JP2009101046A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which is excellent in fitness to the body and does not easily cause leakage. <P>SOLUTION: The absorbent article 1 includes a vertically long body 5 configured including an absorbent body 2 and a surface sheet 3 covering the absorbent body 2, and has a front part A including an excretion area P arranged while facing the excretion part of a wearer when worn and a rear part B disposed more on the back side than the front part A in the longitudinal direction. On the side of the surface sheet 3 of the body 5 at the body width direction center part of a rear area disposed more on the back side than the excretion area P when worn, rear compressed grooves 81 and 91 extending in the width direction of the body 5 are formed. With each of the rear compressed grooves 81 and 91 as a boundary, the thickness on the side of the longitudinal direction rear end 5b of the body 5 is increased compared to the thickness on the side of the longitudinal direction front end 5a of the body 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to absorbent articles such as sanitary napkins and incontinence pads.

In an absorbent article such as a sanitary napkin, in order to improve adhesion to the body and prevention of leakage, the absorbent body protrudes from the central part in the longitudinal direction and from the central part to the rear part (saddle part) so that the middle and high parts are formed. It is known to form.
It is also known that an absorbent article such as a sanitary napkin is provided with a pair of rear flaps (rear wings) extending outward in the width direction from the left and right sides along the longitudinal direction of the absorbent body. The rear flap is used by being attached to an underwear such as shorts without being folded back in a state of extending from the absorbent body, mainly covering the buttocks of the wearer of the absorbent article and leaking liquid from the buttocks side (rear) It plays a role of preventing leakage.

For example, in Patent Document 1, a medium-high portion is formed from the center in the longitudinal direction on the skin contact surface side of the absorbent main body to the rear portion, and liquid is held on both left and right sides in the longitudinal direction of the rear portion of the absorbent main body. It is disclosed to provide a pair of left and right rear wing portions each having a sex-shaped wing portion absorber.
Further, in Patent Document 2, a front middle high part and a rear middle high part are separately formed on the front part and the rear part of the absorbent article, respectively, and the folding is performed between the front middle high part and the rear middle high part. It is disclosed to provide a recess that acts as a starting point.

JP 2000-189459 A JP 2006-239162 A

In the absorbent article described in Patent Document 1, since the middle and high portions are continuously formed from the center in the longitudinal direction to the rear portion, the middle and high portions are less likely to follow the body shape, and between the middle and high portions and the body. There was a problem in terms of fit, liquid absorbability, and heel coverage by the rear wing.
Moreover, in the absorbent article described in Patent Document 2, although a concave portion that acts as a bending start point is formed between the front middle high portion and the rear middle high portion, the height of both the middle high portions is substantially Since the thickness change of the absorbent article is the same as above, it is not sufficient in terms of fit, and anxiety remains in prevention of after-leakage.

  Therefore, the objective of this invention is providing the absorbent article which is excellent in the fitting property with respect to a body, and is hard to produce a leak.

  The present invention includes a vertically long main body configured to include an absorbent body and a surface sheet that covers the absorbent body, and includes a front portion including an excretion region that is disposed opposite to a wearer's excretion site when worn, An absorbent article having a rear part arranged on the back side from the part in the longitudinal direction, and the body of the main body in the central part in the body width direction of the rear area arranged on the back side than the excretion area when worn A rear pressing groove extending in the width direction of the main body is formed on the surface sheet side, and the thickness of the rear end side in the longitudinal direction of the main body is the thickness of the front end side in the longitudinal direction of the main body with the rear pressing groove as a boundary. The above object is achieved by providing an absorbent article that is larger than the above.

  The absorbent article of the present invention has excellent fit to the body and is less likely to leak, particularly after-leakage.

Hereinafter, the absorptive article of the present invention is explained based on the desirable embodiment with reference to drawings.
The sanitary napkin as 1st Embodiment of the absorbent article of this invention is shown by FIG.1 and FIG.2.

  The napkin 1 according to the first embodiment includes an absorbent body 2, a liquid-permeable surface sheet 3 that covers the absorbent body 2 and comes into contact with the wearer's skin when the napkin 1 is worn, and liquid-impermeable or water-repellent. A vertically long main body 5 including the back sheet 4 is provided. The napkin 1 has, in the longitudinal direction, a front part A including an excretion area P disposed opposite to a body fluid excretion part of the wearer when worn, and a rear part B arranged on the back side of the front part A. is doing. Of the both ends of the napkin 1 in the longitudinal direction, the one located at the front portion A is the napkin longitudinal front end 1a, and the one located at the rear portion B is the napkin longitudinal rear end 1b. The napkin longitudinal front end 1a coincides with the longitudinal front end (main body longitudinal front end) 5a of the main body 5, and the napkin longitudinal rear end 1b coincides with the longitudinal rear end (main body longitudinal rear end) 5b of the main body 5. The boundary between the front part A and the rear part B exists at the approximate center in the longitudinal direction of the napkin 1 (main body 5). The main body 5 is a substantially rectangular body-shaped member having a width equal to the maximum width of the absorber 2 in the front portion A over substantially the entire length in the longitudinal direction.

  The top sheet 3 covers the entire area of the upper surface (skin contact surface side) of the absorber 2, and the back sheet 4 covers the entire area of the bottom surface (non-skin contact surface side) of the absorber 2. The top sheet 3 and the back sheet 4 extend outward in the width direction from the left and right side edges in the longitudinal direction of the main body 5 in the rear part B, and form a pair of rear flaps 6 and 6. Further, the top sheet 3 and the back sheet 4 extend outward in the width direction from the left and right side edges in the longitudinal direction of the main body 5 at the position of the excretion region P in the front part A to form a pair of wing parts 7 and 7. Yes. The wing portion 7 is used by being folded back to the outer surface side of the crotch portion of the underwear when the napkin 1 is attached. The top sheet 3 and the back sheet 4 are bonded to each other by heat sealing or the like at the side edges of the main body 5 and at the ends of the extended portions from both ends in the longitudinal direction to form a seal portion.

A main body adhesive portion (not shown) is provided at a predetermined position located below the absorbent body 2 on the non-skin contact surface side of the back sheet 4, and a wing portion adhesive is provided on the non-skin contact surface side of the wing portion 7. Each part (not shown) is provided. The main body adhesive part and the wing part adhesive part are both fixing means for fixing the napkin 1 to the underwear, and are provided by applying a hot melt adhesive to a predetermined location. The main body adhesive portion and the wing portion adhesive portion are covered with a release sheet (not shown) made of a film, a nonwoven fabric, paper, or the like before the napkin 1 is used.
The “skin contact surface side” is the surface facing the wearer's skin when wearing the napkin, and the “non-skin contact surface” is the underwear side (opposite to the wearer's skin side). Side). The “longitudinal direction” is a direction along the longitudinal direction of the napkin or various members, and the “width direction” is a direction orthogonal to the longitudinal direction.

  A first rear squeezing groove 81 and a first squeezing groove 81 extending in the width direction of the main body 5 are provided on the side of the top sheet 3 of the main body 5 in the central portion in the main body width direction of the rear area disposed on the back side of the excretion area P when worn. Two rear pressing grooves 91 are formed. The plurality of rear pressing grooves 81 and 91 are arranged in parallel at a predetermined interval in the longitudinal direction of the main body 5, and the first rear pressing groove 81 is longer in the napkin longitudinal direction than the second rear pressing groove 91. It is located closer to the front end 1a. The rear squeezing grooves 81 and 91 are both grooves formed by integrally compacting the topsheet 3 and the absorbent body 2. For example, the main body 5 is squeezed from the topsheet 3 side using a known embossing device. Can be formed.

  The boundary between the excretory region P and the rear region is located at a position slightly deviated from the center in the longitudinal direction of the napkin 1 (boundary between the front portion A and the rear portion B) toward the front end 1a in the napkin longitudinal direction. It exists in the position 0-30 mm apart along the longitudinal direction of the napkin 1 toward the napkin longitudinal direction front end 1a from the longitudinal direction center (virtual line which bisects the napkin 1 in the longitudinal direction). Therefore, the rear region may include not only the rear part B but also a part of the front part A (a part of the front part A near the rear part B). The rear region in the first embodiment shown in FIG. 1 is composed of a region that is a part of the front portion A, a region behind the second transverse groove 86 described later in the front portion A, and the entire region of the rear portion B.

  In the first embodiment, as shown in FIG. 1, the entire periphery pressing groove 8 surrounding the excretion region P is formed on the surface sheet 3 side of the main body 5, and the first rear pressing groove 81 is It is a part of the whole circumference pressing groove 8. That is, the portion of the entire circumferential pressing groove 8 near the rear end 5 b in the main body longitudinal direction also serves as the first rear pressing groove 81. Similarly to the second rear pressing groove 91, the first rear pressing groove 81 has a convex arc shape toward the rear end 1b in the napkin longitudinal direction. Since the area | region (excretion area | region P) enclosed by the all-around compression groove | channel 8 will protrude to a wearer's skin side when the all-around compression groove | channel 8 is formed, the body shape of the front part A which has the excretion area | region P especially Followability with respect to the film, and good fit and liquid absorbability can be obtained. The all-around pressing groove 8 is a groove formed by integrally compacting the top sheet 3 and the absorbent body 2, for example, by pressing the main body 5 from the top sheet 3 side using a known embossing device. Can be formed.

  Since the rear pressing grooves 81 and 91 are formed, the flexibility in the longitudinal direction of the napkin 1 is increased, and the napkin 1 is easily bent to the skin contact surface side with the rear pressing grooves 81 and 91 being bent as respective starting points. The followability to the body shape of the whole napkin 1 is increased. Moreover, since the flexibility of the longitudinal direction of the back part B will fall when the area | region of the center of the width direction of the front part A surrounded by the perimeter pressing groove 8 as mentioned above protrudes, this is forced into a body shape. There is a problem that a ridge extending in the width direction of the napkin occurs when it is aligned, leading to a decrease in leakage prevention and fit, but the formation of such ridges by forming the rear squeezing grooves 81 and 91 Generation is effectively suppressed. In particular, when the first rear pressing groove 81 is formed as a part of the entire circumferential pressing groove 8 as in the first embodiment, generation of such wrinkles is effectively suppressed.

The rear pressing groove located closest to the front end in the longitudinal direction of the absorbent article among the plurality of rear pressing grooves, such as the first rear pressing groove 81, is the center in the longitudinal direction of the napkin 1 (the hypothesis that bisects the napkin 1 in the longitudinal direction). Line)) may be on the napkin longitudinal front end 1a side, or on the napkin longitudinal rear end 1b side. Moreover, it is more stable in the effect | action by the back pressing grooves 81 and 91 which this back pressing groove exists in the position 0-30 mm apart from this virtual line along the longitudinal direction of the napkin 1, especially 0-20 mm apart. It is preferable at the point made to obtain.
From the same viewpoint, the shortest distance between the first rear pressing groove 81 and the second rear pressing groove 91 (the shortest distance between adjacent rear pressing grooves) is 10 to 40 of the total length in the longitudinal direction of the napkin 1. % Is preferable, and 20 to 30% is more preferable.
Further, from the same viewpoint, each of the rear pressing grooves 81 and 91 is preferably formed over a range of 40 to 90% with respect to the maximum width of the main body 5 in the formation site of the rear pressing grooves, More preferably, it is formed over a range of 80%.

  The width of each of the rear pressing grooves 81 and 91 is preferably 20 to 70 mm, more preferably 30 to 60 mm, and the depth is preferably 2 to 10 mm, and more preferably 3 to 8 mm. Further, the depth (D) of each of the rear pressing grooves 81 and 91 is a portion where the pressing groove is not formed (however, limited to a portion made of the same constituent member as the portion where the pressing groove is formed). The ratio (D / T0) to the thickness T0 is preferably 0.5 to 0.99, more preferably 0.7 to 0.95.

  As shown in FIG. 1, the entire circumferential groove 8 is formed symmetrically across a virtual line (not shown) that bisects the width direction of the napkin 1 and protrudes outward in the width direction of the napkin 1. The curved portion has a shape in which three constricted portions 8a and 8b are sandwiched in the longitudinal direction of the napkin, and the convex curved portion located in the middle of these three is the napkin of the excretory region P. It is located outside in the width direction. That is, the all-around pressing groove 8 has two pairs of constricted portions 8a, 8a and 8b, 8b which are in love with each other. Since the all-round squeezing groove 8 has such a shape, as compared to the case where the all-round squeezing groove 8 has a shape without a constricted portion as in a third embodiment to be described later, Since it becomes easier to raise the wearer's skin side in the region (excretion region P) surrounded by the compressed groove 8, the followability of the front portion A to the body shape is further enhanced.

A first transverse groove 85 extending in the width direction of the main body 5 is formed between the pair of constricted portions 8a and 8a opposed to each other in the region closed by the entire circumferential groove 8 and is opposed to each other. A second transverse groove 86 extending in the width direction of the main body 5 is formed between the pair of constricted portions 8 b and 8 b, and the excretion region P is located between the pair of transverse grooves 85 and 86. The transverse grooves 85 and 86 are both formed in the front portion A, and the second transverse groove 86 located behind the excretion region P is not formed in the rear region as described above (first 2) The transverse groove 86 is not the rear pressing groove). The first transverse groove 85 is formed in a convex arc shape toward the napkin longitudinal direction front end 1a, and the second transverse groove 86 is formed in a convex arc shape toward the napkin longitudinal direction rear end 1b. The squeezing grooves 85 and 86 are not connected to the entire circumferential squeezing groove 8. Due to the presence of the transverse grooves 85 and 86, the distortion caused by the bulge on the skin side of the wearer of the region (excretion region P) surrounded by the entire circumferential compressed groove 8 becomes difficult to be transmitted to the rear part B. The effect of the rear squeezing groove 81 is further enhanced, and inconvenience such as wrinkles due to the distortion is less likely to occur in the rear part B.
The entire circumferential pressing groove 8 (part excluding the rear pressing groove 81), the width and depth of each of the transverse grooves 85 and 86, and the D / T0 can be the same as the rear pressing grooves 81 and 91, respectively.

In the absorbent article of the present invention having the rear pressing groove as described above, the thickness on the rear end side in the longitudinal direction of the main body is compared with the thickness on the front end side in the longitudinal direction of the main body with the rear pressing groove as a boundary. It has been made bigger. In the case where a plurality of rear pressing grooves are formed as in the first embodiment, the relationship between the thicknesses of the main body is established with respect to the regions located before and after each of the rear pressing grooves.
That is, in the napkin 1 of the first embodiment, the thickness T2 (see FIG. 3) on the longitudinal rear end 5b side of the main body 5 is on the longitudinal front end 5a side of the main body 5 with the first rear compressed groove 81 as a boundary. Larger than the thickness T1 (see FIG. 2) (T2> T1). Further, with the second rear compressed groove 91 as a boundary, the thickness T3 (see FIG. 4) of the main body 5 on the longitudinal rear end 1b side is larger than the thickness T2 on the longitudinal front end 5a side of the main body 5 (T3). > T2). The “thickness” herein refers to no load in each region of the main body 5 (excluding a region within 10 mm from the periphery of the rear compressed groove 81 (91)) located at the front and rear of the rear compressed groove 81 (91). It means the maximum thickness below (maximum value of thickness at any of a plurality of measurement points under a load of 0.5 g / cm ² by a handy compression tester KES-G5).

  Thus, the napkin 1 of 1st Embodiment makes the napkin longitudinal direction from the main body longitudinal direction front end 5a to the main body longitudinal direction rear end 5b (each from the napkin longitudinal direction front end 1a), using the plurality of rear pressing grooves 81 and 91 as boundaries. The thickness of the main body 5 is designed to increase (toward the direction rear end 1b). Since the napkin 1 having such a configuration has two folding starting points of the rear pressing grooves 81 and 91, it easily fits the body shape and has the above-described thickness change. Especially, the fitting property with respect to the body shape of the rear part B is high and the covering property of the buttocks is excellent. Since the napkin 1 fits the wearer's crotch part and its periphery in this way, the liquid absorbability is good, and liquid leakage such as rear leakage hardly occurs.

Difference between the thickness T2 of the region of the main body 5 located on the main body longitudinal direction rear end 5b side and the thickness T1 of the main body 5 region located on the main body longitudinal direction front end 5a side with the first rear compressed groove 81 as a boundary ( T2-T1) is preferably 1.5 to 5 mm, and more preferably 2 to 3 mm, from the viewpoint of ensuring the above-described effects.
Difference between the thickness T3 of the region of the main body 5 located on the main body longitudinal direction rear end 5b side and the thickness T2 of the main body 5 region located on the main body longitudinal direction front end 5a side with the second rear compressed groove 91 as a boundary ( T3-T2) is preferably the same as T2-T1.

  The thickness T1 is preferably 1.5 to 6 mm, more preferably 2 to 5 mm. The thickness T2 is preferably 3 to 10 mm, more preferably 4 to 8 mm. The thickness T3 is preferably 4.5 to 12 mm, more preferably 5 to 10 mm.

The napkin 1 according to the first embodiment includes the main body 5 having the thickness change as described above with the rear pressing grooves 81 and 91 as a boundary, and further the main body 5 with the rear pressing grooves 81 and 91 as a boundary. The bending rigidity on the rear end 5b side in the longitudinal direction is larger than that on the front end 5a side in the longitudinal direction of the main body 5.
That is, in the napkin 1 according to the first embodiment, the bending rigidity G2 on the longitudinal rear end 5b side of the main body 5 is changed to the bending rigidity G1 on the longitudinal front end 5a side of the main body 5 with the first rear compressed groove 81 as a boundary. Larger than that (G2> G1). Further, with the second rear compressed groove 91 as a boundary, the bending rigidity G3 on the longitudinal rear end 1b side of the main body 5 is larger than the bending rigidity G2 on the longitudinal front end 5a side of the main body 5 (G3> G2). . The “bending rigidity” referred to here is the following in each of the regions of the main body 5 (excluding the region within 10 mm from the periphery of the rear compressed groove 81 (91)) located at the front and rear of the rear compressed groove 81 (91) as a boundary. It means the bending stiffness measured by the measuring method.
With such a configuration, the napkin 1 is particularly easy to bend the rear part B, and the followability of the rear part B with respect to the body shape is further enhanced, which has a favorable effect on fit and liquid absorbability. The bending rigidity is easily affected by the thickness of the portion and the forming material, and generally increases as the thickness increases and the forming material is harder. The bending stiffness is measured as follows.

(Measurement method of bending stiffness)
For the measurement of the bending stiffness, a HOM-2 handle ohmmeter tester manufactured by Seisakusho Co., Ltd., which conforms to JIS L1096 (general fabric test method, confirmation 2004) stiffness / softness E method is used. The test piece (main body of the absorbent article) is placed on the sample table of the test machine with the slit distance adjusted to 30 mm so that the measurement site of the test piece is located at the center between the slits and the main body (absorber). These are arranged horizontally so that the direction along the longitudinal direction coincides with the direction orthogonal to the direction between the slits. Do not fix the specimen on the sample stage. A blade adjusted so as to descend to a position (lowermost position) 8 mm below the surface of the sample stage is lowered from above the test piece at a constant speed of 200 mm / min. Then, the maximum value (cN) indicated by the indicator (load meter) when the test piece is pressed back and forth with the blade in the length direction is read. The measurement was performed three times with different test pieces, and the average value was calculated as the bending stiffness.
As for the test piece, as described above, the test piece does not include the rear compressed parts 81 and 91 and the periphery thereof, and the width of the absorbent article is set to the width of the test piece as it is, and the length in the longitudinal direction is 60 mm. adjust. Moreover, when there exists adhesive parts, such as a main body adhesive part mentioned above, in the non-skin contact surface side of an absorbent article, talc etc. are used so that this adhesive part may not express adhesiveness. Moreover, about a measurement, a test piece is installed so that it may be 15 mm apart from a slit edge part, and a longitudinal direction edge part may be set, and measurement conditions shall be 23 degreeC and 50% RH environment.

The ratio of the bending rigidity G2 of the region of the main body 5 located on the longitudinal rear end 5b side to the bending rigidity G1 of the region of the main body 5 located on the main body longitudinal direction front end 5a side with the first rear compressed groove 81 as a boundary ( G2 / G1) is preferably 1.2 to 5 and more preferably 1.5 to 4 from the viewpoint of ensuring the above-described effects.
The ratio of the bending rigidity G3 of the region of the main body 5 located on the rear side of the main body longitudinal direction 5b to the bending rigidity G2 of the main body 5 in the main portion longitudinal direction rear end 5b side with respect to the second rear pressing groove 91 as a boundary. (G3 / G2) is preferably the same as G2 / G1.
Further, the bending rigidity G1 is preferably 10 to 80, more preferably 15 to 50. The bending rigidity G3 is preferably 30 to 150, and more preferably 50 to 120.

The thickness change and the bending rigidity change as described above in the napkin 1 of the first embodiment are mainly realized by adopting the configuration of the absorbent body 2 described below.
The absorbent body 2 according to the first embodiment extends from the front part A to the rear part B and is formed on the skin contact surface side of the lower layer absorbent body 20 in the rear part B. The first rear absorbent body 21 is disposed, and the second rear absorbent body 22 is disposed on the skin contact surface side of the first rear absorbent body 21. The 1st back absorber 21 is arranged in the field arranged on the back side rather than the 1st back pressing slot 81, and the 2nd back absorber 21 is on the back side rather than the 2nd back pressing slot 91. Arranged in the area. The lower layer absorbent body 20 has both side edges in the longitudinal direction extending outward in the width direction in the rear part B, and the extended parts 20f and 20f form a pair of rear flaps 6 and 6 together with the top sheet 3 and the back sheet 4. ing.
Between the skin contact surface side of the lower layer absorbent body 20 and the non-skin contact surface side of the first rear absorbent body 21, the skin contact surface side of the first rear absorbent body 21 and the non-skin of the second rear absorbent body 22 The abutting surface side may be joined by a joining means such as an adhesive.

The first rear absorbent body 21 is in the shape of a vertically long plate, and the longitudinal front end 21a near the first rear compressed groove 81 in the first rear absorbent body 21 is convex toward the napkin longitudinal rear end 1b in plan view. It has a circular arc shape.
The width (maximum width) W1 of the first rear absorber 21 has substantially the same width as the maximum width (width of the main body 5) W0 in the front part A of the lower layer absorber 20. The ratio (W1 / W0) between the width W1 of the first rear absorber 21 and the maximum width W0 in the front portion A of the lower layer absorber 20 is preferably 0.9 to 1.1, more preferably 0.95 to 1. .05. Further, the ratio (L1 / L0) of the length (L1) in the longitudinal direction of the first rear absorber 21 and the length (L0) in the longitudinal direction of the lower layer absorber 20 is preferably 0.3 to 0.6. More preferably, it is 0.35-0.55.

About the positional relationship between the longitudinal direction front end 21a of the 1st back absorber 21, and the 1st back pressing groove 81, any form of following 1) and 2) may be sufficient.
1) The form which the longitudinal direction front end 21a of the 1st back absorber 21 is located near the longitudinal direction rear end 5b of the main body 5 rather than the 1st back pressing groove 81 (refer FIG. 1).
2) A form in which the front end 21a in the longitudinal direction of the first rear absorber 21 and the first rear pressing groove 81 overlap.
In the form 1), the distance between the longitudinal front end 21a of the first rear absorber 21 and the first rear pressing groove 81 is preferably 2 to 10 mm, more preferably 3 to 7 mm.

The second rear absorber 22 has a vertically long flat plate shape and is narrower than the first rear absorber 21. The front end 22a in the longitudinal direction of the second rear absorbent body 22 near the second rear pressing groove 91 has a convex arc shape toward the rear end 1b in the longitudinal direction of the napkin in plan view, and has a body groove shape. It is easy to follow.
The ratio (W2 / W0) between the width (maximum width) W2 of the second rear absorber 22 and the maximum width W0 in the front portion A of the lower layer absorber 20 is preferably 0.3 to 1.1, more preferably 0. .4 to 0.8. Moreover, the ratio (L2 / L0) of the length (L2) in the longitudinal direction of the second rear absorber 22 and the length (L0) in the longitudinal direction of the lower layer absorber 20 is preferably 10-30, more preferably 10-20.
About the positional relationship of the longitudinal direction front end 22a of the 2nd back absorber 22, and the 2nd back pressing groove 91, the position of the longitudinal direction front end 21a of the 1st back absorber 21 mentioned above and the 1st back pressing groove 81 is mentioned. Same as relationship.

  As the 1st back absorber 21 and the 2nd back absorber 22, what is usually used as an absorber in a sanitary napkin can be used especially without limitation, for example, from hydrophilic fibers, such as defibrated pulp Or a fiber assembly in which a superabsorbent polymer is held can be used. Such a fiber assembly may be substantially entirely covered with a mount made of paper or non-woven fabric.

The basis weight of the first rear absorber 21 is preferably 120 to 400 g / m ² , more preferably 150 to 300 g / m ² , and it is preferable to have a superabsorbent polymer.
The basis weight of the second rear absorbent body 22 is preferably 120 to 400 g / m ² , more preferably 150 to 300 g / m ² , and preferably does not have a superabsorbent polymer, and is made of pulp fiber? It is preferable that it is mixed with synthetic fiber and has a lower density than the first rear absorber 21.
Due to the presence of the first rear absorbent body 21 and the second rear absorbent body 22 having such a configuration, the fit of the napkin in the longitudinal direction is enhanced, and when the napkin is made to conform to the body shape, the napkin is enlarged in the longitudinal direction. Since there is no need to bend and the depressions of the rear pressing grooves 81 and 91 are not completely closed, leakage prevention particularly at the rear portion B can be enhanced.

  As the lower layer absorber 20, the same thing as the 1st back absorber 21 and the 2nd back absorber 22 can be used. In particular, a sheet-like material having a high liquid retention property or a material containing the sheet material is preferable. For example, an absorbent sheet in which a superabsorbent polymer is sandwiched between paper, nonwoven fabric, etc .; drying after the paper making process at the time of manufacturing the sheet By dispersing the superabsorbent polymer particles on the sheet in the meantime, an absorbent sheet in which the superabsorbent polymer particles are dispersed in the thickness direction can be used. Moreover, a sheet-like material with low liquid diffusibility can also be used. Specific examples of sheet-like materials with low liquid diffusibility include emulsification of dry pulp sheets (trade name “JS-50HB” manufactured by Havix Co., Ltd.) and other wet-absorbent papers in which pulp is piled and fixed with a binder. Embossed absorbent paper, etc., among which embossed absorbent paper is particularly preferred from the viewpoint of cost.

The basis weight of the lower layer absorber 20 is preferably 40 to 300 g / m ² , more preferably 80 to 250 g / m ² .
The length (full length) of the lower layer absorber 20 in the longitudinal direction is preferably 26 to 45 cm, more preferably 28 to 40 cm, and the maximum width (width of the main body 5) in the front portion A is preferably 6.5. It is 8.5 cm, More preferably, it is 7.5-8.5 cm.

  As described above, the napkin 1 according to the first embodiment includes the pair of rear flaps 6 and 6 extending outward in the width direction from the left and right side edges of the rear portion B of the main body 5. The extension (maximum) width of the rear flap 6 from the longitudinal side edge of the main body 5 is preferably 120 to 240% of the width of the main body 5 (maximum width at the front portion A of the lower layer absorbent body 20).

In the first embodiment, the rear flap 6 is substantially continuous with the absorber material forming the excretion region P, that is, the lower layer absorber 20. Here, “substantially continuous” includes (1) a form (absorber) in which the absorber material forming the excretory region P and the rear flap are inseparably formed as in the first embodiment. (2) A form in which the absorbent material and the rear flap are detachably joined (for example, a perforation between the absorbent material and the rear flap) And (3) a configuration in which the absorber material and the rear flap that is separate from the absorber material are wrapped together in a sheet.
Since the rear flap 6 is substantially continuous with the absorber material forming the excretion region P, the liquid excreted in the excretion region P can be smoothly transferred to the rear flap 6, and the liquid as the napkin 1 as a whole Absorbability is further increased. Particularly, the form (1) is excellent in the effect of improving fit.

  Moreover, although the extension part 20f (back flap absorber 20f) of the lower layer absorbent body 20 is flexible and preferably has excellent hip covering properties, in the case of (1), a heat embossing treatment in which it is partially compressed For example, the thickness of the absorber can be suppressed to improve the fit (coverability), and the flexibility can be sufficiently obtained. In this way, having the rear flap absorber 20f thinner than the lower layer absorber 20 quickly absorbs the liquid flowing in the rear side direction, suppresses leakage from the end portion, and even if the amount of absorption at the rear flap 6 is large. The secondary effect is that the liquid can be moved to the lower layer absorber 20.

  As the top sheet 3 and the back sheet 4, various types conventionally used in the technical field can be used without particular limitation. As the surface sheet 3, for example, various liquid-permeable sheet materials such as a nonwoven fabric and an apertured film can be used. The back sheet 4 may be liquid-impermeable or liquid-permeable, for example, a resin film that does not have moisture permeability, a resin film that has fine holes and has moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, and the like. A laminate with this sheet can be used.

The napkin 1 of the first embodiment can be used by being attached to underwear in the same manner as a sanitary napkin with a normal rear flap (for night use).
And according to the napkin 1 of 1st Embodiment, since the thickness of the main body 5 is large toward the main body longitudinal direction rear end 5b from the main body longitudinal direction front end 5a by making the back pressing groove 81,91 into a boundary, an absorber 2 is easily adapted to the body shape, and satisfactory results are obtained in terms of liquid absorbency, covering of the buttock by the rear part B, and fit (particularly, fit of the rear part B). Moreover, generation | occurrence | production of the wrinkle along the napkin width direction which generate | occur | produces at the time of wear is suppressed by the back pressing groove 81,91.

  Next, another embodiment of the present invention will be described with reference to the drawings. Regarding other embodiments to be described later, components that are different from the napkin 1 of the first embodiment described above will be mainly described, and similar components will be denoted by the same reference numerals and description thereof will be omitted. The description about the napkin 1 of 1st Embodiment is applied suitably to the component which is not demonstrated especially.

The napkin 1 of 2nd Embodiment is shown by FIGS. The napkin 1 according to the second embodiment is different from the first embodiment in the configuration of the absorbent body 2, particularly the shapes of the lower layer absorbent body 20 and the first rear absorbent body 21.
That is, in the second embodiment, the lower layer absorbent body 20 has a constant width over the entire length in the longitudinal direction, and instead of forming the rear flap 6, the first rear absorbent body 21 is In the rear part B, both side edges in the longitudinal direction extend outward in the width direction, and the extension parts 21f, 21f (rear flap absorber 21f) form a pair of rear flaps 6, 6 together with the top sheet 3 and the back sheet 4. Forming. Further, the first embodiment also includes that the two circumferentially compressed grooves 8 are not connected to each other in the two pairs of constricted portions 8a, 8a and 8b, 8b, and the entire circumferential compressed groove 8 is divided into three in the longitudinal direction. Different from form. Also by the second embodiment having such a configuration, the same effects as those of the first embodiment can be obtained.

In the second embodiment, unlike the first embodiment, the second rear absorber 22 has a rectangular shape, a trapezoidal shape, or a similar shape in plan view, but the rear flap absorber 21f is the first. The second rear absorber 22 is formed in a form extending to the rear absorber 21 and the second rear absorber 22 is formed immediately above the first rear absorber 21, so that the second rear absorber 22 is the rear end in the longitudinal direction of the main body 5. If it is formed widely also on the 5b side, the covering effect of the hips can be enhanced.
Moreover, in 2nd Embodiment compared with 1st Embodiment, the shape in the planar view of the 1st back pressing groove 81, and the longitudinal direction front end 21a near the 1st back pressing groove 81 in the 1st back absorber 21 are shown. Due to the high similarity to the shape in plan view (both are formed in an arc shape having the same degree of curvature), the compressed groove is not partially crushed, and moderate bending ease and absorber It is possible to suppress the occurrence of wrinkles.

The napkin 1 of 3rd Embodiment is shown by FIGS. 8-10. The napkin 1 of the third embodiment is different from the first embodiment in that a single rear compressed groove 81 is formed instead of a plurality. The rear pressing groove 81 of the third embodiment is a part of the entire circumferential pressing groove 8, and a portion of the entire circumferential pressing groove 8 near the rear end 5 b in the main body longitudinal direction also serves as the rear pressing groove 81.
Moreover, the absorber 2 of 3rd Embodiment was arrange | positioned at the skin contact surface side of the lower layer absorber 20 and the 1st back absorber 21 similar to 2nd Embodiment, and the lower layer absorber 20 in the front part A. The front absorbent body 23 is included. That is, both the front part A and the rear part B are configured to include two layers of absorbers.

The front absorbent body 23 is vertically long and narrower than the lower layer absorbent body 20 and is disposed so as to straddle the excretion region P. The front absorbent body 23 is surrounded by the entire circumferential compressed groove 8, and is thereby enclosed in a closed space composed of the top sheet 3 and the lower layer absorbent body 20. The presence of the front absorbent body 23 allows the front part A to have a medium-high structure, so that the fit to the body shape and the liquid absorbability in the excretion region P are enhanced, and the formation of the above-described all-round compressed groove 8 is performed. The resulting distortion is reduced and wrinkles are less likely to occur.
In addition, even if the front absorber 23 is formed and the front part A has a medium height, the napkin 1 of the third embodiment has a thickness T2 on the side of the rear end 5b in the longitudinal direction of the main body 5 with the rear compressed groove 81 as a boundary. (See FIG. 10) is larger than the thickness T1 (see FIG. 9) on the longitudinal front end 5a side of the main body 5 (T2> T1), and the rear side of the main body 5 with respect to the rear compressed groove 81 as a boundary. The bending rigidity G2 on the end 5b side is larger than the bending rigidity G1 on the front end 5a side in the longitudinal direction of the main body 5 (G2> G1).

As the front absorber 23, the thing similar to the 1st back absorber 21 can be used.
The thickness of the laminated portion of the front absorber 23 and the lower layer absorber 20 under no load is preferably 3 to 10 mm, more preferably 4 to 8 mm, and the basis weight of the front absorber 23 alone is preferably 40 to 300g / m ^2, more preferably from 80~250g / m ^2.
Further, the ratio (W3 / W0) between the width (maximum width) W3 of the front absorber 23 and the maximum width W0 in the front portion A of the lower layer absorber 20 is preferably 0.2 to 0.5, more preferably 0. .3 to 0.4. The ratio (L3 / L0) of the length (L3) in the longitudinal direction of the front absorbent body 23 and the length (L0) in the longitudinal direction of the lower layer absorbent body 20 is preferably 0.1 to 0.5, more preferably. 0.2 to 0.4.
According to the third embodiment having such a configuration, substantially the same effect as that of the first embodiment can be obtained. However, in the third embodiment, since only one rear pressing groove is formed, compared with the first and second embodiments in which a plurality of rear pressing grooves are formed, the thickness change and the rigidity change are poor. Inferior fit.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, the rear squeezing grooves 81 and 91 may be formed so as to extend in the width direction of the main body 5 on the surface sheet 3 side of the main body 5 in the central portion in the main body width direction of the rear region. Is not limited to the arc shape as in the above-described embodiment, and may be a linear shape, a trapezoidal shape, or the like. Moreover, the number of back pressing grooves may be one or plural, and can be set as appropriate.
Further, the wing portion 7 may be provided with an absorber. Further, the wing part 7 itself may not be provided.
Moreover, in the said embodiment, although the sanitary napkin was mentioned as one of the application examples of the absorbent article of this invention, For example, it can apply also to a panty liner, a sheet, a incontinence pad, etc.

It is a top view which shows the skin contact surface side (surface sheet side) of the sanitary napkin which is 1st Embodiment of this invention. It is sectional drawing which shows typically the XX sectional view of FIG. It is sectional drawing which shows the YY sectional view typically of FIG. It is sectional drawing which shows the ZZ line | wire cross section of FIG. It is a top view which shows the skin contact surface side (surface sheet side) of the sanitary napkin which is 2nd Embodiment of this invention. It is sectional drawing which shows the XX sectional view typically of FIG. It is sectional drawing which shows the YY line cross section of FIG. 5 typically. It is a top view which shows the skin contact surface side (surface sheet side) of the sanitary napkin which is 3rd Embodiment of this invention. It is sectional drawing which shows the XX sectional view typically of FIG. It is sectional drawing which shows the YY sectional view typically of FIG.

Explanation of symbols

1 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 2 Absorber 20 Lower layer absorber 21 1st back absorber 22 2nd back absorber 23 Front absorber 3 Top sheet 4 Back sheet 5 Main body 6 Back flap 7 Wing part 8 Whole circumference pressing groove 81 1st back pressing groove 8a Part 85 First transverse groove 86 Second transverse groove 91 Second rear compressed groove A Front part B Rear part P Excretion area

Claims (4)

A front portion including a vertically long main body configured to include an absorbent body and a surface sheet that covers the absorbent body, and including an excretion region that is disposed opposite to the excretion site of the wearer when worn; An absorptive article having a rear portion arranged in the longitudinal direction,
A rear squeezing groove extending in the width direction of the main body is formed on the surface sheet side of the main body in the central portion in the main body width direction of the rear area disposed on the back side of the excretion area when worn,
An absorbent article having a thickness on the rear end side in the longitudinal direction of the main body as compared with the thickness on the front end side in the longitudinal direction of the main body with the rear compressed groove as a boundary.   2. The absorbent article according to claim 1, wherein the bending rigidity on the rear end side in the longitudinal direction of the main body is larger than the bending rigidity on the front end side in the longitudinal direction of the main body with the rear compressed groove as a boundary.   A pair of rear flaps extending outward in the width direction from the left and right side edges of the rear portion of the main body, the rear flaps being substantially continuous with the absorbent material forming the excretion region. The absorbent article according to 1 or 2.   A circumferential squeezing groove surrounding the excretion region is formed on the surface sheet side of the main body, and a portion of the circumferential squeezing groove near the rear end in the longitudinal direction also serves as the rear squeezing groove. The absorbent article according to any one of claims 1 to 3.

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