the side seal portion 8 can prevent tearing during or during wearing, and can be easily torn during undressing after use. It can be compatible with the sex.

The above-mentioned "oriented in a direction intersecting the longitudinal direction X in which the side seal portion 8 extends" means that when an arbitrary portion of the side seal portion 8 in plan view is observed, the side seal portion 8 extends in the longitudinal direction. The angle formed by the imaginary straight line extending parallel to X and the orientation direction of the cellulosic fibers is preferably 45° or more and 135° or less, and more preferably 90°. The orientation direction of the cellulosic fibers of the side seal portion 8 can be determined according to the following method.

<Measurement of Cellulose Fiber Orientation Direction of Side Seal Part 8>
A red solution is prepared by dissolving 1 g of Red No. 1 in 200 g of pure water. After impregnating the entire diaper outer package with this red solution for 5 minutes, the diaper outer package is dried by electrodrying at 70° C. for 24 hours. As a result, a diaper exterior body in which only cellulosic fibers are dyed red is created. After maximally stretching the colored exterior body, a plane enlarged image of the side seal portion 8 is photographed with a microscope VHX1000 manufactured by KEYENCE at a magnification of 20 times. The photographed image is printed, and the image is binarized using the image processing software NewQube (trade name) of Nexus Co., Ltd. Then, using a fiber orientation analysis program, Fiber Orientation Analysis 8.13 Single (software name), the orientation angle between the virtual straight line extending along the side seal portion and the cellulosic fiber is measured from the binarized image. .. The measurement is performed at five points, and the average thereof is taken as the angle formed by the imaginary straight line extending in the longitudinal direction X along the side seal portion 8 of the diaper exterior body and the orientation direction of the cellulosic fibers.

As described above, in the present embodiment shown in FIG. 2, the inner layer sheet 62 is used as the skin side sheet closer to the wearer's skin side, and is located farther from the wearer's skin than the skin side sheet. The outer layer sheet 61 is used as the non-skin side sheet. Therefore, the side edge of the abdominal region 1A and the side edge of the dorsal region 1B are each formed by stacking two independent sheet structures. Regarding the content rate of the cellulosic fibers in this sheet structure, when the outer layer sheet 61 is higher than the inner layer sheet 62, the outer layer sheet 61 is the inner layer because the cellulosic fibers absorb body fluid during use of the diaper 1. It becomes easier to tear than the seat 62, and as a result, the side seal portion 8 becomes easier to tear.

In the side seal portion 8, the side portion of the ventral side region A and the side portion of the back side region 1B may be continuously joined along the vertical direction X of the side seal portion 8, and the vertical direction X thereof. It may be joined intermittently along. From the viewpoint of easiness of tearing of the side seal portion 8 at the time of undressing after use, it is preferable that the side seal portion 8 is intermittently joined and formed. From the viewpoint of making this effect more remarkable, the distance between the joint portions adjacent to each other in the vertical direction X in the side seal portion 8 is preferably 0.2 mm or more, more preferably 0.4 mm or more, and preferably It is 4 mm or less, more preferably 3 mm or less.

In the embodiment shown in FIG. 2, the side edge of the abdominal region 1A and the side edge of the dorsal region 1B are respectively formed from two sheets, an inner layer sheet 62 closer to the skin side and an outer layer sheet 61 far from the skin. Become. It is preferable that the inner layer sheet 62 and the outer layer sheet 61 have different ratios of thermoplastic fibers contained therein. Specifically, the content of the thermoplastic fiber in the side seal portion 8 is preferably higher in the inner layer sheet 62 than in the outer layer sheet 61. By doing so, the side seal portion 8 is less likely to be torn during wearing or during wearing, and the side seal portion 8 is likely to be torn during undressing after use. From the viewpoint of making this effect more remarkable, the ratio ((T1/T2)×100) of the content T1 of the thermoplastic fibers of the outer layer sheet 61 to the content T2 of the thermoplastic fibers of the inner layer sheet 62 is 90%. It is particularly preferably 80% or less, and most preferably 0%.

In the embodiment shown in FIG. 2, the preferable range of the content rates T1 and T2 itself is 60 mass% or less, more preferably 50 mass% or less, and most preferably 0 mass% for the content rate T1. The content T2 is 20% by mass or more, further 30% by mass or more, and most preferably 100% by mass. The content of the thermoplastic fiber in the side seal portion 8 can be measured according to the following method.

<Measurement Method of Thermoplastic Fiber Content in Side Seal Part>
The inner layer sheet 62 and the outer layer sheet 61 of the outer package are impregnated with a red solution prepared by dissolving 1 g of Red No. 1 in 200 g of pure water for 5 minutes. Then, the inner layer sheet 62 and the outer layer sheet 61 are dried by electrodrying at 70° C. for 24 hours. As a result, a sheet in which only the cellulosic fibers are dyed red is prepared. A plane enlarged image of this colored sheet is photographed with a microscope VHX1000 manufactured by KEYENCE at a magnification of 200 times. It is transferred onto an OHP film of red colored fibers, and the area thereof is measured by image analysis using Image-Pro plus 6.2 Installation manufactured by Roper Co., Ltd. Similarly, non-red fibers were copied on OHP and the area was measured in the same manner. With respect to the total area of the red and white fibers, the total area of the white fibers is taken as the content rate of the thermoplastic fiber, and the content rate is obtained for each of the inner layer sheet and the outer layer sheet. The measurement is performed at each of 5 points, and the average value is taken as the content rate.

In the embodiment shown in FIG. 2, it is also preferable that the inner layer sheet 62 and the outer layer sheet 61 have different proportions of cellulosic fibers contained therein, similarly to the thermoplastic fibers described above. Specifically, the content of the cellulosic fibers in the side seal portion 8 is preferably higher in the outer layer sheet 61 than in the inner layer sheet 62. By doing so, it becomes easier to achieve both the tear resistance of the side seal portion 8 during or during wearing and the ease of tearing of the side seal portion 8 during undressing after use. From the viewpoint of making this effect more remarkable, the ratio ((S2/S1)×100) of the cellulosic fiber content S2 in the inner layer sheet 62 to the cellulosic fiber content S1 in the outer layer sheet 61 is preferably It is 90% or less, more preferably 80% or less, and most preferably 0%.

In the embodiment shown in FIG. 2, the preferable range of the content rates S1 and S2 itself is 35 mass% or more, further 45 mass% or more, and 100 mass% is most preferable for the content rate S1. The content S2 is 60% by mass or less, further 50% by mass or less, and 0% by mass is most preferable. The content rate of the cellulosic fibers in the side seal portion 8 can be measured according to the following method.

<Method of measuring content rate of cellulosic fiber in side seal part>
The inner layer sheet 62 and the outer layer sheet 61 of the outer package are impregnated with a red solution prepared by dissolving 1 g of Red No. 1 in 200 g of pure water for 5 minutes. Then, the inner layer sheet 62 and the outer layer sheet 61 are dried by electrodrying at 70° C. for 24 hours. As a result, a sheet in which only the cellulosic fibers are dyed red is prepared. A plane enlarged image of this colored sheet is photographed with a microscope VHX1000 manufactured by KEYENCE at a magnification of 200 times. It is transferred onto an OHP film of red colored fibers, and the area thereof is measured by image analysis using Image-Pro plus 6.2 Installation manufactured by Roper Co., Ltd. Similarly, the non-red fibers are copied on the OHP and the area is measured in the same manner. The total content of red and white fibers is defined as the total content of red fiber areas, and the content of cellulose is determined for each of the inner layer sheet and the outer layer sheet. The measurement is performed at each of 5 points, and the average value is taken as the content rate.

In the side seal portion 8, the central portion 8C in the vertical direction X of the side seal portion 8, the end portion 8W on the waist opening 1W side, and the end portion 8L on the leg opening 1L side contain the cellulose fiber. It is preferred that the proportions are different. In particular, the content rate of the cellulosic fibers may be lower in the end portion 8W on the waist opening 1W side and the end portion 8L on the leg opening 1L side than in the central portion 8C in the vertical direction X of the side seal portion 8. preferable. This effectively prevents the end portions 8W and 8L from tearing unintentionally at the end portions 8W and 8L which are the starting points for tearing the side seal portion 8. At the same time, when the side seal portion 8 starts to be torn, the tear can be performed smoothly. From the viewpoint of making this effect more remarkable, the ratio ((S3/S5)×100) of the cellulosic fiber content S3 in the end portion 8W to the cellulosic fiber content rate S5 in the central portion 8C is set to 90%. It is particularly preferably 80% or less, and most preferably 0%. As described above, it is most preferable that the end portion 8W has no cellulosic fibers and only the thermoplastic fibers. The ratio of the cellulosic fibers in the end portion 8L may be the same as or different from the ratio ((S3/S5)×100) in the end portion 8W.

The preferred range of the content rates S3 and S5 itself is 60 mass% or less, more preferably 50 mass% or less, and most preferably 0 mass% for the content rate S3. The content S5 is 20% by mass or more, further 25% by mass or more, and 80% by mass or less, further 70% by mass or less. The content of the cellulosic fibers in each part of the side seal part 8 can be measured according to the following method.

<Method of measuring content rate of cellulosic fiber at each site in side seal part>
The entire exterior body of the side seal part is impregnated with a red solution prepared by dissolving 1 g of Red No. 1 in 200 g of pure water for 5 minutes. After that, the inner layer sheet 62 and the outer layer sheet 61 are each cut by 10 mm×10 mm at the waist opening end. Similarly, the inner layer sheet 62 and the outer layer sheet 61 are each cut by 10 mm×10 mm at the leg opening end. Further, the inner layer sheet 62 and the outer layer sheet 61 are each cut by 10 mm×10 mm at the central portion 8C in the longitudinal direction X in which the side seal portion 8 extends. Similar to the above-mentioned <Method of measuring content of cellulose fiber in side seal part>, the content of cellulose in each portion of the cut sample is calculated, and the difference in content is measured. Five points are measured for each sample, and the average value is used as the content rate.

Next, another embodiment of the present invention will be described with reference to FIGS. Regarding the embodiment shown in FIG. 3 to FIG. 5, constituent parts different from the above-described embodiment will be mainly described, and similar constituent parts will be denoted by the same reference numerals and description thereof will be omitted. The description of the above-described embodiment is appropriately applied to components that are not particularly described.

The outer body 6 in the diaper 1 of the embodiment shown in FIG. 3 has an inner layer close to the wearer's skin side at the lateral edge of the abdominal region 1A in the lateral direction Y and the lateral edge of the dorsal region 1B in the lateral direction Y. A sheet 62 and an outer layer sheet 61 far from the skin are provided, and in addition to them, a cellulose-containing layer 70 containing a cellulosic fiber is further provided between the outer layer sheet 61 and the inner layer sheet 62. Examples of such a cellulose-containing layer include the sweat absorbing sheet described in JP 2010-119578 A. The cellulose-containing layer 70 is arranged so as to extend in the lateral direction Y between the pair of side seal portions 8 and 8 and extends to a position overlapping the side seal portions 8 and 8. In the embodiment shown in FIG. 3, the side edge of the abdominal region 1A and the side edge of the dorsal region 1B are a laminate of the inner layer sheet 62, the cellulose-containing layer 70, and the outer layer sheet 61, respectively. The skin-facing surface of the inner layer sheet 62 at the side edge of the side area 1A and the skin-facing surface of the inner layer sheet 62 at the side edge of the back area 1B are joined so as to come into contact with each other, whereby the side seal portion 8 is formed. Has been formed.

In the embodiment shown in FIG. 3, each of the inner layer sheet 62 and the outer layer sheet 61 is made of a nonwoven fabric that does not contain cellulosic fibers and is composed of only thermoplastic fibers. That is, the content T1 of the thermoplastic fibers of the outer layer sheet 61 and the content T2 of the thermoplastic fibers of the inner layer sheet 62 are each 100% by mass. Further, the cellulose-containing layer 70 is made of a non-woven fabric composed of only cellulosic fibers without containing thermoplastic fibers. That is, the content rate of the cellulosic fibers in the cellulosic layer 70 is 100% by mass.

In the embodiment shown in FIG. 3, in the side seal portion 8, the cellulosic fibers of the cellulose-containing layer 70 are oriented in the direction intersecting the longitudinal direction X. The diaper 1 shown in FIG. 3 also has both tear resistance during wearing or during wearing and ease of tearing during undressing after use.

The outer body 6 in the diaper 1 of the embodiment shown in FIG. 4 has an inner layer close to the wearer's skin side in the lateral edge of the abdominal region 1A in the lateral direction Y and the lateral edge of the dorsal region 1B in the lateral direction Y. It has a sheet 62 and an outer layer sheet 61 farther from the skin, and in addition to them, further has an outermost layer sheet 68 farther from the wearer's skin than the outer layer sheet 61. The inner layer sheet 62, the outer layer sheet 61, and the outermost layer sheet 68 are joined together to form an integral type composite sheet. The inner layer sheet 62, the outer layer sheet 61, and the outermost layer sheet 68 are each formed of a nonwoven fabric containing cellulosic fibers and thermoplastic fibers. The elastic member 63 is disposed and fixed between the outer layer sheet 61 and the inner layer sheet 62, or between the outer layer sheet 61 and the outermost layer sheet 68. In the embodiment shown in FIG. 4, the skin facing surface of the inner layer sheet 62 at the side edge portion of the abdominal region 1A and the skin facing surface of the inner layer sheet 62 at the side edge portion of the back side region 1B are joined so as to abut. Thus, the side seal portion 8 is formed.

In the embodiment shown in FIG. 4, the inner layer sheet 62, the outer layer sheet 61, and the outermost layer sheet 68 preferably have different thermoplastic fiber or cellulosic fiber ratios contained therein. Specifically, the content of the cellulosic fibers is preferably higher in the outer layer sheet 61 than in the inner layer sheet 62, and the content of the thermoplastic fibers is preferably higher in the outermost layer sheet 68 than in the outer layer sheet 61. .. By doing so, the peel strength of the side seal part 8 can be improved, and the side seal part 8 can be prevented from breaking during or during wearing. From the viewpoint of making this effect more remarkable, the ratio ((T1/T3)×100) of the content T1 of the thermoplastic fiber of the outer layer sheet 61 to the content T3 of the thermoplastic fiber of the outermost layer sheet 68 is set to 90. % Or less, more preferably 80% or less, and most preferably 0%. As described above, it is most preferable that the outermost layer sheet 68 does not contain cellulosic fibers and is composed of only thermoplastic fibers.

The preferable range of the content rates T1 and T3 itself is the same as the above-mentioned range with respect to the content rate T1. The content T3 is 30% by mass or more, further 40% by mass or more, and most preferably 100% by mass. The content of the thermoplastic fiber in the side seal portion 8 can be measured according to the method described above.

The exterior body 6 in the diaper 1 of the embodiment shown in FIG. 5 has one sheet 69 at each of the lateral edge portion of the abdominal region 1A in the lateral direction Y and the lateral edge portion of the dorsal region 1B in the lateral direction Y. is doing. The sheet 69 is made of a non-woven fabric in which cellulosic fibers and thermoplastic fibers are mixed. The elastic member 63 is disposed and fixed on the non-skin-facing surface of the sheet 69. The diaper 1 shown in FIG. 5 can also achieve both tear resistance during or during wearing and ease of tearing during undressing after use.

Examples of the cellulosic fibers constituting the side seal portion 8 used in the above-described embodiments include natural cellulosic fibers such as cotton and pulp; regenerated cellulosic fibers such as rayon and cupra. These can be used alone or in combination of two or more. The cellulosic fibers may be short fibers or long fibers. From the viewpoint of easiness of tearing of the side seal portion 8 during undressing after use, short fibers of natural cellulosic fibers are preferable. In particular, if cotton is used as the cellulosic fiber, it is possible to prevent the side seal portion 8 from being easily torn in the lateral direction Y and to prevent accidental tearing. If pulp is used as the cellulosic fiber, the side seal portion 8 can be torn with a uniform force when undressing after use.

As the thermoplastic fibers forming the side seal portion 8, fibers made of various thermoplastic resins can be used. Examples of the thermoplastic resin include polyolefin such as polyethylene and polypropylene; polyester such as polyethylene terephthalate; polyamide such as nylon 6 and nylon 66; polyacrylic acid, polymethacrylic acid alkyl ester, polyvinyl chloride, polyvinylidene chloride, and the like. These 1 type can be used individually or in combination of 2 or more types. The thermoplastic fibers may be short fibers or long fibers. As the thermoplastic fiber, core-sheath type or side-by-side type composite fiber, split fiber, modified cross-section fiber, heat-shrinkable fiber and the like can also be used.

The pants-type disposable diaper of the present invention is not limited to the above-described embodiments, and can be appropriately modified. Further, the respective constituents in the above-described respective embodiments can be appropriately combined and implemented within a range not impairing the gist of the present invention.

For example, in the embodiment shown in FIGS. 1 and 2, the embodiment shown in FIG. 4, and the embodiment shown in FIG. 5, the backside region 1B of the outer package 6 has a cellulose-containing layer containing a cellulosic fiber. May be. Examples of such a cellulose-containing layer include the sweat absorbing sheet described in JP 2010-119578 A. It is preferable that such a cellulose-containing layer is arranged so as to extend in the lateral direction Y between the pair of side seal portions 8 and 8 and extends to a position overlapping the side seal portions 8 and 8. When the cellulose-containing layer is arranged in this way, the sweat of the wearer who is wearing is absorbed, and the absorbed sweat reaches the side seal portion 8 along the cellulose-based fibers of the cellulose-containing layer, thereby allowing the use. The side seal portion 8 is easily torn during subsequent undressing.

Further, in the side seal portion 8, a first portion containing cellulosic fibers and a second portion containing no cellulosic fibers may be formed in the longitudinal direction X in which the side seal portions 8 extend. For example, in the region where the inner layer sheet 62 and the outer layer sheet 61 overlap with each other, by providing the inner layer sheet 62 and the outer layer sheet 61 with a portion containing cellulosic fibers and a portion not containing the cellulosic fibers, the vertical length of the side seal portion 8 is increased. In the direction X, the first portion and the second portion can be formed. From the viewpoint of improving the peel strength of the side seal portion 8, it is preferable that the seal joint area of the first portion of the side seal portion 8 be larger than the seal joint area of the second portion. Here, the seal joint area means the area surrounded by the contour of the joint portion in which the side edge portion of the abdominal region 1A and the side edge portion of the back side region 1B are joined by the heating means and/or the pressurizing means. Means area.

The seal joint area A1 of the first portion of the side seal portion 8 is preferably 0.3 mm ² /10 mm or more, more preferably 0.8 mm ² /10 mm or more, and preferably 120 mm ² /10 mm or less, more preferably Is 100 mm ² /10 mm or less. The seal joint area A2 of the second portion of the side seal portion 8 is preferably 0.1 mm ² /10 mm or more, more preferably 0.5 mm ² /10 mm or more, and preferably 100 mm ² /10 mm or less, more preferably Is 70 mm ² /10 mm or less. The ratio ((A1/A2)×100) of the seal joint area A1 to the seal joint area A2 is preferably 110% or more, and particularly preferably 130% or more. The seal joint area A1 of the first portion and the seal joint area A2 of the second portion of the side seal portion 8 can be measured according to the following method.

<Measurement method of the seal joining areas A1 and A2 of the first portion and the second portion in the side seal portion>
After maximally extending the exterior body, a plane enlarged image of the first portion of the side seal portion 8 is photographed with a microscope VHX1000 manufactured by KEYENCE at a magnification of 200 times. The seal portion of the photographed image is copied on an OHP film, and the area is measured by image analysis using Image-Pro plus 6.2 Installation manufactured by Roper Co., Ltd. Further, the area of the joint portion of the first portion per 10 mm in the longitudinal direction X of the side seal portion 8 is defined as the seal joint area A1. The seal joining area A1 does not mean the total area of the pair of side seal portions 8 and 8, but means the average value of the pair of side seal portions 8 and 8. Similarly, the area of the joint portion of the second portion per length 10 mm in the vertical direction X of the side seal portion 8 is defined as the seal joint area A2. The seal joining area A2 means an average value of the pair of side seal portions 8 and 8.

In addition, in the embodiment shown in FIGS. 1 and 2, the inner layer sheet 62 is used as the skin side layer and the outer layer sheet 61 is used as the non-skin side layer. In the embodiment shown in FIG. The outermost layer sheet 68 is used as a sheet. The skin side layer, the non-skin side layer, and the second non-skin side layer are in the form of sheets such as non-woven fabric, woven fabric, and knitted fabric. It may be in the form of a constituent fibrous web layer.

Moreover, in the embodiment shown in FIG. 1, the diaper 1 having the exterior body 6 extending over the abdominal region 1A, the crotch region 1C and the back region 1B has been described. And a ventral side sheet member disposed on the ventral side, and the dorsal side sheet member and the ventral side sheet member are joined by a pair of side seal portions to form a tubular shape. At the same time, the absorbent main body may be a pants-type disposable diaper of an exterior body split type in which the absorbent main body is laid across and fixed between the back sheet member and the abdominal sheet member.

Regarding the above-described embodiment of the present invention, the following pants-type disposable diaper is further disclosed.
<1>
An absorbent article comprising an absorbent main body and an exterior body arranged on the non-skin facing surface side thereof, which has a longitudinal direction corresponding to the front-back direction of the wearer,
A pair of side seals which are joined so that the skin facing surfaces at both side edges of the ventral side region of the exterior body and the skin facing surfaces at both side edges of the back side region of the exterior body are in contact with each other and extend in the longitudinal direction. Part is formed,
Of the ventral region and the dorsal region of the exterior body, at least the region adjacent to the side seal portion has elasticity in the lateral direction,
Of the side edges of each of the ventral region and the dorsal region, the portion forming the side seal portion contains a cellulosic fiber and a thermoplastic fiber,
A pants-type disposable diaper in which the cellulosic fibers are oriented in a direction intersecting the longitudinal direction in the side seal portion.

<2>
The side edges of each of the ventral side region and the back side region are a skin side layer closer to the wearer's skin side, and a non-skin side positioned farther from the wearer's skin than the skin side layer. With layers,
The pants-type disposable diaper according to <1>, wherein the content of the thermoplastic fiber is higher in the skin side layer than in the non-skin side layer.
<3>
The pants-type disposable diaper according to <1> or <2>, wherein the back side region of the exterior body has a cellulose-containing layer containing the cellulose fibers.
<4>
The pants-type disposable diaper according to any one of <1> to <3>, wherein the cellulosic fibers are short fibers.

<5>
The side edges of each of the ventral side region and the back side region are a skin side layer closer to the wearer's skin side, and a non-skin side positioned farther from the wearer's skin than the skin side layer. A layer and a second non-skin side layer located on the side farther from the wearer's skin than the non-skin side layer,
The content of the cellulosic fibers is higher in the non-skin side layer than in the skin side layer,
The pants-type disposable diaper according to any one of <1> to <4>, in which the content of the thermoplastic fiber is higher in the second non-skin side layer than in the non-skin side layer.
<6>
The content rate of the cellulosic fibers in the side seal part is higher than the longitudinal center part of the side seal part, and the waist opening side end of the pants-type disposable diaper and the leg opening of the pants-type disposable diaper. The pants-type disposable diaper according to any one of <1> to <5>, in which the end on the side of the part is lower.
<7>
The side edges of each of the ventral side region and the back side region are a skin side layer closer to the wearer's skin side, and a non-skin side positioned farther from the wearer's skin than the skin side layer. With layers,
The pants-type disposable diaper according to any one of <1> to <6>, wherein the content rate of the cellulosic fibers in the non-skin side layer is 35% by mass or more.
<8>
In the side seal part, the side edge part of the ventral side region and the side edge part of the back side region are intermittently joined along the longitudinal direction of the side seal part, <1> to The pants-type disposable diaper according to any one of <7>.
<9>
The pants-type disposable diaper according to any one of <1> to <8>, wherein the cellulosic fiber is a cotton fiber.
<10>
The pants-type disposable diaper according to any one of <1> to <8>, wherein the cellulosic fibers are pulp fibers.

<11>
In the longitudinal direction of the side seal portion, having a first portion containing the cellulosic fibers and a second portion not containing the cellulosic fibers,
The pants type according to any one of <1> to <10>, wherein a seal joint area of the first portion of the side seal portion is larger than a seal joint area of the second portion of the side seal portion. Disposable diaper.
<12>
The seal joint area A1 of the first portion is preferably 0.3 mm ² /10 mm or more, more preferably 0.8 mm ² /10 mm or more, and preferably 120 mm ² /10 mm or less, per 10 mm of the side seal longitudinal direction. More preferably, the pants-type disposable diaper according to <11>, having a size of 100 mm ² /10 mm or less.
<13>
The seal joining area A2 of the second portion is preferably 0.1 mm ² /10 mm or more, more preferably 0.5 mm ² /10 mm or more, and preferably 100 mm ² /10 mm or less, per 10 mm of the side seal longitudinal direction. More preferably, the pants-type disposable diaper according to <11> or <12> is 70 mm ² /10 mm or less.
<14>
The ratio ((A1/A2)×100) of the seal bonding area A1 to the seal bonding area A2 is preferably 110% or more, particularly preferably 130% or more, any of the above <11> to <13> The pants-type disposable diaper described in 1.

<15>
The distance between the joint portions extending in the longitudinal direction and extending in the side seal portion is preferably 0.2 mm or more, more preferably 0.4 mm or more, and preferably 4 mm or less, more preferably 3 mm or less, The pants-type disposable diaper according to any one of <1> to <14>.
<16>
A skin side layer closer to the wearer's skin side, and a non-skin side layer located on the side farther from the wearer's skin than the skin side layer,
90% of the ratio ((T1/T2)×100) of the content T1 of the thermoplastic fibers of the outer layer sheet to be the non-skin side layer to the content T2 of the thermoplastic fibers of the inner layer sheet to be the skin side layer, The pants-type disposable diaper described in any one of the above items <1> to <15> is preferably set to the following, more preferably set to 80% or less, and most preferably set to 0%.
<17>
A skin side layer closer to the wearer's skin side, and a non-skin side layer located on the side farther from the wearer's skin than the skin side layer,
The preferable range of the content T1 of the thermoplastic fibers of the outer layer sheet which is the non-skin side layer is 60% by mass or less, more preferably 50% by mass or less, and most preferably 0% by mass. The pants-type disposable diaper according to any one of <16>.
<18>
A skin side layer closer to the wearer's skin side, and a non-skin side layer located on the side farther from the wearer's skin than the skin side layer,
The preferable range of the content T2 of the thermoplastic fiber of the inner layer sheet to be the skin side layer is 20% by mass or more, further 30% by mass or more, and most preferably 100% by mass, <1> ~ The pants-type disposable diaper described in any one of <17>.
<19>
A skin side layer closer to the wearer's skin side, and a non-skin side layer located on the side farther from the wearer's skin than the skin side layer,
The ratio ((S2/S1)×100) of the content S2 of the cellulosic fibers in the inner layer sheet serving as the skin side layer to the content S1 of the cellulosic fibers in the outer layer sheet serving as the non-skin side layer is preferably 90. % Or less, more preferably 80% or less, and most preferably 0%, the pants-type disposable diaper according to any one of <1> to <18>.
<20>
A skin side layer on the side closer to the wearer's skin side, and a non-skin side layer located on the side farther from the wearer's skin than the skin side layer,
The preferable range of the content S1 of the cellulosic fibers in the outer layer sheet which is the non-skin side layer is 35% by mass or more, more preferably 45% by mass or more, and 100% by mass is the most preferable. The pants-type disposable diaper according to any one of <19>.
<21>
A skin side layer on the side closer to the wearer's skin side, and a non-skin side layer located on the side farther from the wearer's skin than the skin side layer,
The preferable range of the content S2 of the cellulosic fibers in the inner layer sheet to be the skin side layer is 60% by mass or less, more preferably 50% by mass or less, and 0% by mass is the most preferable, in the above <1> to <20>. The pants-type disposable diaper described in any one of the items.

<22>
Ratio of cellulosic fiber content S3 at the longitudinal end of the side seal portion to cellulosic fiber content S5 at the longitudinal center of the side seal portion ((S3/S5)×100) Is preferably 90% or less, more preferably 80% or less, and most preferably 0%. The pants-type disposable diaper according to any one of <1> to <21> above.
<23>
The content S3 of the cellulosic fibers at the longitudinal end portion of the side seal portion is 60% by mass or less, more preferably 50% by mass or less, and most preferably 0% by mass. 22> The pants-type disposable diaper according to any one of <22>.
<24>
The content S5 of the cellulosic fibers in the central portion in the longitudinal direction of the side seal portion is 20% by mass or more, further 25% by mass or more, and 80% by mass or less, further 70% by mass or less. The pants-type disposable diaper according to any one of <1> to <23>.
<25>
A skin side layer closer to the wearer's skin side, a non-skin side layer positioned farther from the wearer's skin than the skin side layer, and a side farther from the wearer's skin than the non-skin side layer. A second non-skin side layer located,
The ratio ((T1/T3)×100) of the content T1 of the thermoplastic fibers of the outer layer sheet which is the non-skin side layer to the content T3 of the thermoplastic fibers of the outermost layer sheet which is the second non-skin side layer is The pants-type disposable diaper according to any one of <1> to <24>, which is preferably 90% or less, particularly preferably 80% or less, and most preferably 0%.
<26>
The preferred range of the content T3 is 30% by mass or more, more preferably 40% by mass or more, and most preferably 100% by mass. The pants-type disposable diaper according to <25>.

1 Pants-type disposable diaper 5 Absorbent body 6 Exterior body 61 Outer layer sheet 62 Inner layer sheet 63 Elastic member 68 Outermost layer sheet 69 One sheet 8 Side seal part

Claims (10)

An absorbent article comprising an absorbent main body and an exterior body arranged on the non-skin facing surface side thereof, which has a longitudinal direction corresponding to the front-back direction of the wearer,
A pair of side seals which are joined so that the skin facing surfaces at both side edges of the ventral side region of the exterior body and the skin facing surfaces at both side edges of the back side region of the exterior body are in contact with each other and extend in the longitudinal direction. Part is formed,
Of the ventral region and the dorsal region of the exterior body, at least the region adjacent to the side seal portion has elasticity in the lateral direction,
Of the side edges of each of the ventral region and the dorsal region, the portion forming the side seal portion contains a cellulosic fiber and a thermoplastic fiber,
In the side seal portion, the cellulosic fibers are oriented in a direction intersecting the longitudinal direction ,
The side edges of each of the ventral side region and the back side region are a skin side layer closer to the wearer's skin side, and a non-skin side positioned farther from the wearer's skin than the skin side layer. With layers,
A pants-type disposable diaper in which the content of the thermoplastic fiber is higher in the skin-side layer than in the non-skin-side layer . The pants-type disposable diaper according to claim 1, wherein the back side region of the outer package has a cellulose-containing layer containing the cellulosic fibers. The cellulosic fibers are short fibers, pants-type disposable diaper according to claim 1 or 2. The side edges of each of the ventral side region and the back side region are a skin side layer closer to the wearer's skin side, and a non-skin side positioned farther from the wearer's skin than the skin side layer. A layer and a second non-skin side layer located on the side farther from the wearer's skin than the non-skin side layer,
The content of the cellulosic fibers is higher in the non-skin side layer than in the skin side layer,
The content of the thermoplastic fibers, wherein the higher of the second non-skin side layer than the non-skin side layer, pants type disposable diaper according to any one of claims 1-3. The content rate of the cellulosic fibers in the side seal part is higher than the longitudinal center part of the side seal part, and the waist opening side end of the pants-type disposable diaper and the leg opening of the pants-type disposable diaper. is lower ends of the parts side, pants-type disposable diaper according to any one of claims 1-4. The side edges of each of the ventral side region and the back side region are a skin side layer closer to the wearer's skin side, and a non-skin side positioned farther from the wearer's skin than the skin side layer. With layers,
The content of the cellulosic fibers in the non-skin side layer is not less than 35 mass%, pants-type disposable diaper according to any one of claims 1-5. Wherein the side sealing portions, the side edges of the ventral region and side edge portions of the dorsal region is intermittently joined along the longitudinal direction of the side seal part, claim 1-6 The pants-type disposable diaper according to any one of 1. The cellulosic fibers are cotton fibers, pants type disposable diaper according to any one of claims 1-7. The cellulosic fibers are pulp fibers, pants-type disposable diaper according to any one of claims 1-7. In the longitudinal direction of the side seal portion, having a first portion containing the cellulosic fibers and a second portion not containing the cellulosic fibers,
Sealing the junction area of the first portion in the side seal portion is larger than the seal junction area of the second portion of the side seal portion, pants type disposable diaper according to any one of claims 1-9.

Images