JP2018086148A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article in which bad odor derived from excrement is reduced.SOLUTION: An absorbent core 4 comprises a lamination structure of: a skin side layer 40 forming a skin facing surface and having a content of water absorptive fibers which is larger than that of a water absorptive polymer; and a non-skin side layer 41 forming a non-skin facing surface, and in which a ratio of a content of the water absorptive polymer to a content of the water absorptive fibers is larger than that of the skin side layer 40. An antibacterial agent is adhered to a surface of the water absorptive polymer. The absorbent article has a first sheet 5 contacting the skin facing surface of the skin side layer 40, and a second sheet 6 which is interposed between the skin side layer 40 and the non-skin side layer 41 and contacts both layers 40, 41. The second sheet 6 has a liquid diffusion property in a plane direction which is higher than that of the first sheet 5.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent article using an antibacterial water-absorbing polymer.

  Absorbent articles such as disposable diapers and absorbent pads are disposed between a liquid-permeable top sheet located on the wearer's skin side, a liquid-impermeable back sheet located on the clothing side, and both sheets. And an absorbent body mainly composed of water-absorbing materials such as pulp fibers and water-absorbing polymers. In the absorbent article having such a configuration, the absorber is an element that greatly affects various properties required for the absorbent article, such as the ability to absorb excrement such as urine and the fit to the wearer's body. Various improved techniques have been proposed in the past.

  In Patent Document 1, in an absorbent article having a general configuration, a liquid diffusion sheet made of a nonwoven fabric containing cellulose fibers, such as a wet spunlace nonwoven fabric, is interposed between an absorbent body having a single layer structure and a back sheet. When the absorber is divided into five equal parts in the thickness direction, the layer closest to the liquid diffusion sheet among the five layers may be the layer having the largest volume fraction of water-absorbing polymer. Have been described. According to the absorbent article described in Patent Document 1, the absorption capacity of the excrement is improved by effectively and efficiently utilizing the entire absorbent body while sufficiently ensuring the capability of repeatedly diffusing the excrement of the liquid diffusion sheet. It is said that it can be made.

  Patent Document 2 describes that an absorbent body constituting an absorbent article has a laminated structure of an upper layer and a lower layer, and an opening (slit) penetrating the layer in the thickness direction is formed in each of both layers. . It is said that the formation of such slits can be expected to improve liquid diffusibility and fit to the wearer's body. Patent Document 2 describes that a liquid diffusion sheet is disposed so as to be in contact with the skin facing surface of the upper layer, and another liquid diffusion sheet is disposed between the upper layer and the lower layer. According to the absorbent article described in Patent Document 2, it is said that the absorption capacity, liquid diffusibility, and collection capacity of each layer of the laminated structure of the absorber can be efficiently utilized.

  Further, the absorbent article has a problem of generation of malodor derived from excrement absorbed and held by the absorbent body. For example, conventionally, for the purpose of reducing the economical and labor burden associated with excrement disposal, an absorbent pad such as a urine collecting pad is used in an overlapping manner with an absorbent article such as a disposable diaper. However, if there is urination while wearing a combination of a urine absorbing pad and a disposable diaper, the excreted urine will rot and a bad odor will be generated in about several hours, and the bad odor will diffuse into the space around the wearer. .

  In order to solve the problem of such a foul odor derived from excrement, a technique for imparting an antibacterial agent to a water-absorbing polymer is known. For example, Patent Document 3 discloses an antibacterial property comprising a hydrogel-forming absorption polymer and an antibacterial agent as a water-absorbing polymer that can be used in an absorbent body of an absorbent article, and the hydrogel-forming absorption polymer is coated with the antibacterial agent. Hydrogel-forming absorbent polymers are described.

JP2015-66382A Japanese Patent Laid-Open No. 2006-129529 Special Table 2000-513408

  The malodor derived from the excrement does not stop when the absorbent article is worn, but also becomes a problem when the absorbent article is replaced, and the absorbent pad discarded as used also has a problem of bad odor. The absorbent articles described in Patent Documents 1 and 2 do not take into account the problem of malodor derived from excrement. In order to solve such a problem, as described in Patent Document 3, it is effective to add an antibacterial agent to the water-absorbing polymer, but simply using such an antibacterial water-absorbing polymer. It is not possible to effectively suppress the foul odor derived from excrement.

  In a typical absorbent body, the water-absorbing fibers and the water-absorbing polymer are uniformly mixed. When the urine is discharged from the excretory part of the wearer with respect to the absorbent body, the excretory part in the absorbent body. In the part located in the part (excretion part opposing part) oppositely arranged, first, urine concentrates on the non-skin facing side (relatively far from the wearer's skin) of the absorber, and then gradually The urine diffuses on the opposite side of the skin (the side closer to the wearer's skin), and finally the urine becomes saturated in the thickness direction of the absorber. Since the urine is saturated with bacteria on the skin-facing surface and in the vicinity thereof, the urine and bacteria that rot the urine are present. It will be a source of According to the knowledge of the present inventors, simply by replacing the water-absorbing polymer uniformly distributed in the absorber with an antibacterial one, generation of malodor in the vicinity of the skin facing surface of such an absorber Cannot be suppressed sufficiently. In general, an antibacterial agent having a high antibacterial effect is highly irritating to the skin, and therefore, during the wearing of an absorbent article including an absorbent body containing a water-absorbing polymer to which the antibacterial agent has been applied, When the urine is saturated, the antibacterial agent is dissolved in the urine, and the urine containing the antibacterial agent may come into contact with the skin and cause skin trouble.

  Therefore, the subject of this invention is related with providing the absorbent article with which the malodor derived from excrement was reduced.

  The present invention has a longitudinal direction extending from the wearer's ventral side to the back side through the crotch part and a lateral direction perpendicular thereto, and a top sheet and a position farther from the wearer's skin than the top sheet. An absorbent article comprising an arranged back sheet and an absorbent core interposed between both sheets, wherein the absorbent core forms a skin-facing surface of the absorbent core, and is a water-absorbing polymer. The skin-side layer having a higher water-absorbing fiber content and the non-skin-facing surface of the absorbent core are formed, and the ratio of the water-absorbing polymer content to the water-absorbing fiber content than the skin-side layer is A first sheet that has a laminated structure with a large non-skin side layer, the water-absorbing polymer has an antibacterial agent, and contacts the skin-facing surface of the skin side layer, and the skin side layer and the non-skin side A second sheet that is disposed between and in contact with both layers, the second sheet being compared to the first sheet. Liquid diffusibility in the planar direction Te is high absorbent article.

  Further, the present invention has a longitudinal direction extending from the wearer's stomach side to the back side through the crotch part and a lateral direction perpendicular thereto, and a surface sheet and a position farther from the wearer's skin than the surface sheet An absorbent article comprising a back sheet disposed on the sheet and an absorbent core interposed between the sheets, wherein the absorbent core forms a skin-facing surface of the absorbent core and absorbs water. The skin-side layer having a higher water-absorbing fiber content than the polymer and the non-skin-facing surface of the absorbent core are formed, and the ratio of the water-absorbing polymer content to the water-absorbing fiber content than the skin-side layer The non-skin side layer has a single layer structure in which the non-skin side layer is integrated, the water-absorbing polymer has an antibacterial agent, and the first sheet in contact with the skin side layer and the non-skin side layer A second sheet, and the second sheet has higher liquid diffusibility in the plane direction than the first sheet. Is a Osamusei goods.

  The present invention is also a method for producing the absorbent article of the present invention, wherein an antibacterial agent is dissolved in a low-volatile and hydrophilic organic solvent to obtain an antibacterial agent solution, and the antibacterial agent solution and the water-absorbing polymer are obtained. An antibacterial water-absorbing polymer in which an antibacterial agent is attached to the surface of the water-absorbing polymer, and forming the absorbent core using the antibacterial water-absorbing polymer. It is a manufacturing method of a property article.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article with which the malodor derived from excrement was reduced is provided.

FIG. 1 is a plan view schematically showing a skin facing surface, that is, a surface sheet side of an example of an absorbent pad which is an embodiment of the absorbent article of the present invention. The elastic member of each part is extended to be planar. It is a top view in the unfolded expansion state. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 3A is a plan view schematically showing a skin side layer (upper layer) of the absorbent body in the absorbent pad shown in FIG. 1, and FIG. 3B is a non-skin side layer (lower layer) of the absorbent body. It is a top view which shows typically. FIG. 4 is a cross-sectional view schematically showing how the absorbent pad shown in FIG. 1 is used, and is a view corresponding to FIG. 2 showing a state in which the absorbent pad is disposed on the skin facing surface side of the disposable diaper. Fig.5 (a)-FIG.5 (c) are sectional drawings along the thickness direction of this absorptive core which show typically the distribution state of excrement, such as urine, in an absorptive core, respectively. a) is a cross-sectional view of a conventional absorbent core that is out of the scope of the present invention, and FIGS. 5B and 5C are cross-sectional views of the absorbent core according to the present invention. FIG. 6 is a view corresponding to FIG. 2 of another embodiment of the absorbent core according to the present invention. FIG. 7 is a view corresponding to FIG. 2 of still another embodiment of the absorbent core according to the present invention. FIG. 8 is an explanatory diagram of a method for measuring the liquid permeation time.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the absorbent pad which is the one Embodiment. The absorbent pad 1 of the present embodiment has a vertical direction X extending from the wearer's abdomen to the back via the crotch and a lateral direction Y orthogonal thereto, and is disposed on the wearer's abdomen. It has a ventral side F, a back side R arranged on the back side, and a crotch M positioned between them. The crotch part M includes a non-illustrated excretory part facing part that is opposed to the excretion part of the wearer when worn. The excretory part opposing part is normally in a position biased slightly closer to the back side R than the central part in the longitudinal direction X of the absorbent pad 1. Specifically, the excretory part facing part is present in the longitudinal direction X of the absorbent pad 1 from the center in the longitudinal direction X of the absorbent pad 1 (absorbent article) to the front side (ventral side) in the longitudinal direction X. A region sandwiched between a position separated by a distance corresponding to 10% of the total length and a position separated by a distance corresponding to 15% of the total length from the center to the rear side (back side) of the longitudinal direction X, and the region Is the center in the horizontal direction Y.

  As shown in FIGS. 1 and 2, the absorbent pad 1 includes a liquid-permeable surface sheet 2 that can come into contact with the wearer's skin when worn, and a position farther from the wearer's skin than the surface sheet 2. And the absorbent core 4 interposed between the sheets 2 and 3. The absorbent core 4 is disposed at least in the crotch part M. In the absorbent pad 1, the absorbent core 4 extends in the longitudinal direction X from the abdominal side F through the crotch M to the back side R as shown in FIG. 1. The absorbent pad 1 (absorbent core 4) has a vertically long shape in the longitudinal direction X in a plan view as shown in FIG. 1, the longitudinal direction thereof coincides with the longitudinal direction X, and the width direction thereof in the lateral direction Y. Match.

  As shown in FIG. 4, the absorbent pad 1 of the present embodiment can be used by being disposed on the skin facing surface side of a disposable diaper 100 as a separate absorbent article. The disposable diaper 100 used in combination with the absorbent pad 1 includes a liquid permeable top sheet 101 that forms a skin facing surface, a liquid permeable back sheet 102 that forms a non-skin facing surface, and a space between both sheets 101 and 102. In the same manner as the absorbent pad 1, the absorbent body 103 is long in one direction. A pair of leak-proof cuffs 104 and 104 having elastic members are provided on both sides of the disposable diaper 100 on the skin facing surface side along the longitudinal direction X, and the lateral direction Y of the absorbent body 103 is outward. A pair of leg flap portions 105, 105 having elastic members are provided.

  In the present specification, the “skin-facing surface” is a surface of the absorbent article or a component thereof (for example, the absorbent core 4) that is directed toward the wearer's skin when the absorbent article is worn, that is, relatively. It is the side close to the skin of the wearer, and the “non-skin facing surface” is the surface of the absorbent article or its constituent members that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn, that is, relative It is the side far from the wearer's skin. In addition, "at the time of wearing" here means the state in which the normal proper wearing position is maintained, and does not include the case where the absorbent article is in a state of being deviated from the proper wearing position.

  Each of the top sheet 2 and the back sheet 3 has a size larger than that of the absorbent core 4, and extends outward from the periphery of the absorbent core 4. They are joined together by a known joining means such as a seal. Each of the top sheet 2 and the back sheet 3 forms the outer shape of the absorbent pad 1 in a developed and stretched state as shown in FIG. As shown in FIG. 2, the top sheet 2 covers the entire skin facing surface of the absorbent core 4, and the back sheet 3 covers the entire non-skin facing surface of the absorbent core 4. The core 4 extends outward in the lateral direction Y from both side edges along the longitudinal direction X. As the top sheet 2 and the back sheet 3, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet 2, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 3. The back sheet 3 includes, for example, a form in which a liquid-impermeable film sheet alone and a form in which nonwoven fabrics as exterior sheets are laminated and disposed on the non-skin facing surface side of the film sheet.

  A pair of leak-proof cuffs 14, 14 composed of a liquid-permeable and breathable leak-proof cuff forming sheet 13 are provided on the left and right sides along the longitudinal direction X on the skin facing surface of the absorbent pad 1. ing. In the vicinity of the free end of each leak-proof cuff 14, one or more elastic members 15 for forming a leak-proof cuff are arranged in an elongated state in the longitudinal direction X. As shown in FIG. 2, the leak-proof cuff forming sheet 13 is formed on the topsheet 2 by a known joining means such as an adhesive or fusion at a position overlapping both side edges along the longitudinal direction X of the absorbent core 4. When the absorbent pad 1 is worn, the leak-proof cuff 14 stands up toward the wearer's skin with the joint 16 as a starting point.

  As shown in FIGS. 1 to 3, the absorbent core 4 includes a skin-side layer (upper layer) 40 that forms a skin-facing surface of the absorbent core 4 (a surface closest to the wearer's skin in the absorbent core 4). The laminated structure (two-layer structure) with the non-skin side layer (lower layer) 41 which forms the non-skin opposing surface (surface farthest from the wearer's skin in the absorbent core 4) of the absorbent core 4. As shown in FIG. 3 (a), the skin side layer 40 is a constricted portion in which the length in the lateral direction Y, that is, the width of the skin side layer 40 is shorter than the peripheral portion from the abdominal side F to the crotch M. 3B, the non-skin side layer 41 has a rectangular shape in plan view and does not have a constricted portion as shown in FIG. Both side edges along the direction X are parallel to the longitudinal direction X over the entire length.

  In the absorbent pad 1, as shown in FIGS. 1 and 3, the non-skin side layer (lower layer) 41 is smaller in size in plan view than the skin side layer (upper layer) 40, and more specifically. The non-skin side layer 41 is made shorter than the skin side layer 40 at least in the lengthwise direction X. The non-skin side layer 41 is disposed at least in the excretory part facing part where the excrement such as urine is excreted intensively and its peripheral part, and in the absorbent pad 1, as shown in FIG. It is arranged over the entire length in the vertical direction X, and further extends from the crotch part M to the front part F and the rear part R, respectively. That is, the absorbent core 4 is not entirely laminated, and the front and rear ends in the longitudinal direction X where the non-skin side layer 41 is not disposed have a single layer structure consisting only of the skin side layer 40. ing.

  As shown in FIG. 2, the first sheet 5 is disposed on the skin facing surface of the skin side layer 40, and the second sheet 6 is interposed between the skin side layer 40 and the non-skin side layer 41. . The 1st sheet | seat 5 is in contact with the skin opposing surface of the skin side layer 40, and has coat | covered the whole region of this skin opposing surface. The second sheet 6 is in contact with both the non-skin facing surface of the skin-side layer 40 and the skin-facing surface of the non-skin-side layer 41, and covers the entire areas of both. The first sheet 5 and the skin side layer 40 and the second sheet 6 and the skin side layer 40 and the non-skin side layer 41 are joined by an adhesive, respectively.

  In the absorbent pad 1, as shown in FIG. 2, in addition to the first sheet 5 and the second sheet 6, a third sheet 9 in contact with the non-skin facing surface of the non-skin side layer 41 is arranged. The third sheet 9 covers the entire area of the non-skin facing surface of the non-skin side layer 41. These sheets 5, 6 and 9 are all liquid-permeable sheets, and paper, nonwoven fabrics produced by various manufacturing methods, etc. can be used for each.

  In the absorbent pad 1, as shown in FIGS. 1 to 3, the excretory part-facing part on the skin-facing face of the absorbent core 4, that is, the skin-facing face of the skin-side layer 40, has a lower basis weight than the peripheral part. An amount of grooves 7 are formed. Further, in the absorbent pad 1, a groove 8 having a lower basis weight than the peripheral portion is also formed in the excretory part facing part of the non-skin facing surface of the absorbent core 4, that is, the non-skin facing surface of the non-skin side layer 41. Is formed. In the absorbent pad 1, the groove 7 is an opening that penetrates the skin side layer 40 in the thickness direction, as shown in FIG. 2, and no material for forming the skin side layer 40 exists in the groove 7. Similarly, the groove 8 is an opening that penetrates the non-skin side layer 41 in the thickness direction, and no material for forming the non-skin side layer 41 exists in the groove 8.

  The grooves 7 and 8 are formed in a pair of symmetry with respect to an imaginary center line CL (see FIG. 3) extending in the vertical direction X by dividing the absorbent core 4 into two in the horizontal direction Y. Each of the grooves 7 and 8 has a linear shape (strip shape) extending in the longitudinal direction X in a plan view as shown in FIG. 3 and extends from the crotch portion M including the excretory portion facing portion to the ventral side portion F. . Each of the grooves 7 and 8 is located in the crotch M and extends in the vertical direction X, and is located in the ventral side F, from the end in the vertical direction X near the ventral side F of the linear part. A bent portion extending forward in the vertical direction X and outward in the horizontal direction Y, and the linear portion and the bent portion are connected to each other. As shown in FIG. 3 (a), the groove 7 is not open to the peripheral edge of the skin side layer 40, but has a closed end at each of the front and rear ends in the length direction. As shown in FIG. 3 (b), the non-skin side layer 41 is not opened at the peripheral edge portion, but has a closed end portion at each of the longitudinal front and rear ends thereof.

  As shown in FIGS. 1 and 2, the groove 7 of the skin side layer 40 and the groove 8 of the non-skin side layer 41 overlap each other. More specifically, the groove 7 and the groove 8 have a similar shape in plan view, and the groove 8 has a larger length and width than the groove 7, so that as shown in FIG. The planar view shape of the overlapping part of the grooves 7 and 8 in the plan view on the skin facing surface side (surface sheet 2 side) of the absorbent pad 1 is the same as that of the groove 7 having a relatively small length and width. . Thus, when the groove 7 of the skin side layer 40 and the groove 8 of the non-skin side layer 41 are similar to each other, the absorbent pad 1 is bent at both grooves 7 and 8 and deformed three-dimensionally. In addition, a relatively wide portion is formed between a low-rigidity portion formed by overlapping the groove 7 and the groove 8 and a high-rigidity portion having a relatively high basic weight without a groove (low basis weight portion). Middle rigid portion in which there is a portion extending outward in the lateral direction Y from a relatively narrow groove (groove 7 in the absorbent pad 1) in a plan view in the groove (groove 8 in the absorbent pad 1) Since the middle rigid portion functions as a buffer portion, when the absorbent pad 1 is deformed, the curvature of the bent portion formed by the grooves 7 and 8 being crushed or overlapping becomes smooth, The absorbent pad 1 becomes easier to follow the wearer's body, and the uncomfortable feeling at the time of wearing is further reduced.

  One of the main features of the absorbent pad 1 of the present embodiment is that the second sheet 6 has higher liquid diffusibility in the planar direction than the first sheet 5. The “liquid diffusivity in the planar direction” referred to here can be determined by using the Krem water absorption height and the liquid permeation time measured by the following method as indices. It can be evaluated that the larger the values of both the Klem water absorption height and the liquid permeation time, the better the sheet is in the liquid diffusibility in the plane direction, that is, the liquid is more likely to diffuse in the plane direction perpendicular to the thickness direction of the sheet. . The liquid permeation time is an index of the liquid permeation rate, and the longer the liquid permeation time, the lower the liquid permeation rate. The liquid permeation time is highly evaluated as being excellent in liquid diffusibility (inferior in liquid permeability).

<Measurement method of Klem water absorption height>
The measurement method conforms to JIS P8141. A sheet to be measured is cut into a rectangular shape in plan view of 200 mm in length and 20 mm in width to obtain a measurement sample. The longitudinal direction of the measurement sample is made to coincide with the vertical direction, and a portion extending 15 mm upward from the lower end of the measurement sample is placed in a container. Soak in deionized water. The rising height of the deionized water in the measurement sample after 10 minutes from the immersion in the deionized water is measured, and the measured value is taken as the Klem water absorption height. From the viewpoint of facilitating measurement of the rising height of deionized water in the measurement sample, the deionized water in which the measurement sample is immersed may be colored with a dye such as Blue No. 1 or methylene blue. The measurement is performed three times, and the average value is taken as the Klem water absorption height of the sheet. The measurement environment is a room temperature of 22 ± 2 ° C. and a humidity of 65 ± 2% RH. The longitudinal direction of the sheet to be measured refers to the same direction as the longitudinal direction of the absorbent article.
If the sheet to be measured is a small size less than the dimensions of the measurement sample, the small size sheet is used as a measurement sample in the measurement method, and the deionization in the measurement sample is performed. The measurement of the rising height of the water is defined as the time when 2 minutes have passed since the immersion in deionized water.

<Measurement method of liquid permeation time>
As shown in FIG. 8, two cylinders 91 and 92 having an inner diameter of 35 mm with upper and lower ends opened are arranged up and down with the axes of both cylinders 91 and 92 aligned, and an 8 cm square measurement sample S is placed up and down. Between the cylinders 91 and 92. At this time, it is preferable that the upper and lower cylinders 91 and 92 are connected by fitting the clip 93 to an annular flange portion provided at the lower end of the upper cylinder 91 and the upper end of the lower cylinder 92. Reference numeral 94 denotes a rubber packing having a through hole having the same diameter and the same shape as the inner diameters of the cylinders 91 and 92. Thus, in the state where the measurement sample S is sandwiched and fixed between the upper and lower cylinders 91 and 92, a physiological saline (an aqueous solution having a sodium chloride concentration of 0.9 mass%) indicated by the symbol W in FIG. 40 g ± 1 g is supplied. The supplied physiological saline passes through the measurement sample S or is absorbed by the measurement sample S and disappears from the upper cylinder 91. The time from when the physiological saline starts to be supplied until the physiological water surface reaches the same position as the surface of the measurement sample S (the surface on the upper cylinder 91 side) is taken as the liquid permeation time.
A method of taking out the target sheets (first sheet and second sheet) to be the measurement sample S from the absorbent article is as follows. Cold spray (made by Nichiban Co., Ltd., trade name) is sprayed from the surface sheet side of the absorbent article. Thereafter, the constituent members of the absorbent article other than the measurement target (for example, the target sheet) are carefully peeled off from the absorbent article.

  The absorbent body of the absorbent article typically includes an absorbent core 4Z, a skin-side core wrap sheet 5Z that covers the skin-facing surface of the absorbent core 4Z, and an absorbent core as shown in FIG. When the urination is performed from the excretion part of the wearer during wearing of the absorbent article, the excrement is the excretion of the non-skin-side core wrap sheet 6Z that covers the non-skin facing surface of 4Z. Urine normally passes through the skin-side core wrap sheet 5Z and is absorbed and passed around the excretory part-facing part of the absorbent core 4Z, and gradually, in the planar direction, that is, by the capillary force of the constituent fibers of the absorbent core 4Z. While diffusing in both the vertical direction X and the horizontal direction Y, the film moves to the non-skin facing surface side, that is, the non-skin side core wrap sheet 6Z side in the thickness direction and concentrates there. The arrows in FIG. 5 indicate the movement direction or the diffusion direction of the excrement U. Here, when the liquid diffusibility in the planar direction of the absorbent core 4Z is low, that is, the liquid is difficult to diffuse in the vertical direction X or the horizontal direction Y, as shown in FIG. 5A, the absorbent core 4Z. The excrement U is saturated at the portion located in the excretory part facing part and the vicinity thereof (in the crotch M), and the surface layer part (skin side core wrap sheet 5Z side) including the skin facing surface of the absorbent core 4Z Therefore, the excrement U and the bacteria that rot the excrement U are present for a long time, and as a result, the skin facing surface side of the absorbent core 4Z can be a source of unpleasant urine odor.

  Then, in the absorbent pad 1 which is one embodiment of the present invention, as described above, in order to solve the problem of malodor derived from such excrement, the absorbent core 4 having a laminated structure is relatively worn by the wearer. Paying attention to the skin side layer 40 disposed near the skin, the first sheet 5 that touches and covers the skin facing surface of the skin side layer 40 and the non-skin facing surface of the skin side layer 40 touch this. And the second sheet 6 has high liquid diffusibility in the planar direction in comparison with the first sheet 5 (both values of both the Krem water absorption height and the liquid permeation time are large). ) The seat was adopted. With such a configuration, as shown in FIG. 5 (b), the excrement U that has passed through the first sheet 5 acts on the skin side layer 40 with the second sheet 6 having relatively high liquid diffusibility in the planar direction. Therefore, the excrement U is unevenly distributed on the second sheet 6 side, i.e., the non-skin facing surface side, and on the first sheet 5 side, i.e., the skin facing surface side. The amount of the excrement U existing is reduced as compared with the amount of the excrement U existing on the skin facing surface side of the conventional absorbent core 4Z shown in FIG. Therefore, according to the absorbent pad 1, generation | occurrence | production of the unpleasant odor (bad odor) in the position comparatively close to the wearer's skin in the absorbent core 4 is suppressed effectively. In addition, since the excrement U hardly remains on the skin facing surface side of the skin side layer 40, the skin side layer 40 not only becomes a source of bad odor itself, but also the non-skin facing surface of the skin side layer 40 on which the excrement U concentrates. Even if a bad odor is generated from the side, the bad odor is released from the skin facing surface of the absorbent core 4 in order to function as a “lid” that prevents the bad odor from being transmitted to the skin side of the wearer. Is effectively suppressed. In addition, illustration of the groove | channel 7 (refer FIG. 2) of the skin side layer 40 is abbreviate | omitted in FIG.5 (b).

From the viewpoint of ensuring the above-described effects, the ratio of the water absorption height of the second sheet 6 and the water absorption height of the first sheet 5 is preferably 1.1 or more as the former / the latter, More preferably, it is 1.2 or more. The higher the Klem water absorption height of the second sheet 6 is, the more preferable, and the upper limit value of the ratio is not particularly limited.
From the same viewpoint, the liquid permeation time of the second sheet 6 is preferably 8 seconds or longer, more preferably 10 seconds or longer, on the assumption that the liquid permeation time of the first sheet 5 is longer. On the assumption that the liquid permeation time of the first sheet 5 is shorter than the liquid permeation time of the second sheet 6, it is preferably 7 seconds or less, more preferably 6 seconds or less.

  Adjustment of the water absorption time and liquid permeation time (liquid permeation rate) of the sheets 5 and 6, that is, adjustment of liquid diffusibility in the plane direction is adjusted by selection of constituent fibers, crepe rate, beating degree, added chemicals, and the like. be able to. The following forms A and B can be exemplified as the form in which the magnitude relationship of “first sheet 5 <second sheet 6” can be established with respect to the liquid diffusibility in the planar direction (Klem water absorption height and liquid permeation time). In the following forms A and B, as the sheets 5 and 6, paper produced by wet papermaking is preferably used. The following forms A and B can be used in appropriate combinations.

Form A: The second sheet 6 contains more hardwood bleached kraft pulp (LBKP) than the first sheet 5.
Form B: The second sheet 6 has a higher crepe rate than the first sheet 5.

With respect to Form A, LBKP has a smaller fiber diameter and shorter fiber length than softwood bleached kraft pulp (NBKP), which is widely used in the same manner as LBKP, as a material for forming this type of sheet. Capillary force and capillary force between fibers increase. Further, since the distance between the fibers is reduced, the liquid has a longer residence time on the sheet, which contributes to the improvement of the liquid diffusibility in the planar direction of the sheet.
The ratio between the content of LBKP in the second sheet 6 and the content of LBKP in the first sheet 5 is preferably 4 or more, more preferably 10 or more as the former / the latter. The greater the content of LBKP in the second sheet 6, the better. There is no particular limitation on the upper limit of such ratio.
The content of LBKP in the second sheet 6 is preferably 10% by mass or more, more preferably 30% by mass or more, and preferably 60% by mass or less, more preferably 50% with respect to the total mass of the second sheet 6. It is below mass%.
The content of LBKP in the first sheet 5 is preferably 5% by mass or less with respect to the total mass of the first sheet 5 and may not contain zero, that is, LBKP.

  Regarding the form B, the crepe is a sheet crease, and the higher the crepe rate, the more creases are formed on the surface of the sheet. A paper having a crepe has a higher liquid diffusibility in the plane direction than a paper not having a crepe, and the liquid diffusibility tends to increase as the crepe rate increases. As the crepe, for example, when the sheets 5 and 6 are paper formed by wet papermaking, it occurs when the dry fiber web is peeled off from the Yankee dryer or the like in the dryer part of the wet papermaking by a doctor knife or the like. Dry crepes can be employed. The crepe rate is measured by the following method.

<Measurement method of crepe rate>
Measured by the underwater elongation method. The measurement target sheet is cut into 100 mm × 100 mm to prepare a measurement sample, the measurement sample is immersed in water and then pulled up, and the crepe rate is calculated from the amount of dimensional change according to the following equation. The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining three points is taken as the measured value. Crepe rate (%) = {(dimension after being immersed in water) / (dimension before being immersed in water) -1} × 100

The ratio between the crepe rate of the second sheet 6 and the crepe rate of the first sheet 5 is preferably at least 1.2 or more as the former / the latter, and is preferably as large as possible.
The crepe rate of the second sheet 6 is preferably 16% or more, more preferably 20% or more. The larger the crepe rate of the second sheet 6 is, the more preferable, and there is no particular limitation on the upper limit value of such ratio.
The crepe rate of the first sheet 5 is preferably 15% or less, and zero, that is, the crepe may not be formed.

  In the absorbent pad 1, as described above, the liquid in the planar direction is used for the sheets 5 and 6 covering the skin facing surface and the non-skin facing surface of the skin side layer 40 constituting the skin facing surface side of the absorbent core 4. With regard to diffusivity (Klem water absorption height and liquid permeation time), the excretion such as urine absorbed in the skin side layer 40 is established as shown in FIG. As shown in b), the non-skin facing surface side, that is, the second sheet 6 side is unevenly distributed so that there is almost no excrement on the skin facing surface side, that is, the first sheet 5 side. In order to achieve the effect more reliably, another configuration is adopted. That is, in the absorbent pad 1, the above-described uneven distribution of excrement in the thickness direction of the skin side layer 40 is extended to the entire absorbent core 4, and specifically, the skin side layer 40 and the non-skin In the absorbent core 4 having a laminated structure with the side layer 41, the absorbed excrement is concentrated on the non-skin side layer 41 so that the excrement is not present in the skin side layer 40 as much as possible.

  That is, in the absorbent pad 1, the skin-side layer 40 that forms the skin-facing surface of the absorbent core 4 is a high fiber content layer having a higher water-absorbing fiber content than the water-absorbing polymer. The non-skin-side layer 41 forming the non-skin facing surface is a high water-absorbing polymer content layer having a larger ratio of the water-absorbing polymer content to the water-absorbing fiber content than the skin-side layer 40. In the absorbent pad 1, as will be described later, an antibacterial water absorption having an antibacterial agent as a part or all of the water absorbent polymer contained in the absorbent core 4 (skin side layer 40, non-skin side layer 41). When using an adhesive polymer, the “content of water-absorbing polymer” in the skin-side layer 40 and the non-skin-side layer 41 is the content of all the water-absorbing polymers in the layers 40 and 41 regardless of the presence or absence of an antibacterial agent. Amount.

  As described above, the skin side layer 40 is a fiber high content layer and the non-skin side layer 41 is a water absorbent polymer high content layer, thereby excrement such as urine as shown in FIG. U concentrates on the non-skin side layer 41 containing a large amount of the water-absorbing polymer having the ability to absorb and hold this, and the effect of the uneven distribution of the water-absorbing polymer and the second sheet 6 to the first sheet 5. Compared with the effect due to the high liquid diffusibility in the planar direction, the excrement U can be hardly present in the skin side layer 40. Further, since the skin side layer 40 is a high fiber content layer, the skin side layer 40 can function as a “lid” that effectively seals malodor that may be generated from the non-skin side layer 41. From the above, malodor derived from excrement is effectively reduced, and the chance that excrement comes into contact with the skin of the wearer is reduced, and skin troubles caused by wearing of absorbent pad 1 are effectively prevented. Is possible. In addition, in FIG.5 (c), illustration of the groove | channel 7 of the skin side layer 40 and the groove | channel 8 (refer FIG. 2) of the non-skin side layer 41 is abbreviate | omitted.

The ratio of the content of the water absorbent fiber to the content of the water absorbent polymer in the skin side layer 40 (the content of the water absorbent fiber / the content of the water absorbent polymer) is preferably 1.5 or more, more preferably 2 or more. And preferably 10 or less, more preferably 5 or less.
In the non-skin side layer 41, the ratio of the water absorbent fiber content to the water absorbent polymer content (water absorbent fiber content / water absorbent polymer content) is preferably 0.5 or more, more preferably 0. .8 or more, and preferably 1.4 or less, more preferably 1.0 or less.
Regarding such a content ratio (content of water-absorbing fiber / content of water-absorbing polymer), the skin side layer 40 which is a high fiber content layer is a non-skin side layer 41 which is a high water content polymer layer. Bigger than.

The ratio of the water-absorbing polymer content to the water-absorbing fiber content in the skin side layer 40 (water-absorbing polymer content / water-absorbing fiber content) is preferably 0.1 or more, more preferably 0. .2 or more, and preferably 0.6 or less, more preferably 0.5 or less.
In the non-skin side layer 41, the ratio of the water-absorbing polymer content to the water-absorbing fiber content (water-absorbing polymer content / water-absorbing fiber content) is preferably 0.7 or more, more preferably 1.0 or more, preferably 2.0 or less, more preferably 1.2 or less.
About such a content mass ratio (content of water-absorbing polymer / content of water-absorbing fiber), as described above, the non-skin side layer 41 which is a high water-absorbing polymer content layer is a fiber high content layer. It is larger than the skin side layer 40.

The content of the water-absorbing fiber in the skin side layer 40 is preferably 60% by mass or more, more preferably 67% by mass or more, and preferably 91% by mass or less, more preferably with respect to the total mass of the skin side layer 40. Is 83 mass% or less.
The content of the water-absorbing polymer in the skin side layer 40 is preferably 9% by mass or more, more preferably 17% by mass or more, and preferably 40% by mass or less, more preferably with respect to the total mass of the skin side layer 40. Is 33% by mass or less.

The content of the water absorbent fibers in the non-skin side layer 41 is preferably 33% by mass or more, more preferably 44% by mass or more, and preferably 60% by mass or less, with respect to the total mass of the non-skin side layer 41. More preferably, it is 50 mass% or less.
The content of the water-absorbing polymer in the non-skin side layer 41 is preferably 40% by mass or more, more preferably 50% by mass or more, and preferably 66% by mass or less, with respect to the total mass of the non-skin side layer 41. More preferably, it is 55 mass% or less.

Moreover, the skin side layer 40 is the non-skin side layer 41 from a viewpoint of making the bad smell sealing effect by the function as a "lid" of the skin side layer 40 which is a fiber high content rate layer mentioned above more reliably. It is preferable that the basis weight of the water-absorbent fiber is larger than that.
The ratio of the basis weight of the water absorbent fibers in the skin side layer 40 to the basis weight of the water absorbent fibers in the non-skin side layer 41 is preferably 0.7 or more, more preferably 1.1 or more, as the former / the latter. , Preferably 1.8 or less, more preferably 1.5 or less.
The basis weight of the water absorbent fiber in the skin side layer 40 is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and preferably 500 g / m ² or less, more preferably 400 g / m ² or less. .
The basis weight of the water absorbent fibers in the non-skin side layer 41 is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and preferably 450 g / m ² or less, more preferably 400 g / m ² or less. is there.

The basis weight of the water-absorbing polymer in the skin side layer 40 is preferably 30 g / m ² or more, more preferably 50 g / m ² or more, and preferably 150 g / m ² or less, more preferably 120 g / m ² or less. .
The basis weight of the water-absorbing polymer in the non-skin side layer 41 is preferably 100 g / m ² or more, more preferably 150 g / m ² or more, and preferably 500 g / m ² or less, more preferably 450 g / m ² or less. is there.

In addition, the basic weight of fibers, such as a water absorbing fiber, and a water absorbing polymer in the absorptive core (skin side layer, non-skin side layer) of an absorbent article can be measured by the following method.
As with other measurements, a cold spray (trade name, manufactured by Nichiban Co., Ltd.) is sprayed on the absorbent article, and the constituent members of the absorbent article other than the measurement target are carefully peeled to take out the absorbent core. When an absorptive core is a multilayer structure, it isolate | separates for every layer and measures each layer. In the case where the absorbent core has a single-layer structure, the thickest portion of the single-layer absorbent core is divided into two in the thickness direction, and measured by separating the skin-side layer and the non-skin-side layer. A predetermined area is cut out from each layer of the removed absorbent core to obtain a measurement sample, the weight of the measurement sample is measured, and the weight is divided by the area to calculate the basis weight of the absorbent core. In addition, the weight of the absorbent core in the measurement sample (absorbent core) (all the water-absorbent polymers contained in the measurement sample including the antibacterial water-absorbent polymer) is quantified, and the basis weight of the absorbent core that has already been calculated. From this, the basis weight of the water-absorbing polymer is subtracted, and the basis weight of the fiber in the measurement sample is calculated. The “weight of the water-absorbing polymer in the measurement sample (absorbent core)” is the measurement sample obtained by measuring the weight and area of the measurement sample and then immersing the measurement sample in an ascorbic acid solution and exposing it to sunlight. It can be calculated by dissolving the water-absorbing polymer therein, washing the solution with water and determining the residual fiber weight, and subtracting the residual fiber weight from the weight of the measurement sample.

  As the water-absorbing fiber used for the absorbent core 4, hydrophilic fibers conventionally used as a material for forming an absorbent body of this type of absorbent article can be used. For example, wood pulp such as softwood pulp and hardwood pulp can be used. Natural fibers such as non-wood pulp; modified pulp such as cationized pulp and mercerized pulp; regenerated fiber such as cupra and rayon; semi-synthetic fiber such as acetate; hydrophilic synthetic fiber such as polyvinyl alcohol fiber and polyacrylonitrile fiber; Examples thereof include fibers obtained by subjecting hydrophobic synthetic fibers such as polyethylene terephthalate fibers, polyethylene fibers, polypropylene fibers, and polyester fibers to a hydrophilic treatment, and these can be used alone or in combination of two or more. .

  The water-absorbing polymer used for the absorbent core 4 is generally a particulate polymer, but may be a fibrous polymer. When the particulate superabsorbent polymer is used, the shape thereof may be any of a spherical shape, a block shape, a bowl shape, and an amorphous shape. The average particle size of the water-absorbing polymer is preferably 10 μm or more, more preferably 100 μm or more, and preferably 1000 μm or less, more preferably 800 μm or less. As the water-absorbing polymer, generally, a polymer or copolymer of acrylic acid or an alkali metal acrylate can be used. Examples thereof include polyacrylic acid and salts thereof and polymethacrylic acid and salts thereof. As the polyacrylate and polymethacrylate, sodium salts can be preferably used. In addition, acrylic acid or methacrylic acid, maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate, styrenesulfonic acid, etc. It is also possible to use a copolymer obtained by copolymerizing these comonomers within a range that does not deteriorate the performance of the water-absorbing polymer.

  The absorptive core 4 can be manufactured according to a conventional method using a water absorbing fiber and a water absorbing polymer (antibacterial water absorbing polymer). Specifically, for example, raw materials such as a water-absorbing fiber and a water-absorbing polymer are stacked in a recess for accumulation having a shape corresponding to the outer shape of the absorbent core 4 (skin side layer 40, non-skin side layer 41). It can be manufactured by a method. As a manufacturing apparatus suitable for manufacturing an absorbent core by stacking such raw materials, for example, a rotating drum having a concave portion for accumulation on the outer peripheral surface, and a duct having a supply passage for supplying raw materials to the outer peripheral surface inside. The raw material is supplied in a scattered state to the outer peripheral surface while rotating the rotating drum around the rotation axis, and is sucked from the bottom of the concave portion for accumulation composed of a porous member in which a plurality of suction holes are formed. A fiber stacking apparatus that stacks raw materials into the accumulation recesses can be used.

  Further, in the absorbent pad 1, as described above, a groove having a lower basis weight than the peripheral portion is formed on the skin facing surface of the absorbent core 4, that is, on the skin facing surface of the skin side layer 40, compared to the peripheral portion. Since the liquid diffusibility in the plane direction in the skin side layer 40 is more effectively suppressed by the presence of the groove 7, the plane direction in the sheets 5 and 6 described above is formed. The skin side layer 40 to the non-skin side layer are combined with the effect of the liquid diffusibility (Klem water absorption height and liquid permeation time) in magnitude and the effect of uneven distribution of the water absorbent polymer in the thickness direction of the absorbent core 4. The movement of excrement to 41 is further promoted, and the excrement hardly exists in the skin side layer 40.

From the standpoint of ensuring the above-described effects, the dimensions and the like of each part of the absorbent core 4 are preferably set as follows.
The basis weight of the skin side layer 40 is preferably 180 g / m ² or more, more preferably 230 g / m ² or more, and preferably 550 g / m ² or less, more preferably 450 g / m ² or less.
The basis weight of the non-skin side layer 41 is preferably 150 g / m ² or more, more preferably 300 g / m ² or more, and preferably 800 g / m ² or less, more preferably 700 g / m ² or less.
The thickness of the skin side layer 40 under no load is preferably 2.5 mm or more, more preferably 4 mm or more, and preferably 12.5 mm or less, more preferably 10 mm or less.
The thickness of the non-skin side layer 41 under no load is preferably 2.5 mm or more, more preferably 4 mm or more, and preferably 11.3 mm or less, more preferably 10 mm or less.

The width 7W (see FIG. 3) of each of the pair of grooves 7 of the skin side layer 40 is preferably 10 mm or more, more preferably 12 mm or more, and preferably 40 mm or less, more preferably 30 mm or less.
The distance 7P (see FIG. 3, the narrowest distance) between the pair of grooves 7 and 7 is preferably 15 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, more preferably 55 mm or less.
The width 8W (see FIG. 3) of each of the pair of grooves 8 and 8 of the non-skin side layer 41 is preferably 12 mm or more, more preferably 25 mm or more, and preferably 40 mm or less, more preferably 30 mm or less.
The interval 8P (see FIG. 3, the narrowest interval) between the pair of grooves 8, 8 is preferably 12 mm or more, more preferably 15 mm or more, and preferably 50 mm or less, more preferably 40 mm or less.

The basis weight of the first sheet 5 is preferably 10 g / m ² or more, more preferably 11 g / m ² or more, and preferably 25 g / m ² or less, more preferably 20 g / m ² or less.
The basis weight of the second sheet 6 is preferably 10 g / m ² or more, more preferably 11 g / m ² or more, and preferably 25 g / m ² or less, more preferably 20 g / m ² or less.
The thickness of the first sheet 5 under no load is preferably 0.8 mm or more, more preferably 1 mm or more, and preferably 2 mm or less, more preferably 1.8 mm or less.
The thickness of the second sheet 6 under no load is preferably 0.8 mm or more, more preferably 1 mm or more, and preferably 2.5 mm or less, more preferably 2 mm or less.

In the present specification, the “thickness under no pressure” means “thickness under a pressure of 0.05 kPa” measured by the following method.
Cold spray (made by Nichiban Co., Ltd., trade name) is sprayed from the surface sheet side of the absorbent article. Thereafter, the constituent members of the absorbent article other than the measurement target (for example, the absorbent core) are carefully peeled off from the absorbent article. A circular plate having a weight of 2.5 g and a radius of 12.5 mm is placed on the measurement table, and the position of the upper surface of the circular plate in this state is set as a reference point A for measurement. Next, the circular plate is removed, the object to be measured is placed on the measurement table, the circular plate is placed again thereon, and the position of the upper surface of the circular plate in that state is set as position B. A laser displacement meter (manufactured by Keyence Corporation, CCD laser displacement sensor LK-080) is used as a measuring instrument. The difference between the reference point A and the position B is defined as the thickness of the measurement object under no pressure, that is, the thickness of the absorber under a pressure of 0.05 kPa.

  Moreover, when the 1st sheet | seat 5 or the skin side layer 40 contains "the deodorizing agent which exhibits a deodorizing function by physical adsorption", the further reduction of a bad odor can be anticipated. That is, in the absorbent pad 1, since the excrement concentrates on the non-skin side layer 41 as described above, the bad odor originating from the non-skin side layer 41 is directed toward the wearer's skin. Where the first sheet 5 can pass sequentially, the first sheet 5 and the skin-side layer 40 contain the deodorant, so that it is possible to capture malodorous components that are passing through the first sheet 5, thereby Further reduction can be expected. As the deodorant, a porous material can be used. Specific examples include activated carbon, silver or metal-supported zeolite such as zinc or copper, and silver-supported divinylbenzene / 2-vinylpyridine copolymer. These 1 type can be used individually or in combination of 2 or more types. Among these, a metal-supported zeolite such as silver or zinc or copper is particularly preferable.

The content of the deodorant in the skin side layer 40 is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and preferably 5% by mass with respect to the total mass of the skin side layer 40. % Or less, more preferably 3% by mass or less.
The content of the deodorant in the first sheet 5 is preferably 1% by mass or more, more preferably 3% by mass or more, and preferably 12% by mass or less, based on the total mass of the first sheet 5. Preferably it is 10 mass% or less.

  In the absorbent pad 1, as described above, as shown in FIG. 5C, most of the excrement U existing in the absorbent pad 1 is concentrated on the non-skin side layer 41 in which the water-absorbing polymer is unevenly distributed. However, an antibacterial water-absorbing polymer having an antibacterial agent (hereinafter referred to as “antibacterial property”) is used as the water-absorbing polymer in order to suppress the growth of bacteria that cause malodor in the non-skin side layer 41 where the excrement is concentrated. SAP "). As a preferable example of the antibacterial SAP, one having a form in which an antibacterial agent is attached to the surface of the water-absorbing polymer can be mentioned.

  In the absorbent article of the present invention, the entire water-absorbing polymer contained in the absorbent core (skin-side layer, non-skin-side layer) may be an antibacterial SAP, or the water-absorbing polymer. Only some of them may be antibacterial SAPs, and others may be water-absorbing polymers that do not have antibacterial properties.

  In an absorbent article containing a normal water-absorbing polymer, most of the excrement such as urine is absorbed by the water-absorbing polymer. Since the antibacterial agent can be present in the state of adhering to the surface of the water-absorbing polymer, the bacterial growth can be effectively suppressed. In addition, as described above, there is a concern that antibacterial agent dissolves in urine due to the use of antibacterial SAP, and urine containing the antibacterial agent comes into contact with the skin and causes skin troubles. Since there is almost no excrement such as urine in the skin side layer 40 disposed in a relatively close position, such concerns are eliminated, and skin troubles caused by the use of antibacterial SAP are unlikely to occur. . Details of the antibacterial SAP will be described later.

  6 and 7 show another embodiment of the absorbent core according to the present invention. In other embodiments to be described later, constituent parts different from those of the above-described embodiment will be mainly described, and the same constituent parts are denoted by the same reference numerals and description thereof will be omitted. The description of the above embodiment is applied as appropriate to components that are not particularly described.

  In the absorbent core 4A shown in FIG. 6, at least in the crotch part M where the excretory part-facing part exists, the skin side layer 40 is laterally extended from both side edges 41S and 41S along the longitudinal direction X of the non-skin side layer 41. Y extends outside. That is, at least in the crotch part M, the skin side layer 40 is relatively long in the lateral direction Y and wide, and the non-skin side layer 41 is relatively short in the lateral direction Y and narrow. The non-skin side layer 41 overlaps the central portion in the lateral direction Y of the wide skin side layer 40. The first sheet 5 in contact with the skin facing surface of the wide skin side layer 40 covers the entire area of the skin facing surface, and in the lateral direction Y from each of the side edges 40S and 40S along the longitudinal direction X of the skin side layer 40. It extends outward and the extension part hangs down to the non-skin side layer 41 side. The second sheet 6 covers the entire skin facing surface of the narrow non-skin side layer 41, but the non-skin facing surface of the wide skin side layer 40 is in the lateral direction Y overlapping the non-skin side layer 41. Only the center part is covered, and both side parts in the lateral direction Y of the non-skin facing surface of the skin side layer 40 are exposed.

  According to the absorbent core 4A, the skin-side layer 40, which is a high fiber content layer that can function as a “lid” that seals malodor, is more concentrated than the non-skin-side layer 41 where excrement concentrates and tends to be a source of malodor. Since it is comprised widely, the sealing effect of the malodor by the skin side layer 40 comes to be show | played more reliably, and malodor can be reduced further. From the viewpoint of more surely exhibiting such effects, the length 40EL (see FIG. 6) extending from the side edge 41S of the non-skin side layer 41 in the skin side layer 40 is preferably 3 mm or more, and further It is preferably 5 mm or more, and preferably 30 mm or less, and more preferably 20 mm or less.

  The absorbent core 4B shown in FIG. 7 has a single layer structure in which the skin side layer 40 and the non-skin side layer 41 are integrated. That is, when the thickest part (arrangement part of the non-skin side layer 41) in the absorbent core 4B having a single layer structure is bisected in the thickness direction, the skin facing surface side, that is, the first sheet 5 side is the skin side layer 40, The non-skin facing surface side, that is, the second sheet 6 side is the non-skin side layer 41. When the absorbent core 4B having the single layer structure absorbs excrement such as urine, the distribution state of the excrement is in the skin side layer 40 constituting the absorbent core 4 having the laminated structure shown in FIG. It is substantially the same.

The basis weight of the entire absorbent core 4B is preferably 300 g / m ² or more, more preferably 400 g / m ² or more, and preferably 1200 g / m ² or less, more preferably 1000 g / m ² or less. The thickness of the entire absorbent core 4B under no load is preferably 3 mm or more, more preferably 4 mm or more, and preferably 20 mm or less, more preferably 15 mm or less. The same effects as the absorbent core 4 are basically obtained by the absorbent core 4B.

Hereinafter, the antibacterial SAP used in the present invention will be described.
The antibacterial SAP includes at least a water-absorbing polymer and an antibacterial agent as essential components. Depending on the production conditions, in addition to the water-absorbing polymer and the antibacterial agent, an organic solvent may be a constituent of the antibacterial SAP. In addition, inorganic fine particles may be a constituent of antibacterial SAP. As the water-absorbing polymer constituting the antibacterial SAP, a polymer material that can absorb water and swell and retain water can be used, and such a polymer material is known in the art. Specifically, the water-absorbing polymer can be exemplified.

  In the antibacterial SAP, the antibacterial agent can be present attached to the surface of the water-absorbing polymer. Moreover, when an organic solvent and an inorganic fine particle are contained in the structural component of antibacterial SAP, these can also exist in the state adhering to the surface of a water absorbing polymer.

  An organic compound is preferably used as the antibacterial agent. This is because organic antibacterial agents have a higher antibacterial effect than inorganic antibacterial agents such as zinc oxide and silver-containing antibacterial agents.

  The antibacterial agent is preferably hydrophobic. The hydrophobicity mentioned here is not strong hydrophobicity that completely separates from water when mixed with water, but is preferably hydrophobic so that it is partially soluble in water but mostly insoluble in water. Specifically, a hydrophobic antibacterial agent having a solubility in water at 25 ° C. of 0.1% by mass or less, particularly 0.05% by mass or less is preferable. Such a hydrophobic antibacterial agent is preferably used for the absorbent article of the present invention because it has lower skin irritation than the hydrophilic antibacterial agent. Hydrophilic antibacterial agents are hydrophilic and thus easily penetrate into the skin, which is likely to irritate the skin. In contrast, hydrophobic antibacterial agents are hydrophobic and therefore difficult to penetrate the skin and tend to stay on the surface of the skin, making it difficult to irritate the skin.

  The solubility of the antibacterial agent can be measured by the following method. 100 g of deionized water just before it can not be dissolved even after stirring for 1 hour, after adding sufficiently dried antibacterial agent to 100 g of deionized water at 25 ° C., stirring and dissolving with a stirrer or shaker Is the solubility (mass%) of the antibacterial agent in 25 ° C. water.

Whether or not the water-absorbing polymer in the absorbent core of the absorbent article has an antibacterial agent (antibacterial SAP) can be confirmed by the following method.
The adhesive which joins the structural members of the absorbent article is peeled off by the aforementioned cold spray, and the absorbent core is taken out. The removed absorbent core is passed through a coarse sieve (aperture 850 μm), and a fraction containing a water-absorbing polymer is collected. When the collected fraction is placed in a glass cylinder such as a screw tube and rotated, the fiber material is sorted into the upper layer and the water absorbent polymer is sorted into the lower layer due to the difference in specific gravity between the fiber material such as pulp and the water absorbent polymer. The The thus selected water-absorbing polymer is subjected to antibacterial agent extraction treatment. That is, a water-absorbing polymer is added using methanol as a solvent, and the solvent is subjected to ultrasonic vibration and stirring, and then the solvent supernatant is removed from a solvent-based filter (manufactured by Kanto Chemical Co., Ltd., PTFE resin, pore size). 0.45 μm, 25 mmφ), and the solvent in the filtrate is volatilized to obtain a solid content. This solid content is separated so as to obtain a single compound by using a known analytical means such as liquid chromatography. The chemical structure of the obtained compound is specified using a well-known analysis means such as infrared absorption spectroscopy or nuclear magnetic resonance spectroscopy. In addition, 0.1% by weight of each of the obtained compounds was contained in the absorbent paper, and JIS L 1902 “Antimicrobial test method and antibacterial effect of textile products” was performed. As a result, the antibacterial activity value of E. coli was 2.0. If it is above, it turns out that this compound is an antibacterial agent. Further, whether or not the antibacterial agent is a hydrophobic antibacterial agent can be confirmed by the aforementioned solubility. In addition, if there are contaminants such as solvents and inorganic substances from the spectrum obtained by infrared absorption spectroscopy and nuclear magnetic resonance spectroscopy measurements of the extracted solid, the same compound as the identified compound Commercial products may be purchased and used for solubility and other measurements.

  As described above, an organic hydrophobic antibacterial agent is preferably used as the antibacterial agent which is a constituent component of the antibacterial SAP. As the organic hydrophobic antibacterial agent, for example, an organic compound represented by the following formula (1) or (2) is preferably used. This is because these organic compounds have high antibacterial effects and low skin irritation. These organic compounds can be used individually by 1 type or in combination of 2 or more types.

In the organic hydrophobic antibacterial agent represented by the formula (1), the number of carbon atoms in R ¹ and R ² is preferably independently 6 or more, and preferably 8 or more, except for a methyl group and an ethyl group. Is more preferably 10 or more, more preferably 24 or less, still more preferably 22 or less, and still more preferably 20 or less.

In the organic hydrophobic antibacterial agent represented by the formula (1), the number of carbon atoms in R ³ and R ⁴ is preferably independently 6 or more, except for a methyl group or an ethyl group, and preferably 8 or more. Is more preferably 10 or more, more preferably 30 or less, still more preferably 24 or less, and still more preferably 22 or less.

In the organic hydrophobic antibacterial agent represented by the formula (1), when R ³ and / or R ⁴ is an alkyl alkylene oxide group, the number of carbon atoms of the alkyl group in the group is preferably 6 or more, 8 or more is more preferable, 24 or less is preferable, and 22 or less is more preferable. The number of carbon atoms of the alkylene group in the alkylalkylene oxide group is more preferably 2 or more, preferably 6 or less, and more preferably 4 or less.

In the organic hydrophobic antibacterial agent represented by the formula (2), the number of carbon atoms in R ⁵ is preferably 1 or more, more preferably 3 or more, still more preferably 6 or more, Further, it is preferably 30 or less, more preferably 24 or less, and still more preferably 22 or less.

In the organic hydrophobic antibacterial agent represented by the formula (2), when R ⁵ is a cycloalkyl group, the number of carbon atoms in the group is preferably 6 or more, more preferably 7 or more, Further, it is preferably 30 or less, and more preferably 24 or less.

In the organic hydrophobic antibacterial agent represented by the formula (2), when R ⁵ is an aryl group, the group is a phenyl group, a phenyl group substituted with an alkyl group having 1 to 18 carbon atoms, a benzyl group, A benzyl group substituted with an alkyl group having 1 to 18 carbon atoms and a phenoxyalkyl group having 7 to 24 carbon atoms are preferable.

In the organic hydrophobic antibacterial agent represented by the formula (2), when R ⁵ is an alkyl alkylene oxide group, the number of carbon atoms of the alkyl group in the group is more preferably 6 or more, and is 24 or less. It is preferable that it is 22 or less. The number of carbon atoms of the alkylene group in the alkylalkylene oxide group is more preferably 2 or more, preferably 6 or less, and more preferably 4 or less.

In the organic hydrophobic antibacterial agent represented by the formula (2), the carbon number in R ⁶ is preferably 1 or more, preferably 6 or less, and more preferably 4 or less.

In the organic hydrophobic antibacterial agent represented by the formula (2), when R ⁶ is a cycloalkyl group, the group is more preferably a cyclopentyl group or a cyclohexyl group.

In the organic hydrophobic antibacterial agent represented by the formula (2), when X ⁺ is an alkali metal ion, examples thereof include lithium ion, sodium ion and potassium ion. When X ⁺ is an alkaline earth metal ion, examples thereof include magnesium ion, calcium ion, and strontium ion. When X ⁺ is a divalent to tetravalent cation, examples thereof include ethanolamine, diethanolamine, triethanolamine, N-substituted ethanolamine, N-substituted diethanolamine, trishydroxyaminomethane, guanidine, ethylenediamine, hexamethylenediamine. And a proton salt of an amine such as hexamethylenetetramine (a compound obtained by adding H ⁺ to an amine).

  Specific examples of the organic hydrophobic antibacterial agent represented by the formula (1) include benzalkonium cetyl phosphate. As the benzalkonium cetyl phosphate, an antibacterial agent sold as trade name Sanizole P by Kao Corporation can be used. On the other hand, specific examples of the organic hydrophobic antibacterial agent represented by the formula (2) include 1-hydroxy-4-methyl-6- (2,4,4-trimethylpentyl) -2 (1H) -pyridone monoethanol. Amine salt [1-Hydroxy-4-methyl-6- (2,4,4-trimethyl-pentyl) -2 (1H) -pyridone; combination with 2-aminoethanol (1: 1)] (CAS registration number 68890-66 -4, also known as piroctone olamine). This antibacterial agent is represented by the formula (2A) and is sold by Clariant as the trade name Octopirox.

  Examples of organic hydrophobic antibacterial agents other than the above include 5-chloro-2- [2,4-dichlorophenoxy] phenol. This compound is also called triclosan.

  The antibacterial SAP can be produced through a step of dissolving an antibacterial agent (preferably an organic hydrophobic antibacterial agent) in an organic solvent to form an antibacterial agent solution, and mixing the antibacterial agent solution and the water-absorbing polymer. By mixing the antibacterial agent solution and the water absorbent polymer, the organic hydrophobic antibacterial agent can be uniformly attached to the water absorbent polymer. The antibacterial agent solution is preferably a solution in which the antibacterial agent is completely dissolved. When an undissolved antibacterial agent is present in the antibacterial agent solution, mixing the antibacterial agent solution and the water-absorbing polymer may cause the antibacterial agent to adhere unevenly. In addition, you may perform the surface crosslinking process which bridge | crosslinks the surface of a water absorbing polymer prior to performing the process of mixing an antibacterial agent solution and a water absorbing polymer.

  The organic solvent is preferably a liquid at 25 ° C. As the organic solvent, those capable of dissolving an antibacterial agent (preferably an organic hydrophobic antibacterial agent) are used. In particular, it is advantageous to use an organic solvent in which the solubility of the antibacterial agent is preferably 5% by mass or more, more preferably 10% by mass or more, and even more preferably 15% by mass or more. Here, a solubility of X mass% means that an antibacterial agent of X g or more dissolves in 100 g of an organic solvent. When the solubility of the antibacterial agent changes depending on the temperature, the solubility at the temperature when the antibacterial agent solution is mixed with the water-absorbing polymer is preferably as described above.

  The organic solvent is preferably low-volatile or non-volatile. Specifically, a low-volatile organic solvent having a vapor pressure at 25 ° C. of preferably 30 Pa or less, more preferably 20 Pa or less, particularly preferably 15 Pa or less, and even more preferably 10 Pa or less is preferable. When a highly volatile organic solvent is used, the organic solvent may volatilize during the production process of the antibacterial SAP, and thus an exhaust device needs to be attached to the production facility. On the other hand, if a low-volatile organic solvent is used, such a device is unnecessary. In addition, since highly volatile organic solvents may ignite or explode, it is necessary to attach an explosion-proof device to the manufacturing apparatus. However, if a low-volatile organic solvent is used, it is not necessary to install such a device. . Thus, by using a low-volatile organic solvent, after mixing the antibacterial agent solution and the water-absorbing polymer in the production process of the antibacterial SAP, the organic solvent should remain in the antibacterial SAP. Can do.

  Preferable compounds used as the organic solvent include water-soluble organic solvents such as polyhydric alcohols such as dihydric alcohol (diol), trihydric alcohol (triol), and tetrahydric or higher alcohol. The number of carbon atoms of the alkyl group in these polyhydric alcohols is preferably 2 or more. The carbon number of the alkyl group is preferably 18 or less, more preferably 10 or less, and even more preferably 4 or less.

  In particular, among the polyhydric alcohols, it is preferable to use a lower dihydric alcohol having 2 to 4 carbon atoms. Specifically, it is preferable to use at least one hydrophilic organic solvent selected from the group consisting of ethylene glycol, propylene glycol, and butylene glycol. This is because these hydrophilic organic solvents are highly safe for the human body, do not cause malodor, do not require a removal step, and have a low risk of ignition or explosion. As propylene glycol, 1,2-propylene glycol and 1,3-propylene glycol can be used. As butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol and 2,3-butylene glycol can be used.

  As described above, as an organic solvent that can be used as a solvent for an antibacterial agent solution in the production of an antibacterial SAP and can be a constituent component of the antibacterial agent SAP, the solubility of the antibacterial agent (preferably an organic hydrophobic antibacterial agent) is within the above range. It is preferable to use a low-volatility (including non-volatile) and hydrophilic material.

  The concentration of the antibacterial agent (preferably organic hydrophobic antibacterial agent) in the antibacterial agent solution is preferably 0.5% by mass or more, more preferably 1% by mass or more, and more preferably 3% by mass or more. More preferably, it is more preferably 5% by mass or more. The concentration of the antibacterial agent in the antibacterial agent solution is preferably 50% by mass or less, more preferably 35% by mass or less, still more preferably 25% by mass or less, and 20% by mass or less. It is even more preferable. By using the antibacterial agent solution in this concentration range, the antibacterial agent can be uniformly attached to the water-absorbing polymer.

  In mixing the antibacterial agent solution and the water-absorbing polymer, the antibacterial agent solution may be added to the water-absorbing polymer, and conversely, the water-absorbing polymer may be added to the antibacterial agent solution. Alternatively, the antibacterial agent solution and the water-absorbing polymer may be added simultaneously.

  When the antibacterial agent solution and the water-absorbing polymer are mixed, the ratio of the antibacterial agent solution (preferably organic hydrophobic antibacterial agent) in the antibacterial agent solution is 0.001 mass based on the mass of the water-absorbing polymer. %, Preferably a ratio of 0.005% by mass or more, more preferably a ratio of 0.01% by mass or more, and 0.05% by mass or more. It is even more preferable that the ratio is Further, based on the mass of the water-absorbing polymer, the ratio of the antibacterial agent in the antibacterial agent solution is preferably 1% by mass or less, more preferably 0.7% by mass or less, The ratio is more preferably 0.5% by mass or less. By mixing the antibacterial agent solution and the water-absorbing polymer at a ratio in this range, the antibacterial agent can be uniformly attached to the water-absorbing polymer. Moreover, even if it leaves both organic solvents after mixing both, the handleability of antibacterial SAP, especially fluidity | liquidity can be made favorable.

  After mixing the antibacterial agent solution and the water-absorbing polymer, the organic solvent may be removed by means such as heating or decompression as necessary. Of course, the organic solvent may be left without being removed. In any case, a step of mixing the mixed water-absorbing polymer and the inorganic fine particles may be further performed as a post-process. By performing this step, inorganic fine particles can be imparted to the water-absorbing polymer. The application of the inorganic fine particles is advantageous from the viewpoint of improving the powder characteristics of the target antibacterial SAP, particularly the fluidity. Examples of the inorganic fine particles include silica fine particles, zirconia oxide, aluminum oxide, iron oxide, zinc oxide, gold, and the like. One of these can be used alone or two or more can be used in combination. Among these inorganic fine particles, it is particularly preferable to use silica fine particles.

  In the antibacterial SAP obtained by the above method, that is, the antibacterial agent solution is dissolved in a low-volatile and hydrophilic organic solvent to obtain an antibacterial agent solution, and the antibacterial agent solution and the water-absorbing polymer are mixed. Has an antibacterial agent attached to the surface of the water-absorbing polymer, and in some cases, an antibacterial agent and an organic solvent are attached. In particular, in an antibacterial SAP in which the antibacterial agent is an organic hydrophobic antibacterial agent, due to the hydrophobicity of the antibacterial agent, at least the antibacterial agent adheres discontinuously to the surface of the water-absorbing polymer. The antibacterial agent and the organic solvent are discontinuously attached to the surface of the water-absorbing polymer. In other words, in the antibacterial SAP preferably used in the present invention, when the surface of the water-absorbing polymer is the sea, at least the antibacterial agent is present in a state of being scattered in islands in the sea. In some cases, antibacterial agents and organic solvents are scattered in islands in the sea. In this state, at least the antibacterial agent coats the surface of the water-absorbing polymer, so that the antibacterial SAP further improves its fluidity. From the viewpoint of making the fluidity improving effect more remarkable, the coverage of the antibacterial agent covering the surface of the water-absorbing polymer is preferably 5% or more, more preferably 7% or more, More preferably, it is 15% or more. The coverage of the antibacterial agent is preferably 40% or less, more preferably 30% or less, and further preferably 25% or less.

The coverage of the antibacterial agent covering the surface of the water-absorbing polymer can be measured by X-ray electron spectroscopy (ESCA). The specific measurement method is as follows. The absorbent core is taken out by weakening the adhesive force of the adhesive that joins the constituent members of the absorbent article with a cold spray and carefully peeling it off. Using a sieve having an opening of 1 mm to 5 mm, the water-absorbing polymer is roughly removed from the absorbent core. Further, the water absorbent fiber and the water absorbent polymer are separated by vibration, and only the water absorbent polymer is taken out. Fix the water-absorbing polymer uniformly on the sample table with double-sided adhesive carbon tape. At this time, the surface of the water-absorbing polymer is made flat. The measurement apparatus uses PHI Quantera SXM (ULVAC-PHI Inc.). Measurement conditions are as follows: X-ray source is monochromatic AlKα ray 1486.6 eV, 25 W, 15 kV, beam system is 500 μm × 500 μm, Pass energy is 280.OeV (survey) 112.OeV (narrow), Step is 1.00 eV ( survey) 0.20 eV (narrow), charging correction is Newizerizer and Ar ⁺ irradiation, photoelectron extraction angle is 45 degrees, detection elements are C1s (15), N1s (50), 01s (10), Na1s (15), Si2p (20) ), Correction of the binding energy position is performed with C1s284.8 cV derived from carbon CH. The coverage is calculated by the following formula.
Coverage of antibacterial agent = decrease amount of surface element concentration of “Na” after antibacterial agent treatment / surface element concentration of “Na” of untreated (maternal absorbent resin)

  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, in the above-described embodiment, the groove 7 of the skin side layer 40 and the groove 8 of the non-skin side layer 41 are both openings that penetrate the layer in the thickness direction. It may be a low basis weight, and the skin facing surface and / or the non-skin facing surface of the skin-side layer 40 or the non-skin-side layer 41 may be a recessed portion that is recessed in a concave shape. Further, one of the grooves 7 and 8 may be the opening, and the other may be the depression. In the above embodiment, the groove 7 is relatively narrow and the groove 8 is relatively wide. However, the horizontal length Y of the grooves 7 and 8, that is, the width relationship is limited to this. Instead, they may be reversed or the same. Moreover, the groove | channel 7 is formed only in the skin side layer 40, and the groove | channel (low basic weight part) does not need to be formed in the non-skin side layer 41. FIG. All the parts of only the one embodiment described above can be used together as appropriate.

  Absorbent articles of the present invention include absorbent pads (urine collecting pads), as well as disposable diapers, sanitary napkins, panty liners (orimono sheets), etc. for the absorption of excrement such as urine, feces, menstrual blood, etc. Can be used.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Examples 1 to 5 and Comparative Example 1]
A urine absorption pad having the same basic configuration as the absorbent pad 1 shown in FIGS. 1 to 3, that is, a urine absorption pad having a two-layer structure in which the absorbent core is composed of a skin side layer and a non-skin side layer is carried out. Samples of Examples 2 to 5 were used. A sample of Example 1 and Comparative Example 1 was prepared by preparing a urine absorption pad having the same basic structure as the absorbent pad 1 except that a single-layered absorbent core was used instead of the two-layered absorbent core. It was.
As the surface sheet, an air-through nonwoven fabric made of hydrophilic-treated fibers having a basis weight of 20 g / m ² was used. As the back sheet, a polyethylene film sheet having a basis weight of 20 g / m ² was used. As the leak-proof cuff forming sheet, an SMS nonwoven fabric having a basis weight of 15 g / m ² was used. As an antibacterial SAP, the octopirox (pyrocton olamine) was prepared by making a 10% by weight solution of an ethanol solvent, and 1% by weight of the solution was dropped onto the water-absorbing polymer, and the ethanol was added by an evaporator. Evaporated material, that is, 0.1% adhered to the water-absorbing polymer was used. Moreover, the solubility of Octopirox was 0.05 mass% or less. Details of the following sheets A to C used as the first sheet and the second sheet used in each example and comparative example are as follows.

Sheet A: Fiber material (NBKP 100% by mass) with a beating machine, beating degree 500ml, paper strength enhancer WS-4024 made by Starlight PMC Co., Ltd. 0.7% by mass, carboxymethyl cellulose 0.3% by mass A slurry was prepared, and wet papermaking was performed with a paper machine according to a conventional method to prepare a sheet having a crepe rate of 10% and a basis weight of 16 g / m ² .
Sheet B: Fiber material (NBKP 100% by mass) with a beating machine, beating degree 500ml, paper strength enhancer WS-4024 made by Seiko PMC Co., Ltd. 0.5% by mass, Mizusawa Chemical Co., Ltd. A slurry was prepared by adding 5.0% by mass, and 0.05% by mass of the fixing agent MT Aquapolymer Co., Ltd., Acoflock A95 was added just before papermaking in a paper machine, and wet papermaking was performed according to a conventional method. %, A sheet having a basis weight of 16 g / m ² was produced.
Sheet C: Fiber material (NBKP 60 mass%, LBKP 40 mass%) was beaten with a beating machine to a degree of beating of 500 ml, paper strength enhancer WS-4024 made by Seiko PMC Co., Ltd. was 0.7 mass%, and carboxymethyl cellulose was 0.3 mass % Was added to prepare a slurry, and wet papermaking was performed according to a conventional method to prepare a sheet having a crepe rate of 10% and a basis weight of 16 g / m ² .

〔Evaluation test〕
After each urine collection pad of each Example and Comparative Example was treated by the following method so that it smells similar to a used urine collection pad, and the treated urine collection pad was stored for a predetermined time The odor of was evaluated. The results are shown in Table 1 below.

<Odor evaluation method>
(Procedure 1) Prepare the same surface sheet used for the urine absorption pad to be evaluated, wet the surface sheet with water, and then squeeze it hard to make it a wet state. The area around the anus of one male was wiped off and intestinal bacteria were adhered to the top sheet. Such an operation was performed for two or more adult males, and two or more types of intestinal bacteria-attached surface sheets having different wiping targets were produced. The intestinal bacteria-attached surface sheet was placed in a waterproof bag together with several ml of human urine and allowed to stand for 12 hours at a room temperature of 36 ° C. to promote the growth of intestinal bacteria.
(Procedure 2) The contents of the bag of Procedure 1 and human urine 500 m were put into a beaker and mixed.
(Procedure 3) After injecting 30 ml of human urine in the beaker of Procedure 2 into the outermost surface (the skin facing surface of the surface sheet) of the urine collection pad to be evaluated, put the urine collection pad in a sealed container It was stored for 6 hours in a 36 ° C. environment.
(Procedure 4) From the urine collecting pad after storage, the absorbent body (the component member disposed between the top sheet and the back sheet) is divided into three parts in the longitudinal direction (longitudinal direction), and at the center and in the lateral direction Cut out half of the length to make a measurement sample.
(Procedure 5) About the measurement sample, according to the following 6-step evaluation according to the 6-step odor intensity display method defined by the Ministry of the Environment, the odor was evaluated by five monitors with adjusted odor sensory levels. In the following evaluation criteria, if the evaluation score exceeds 3, the sulfur odor is mixed and the odor makes it feel rotten. It is judged that the bad odor is reduced as the evaluation score is lower, and the evaluation is higher.
Evaluation criteria 0: No odor.
1: There is a smell.
2: The urine peculiar smell is understood.
3: The urine peculiar smell can be easily understood.
4: The urine-specific odor is strongly understood.
5: The odor peculiar to urine is violently understood.

1 Absorbent pad (absorbent article)
2 Top sheet 3 Back sheet 4, 4A, 4B, 4Z Absorbent core 40 Skin side layer (upper layer)
41 Non-skin side layer (lower layer)
5 1st sheet 6 2nd sheet 7, 8 Groove 9 3rd sheet F Abdominal side part M Crotch part R Back side part X Longitudinal direction Y Lateral direction

Claims (8)

It has a longitudinal direction extending from the wearer's ventral side to the back side through the crotch part and a lateral direction perpendicular thereto, and a top sheet and a back surface disposed at a position farther from the wearer's skin than the top sheet An absorbent article comprising a sheet and an absorbent core disposed between both sheets,
The absorbent core forms a skin-facing surface of the absorbent core, forms a skin-side layer having a higher water-absorbing fiber content than the water-absorbing polymer, and forms a non-skin-facing surface of the absorbent core, It has a laminated structure with a non-skin side layer in which the ratio of the water absorbent polymer content to the water absorbent fiber content is larger than the skin side layer,
The water-absorbing polymer has an antibacterial agent;
A first sheet that is in contact with the skin-facing surface of the skin-side layer; and a second sheet that is disposed between and in contact with the skin-side layer and the non-skin-side layer; An absorbent article having a higher liquid diffusibility in the planar direction than the first sheet.   The absorbent article according to claim 1, wherein the skin side layer extends laterally outward from both side edges along the longitudinal direction of the non-skin side layer. It has a longitudinal direction extending from the wearer's ventral side to the back side through the crotch part and a lateral direction perpendicular thereto, and a top sheet and a back surface disposed at a position farther from the wearer's skin than the top sheet An absorbent article comprising a sheet and an absorbent core disposed between both sheets,
The absorbent core forms a skin-facing surface of the absorbent core, forms a skin-side layer having a higher water-absorbing fiber content than the water-absorbing polymer, and forms a non-skin-facing surface of the absorbent core, It has a single-layer structure in which the non-skin side layer has a larger ratio of the water absorbent polymer content to the water absorbent fiber content than the skin side layer,
The water-absorbing polymer has an antibacterial agent;
A first sheet in contact with the skin side layer; and a second sheet in contact with the non-skin side layer; the second sheet has high liquid diffusibility in a planar direction as compared with the first sheet. Goods.   The absorbent article according to any one of claims 1 to 3, wherein the antibacterial agent has a solubility in deionized water at 25 ° C of 0.1% by mass or less.   The groove | channel of the low basic weight is formed in the site | part arrange | positioned facing the excretion part of a wearer in the skin opposing surface of the said absorptive core compared with a peripheral part. Absorbent articles.   The absorbent article according to any one of claims 1 to 5, wherein the skin-side layer has a greater basis weight of water-absorbing fibers than the non-skin-side layer.   The absorptive article given in any 1 paragraph of Claims 1-6 in which said 1st sheet or said skin side layer contains a deodorant which exhibits a deodorizing function by physical adsorption. It is a manufacturing method of an absorptive article given in any 1 paragraph of Claims 1-7,
An antibacterial agent is obtained by dissolving an antibacterial agent in a low-volatile and hydrophilic organic solvent to obtain an antibacterial agent solution, mixing the antibacterial agent solution and the water-absorbing polymer, and then attaching the antibacterial agent to the surface of the water-absorbing polymer. Obtaining a water-absorbing polymer;
Forming the absorbent core using the antibacterial water-absorbing polymer.

Images