CN113164302B - Absorbent article - Google Patents
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- CN113164302B CN113164302B CN201980079674.6A CN201980079674A CN113164302B CN 113164302 B CN113164302 B CN 113164302B CN 201980079674 A CN201980079674 A CN 201980079674A CN 113164302 B CN113164302 B CN 113164302B
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Abstract
The purpose of the present invention is to provide an absorbent article capable of improving the absorbency of watery feces. The present invention is an absorbent article to be worn in the crotch of a wearer, comprising an absorbent body (6C) and liquid-permeable sheets (6W, 7) covering the wearer-side surface of the absorbent body, wherein the absorbent body (6C) has pulp having a pulp amount of 60g/m2 or more, 500mm or more in the longitudinal direction and 100mm or more in the width direction, the static friction coefficient of the surfaces of the liquid-permeable sheets (6W, 7) that are in contact with the wearer is 0.59 or more, the liquid-permeable sheets (6W, 7) have a laminated portion obtained by overlapping a part of a core wrap sheet (6W) that wraps the absorbent body (6C) with a top sheet (7) that covers the absorbent body wrapped by the core wrap sheet, and the air resistance of each member in the laminated portion is smaller than 0.0962kPa · sec/m.
Description
Technical Field
The present invention relates to absorbent articles such as diapers, pads, sanitary napkins and the like.
Background
Conventionally, an absorbent article is provided with an absorber extending in a longitudinal direction connecting an abdominal side and a back side of a wearer, as disclosed in patent document 1, for example. The absorbent body absorbs liquid such as excreted urine and menstrual blood. In an absorbent article, the absorbent body is disposed between a liquid-permeable top sheet (top sheet) and a liquid-impermeable back sheet (back sheet), so that urine excreted into the top sheet is absorbed by the absorbent body, and leakage of urine absorbed by the absorbent body is prevented by the back sheet.
Documents of the prior art
Patent document
Patent document 1: international publication No. 2016/114209
Disclosure of Invention
Problems to be solved by the invention
As the liquid-permeable material constituting the top sheet, for example, nonwoven fabric is used. Since a nonwoven fabric can achieve a soft skin touch, it is suitable as a material for the top sheet that comes into contact with the skin of the wearer. However, as an object excreted from the wearer, there are stool and watery stool in addition to urine and menstrual blood. The excrement is mostly solid, and the water sample is a mixture of solid and liquid. Further, the absorbent body of the absorbent article cannot absorb solid matter. Thus, the absorbent article is replaced when the wearer of the absorbent article excretes feces or watery feces.
When an absorbent article is replaced, it is necessary to perform a replacement operation so that excrement remaining on the top sheet does not fall off the absorbent article. However, in the case of watery feces, since liquid and solid matter are present in a mixture, it takes time for the liquid to permeate through the top sheet when compared with urine. Therefore, when the watery feces are compared with urine and feces, the absorbent article is likely to leak when it is removed from the wearer. Further, if water sample leaks, solid matter that is not absorbed by the absorber may leak out together.
Accordingly, an object of the present invention is to provide an absorbent article capable of improving the absorbency of watery feces. The present invention also aims to provide an absorbent article that can improve the absorption of watery feces and suppress the leakage of solid matter.
Means for solving the problems
In order to solve the above problems, in the present invention, the absorbent body is made to have a pulp (pulp) amount of 60g/m2The pulp having a size of 500mm or more in the longitudinal direction and 100mm or more in the width direction is used in a liquid-permeable sheet covering the wearer-side surface of an absorbent body, wherein the static friction coefficient of the surface that contacts the wearer is 0.59 or more, and the air flow resistance of each member in a laminated portion in which a part of a core wrap sheet (japanese: コアラップシート) that wraps the absorbent body is overlapped with a top sheet that covers the absorbent body wrapped by the core wrap sheet is made smaller than 0.0962kPa sec/m.
More specifically, the present invention is an absorbent article to be worn in the crotch of a wearer, comprising an absorbent body and a liquid-permeable sheet covering the wearer-side surface of the absorbent body, the absorbent body having a pulp amount of 60g/m2The liquid permeable sheet has a static friction coefficient of 0.59 or more on a surface contacting a wearer, and the liquid permeable sheet has a laminated portion in which a part of a core wrap sheet covering the absorbent body and a top sheet covering the absorbent body covered with the core wrap sheet are overlapped, and the air flow resistance of each member in the laminated portion is smaller than 0.0962kPa sec/m.
In order to solve the above problem, the present invention provides an absorbent body having a pulp amount of 60g/m2The above pulp having a size of 500mm or more in the longitudinal direction and 100mm or more in the width direction, the liquid-permeable sheet covering the wearer-side surface of the absorbent body, a part of the core wrap sheet covering the absorbent body, and the absorbent sheet covered with the core wrap sheetThe air flow resistance of each member in the laminated portion obtained by laminating the top sheets of the body is smaller than 0.0962kPa · sec/m, and the openings forming the concave portions in the liquid-permeable sheet are provided in the absorbent body.
More specifically, the present invention is an absorbent article to be worn in the crotch of a wearer, comprising an absorbent body and a liquid-permeable sheet covering the wearer-side surface of the absorbent body, the absorbent body having a pulp amount of 60g/m2The liquid-permeable sheet has a laminated portion in which a part of a core wrap sheet covering the absorbent body is overlapped with a top sheet covering the absorbent body covered with the core wrap sheet, and the liquid-permeable sheet has a ventilation resistance of each member in the laminated portion of less than 0.0962kPa sec/m, and the absorbent body has an opening portion in which a concave portion is formed in the liquid-permeable sheet by opening toward the liquid-permeable sheet.
The absorbent body may have a length extending from a front torso region located on the abdomen side of the wearer to a rear torso region located on the back side via a crotch region located in the crotch in a state where the absorbent article is worn on the wearer, and the opening may extend in the longitudinal direction of the absorbent body.
The absorbent body may have a lower absorbent body and an upper absorbent body disposed on the topsheet side of the lower absorbent body, and the openings may be opening portions of holes that penetrate the upper absorbent body in the thickness direction.
The opening may be an opening portion of a hole penetrating the absorbent body in the thickness direction.
The liquid-permeable sheet may have a static friction coefficient of 0.59 or more on the surface thereof that contacts the wearer.
Further, the liquid-permeable sheet may have 1 or more predetermined members between the core wrap sheet and the top sheet, and the ventilation resistance of the laminated portion of the predetermined members may be smaller than 0.0962kPa sec/m, respectively.
The absorbent body may have at least 2 or more layers, and the layer on the wearer side may contain a larger amount of SAP particles as superabsorbent polymers than the other layers.
Further, the absorbent body may have 2 or more layers, at least any one of which is a layer of SAP particles.
ADVANTAGEOUS EFFECTS OF INVENTION
In the absorbent article, the absorption of watery feces can be improved. In addition, the absorbent article described above can improve the absorption of watery feces and can suppress the leakage of solid matter.
Drawings
Fig. 1 is a perspective view of the diaper of embodiment 1.
Fig. 2 is an exploded perspective view of the diaper.
Fig. 3 is a cross-sectional view of the diaper in a non-worn state, the center in the longitudinal direction being cut along the width direction.
Fig. 4 is a diagram illustrating a method of an experiment for verifying the absorbency of watery feces.
Fig. 5 is a diagram showing the kind of core wrap sheet of the test sample prepared in the present verification.
Fig. 6 is a graph 1 showing the test results.
Fig. 7 is a graph 1 showing the measurement results of the ventilation resistance.
Fig. 8 is a graph 2 showing the measurement results of the ventilation resistance.
Fig. 9 is a 2 nd graph showing the test results.
Fig. 10 is a table showing the measurement results of the wearing sensation.
Fig. 11 is a graph showing physical properties of a topsheet and a core wrap sheet used in the verification of a core.
Fig. 12 is a 3 rd figure showing the test results.
Fig. 13 is an exploded perspective view of the diaper of embodiment 2.
Fig. 14 is a cross-sectional view of the diaper of embodiment 2, in which the center of the pad in the longitudinal direction is cut along the width direction.
Fig. 15 is a view showing a modification of the pad of the diaper of embodiment 2.
Detailed Description
Hereinafter, an absorbent article according to an embodiment of the present invention will be described with reference to the drawings. The configurations of the following embodiments are examples, and the present invention is not limited to the configurations of these embodiments.
< embodiment 1 >
In the present embodiment, a tape (tape) type disposable diaper (which is an example of an "absorbent article" referred to in the present application and will be hereinafter simply referred to as "diaper") is configured such that a direction connecting a front torso disposed facing an abdomen of a wearer and a rear torso disposed facing a back of the wearer is defined as a longitudinal direction. The crotch portion disposed in the crotch of the wearer (disposed opposite to the crotch) is located between the front body (one side in the longitudinal direction) and the rear body (the other side in the longitudinal direction) (the center in the longitudinal direction). In a state where the diaper is worn on a wearer (hereinafter, simply referred to as a "worn state"), a side facing the skin of the wearer (an inner side in the worn state) is referred to as a skin surface side, and an opposite side to the skin surface side (an outer side in the worn state) is referred to as a non-skin surface side. The direction connecting the skin surface side and the non-skin surface side is defined as the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is defined as the width direction. In addition, the plane view is taken as viewed from the thickness direction.
Fig. 1 is a perspective view of a diaper of the present embodiment. The diaper 1 has: a crotch region 1B corresponding to a crotch region covering a pudendum of a wearer in a worn state; a front bodice region 1F, which is a portion located on the front side of the crotch region 1B and corresponding to the front bodice of the wearer; and a rear torso region 1R located on the rear side of the crotch region 1B and corresponding to the rear torso of the wearer. The rear trunk region 1R has left and right edges provided with tapes 2L and 2R that can be attached to front patches (front patch)2F provided on the non-skin surface side of the front trunk region 1F. Thus, when the tapes 2L and 2R are attached to the front patch 2F in a state where the front torso region 1F is disposed on the abdominal side of the wearer and the rear torso region 1R is disposed on the back side of the wearer, the diaper 1 is fixed to the body of the wearer in a state of surrounding the abdominal circumference and the thighs of the wearer. Since the diaper 1 is fixed to the body of the wearer in this manner, the wearer can walk while standing with the diaper 1 worn.
The pad 6 capable of absorbing and holding liquid is disposed mainly in the vicinity of the crotch region 1B in the diaper 1. In the diaper 1, in order to suppress formation of a gap which becomes an outflow path of liquid between the diaper 1 and the skin of the wearer, the three-dimensional gathers 3BL, 3BR are provided at a portion surrounding the thighs of the wearer, and the waist gather 3R is provided at a portion surrounding the abdominal circumference of the wearer. The three-dimensional gathers 3BL, 3BR and the waist gather 3R are closely attached to the skin of the wearer by the elastic force of the linear rubber. Thus, the liquid excreted from the pudendal region of the wearer hardly leaks from the diaper 1 and is absorbed by the pad 6 of the diaper 1.
Fig. 2 is an exploded perspective view of the diaper 1. Fig. 3 is a cross-sectional view of the diaper 1 in a non-worn state, taken along the longitudinal center thereof and cut along the width direction. The diaper 1 has a cover sheet 4 which forms an outer surface in a worn state. The cover sheet 4 is a sheet-like member having a substantially rectangular appearance and provided with the constrictions 4KL and 4KR at positions corresponding to the long sides, and forms the exterior surface of the diaper 1. The narrowed portions 4KL and 4KR are provided at the positions of the thighs of the wearer. The cover sheet 4 is provided for reinforcing the back sheet 5 and improving the texture, and for example, a nonwoven fabric made of a liquid impermeable thermoplastic resin can be used as a material thereof in order to suppress leakage of excrement. Examples of the liquid impermeable thermoplastic resin include Polyethylene (PE), polypropylene (PP), and the like. The cover sheet 4 is not limited to a single-layer structure, and may have a multilayer structure including an inner cover sheet and an outer cover sheet.
The diaper 1 further includes a back sheet 5, a pad 6, and a top sheet 7 laminated in this order on the skin surface side of the cover sheet 4. The back sheet 5, the mat 6, and the top sheet 7 are sheet-like members having a substantially rectangular appearance, and are stacked on the cover sheet 4 in this order with the longitudinal direction thereof aligned with the longitudinal direction of the cover sheet 4. The back sheet 5 is a sheet made of a liquid impermeable thermoplastic resin for suppressing leakage of excrement, similarly to the cover sheet 4. The top sheet 7 is a sheet-like member disposed on the skin surface side of the wearer so as to cover the water absorption surface of the pad 6. The topsheet 7 has liquid permeability in a part or the whole thereof. Thus, in a state in which the diaper 1 is worn, liquid excreted from the wearer enters the pad 6 through the top sheet 7 that can come into contact with the skin of the wearer, where it is absorbed. For example, woven cloth, nonwoven cloth, and porous film can be used as the material of the top sheet 7. The topsheet 7 may also have hydrophilic properties.
The backsheet 5, the cushion 6, and the topsheet 7 all extend from the front bodice area 1F to the rear bodice area 1R. Thus, when the private parts of the wearer are covered with the cover sheet 4 in which the back sheet 5, the mat 6, and the top sheet 7 are laminated, both end portions in the longitudinal direction of the back sheet 5, the mat 6, and the top sheet 7 are positioned on the abdomen side and the back side of the wearer. That is, the wearer's pudendal region is covered with the pad 6 from the abdomen side to the back side of the wearer. Therefore, regardless of which posture the wearer takes the belly down or the back down to drain the liquid to the outside of the body, the drained liquid contacts the pad 6 via the top sheet 7.
The diaper 1 further includes elongated belt- like side sheets 8L and 8R for forming the above-described three-dimensional gathers 3BL and 3 BR. The side sheets 8L and 8R are liquid-impermeable sheets provided on the long side portions of the top sheet 7. In the side sheets 8L and 8R, similarly to the three-dimensional gathers 3BL and 3BR of the diaper 1, narrowed portions 8KL and 8KR are provided at positions where the thighs of the wearer are located. Linear rubbers 8EL and 8ER are knitted into the side sheets 8L and 8R along the longitudinal direction. Accordingly, when the diaper 1 is in a worn state, that is, the diaper 1 is in a U-shape in side view, the side sheets 8L and 8R are pulled up in the longitudinal direction by the contraction force of the linear rubbers 8EL and 8ER and rise from the top sheet 7, thereby forming three-dimensional gathers that prevent liquid from flowing out.
Further, the linear rubber 9ER for forming the waist gather 3R is provided between the back sheet 5 and the top sheet 7 at a position further on the back side than the end of the pad 6. The linear rubber 9ER is provided between the back sheet 5 and the top sheet 7 with the longitudinal direction in the stretching direction facing the lateral direction of the diaper 1. Thus, when the belts 2L, 2R provided on both the left and right sides of the linear rubber 9ER are attached to the front patch 2F on the abdominal side of the wearer, the linear rubber 9ER exerts a contractive force to bring the diaper 1 into close contact with the wearer, thereby preventing a gap from being formed between the diaper 1 and the abdominal circumference of the wearer. The cover sheet 4 is also provided with linear rubbers 4SL and 4SR along the longitudinal direction to prevent a gap from being formed between the diaper 1 and the abdominal circumference of the wearer. The linear rubbers 4SL and 4SR are provided at appropriate positions in an appropriate number determined in accordance with the elastic force (contraction force) required for the design of the diaper 1.
The mat 6 has a structure in which a particulate Absorbent resin such as SAP (Super Absorbent Polymer) which is a hydrophilic Polymer having a crosslinked structure and is capable of absorbing and retaining water is retained in gaps between short fibers of cellulose-based fibers such as pulp fibers, rayon fibers and cotton fibers or short fibers obtained by hydrophilization treatment of synthetic fibers such as polyethylene, polypropylene and polyethylene terephthalate. Thus, in the mat 6, the volume change of the absorbent resin before and after the absorption of the liquid is basically performed in the short fibers holding the absorbent resin in the gaps. Therefore, when the entire pad 6 is viewed in overhead view, the expansion rate of the thickness of the pad 6 having absorbed the liquid is not as high as the expansion rate of the absorbent resin itself.
The SAP particles of the present embodiment are particles obtained by granulating a resin composition containing an SAP. The "resin composition containing an SAP" referred to herein is a concept including both a composition composed of only an SAP and a composition containing an SAP as a main component and other substances therein to such an extent that the water absorbability is not adversely affected. Examples of the "other substances" include additives (such as a surface modifier added for the purpose of hydrophobizing the particle surface), unreacted monomers remaining during synthesis of the SAP, and the like.
As shown in fig. 3, the mat 6 of the above embodiment is obtained by coating a core 6C (an example of an "absorbent body" in the present application) in which SAP is mixed with pulp (so-called "fluff pulp") after pulverization with a core-covering sheet 6W. In the diaper 1, the skin surface side surface (corresponding to the "wearer side surface" in the present application) of the core 6C is covered with a laminate portion in which a part of the core wrap sheet 6W covering the core 6C is overlapped with the top sheet 7 covering the core 6C covered with the core wrap sheet 6W. Since both the core-covering sheet 6W and the top sheet 7 are liquid-permeable sheets, the laminated portion has liquid permeability. In this laminated portion, 1 or more sheets (an example of the "predetermined member" referred to in the present application) may be provided between the top sheet 7 and the core wrap sheet 6W. The core 6C may have a 1-layer structure, or may have a multilayer structure having 2 or more layers, and in the latter case, at least any one of the layers may be a layer composed of SAP particles. If such a layer composed of SAP particles is provided, the pad 6 quickly absorbs the moisture of urine or watery feces discharged from the wearer, and the time during which the moisture comes into contact with the skin of the wearer can be suppressed as much as possible. In the case where the core 6C has, for example, a total 3-layer structure of 2 layers made of pulverized pulp and SAP layers disposed between these layers, the SAP layer as the intermediate layer is disposed between the upper and lower layers, and therefore moisture can be diffused by capillary phenomenon, and the absorption and retention of moisture by the SAP is performed in this region, so that contact of moisture to the skin of the wearer due to the reverse flow of moisture absorbed by the core 6C can be suppressed.
In the diaper 1 of the present embodiment, the ventilation resistance of each member in the laminated portion of the core wrap sheet 6W and the top sheet 7 covering the skin surface side surface of the core 6C is smaller than 0.0962kPa sec/m. The air flow resistance was measured by an air flow tester (KES-F8-AP1) manufactured by Kyowa Kagaku K.K. In the diaper 1 of the present embodiment, the static friction coefficient of the surface of the top sheet 7 is 0.59 or more. Therefore, the diaper 1 of the present embodiment is superior in absorbency when watery urine is excreted, as follows, to the diaper of the comparative example in which the air resistance and the static friction coefficient are outside the ranges.
< verification of liquid flow >
Fig. 4 is a diagram illustrating a method of an experiment for verifying the absorbency of watery feces. In this test, a pad having a lateral width of 280mm and a length of 560mm was used as a test sample corresponding to the pad 6. Then, on the inclined surface with the inclination angle of 30 degrees, the mat was placed in a direction in which the longitudinal direction was aligned with the vertical direction of the inclined surface, and the reagent 50g simulating the watery feces was dropped onto the mat at a position spaced apart from the lower end of the mat by 450 mm. Then, in this verification, the distance (diffusion length) over which the reagent simulating the watery feces flows on the pad surface and the amount absorbed by the pad were confirmed. In this validation, the test specimen in which 50g of the reagent was completely absorbed by the pad and the diffusion length was shorter was excellent.
In this test, 10 kinds of test samples were prepared, and the absorbencies thereof were compared. The 10 types of test specimens were different from each other in the type of the core-covering sheet covering the cores, and the cores were common. The cores all contain no SAP and have a basis weight of 260g/cm2The pulp (transverse width of 280mm and length of 560 mm). Fig. 5 is a diagram showing the kind of core wrap sheet of the test sample prepared in the present verification.
In fig. 5, the test samples corresponding to the mat 6 of the above embodiment among the 10 types of test samples are referred to as "examples 1 to 6", and the test samples corresponding to the comparative examples are referred to as "comparative examples 1 to 4".
In examples 1 to 3 and comparative example 4, a nonwoven fabric produced by an air through method was used for the core wrap sheet. The nonwoven fabric of the hot air method is formed by carding (opening) fibers as raw materials and then thermally fusing the fibers by hot air treatment. As for the basis weight of the core wrap sheet, examples 1 and 3 were 20.0g/m2Example 2 is 22.0g/m2Comparative example 4 is 21.0g/m2。
In examples 4 and 5, a nonwoven fabric produced by a spunbond method was used for the core wrap sheet. As for the basis weight of the core wrap sheet, example 4 was 18.0g/m2Example 5 is 17.5g/m2. The spunbonded nonwoven fabric is formed by "carding fibers as a raw material, winding the fibers with high-pressure water to form a sheet, and drying the sheet".
In comparative examples 1 to 3 and example 6, a tissue (English) was used for the core wrap sheet. As for the basis weight of the paper towel, the basis weight of comparative example 1 was 19.5g/m2Comparative example 2 is 16.0g/m2Comparative example 3 is 14.0g/m2Example 6 is 14.0g/m2。
The reagent used in this examination was prepared by adding bentonite to ion-exchanged water and stirring, and the reagent within 3 days after the preparation was used as a simulant of water samples. The water content of the reagent was 94% by weight (for example, 940g of water and 60g of bentonite were mixed in the case of 1kg of the reagent).
The absorption of water-like feces was verified for the 10 types of test samples, and the results of examples 1 to 6 were better than those of comparative examples 1 to 4. Fig. 6 is a graph 1 showing the test results. The column entitled "diffusion range" in fig. 6 shows a photograph taken of the surface of a test specimen. In addition, the column of "diffusion length" in fig. 6 indicates the distance from the position where the reagent drops to the position where the reagent flows on the surface of the pad. The column entitled "leakage amount" in fig. 6 indicates the amount of reagent that has leaked from the mat. The phrase "no leakage" in the column of "leakage amount" in fig. 6 means that the whole reagent is absorbed by the pad.
As can be seen from fig. 6: in each of comparative examples 1 to 4, the reagent flowed over a distance longer than 450mm and flowed out of the pad. On the other hand, in all of examples 1 to 6, the reagent stayed within 450mm and did not flow out to the outside of the pad. In particular, in examples 1 to 3 in which the nonwoven fabric produced by hot air was used for the core wrap sheet, it was confirmed that: the maximum distance that the reagent flowed was 138mm or less, and the absorbability of the water-like feces was significantly higher than in comparative examples 1 to 4. In examples 4 and 5 in which a nonwoven fabric produced by a spunbond method was used for the core wrap sheet, it was also confirmed that: although inferior to examples 1 to 3, the absorption of water-like feces was higher than that of comparative examples 1 to 4. In addition, example 6 using a paper towel for the core wrap sheet also confirmed that: as in examples 1 to 3, the absorbability of watery feces was remarkably high.
The physical properties of the respective materials used as the core wrap sheet in the above-described test samples were confirmed, and the confirmation results are shown below. Whether or not watery stool stays on the surface of the core wrap sheet without flowing out of the mat is considered to be largely influenced by the 2 elements of the size of the fine opening formed by the material mainly covering the surface of the core and the friction coefficient of the surface of the top sheet. In this confirmation, 2 points of the air permeability (air flow resistance) and the friction coefficient of the material surface, which are considered to have a direct correlation with the size of the opening, were confirmed.
< air permeability >
In the above verification, the reagent was dropped directly onto the core wrap sheet without disposing the top sheet. However, in this confirmation, the ventilation resistance of each member in the laminated portion of the top sheet and the core wrap sheet was confirmed in a form closer to the actual use form. However, since the differences in the air flow resistance of the core wrap sheets of comparative examples 1 to 6 and comparative examples 1 to 4 are the purpose of the present confirmation, the same nonwoven fabric (KNT 20 manufactured by RNP) was used as the top sheet to be superimposed on each core wrap sheet. The air flow resistance was measured by using an air flow tester (KES-F8-AP1) manufactured by Kyowa Kagaku K.K. Fig. 7 is a graph 1 showing the measurement results of the ventilation resistance. Fig. 8 is a graph 2 showing the measurement results of the ventilation resistance.
As can be seen from fig. 7, it was confirmed that: in each of examples 1 to 6, the air flow resistance of each member in the laminated portion was smaller than 0.0962kPa · sec/m. On the other hand, in each of comparative examples 1 to 3, the air flow resistance was 0.0962kPa sec/m or more. Thus, it can be seen that: when the liquid-permeable sheet covering the skin surface side of the core has an air flow resistance of at least 0.0962kPa sec/m, the watery liquid adhering to the surface of the top sheet rapidly permeates through the sheet and is absorbed by the absorbent body. In addition, as can be seen from fig. 7: the liquid-permeable sheet covering the skin surface side of the core more preferably has an air flow resistance of at least 0.0352kPa sec/m.
In addition, as can be seen from fig. 8: in all the liquid-permeable sheets covering the skin surface side of the core, if the air flow resistance is 0.0050kPa · sec/m or more, SAP leakage does not occur. Regarding "SAP leakage" in fig. 8, the operation of closing and separating the ends in the longitudinal direction by holding the ends in the longitudinal direction with a tape, and patting was repeated 3 times, and SAP leakage was considered to be present when SAP particles dropped 20 particles or more, and no SAP leakage was considered to be present when SAP particles dropped 19 particles or less. The "strength" in fig. 8 is a result of confirming the presence or absence of cracking by visual observation after wearing a test subject having an appropriate body shape for 5 hours according to the regulations of the day and the guard.
From this confirmation result, it is considered that: an absorbent article having a ventilation resistance of each member in the range of 0.0050 to 0.0962kPa · sec/m in the core wrap sheet covering the skin surface side surface of the absorbent body and the laminated portion of the top sheet as in the diaper 1 of the above embodiment is superior in absorbency when watery body is excreted compared to an absorbent article outside the range, and has practical strength.
< coefficient of static Friction >
Next, the results of confirming the static friction coefficient of the top sheet surface will be described. The static friction coefficient was measured using a surface texture measuring machine (TriboGeartYPE: 14DR) manufactured by Xindong scientific Co. The measurement method followed JISK 7125. In this confirmation, in order to verify the influence of the static friction coefficient of the surface of the top sheet on the absorption of watery feces, in example 1 in which the absorption of watery feces was most excellent in the above-described verification, the above-described verification of the liquid flow was performed in a state in which a plurality of top sheets having different static friction coefficients were stacked. Fig. 9 is a 2 nd graph showing the test results.
The materials of the top sheets of the test piece shown in fig. 9 were spun-bonded nonwoven fabrics produced in this order from the left side: basis weight of 16.0g/m2Nonwoven fabric produced by spun bond method: basis weight of 18.0g/m2Nonwoven fabric produced by spun bond method: basis weight of 20.0g/m2The non-woven fabrics made by the hot air method: basis weight of 25.0g/m2The non-woven fabrics made by the hot air method: basis weight of 22.0g/m2The non-woven fabrics made by the hot air method: eye payment of 20.0g/m2The non-woven fabrics made by the hot air method: basis weight of 18.0g/m2The non-woven fabrics made by the hot air method: basis weight of 16.0g/m2。
As can be seen from fig. 9: in the top sheet having a static friction coefficient of 0.59 or more, the reagent stays within 450mm and does not flow out to the outside of the pad. On the other hand, in the top sheet having a static friction coefficient of 0.34 or less on the surface thereof, the reagent flows over a distance longer than 450mm, and flows out to the outside of the pad. Thus, it is believed that: when the static friction coefficient of the surface of the top sheet is 0.59 or more, the absorbency in the case where watery feces are excreted is superior to that of an absorbent article having a static friction coefficient of less than 0.59.
In the above embodiment, the tape-type disposable diaper is exemplified, but the present invention can be applied to absorbent articles of other forms. Examples of such absorbent articles include various types of absorbent articles with gathers such as underpants-type disposable diapers, diaper pads, and light incontinence pads, and flat absorbent articles without gathers.
From the above verification results, it can also be seen that: in the diaper 1 of the above embodiment, the air flow resistance of each liquid-permeable sheet in the laminated portion of the topsheet 7, the core wrap sheet 6W, and the like, which is interposed between the wearer and the core 6C, is smaller than 0.0962kPa · sec/m, so that moisture can rapidly move from the wearer to the core 6C. Further, since the static friction coefficient of the surface of the top sheet 7 is 0.59 or more, the solid components contained in watery stool do not easily slip on the surface of the top sheet 7. Therefore, in the diaper 1 of the above embodiment, the possibility of leakage of excrement when the diaper 1 is taken off from the wearer can be suppressed as much as possible by improving the absorption of watery feces.
Further, since the relationship between the static friction coefficient of the top sheet surface and the wearing sensation was measured, the results are shown below. Fig. 10 is a table showing the measurement results of the wearing sensation. Regarding the measurement of the wearing sensation, the selection of "no discomfort" or "discomfort" was examined for the absence of discomfort during wearing by 20 participants, and the evaluation was performed by the following criteria, and x and o were regarded as being acceptable.
Very good: when the "no discomfort feeling" is 16 or more and 20 or less people
O: when "no discomfort" is 11 or more and 15 or less persons
And (delta): when the "no discomfort feeling" is 6 or more and 10 or less people
X: when "no discomfort" is 0 to 5 persons inclusive
As shown in the measurement results of fig. 10, the following were confirmed with respect to the top sheet: the top sheet having a surface static friction coefficient smaller than 2.52 is preferable, and more preferably 1.91 or less, and still more preferably 0.98 or less.
From the result of the confirmation of the static friction coefficient as described above, it can be said that: the diaper 1 of the above embodiment is suitable regardless of the static friction coefficient of the top sheet surface, but more preferably, the static friction coefficient of the top sheet surface is 0.59 or more. In addition, it can be said that: it is further preferable that the static friction coefficient of the surface is smaller than 2.52.
Further, since the conditions of the core were verified, the results thereof are shown below. In the above verification, the cores were all SAP-free at a basis weight of 260g/cm2For this reason, in this test, a plurality of samples having different basis weights were prepared, and the absorbency of watery feces in each core was tested. Fig. 11 is a graph showing physical properties of a topsheet and a core wrap sheet used in the verification of a core. In this examination, the liquid flow was examined in a state in which the top sheet and the core wrap sheet having the physical properties shown in fig. 11 were superimposed on 4 types of cores having different amounts of pulp per unit area. Fig. 12 is a 3 rd figure showing the test results.
Each core of the test piece shown in FIG. 12 had a pulp amount per unit area of 40g/m in the order from the left2、50g/m2、60g/m2、70g/m2The pulp of (2) is formed. As can be seen from fig. 12: the amount of pulp in the core was 60g/m2In all of the above cases, the reagent stays within 450mm in the longitudinal direction, and does not flow out to the outside of the mat. On the other hand, the amount of pulp in the core is less than 60g/m2In the case of (2), the reagent flows in the longitudinal direction over a distance longer than 450mm, and flows out of the pad. In all of the 4 types, the reagent stayed below 100mm in the width direction. Thus, it is believed that: if the pulp content of the core is at least 60g/m2As described above, the water-based absorbent exhibits excellent absorbency when a sample of water is excreted. In addition, it is considered that: if the core is inThe length of the pad is at least 500mm or more in the longitudinal direction and at least 100mm or more in the width direction, and the excreted water sample does not flow out to the outside of the pad. The length in the width direction may be 150mm or more, and more preferably 200mm or more, in consideration of positional displacement in the width direction at the time of wearing, personal differences in the size of the buttocks of the wearer, and the like. In order to make the feces and urine absorbed by the pad less likely to contact the skin by the gaps formed between the top portions of the right and left buttocks, it is effective to make the length in the width direction slightly longer, and for example, the core may be present up to the right and left ends of the crotch region 1B of the diaper 1.
From the above verification results, it is considered that: if the core 6C is made of pulp with a weight of 60g/m2When the diaper 1 is formed of pulp having a size of 500mm or more in the longitudinal direction and 100mm or more in the width direction as described above, the static friction coefficient of the surface of the top sheet 7 is 0.59 or more, and the air flow resistance of each member in the laminated portion where the core wrap sheet 6W and the top sheet 7 are overlapped is smaller than 0.0962kPa sec/m, the absorption properties of watery feces are improved. Such effect of improving the absorption of watery feces is based on the synergistic effect of the permeability of moisture in the laminated portion where the core wrap sheet 6W and the top sheet 7 overlap and the absorption of watery feces in the core 6C located below the laminated portion.
< embodiment 2 >
Hereinafter, embodiment 2 will be described. In the present embodiment, only differences from embodiment 1 will be described, and other configurations, effects, and various verification results (liquid flow, absorbency of watery feces, air flow resistance of each member in the laminated portion of the top sheet and the core wrap sheet, static friction coefficient of the top sheet surface, core conditions, and the like) are the same as those of embodiment 1.
Fig. 13 is an exploded perspective view of the diaper of embodiment 2. In embodiment 2, an elongated recess 6U extending along the center line in the longitudinal direction of the pad 6 is formed in the skin surface side surface of the pad 6 and the top sheet 7. The concave portion 6U is a portion where the surface of the pad 6 on the skin surface side and the top sheet 7 are recessed in a concave shape. This allows the excrement of the wearer to be discharged toward the recessed portion 6U or the periphery thereof, and then absorbed into the pad 6 or/and attached to the skin surface side of the top sheet 7. Details of the recess 6U will be described later.
Fig. 14 is a cross-sectional view of the diaper of embodiment 2, in which the center in the longitudinal direction of the pad 6 is cut along the width direction. Fig. 14 illustrates a cross section of the mat 6 in a state stretched in the thickness direction for easy understanding. As shown in fig. 14, the core 6C has a multilayer configuration. That is, the core 6C includes an upper core 6CU disposed on the top sheet 7 side and a lower core 6CL disposed on the back sheet 5 side. The core wrap sheet 6W surrounds the upper core 6CU and the lower core 6CL so as to cover the entire upper core 6CU and the lower core 6 CL. Thus, the upper layer portion of the core wrap sheet 6W is disposed between the top sheet 7 and the upper core 6 CU. The lower layer portion of the core wrap sheet 6W is disposed between the backsheet 5 and the lower layer core 6 CL. For the core wrap sheet 6W, for example, tissue paper such as toilet paper (english: tissue paper), nonwoven fabric, or the like is used. Further, in the diaper 1 of the present embodiment, the entire core 6C is wrapped with the core wrap sheet 6W, so that liquid such as urine can be diffused over the entire surface of the core 6C and absorbed by the entire core 6C. In addition, the core 6C can absorb urine relatively quickly in comparison with the lower core 6CL in the upper core 6CU disposed on the side of the top sheet 7 after the liquid such as urine is excreted.
As the upper core 6CU and the lower core 6CL, fluff pulp obtained by pulverizing fibrous materials such as conifers, SAP particles, hydrophilic sheets, or a combination thereof is used. The SAP particles absorb about 100-1000 times of the liquid of the dead weight. As the SAP particles, for example, a granular material having a diameter of about 0.1 to 0.5mm in a state before liquid absorption is used.
The core 6C is provided with an upper layer opening 6KU formed to penetrate the upper layer core 6CU in the thickness direction. The upper layer opening 6KU is formed to extend in the longitudinal direction of the upper layer core 6 CU. Further, upper layer opening 6KU is formed substantially at the center in the width direction of upper layer core 6 CU. In addition, the upper opening 6KU has a rectangular shape with front and rear ends formed in an arc shape in a plan view. The front end of the upper opening 6KU is located in the middle of the front trunk area 1F, and the rear end of the upper opening 6KU is located in the front of the rear trunk area 1R. Since the upper layer opening 6KU is formed in the upper layer core 6CU of the core 6C, the above-described concave portion 6U is formed in the skin surface side surface of the core wrap sheet 6W covering the core 6C, that is, the skin surface side surface of the pad 6 and the top sheet 7.
Since the recess 6U is formed by the upper opening 6KU provided in the upper core 6CU, all or a part of the solid components and feces contained in the watery stool excreted by the wearer are contained in the recess 6U. This suppresses leakage of solid components and feces from the diaper 1. Since the upper layer opening 6KU is formed in the upper layer core 6CU of the core 6C, a liquid such as urine excreted by the wearer flows and spreads in the upper layer opening 6 KU. Further, the liquid such as urine excreted onto the upper core 6CU can be guided to the lower core 6CL through the upper opening 6 KU. In this way, the diaper 1 of the present embodiment can absorb and hold liquid by the core 6C having the upper core 6CU and the lower core 6 CL.
The diaper 1 further includes SAP layers 6SL and 6SR disposed between the upper core 6CU and the lower core 6 CL. The SAP layers 6SL, 6SR are formed by aggregating a plurality of particles of a Super Absorbent Polymer (SAP). The SAP layer 6SL, 6SR comprises a plurality of particles of SAP, capable of absorbing and retaining the liquid directed between the upper core 6CU and the lower core 6 CL. As shown in fig. 4, the SAP layer 6SL is disposed on the left of the upper layer opening 6KU, and the SAP layer 6SR is disposed on the right of the upper layer opening 6 KU. Further, the SAP layers 6SL, 6SR are arranged on both sides of the upper layer opening 6KU so as to extend along the longitudinal direction of the upper layer opening 6KU in a plan view of the core 6C from the skin surface side. Further, the SAP layers 6SL, 6SR are formed in a rectangular shape in a plan view of the core 6C from the skin surface side. The SAP layers 6SL and 6SR may be formed in other polygonal shapes, elliptical shapes, rather than rectangular shapes in plan view. By providing the SAP layers 6SL, 6SR, the diaper 1 can increase the amount of liquid absorbed as a whole.
The SAP layers 6SL, 6SR are formed by spreading particles of SAP on the lower core 6 CL. In addition, the SAP layers 6SL, 6SR are sandwiched between the upper core 6CU and the lower core 6 CL. Therefore, even when the diaper 1 moves by the movement of the wearer, the particles of the SAP contained in the SAP layers 6SL and 6SR can be prevented from moving below the upper layer opening 6KU or falling out of the lower layer core 6 CL. By providing such SAP layers 6SL, 6SR, moisture is diffused between the upper core 6CU and the lower core 6CL by capillary action. When the SAP layers 6SL and 6SR absorb moisture and swell, the effective volume of the upper layer opening 6KU increases, and the absorption of moisture contained in excrement into the core 6C and the storage amount of solid matter in the recess 6U can be increased. Further, the moisture is absorbed by the SAP layers 6SL and 6SR between the upper core 6CU and the lower core 6CL, and thereby the moisture is absorbed and held at a position distant from the skin of the wearer, and the contact of the moisture to the skin of the wearer due to the reverse flow of the moisture absorbed by the core 6C is suppressed.
In addition, the upper layer opening 6KU may be formed in other polygonal shapes, elliptical shapes, rather than rectangular shapes in plan view. The mat 6 may have an opening provided in the lower core 6CL in addition to the upper opening 6KU provided in the upper core 6 CU. Fig. 15 is a view showing a modification of the pad of the diaper of embodiment 2. As shown in fig. 15, the cushion 6 may have a lower opening 6KB similar to the upper opening 6KU provided in the upper core 6CU in the lower core 6 CL. In this case, the upper opening 6KU and the lower opening 6KB can be understood as openings of holes penetrating the core 6C in the thickness direction.
The opening forming the recess 6U is preferably set such that the width of the recess 6U is 10mm or more. This is because, if the width of the concave portion 6U is less than 10mm, not only the storage space as a solid component is insufficient, but only the opening portion of less than 10mm can be formed in the width of the concave portion 6U, and the top sheet 7 is less likely to be dented. The width of the opening forming the recess 6U is preferably 40mm or less. This is because if the width of the concave portion 6U is larger than 40mm, the amount of urine absorption decreases. The recess 6U is preferably located within a radius of 40mm from the anus. This is because if the recess 6U is located more than 40mm away from the anus, there is a possibility that the feces and urine may not reach the recess 6U. The length of the recess 6U is preferably 100mm or more. This is because, when the length of the recess 6U is less than 100mm, the size of the recess 6U may be insufficient as a storage space for the solid component.
In embodiment 2, the same results as the various verification results of embodiment 1 are obtained. In addition, in < verification of liquid flow >, as in embodiment 1, a pad having a lateral width of 280mm and a length of 560mm was used as a test sample corresponding to the pad 6, but this pad corresponds to the modification shown in fig. 15, and has an opening having a width of 25mm and an opening having a width of 45mm from a supposed position facing the anus toward the upper side (back side) and 75mm toward the lower side (stomach side) in a worn state, as openings corresponding to the upper layer opening 6KU and the lower layer opening 6KB, a thickness of a portion corresponding to the upper layer core 6CU was set to 8mm, and a thickness of a portion corresponding to the lower layer core 6CL was set to 5 mm. The thickness is the thickness measured without applying any pressure to the mat. Further, similarly to embodiment 1, on the slope having the inclination angle of 30 degrees, the mat is placed in the direction in which the longitudinal direction coincides with the vertical direction of the slope, and the reagent 50g simulating the feces of watery stool is dropped onto the mat at a position spaced apart from the lower end of the mat by 450 mm. The other verification results are the same as those of embodiment 1.
Description of the reference numerals
1. diaper
1B · crotch region
1F. anterior greater region
1R · posterior greater region
2F. anterior patch
2L, 2 R.tape
3BL, 3BR · stereoscopic pleat
3 R.waist gather
4. cover sheet
4KL, 4 KR. constriction
5. back sheet
6. cushion
6U. concave part
6 C.core
6 CU. upper core
6 CL.lower core
6 KU. Upper opening
6KB · lower opening
6SL · SAP layer
6 SR. SAP layer
6 W.chip wrapping sheet
7. top sheet
8. side sheet
8KL, 8 KR. constriction
4SL, 4SR, 8EL, 8ER, 9 ER.cndot.
Claims (7)
1. An absorbent article to be worn in the crotch of a wearer, comprising:
an absorbent body; and
a liquid-permeable sheet covering the wearer-side surface of the absorbent body,
the absorbent has a pulp amount of 60g/m2A pulp core having a size of 500mm or more in the longitudinal direction and 100mm or more in the width direction,
the liquid-permeable sheet has a static friction coefficient of 0.59 to 0.98 on the surface thereof which comes into contact with the wearer,
the liquid-permeable sheet has a laminated portion in which a part of a core wrap sheet (6W) that wraps the absorbent body is overlapped with a top sheet that covers the absorbent body wrapped with the core wrap sheet (6W), and the air flow resistance of each member in the laminated portion is smaller than 0.0352kPa sec/m,
the absorbent body has an opening portion that forms a concave portion (6U) in the liquid-permeable sheet by opening toward the liquid-permeable sheet,
the opening is formed at substantially the center in the width direction of the absorbent body.
2. The absorbent article according to claim 1,
the absorber has a length extending from a front bodice region (1F) located on the abdominal side of a wearer to a rear bodice region (1R) located on the back side via a crotch region (1B) located in the crotch in a state where the absorbent article is worn on the wearer,
the openings extend in the longitudinal direction of the absorbent body.
3. The absorbent article according to claim 1,
the absorbent body has a lower layer absorbent body and an upper layer absorbent body disposed on the topsheet side of the lower layer absorbent body,
the opening is an opening portion of a hole penetrating the upper layer absorbent body in a thickness direction.
4. The absorbent article according to claim 1,
the opening is an opening portion of a hole penetrating the absorbent body in a thickness direction.
5. The absorbent article according to any one of claims 1 to 4,
the liquid-permeable sheet has 1 or more predetermined members between the core wrap sheet (6W) and the top sheet, and the air flow resistance of the laminated portion in the predetermined members is less than 0.0352kPa sec/m, respectively.
6. The absorbent article according to any one of claims 1 to 4,
the absorbent body has at least 2 or more layers, and the layer on the wearer side contains a larger amount of SAP particles as superabsorbent polymers than the other layers.
7. The absorbent article according to any one of claims 1 to 4,
the absorbent body has more than 2 layers, at least any one of which is a layer of SAP particles.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018227313 | 2018-12-04 | ||
| JP2018-227313 | 2018-12-04 | ||
| JP2018227309 | 2018-12-04 | ||
| JP2018-227309 | 2018-12-04 | ||
| JP2019-217693 | 2019-12-02 | ||
| JP2019217694A JP7046896B2 (en) | 2018-12-04 | 2019-12-02 | Absorbent article |
| JP2019-217694 | 2019-12-02 | ||
| JP2019217693A JP7046895B2 (en) | 2018-12-04 | 2019-12-02 | Absorbent article |
| PCT/JP2019/047131 WO2020116415A1 (en) | 2018-12-04 | 2019-12-03 | Absorbent article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113164302A CN113164302A (en) | 2021-07-23 |
| CN113164302B true CN113164302B (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201980079674.6A Active CN113164302B (en) | 2018-12-04 | 2019-12-03 | Absorbent article |
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| CN (1) | CN113164302B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN217186765U (en) * | 2021-01-26 | 2022-08-16 | 王子控股株式会社 | Absorbent article manufacturing apparatus and absorbent article |
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