JP2014094193A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper hardly causing a partial color change of an indicator before use.SOLUTION: In a disposable diaper 10, a cover sheet 40 is configured to overlap a skin non-contact side S1 of an absorbent core 40a, and in an overlap part A of a cover sheet 40b, an end part 41E of an inner sheet 41 and an outer sheet 42 are joined to each other, and an ene part 42E of the outer sheet 42 and the inner sheet 41 are joined to each other by a pressure sensitive adhesive 1. In a region where the pressure sensitive adhesive 1 is applied, a non-joint region B where the inner sheet 41 and the outer sheet 42 are not joined extends in a product longitudinal direction L, and an indicator 600 is provided in the non-joint region B.

Description

  The present invention relates to a disposable diaper.

  Conventionally, it has a front waistline region, a rear waistline region, and a crotch region located between the front waistline region and the back waistline region, and a pair of leg opening portions are formed and straddles the inseam region. Disposable diapers having an absorbent body extending toward the region and the rear waistline region are known.

  Here, in Patent Documents 1 and 2, in such disposable diapers, an indicator constituted by a color changing agent that changes color due to contact with moisture at a position visible from the non-skin contact surface side. A technique for providing the above is disclosed.

  The wear assistant can confirm the presence or absence of excretion of the wearer from the non-skin contact surface side of the disposable diaper due to the discoloration.

Japanese Patent No. 4086712 Japanese Patent Laid-Open No. 11-4852

  In the conventional disposable diaper, in order to clarify the degree of discoloration of the indicator, the indicator is configured to contact with a double-ply board that has been bonded.

  However, in the disposable diaper described above, since the absorbent core is covered with the mount, the component of the indicator penetrates into the mount and reacts with the moisture absorbed by the SAP (Superabsorbent Polymer). There is a problem that the indicator may change color before using such disposable diapers.

  Specifically, in the disposable diaper described above, since there is almost no space between the absorbent core and the indicator, depending on the mounting weight unevenness of the mount and the fixing level of the indicator, the indicator component can easily penetrate, and the absorbent core There is a problem that the indicator discolors before use of the disposable diaper due to moisture retained by the SAP.

  Furthermore, when the absorbent core is made thinner, the bulky pulp basis weight is reduced, and the SAP ratio is increased, thereby increasing the risk of SAP being exposed to the non-skin contact surface side of the absorbent core. In addition, there is a problem that the moisture held by the SAP easily promotes discoloration of the indicator.

  Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a disposable diaper that can make it difficult for the indicator to be partially discolored before use. To do.

  A first feature of the present invention is a disposable diaper having a front waistline region, a rear waistline region, a crotch region located between the front waistline region and the rear waistline region, and the crotch region A disposable diaper comprising an absorbent body that extends across the front waistline region and the rear waistline region and has a product longitudinal direction from the front waistline region toward the rear waistline region and a product width direction orthogonal to the product longitudinal direction The liquid-impermeable back sheet disposed on the non-skin contact surface side of the absorbent body, and provided between the back sheet and the absorbent body and visually contacted with moisture And the non-skin contact surface side and the skin contact surface side of the absorbent core constituting the absorbent body are covered with a liquid-permeable covering sheet. The covering sheet is The absorbent core is configured to overlap on the non-skin contact surface side, and the overlapping portion of the covering sheet is configured to extend along the longitudinal direction of the product, and in the overlapping portion of the covering sheet The end portion of the inner sheet and the outer sheet disposed on the non-skin contact surface side of the inner sheet are joined by the adhesive, and the end portion of the outer sheet and the inner sheet are joined. The non-joining area in which the inner sheet and the outer sheet are not joined between the areas where the adhesive is applied is configured to extend in the product longitudinal direction, and the indicator The gist of the region in which is provided is in the non-bonded region.

  According to the characteristic of this invention, the disposable diaper which can make it difficult to generate | occur | produce the situation that an indicator will discolor partially before use can be provided.

It is an expanded top view (skin contact surface side S2) of the disposable diaper concerning a 1st embodiment of the present invention. It is a development top view (non-skin contact surface side S1) of the disposable diaper concerning a 1st embodiment of the present invention. It is sectional drawing of the disposable diaper which concerns on this embodiment along the F1-F1 line | wire shown in FIG.1 and FIG.2. It is sectional drawing of the disposable diaper which concerns on this embodiment along the F1-F1 line | wire shown in FIG.1 and FIG.2. It is a figure which shows an example of the area | region where the adhesive is apply | coated to the coating sheet contained in the disposable diaper which concerns on the 1st Embodiment of this invention. It is sectional drawing (sectional drawing along F1-F1 line shown in FIG.1 and FIG.2) of the disposable diaper which concerns on the example of a change of this invention. It is sectional drawing (sectional drawing along F1-F1 line shown in FIG.1 and FIG.2) of the disposable diaper which concerns on the example of a change of this invention. It is sectional drawing (sectional drawing along F1-F1 line shown in FIG.1 and FIG.2) of the disposable diaper which concerns on the example of a change of this invention.

(First embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 5, the disposable diaper 10 which concerns on the 1st Embodiment of this invention is demonstrated.

  In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

  In the present embodiment, the tape-type disposable diaper 10 will be described as an example, but the present invention is also applicable to the pants-type disposable diaper 10.

  FIG. 1 is a developed plan view of the disposable diaper 10 according to this embodiment as viewed from the non-skin contact surface side S1, and FIG. 2 is a view of the disposable diaper 10 according to this embodiment as viewed from the skin contact surface S2 side. FIG. 3 is a sectional view of the disposable diaper 10 according to the present embodiment taken along line F1-F1 shown in FIG. 1, and FIG. 4 is a line F2-F2 shown in FIG. It is sectional drawing of the disposable diaper 10 which concerns on this embodiment along FIG. 5, FIG. 5 is a figure which shows an example of the area | region where the adhesive is apply | coated to the coating sheet 40b contained in the disposable diaper 10 which concerns on this embodiment. is there.

  1 and 2 show the elastic members (leg elastic members) of the leg stretchable part 75 and the leg side gathers 80 until the folds such as the top sheet 50 and the side flaps 70 constituting the disposable diaper 10 are not formed. ) 71 is a view of the extended state.

  As shown in FIGS. 1 and 2, the disposable diaper 10 according to this embodiment includes a front waistline region 20, a crotch region 25, and a back waistline region 30.

  Here, the front waistline region 20 is a portion in contact with the wearer's front waistline portion (abdomen portion), and the rear waistline region 30 is a portion in contact with the wearer's back waistline portion (back portion). Is a portion located between the front waistline region 20 and the back waistline region 30 and in contact with the wearer's crotch (excretion port).

  In the present embodiment, a direction from the front waistline region 20 to the rear waistline region 30 is referred to as a product longitudinal direction L, and a direction orthogonal to the product longitudinal direction L is referred to as a product width direction W.

  Here, the crotch portion 200 is formed in the crotch region 25, and the region on the abdomen side of the wearer than the crotch portion 200 is defined as the front waistline region 20, and the back side of the wearer from the crotch portion 200. Is defined as a rear front waistline region 30.

  In addition, the length (natural state) in the product longitudinal direction L of the rear waistline region 30 is configured to be longer than the length (natural state) in the product longitudinal direction L of the front waistline region 20.

  Moreover, a pair of leg periphery opening part 35 is formed in the disposable diaper 10 which concerns on this embodiment. The leg opening 35 is provided at a side end portion of the disposable diaper 10 in the product width direction W, and is disposed along the wearer's leg in a state where the disposable diaper 10 is worn by the wearer. It is.

  The disposable diaper 10 according to the present embodiment includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30.

  As shown in FIG.3 and FIG.4, the absorber 40 is comprised by the absorptive core 40a and the coating sheet (core wrap) 40b.

  The absorbent core 40a is the same as that used in conventional disposable diapers, and the absorbent core 40a can be appropriately configured using known members and materials such as pulverized pulp and SAP.

  Here, the SAP content in the absorbent core 40a may be configured to be 35% or more and 95% or less with respect to the total weight of the absorbent core 40a. More preferably, the SAP content in the absorbent core 40a is preferably 45% or more.

  By increasing the ratio of the SAP content to the total weight of the absorbent core 40a, the liquid absorption amount and the liquid retention amount of the absorbent core 40a can be increased.

  Moreover, SAP may be comprised so that more may exist in the non-skin contact surface side S1 than the skin contact surface side S2 in the absorptive core 40a.

  According to this structure, the speed | rate which takes in excrement in the absorptive core 40a can be made quick.

  Moreover, according to these structures, while having the effect of improving the absorption function of the disposable diaper 10, it can also suppress discoloration of an indicator.

  For example, the content of pulverized pulp in the absorbent core 40a is 100 to 300 gsm (for example, 220 gsm), and the content of SAP in the absorbent core 40a is 100 to 300 gsm (for example, 150 gsm).

The covering sheet 40b is a sheet that covers the absorbent core 40a. For example, as a member constituting the covering sheet 40b, an air-through fiber nonwoven fabric having a mass of about 10 to 30 g / m ² , a spunbond nonwoven fabric, an SMS (spunbond-meltblown-spunbond) nonwoven fabric, a mass of about 10 to 30 g / An m ² tissue sheet can be used.

  Specifically, the non-skin contact surface side S1 and the skin contact surface side S2 of the absorbent core 40a are covered with a cover sheet 40b.

  For example, the covering sheet 40b may be configured to wrap the entire absorbent core 40a.

  As shown in FIG. 3, the covering sheet 40b is configured to overlap on the non-skin contact surface side S1 of the absorbent core 40a (see the part A in FIG. 3).

  Here, the overlapping part A of the covering sheet 40b is configured to extend along the product longitudinal direction L.

  Further, as shown in FIG. 3, in the overlapping portion A of the covering sheet 40b, the end portion 41E of the inner sheet 41 and the outer sheet 42 are joined by the adhesive 1 such as hot melt adhesive (HMA), and the outer side The end portion 4E of the sheet 42 and the inner sheet 41 are configured to be joined.

  Here, the inner sheet 41 is a covering sheet that is disposed on the absorbent core 40a side in the overlapping portion A of the covering sheet 40b and is joined to the absorbent core 40a, and the outer sheet 41 is the covering sheet 40b. In the overlapping part A, it is a covering sheet disposed on the opposite side of the absorbent core 40a.

  Moreover, the non-joining area | region B where the inner sheet | seat 41 and the outer sheet | seat 42 are not joined between the area | regions where the adhesive 1 is apply | coated is comprised so that it may extend in the product longitudinal direction L. FIG.

  As shown in FIGS. 3 and 4, the skin contact surface side S <b> 2 of the absorber 40 is provided with a liquid-permeable top sheet 50, and the non-skin contact surface side S <b> 1 of the absorber 40 is A liquid-impermeable back sheet 60a is provided.

  In addition, the back sheet 60a is comprised with the film and the nonwoven fabric sheet. Here, the design which can be visually recognized from the non-skin contact surface side S1 of the disposable diaper 10 is provided on this film.

  Moreover, the indicator 600 comprised with the color change agent visually changed when it contacts with a water | moisture content is provided between the back seat | sheet 60a and the absorber 40. FIG.

  The indicator 600 may be provided in the center region in the product width direction W and in the non-joining region B.

  Furthermore, the direction in which the indicator 600 extends may be configured to coincide with the direction in which the water absorption of the clem in the covering sheet 40b is high.

  As shown in FIG. 2, the direction in which the indicator 600 extends corresponds to the product longitudinal direction L.

  In addition, about the Klem water absorption of the coating sheet 40b, it can measure according to JIS-P8141.

  Specifically, first, in the direction perpendicular to the direction in which the sample 1 cut into a strip shape having a predetermined dimension (width 20 mm, length 200 mm) and the indicator 600 extends along the direction in which the indicator 600 extends. A sample 2 cut out along the extending direction is prepared.

  Second, the vertical direction of the samples 1 and 2 is the vertical direction, and the bottom of the samples 1 and 2 is immersed in distilled water up to a portion of 15 mm, and 10 minutes ± 10 seconds after the immersion, the samples 1 and 2 are immersed. The distance (mm) at which distilled water was sucked up from the lower end of the tube was measured.

  Third, the measured value is “Klem water absorption height”, and the Klem water absorption heights of Samples 1 and 2 are compared. Which of Samples 1 and 2 matches the direction in which the Klem water absorption of the covering sheet 40b is high. It is determined whether or not it is a configuration.

  According to such a configuration, the extending direction of the indicator 600 is matched with the direction in which the water absorption of the clem in the covering sheet 40b is high, so that even when the plurality of covering sheets 40b are stacked, the indicator 600 is aligned. Since the moisture of excrement can be diffused, it is possible to prevent the indicator 600 from being insufficiently discolored.

  If the length of the indicator 600 in the product width direction W is too wide, the entire area in the product width direction W of the indicator 600 cannot be discolored when discolored due to excrement, causing unevenness. It is preferable that the replacement timing is not too wide because it may misunderstand the replacement timing.

  From this viewpoint, the length of the indicator 600 in the product width direction W is preferably 1 mm or more and 10 mm or less, and more preferably 1 mm or more and 5 mm or less.

  In addition, at least a part of the skin contact surface side S2 of the covering sheet 40b has liquid permeability.

  Here, according to the viewpoint of unevenness in basis weight, the basis weight of the covering sheet 40b is preferably 7 gsm or more. According to the viewpoint of liquid permeability, in order to change the indicator 600 even if the amount of excretion is small, The basis weight of the sheet 40b is preferably 20 gsm or less, and more preferably 10 to 15 gsm.

  Further, in the non-bonded region B, by loosening the outer sheet 42, as shown in FIG. 3, in order to make it easier to form a plurality of wrinkles on the skin contact surface side S2 of the outer sheet 42, a plurality of protrusions are formed. It may be configured to form a shape.

  Accordingly, the length of the inner sheet 41 in the non-bonded region B in the product width direction W in the stretched state without wrinkles is configured to be different from the length of the outer sheet 42 in the non-bonded region B in the product width direction W. ing.

  According to this configuration, since a space is generated between the indicator 600 and the absorbent core 40a, the indicator 600 and the absorbent core 40a are difficult to contact.

  Further, the outer sheet 42 may be joined to the inner sheet 41 in an area where the indicator 600 is not provided. According to such a configuration, it is possible to suppress deformation of the absorbent core 40a when the disposable diaper 10 is worn, and it is possible to prevent the SAP from coming out of the covering sheet 40b by the covering sheet 40b.

  Moreover, as shown in FIG.1, FIG3 and FIG.4, in the disposable diaper 10 which concerns on this embodiment, the center O of the product width direction W is set in the crotch part 200, more specifically in the crotch region 25. An extendable / contractible expansion member 200a (crotch expansion / contraction part) may be provided in the absorber arrangement region where the absorber 40 is arranged to straddle.

  Here, the stretchable member 200a may be stretchable in the product longitudinal direction L, may be stretchable in the product width direction W, or stretchable in both the product longitudinal direction L and the product width direction W. It may be.

  The center O2 of the elastic member 200a in the product longitudinal direction L is disposed closer to the front waistline region 20 than the center O1 of the disposable diaper 10 in the product longitudinal direction L. Moreover, the elastic member 200a is arrange | positioned so that the center O1 of the disposable diaper 10 in the product longitudinal direction L may be straddled.

  More specifically, the expandable member 200a is provided so as to overlap the region where the indicator 600 is provided. The elastic member 200a is disposed between the back sheet 60a and the covering sheet 40b covering the non-skin contact surface side S1 of the absorbent core 40a.

Such a stretchable member 200a is configured so as to remain flat without generating irregularities (creases) even in a contracted state in a natural state.

Accordingly, by the contraction of such elastic members 200a, the non-bonding region B, as shown in FIG. 3, a plurality of convex between the inner sheet 41 and outer sheet 42 made of a non-stretchable sheet is formed, the As a result, a space is created between the inner sheet 41 and the outer sheet 42.

  Further, the indicator 600 is provided in the area where the indicator 600 is provided because the S1 side expansion / contraction member 200a and the S2 side outer sheet 42 which are in contact with the indicator 600 are joined to each other by the indicator 600. The outer sheet 42 mainly contracts in the region where the rigidity is higher than the adjacent region where no indicator 600 is provided.

  As a result, the absorbent core 40a and the indicator 600 are more difficult to contact.

Similarly, since the stretchable member 200a remains flat even in a contracted state in the natural state, the non-stretchable backsheet 60a has a shape that protrudes toward the non-skin contact surface side S1, and is non-skinned. Even if pressure is applied from the contact surface side S1, the impact can be reduced, and the space between the indicator 600 and the absorbent core 40b can be maintained.

  In consideration of the pressure in the package, in addition to joining the indicator 600 and the outer sheet 42, the stretchable member 200 a and the indicator 600 are joined in a stacked manner, so that the stretchable member 200 a of the stretched member 200 a is also in a natural state (package enclosed state). It is preferable that the inner sheet 41 and the outer sheet 42 be wrinkled by contraction so that the space between the inner sheet 41 and the outer sheet 42 can be maintained.

  In such a state, in order to maintain the space between the indicator 600 and the absorbent core 40b, the back sheet 60a, the exterior sheet 60, and the elastic member 200a are preferably highly rigid.

  Here, in consideration of flexibility and tactile sensation at the time of wearing, the basis weight of the film constituting the back sheet 60a is 10 to 30 gsm, and the basis weight of the nonwoven fabric sheet constituting the back sheet 60a is 10 to 40 gsm. The basis weight of the member 200a is preferably 20 to 50 gsm.

In addition, since the frequency of occurrence of the uneven shape and the height of the uneven shape are increased, and the space between the indicator 600 and the absorbent core 40b is easily maintained, it is preferable that the expansion / contraction rate of the expansion / contraction member 200a is high.

  However, considering the tactile sensation, the expansion / contraction rate of the expansion / contraction member 200a is preferably 1.1 to 1.8 times.

  The expansion / contraction rate means the degree of expansion / contraction of the expansion / contraction member 200a in the expansion / contraction direction (product longitudinal direction L in the present embodiment), and is defined as follows.

Expansion / contraction rate = (length in the expansion / contraction direction of the expansion / contraction member 200a in the maximum expansion state) / (length in the expansion / contraction direction of the expansion / contraction member 200a in the natural state)
In addition, in this specification, this expansion / contraction rate shall be measured as follows, for example.

  1stly, when the disposable diaper 10 is enclosed with the package etc., the disposable diaper 10 is taken out from a package, and it is 60 in the atmosphere of 20 degreeC +/- 2 degreeC and relative humidity 60% +/- 5% RH in the state. Leave for a minute and measure the length of the stretchable member 200a along the stretch direction. This length is defined as “the length of the elastic member 200a in the natural state”.

  In addition, this measurement was performed using a spring measure manufactured by Shinwa Measurement Co., Ltd. (tape portion: polyvinyl chloride coated with glass fiber) so as to be along the measurement target site (10 samples).

  Second, the length in the stretch direction of the desired region in such a state (ie, the natural state), and the length in the stretch direction of the desired region when stretched from the natural state to a state where wrinkles by the elastic member cannot be visually confirmed. Measure the thickness. This length is defined as “the length of the elastic member 200a in the extended state”.

  Using these measurement results, the elongation percentage is measured by calculating with the above formula.

  Furthermore, in the region where the indicator 600 is provided, the elastic member 200a is preferably joined to the outer sheet 42 and the back sheet 60a.

  According to such a configuration, in the region where the indicator 600 is provided, the non-skin contact surface side sheet S1 (the elastic member 200a, the back sheet 60a, the exterior sheet 60, and the like) is closer than the indicator 600. It becomes easy to visually recognize the discoloration of the indicator 600 from the non-skin contact surface side S1.

  As shown in FIG.3 and FIG.4, the exterior sheet 60 comprised with the nonwoven fabric sheet may be provided in the non-skin contact surface side S1 of the back sheet 60a. The exterior sheet 60 is embossed in a direction intersecting with the expansion / contraction direction.

  In addition, the back sheet 60a and the exterior sheet 60 may be joined to each other by a dot pattern or a line pattern.

  Side flaps 70 are respectively provided at both side edges in the product width direction W of the absorber 40. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets.

  Moreover, as shown in FIG.1 and FIG.2, the fastening tape 90 is provided in the pair of side flaps 70, respectively.

  The fastening tape 90 extends in the product width direction W in the rear waistline region 30, and is attached to the target unit 95 disposed on the non-skin contact surface of the front waistline region 20, so that the disposable diaper 10 is worn by the wearer. Configured to hold on to the body.

  Further, as shown in FIGS. 1 to 3, a pair of leg stretchable portions formed between the side flaps 70 and the exterior sheet 60 along the leg opening 35 and stretchable in at least the product longitudinal direction L. (Leg Gather) 75 is provided.

  Further, as shown in FIG. 1, a pair of leg side gathers 80 extending along the product longitudinal direction L may be provided inside the pair of leg stretchable parts 75 (near the center O in the product width direction W). Good.

  The leg side gathers 80 are provided at the inner end of the side flap 70 in the product width direction W, and are erecting and expanding gathers that are disposed on the inner side in the product width direction W than the leg stretchable parts 75.

  The side flap 70 is folded back to the top sheet 50 side at the inner end in the product width direction W, and is laminated in two layers.

  As shown in FIG. 3, an elastic member 71 is provided between the side flaps 70 in a stacked state in a state where the elastic member 71 is extended in the product longitudinal direction L. A leg side gather 80 is formed by the side flap 70 and the elastic member 71.

  The leg side gather 80 has a joining portion 81 joined to the top sheet 50 or the back sheet 60a, and a free end portion 82 on which the elastic member 71 is disposed.

  Of the free end portion 82, the central portion in the product longitudinal direction L including the crotch region 25 is contracted in the product longitudinal direction L by the elastic member 71.

  When the disposable diaper 10 is worn, the leg side gather 80 rises with the joint portion 81 as the base end portion, and the contraction portion 84 of the free end portion 82 contacts the wearer's skin with the apex portion. That is, the joint portion becomes the base end portion of the rising side of the leg side stretchable portion.

  Further, in FIG. 1, in the leg side gather 80, a joining portion 81 where the side flap 70 and the top sheet 50 (or the back sheet 60 a or the like) are joined is indicated by hatching.

  In the disposable diaper 10 which concerns on this embodiment, the waist elastic part 100 comprised by the elastic sheet may be provided.

  Moreover, as shown in FIG. 1, the absorber 40 may have the low rigidity area | region 210 in which the fabric weight is lower than the other part of the absorber 40 in the back waist area 30, or the absorptive core 40a does not exist. .

  Since the low-rigidity region 210 and the waist stretchable portion 100 that contracts in the product width direction W overlap, the absorbent cores 40a outside the product-width direction W of the low-rigidity region 210 are brought closer to the center of the product width direction W, and are cup-shaped. It becomes a shape that is easier to follow along the wearer's buttocks.

  Furthermore, the absorber 40 has the expansion / contraction suppression area | region 220 which is an area | region where the expansion-contraction in the product width direction W was suppressed rather than the other area | region.

  Here, the expansion / contraction suppression region 220 is formed outside the low-rigidity region 210 in the product width direction W, as shown in FIG.

  Further, the boundary between the expansion / contraction suppression region 220 and the low rigidity region 210 is formed by an arc that protrudes toward the center in the product width direction W. According to this configuration, the wear assistant can be given an image of the shape of the buttocks of the wearer.

  As shown in FIG. 1, a notch 110 and a notch 120 are formed in the crotch region 25 of the absorber 40. The notch part 110 and the notch part 120 are areas where the absorbent core 40 a constituting the absorber 40 does not exist.

  Instead of forming the notch portion 110 and the notch portion 120, the basis weight of the absorbent core 40a may be made lower than the portion of the other absorbent core 40a.

  As shown in FIG. 1, the notch part 110 and the notch part 120 are formed along the edge part in the product longitudinal direction L of the expansion-contraction member 200a.

  The cutout portion 110 and the cutout portion 120 are configured such that the length (natural state) in the product longitudinal direction L becomes longer as going outward in the product width direction W.

  The edge of the notch 110 on the front waistline region 20 side in the product longitudinal direction L constitutes a first inflection portion 115, and the edge of the notch 120 on the product longitudinal direction L on the back front waistline region 30 side is 2 inflection part 125 is constituted.

  In addition, the 1st inflection part 115 and the 2nd inflection part 125 are extended along the product width direction W, and are comprised so that it may become a bending origin of the disposable diaper 10. FIG.

  Next, an example of the manufacturing method of the disposable diaper 10 which concerns on this embodiment is demonstrated. In addition, about the manufacturing method which is not demonstrated in this embodiment, the existing method can be used. Moreover, the manufacturing method demonstrated below is an example and can also manufacture the disposable diaper 10 which concerns on this embodiment with another manufacturing method. The manufacturing method of this disposable diaper 10 includes at least a component forming process, a component placing process, a leg periphery forming process, and a cutting process.

  In the component forming process, a component (for example, the absorber 40) constituting the disposable diaper 10 is formed.

  In the component placement step, disposable diapers such as the elastic sheet constituting the leg stretchable part 75, the other web such as the web constituting the top sheet 50, the absorbent body 40, etc. on the web constituting the back sheet 60a The component which comprises 10 is mounted.

Here, changing in the step of covering the absorbent core 40a by covering sheet 40b, a material conveying speed of the portion corresponding to the outer sheet 42 (feed rate) and material conveying speed (feed rate) of the portion corresponding to the inner sheet 41 Alternatively, it is possible to provide a slack by covering the absorbent core 40a while loosening one of the inner sheet 41 and the outer sheet 42 by changing the resistance of the conveyance lines at both portions.

  In the leg formation step, the top sheet 50, the exterior sheet 60, the back sheet 60a, and a part of the elastic sheet constituting the leg elastic part 75 are cut along the outer end of the leg elastic part 75 in the MD direction. . Thereby, the leg periphery opening part 35 arrange | positioned around a wearer's leg is formed.

  In the cutting step, the continuous body on which the top sheet 50, the back sheet 60a, the absorber 40, and the like are arranged is cut into the size of one product along the MD direction. Thereby, the disposable diaper 10 is manufactured.

  According to the disposable diaper 10 according to the present embodiment, a space is created between the inner sheet 41 and the outer sheet 42, the absorbent core 40a and the indicator 600 are difficult to contact, and the indicator 600 is discharged before the wearer excretes. Can be avoided.

  Further, according to the disposable diaper 10 according to the present embodiment, when the wearer excretes, the inner sheet 41 and the outer sheet 42 are wetted by excretion liquid, and the surface tension of the liquid interposed between the inner sheet 41 and the outer sheet 42 is increased. Accordingly, the inner sheet 41 and the outer sheet 42 are in close contact with each other, and the adhesive 1 does not exist between them, so that the indicator 600 can be quickly discolored.

Moreover, according to the disposable diaper 10 which concerns on this embodiment, since the adhesive 1 does not exist in the site | part A where the inner sheet | seat 41 and the outer sheet | seat 42 which can become the highest fabric weight overlap, it can be finished in the soft absorber 40. .
(Example of change)
The disposable diaper 10 which concerns on the example of a change of this invention is demonstrated paying attention to difference with the disposable diaper 10 which concerns on the above-mentioned 1st Embodiment.

  In the disposable diaper 10 according to this modified example, as shown in FIG. 6, the above-described elastic member 200a may not be provided.

  Moreover, in the disposable diaper 10 which concerns on this modified example, as shown in FIG. 7, the edge part 42E of the outer side sheet | seat 42 may be comprised so that it may be return | folded by the inner side sheet | seat 41 side.

  Or in the disposable diaper 10 which concerns on this modification, the edge part 41E of the inner side sheet | seat 41 may be comprised so that it may be return | folded by the outer side sheet | seat 42 side.

  Alternatively, in the disposable diaper 10 according to this modified example, the end portion 42E of the outer sheet 42 is configured to be folded back to the inner sheet 41 side, and the end portion 41E of the inner sheet 41 is the outer sheet 42 side. It may be configured to be folded back.

  According to these configurations, a wider space can be formed between the absorbent core 40a and the indicator 600 by the folded portion of the end portion 41E of the inner sheet 41 or the end portion 42E of the outer sheet 42.

  In addition, the thickness of the folding | returning site | part of the edge part 41E of the inner side sheet 41 or the edge part 42E of the outer side sheet | seat 42 is 0.05-0.3 mm from a viewpoint of the above-mentioned space ensuring and quick discoloration at the time of a wearer's excretion. Preferably there is.

  Furthermore, in the disposable diaper 10 according to this modified example, as shown in FIG. 8, a sheet 2 such as a nonwoven fabric sheet is provided between the inner sheet 41 and the outer sheet 42 in an area where the indicator 600 is not provided. It may be.

  According to such a configuration, a wider space can be formed between the absorbent core 40 a and the indicator 600 by the sheet 2.

  In addition, it is preferable that the thickness of this sheet | seat 2 is 0.05-0.3 mm from a viewpoint of the above-mentioned space ensuring and quick discoloration at the time of a wearer's excretion.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 10 ... Disposable diaper 20 ... Front waist area 25 ... Inseam area 30 ... Rear waist area 35 ... Leg opening 40 ... Absorber 40a ... Absorbent core 40b ... Cover sheet (core wrap)
50 ... Top sheet 60a ... Back sheet 60 ... Exterior sheet 70 ... Side flap 71 ... Elastic member 75 ... Leg stretchable part 80 ... Leg side gather 81 ... Joint part 82 ... Free end part 90 ... Fastening tape 95 ... Target part 100 ... West Telescopic parts 110, 120 ... cutout part 115 ... first inflection part 125 ... second inflection part 200 ... crotch part 200a ... telescopic member 600 ... indicator

Claims (8)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
An absorbent body extending across the crotch region and extending toward the front waistline region and the rear waistline region,
A disposable diaper having a product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
A liquid-impermeable back sheet disposed on the non-skin contact surface side of the absorbent body;
Provided between the backsheet and the absorber, and comprises an indicator configured to change visually when in contact with moisture;
The non-skin contact surface side and the skin contact surface side of the absorbent core constituting the absorber are covered with a liquid-permeable coating sheet,
The covering sheet is configured to overlap on the non-skin contact surface side of the absorbent core,
The overlapping part of the covering sheet is configured to extend along the longitudinal direction of the product,
In the overlapping part of the covering sheet, the end portion of the inner sheet and the outer sheet disposed on the non-skin contact surface side of the inner sheet are joined by an adhesive, and the end portion of the outer sheet and the inner sheet are joined. And are configured to be joined,
Between the areas where the pressure-sensitive adhesive is applied, a non-bonded area where the inner sheet and the outer sheet are not bonded is configured to extend in the product longitudinal direction,
The disposable diaper characterized in that the indicator is provided in the non-joining region.   In the stretched state without wrinkles, the length in the product width direction of the inner sheet in the non-joining region is configured to be different from the length in the product width direction of the outer sheet in the non-joining region. The disposable diaper of Claim 1 characterized by the above-mentioned. An elastic member is provided to overlap the area where the indicator is provided,
The disposable diaper according to claim 1 or 2, wherein the indicator is provided in a central region in the product width direction.   The disposable diaper according to any one of claims 1 to 3, wherein at least one end of the inner sheet and the outer sheet is configured to be folded back to the other side. The absorbent core has a superabsorbent polymer;
The content of the superabsorbent polymer in the absorbent core is configured to be 35% or more and 95% or less with respect to the total weight of the absorbent core,
5. The superabsorbent polymer is configured to be present more in the non-skin contact surface side than in the skin contact surface side in the absorbent core. The disposable diaper described in the item.   The disposable diaper according to any one of claims 1 to 5, wherein a direction in which the indicator extends is configured to coincide with a direction in which the water absorption by the cover sheet is high.   The disposable diaper according to claim 3, wherein the elastic member is disposed between the back sheet and the covering sheet covering the non-skin contact surface side of the absorbent core. On the non-skin contact surface side of the backsheet, it has an exterior sheet constituted by a nonwoven fabric sheet having an embossed row in a direction intersecting with the expansion and contraction direction,
The disposable diaper according to any one of claims 1 to 7, wherein the back sheet and the exterior sheet are joined to each other in a dot pattern or a line pattern.

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