JP2014100201A - Absorbent article - Google Patents

Abstract

The present invention provides an absorbent article that can block a liquid flowing out in the lateral direction due to a wearer's movement or the like even when the excretion amount is small, and can maintain a soft touch, a dry feeling, and the like.
A top sheet 1 disposed on a skin contact surface side, a back sheet 2 disposed on a non-skin contact surface side, and a liquid-retaining absorbent core 3 disposed between both sheets. The absorbent core includes hydrophilic fibers and a water-absorbing polymer, and is divided into a pair of left and right side absorbent parts 36 and a central absorbent part 37 sandwiched between the absorbent parts in the lateral direction. The part collecting part is arranged in the vertical direction in plan view, and the basis weight of the water absorbent polymer of the side absorbent part is larger than that of the central absorbent part, and the basis weight (q1) of the water absorbent polymer of the side absorbent part is The ratio (q1 / q2) to the basis weight (q2) of the water-absorbing polymer of the central absorbent portion is 2 or more and 5 or less, and the absorbent core has a groove portion 8 penetrating in the thickness direction with the side absorbent portion. An absorbent article disposed in the longitudinal direction in the vicinity of the boundary with the central absorbent portion.
[Selection] Figure 1

Description

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

  In absorbent articles such as incontinence pads, the material and structure of each member have been improved to improve its function and wearing feeling. In particular, various proposals have been made regarding the leak-proof property of the liquid depending on the type and application of the absorbent article from the viewpoint of improving the wearing feeling.

  For example, Patent Document 1 discloses a disposable diaper that is worn with an auxiliary absorbent device by placing the auxiliary absorbent device on the inner surface. This disposable diaper includes an absorbent body on which the auxiliary absorber is placed. In the absorbent body, the maximum swelling rate at the time of liquid absorption of both side absorbent parts is higher than that of the central absorbent part. As a result, the liquid overflowing from the auxiliary absorbent is absorbed by the side absorbent portion to increase the thickness, and the tightening force of the thigh by the side absorbent portion is improved. Further, it is said that a low rigidity region is provided on the non-skin contact surface side of the side absorbent portion so that the side absorbent portion can be easily bent and the pressure contact with the thigh can be ensured. As a result, leakage from the crotch is effectively prevented.

  Patent Document 2 discloses an absorbent article provided in an absorbent body in a concave or slit-shaped groove. The groove portion is disposed in the front-rear direction between the center portion and both side edge portions of the absorber. Furthermore, the absorbent article has an inner three-dimensional gather and an outer three-dimensional gather on the top sheet. By prescribing the positional relationship between the two three-dimensional gathers and the grooves, urine moving along the top sheet surface can be blocked and liquid can be quickly absorbed to prevent side leakage.

JP 2003-93440 A JP 2011-156032 A

The disposable diaper of the said patent document 1 has the leak-proof property with respect to the large amount of excretion liquid which overflows from an auxiliary | assistant absorber. Moreover, the absorbent article of Patent Document 2 has improved adhesion with skin by tightening with two kinds of three-dimensional gathers in order to improve leakage prevention. However, this tightening can be a burden on the skin.
Based on the above points, the present invention can absorb liquid that flows laterally due to the wearer's movement, etc., even when the amount of excretion is small, and can retain a soft touch, dry feeling, etc. It relates to goods.

  The present invention comprises a surface sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and a liquid-retaining absorbent core disposed between the two sheets. The absorbent article has a longitudinal direction extending from the abdomen of the wearer through the crotch portion to the back side, and a transverse direction perpendicular to the longitudinal direction. , Containing a hydrophilic fiber and a water-absorbing polymer, and divided in a lateral direction into a pair of left and right side absorbent parts and a central absorbent part sandwiched between the side absorbent parts. It is arranged in the vertical direction as viewed, the basis weight of the water absorbent polymer of the side absorbent part is larger than the central absorbent part, and the basis weight (q1) of the water absorbent polymer of the side absorbent part, The ratio (q1 / q2) to the basis weight (q2) of the water-absorbing polymer of the central absorbent portion is 2 or more and 5 or less, Serial The absorbent core, the groove penetrating in the thickness direction, to provide an absorbent article which is disposed longitudinally near the boundary between the side absorbent portions and the central absorbent portion.

  Even when the amount of excretion is small, the absorbent article of the present invention can block the liquid flowing out in the lateral direction due to the wearer's movement and the like, and can maintain a soft touch, a dry feeling, and the like.

It is the partially notched perspective view which showed typically the incontinence pad as preferable one Embodiment of the absorbent article of this invention. It is sectional drawing which shows the II-II line cross section in FIG. (A) is a partial cross-sectional perspective view which shows the absorptive core before excretion, (b) is a partial cross-sectional perspective view which shows the absorptive core in which the leak-proof wall was formed in the initial stage of excretion. (A)-(c) is sectional drawing which showed typically the preferable coating form of the absorptive core by a coating sheet. (A) is the top view which showed typically the aspect by which the groove part was arrange | positioned inward rather than the boundary of a side part absorption part and a center absorption part in an absorptive core, (b) is a groove part in an absorptive core. It is a top view which shows typically the aspect made into the arrangement | positioning which overlaps with the said boundary. (A)-(f) is a top view which shows typically the modification of the arrangement | positioning relationship between a groove part and the boundary M. FIG.

  An incontinence pad as a preferred embodiment of the absorbent article according to the present invention will be described in detail below with reference to the drawings.

  In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin surface side or the skin contact surface side or the surface side, and the opposite side is referred to as the non-skin surface side or the non-skin contact surface side or the back surface side. That's it. The direction positioned on the front side of the human body when worn is referred to as the front, and its end is referred to as the front end, and the direction positioned on the rear is referred to as the rear, and the end is referred to as the rear end. The direction connecting the front end portion and the rear end portion, that is, the direction extending from the wearer's belly side portion to the back side portion via the crotch portion is referred to as the longitudinal direction (Y direction) of the absorbent article. A direction orthogonal to the vertical direction is referred to as a horizontal direction (X direction). Moreover, the normal line direction of the surface or back surface of an absorbent article is called thickness direction, and the quantity is called thickness.

  FIG. 1 shows the overall structure of the incontinence pad 10 of the present embodiment. The incontinence pad 10 is disposed between the liquid-permeable top sheet 1 disposed on the skin contact surface side, the liquid-impermeable back sheet 2 disposed on the non-skin contact surface side, and the both sheets. The liquid-retaining absorbent core 3 is provided. The absorbent core 3 is a mixed fiber containing a hydrophilic fiber 31 and a water absorbent polymer 32. The outer surface of the absorbent core 3 is covered with the covering sheet 4 to form the absorbent body 5. Further, on both the left and right sides of the incontinence pad 10, water-repellent side sheets 6 that form the standing leakage preventing walls 60 are arranged.

  The top sheet 1 is made of a liquid-permeable member that has a good touch and is made of, for example, a hydrophilic air-through nonwoven fabric. From the viewpoint of preventing liquid leakage on the non-skin contact surface side of the absorbent body 3, the back sheet 2 is made of a liquid hardly permeable member, for example, formed using a liquid impermeable porous film or the like. It is. Moreover, it is preferable to have moisture permeability from a viewpoint of prevention of swelling. The liquid poor permeability means a property that hardly allows liquid to pass through, and includes waterproofness, water repellency, and liquid impermeability.

  The incontinence pad 10 thus formed has a vertically long shape having a vertical direction (Y direction) and a horizontal direction (X direction) orthogonal to the vertical direction. When wearing the incontinence pad 10, the topsheet 1 side is directed to the wearer's skin side. Then, the incontinence pad 10 is worn with the vertical direction from the lower abdomen to the buttocks and the horizontal direction facing the direction connecting the left and right feet. At that time, the incontinence pad 10 is fixed to the clothing by the adhesive portion 22 (see FIG. 2) disposed on the non-skin contact surface side of the back sheet 2.

  The incontinence pad 10 has an excretion part corresponding region C corresponding to the excretion point of the wearer, a front part F corresponding to the lower abdomen side in front of the excretion part corresponding region C, and a rear part R corresponding to the rear hip side. . The excretory part corresponding | compatible area | region C in this embodiment is a center area | region when the incontinence pad 10 is divided into 3 area | regions to the vertical direction. As described above, the section that covers the entire excretion point of the wearer can be the excretion part corresponding region C, and can be set according to the size of the absorbent article that changes depending on the purpose of use and the like. In the case of an absorbent article having a wide rear flap that covers the buttocks, the excretory part corresponding region C is closer to the front.

  As shown in FIG. 2, the absorbent core 3 is divided into a pair of left and right side absorbent parts 36 and 36 and a central absorbent part 37 sandwiched between the side absorbent parts 36 in the lateral direction. The basis weight of the water-absorbing polymer 32 of the side absorption part 36 is made larger than that of the central absorption part 37. The boundary between the two absorption parts is indicated by a one-dot chain line in FIG. 2 with a symbol M (the same applies to other drawings). The side absorption part 36 and the central absorption part 37 are arranged in the vertical direction (Y direction) over the entire length of the absorbent core 3 in plan view. The side absorption part 36 and the central absorption part 37 have the same thickness and are flush with the skin contact surface side, or the side absorption part 36 is thinner than the central absorption part 37 and the skin contact surface side. Has been lowered. Thereby, when mounting | wearing the incontinence pad 10, the center absorption part 37 can be made to fit a body.

  Due to the difference in basis weight of the water-absorbing polymer 32 described above, the side absorbent portion 36 absorbs and retains excretory fluid such as urine mainly by the water-absorbent polymer 32 rather than the hydrophilic fiber 21 as compared with the central absorbent portion 37. . Since the water-absorbing polymer 32 swells greatly due to absorption and retention of the liquid, the side absorption part 36 containing a large amount of the water-absorbing polymer 32 becomes bulkier than the central absorption part 37 due to absorption of urine and the like (FIG. 3 (a) → (B)). Thereby, the side part absorption part 36 turns into the breakwater 7 with a height with respect to the center absorption part 37. FIG. The height of the breakwater 7 can prevent the liquid from flowing out laterally on the skin contact surface side of the absorbent core 3. Moreover, in the inside of the breakwater 7, the water-absorbing polymer 32 becomes a gel by swelling and fills the gap inside the side absorption part 32, so that the breakwater 7 gel blocks the liquid moving inside. Even if there is a slight gap and the liquid permeates there from, a large amount of the water-absorbing polymer 32 can absorb and hold the liquid and be immobilized. In this way, the breakwater 7 can prevent subsequent lateral leakage of the liquid. Since the water-absorbing polymer 32 having the above action is a mixed fiber with the hydrophilic fiber 31, the arrangement of the water-absorbing polymer 32 in the side absorbent portion 36 is stable, and the presence of a space between the fibers causes swelling. The degree of freedom is ensured and it is easy to be a suitable leakage breaker 7, which is preferable.

  Further, in the incontinence pad 10, a groove portion 8 penetrating in the thickness direction is disposed in the vertical direction in the vicinity of the boundary M between the side absorbent portion 36 and the central absorbent portion 37 in the absorbent core 3. The boundary M is also an inner side part of the side part absorption part 36. This groove portion 8 can reliably catch the liquid received in the excretory body region C of the absorbent core 3 and efficiently carry it to the entire side absorption portion 36 without waste (see FIG. 3B). In particular, during the first excretion, the absorbent core 3 is dry, so that the liquid quickly diffuses and easily reaches the boundary M. By utilizing this, the groove portion 8 in the vicinity of the boundary M can quickly catch excretion fluid such as urine and can send it preferentially to the entire longitudinal direction of the side absorption portion 36. Even if the excretion amount is small at the initial stage of excretion, the leakage barrier 7 is quickly formed over the entire length of the side absorption part 36 by the cooperation of the side part absorption part 36 and the groove part 8 in the vicinity thereof. obtain. The initial stage of excretion is when the excretion amount is 30 ml. Moreover, the formation of the leak-proof lantern 7 means that the difference in height between the central absorbent portion 37 and the side absorbent portion 36 is 2 mm or more after 2 minutes have passed since the first injection according to the test method described later. Say. For example, 30 ml is sufficient as the amount of excretion in which the leakage breakwater 7 is formed, which is much smaller than 150 ml of general urination for adults. This is suitable for an incontinence pad that repeatedly receives a small amount of urination. On the contrary, since the breakwater 7 is formed at the initial stage of excretion, it can be applied to a disposable diaper that receives a large amount of liquid at a time.

Thus, the breakwater 7 is quickly formed in the initial stage of excretion by the cooperation of the side absorption part 36 and the groove part 8. Therefore, it is possible to prevent side leakage by quickly responding to further excretion and excretion in a larger amount than usual at the first time (see FIG. 3B). Moreover, since the breakwater 7 can be formed over the entire longitudinal direction of the absorbent core 3 due to the diffusion of the liquid in the groove portion 8, it is possible to prevent the liquid from being transferred even in a portion other than the excretory portion corresponding region C. In particular, liquid flow may occur in various parts of the incontinence pad 10 due to changes in the wearer's movement and posture, but the leakage barrier 7 having a height in the vertical direction also effectively prevents liquid leakage. Can be prevented.
On the other hand, the urine or the like diffused in the vertical direction along the groove 8 is absorbed and held by the front portion F or the rear portion R of the central absorbent portion 37 while being prevented from spreading in the lateral direction by the leakage barrier 7. That is, the groove portion 8 can promote the formation of the leakage barrier 7 in the initial stage of excretion and can promote the absorption and retention of the liquid by effectively utilizing the entire central absorption portion 37. This can greatly reduce the amount of liquid that can move in the lateral direction and improve leakage resistance. Moreover, since the groove part 8 is a groove | channel penetrated in the thickness direction, the liquid which transfers to a horizontal direction can be dropped into a groove bottom part, and the flow of a liquid can be interrupted | blocked. This itself can also stop the momentum of the liquid reaching the breakwater 7 and contribute to leakage prevention.

Moreover, since the breakwater 7 has protruded to the skin contact surface side rather than the center absorption part 37, it becomes a part which touches a wearer's skin. Thereby, the center absorption part 37 and the groove part 8 form the hollow enclosed by skin and a pair of leak-proof dams 7 and 7, and also it becomes difficult for a liquid to transfer to a horizontal direction.
On the other hand, the skin contact surface side becomes uneven as the absorbent core 3 as a whole due to the rise of the breakwater 7. However, in the breakwater 7, the water-absorbing polymer 32 is soft and elastic because the water-absorbing polymer 32 retains the liquid inside and forms a gel. Due to this characteristic, even if the skin contact surface side is uneven, the fit property is hardly disturbed, and the uncomfortable feeling at the time of wearing can be alleviated. As described above, the incontinence pad 10 is preferable because it has no hardness compared to the case where the side portion of the absorbent body is increased in volume by fibers or the like from the beginning. Further, the liquid absorption and retention by the water-absorbing polymer 32 is higher than that by the hydrophilic fiber, and the liquid does not easily flow out even under body pressure. Thereby, even when the leakage breaker 7 is in contact with the skin, adhesion to the skin and liquid leakage due to liquid return hardly occur. As a result, the incontinence pad 10 can maintain good wearing comfort such as soft touch and dry feeling while improving leakage resistance.

  The ratio (W2 / W3) between the lateral width (W2) of the side absorbent portion 36 that becomes the leakage breaker 7 and the lateral width (W3) from the center line CL to the boundary M of the central absorbent portion 37 is 1 / 7 or more is preferable, and 1/6 or more is more preferable. Thereby, a side part absorption part does not leave | separate too much from a center absorption part, but can let a liquid flow through a side part absorption part effectively. The upper limit of the ratio (W2 / W3) is preferably 1/4 or less, and more preferably 1/5 or less. Thereby, it can be said that a side part absorption part is not too large and can absorb to the outer end part of a side part absorption part.

Regarding the basis weight difference described above, the ratio (q1 / q2) of the basis weight (q1) of the water absorbent polymer 32 of the side absorbent portion 36 to the basis weight (q2) of the water absorbent polymer 32 of the central absorbent portion 37 is 2 or more. 5 or less. Since the basis weight of the water-absorbing polymer 32 of the side absorbent part 36 is more than twice that of the central absorbent part 37, the side absorbent part 36 is sufficiently high with respect to the central absorbent part 37. Can be formed. From this viewpoint, the basis weight ratio (q1 / q2) is more preferably 2 or more, and further preferably 2.5 or more. On the other hand, since the basis weight of the water-absorbing polymer 32 of the side absorbent part 36 is 5 times or less with respect to the central absorbent part 37, the side absorbent part 36 does not have an excessive levee height, There is not too much space between the skin. Thereby, it is hard to produce the liquid leak from the front-back direction edge part. In this respect, the basis weight ratio (q1 / q2) is more preferably 3 or less.
The center absorbent portion 37 of the incontinence pad 10 preferably has a basis weight of hydrophilic fibers of 100 g / m ² or more and 250 g / m ² or less. The basis weight (q2) of the water-absorbing polymer 32 of the central absorbent portion 37 is preferably 100 g / m ² or more and 250 g / m ² or less. The basis weight of the entire central absorbent portion 37 is preferably 200 g / m ² or more and 500 g / m ² or less.
The side absorption part 36 of the incontinence pad 10 preferably has a basis weight of hydrophilic fibers of 100 g / m ² or more and 250 g / m ² or less. The basis weight (q1) of the water-absorbing polymer 32 of the side part absorption part 36 is preferably 100 g / m ² or more, and more preferably 250 g / m ² or more. Further, from the viewpoint of suppressing liquid leakage due to the gap between the skin of the wearer and the viewpoint of preventing the side absorption part 36 from collapsing when swollen because the water-absorbing polymer 32 is excessive, the side absorption part The upper limit of the basis weight (q1) of the 36 water-absorbing polymer 32 is preferably 750 g / m ² or less, and more preferably 650 g / m ² or less. The basis weight of the entire side absorption part 36 is preferably 300 g / m ² or more, and more preferably 500 g / m ² or more. The upper limit of the side absorbent portions 36 total basis weight is preferably 1000 g / ^{m 2} or less, more preferably 750 g / ^{m 2} or less.

(Measurement method of basis weight)
The boundary M between the side absorption part 36 and the central absorption part 37 can be found by means of saturated water absorption of the absorbent core 3 shown below. That is, in the absorbent core 3 after the saturated water absorption, a portion having a difference in height is the boundary M.
A portion corresponding to the found boundary M is cut from the dry absorbent core 3. Thereby, the side part absorption part 36 and the center absorption part 37 can be isolate | separated. Next, the respective areas of the separated side absorption part 36 and the central absorption part 37 are measured, and the weight (a) is measured. Then, the side absorption part 36 and the central absorption part 37 are each enclosed in a mesh bag and immersed in an aqueous solution of ascorbic acid and riboflavin overnight. And each absorption part 36 and 37 is exposed to sunlight with the bag made from a mesh soaked. Thereafter, the mesh bag is washed with water, and the weight of the bag contents is measured (b). Here, since a is the total weight of pulp and polymer and b is the weight of pulp, the polymer weight can be calculated by ab. And basic weight is measured from this polymer weight and the area of each absorption part 36,37.

  In the above content ratio, the difference in height between the side absorbent part 36 and the central absorbent part 37 is preferably 4 mm or more and more preferably 5 mm or more in a state where the water-absorbing polymer 32 absorbs saturated water. By taking more than the said lower limit, the liquid which flows by the skin contact surface side of the absorptive core 3 can be protected reliably. On the other hand, the upper limit is preferably 10 mm or less, and more preferably 7 mm or less. By setting it as the said upper limit or less, the liquid leak by the clearance gap between a wearer's skin can be suppressed. The saturated water absorption state is a state in which each water-absorbing polymer has absorbed water to the maximum extent, and the saturated water absorption amount is an amount measured according to JIS K 7223 (1996).

(Measurement method of the height of the side absorption part 36 and the center absorption part 37 at the time of saturated water absorption)
Using a laser digital thickness measuring instrument manufactured by KEYENCE, a metal disk having a weight of 2.5 g and a radius of 12.5 mm is placed on the absorbent core 3 that has been saturated and absorbed, and measurement is performed.

  The leakage barrier 7 formed over the longitudinal direction is preferably formed over the entire length of the absorbent core 3 from the viewpoint of leakage prevention, but absorbs at least the excretory part corresponding region C. The total length of the core 3 is preferably 80% or more, and more preferably 90% or more.

Further, even if a small amount of urine or the like diffused in the groove 8 is used to efficiently form the leakage barrier 7, the non-skin contact surface side of the side absorption portion 36 is closer to the non-skin contact surface side. It is preferable that a large amount of the water-absorbing polymer 32 is disposed on the bottom portion 36A (see FIG. 2). Further, in order to positively take in a small amount of urine or the like into the bottom portion 36A of the side absorption portion 36, the hydrophilic sheet covers the groove 8 and the non-skin contact surface side of the side absorption portion 36, and further the side portions. It is preferable to wind up to the outer side surface 36 </ b> B of the absorbing portion 36. As shown in FIG. 2, the hydrophilic sheet may be a covering sheet 4, or a sheet different from the covering sheet 4 may be provided. When the covering sheet 4 is used, for example, the covering method as shown in FIGS. 4A to 4C is preferable without any breaks in the sheet.
In addition, it can be analyzed by the following means that more water-absorbing polymers 32 are arranged in the bottom portion 36A on the non-skin contact surface side than on the skin contact surface side. First, the absorbent core 3 is cut in a dry state, and a copper sulfate aqueous solution or an iron lactate aqueous solution is injected. Thereby, it is possible to color only the water-absorbing polymer 32 without swelling. Thereafter, the cut surface is photographed with a digital camera, the area of the polymer particles in the image is calculated, and the density of the polymer particles in the thickness direction is calculated.

  In order to make the above-mentioned action by the groove portion 8 as described above more effective, the portion of the covering sheet 4 located on the skin contact surface side of the groove portion 8 is open or depressed toward the non-skin surface side. It is preferable that they are joined together. Thereby, not only the skin contact surface side of the absorbent core 3 but also the liquid flowing on the covering sheet 4 corresponding to the skin contact surface side of the absorbent body 5 can be captured and dropped and diffused. Moreover, the level | step difference of the breakwater 7 and the center absorption part 37 will be formed also as the absorber 5 including the coating sheet 4, and it is effective in prevention of the side leakage of a liquid.

Next, a preferable arrangement of the groove 8 will be described.
The lateral width (W6, see FIG. 2) of the groove 8 is preferably 2 mm or more. Thereby, the liquid introduction path can be secured without the groove portion 6 being completely blocked by the swelling of the water absorbent polymer 32 in the side portion absorption portion 36. From this viewpoint, it is more preferably 3 mm or more. On the other hand, the upper limit is preferably 7 mm or less. Thereby, it becomes easy to send out the diffused liquid to the side part absorption part 36. From this viewpoint, it is more preferably 5 mm or less. The groove 8 preferably has no constituent material of the absorbent core 3 (such as the hydrophilic fiber 31 and the water-absorbing polymer 32) from the viewpoint of liquid diffusibility at the above-mentioned preferable groove width (W6). Not limited to this, some contamination is allowed to such an extent that a liquid diffusion path can be secured.
The lateral width (W6) of the groove 8 is measured in a dry state where the absorbent core 3 is unused. Moreover, when the base groove width (W6) is not uniform in the thickness direction of the absorbent core 3, it is preferable that the above values are obtained at the narrowest and widest places.

The vicinity of the boundary M where the groove portion 8 is disposed (that is, the vicinity of the inner end portion of the side absorption portion 36) means that the above-described groove portion 8 accurately captures excretion fluid such as urine and the like to the entire side absorption portion 36. This is an area that can be preferentially sent. It is preferable that the arrangement be as close as possible to the lateral center line CL of the absorbent core 3 and not too far from the boundary M (that is, the inner end of the side absorbent portion 36).
As shown in FIG. 5A, the limit position when the groove 8 is separated from the boundary M is a separation distance between the boundary M and the laterally outer end 81 of the groove 8 on the center line CL side with respect to the boundary M. Is preferably less than 10 mm. By setting it to the upper limit value or less, the excretory liquid diffused by the groove portion 8 can be suitably fed into the side absorption portion 36. This point will be described in more detail with reference to FIGS. 2 and 5A. First, with respect to the width W1 from the lateral center line CL of the absorbent core 3 to the left end, the width W2 of the side absorbent portion 36, W3 of the central absorbent portion 37 (half of the entire width of the central absorbent portion 37), The width 8 of the groove 8 is shown. Further, the separation distance between the boundary M and the laterally outer end 81 of the groove 8 is indicated as W4, and the distance from the center line CL to the laterally outward end 81 of the groove 8 is indicated as W5. In this case, the separation distance between the boundary M and the laterally outer end 81 of the groove 8 is indicated as (W4 = (W3-W5)). The upper limit of W4 is preferably less than 10 mm (W4 = (W3−W5) <10 mm).
On the other hand, as a limit position at which the groove 8 is separated from the lateral center line CL, as shown in the cross-sectional view of FIG. 5B, the groove 8 is not separated from the boundary M (W4 = 0), It is a case where it enters into the absorption part 36, Comprising: It is preferable that it is the arrangement | positioning (-W6 <(W3-W5)) where the groove part 8 overlaps with the boundary M. FIG. This overlapping arrangement does not include the groove 8 being separated from the boundary M outside the boundary M. Thereby, excretory fluids, such as urine, can be taken in correctly and immediately sent to the side part absorption part 36. FIG. When the width (W6) of the groove 8 is not constant along the vertical direction in plan view of the absorbent core 3, the widest portion is used as a reference. Further, when the laterally outer end 81 of the groove 8 is not parallel to the boundary M and the separation distance (W4) is not constant along the vertical direction, the most separated portion is used as a reference. Further, when the laterally outward end 81 of the groove 8 is not parallel to the boundary M and (W3−W5) is not constant, (−W6 <(W3−W5)) is based on the place where (W5) is the largest. To do. When the laterally outer end 81 of the groove 8 is not parallel to the boundary M, a portion having a separation distance (W4) and a separation distance (W4) = 0 and (−W6 <(W3−W5)) May co-exist.

  Furthermore, in order for the groove part 8 to take in excretion fluid quickly, the separation distance (W7) between the center line CL of the absorbent core 3 and the lateral inner end 82 of the groove part 8 is preferably 30 mm or less, and more preferably 25 mm or less. On the other hand, the upper limit is preferably 15 mm or more and more preferably 20 mm or more in order to prevent liquid leakage due to excessive uptake and not to impair the absorption holding performance of the central absorbent portion 37. This separation distance (W7) does not need to be constant in the vertical direction, and is preferably set at the central position in the vertical direction of the excretory part corresponding region C from the viewpoint of taking in excreted liquid quickly and without waste.

  Moreover, it is preferable that the groove part 8 is more than the length of the center 3 division when the longitudinal direction length of the absorptive core 3 is equally divided into 5 in planar view of the absorptive core 3. FIG. Thereby, the breakwater 7 which the side part absorption part 36 makes becomes sufficient length. On the other hand, the upper limit is preferably within 80% of the longitudinal length of the absorbent core 3. Thereby, urine etc. diffused in the vertical direction can be prevented from leaking out from the front and rear end sides of the absorbent core 3.

Other preferable arrangements of such groove portions 8 include, for example, arrangements as shown in FIGS.
The form in which the groove portion is closer to the end in the width direction as it goes to the one end side in the vertical direction is preferable because a firm leak-proof wall can be formed in the flange portion. Specifically, it is FIG. 6 (a) and (b).
The mode in which the central portion in the longitudinal direction of the groove is closest to the center line CL is preferable because the liquid can be more easily captured and easily flowed in the width direction. Specifically, FIG. 6C, FIG. 6D, and FIG. 6E.
In addition to the groove part 8, the form which further has a groove | channel on the centerline CL is preferable from the reason that a liquid flows easily in a longitudinal direction and the width direction. Specifically, FIG. 6 (f) and (g).

  The groove 8 in FIG. 6A is not parallel to the boundary M but has a shape that enters inward from the front portion F toward the rear portion R. Thereby, the leak-proof wall 7 is rapidly formed in the front part F, and especially the leak-proof property suitable for men is obtained. In this case, the A1 point is a reference point for determining the range of (W4 = 0 and -W6 <(W3-W5)), and the A2 point is a reference point for determining the range of (W4 = (W3-W5) <10 mm). Become. In this case, a slight separation distance (W4) occurs. Further, the point A3 is a reference point for determining the distance (W7) between the center line CL and the laterally inner end 82 of the groove 8.

  The groove 8 in FIG. 6B is a combination of a rectangular portion positioned laterally outward in the front portion F and a rectangular portion positioned laterally inward in the rear portion R. The groove portion 8 is formed as a step in the excretion portion-corresponding region C by shifting the arrangement of the two. As a result, it is easy to diffuse the liquid from the A3 point where there is a step to the rear portion R side, and it is easy to form a firm leak-proof wall 7 around the collar portion. As a result, a leak-proof property particularly suitable for women can be obtained. In this case, the A1 point is a reference point for determining the range of (W4 = 0 and -W6 <(W3-W5)), and the A2 point is a reference point for determining the range of (W4 = (W3-W5) <10 mm). Become. In this case, a slight separation distance (W4) occurs. Further, the point A3 is a reference point for determining the distance (W7) between the center line CL and the laterally inner end 82 of the groove 8.

  The groove part 8 of FIG.6 (c) is the shape curved to the horizontal direction centerline CL side in the vertical direction center. As a result, it is possible to catch the excretion liquid quickly and efficiently at the A3 point closest to the center line CL, and to form the vertical leakage barrier 7 around the excretion part corresponding region C. In this case, the A1 point crosses the boundary M and enters the side absorption part 36 most, and becomes a reference point for determining the range of (W4 = 0 and −W6 <(W3−W5)). Further, the point A2 is closer to the center line CL than the boundary M, and serves as a reference point for determining the range of (W4 = (W3-W5) <10 mm). In this example, the laterally outer end 81 of the groove 8 and the boundary M overlap (W4 = 0), which is preferable. Further, the point A3 is the reference point for determining the distance (W7) between the center line CL and the laterally inner end 82 of the groove 8 when the laterally inner end 82 of the groove 8 is closest to the centerline CL. .

  The groove 8 in FIG. 6D has a rhombus shape with a central portion in the vertical direction pointed in the horizontal direction. Thereby, the excretory fluid can be caught quickly and efficiently at the point A3, and the leakage barrier 7 can be formed evenly in the vertical direction. In this case, the A1 point is a reference point for determining the range of (W4 = 0 and -W6 <(W3-W5)), and the A2 point is a reference point for determining the range of (W4 = (W3-W5) <10 mm). Become. In this case, a slight separation distance (W4) occurs. Further, the point A3 is a reference point for determining the distance (W7) between the center line CL and the laterally inner end 82 of the groove 8.

  The groove 8 in FIG. 6 (e) has a rectangular shape along the longitudinal direction so as to be parallel to the boundary M on the inner side of the boundary M. Furthermore, it has the convex part 83 protruded toward the part (The central part of a vertical direction and a horizontal direction in FIG.4 (g)) which is easy to receive the liquid of the excretion part corresponding | compatible area | region C directly. With this convex part 83, excretion fluid such as urine can be quickly captured. Moreover, the overall width of the groove 8 can be reduced so that the distance from the boundary M is not excessively widened. This is preferable because the excretion fluid can be quickly and efficiently delivered to the side absorption portion 36. In this case, the A2 point is a reference point for determining the range of (W4 = (W3-W5) <10 mm). Further, the point A3 is a reference point for determining the distance (W7) between the center line CL and the laterally inner end 82 of the groove 8.

  The groove 8 in FIG. 6F has a rectangular shape along the vertical direction, and is arranged so as to overlap the boundary M. Further, another groove portion 88 is formed in the vicinity of the horizontal center line CL. The groove 88 is not included in the groove disposed in the vicinity of the boundary M. Since the groove portion 88 diffuses in the vertical direction before the liquid reaches the groove portion 8, the liquid easily reaches the entire groove portion 8. Thereby, the breakwater 7 can be quickly and uniformly formed in the vertical direction. In this case, the A1 point is a reference for determining the category of (W4 = 0 and -W6 <(W3-W5)). Further, the point A3 is a reference point for determining the distance (W7) between the center line CL and the laterally inner end 82 of the groove 8.

  The groove 8 in FIG. 6G is the same as that in FIG. Further, three horizontally long grooves 89 are intermittently arranged in the vertical direction along the horizontal center line CL. As a result, lateral diffusion near the center line Cl is performed at a plurality of points in the vertical direction, the liquid supply to the groove portion 8 is uniformly performed in the vertical direction, and the leakage breaker 7 is quickly and uniformly formed in the vertical direction. obtain. In this case, the A1 point is a reference for determining the category of (W4 = 0 and -W6 <(W3-W5)). Further, the point A3 is a reference point for determining the distance (W7) between the center line CL and the laterally inner end 82 of the groove 8.

Next, the preferable forming material of the member used for the absorbent article of the present invention will be described.
As a material for forming the top sheet 1, the back sheet 2, the absorbent core 3, the covering sheet 4, and the side sheet 6, those employed for this type of article can be used without particular limitation.

  For example, the surface sheet 1 is preferably a hydrophilic thermal bond nonwoven fabric from the viewpoint of promptly absorbing excreted bodily fluid and transmitting it to the absorbent body and from the viewpoint of good touch, and particularly preferably an air-through nonwoven fabric. The surface layer 1 is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.

  The back sheet 2 is not particularly limited as long as it has waterproofness and moisture permeability. For example, a minute inorganic filler made of a hydrophobic thermoplastic resin and calcium carbonate, or an incompatible organic polymer. And the like, and a porous film obtained by uniaxially or biaxially stretching the film. Examples of the thermoplastic resin include polyolefin. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.

Examples of the hydrophilic fibers 31 constituting the absorbent core 3 include natural fibers such as wood pulp, cotton and hemp, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, and polyvinyl alcohol resins. Single fibers made of synthetic resins, composite fibers containing two or more of these resins, and semi-synthetic fibers such as acetate and rayon can be used. When using a fiber made of a synthetic fiber, the fiber may be a heat-shrinkable fiber whose shape changes due to heat. For example, the fineness is increased by heat but the fiber length is shortened, and the fineness is hardly changed by heat, but the length occupied by the apparent fiber is shortened by changing the shape to a coil shape. Also good.
As the water-absorbing polymer 32, various polymer materials usually used for this type of article can be used. The water-absorbing polymer 32 is preferably a superabsorbent polymer compound having a performance capable of absorbing and retaining water or physiological saline 20 times or more of its own weight.

  The covering sheet 4 is a hydrophilic member, for example, thin paper (thin paper) such as hydrophilic tissue paper, crepe paper, non-woven fabric made of hydrophilic fibers such as cotton and rayon, and synthetic resin fibers. A non-woven fabric formed by treatment, for example, an air-through non-woven fabric, a point bond non-woven fabric, a spunlace non-woven fabric, a spunbond non-woven fabric, a spunbond-meltblown-spunbond (SMS) non-woven fabric or the like can be used.

  The side sheet 6 is preferably a water-repellent non-woven fabric, and is water-repellent from among non-woven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, heat roll nonwoven fabrics, needle punched nonwoven fabrics manufactured by the card method. Various non-woven fabrics treated with water can be used. Particularly preferably, for example, a spunbond nonwoven fabric, a spunbond-meltblown (SM) nonwoven fabric, a spunbond-meltblown-spunbond (SMS) nonwoven fabric, or the like is used.

  The absorbent article of the present invention is not limited to the incontinence pad of the above embodiment, and can be applied to, for example, sanitary napkins, panty liners, disposable diapers, urine pads and the like. In particular, the absorbent article of the present invention can be suitably applied to various absorbent articles because the leakage barrier is formed with a smaller amount of liquid than the normal adult urine output. Further, the excretory fluid is not limited to urine, and it is possible to suitably prevent a highly viscous product such as menstrual blood and various lateral excretory fluids. In addition to the top sheet 1, the absorbent body 3, and the back sheet 2, members may be appropriately incorporated as constituent members of the absorbent article according to applications and functions.

  This invention discloses the following absorbent articles and its manufacturing method further regarding embodiment mentioned above.

<1> A front sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and a liquid-retaining absorbent core disposed between the two sheets. The absorbent article has a longitudinal direction extending from the abdominal side of the person through the crotch part to the back side, and a direction perpendicular to the longitudinal direction being a lateral direction,
The absorbent core contains a hydrophilic fiber and a water-absorbing polymer, and is divided into a pair of left and right side absorbent parts and a central absorbent part sandwiched between the side absorbent parts in the lateral direction. The part absorption part is arranged in the vertical direction in plan view,
The basis weight of the water absorbent polymer of the central absorbent portion is larger than the weight of the water absorbent polymer of the side absorbent portion, and the basis weight of the water absorbent polymer of the side absorbent portion (q1). The ratio (q1 / q2) to (q2) is 2 or more and 5 or less,
In the absorbent core, an absorbent article in which a groove portion penetrating in the thickness direction is disposed in a vertical direction in the vicinity of a boundary between the side absorbent portion and the central absorbent portion.

<2> The absorbent article according to <1>, wherein the groove has a lateral width of 2 mm or more, preferably 3 mm or more.
<3> The absorbent article according to <1> or <2>, wherein the lateral width of the groove is 7 mm or less, preferably 5 mm or less.
<4> The absorbent article according to <2> or <3>, wherein the groove width in the lateral direction of the groove portion is 2 mm or more and 7 mm or less.
<5> On the skin contact surface side of the absorbent core, the side absorption part and the central absorption part are flush with each other, or the side absorption part is lower than the central absorption part, and excretion The absorbent article according to any one of <1> to <5>, wherein the entire side absorbent portion is raised at an initial stage to become a leak-proof wall and become higher than the central absorbent portion.
<6> The absorbent article according to <5>, wherein the height difference between the leakage breaker and the central absorbent portion is 4 mm or more, preferably 5 mm or more in a state where the water-absorbing polymer has saturated water absorption. .
<7> The height difference between the breakwater and the central absorbent portion is 10 mm or less, preferably 7 mm or less, preferably <5> or <6>, in a state where the water-absorbing polymer has saturated water absorption. Absorbent articles.
<8> The absorbent article according to any one of <5> to <7>, wherein a height difference between the leakage breaker and the central absorbent portion is 4 mm or more and 10 mm or less.
<9> The groove is arranged so as to overlap a boundary between the side absorption part and the central absorption part, or a separation distance between the boundary and the laterally outer end of the groove is within 10 mm, preferably The absorbent article according to any one of <1> to <8>, wherein the absorbent article is disposed closer to the center in the lateral direction than the boundary.
<10> The water-absorbing polymer contained in the side absorption part is disposed more on the non-skin contact surface side than on the skin contact surface side, and any one of <1> to <9>. Absorbent articles.
<11> The hydrophilic core is disposed on the absorbent core so as to cover the non-skin contact surface side of the groove portion and the side portion absorbing portion, and further wound up to the side surface of the side portion absorbing portion. The absorbent article according to any one of> to <10>.
<12> The ratio (W2 / W3) between the lateral width (W2) of the side absorbent portion and the lateral width (W3) from the center line to the boundary of the central absorbent portion is 1/7 or more, preferably 1 / The absorbent article according to any one of <1> to <11>, which is 6 or more.
<13> The ratio (W2 / W3) of the lateral width (W2) of the side absorbent portion to the lateral width (W3) from the center line to the boundary of the central absorbent portion is ¼ or less, preferably 1 / The absorbent article according to any one of <1> to <12>, which is 5 or less.
<14> The ratio (q1 / q2) of the basis weight (q1) of the water-absorbing polymer of the side absorption part to the basis weight (q2) of the water-absorbing polymer of the central absorption part is 2 or more, preferably The absorbent article according to any one of <1> to <13>, which is 2.5 or more.
<15> The ratio (q1 / q2) of the basis weight (q1) of the water-absorbing polymer of the side absorption part to the basis weight (q2) of the water-absorbing polymer of the central absorption part is 5 or less, preferably The absorbent article according to any one of <1> to <14>, which is 3 or less.
<16> The breakwater is at least 80%, preferably 90% or more of the total length of the absorbent core centered on at least the excretory part-corresponding region, preferably any one of <1> to <15> Absorbent article.
<17> The distance between the center line of the absorbent core and the laterally inner end of the groove is 30 mm or less, and preferably 25 mm or less, according to any one of <1> to <16>. Absorbent article.
<18> The separation distance between the center line of the absorbent core and the laterally inner end of the groove is 15 mm or more, preferably 20 mm or more. <1> to <17> Absorbent article.
<19> The groove portion has a length equal to or more than the length of three central sections when the longitudinal length of the absorbent core is divided into five equal parts in a plan view of the absorbent core. <1> to <18> The absorbent article according to any one of the above.
<20> The absorbent article according to any one of <1> to <19>, wherein the groove is within 80% of a longitudinal length of the absorbent core in a plan view of the absorbent core.
<21> The absorbent core is provided with a hydrophilic sheet that covers the non-skin contact surface side of the groove portion and the side portion absorbing portion and is further wound up to the side surface of the side portion absorbing portion <1. The absorbent article according to any one of> to <20>.
<22> The absorbent article according to any one of <1> to <21>, wherein the absorbent article is an incontinence pad.
<23> The absorbent article according to any one of <1> to <22>, wherein the groove is closer to the end in the width direction as it goes to one end in the vertical direction.
<24> The absorbent article according to <23>, wherein the groove is shaped to enter inward from the front part toward the rear part.
<25> The absorbent article according to <23>, wherein the groove is a combination of a rectangular portion positioned laterally outward in the front portion and a rectangular portion positioned laterally inward in the rear portion.
<26> The absorbent article according to any one of <1> to <22>, wherein a central portion in the longitudinal direction of the groove is closest to the center line.
<27> The absorbent article according to <26>, wherein the groove is curved in the center in the vertical direction toward the center line in the horizontal direction.
<28> The absorbent article according to <26>, wherein the groove has a rhombus shape with a central portion in the vertical direction sharpened in the horizontal direction.
<29> The groove is a rectangular shape along the longitudinal direction so as to be parallel to the boundary M on the inner side of the boundary M, and further includes a convex portion protruding toward the excretion part corresponding region. The absorbent article as described.
<30> The absorbent article according to any one of <1> to <22>, further including a groove on the center line in addition to the groove.
<31> The absorbent article according to <30>, wherein the groove is a rectangular shape along the vertical direction and is arranged to overlap the boundary, and further, another groove is formed in the vicinity of the center line in the horizontal direction.
<32> The groove portion has a rectangular shape along the vertical direction and is arranged so as to overlap the boundary, and further, the horizontally long groove portion is intermittently arranged in the vertical direction along the horizontal center line. Absorbent articles.
<33> The absorptivity according to any one of <1> to <32>, wherein a basis weight (q2) of the water-absorbing polymer of the central absorbent portion is 100 g / m ² or more and 250 g / m ² or less. Goods.
<34> The basis weight (q1) of the water-absorbing polymer of the side absorption part is 100 g / m ² or more, preferably 250 g / m ² or more, according to any one of <1> to <33>. Absorbent articles.
<35> The basis weight (q1) of the water-absorbing polymer of the side absorption part is 750 g / m ² or less, preferably 650 g / m ² or less, according to any one of <1> to <34>. Absorbent articles.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not construed as being limited thereto.

Example 1
The absorptive core made into the mixed fiber body of the hydrophilic fiber (NB416L1000W by a ware-hauser company) and a water absorbing polymer (Nippon Shokubai Co., Ltd. CAW151) was obtained by the conventional method. At that time, the hydrophilic fiber is first deposited on the stacking drum, and then the absorbent polymer and the hydrophilic fiber are deposited so that the amount of the water-absorbing polymer on the other surface side is larger than the one surface side. In addition, a mixed fiber was obtained. A mixed fiber having a basis weight of hydrophilic fibers of 150 g / m ² and a basis weight (q2) of the water-absorbing polymer of 157 g / m ² was cut to a width of 44 mm to form a central absorbent portion. In addition, the mixed fiber having a basis weight of hydrophilic fibers of 150 g / m ² and a basis weight (q1) of the water-absorbing polymer of 450 g / m ² was cut into a width of 11 mm, respectively, to form side absorbent parts. . The basis weight ratio (q1 / q2) was about 2.9 times.
Then, the side part absorption part and the center absorption part were arrange | positioned so that it might become a groove part with a width of 2 mm. At this time, the separation distance (W4) between the laterally outer end of the groove and the boundary between the side absorbent portion and the central absorbent portion of the absorbent core was set to 0 mm. The length of the groove portion in the vertical direction was 18 cm. The longitudinal length of the absorbent core was 24 cm. Therefore, the longitudinal length of the groove portion was 75% of the longitudinal length of the longitudinal length of the absorbent core. At this time, the thicknesses of the side absorption part and the central absorption part were both 4 mm, and were flush with the skin contact surface side.
Next, the absorbent core is covered with a covering sheet (sheet having a basis weight of 16 g / m ² obtained by making paper with hydrophilic pulp) so as to be rolled up from the lower surface side to the upper surface side, and bonded and fixed on the upper surface side. Got.
The absorbent body thus obtained was incorporated into a liquid-permeable top sheet and a liquid-impermeable back sheet to obtain a sample S1 of an incontinence pad.

(Comparative Example 1)
In the comparative example, an incontinence pad sample c1 was obtained in the same manner except that no groove was formed in the example.

(Test method)
Each sample product is placed on a flat surface with the skin contact surface side facing up, and the first artificial urine (urea: 1.9%, sodium chloride: 0. 8%, magnesium sulfate heptahydrate: 0.1%, calcium chloride hydrate: 0.1%, potassium sulfate: 0.1%, Emulgen 130K: 0.1%, red No. 2: 0.1 %, Ion-exchanged water: 96.8%) was injected at a rate of 5 g / sec from a height of 3 cm and 30 ml. At this time, the measurement was performed through a tube having an inner diameter of 4 mm by using a device of a liquid discharge pump with a degree adjusting function.
Then, 2 minutes after the injection, 30 ml of the second artificial urine was injected in the same manner as the first time.
In this test, in the first liquid injection, the degree of swelling of the side absorption part and the central absorption part was measured to confirm the formation of a leakage barrier. Furthermore, the liquid diffusion region was confirmed by the second liquid injection. At the same time, the presence or absence of side leakage of the liquid was confirmed.

(Formation of a breakwater due to the first injection of liquid)
○: The liquid effectively passed through the side absorption part, and the side absorption part swelled uniformly in the longitudinal direction.
(Triangle | delta): Although the side part absorption part swelled, the side part absorption part did not swell uniformly with respect to a longitudinal direction.
X: The side absorption part did not swell.
(The state of liquid absorption retention in the front and rear regions of the central absorption part at the time of the second liquid injection)
○: The liquid was absorbed in the region before and after the central absorption part where the liquid did not reach during the first absorption.
(Triangle | delta): It absorbed only in a few parts of the front and back area | region of the center absorption part which the liquid has not reached at the time of 1st absorption.
X: It was not absorbed in the region before and after the central absorption part where the liquid did not reach during the first absorption.

As is clear from the results shown in Table 1, Example 1 swelled with a thickness of 3.5 times from 4 mm to 14 mm at the time of drying in the side absorption part. Moreover, this became twice the thickness with respect to 7 mm in thickness by swelling of a center absorption part. On the other hand, in Comparative Example 1, the leakage barrier was not sufficiently formed and the height was insufficient. Thereby, it was found that the sample s1 of the incontinence pad of Example 1 was able to quickly and surely form a breakwater as compared with the comparative example.
Further, in the second liquid addition, the liquid in Example 1 was able to absorb and hold the liquid in a wider range at the front and rear ends of the central absorbent portion than in Comparative Example 1. Thereby, compared with the comparative example 1, it turned out that Example 1 can carry out liquid absorption holding | maintenance using a center part absorption part by cooperation of a groove part and a breakwater. Furthermore, it was confirmed that the sample c1 of the example had no liquid leakage from the lateral direction. This can be understood to be due to a breakwater.

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorbent core 31 Hydrophilic fiber 32 Water-absorbing polymer 36 Side part absorption part 37 Center absorption part 4 Cover sheet (hydrophilic sheet)
5 Absorber 6 Side sheet 7 Breakwater 8 Groove 10 Incontinence pad

Claims (8)

A front sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and a liquid-retaining absorbent core interposed between the two sheets, The absorbent article has a longitudinal direction extending from the side part to the back side part through the crotch part, and a lateral direction perpendicular to the longitudinal direction,
The absorbent core contains a hydrophilic fiber and a water-absorbing polymer, and is divided into a pair of left and right side absorbent parts and a central absorbent part sandwiched between the side absorbent parts in the lateral direction. The part absorption part is arranged in the vertical direction in plan view,
The basis weight of the water absorbent polymer of the central absorbent portion is larger than the weight of the water absorbent polymer of the side absorbent portion, and the basis weight of the water absorbent polymer of the side absorbent portion (q1). The ratio (q1 / q2) to (q2) is 2 or more and 5 or less,
In the absorbent core, an absorbent article in which a groove portion penetrating in the thickness direction is disposed in a vertical direction in the vicinity of a boundary between the side absorbent portion and the central absorbent portion.   The absorptive article according to claim 1 whose transverse groove width of said groove part is 2 mm or more and 7 mm or less.   On the skin contact surface side of the absorbent core, the side absorption part and the central absorption part are flush with each other, or the side absorption part is lower than the central absorption part, and at the initial stage of excretion The absorbent article according to claim 1 or 2, wherein the entire side absorbent portion is raised to become a leakage barrier and is higher than the central absorbent portion.   The groove portion is arranged so as to overlap with the boundary between the side absorption portion and the central absorption portion, or the distance between the boundary and the laterally outer end of the groove portion is set to 10 mm or less than the boundary. The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is arranged near the center of the direction.   The length in the longitudinal direction of the groove is equal to or more than three central sections when the longitudinal length of the absorbent core is divided into five equal parts, and is within 80% of the longitudinal length of the absorbent core. Item 5. The absorbent article according to any one of Items 1 to 4.   The absorptive article according to any one of claims 1 to 5, wherein the water-absorbing polymer contained in the side absorption part is arranged more on the non-skin contact surface side than on the skin contact surface side.   The hydrophilic core which covers the non-skin contact surface side of a groove part and a side part absorption part, and was further wound up to the side surface of the said side part absorption part is distribute | arranged to the said absorptive core. The absorbent article according to any one of the above.   The absorbent article according to any one of claims 1 to 7, wherein the absorbent article is an incontinence pad.

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