TWI508709B - Absorbent items - Google Patents

Description

Absorbent article

The present invention relates to an absorbent article such as a disposable diaper.

Previously, disposable diapers including an indicator for judging whether or not the wearer excreted by color were known. For example, Patent Document 1 describes a disposable diaper which is useful for informing a mother that an indicator of excretion of urine is interposed between a back sheet and an absorbent body. The disposable diaper described in Patent Document 1 is capable of easily recognizing a diaper which is discolored by urination or the like excreted from the outside.

As another technique, Patent Document 2 describes an absorbent article including an absorbent body formed with a groove-like space extending in the planar direction.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2005-21390

Patent Document 2: Japanese Patent Laid-Open Publication No. 2009-119154

The disposable diaper described in Patent Document 1 is easy to recognize the discoloration caused by urination due to excretion, etc., as described above, but it is also desirable for the consumer to have a small amount of excrement. The need to identify discoloration and replace the diaper.

Further, in Patent Document 2, there is no description as to how the indicator is disposed in the absorbent article in the absorbent article including the absorbent body formed with the groove-like space extending in the planar direction.

Accordingly, the present invention is directed to providing an absorbent article that satisfies the above needs.

The present invention relates to an absorbent article comprising a front sheet disposed on the opposite side of the skin, a back sheet disposed on the non-skin facing side, and a longitudinal absorbent disposed between the sheets The indicator is continuously disposed in the longitudinal direction between the back sheet and the absorber, and is instructed to be excreted by a change in color. The absorbent body has an absorbent core including an absorbing polymer, and the absorbent core has a relatively high basis weight and a high basis weight which is convex toward the back sheet side, and is adjacent to the high basis weight portion. a low basis weight which is relatively low in basis weight and which is recessed from the side of the back sheet to the side of the front sheet is alternately formed in the longitudinal direction, and the high basis weight is integrally formed with the low basis weight on the back surface The side of the sheet to which the indicator is applied is formed with an uneven structure in which the high basis weight portion and the low basis weight portion are alternately arranged in the direction in which the indicator extends.

1‧‧‧Disposable diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧ indicator

7‧‧‧Buckle belt

6‧‧‧Three-dimensional folds

8‧‧‧ buckle belt

9, 9X, 9Y, 56, 57, 58, 71‧‧‧ space

10‧‧‧Adhesive

41, 41A, 41B, 41C‧‧‧absorbent core

42‧‧‧Covered timber

43‧‧‧High base

44, 44X, 44Y‧‧‧ low basis weight

45‧‧‧Absorbable materials

46‧‧‧ Deposits

46a‧‧‧Materials for difficult-to-breathable components

46b‧‧‧Regional Correspondence Department

49‧‧‧ Absorbent body forebody

50‧‧‧Rotating cylinder

51‧‧‧Cylinder recess

52‧‧‧ stencil

53‧‧‧Insufficient gas-permeable components

54‧‧‧Area

60‧‧‧ catheter

61‧‧‧Flexible components

62‧‧‧Three-dimensional pleat forming sheet

63‧‧‧ Leg elastic members

64‧‧‧Low elastic members

65, 84‧‧‧vacuum box

67‧‧‧Exhaust pipe

70‧‧‧Feed roller

75‧‧‧Net belt

80‧‧‧Vacuum conveyor

81‧‧‧ drive roller

82‧‧‧ driven roller

83‧‧‧ breathable belt

90‧‧‧ Pressurizing mechanism

91, 92‧‧‧ Roll

411‧‧‧square shape area

The ventral side of the 411a‧‧‧ square shaped area

411b‧‧‧back side of the square shape area

411c‧‧‧ under the square shape area

412‧‧‧ non-square area

601‧‧‧ downstream side end

A‧‧‧ ventral side

B‧‧‧Back side

C‧‧‧Lower Department

CL‧‧‧ center line

L1, L2, L3‧‧‧ average length

R1, R2‧‧‧ arrows

W1, W2‧‧‧ width

X, Y‧‧ direction

Fig. 1 is a partially broken plan view showing the unfolded diaper of the unfolded type of the embodiment of the present invention viewed from the side of the front sheet.

Figure 2 is a cross-sectional view taken along line I-I of Figure 1.

Figure 3 is a cross-sectional view taken along line II-II of the disposable diaper of Figure 1 after absorbing a small amount of body fluid.

Fig. 4 is a schematic view showing an example of a manufacturing apparatus of an absorbent body used in the unfolded diaper according to the embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view showing a portion (recessed portion) of the outer peripheral surface side of the rotary cylinder shown in Fig. 4 in the width direction.

Fig. 6 is a schematic cross-sectional view showing a state in which an absorbent material is deposited in a concave portion of the rotary cylinder shown in Fig. 4 .

Fig. 7 is a plan view showing the absorbent core of the disposable diaper shown in Fig. 1 as seen from the side of the back sheet.

Fig. 8 is a plan view of the absorbent core used in the disposable diaper according to another embodiment of the present invention as seen from the side of the back sheet.

Figure 9 is a disposable diaper according to another embodiment of the present invention as seen from the side of the back sheet. Top view of the absorbent core used in the process.

Fig. 10 is a plan view of the absorbent core used in the disposable diaper according to another embodiment of the present invention as seen from the side of the back sheet.

Hereinafter, the absorbent article of the present invention will be described with reference to Figs. 1 to 3 based on preferred embodiments. Fig. 1 is a plan view showing a partial fracture of the unfolded diaper according to the embodiment of the present invention as seen from the side of the front sheet, and Fig. 2 is a cross-sectional view taken along line I-I of Fig. 1. 3 is a cross-sectional view taken along line II-II of the disposable diaper of FIG. 1 after absorbing a small amount of body fluid.

As shown in Fig. 1, the disposable diaper 1 of the present embodiment (hereinafter also referred to as "diaper 1") includes a front sheet 2 disposed on the opposite side of the skin, and a back sheet disposed on the non-skin facing side. 3. In the longitudinally long absorbent body 4 disposed between the two sheets 2 and 3, between the back sheet 3 and the absorber 4, the discharge is continuously arranged in the longitudinal direction by the change in color. Indicator 5. As shown in Fig. 1, the diaper 1 is formed to be bilaterally symmetrical with respect to a center line CL extending in the longitudinal direction.

The diaper 1 of the present embodiment will be described in detail. As shown in Fig. 1, the diaper 1 has a diaper 1 in the longitudinal direction in the unfolded state (hereinafter also referred to as "Y direction", and Y direction: refers to parallel to the center line CL. The direction is 3 divided into a ventral side A, a back side B, and a lower portion C between the A and B. The ventral side A is located on the ventral side of the wearer when the diaper is worn, the back side B is located on the back side of the wearer, and the lower chin C is located on the lower jaw of the wearer. The crotch portion C is located at the central portion of the diaper 1 in the longitudinal direction (Y direction). In addition, the direction orthogonal to the longitudinal direction (Y direction) is described as the lateral direction of the diaper 1 (hereinafter also referred to as "X direction").

In the present specification, the term "skin-facing surface" refers to the surface of the front and back surfaces of the members constituting the diaper 1 such as the front sheet 2, which are disposed on the skin side of the wearer when worn. "face" means the front and back sides of each member such as the front sheet 2 When worn, it faces the opposite side of the skin side of the wearer.

As shown in Fig. 1, the left and right side edges of the abdominal side portion A of the diaper 1 and the left and right side edges of the back side portion B are more outward in the lateral direction (X direction) than the left and right side edges of the lower jaw portion C, respectively. Extend. Further, the left and right side edges of the crotch portion C are curved inward in the lateral direction (X direction), and have a shape in which the central portion in the longitudinal direction (Y direction) is tapered inward. The front sheet 2 and the back sheet 3 project outward from the left and right side edges and the front and rear end edges of the absorber 4, respectively. As shown in FIG. 2, the dimension of the front surface sheet 2 in the lateral direction (X direction) is smaller than the dimension of the back surface sheet 3 in the lateral direction (X direction). The front sheet 2 and the back sheet 3 are joined to each other by the projecting portion which protrudes outward from the peripheral edge of the absorber 4, or are sandwiched by other members, and the absorber 4 is sandwiched and fixed.

As shown in Fig. 1, the diaper 1 is a so-called unfolded type diaper, and a pair of fastening tapes 7, 7 are provided on the left and right side edges of the back side portion B, and the outer surface of the abdominal side portion A (non-skin opposite surface) The buckle 8 for fixing the fastening tapes 7, 7 is provided. As shown in Fig. 1, each of the two sides of the diaper 1 in the longitudinal direction (Y direction) is provided with and fixed to the three-dimensional pleat forming sheet 62 having the elastic member 61 fixed in the Y direction in a stretched state. The side portions of the front sheet 2 form a pair of three-dimensional pleats 6, 6 (see Fig. 2). Further, as shown in Fig. 1, in each of the both side portions of the diaper 1 in the longitudinal direction (Y direction), the plurality of leg elastic members 63 for forming the leg gathers are placed in the Y direction in a stretched state. The leg gathers are formed by the contraction of the leg elastic members 63. Further, at the end portion in the longitudinal direction (Y direction) of the back side portion B side of the diaper 1, the waist elastic member 64 for forming the waist gathers is placed in the X direction in the stretched state, and is formed by the contraction of the waist elastic member 64. Waist folds.

The absorbent body 4 has an absorbent core 41 containing an absorbent polymer, and has a covering material 42 covering the absorbent core 41 in the diaper 1. Further, the absorbent core 41 is covered with a covering material 42. In the diaper 1, the absorbent body 4 is coated with a liquid-retaining absorbent core which is long in the longitudinal direction (Y direction) by the covering material 42 which is a liquid-permeable hydrophilic sheet as shown in FIG. Formed by body 41. Specifically, as shown in Figure 2 The covering member 42 of the diaper 1 is formed on the back sheet 3 side of the absorbent core 41 so that the overlapping portion 420 in which the side edges of the covering member 42 overlap each other is formed to coat the absorbent core 41. The absorbent body 4 of the diaper 1 is formed by coating the absorbent core 41 with the covering material 42 as described above.

The absorbent core 41 has a high basis weight portion 43 having a relatively high basis weight and protruding toward the back sheet 3, and a high basis weight portion 43, a relatively low basis weight, and a side surface from the back sheet 3 The low basis weight 44 is recessed on the side of the sheet 2. As described in detail in the diaper 1, as shown in Figs. 1 and 2, the absorbent core 41 constituting the absorbent body 4 has a high basis weight portion 43 and an absorbent material having a lower absorbent base portion 44. The higher basis weight portion 43 has a lower basis weight portion 44 (44X, 44Y). As shown in FIG. 1, the absorptive core 41 is formed with a plurality of low basis weight portions 44X extending in a line direction (X-direction) and extending in the longitudinal direction (Y direction). The low basis weight portion 44Y of the linear shape (continuous linear shape). As shown in FIG. 1, the low basis weight portion 44 is formed by a linear low base portion 44X extending in the lateral direction (X direction) and a linear low basis portion 44Y extending in the longitudinal direction (Y direction). The whole is formed in a lattice shape, and the high basis weight portion 43 is disposed at a portion (the position of the lattice eye) partitioned by the linear low basis weight portions 44X and 44Y.

In the present invention, as shown in FIG. 2, the high basis weight portion 43 of the absorbent core 41 and the low basis weight portion 44 are integrally formed. Here, "molding into one body" means that the high basis weight portion 43 and the low basis weight portion 44 are not integrated with each other without being joined by a bonding means such as an adhesive or heat fusion, and are integrally formed of the same material. Thus, the high basis weight portion 43 and the low basis weight portion 44 are integrally formed, and the continuity of the body fluid can be smoothly moved. A method of manufacturing such an absorbent body 4 will be described below.

Further, as shown in Fig. 1, the absorbent core 41 is formed on the side of the back sheet 3 to which the indicator 5 is provided, and the direction in which the high basis weight portion 43 and the low basis weight portion 44 (44X) extend along the indicator 5 is formed. The uneven structure is alternately arranged. In other words, the side of the front sheet 2 of the absorbent core 41 is flat, and a concave-convex structure is formed on the side of the back sheet 3 opposed to the indicator 5. More specifically, as shown in FIG. 2, the high basis weight portion 43 protrudes toward the back sheet 3 side, and the low basis weight The portion 44 (44X, 44Y) is recessed toward the side of the front sheet 2. In other words, the concave portion (groove) which is recessed toward the front sheet 2 side in the uneven structure of the absorbent core 41 is mainly formed by the low basis weight portion 44 (44X, 44Y), and the unevenness in the concave-convex structure of the absorbent core 41 The convex portion on the side of the back sheet 3 is mainly formed of the high basis weight portion 43. Here, the term "the concave portion is mainly formed by the low basis weight portion 44" includes a case where the high basis weight portion 43 near the boundary between the low basis weight portion 44 and the high basis weight portion 43 forms a part of the concave portion, and similarly, " The convex portion is mainly formed by the high basis weight portion 43" means that the low basis weight portion 44 near the boundary between the high basis weight portion 43 and the low basis weight portion 44 forms a part of the convex portion. In addition, the direction in which the indicator 5 extends is a direction in which the diaper 1 extends in the longitudinal direction as shown in FIG. 1, and is the same direction as the direction parallel to the center line CL (Y direction).

As described above, as shown in FIG. 2, the absorbent core 41 is formed above the indicator 5 and has a concave-convex structure on the side of the back sheet 3 opposed to the indicator 5. In other words, as shown in FIG. 1, the side surface 3 of the absorbent core 41 facing the indicator 5 is alternately arranged in the longitudinal direction (Y direction) in a line extending in the lateral direction (X direction). The low basis weight portion 44X and the high basis weight portion 43 form a concavo-convex structure.

Further, as shown in FIG. 2, the low basis weight portion 44 of the absorbent core 41 is biased toward the front sheet 2 side (the skin facing surface side of the absorbent body 4) in the thickness direction T of the diaper 1. As shown in Fig. 2, the side of the front sheet 2 of the absorbent core 41 is flat.

The plan view (FIG. 7) obtained by observing the absorbent core 41 of the diaper 1 from the side of the back sheet 3 will describe the uneven structure of the absorbent core 41 in more detail.

In the diaper 1, as shown in Fig. 7, the high basis weight portion 43 is divided by a low basis weight portion 44X extending in the lateral direction (X direction) and a low basis weight portion 44Y extending in the longitudinal direction (Y direction). In the horizontal direction (X direction), seven block-shaped concavo-convex structures are arranged in the vertical direction (Y direction) from the front side A and the back side B to form a square shape region 411. In the square-shaped region 411 of the diaper 1, as shown in Fig. 7, eight low basis weight portions 44Y extending in the longitudinal direction (Y direction) are respectively spanned from the abdominal side A and the back side B. The configuration is linear.

When the absorbent core 41 is used in a disposable diaper, the total length in the longitudinal direction (Y direction) is preferably 250 mm or more and 550 mm or less, and the total width in the lateral direction (X direction) is 50 mm or more and 200 mm. the following.

In the absorbent core 41 of the diaper 1, as shown in Fig. 1, the low basis weight portion 44 (44X) is used in view of the judgment of the amount of water in the urine or soft stool and the specificity of the excretion position. The average length of the direction in which the indicator 5 extends (Y direction) is shorter than the average length of the high basis weight portion 43 in the direction in which the indicator extends (Y direction). Specifically, in the absorbent core 41, the average length (L1) of the linear low base portion 44X extending in the lateral direction (X direction) in the direction in which the indicator 5 extends (Y direction) is shorter than the high base. The average length (L3) of the weight 43 in the direction in which the indicator extends (Y direction). In order to exhibit the above effects, the average length (L1) of the low basis weight portion 44 (44X) is 3% or more, preferably 5% or more, of the average length (L3) of the high basis weight portion 43. The length is 20% or less, preferably 15% or less, and more specifically, preferably 3% or more and 20% or less, and more preferably 5% or more and 15% or less. Here, the "average length" means an average value of the measured lengths measured at five different sites.

Hereinafter, the dimensions, basis weight, and the like of the high basis weight portion 43 and the low basis weight portion 44 (44X) will be described in more detail.

In the case where the absorbent article is used in, for example, a disposable diaper, the shape of the absorbent core 41 is not broken by the wearer's activity, and the area of the indicator which causes discoloration due to a small amount of moisture is limited to the indicator. From the viewpoint of one of the portions 5, the width L1 of the linear low basis weight portion 44X extending in the lateral direction (X direction) is 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 3 Mm or less, more specifically, it is preferably 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 3 mm or less.

Further, the width L1 is a measured value at the position of the bottom of the concave portion in the uneven structure of the absorbent core 41.

In the diaper 1, as shown in FIG. 1, the high basis weight portion 43 is formed in a rectangular shape that is long in the longitudinal direction (Y direction) in plan view. Further, in the diaper 1, when the high basis weight portion 43 is viewed from above, it is formed in a rectangular shape, but the four corners may be formed in an arc shape, or may be a polygonal shape, an ellipse, a combination thereof, or the like.

As the high basis weight portion 43 of the diaper 1, when the absorbent article is used in, for example, a disposable diaper, the indicator portion which is discolored by a small amount of moisture is appropriately dispersed in the entire region of the indicator 5, so that it can be easily From the viewpoint of discoloration due to a small amount of water, as shown in Fig. 1, the length L3 in the longitudinal direction (Y direction) is 5 mm or more, preferably 15 mm or more, and 30 mm or less. Preferably, it is 25 mm or less, and more specifically, it is preferably 5 mm or more and 30 mm or less, and more preferably 15 mm or more and 25 mm or less.

In the case where the absorbent article is used in, for example, a disposable diaper, the basis weight of the low basis weight portion 44 (44X) is high from the viewpoint of easily forming a space for making a small amount of moisture easily contact with the indicator 5. The basis weight of the basis weight portion 43 is 20% or more, preferably 30% or more, and 80% or less, preferably 70% or less, and more specifically, preferably 20% or more and 80% or less, and further preferably It is 30% or more and 70% or less.

Specifically, the basis weight of the low basis weight portion 44 (44X) is 100 g/m ² or more, preferably 150 g/m ² or more, and is 500 g/m ² or less, preferably 400 g/m ^{2 .} Hereinafter, more specifically, it 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. Further, the basis weight of the high basis weight portion 43 is 300 g/m ² or more, preferably 350 g/m ² or more, and 900 g/m ² or less, preferably 800 g/m ² or less, more specifically In other words, it is preferably 300 g/m ² or more and 900 g/m ² or less, and more preferably 350 g/m ² or more and 800 g/m ² or less.

Further, the thickness of the low basis weight portion 44 (44X) is preferably 30% or more and 90% or less of the thickness of the high basis weight portion 43. Specifically, the thickness of the low basis weight portion 44 (44X) is 1.5 mm or more, preferably 2.5 mm or more, and 4.5 mm or less, preferably 4.0 mm or less. More specifically, it is preferably 1.5 mm or more and 4.5 mm or less, and more preferably 2.5 mm or more and 4.0 mm or less. The thickness of the high basis weight portion 43 is 2 mm or more, preferably 3 mm or more, and 8 mm or less, preferably 7 mm or less, and more specifically, preferably 2 mm or more and 8 mm or less, and further preferably It is 3 mm or more and 7 mm or less.

Further, the thickness was cut into a specific size, and the measurement site was pressurized at 5 kPa for 10 minutes, and immediately after the weight removal was performed. The measurement site is set to include one or more of the ventral portion, the intercondylar portion, and the dorsal portion, and the thickness of each of the two diaper samples (the measurement portion is six or more). . The thickness of the high basis weight portion 43 and the low basis weight portion 44 (44X) is determined by cutting the diaper 1 in the longitudinal direction (Y direction) or the lateral direction (X direction) as shown in FIG. 1 by, for example, using a sharp razor. The profile of the broken sample. The thickness of the high basis weight portion 43 is measured at the position of the thickest portion of the convex portion, and the thickness of the low basis weight portion 44 (44X) is measured at the position of the thinnest portion of the concave portion. When it is difficult to measure by the naked eye, for example, a cross section of the cut sample can be observed and measured at a magnification of 20 to 100 times using a microscope (VHX-1000 manufactured by Keyence Corporation).

The basis weights of the high basis weight portion 43 and the low basis weight portion 44 are measured as follows.

<Method for measuring basis weight>

The method of measuring the basis weight of the high basis weight portion 43 and the low basis weight portion 44 is as follows.

A single-edged razor manufactured by FEATHER Co., Ltd. was cut along the boundary line between the high basis weight portion 43 and the low basis weight portion 44 of the absorbent core 41. Ten pieces of the high basis weight portion 43 obtained by cutting were measured using an electronic balance (electronic balance GR-300 manufactured by A & D Co., Ltd., accuracy: four decimal places), and one of the high basis weight portions 43 was obtained. The average weight of the small pieces. The basis weight of the high basis weight portion 43 is calculated by dividing the obtained average weight by the average area of each of the small pieces of the high basis weight portion 43.

Next, along the boundary line extending in the lateral direction (X direction) between the high basis weight portion 43 and the low basis weight portion 44 (44X), the width is 100 mm and the width is the width of the low basis weight portion 44 (44X). The dimensions were designed using a single-edged razor manufactured by FEATHER and cut into 5 small pieces of a thin strip-shaped low basis weight 44 (44X). For the five small pieces obtained, the electronic balance (electronic balance GR-300 manufactured by A & D Co., Ltd., accuracy: 4 digits after the decimal point) was used for measurement, and averaged to obtain a low basis weight portion 44 (44X). The average weight of one piece. The basis weight of the low basis weight portion 41 (44X) was calculated by dividing the obtained average weight by the average area of each of the small pieces of the low basis weight portion 44 (44X).

In the absorbent core 41 of the diaper 1, the high basis weight portion 43 is formed to have substantially the same density or high density as the low basis weight portion 44 (44X, 44Y).

In the case where the absorbent article is used in, for example, a disposable diaper, the shape of the absorbent core 41 is not broken by the wearer's activity, and the diffusibility of moisture is increased to make a small amount of moisture easily contact with the indicator 5. In view of the above, the density of the low basis weight portion 44 (44X, 44Y) is 50% or more, preferably 75% or more, and 100% or less, preferably 95% or less, of the density of the high basis weight portion 43. More specifically, it is preferably 50% or more and 100% or less, and more preferably 75% or more and 95% or less.

Specifically, the density of the low basis weight portion 44 (44X, 44Y) is 0.05 g/cm ³ or more, preferably 0.07 g/cm ³ or more, and 0.15 g/cm ³ or less, preferably 0.13 g/cm. ³ or less, more specifically, it is preferably 0.05 g/cm ³ or more and 0.15 g/cm ³ or less, and more preferably 0.07 g/cm ³ or more and 0.13 g/cm ³ or less. Further, the density of the high basis weight portion 43 is 0.05 g/cm ³ or more, preferably 0.07 g/cm ³ or more, and 0.15 g/cm ³ or less, preferably 0.13 g/cm ³ or less, more specifically It is preferably 0.05 g/cm ³ or more and 0.15 g/cm ³ or less, and more preferably 0.07 g/cm ³ or more and 0.13 g/cm ³ or less.

The density of the high basis weight portion 43 and the low basis weight portion 44 (44X, 44Y) is obtained by dividing the basis weights of the high basis weight portion 43 and the low density portion 44 obtained by the above method by the above method. Calculated by the thickness of the person.

Further, in the diaper 1, a space 9 is formed between the low basis weight portion 44 (44X, 44Y) of the absorbent core 41 and the covering member 42. That is, the absorber 4 is formed with an absorbent core The concavo-convex structure of the body 41 and the space 9 formed by coating the covering material 42 of the absorbent core 41. As described above, in the diaper 1, as shown in Figs. 1 and 2, the low basis weight portions 44 (44X, 44Y) are integrally formed in a lattice shape on the side of the back sheet 3 of the absorbent core 41, in the lattice eye. A high basis weight portion 43 is disposed at a position, and the low basis weight portion 44 is formed to surround the high basis weight portion 43. Therefore, in the diaper 1, as shown in Figs. 1 and 2, the plurality of spaces 9X formed by the low basis weight portion 44X recessed toward the front sheet 2 side and the covering member 42 correspond to the low basis weight portion 44X, respectively. The horizontal direction (X direction) is continuously extended, and the plurality of spaces 9Y formed by the low basis weight portion 44Y recessed toward the front sheet 2 side and the covering member 42 correspond to the low basis weight portion 44Y, respectively, in the longitudinal direction (Y direction). Extend continuously.

As described above, in the present invention, between the back sheet 3 and the absorber 4, the indicator 5 which is instructed to be excreted by the change in color is continuously arranged in the longitudinal direction (Y direction). In the diaper 1, as shown in FIG. 2, the indicator 5 is disposed between the covering material 42 of the absorber 4 and the back sheet 3, and is disposed on the skin facing surface of the back sheet 3. The change in the color of the indicator 5 can be visually recognized from the outside via the back sheet 3. In the horizontal direction (X direction), the indicator 5 of the diaper 1 is disposed at a central portion in the lateral direction (X direction) including the center line CL when the diaper 1 is viewed in section as shown in FIG. 2 . Further, the indicator 5 of the diaper 1 is arranged linearly along the center line CL across the lower crotch portion C to the back side portion A and the lower crotch portion B in the longitudinal direction (Y direction). In the diaper 1, the indicator 5 is arranged such that three elongated lines are arranged at equal intervals in the lateral direction (X direction), but they may be formed by one or a plurality of lines. In addition, the indicator 5 of the diaper 1 is arranged linearly in the longitudinal direction (Y direction) across the crotch portion C to the abdominal side portion A and the back side portion B, but at least it is disposed in the crotch portion C. It may be formed over the entire length of the absorbent core 41 in the Y direction.

The width W1 of the indicator 5 (in the present embodiment, the total width of the three indicators) even when the wearer has a high visibility from the gap of the clothes, and does not hinder the design of the back sheet. ) is 2 mm or more, preferably 3 mm or more, and 10 mm or less, preferably 8 mm or less, and more specifically, preferably 2 mm or more and 10 It is preferably not more than 3 mm and not more than 8 mm and not more than 8 mm.

Further, as described above, as shown in FIG. 2, the covering member 42 of the diaper 1 forms the overlapping portion 420 in which the side edge portions of the covering member 42 overlap each other on the back sheet 3 side of the absorbent core 41 to coat the absorbent core. Body 41. The overlapping portion 420 extends on the indicator 5 in the direction in which the indicator 5 extends (Y direction). The overlapping portion 420 is formed on the indicator 5 along the center line CL over the entire length of the absorber 4 in the longitudinal direction (Y direction). Further, the width W2 in the lateral direction (X direction) of the overlapping portion 420 is preferably the same as or wider than the width W1 of the indicator 5, and is absorbing the excess moisture of the excrement located near the indicator 5, The ratio (W2/W1) of the width W2 of the overlapping portion 420 to the width W1 of the indicator 5 is 1.0 or more, preferably 1.5 or more, and 3.0 or less, preferably 2.5 or less, and more specifically, preferably 1.0 or more and 3.0 or less, further preferably 1.5 or more and 2.5 or less. Specifically, the width W2 of the overlapping portion 420 is 5 mm or more, preferably 10 mm or more, and 30 mm or less, preferably 25 mm or less, and more specifically, preferably 5 mm or more and 30 mm or less. Further preferably, it is 10 mm or more and 25 mm or less.

Next, a method of manufacturing the absorbent body 4 including the absorbent body 4 included in the diaper 1, that is, the absorbent core 41 including the high basis weight portion 43 (high density) and the low basis weight portion 44 (low density) Be explained.

Fig. 4 shows an embodiment of the manufacturing method of the absorbent body 4 and a manufacturing apparatus used therefor. The manufacturing apparatus of the absorber 4 includes a rotary cylinder 50 which is rotationally driven in the direction of the arrow R1, and a duct 60 which supplies the absorbent polymer 45 containing the absorbent polymer as a raw material of the absorbent core 41 to the rotary cylinder 50. The outer peripheral surface; the transfer roller 70 disposed obliquely below the downstream side of the rotary cylinder 50 and rotationally driven in the direction of the arrow R2; the vacuum box 65 disposed in the circumferential direction of the rotary cylinder 50 and the material Between the rollers 70; a mesh belt 75 as a gas permeable member, which is disposed between the vacuum box 65 and the rotary cylinder 50 and between the transfer roller 70 and the rotary cylinder 50; and the vacuum conveyor 80 It is disposed below the transfer roller 70.

As shown in Fig. 4, the rotary cylinder 50 is formed in a cylindrical shape and receives power from a prime mover such as a motor so that a member forming an outer peripheral surface thereof rotates about a horizontal axis. A non-rotating portion on the inner side (rotational axis side) of the rotary cylinder 50 is formed with a space 56 for decompressing the inside. A known exhaust device (not shown) such as an intake fan is connected to the space 56, and the inside of the space 56 can be maintained at a negative pressure by the operation of the exhaust device. On the other hand, in the spaces 57 and 58 on the inner side (rotational axis side) of the rotary cylinder 50, a pipe (not shown) for air outside the suction device is connected.

As shown in FIG. 4, on the outer peripheral surface of the rotary cylinder 50, a plurality of cylindrical recesses 51 having shapes corresponding to the shape of the absorbent core 41 to be produced are formed at equal intervals in the R1 direction. As shown in FIG. 5, a mesh plate 52 in which a plurality of micropores are formed, and a gas-impermeable member 53 made of metal or resin are disposed on the bottom surface portion of each of the cylindrical recesses 51. Here, the gas-impermeable member 53 is provided so as to protrude from the mesh plate 52, and is disposed to correspond to the shape and position of the low basis weight portions 44 (44X, 44Y). As shown in FIG. 5, only the region 54 of the stencil 52 divided by the gas permeable member 53 disposed in the above manner becomes a portion corresponding to the high basis weight portion 43. Moreover, the outer peripheral surface of the rotating cylinder 50 in which the cylindrical recessed part 51 is not formed has the frame of the rotating cylinder 50 containing the metal rigid body, and it is non-gas permeability.

As shown in Fig. 4, one end side of the duct 60 covers the outer peripheral surface of the rotating cylinder 50 in the space 56 maintained in the negative pressure, and has a fiber material introducing means on the other end side (not shown). The fiber material introduction device includes, for example, a pulverizer that pulverizes the sheet-like wood pulp as a woven pulp, and feeds the woven pulp (fiber material) into the catheter, and includes introduction in the middle of the catheter 60. The absorbent polymer introduction portion of the absorbent polymer.

The transfer roller 70 includes a cylindrical outer peripheral portion having a gas permeability and is driven by a prime mover such as a motor so that its outer peripheral portion rotates in the R2 direction. A non-rotating portion on the inner side (rotational axis side) of the transfer roller 70 is formed with a space 71 for decompressing the inside. A well-known exhaust device (not shown) such as an intake fan is connected to the space 71, and by operating the exhaust device, the space 71 can be maintained at a negative pressure.

The vacuum box 65 is disposed in the rotation direction R1 of the rotary cylinder 50, and is disposed between the downstream end portion 601 of the duct 60 and the transfer roller 70. The vacuum box 65 has a box shape and has an opening that opens in the direction of the rotating cylinder 50 at a portion facing the rotating cylinder 50. The vacuum box 65 is connected to a known exhaust device (not shown) such as an intake fan via an exhaust pipe 67, and the inside of the vacuum box 65 can be maintained at a negative pressure by the operation of the exhaust device.

The mesh belt 75 is formed by connecting a belt-shaped gas permeable belt having a mesh shape into a ring shape, and is guided by a plurality of free rollers and a transfer roller 70 to continuously move on a specific path. The mesh belt 75 is driven by the rotation of the transfer roller 70. The mesh belt 75 is in contact with the outer peripheral surface of the rotary cylinder 50 while passing through the opening of the vacuum chamber 65, and is adjacent to the outermost portion of the transfer cylinder 70 closest to the rotary cylinder 50, and is surrounded by the outer circumference of the rotary cylinder 50. The surface is separated and transferred to the transfer roller 70.

The vacuum conveyor 80 includes an annular gas permeable belt 83 that is stretched over the driving roller 81 and the driven roller 82, and a vacuum box 84 that is disposed at a position opposed to the conveying roller 70 with the gas permeable belt 83 interposed therebetween. .

Next, a method of continuously manufacturing the absorbent body 4 (absorbent core 41) using the above-described manufacturing apparatus of the absorbent body will be described.

First, the space 56 connected to the inside of the rotary cylinder 50 and the exhaust device in the vacuum chamber 65 are actuated to make the space 56 in the rotary cylinder 50 and the inside of the vacuum chamber 65 a negative pressure. This is because the airflow in the space 56 is negatively generated in this manner, and the airflow that transports the absorbent material 45 to the outer peripheral surface of the rotary cylinder 50 is generated in the duct 60. Next, the rotary cylinder 50 and the transfer roller 70 are rotated, and the vacuum conveyor 80 is operated. Then, when the fibrous material introduction device is operated to supply the fibrous material to the catheter 60 and further supply the absorbing polymer, the absorbent material 45 becomes scattered in accordance with the flow of air flowing in the catheter 60, and It is supplied to the outer peripheral surface of the rotary cylinder 50.

While the portion covered by the duct 60 is being conveyed, the absorbent material (mixture of the fiber material and the absorbing polymer) 45 is sucked to the cylindrical recess 51 of the rotary cylinder 50. As shown in Figure 6 It is shown that the absorbent material 45 is gradually deposited on the screen 52 of each of the regions 54 of the cylindrical recess 51. In the deposit 46 obtained in this manner, the amount of the absorbent material 45 deposited on the portion (the corresponding portion of the gas-impermeable member 53) 46a in which the absorbent material 45 is deposited on the gas-impermeable member 53 is relatively small, and the like. The amount of deposition of the absorbent material 45 in the portion (region 54 corresponding portion) 46b is relatively large, and the deposit 46 as a whole has a concavo-convex structure.

When the rotating cylinder 50 rotates and the cylindrical recess 51 reaches the opposite position of the vacuum box 65, the deposit 46 in the cylindrical recess 51 is sucked onto the mesh belt 75 by suction from the vacuum box 65. The deposit 46 in the cylindrical recess 51 is conveyed to the front side of the closest portion of the transfer roller 70 and the rotary cylinder 50 in this state, and in the vicinity of the closest portion, by suction from the transfer roller 70 side, On the other hand, the film is released from the cylinder recess 51 in a state of being adsorbed on the mesh belt 75, and is transferred to the transfer roller 70.

Thus, the deposit 46 having the uneven structure transferred to the transfer roller 70 together with the mesh belt 75 is conveyed to the vacuum conveyor 80 in a state of being adsorbed on the mesh belt 75 on the transfer roller 70. The portion (the lowermost end portion of the transfer roller 70) is transferred to the vacuum conveyor 80 by the suction of the vacuum box 84 at the delivery portion.

In the manufacturing apparatus of the absorbent body of the present embodiment, as shown in FIG. 4, the covering material 42 including the toilet paper or the hydrophilic non-woven fabric is introduced onto the vacuum conveyor 80 before the deposit 46 is placed, and the deposit 46 is placed. Transfer to the covering material 42. Further, the covering material 42 is folded by a folding plate (not shown), and the deposit 46 is covered with the covering material 42, and the deposit 46 in a state covered with the covering material 42 is cut at a predetermined interval, and is continuously continuous. An absorbent body precursor 49 cut into a size of one absorbent body is produced.

Further, in the apparatus for manufacturing an absorbent body according to the present embodiment, the absorbent body precursor 49 obtained in this manner is compressed by the pressurizing mechanism 90, and the thickness of the deposit 46 constituting the absorbent core precursor 49 is made. The target body 4 (absorbent core 41) is actively reduced to obtain the target. As shown in FIG. 4, the pressurizing mechanism 90 is configured to include at least one surface smoothing pair of rollers 91, 92, and can press the upper and lower sides of the pressed object introduced between the rollers 91, 92. The surface is pressurized and compressed in the thickness direction.

When the deposit 46 is compressed by the pressurizing mechanism 90, the portion where the absorbent material is relatively large and the portion having a large thickness (the portion corresponding to the region 54) 46b is relatively less than the portion of the absorbent material 45 and the thickness is small (the air is hard to breathe) The corresponding portion 46a of the member 53 is subjected to stronger compression. As a result, in the absorbent body 4 (absorbent core 41) manufactured by the above-described manufacturing apparatus, the portion (region 54 corresponding portion) 46b (convex portion) of the deposit 46 becomes a relatively high density in the absorbent core 41. The high basis weight portion 43 and the portion (the portion corresponding to the gas-impermeable member 53) 46a (concave portion) of the deposit 46 become the low basis weight portion 44 of the absorbent core 41 having a relatively low density.

The front sheet 2 of the diaper 1 and the absorbent body 4, and the absorber 4 and the back sheet 3 are fixed to each other by an adhesive (hot melt adhesive or the like) applied in a pattern such as dots, spirals, or stripes. .

In particular, between the absorber 4 and the back sheet 3, in the diaper 1, as shown in FIG. 2, the absorber 4 is externally attached to the back sheet via the adhesive 10 in the lateral direction (X direction) of the indicator 5. The material 3 is fixed and is not fixed to the back sheet 3 in the region of the indicator 5. That is, as shown in FIG. 2, the covering material 42 of the absorber 4 and the back surface sheet 3 are not fixed in the area of the indicator 5, and only the outer side disposed in the lateral direction (X direction) of the indicator 5 is provided. It is fixed by the adhesive 10 extending in the longitudinal direction (Y direction).

The material for forming the disposable diaper 1 of the present embodiment will be described.

The front sheet 2, the back sheet 3, and the three-dimensional pleat forming sheet 62 are usually used without any particular limitation as long as they can be used in an absorbent article such as a disposable diaper. For example, as the front sheet 2, a liquid permeable non-woven fabric, a perforated film, a laminated body or the like can be used, and as the back sheet 3, a resin film, a laminate of a resin film and a non-woven fabric, or the like can be used. As the three-dimensional pleat forming sheet 62, a stretchable film, a nonwoven fabric, a woven fabric, or the like can be used.

The adhesive tape 7 is usually used without any particular limitation as long as it can be used in an absorbent article such as a disposable diaper. For example, "Magic Tape (registered trademark)" can be used. (Hooks made by Kuraray Co., Ltd.), "Quicklon (registered trademark)" (manufactured by YKK), "Magi Cloth (registered trademark)" (manufactured by Kanebo Bell Touch Co., Ltd.), etc.

The absorbent core 41 constituting the absorbent body 4 can be obtained by holding particles of the absorbent polymer in an aggregate of fibers such as pulp fibers. As the covering material 42 constituting the absorber 4, a hydrophilic sheet, for example, a coated sheet material including a water-permeable tissue (toilet paper) or a water-permeable nonwoven fabric can be used.

As the elastic member 61 for forming the three-dimensional pleats, the leg elastic member 63, and the waist elastic member 64, natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene can be used. a filamentous stretchable material such as a polybutadiene copolymer or a polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene.

The indicator 5 is usually used without any particular limitation as long as it can be used in an absorbent article such as a disposable diaper. For example, a colored material which is colored, discolored or achromatic by contact with excrement can be directly applied to a sheet such as another film or nonwoven fabric different from the back sheet 3, or a back sheet 3. For example, as the colored material, a mixture of a pH indicator and an oxidizing compound or the like can be used.

The effect of the disposable diaper 1 of the embodiment of the present invention described above will be described.

As shown in FIG. 1 and FIG. 2, the absorbent core 41 of the diaper 1 has a concavo-convex structure formed on the side of the back sheet 3 to which the indicator 5 is provided. In other words, on the side of the back sheet 3 facing the indicator 5, the high basis weight portion 43 and the low basis weight portion 44 on which the absorbent core 41 is formed are alternately arranged in the direction in which the indicator 5 extends (Y direction). Concave structure. Therefore, the indicator 5 can be easily discolored. Further, as shown in FIG. 3, the diaper 1 is formed with a space 9 between the concave portion of the low basis weight portion 44 of the absorbent core 41 and the covering member 42, and the low basis weight portion 44 is in contact with the space 9. Therefore, when the wearer discharges the excrement during the wearing of the diaper 1, even if the moisture of the excrement is small, the moisture can easily reach through the space portion 9. The indicator 5 is such that the indicator 5 is easily discolored. Since the indicator 5 is easily discolored as described above, it is possible to satisfy the need to change the diaper when the excrement is small. Further, in the diaper 1, since the high basis weight portion 43 and the low basis weight portion 44 are alternately arranged in the direction in which the indicator 5 extends (Y direction), a plurality of spaces formed at positions corresponding to the low basis weight portion 44 are provided. 9 is intermittently formed in the direction in which the indicator 5 extends (Y direction). Therefore, the indicator 5 can be easily discolored by the transfer of the moisture of the excrement, and it is easy to visually recognize which side of the abdominal side A and the back side B the discoloration of the indicator 5 starts. When it is possible to visually recognize which side of the front side A and the back side B is discolored, it is presumed that it is urine when discoloration starts from the side of the abdominal side A, and it is soft when it starts discoloring from the side of the back side B.

Further, as shown in FIGS. 2 and 3, the overlapping portion 420 of the hydrophilic covering member 42 covering the absorbent core 41 of the diaper 1 extends in the direction (Y direction) in which the indicator 5 extends and extends on the indicator 5. . Therefore, the overlapping portion 420 can absorb the excess moisture of the excrement, and it is possible to prevent erroneous determination of the amount of urine caused by the expansion of the discolored portion of the indicator 5 due to the excessive moisture diffusion.

Further, as shown in Fig. 2, the absorbent body 4 of the diaper 1 is fixed to the back sheet 3 via the adhesive 10 in the lateral direction (X direction) of the indicator 5, and is not in the region of the indicator 5. The back sheet 3 is fixed. Therefore, since the contact agent 5 does not interfere with the contact of moisture due to the adhesive 10, the effect of the function of indicating that the indicator 5 is discolored by a smaller amount of water is exhibited.

The disposable diaper according to one embodiment of the absorbent article of the present invention is not limited to any of the disposable diapers of the above embodiment, and can be appropriately changed.

For example, in the disposable diaper 1 of the above-described embodiment, as shown in FIG. 1, the indicator 5 continuously extends in the direction (Y direction) parallel to the center line CL, but it is only necessary to continuously extend in the longitudinal direction. That is, the indicator 5 may extend obliquely obliquely in the longitudinal direction or may extend in a curved shape in the longitudinal direction.

Moreover, in the disposable diaper 1 of the above embodiment, as shown in Fig. 1, it constitutes a suction. The low basis weight portion 44 of the absorbent core 41 of the body 4 is formed by a linear low base portion 44X extending in the lateral direction (X direction) and a linear low base extending in the longitudinal direction (Y direction). The heavy portion 44Y is formed in a lattice shape as a whole, but is not limited to the lattice shape.

Further, in the disposable diaper 1 of the above-described embodiment, as shown in Figs. 1 and 7, the absorbent core 41 of the absorbent body 4 has a rectangular block-shaped region 411 which is long in the longitudinal direction (Y direction). However, the absorbent cores 41A to 41C shown in FIGS. 8 to 10 may be included instead of the absorbent core 41. The absorbent cores 41A to 41C shown in Figs. 8 to 10 will be described in detail with respect to the absorbent core 41 included in the diaper 1 as described above, unless otherwise specified. In FIGS. 8 to 10, the same members as those in FIGS. 1 and 7 are denoted by the same reference numerals. Each of the absorptive cores 41A to 41C shown in FIGS. 8 to 10 further has a non-block region 412 disposed over the outer circumference of the block-shaped region 411. The absorbent cores 41A to 41C shown in FIGS. 8 to 10 are respectively laterally opposite to the both side edges of the abdominal side portion A and the side edges of the back side portion B, respectively. The outer side is extended in the X direction, and has a square-shaped region 411 formed in a shape in which the central portion in the longitudinal direction (Y direction) is tapered inward, and has a central portion formed in the longitudinal direction (Y direction). A non-squared area 412 of fine shapes.

The square-shaped region 411 of the absorbent core 41A shown in Fig. 8 will be more specifically described. In the absorptive core 41A, as shown in FIG. 8, the back side portion 411b of the square-shaped region 411 is formed in such a manner that the low basis weight portion 44X extending in the lateral direction (X direction) and the longitudinal direction (Y) The high basis weight portion 43 divided by the low basis weight portion 44Y extending in the direction is regularly arranged in the horizontal direction (X direction), and four rows of irregularities are regularly arranged in the vertical direction (Y direction). Further, as shown in Fig. 8, the lower portion 411c of the square-shaped region 411 is formed by a low basis weight portion 44X extending in the lateral direction (X direction) and a low base extending in the longitudinal direction (Y direction). The high basis weight portion 43 divided by the weight portion 44Y is regularly arranged in the horizontal direction (X direction), and three rows of irregularities are regularly arranged in the vertical direction (Y direction). Further, as shown in FIG. 8, the ventral portion 411a of the square-shaped region 411 is Formed in such a manner that the high basis weight portion 43 divided by the low basis weight portion 44X extending in the lateral direction (X direction) and the low basis weight portion 44Y extending in the longitudinal direction (Y direction) is regularly in the lateral direction (X direction) Four columns are arranged in the vertical direction (Y direction) in a regular arrangement of four concavities and convexities. In the square-shaped region 411 of the absorbent core 41B, as shown in FIG. 8, any low basis weight portion 44Y extending in the longitudinal direction (Y direction) is not disposed from the abdominal side portion A and the back side portion B. Straight.

The square-shaped region 411 of the absorbent core 41B shown in Fig. 9 will be more specifically described. In the absorptive core 41B, as shown in FIG. 9, the back side portion 411b of the square-shaped region 411 is formed in such a manner that the low basis weight portion 44X extending in the lateral direction (X direction) and the longitudinal direction (Y) The high basis weight portion 43 divided by the low basis weight portion 44Y extending in the direction is regularly arranged in the horizontal direction (X direction), and five irregularities are arranged in the vertical direction (Y direction). The portion 43 is regularly arranged in the horizontal direction (X direction) in a row in which the four concavities and convexities are regularly arranged in the vertical direction (Y direction). Further, as shown in Fig. 9, the lower portion 411c of the square-shaped region 411 is formed by a low basis weight portion 44X extending in the lateral direction (X direction) and a low base extending in the longitudinal direction (Y direction). The high basis weight portion 43 divided by the weight portion 44Y is regularly arranged in the horizontal direction (X direction), and three rows of irregularities are regularly arranged in the vertical direction (Y direction). Further, as shown in Fig. 9, the front side portion 411a of the square-shaped region 411 is formed by a low basis weight portion 44X extending in the lateral direction (X direction) and a low base portion extending in the longitudinal direction (Y direction). The high basis weight portion 43 divided by the weight portion 44Y is regularly arranged in the horizontal direction (X direction), and four irregularities are arranged in the vertical direction (Y direction), and the high basis weight portion 43 is regularly arranged in the horizontal direction. In the direction (X direction), five columns of irregularities are arranged, and three columns are arranged in the vertical direction (Y direction). In the square-shaped region 411 of the absorbent core 41B, as shown in FIG. 9, any low basis weight portion 44Y extending in the longitudinal direction (Y direction) is not disposed from the abdominal side portion A and the back side portion B. Straight.

The square shape region 411 of the absorbent core 41C shown in Fig. 10 is more specifically advanced. Line description. In the absorptive core 41C, as shown in FIG. 10, the back side portion 411b of the square-shaped region 411 is formed by a low basis weight portion 44X extending in the lateral direction (X direction) and in the longitudinal direction (Y). The high basis weight portion 43 divided by the low basis weight portion 44Y extending in the direction is regularly arranged in the horizontal direction (X direction), and the six irregularities are arranged in the vertical direction (Y direction). The portion 43 is regularly arranged in the horizontal direction (X direction) in a row in which the four concavities and convexities are regularly arranged in the vertical direction (Y direction). Further, as shown in FIG. 10, the lower portion 411c of the square-shaped region 411 is formed by a low basis weight portion 44X extending in the lateral direction (X direction) and a low base extending in the longitudinal direction (Y direction). The high basis weight portion 43 divided by the weight portion 44Y is regularly arranged in the horizontal direction (X direction), and two rows of irregularities are regularly arranged in the vertical direction (Y direction). Further, as shown in FIG. 10, the front side portion 411a of the square-shaped region 411 is formed by a low basis weight portion 44X extending in the lateral direction (X direction) and a low base extending in the longitudinal direction (Y direction). The high basis weight portion 43 divided by the weight portion 44Y is regularly arranged in the horizontal direction (X direction), and four irregularities are arranged in the vertical direction (Y direction), and the high basis weight portion 43 is regularly arranged in the horizontal direction. In the direction (X direction), six columns of irregularities are arranged in a regular manner, and three columns are arranged in the vertical direction (Y direction). In the square-shaped region 411 of the absorbent core 41C, as shown in FIG. 10, three of the seven low basis weight portions 44Y extending in the longitudinal direction (Y direction) are respectively spanned from the abdominal side A and the back side B. And configured in a straight line.

Further, as shown in Fig. 1, the disposable diaper 1 of the above embodiment is an unfolded disposable diaper, but may be a pant-type disposable diaper.

Regarding the above embodiment, the following absorbent article is further disclosed.

<1> An absorbent article comprising: a front sheet disposed on the opposite side of the skin; a back sheet disposed on the non-skin facing surface side; and an elongated absorbent body disposed between the two sheets Between the back sheet and the absorber, an indicator that is instructed to be excreted by a change in color is continuously disposed in the longitudinal direction; the absorber has an absorbent core including an absorbent polymer. In the above absorbent core, the base weight is relatively high, and the high basis weight that protrudes toward the back sheet side is adjacent to the high basis weight, and the basis weight is relatively low, and the side surface is laterally oriented from the back sheet. The low basis weight recessed on the side of the front sheet is alternately formed in the longitudinal direction, and the high basis weight is integrally formed with the low basis weight, and the high side is formed on the side of the back sheet to which the indicator is provided The base weight portion and the low basis weight portion are alternately arranged in a direction in which the indicator extends.

The absorbent article according to the above <1>, wherein the absorbent core is coated with a covering material between the low basis weight portion of the absorbent core and the covering material on the back sheet side. There is space for formation.

<3> The absorbent article according to the above <1>, wherein the average length of the low basis weight in the direction in which the indicator extends is shorter than the high basis weight portion extending from the indicator in a plan view. The average length of the direction.

<4> The absorbent article according to the above <3>, wherein the average length of the low basis weight portion is 3% or more and 20% or less of the average length of the high basis weight portion.

The absorbent article according to any one of the above aspects, wherein the basis weight of the low basis weight portion is a basis weight of 20% or more and 80% or less of the basis weight of the high basis weight portion.

The absorbent article according to any one of the above aspects, wherein the covering material is a hydrophilic sheet, and the covering material is formed on the back sheet side of the absorbent core. The absorbing portion is covered by an overlapping portion where the side edges of the material overlap each other, and the overlapping portion extends over the indicator along a direction in which the indicator extends.

The absorbent article according to any one of the above aspects, wherein the absorption system is fixed to the back sheet via an adhesive in the lateral direction of the indicator, and the indication is The area of the agent is not fixed to the back sheet.

The absorbent article according to any one of the above-mentioned items, wherein the left and right side edges of the abdominal side portion and the left and right side edges of the back side portion of the absorbent article are respectively lower than the lower jaw The left and right side edges of the portion project outward in the lateral direction, and the left and right side edges of the lower jaw portion are curved inwardly in a convex shape in the lateral direction, and have a shape in which the central portion in the longitudinal direction is tapered inwardly. The front sheet and the back sheet respectively protrude outward from the left and right side edges and the front and rear end edges of the absorber, and the dimension of the front sheet in the lateral direction is smaller than the dimension of the back sheet in the lateral direction.

The absorbent article according to any one of the above aspects, wherein the absorbent system covers the liquid retaining property in the longitudinal direction by the covering material which is a liquid-permeable hydrophilic sheet. Formed by an absorbent core.

The absorbent article according to any one of the above aspects, wherein the low basis weight of the absorbent core is biased toward the front sheet side in a thickness direction of the absorbent article, And the side of the front sheet is flat.

The absorbent article according to any one of the above aspects, wherein the average length of the low basis weight portion in the longitudinal direction is 5% or more and 15% or less of the average length of the high basis weight portion. The length.

The absorbent article according to any one of the above aspects, wherein the indicator is disposed between the covering material of the absorbent body and the back sheet, and is disposed on the back sheet. On the opposite side of the skin, the change in the color of the indicator can be visually recognized from the outside through the back sheet.

The absorbent article according to any one of the above aspects, wherein the indicator is in the lateral direction, and when the absorbent article is observed in a cross section, is disposed at a central portion in the lateral direction including the center line. .

The absorbent article according to any one of the above-mentioned items, wherein the indicator is in the longitudinal direction, and is disposed along the center line across the lower crotch portion to the back side portion and the crotch portion. Straight.

The absorbent article according to any one of the above aspects, wherein the indicator is arranged in parallel at equal intervals in the lateral direction by three elongated wires.

The absorbent article according to any one of the above aspects, wherein the width of the indicator 5 is 2 mm or more and 10 mm or less, or 3 mm or more and 8 mm or less.

The absorbent article according to any one of the above aspects, wherein the covering material is formed on the back sheet side of the absorbent core, and the side edges of the covering material are overlapped with each other. Covering the absorptive core, the overlapping portion extends over the indicator along a direction in which the indicator extends, and the overlapping portion is formed along the center line over the entire length of the absorber in the longitudinal direction. In the indicator, the width of the overlapping portion in the lateral direction is the same as or wider than the width of the indicator, and the ratio of the width W2 of the overlapping portion 420 to the width W1 of the indicator 5 (width/indication of the overlapping portion 420) The width of the agent 5 is 1.0 to 3.0, or 1.5 to 2.5.

The absorbent article according to any one of the above aspects, wherein the absorbent core system constituting the absorbent body is used to hold particles of the absorbent polymer in an aggregate of fibers such as pulp fibers. As the above-mentioned covering material constituting the absorbent body, a hydrophilic sheet, a water-permeable tissue paper or a water-permeable nonwoven fabric-coated core material is used.

The absorbent article according to any one of the above-mentioned items, wherein the indicator is directly coated with a colored material which is colored, discolored or achromatic by contact with the excrement. In the case where the back sheet has a different film or a sheet such as a nonwoven fabric or a back sheet, the colored material is a mixture of a pH indicator and an oxidizing compound.

The absorbent article according to any one of the above aspects, wherein the absorbent article is an unfolded disposable diaper.

The absorbent article according to the above <20>, wherein a pair of fastening tapes are provided on the left and right side edges of the back side portion, and a fastening tape for fixing the fastening tape is provided on the outer surface of the front side portion. Each of the both sides of the absorbent article in the longitudinal direction has a sheet for forming a three-dimensional gather having an elastic member that is fixed in a stretched state in a longitudinal direction, and is disposed on the side of the front sheet. This forms a pair of three-dimensional pleats, in the above absorbent article Each of the both side portions in the longitudinal direction, the plurality of leg elastic members for forming the leg gathers are disposed in a stretched state in the longitudinal direction, and the leg elastic members are contracted to form leg gathers, and The end portion in the longitudinal direction of the back side portion side of the absorbent article is disposed in a stretched state in the lateral direction in the waist elastic member for forming the waist gather, and the waist elastic wrinkles are formed by the contraction of the waist elastic member.

<22> The absorbent article according to the above <21>, wherein the front sheet is a liquid permeable non-woven fabric, or an apertured film, or a laminated body thereof, and the back sheet is made of a resin film or a resin film and a non-woven fabric. In the laminated body, the sheet for forming a three-dimensional pleat is a laminated sheet using a stretchable film, a nonwoven fabric, a woven fabric, or the like.

The absorbent article according to the above <21> or <22>, wherein the elastic member for forming the three-dimensional pleats, the leg elastic member, and the waist elastic member are made of natural rubber or polyurethane. A filament-like stretchable material of polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, and ethyl acrylate-ethylene polyethylene-α-olefin copolymer.

<24> The absorbent article according to any one of <1> to <19> wherein the absorbent article is a pant type disposable diaper.

[Industrial availability]

According to the absorbent article of the present invention, when the moisture of the excrement is small, the indicator can be easily discolored. In this way, since the indicator is easily discolored, it is possible to satisfy the need to change the diaper when the excrement is small. Further, according to the absorbent article of the present invention, it is easy to visually recognize which side of the front side portion and the back side portion of the indicator is discolored, and it is easy to determine what is the case, that is, if it is the ventral side portion, it is urine, or if it is a back The side is soft.

1‧‧‧Disposable diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧ indicator

7‧‧‧Buckle belt

8‧‧‧ buckle belt

9, 9X, 9Y‧‧‧ space

41‧‧‧Absorbable core

42‧‧‧Covered timber

43‧‧‧High base

44, 44X, 44Y‧‧‧ low basis weight

61‧‧‧Flexible components

62‧‧‧Three-dimensional pleat forming sheet

63‧‧‧ Leg elastic members

64‧‧‧Low elastic members

A‧‧‧ ventral side

B‧‧‧Back side

C‧‧‧Lower Department

CL‧‧‧ center line

L1, L2, L3‧‧‧ average length

W1‧‧‧Width

X, Y‧‧ direction

Claims (6)

An absorbent article comprising: a front sheet disposed on a facing surface side of the skin; a back sheet disposed on a non-skin facing surface side; and an elongated absorbent body disposed between the two sheets. Between the back sheet and the absorber, an indicator that is instructed to be excreted by a change in color is continuously disposed in the longitudinal direction; the absorber has an absorbent core including an absorbing polymer, and the absorbent core system has a base a high basis weight which is relatively high in weight and protrudes toward the back sheet side, and a low basis which is relatively low in basis weight adjacent to the high basis weight and which is recessed from the side of the back sheet toward the side of the front sheet a heavy portion, the high basis weight portion is integrally formed with the low basis weight portion, and on the side of the back sheet to which the indicator is provided, the high basis weight portion and the low basis weight portion are formed to extend along the indicator a concave-convex structure in which the directions are alternately arranged, the covering material covering the absorbent core is a hydrophilic sheet, and the covering material is formed on the side of the back sheet of the absorbent core to form a side edge of the covering material The coincidence of the parts The absorbent core, extending in the direction of the overlapping portion of the indicator described above the indicator on the extension, and the width of the overlapping portion with respect to ratio of the width of the above indicator of 1.0 to 3.0. The absorbent article according to claim 1, wherein the absorbent core is coated with the covering material, and a space is formed between the low basis weight portion of the absorbent core and the covering material on the back sheet side. . The absorbent article of claim 1 or 2, wherein, in plan view, the average length of the low basis weight in the direction in which the indicator extends is shorter than the average length of the high basis weight in the direction in which the indicator extends. The absorbent article of claim 3, wherein said average length of said low basis weight portion It is a length of 3% or more and 20% or less of the above average length of the high basis weight portion. The absorbent article according to claim 1 or 2, wherein the basis weight of the low basis weight portion is a basis weight of 20% or more and 80% or less of the basis weight of the high basis weight portion. The absorbent article according to claim 1 or 2, wherein the absorbent system is fixed to the back sheet via an adhesive in the lateral direction of the indicator, and the back sheet is not in the region of the indicator fixed.