JP6605167B1 - Absorbent articles - Google Patents

Abstract

The present invention provides an absorbent article having an absorbent main body that suppresses the body of the wearer from being cooled and hardly discomforts the wearer. The absorbent article (1), wherein the absorbent main body (10) is disposed on the non-skin side of the liquid absorbent absorbent core (11) and the absorbent core (11), and the breathable film (13a) And a back sheet (13b), arranged on the skin side of the exterior sheet part (13) having a predetermined heat flow peak value Qmax under a certain temperature condition, and the absorbent core (11), the certain temperature And a top sheet (12) configured to have a heat flow peak value Qmax lower than the predetermined heat flow peak value Qmax under conditions. [Selection] Figure 5

Description

  The present invention relates to an absorbent article.

  As an example of an absorbent article, a pants-type disposable diaper having an absorptive main body is known. The absorbent main body generally includes a liquid absorbent absorbent core, a top sheet provided on the skin side of the absorbent core, and a breathable film and a back sheet provided on the non-skin side of the absorbent core. have. And it is desirable for each of these parts to have a structure that can easily maintain the transpiration effect with the wearer's body from the viewpoint of comfort during wearing. For example, in Patent Document 1, in an absorbent product provided with an air permeable back sheet, in order to reduce overheating and sweating of the obstructed part of the body, it is easy to maintain the natural transpiration of the wearer's skin, Techniques for improving wearer comfort are disclosed.

Special table 2018-524669

  In conventional absorbent articles, after the absorbent core absorbs liquid such as urine, the absorbent main body may be cooled by the heat of vaporization when the liquid vaporizes. In particular, when the absorbent article is worn in an environment where the outside air temperature is low (for example, when wearing a diaper in winter), the temperature of the absorber is further lowered by the outside air temperature through a breathable film or a back sheet. It was easy. In such a case, the wearer's body is cooled by the absorbent main body having a lowered temperature, which may cause discomfort to the wearer.

  The present invention has been made in view of the conventional problems as described above, and its purpose is to suppress the wearer's body from being cooled and to make the wearer less discomfort. It is providing the absorbent article provided with.

The main invention for achieving the above object is:
Having a vertical direction and a horizontal direction intersecting each other,
An absorbent article having an absorbent body,
The absorbent body is
A liquid-absorbent absorbent core,
An exterior sheet portion disposed on the non-skin side of the absorbent core, comprising a breathable film and a back sheet, and having a predetermined heat flow peak value Qmax;
A top sheet that is disposed on the skin side of the absorbent core and configured to have a heat flow peak value Qmax lower than the predetermined heat flow peak value Qmax;
It is an absorbent article characterized by having.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a wearer's body is cooled and can provide the absorbent article provided with the absorptive main body which is hard to give a wearer a discomfort.

1 is a schematic perspective view of a diaper 1. FIG. It is a top view of the diaper 1 of the expansion | deployment and expansion | extension state. It is a schematic sectional drawing in line AA shown in FIG. It is a figure explaining the movement of the heat which arises in the absorptive main body 110 of a comparative example. It is a figure explaining the movement of the heat which arises in the absorptive main body 10 of this embodiment. It is the table | surface which put together the result of having measured Qmax value about several types of sheet | seat members. It is a schematic sectional drawing expressed about the surface shape of the top sheet 12 of this embodiment. 4 is a schematic cross-sectional view illustrating a modified example of the absorbent main body 10. FIG.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
An absorbent article having an up-down direction and a left-right direction intersecting each other, and having an absorbent main body, the absorbent main body being a liquid-absorbent absorbent core and a non-skin side of the absorbent core An exterior sheet portion having a predetermined heat flow peak value Qmax under a certain temperature condition, and disposed on the skin side of the absorbent core, and arranged under the certain temperature condition. And a top sheet configured to have a heat flow peak value Qmax lower than the predetermined heat flow peak value Qmax.

  According to such an absorbent article, even if the heat transfer through the top sheet is reduced between the absorbent core and the skin of the wearer and the temperature of the absorbent core is lowered, the coldness is worn. It becomes difficult to let people feel. On the other hand, heat transfer through the exterior sheet portion increases between the absorbent core and the outside air, and moisture of the absorbent core is easily evaporated to the outside air side. Thereby, it can suppress that a wearer's body is cooled and can provide the absorbent article provided with the absorptive main body which is hard to give a discomfort to a wearer.

  In this absorbent article, it is desirable that the absorbent main body has the top sheet, the absorbent core, and the exterior sheet portion laminated in the thickness direction at least in the crotch portion of the wearer.

  According to such an absorbent article, it is possible to easily suppress heat exchange occurring on the skin side of the wearer at the crotch portion where the wearer's excretion opening is located. Therefore, it is difficult for the wearer's body to be cooled in the crotch part, and it is difficult for the wearer to cause discomfort.

  In such an absorbent article, the area of the portion where the top sheet, the absorbent core, and the exterior sheet portion are laminated in the thickness direction on the rear side of the longitudinal center of the absorbent core Is larger than the area of the portion where the top sheet, the absorbent core, and the exterior sheet portion are laminated in the thickness direction on the front side of the longitudinal center of the absorbent core. desirable.

  According to such an absorbent article, in the buttocks region, which is a region on the rear side of the center in the longitudinal direction, the surface area is wide, and the absorbent main body is easily pressed against the worn body when the wearer sits down, It becomes easy to suppress heat exchange that occurs between the skin and the absorbent core. Therefore, in the buttocks region, it is difficult for the wearer to feel cold and it is difficult to give discomfort.

  In such an absorbent article, it is desirable that the top sheet is a nonwoven fabric.

  According to such an absorbent article, since the fibers constituting the nonwoven fabric are entangled with each other and a large number of voids are formed between the fibers, heat transfer in the thickness direction is easily hindered by the voids inside the nonwoven fabric. Become. Therefore, the heat insulation performance of the top sheet is enhanced and the wearer's body can be hardly cooled.

  In such an absorbent article, the thickness of the top sheet is desirably larger than the thickness of the exterior sheet portion.

  According to such an absorbent article, compared to the exterior sheet portion, the top sheet makes it difficult for heat to pass through in the thickness direction, so the top sheet is interposed between the absorbent core and the wearer's body. Less heat transfer. Thereby, a wearer's body can be made hard to cool.

  In such an absorbent article, the top sheet has a convex portion protruding to one side in the thickness direction and a concave portion provided between the two convex portions adjacent in the left-right direction. It is desirable.

  According to such an absorbent article, since the unevenness is provided on the surface of the top sheet, the area of the portion where the top sheet and the wearer's body come into contact can be reduced. Thereby, the heat insulation performance of a top sheet improves and it can make it hard to cool a wearer's body.

  In such an absorbent article, it is desirable that the convex portion has a narrower width in the left-right direction toward the skin side in the thickness direction.

  According to such an absorbent article, compared with the case where the width | variety of a convex part does not become narrow, a contact area with a wearer's skin becomes smaller and the heat insulation performance of a top sheet improves. Moreover, the movement of heat is suppressed by the space formed between the convex portions adjacent to each other in the left-right direction, and a higher heat insulating effect is easily exhibited. Thereby, it can be made hard to feel cold by a wearer.

  In such an absorbent article, it is preferable that a second sheet is provided between the top sheet and the absorbent core.

  According to such an absorbent article, by providing the second sheet, heat transfer between the absorbent core and the wearer's body is more easily suppressed on the skin side of the absorbent core. Thereby, it can be made hard to feel cold by a wearer.

  In such an absorbent article, the absorbent core has a constricted portion having a narrow width in the left-right direction between one end portion in the longitudinal direction and the other end portion in the stretched state. It is desirable.

  According to such an absorbent article, the surface area of an absorptive core becomes small compared with the case where the width of an absorptive core is constant. Therefore, when the absorbent article is worn, the contact area between the wearer's body and the absorbent core is reduced, and heat transfer can be reduced between the absorbent core and the wearer's skin. Thereby, it can be made hard to make a wearer feel cold.

  In such an absorbent article, it is preferable that the absorbent core has a high-density portion in which the density of the absorbent core is higher than the density of the surrounding area.

  According to such an absorbent article, an absorptive core becomes difficult to contact a wearer's body in the field in which a high-density part is provided. Therefore, compared with the case where a high-density part is not provided, a contact area with a wearer's skin becomes small and heat transfer can be decreased between an absorptive core and a wearer's skin. Thereby, it can be made hard to make a wearer feel cold.

  In such an absorbent article, it is desirable that the absorbent core has a low basis weight region in which the basis weight of the absorbent core is lower than the surrounding basis weight.

  According to such an absorbent article, in the part in which the low basic weight area is provided, the absorbent core is hardly pressed against the wearer's body when the absorbent article is worn. Therefore, compared with the case where the low basic weight area | region is not provided, a contact area with a wearer's skin becomes small and heat transfer can be decreased between an absorptive core and a wearer's skin. Thereby, it can be made hard to make a wearer feel cold.

=== Embodiment ===
As an absorbent article according to the present embodiment, a pants-type disposable diaper 1 (hereinafter simply referred to as “diaper 1”) will be described as an example. However, the absorbent article is not limited to a pants-type disposable diaper, and may be a sanitary short or a panty liner.

<Configuration of pants-type disposable diaper 1>
FIG. 1 is a schematic perspective view of a pants-type disposable diaper 1. FIG. 2 is a plan view of the diaper 1 in the unfolded and extended state. FIG. 3 is a schematic cross-sectional view taken along line AA shown in FIG.

  The diaper 1 has an up-down direction, a left-right direction, and a front-rear direction that intersect each other in the pant-type state shown in FIG. 1, and a waistline opening BH and a pair of leg-hole openings LH are formed. In the vertical direction, the waistline opening BH side is the upper side, and the crotch side is the lower side. In addition, as shown in the cross-sectional view of FIG. 3, the direction in which the materials constituting the diaper 1 are stacked is referred to as the thickness direction, and the side in contact with the wearer's body (skin) in the thickness direction is referred to as the skin side. The side that does not contact the wearer's body (skin) is referred to as the non-skin side.

  In addition, the “extended state” of the diaper 1 refers to the entire diaper 1 (the entire product) by extending each elastic member (for example, the leg elastic member 17 and the thread-like elastic members 23 and 33 described later) included in the diaper 1. ) In a fully extended state, specifically, the dimensions of each member constituting the diaper 1 (for example, the absorbent main body 10 and the belt portions 20 and 30 described later) coincide with the dimensions of the member itself. It means a state where it has been extended to a size close to that.

  The diaper 1 includes an absorbent main body 10, a front belt portion 20, and a rear belt portion 30 that are three members having a rectangular shape in plan view. The front side belt part 20 (abdominal side waistline part) is a site | part applied to a wearer's abdominal side part at the time of wearing of the diaper 1, and the back side belt part 30 (back side waistline part) is a wearer at the time of wearing the diaper 1. It is a part applied to the dorsal side.

  In the diaper 1 in the unfolded state shown in FIG. 2, the front belt portion 20 and the rear belt portion 30 are arranged such that their longitudinal directions are along the left-right direction (width direction in FIG. 2) of the diaper 1. And the front end part of the longitudinal direction of the absorptive main body 10 is arrange | positioned in the center part of the front side belt part 20 in the left-right direction, and the longitudinal direction of the absorptive main body 10 is located in the center part of the rear side belt part 30 in the left-right direction. A rear end is disposed.

  In the unfolded diaper 1 shown in FIG. 2, the absorbent main body 10 is folded in half at a predetermined position FL in the longitudinal direction so that the longitudinal direction of the absorbent main body 10 is along the vertical direction of the diaper 1. And the rear belt portion 30 are joined at both ends in the left-right direction using a joining means such as thermal welding or ultrasonic welding, so that a pair of side joining regions 2 are formed. Thereby, the diaper 1 will be in the pants-type state (refer FIG. 1) which has the trunk periphery opening part BH and a pair of leg periphery opening part LH. Note that the predetermined position FL is the lower end in the vertical direction and the center in the front-rear direction in the diaper 1 in the pant-type state.

(Absorbent body 10)
As shown in FIG. 3, the absorbent main body 10 includes an absorbent core 11, a liquid-permeable top sheet 12 disposed on the skin side of the absorbent core 11, and a non-skin side of the absorbent core 11. And an exterior sheet portion 13 that is disposed and forms an exterior of the absorbent main body 10. Moreover, a pair of leak-proof wall part 50 is provided in the both sides of the left-right direction of the absorptive core 11. As shown in FIG.

  The absorbent core 11 is a part that absorbs and retains excretory fluid such as urine, and liquid absorbent fibers such as pulp containing a superabsorbent polymer (SAP) are formed into a predetermined shape. In addition, as shown in FIG. 3, the outer peripheral surface of the absorptive core 11 is covered with the core wrap sheet | seat 11a. The core wrap sheet 11a is formed of tissue paper, for example. However, the core wrap sheet 11a is not necessarily provided.

  The absorbent core 11 of the present embodiment has an end portion on one side between an end portion 11ef on one side (front side) in the longitudinal direction and an end portion 11eb on the other side (rear side) in the stretched state as shown in FIG. 11ef and the other end portion 11eb have a constricted portion 11c having a shorter length (width) W11 in the left-right direction (width direction) than the other end portion 11eb. It has a shape. The constricted part 11c is a part sandwiched between the wearer's legs (hips) when the diaper 1 is worn, and the length of the part in the left-right direction is short (the width is narrow). The core 11 is easy to fit between the wearer's crotch.

  Moreover, the low basic weight area | region (not shown in FIG. 2) may be provided in the predetermined position of the absorptive core 11. FIG. The low basis weight region is a region where the basis weight (weight per unit area) of the absorbent core 11 is lower than its surroundings. Since the absorptive core 11 has low rigidity at a portion where such a low basis weight region is provided, the low basis weight region becomes a starting point of bending of the absorbent core 11 when the diaper 1 is worn. For example, when the low basic weight area is provided along the longitudinal direction of the absorbent core 11, the absorbent core 11 is easily bent and deformed along the unevenness of the wearer's body. Thereby, the absorptive main body 10 becomes easy to fit a wearer's body.

  The top sheet 12 is a liquid-permeable sheet member disposed on the skin side of the absorbent core 11 and is formed of a non-woven fabric having a larger planar size than the absorbent core 11 (for example, an air-through nonwoven fabric or a spunbond nonwoven fabric). The In the example of FIG. 3, the left and right ends of the top sheet 12 are arranged so as to be folded to the non-skin side of the absorbent core 11, and the top sheet 12 is configured to wrap the absorbent core 11 from the skin side. . However, the left and right ends of the top sheet 12 do not necessarily have to be folded into the non-skin side of the absorbent core 11.

  The exterior sheet portion 13 is a sheet member that is disposed on the non-skin side with respect to the absorbent core 11, and is a planar member that is larger in size than the absorbent core 11. The exterior sheet portion 13 includes, for example, a breathable film 13a that is a liquid-impermeable and breathable film such as polyethylene or polypropylene, and a backsheet 13b such as a nonwoven fabric that covers the breathable film 13a from the non-skin side. It is a sheet member having a two-layer structure.

  Side sheets 14 are provided at both ends in the left-right direction of the exterior sheet portion 13. In the left-right direction, the side sheet 14 extends to the outside of the exterior sheet portion 13 and is folded back inward with the predetermined positions 10es and 10es as the folding position, thereby forming the side flap SF of the diaper 1.

  As shown in FIG. 1, the side flap SF is provided so as to project outward in the left-right direction along the leg opening LH. In the present embodiment, a plurality of leg-hole elastic members 17, 17, such as rubber thread, are each extended in the vertical direction (longitudinal direction) between the side sheets 14, 14 folded in the thickness direction. And fixed in the left-right direction (width direction) with a predetermined interval (see FIGS. 2 and 3). Thereby, the elasticity along the up-down direction (longitudinal direction of the absorptive main body 10) is provided with respect to the side flap SF. That is, stretchability is imparted along the leg opening LH. Therefore, when the diaper 1 is worn, the side flap SF is easily fitted on the surface along the leg of the wearer, and it is easy to suppress excrement and the like from leaking from the leg opening LH.

  Moreover, the leak-proof wall part 50 is provided in the both sides of the left-right direction of the absorptive core 11. As shown in FIG. When the diaper 1 is worn, the leak-proof wall portion 50 stands on the skin side of the wearer from both the left and right sides of the absorbent core 11 so that excrement leaks to the outside of the absorbent main body 10 (lateral leakage). To suppress.

  The leak-proof wall part 50 of this embodiment has a leak-proof wall sheet 51 and a plurality of leak-proof wall elastic members 52. The leak-proof wall sheet 51 is a rectangular sheet member having flexibility, and is made of, for example, a nonwoven fabric or the like. And the leak-proof wall sheet | seat 51 is bend | folded toward the inner side of the left-right direction outside the outer end 11es of the absorptive core 11 in the left-right direction, and the edge part 50t of the one side bent | folded from the absorptive core 11 Also on the skin side, the bent end portion 50 b on the other side is arranged on the non-skin side with respect to the absorbent core 11.

  A plurality of leak-proof wall elastic members 52, 52... Extend in the up-down direction (longitudinal direction) at one end 50 t of the leak-proof wall sheet 51 disposed on the skin side of the absorbent core 11. Is provided. When the diaper 1 is worn, the end 50t of the leak-proof wall portion 50 stands on the skin side of the wearer based on the stretchability expressed by the leak-proof wall elastic member 52. On the other hand, the end 50b on the other side of the leak-proof wall sheet 51 disposed on the non-skin side with respect to the absorbent core 11 is joined and sandwiched between the absorbent core 11 and the exterior sheet portion 13. It is fixed and serves as an upright base when the leak-proof wall 50 stands up.

(Belt part 20, 30)
The front belt portion 20 and the rear belt portion 30 include inner layer sheets 21 and 31, outer layer sheets 22 and 32 laminated on the inner layer sheets 21 and 31, and a plurality of thread-like elastic members 23 and 33, respectively.

  The outer layer sheets 22 and 32 are arranged on the non-skin side with respect to the inner layer sheets 21 and 31. The inner layer sheets 21 and 31 and the outer layer sheets 22 and 32 are disposed on the non-skin side with respect to the absorbent main body 10. The inner layer sheets 21 and 31 and the outer layer sheets 22 and 32 alone are non-stretchable sheets that substantially do not have the left-right stretchability of the diaper 1. As the inner layer sheets 21 and 31, and the outer layer sheets 22 and 32, SMS nonwoven fabric (spunbond / meltblown / spunbond nonwoven fabric), spunbond nonwoven fabric, air-through nonwoven fabric, plastic sheet, perforated plastic sheet and laminate sheet thereof are used. Can do.

  The plurality of thread-like elastic members 23 and 33 are arranged side by side in the vertical direction between the inner layer sheets 21 and 31 and the outer layer sheets 22 and 32 and are fixed in a state of extending in the left-right direction. Therefore, the front belt part 20 and the rear belt part 30 expand and contract in the left-right direction, and fit around the wearer's waist. Examples of the thread-like elastic members 23 and 33 include thread-like elastic members such as rubber and spandex.

<About the temperature drop of the absorbent main body>
Next, the mechanism of the temperature fall of the absorptive main body produced at the time of diaper (absorbent article) wearing is demonstrated. FIG. 4 is a diagram for explaining the movement of heat generated in the absorbent main body 110 of the comparative example. In FIG. 4, as a comparative example, the state of heat transfer that occurs between the skin side and the non-skin side of the wearer of the conventional absorbent main body 110 is schematically shown.

  The absorbent main body 110 of the comparative example includes an absorbent core 111, a top sheet 112 disposed on the skin side of the absorbent core 111, and an exterior sheet portion 113 disposed on the non-skin side of the absorbent core 111. It has. The exterior sheet portion 113 has a two-layer structure in which a breathable film 113a and a back sheet 113b are laminated in the thickness direction. The basic functions and configurations of the respective parts of the absorbent main body 110 of the comparative example are substantially the same as those of the absorbent main body 10 of the present embodiment. For convenience of explanation, the leak-proof wall and side flaps are omitted in FIG.

  Moreover, in FIG. 4, the temperature of the skin side of the absorptive main body 110 shall be 38 degreeC supposing the temperature close | similar to a wearer's body temperature. On the other hand, the temperature on the non-skin side of the absorbent main body 110 is set to 15 ° C. assuming an outside air temperature in winter (specifically, a temperature in a space between clothes such as pants and the diaper 1). And in such temperature conditions, the movement of the heat which arises between the absorptive main body 110 and the skin side or the non-skin side is examined.

In this specification, “heat flow peak value Qmax (W / cm ² )” is used as an index representing the amount of heat transfer. The heat flow peak value Qmax (hereinafter, also simply referred to as “Qmax value”) stores a predetermined amount of heat on a heat plate having a constant area and a constant mass, and immediately after the heat is in contact with the sample surface, the stored heat amount is a low temperature sample. This represents the peak value of the heat flow rate when moving to. That is, the Qmax value is a value that simulates the amount of heat (such as body temperature) taken by the sample when wearing clothes, and the larger the Qmax value, the higher the body temperature taken when wearing and the higher the feeling of cool contact. That is, as the Qmax value increases, the amount of heat transfer increases, and the wearer can easily feel cold.

  Conventionally, in the absorbent main body 110 as in the comparative example, the top sheet 112 and the back sheet 113b are formed of an equivalent nonwoven fabric (for example, an air-through nonwoven fabric or a spunbonded nonwoven fabric), so both of them under the same temperature condition The Qmax values of are substantially the same. That is, the top sheet 112 and the back sheet 113b have equivalent heat transfer characteristics.

  The exterior sheet portion 113 of the absorbent main body 110 has a two-layer structure of a back sheet 113b and a breathable film 113a. However, the breathable film 113a has good breathability and has an effect on heat transfer. Is small. That is, it can be considered that the Qmax value of the exterior sheet portion 113 (the back sheet 113b and the breathable film 113a) and the Qmax value of the back sheet 113b alone are substantially equal. Therefore, in the absorbent main body 110 of the comparative example, the Qmax value (Qm112) of the top sheet 112 and the Qmax value (Qm113) of the exterior sheet portion 113 are substantially the same value (Qm112 = Qm113).

  In such an absorbent main body 110, immediately after the absorbent core 111 absorbs excrement such as urine, the temperature of the absorbent core 111 becomes a temperature (38 ° C.) close to the body temperature of the wearer. And when the water | moisture content (for example, urine) absorbed by the absorptive core 111 transpires to the exterior (skin side and non-skin side) as water vapor | steam, by evaporating heat, the absorptive core 111 of the absorptive core 111 is passed over time. The temperature gradually decreases. In particular, in the case of FIG. 4, since the outside air temperature (15 ° C.) on the non-skin side is low, heat exchange is likely to occur between the absorbent core 111 and the outside air via the exterior sheet portion 113, and the temperature of the absorbent core 111. Is prone to decline.

  As a result, the temperature of the absorptive core 111 after a long period of time decreases to around the outside air temperature (15 ° C.). Then, heat exchange occurs between the absorbent core 111 whose temperature has decreased and the skin of the wearer via the top sheet 112, and heat easily moves from the wearer's skin to the absorbent core 111 side.

  Thus, when a diaper is worn for a long time, heat may be taken from the wearer's body by the absorbent core 111, and the wearer's body may be cooled. In particular, when the outside temperature is low in winter and the diaper is worn for a long time without going out or sleeping, the wearer's body is easily cooled and uncomfortable.

<About the absorptive main body 10 of this embodiment>
In contrast, in the diaper 1 of the present embodiment, the Qmax value is appropriately adjusted between the top sheet 12 and the exterior sheet portion 13 of the absorbent main body 10, so that the diaper 1 can be kept for a long time under a low outside temperature. Even when worn, the wearer's body is not easily cooled. FIG. 5 is a diagram for explaining the movement of heat generated in the absorbent main body 10 of the present embodiment.

  In the absorbent main body 10 of the present embodiment, the topsheet is such that the Qmax value (Qm12) of the topsheet 12 under a certain temperature condition is smaller than the Qmax value (Qm13) of the exterior sheet portion 13 under the same temperature condition. 12 is configured (Qm13> Qm12). That is, the top sheet 12 has a configuration in which heat transfer in the thickness direction is less likely to occur as compared with the exterior sheet portion 13. In other words, the top sheet 12 has higher heat insulation performance than the exterior sheet portion 13. A specific configuration of the top sheet 12 will be described later.

  4, in the absorbent main body 10 of FIG. 5, immediately after the absorbent core 11 absorbs excrement such as urine, the temperature of the absorbent core 11 is the body temperature of the wearer. The temperature is close (38 ° C.). Then, moisture such as urine absorbed by the absorbent core 11 evaporates to the outside of the absorbent core 11 as water vapor. At this time, in the top sheet 12 of this embodiment, since heat insulation is high compared with the exterior sheet part 13, the evaporation from the absorbent core 11 to the skin side hardly occurs via the top sheet 12, and the exterior sheet part. 13 is likely to cause transpiration from the absorbent core 11 to the non-skin side.

  In this case, on the non-skin side of the absorbent main body 10, heat exchange is performed between the absorbent core 11 and the outside air, so that the temperature of the absorbent core 11 tends to decrease. On the other hand, on the skin side of the absorbent main body 10, it is difficult for heat exchange to be performed between the absorbent core 11 and the skin of the wearer, and even if the temperature of the absorbent core 11 is lowered, the influence of the temperature drop is affected by the wearer. It is hard to be transmitted to the skin. That is, it is difficult for the wearer to feel the coldness of the absorbent main body 10. Moreover, since the transpiration | evaporation of the water | moisture content from the absorptive core 11 to the non-skin side (outside air side) is not restrict | limited, at the time of the wearing of the diaper 1, it is suppressed that a water | moisture content gets muffled in the absorptive main body 10. . Thereby, the absorptive main body 10 which is hard to cool a wearer's body and hardly causes discomfort during wearing can be realized.

The Qmax value is measured as follows using a servo laboratory KES-F7 (manufactured by Kato Tech) . First, in a state where the sheet member to be measured (the top sheet 12 and the exterior sheet portion 13, hereinafter also referred to as “sample”) and the absorbent core 11 are overlapped, 300 ml of artificial urine is dropped and left for 30 minutes, The artificial urine is absorbed by the absorbent core 11. Then, the absorptive core 11 and a sample are cooled until it becomes 15 degrees C or less with an incubator. 15 degreeC is the temperature which assumed the external temperature of the diaper 1 in winter as mentioned above. And after warming the sensor part of Servo Lab KES-F7 to about 40 ° C. (assuming human skin is assumed to be 38 ° C.), the sample part and the absorbent core are placed on the sensor part so that the sample part and the sensor part come into contact with each other. 11 is put. Furthermore, a weight of 200 g is placed on the absorbent core 11 so that a pressure equivalent to the pressure applied by the baby's body weight (assuming body pressure: 0.35 g / mm ² ) is applied when the diaper 1 is worn. Under such load conditions, the Qmax value when the internal temperature of the absorbent core 11 reaches 15 ° C. is measured.

  FIG. 6 is a table summarizing the results of measuring Qmax values for a plurality of types of sheet members. In FIG. 6, in addition to the top sheet 12 and the exterior sheet portion 13 of the present embodiment, the results of measuring the Qmax value based on the measurement method described above for four types of sheet members (samples) are shown as comparative examples. ing. Also. In the table of FIG. 6, in addition to the Qmax value, the thickness, basis weight, surface shape, and cooling feeling evaluation of each sheet member (sample) are shown.

“Thickness (μm)” represents the average thickness of each sample. The thickness is measured using, for example, a dial thickness gauge ID-C1012C manufactured by Mitutoyo Corporation or equivalent, and the contact area is set to 20 cm ² and the contact pressure is set to ³ gf / cm ^2. You may pressurize and measure an object part, or you may compare by visual observation, or may compare using the picture which photoed the section which cut the sample in the longitudinal direction. And the average of the thickness measured about several places for every sample is computed. “Basis weight (g / m ² )” represents the weight per unit area of the sample. For example, each sample is cut into a predetermined shape and size, and the weight is measured by an electronic balance or the like. calculate. “Surface shape” indicates whether the surface of each sample has a planar shape or an uneven shape.

  The “cool feeling evaluation” represents an evaluation as to whether or not the user feels cold when touching the surface of the sample. Specifically, a test is performed in which a predetermined number of users (for example, 20 people) touch the surface of the sample (and the absorbent core) in a state in which artificial urine is absorbed, and a total of 8 users who have not felt cold. When it exceeded the percentage, the cold feeling evaluation was marked with ◯, and other cases were marked with ×. As described above, when the diaper 1 is worn, it is desirable that the top sheet 12 that is in direct contact with the skin of the wearer does not make the wearer feel cold. Therefore, if a sheet member having a cool feeling evaluation of ◯ is used as the top sheet 12, it is possible to make the wearer less likely to feel uncomfortable.

As shown in FIG. 6, the Qmax values of the top sheet 12 and the exterior sheet portion 13 in the diaper 1 of the present embodiment are Qm12 = 0.169 (W / cm ² ) and Qm13 = 0.31 (W / cm, respectively). ² ). That is, the Qmax value of the top sheet 12 is smaller than the Qmax value of the exterior sheet portion 13 (Qm12 <Qm13). Therefore, as described with reference to FIG. 5, heat transfer through the top sheet 12 is reduced between the absorbent core 11 and the wearer's skin, and even if the temperature of the absorbent core 11 is lowered, it is cooled. This makes it difficult for the wearer to feel it. On the other hand, heat transfer through the exterior sheet portion 13 increases between the absorbent core 11 and the outside air, and moisture such as urine absorbed by the absorbent core 11 is easily evaporated to the non-skin side (outside air). Thereby, the absorptive main body 10 becomes difficult to stuffy.

Furthermore, as shown in FIG. 6, since the cool feeling evaluation of the top sheet 12 is ◯, in the absorbent main body 10 of the present embodiment, the top sheet 12 itself has a configuration in which it is difficult for the wearer to feel cold. It has become. Note that the smaller the heat transfer amount of the sheet member, the harder it is to feel the coldness of the sheet member. Therefore, the lower the Qmax value of the sheet member, the higher the cool feeling evaluation should be. Referring to the Qmax value for each of the top sheet 12, the exterior sheet portion 13, and Comparative Examples 1 to 4 in FIG. 6, when the Qmax value is greater than 0.23 (W / cm ² ) (the exterior sheet portion 13, In Comparative Examples 2 and 3), the cool feeling evaluation is x. On the other hand, when the Qmax value is smaller than 0.21 (W / cm ² ) (top sheet 12 and Comparative Examples 1 and 4), the cool feeling evaluation is “good”. Therefore, the sheet member used as the top sheet 12 is desirably configured so that at least the Qmax value is 0.21 (W / cm ² ) or less.

  Next, the relationship between the configuration of the sheet member and the Qmax value will be described. It has been explained that the smaller the Qmax value is, the higher the heat insulating property of the sheet member is. However, as a factor that affects the heat insulating performance of the sheet member, a difference in the configuration of the sheet member can be considered. As an example of such a factor, the “thickness” of the sheet member is first mentioned. For example, when the sheet member is a non-woven fabric as in this embodiment, the heat insulation performance increases as the sheet member becomes thicker. In general, since a nonwoven fabric is formed by intertwining fibers, it has a structure having a large number of voids between the entangled fibers. Therefore, the thicker the non-woven fabric, the thicker the air layer formed by the voids inside the non-woven fabric, and the easier the movement of heat in the thickness direction becomes. That is, the thicker the nonwoven fabric, the higher the heat insulation performance and the smaller the Qmax value.

  Referring to Comparative Example 1 and Comparative Example 2 in FIG. 6, both have the same basis weight and surface shape. On the other hand, the thickness of Comparative Example 1 is 1125 μm, whereas the thickness of Comparative Example 2 is 675 μm, which is greatly different. In such a configuration, the Qmax value of Comparative Example 1 is 0.163, and the cool feeling evaluation is ◯. On the other hand, the Qmax value of Comparative Example 2 is 0.23, and the cool feeling evaluation is x. Therefore, it can be understood that the difference between the two Qmax values is greatly influenced by the “thickness” of the sheet member, and the Qmax value decreases as the thickness increases (thickness), and good thermal insulation performance is exhibited.

  Actually, in the diaper 1 of the present embodiment, the thickness of the top sheet 12 is 1350 μm, whereas the thickness of the exterior sheet portion 13 is 250 μm, and the top sheet 12 having a larger thickness has a Qmax value. It is getting smaller. Thus, in the diaper 1, the thickness of the top sheet 12 is desirably larger than the thickness of the exterior sheet portion 13. Thereby, the heat exchange amount between the absorptive core 11 and a wearer's body becomes small via the top sheet 12, and it becomes easy to implement | achieve the diaper 1 (absorbent main body 10) which is hard to cool a wearer's body.

  Moreover, the surface shape of a sheet member is mentioned as a factor which affects the heat insulation performance of a sheet member. For example, when the surface shape of the sheet member is a flat surface, the sheet member is likely to be in close contact with the wearer's body, and the contact area between the sheet member and the wearer's body is increased. In this case, heat easily moves between the seat member and the wearer's body, and the amount of heat exchange may increase. On the other hand, when the unevenness | corrugation of the thickness direction is formed in the surface of a sheet | seat member, compared with the case where the surface of a sheet | seat member is planar, a contact area with a wearer's body becomes small. That is, it becomes difficult for the sheet member to come into contact with the wearer's body in the concave portion among the concaves and convexes, and the surface of the sheet member becomes difficult to adhere to the wearer's body. Therefore, it becomes difficult for heat to move between the seat member and the wearer's body, and the amount of heat exchange can be reduced. Moreover, since a space (gap) is formed between the concave portion of the seat member and the wearer's body, movement of heat is easily suppressed by the space. Thus, by making the surface shape of the sheet member uneven, the Qmax value becomes small, and the heat insulation performance can be improved.

  Referring to Comparative Example 2 and Comparative Example 3 in FIG. 6, both have the same basis weight and a small difference in thickness. On the other hand, the surface shape of Comparative Example 3 is flat, while the surface shape of Comparative Example 2 is uneven. In such a configuration, the Qmax value of Comparative Example 2 is 0.23, whereas the Qmax value of Comparative Example 3 is 0.392, and the Qmax value is greatly increased. Therefore, it can be seen that the “surface shape” of the sheet member greatly affects the difference between the Qmax values of the two, and that the Qmax value is small as compared with the case where the surface is planar due to the unevenness on the surface.

  In this embodiment, the surface of the top sheet 12 is uneven, whereas the surface of the exterior sheet portion 13 is planar, and the top sheet 12 has a smaller Qmax value than the exterior sheet portion 13. It has become. Therefore, in the diaper 1, it is desirable that unevenness in the thickness direction is provided at least on the surface of the top sheet 12. Thereby, the heat exchange amount between the absorptive core 11 and the wearer's body becomes smaller via the top sheet 12, and it becomes easy to realize the diaper 1 (absorbent body 10) that is difficult to cool the wearer's body. .

  FIG. 7 is a schematic cross-sectional view illustrating the surface shape of the top sheet 12 of the present embodiment. As shown in FIG. 7, the surface of the top sheet 12 is provided with a plurality of convex portions 121 that protrude in one direction (skin side) in the thickness direction and are arranged in the left-right direction (width direction). . Moreover, the recessed part 122 is provided between the two convex parts 121 and 121 adjacent to the width direction, and the convex part 121 and the recessed part 122 are formed continuously along the longitudinal direction of the top sheet 12. Has been. That is, striped irregularities extending in the longitudinal direction are formed on the surface of the top sheet 12 by the convex portions 121 and the concave portions 122. Thereby, the contact area of the top sheet 12 and a wearer's body becomes small, and the heat insulation performance of the top sheet 12 improves.

  Moreover, each convex part 121 has a substantially parabolic shape as shown in FIG. 7, and the length in the left-right direction (width direction) increases toward one side (skin side) in the thickness direction. (Width) W121 is small. In other words, the width W121 on one side (skin side) in the thickness direction is smaller than the width W121 on the other side (non-skin side) in the thickness direction. Therefore, compared with the case where the width W121 is constant in the thickness direction (when the width is not narrowed), the contact area with the skin of the wearer becomes smaller, and the heat insulating performance of the top sheet 12 is improved. In addition, since the space S121 formed between the convex portions 121 and 121 adjacent to each other in the left-right direction becomes larger on the skin side in the thickness direction, the heat transfer is suppressed by the space S121, and a higher heat insulating effect. It becomes easy to demonstrate. Thereby, it can be made hard to feel cold by a wearer.

  In addition, in the top sheet 12 of this embodiment, the space | interval G121 of the left-right direction (width direction) of the convex parts 121 and 121 is 1.5 mm-2.0 mm. The height H121 of the convex portion 121 (the distance in the thickness direction between the apex of the convex portion 121 and the bottom point of the concave portion 122) is 0.8 mm to 1.2 mm. Thereby, sufficient heat insulation performance can be maintained. Further, the shape of the convex portion 121 is not limited to a substantially parabolic shape as shown in FIG. 7, and may be a semicircular shape, a cone shape, a trapezoid shape, or the like, and has a shape in which the width W121 becomes narrower toward the skin side in the thickness direction. If so, the effects as described above can be obtained.

Another factor that affects the heat insulation performance (Qmax value) of the sheet member is the basis weight of the sheet member. This is because the greater the basis weight of the sheet member, the greater the amount of fibers per unit area, which tends to hinder the movement of heat inside the sheet member. Therefore, the basis weight of the top sheet 12 is desirably larger than that of the exterior sheet portion 13. In the present embodiment, as shown in FIG. 6, the basis weight of the top sheet 12 is 30 (g / m ² ), whereas the basis weight of the exterior sheet portion 13 is 15 (g / m ² ). Yes, the top sheet 12 has a larger basis weight than the exterior sheet portion 13. Therefore, it can be made hard to feel cold by a wearer.

  Furthermore, in order to improve the heat insulation performance of the sheet member, it is preferable to increase the fiber diameter and increase the rigidity of the nonwoven fabric, thereby making it easier to suppress the nonwoven fabric from being crushed by external pressure or the like. Thereby, since the space | gap between fibers is hard to be crushed inside a nonwoven fabric and it becomes easy to maintain an air layer, the heat insulation performance of a sheet | seat member can be improved. Moreover, it is good also considering the fiber which comprises a nonwoven fabric as a hollow cylindrical fiber. In this case, since an air layer is formed inside the fiber, the heat insulating performance of the sheet member can be enhanced.

The top sheet 12 may have a structure in which a hydrophobic fiber layer and a hydrophilic fiber layer (for example, a cellulose fiber layer) are laminated. For example, cellulosic fibers are exposed while being unevenly distributed on one surface in the thickness direction of the top sheet 12, and hydrophobic fibers are unevenly distributed on the other surface. By doing in this way, among the surface on one side and the surface on the other side, the surface on the skin side (preferably the side opposite to the surface on which the cellulosic fibers are unevenly distributed) is in contact with the body fluid and is wet. Even when touching the skin of the wearer at the time, it is difficult to give the wearer a cold and dull unpleasant feeling.
This layer is referred to as a “hydrophobic fiber layer”.

  Moreover, in order to improve the heat insulation performance in the skin side of the absorptive main body 10, you may deform | transform the absorptive main body 10 as follows. FIG. 8 is a schematic cross-sectional view illustrating a modified example of the absorbent main body 10. In the absorbent main body 10 of the modified example, a second sheet 15 is provided between the top sheet 12 and the absorbent core 11 in the thickness direction. The second sheet 15 is a sheet member having liquid permeability and air permeability, and is formed of a nonwoven fabric such as an air-through nonwoven fabric. The configuration other than the second sheet 15 is the same as the configuration of the absorbent main body 10 described in FIG.

  As shown in FIG. 8, the second sheet 15 is laminated between the absorbent core 11 and the top sheet 12, whereby the movement of heat between the absorbent core 11 and the wearer's body is more easily suppressed. . That is, the heat insulation performance of the sheet member on the skin side of the absorbent core 11 can be further enhanced. Thereby, at the time of wearing of the diaper 1, it can be made hard to feel cold by a wearer.

  In the absorbent main body 10 of the present embodiment, the top sheet 12 and the exterior sheet portion extend from one end (front side) end 11ef of the absorbent core 11 to the other end (rear side) end 11eb in the longitudinal direction. 13 is provided. In other words, the top sheet 12, the absorbent core 11, and the exterior sheet portion 13 are laminated in the thickness direction in all regions in the longitudinal direction of the absorbent core 11. Thereby, it is possible to make it difficult for the wearer to feel cold in the entire longitudinal direction of the absorbent core 11.

  However, the absorbent main body 10 is not necessarily required to have the above-described configuration in the entire area in the longitudinal direction of the absorbent core 11, and each member is laminated in the thickness direction in a part of the longitudinal direction. It may be in the state. In that case, it is desirable that the top sheet 12, the absorbent core 11, and the exterior sheet portion 13 are laminated in the thickness direction at least in the crotch part of the wearer. Since the crotch is a part where the excretion opening such as the vagina of the wearer is located, it is possible to make the wearer less likely to feel discomfort by not cooling the wearer's body in the crotch. In addition, the crotch part of the absorbent main body 10 is a region having a predetermined width in the longitudinal direction of the absorbent core 11 from the center position CL to the front and rear, and in the longitudinal direction of FIG. This is an area overlapping with the formed area.

  Further, in the absorbent main body 10, the area of the portion where the top sheet 12, the absorbent core 11 and the exterior sheet portion 13 are laminated in the thickness direction is behind the central position CL in the longitudinal direction of the absorbent core 11. Is preferably larger than the front side of the center position CL. The region behind the center position CL is a region that comes into contact with the wearer's buttocks when the diaper 1 is worn. Therefore, it is possible to make it difficult to feel coldness in a wide range of the wearer's body by laminating each part in the heel part having a large surface area. Moreover, the area | region of the buttocks side is also an area | region where a body weight is applied when the wearer sits down with the diaper 1 worn, and the absorbent main body 10 is easily pressed against the worn body. Therefore, it is difficult to make the wearer feel uncomfortable by making it difficult to feel cold in the region.

<About the structure of the absorptive core 11>
In order to prevent the wearer from feeling the coldness of the absorbent main body 10 when the diaper 1 is worn, the method for reducing the Qmax of the top sheet 12 has been described. However, the absorbent core 11 can also be configured as follows. It is possible to make it difficult to feel the coldness of the absorbent main body 10.

  As described above, the absorbent core 11 of the present embodiment has the constricted portion 11c in which the length (width) W11 in the left-right direction (width direction) is narrowed (see FIG. 2). By having the constricted portion 11c having a narrow width in this way, the absorbent core 11 is less likely to hinder the movement of the wearer's leg in the wearer's crotch, and fits between the wearer's groin. It becomes easy. Furthermore, compared with the case where the width | variety of the absorptive core 11 is constant (namely, when the absorptive core 11 is rectangular shape), the surface area of the absorptive core 11 becomes small by having the constriction part 11c. Therefore, when the diaper 1 is worn, the contact area between the wearer's body and the absorbent core 11 (absorbent body 10) is reduced, and heat transfer between the absorbent core 11 and the wearer's skin is reduced. be able to. Thereby, it can be made hard to make a wearer feel the coldness of the absorptive main body 10.

  Moreover, the process (for example, embossing) which squeezes the predetermined area | region of the absorptive core 11 to thickness direction is performed, and the density part (not shown) in which the density of the absorptive core 11 became higher than the density of the circumference | surroundings You may make it provide. Since the absorptive core 11 is squeezed in the thickness direction in the region where the high density portion is provided, it is difficult to contact the wearer's body. That is, the absorbent core 11 has a smaller contact area with the wearer's skin compared to the case where the high density portion is not provided. Therefore, similarly to the above-described case, heat transfer between the wearer's body and the absorbent core 11 is reduced, and the wearer can hardly feel the coldness of the absorbent main body 10. In addition, if a plurality of such high-density portions are provided over the entire absorbent core 11, liquid absorbent fibers such as pulp are difficult to be separated, and the shape of the absorbent core 11 is stably maintained. It becomes easy. Therefore, the absorption performance by the absorbent main body 10 can be improved.

  Moreover, in the absorptive core 11, the low basic weight area | region where the basic weight (weight per unit area) became lower than the surrounding basic weight may be provided. The part in which such a low basic weight area | region is formed is hard to press the absorptive core 11 against a wearer's body at the time of wearing of the diaper 1 compared with another part. That is, when the diaper 1 is worn, the contact area between the absorbent core 11 and the wearer's body is reduced. Therefore, heat transfer is reduced between the wearer's body and the absorbent core 11, and the wearer can hardly feel the coldness of the absorbent main body 10.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof.

  In the above-described embodiment, as an example of the absorbent article, the front belt portion 20 and the rear belt portion 30 are separated and illustrated as diapers that are separate members, but the front belt portion 20 and the rear belt portion 30 are not separated. It may be a diaper provided with a crotch portion and formed of a single member in which the front belt portion 20 and the rear belt portion 30 are continuous.

1 diapers (pants-type absorbent articles),
2 side joint area,
10 Absorbent body, 10es in place,
11 Absorbent core,
11es end (outside end), 11ef end (abdominal side), 11eb end (back side),
11a core wrap sheet, 11c constriction,
12 Top sheet,
121 convex part, 122 concave part,
13 exterior sheet,
13a tempered film, 13b backsheet,
14 Side seat,
15 second seat,
17 leg elastic member,
20 Front belt part (ventral side waist part),
21 inner layer sheet, 22 outer layer sheet, 23 thread-like elastic member,
30 Rear belt (back waist),
31 inner layer sheet, 32 outer layer sheet, 33 thread-like elastic member,
50 leak-proof wall, 50t end, 50b end,
51 leak-proof wall sheet, 52 leak-proof wall elastic member,
110 Absorbent body (comparative example),
111 absorbent core,
112 top sheet,
113 exterior sheet part, 113a temper film, 113b back sheet,
BH waistline opening,
LH leg opening,
FL predetermined position, CL center position (absorbent core),
SF side flap

Claims (11)

Having a vertical direction and a horizontal direction intersecting each other,
An absorbent article having an absorbent body,
The absorbent body is
A liquid-absorbent absorbent core,
An exterior sheet portion disposed on the non-skin side of the absorbent core, comprising a breathable film and a back sheet, and having a predetermined heat flow peak value Qmax;
A top sheet that is disposed on the skin side of the absorbent core and configured to have a heat flow peak value Qmax lower than the predetermined heat flow peak value Qmax;
An absorbent article characterized by comprising: The absorbent article according to claim 1,
The absorbent article is characterized in that the top sheet, the absorbent core, and the exterior sheet portion are laminated in the thickness direction at least in the crotch portion of the wearer. The absorbent article according to claim 2,
On the rear side of the center in the longitudinal direction of the absorbent core, the area of the portion where the top sheet, the absorbent core, and the exterior sheet portion are laminated in the thickness direction is:
In the front side of the longitudinal center of the absorbent core, the top sheet, the absorbent core, and the exterior sheet portion are larger than the area of the portion laminated in the thickness direction, Absorbent article. It is an absorptive article given in any 1 paragraph of Claims 1-3,
An absorbent article, wherein the top sheet is a nonwoven fabric. It is an absorptive article given in any 1 paragraph of Claims 1-4,
The thickness of the said top sheet is larger than the thickness of the said exterior sheet | seat part, The absorbent article characterized by the above-mentioned. It is an absorptive article given in any 1 paragraph of Claims 1-5,
The said top sheet has the convex part protruded to the one side of the thickness direction, and the recessed part provided between the two said convex parts adjacent in the left-right direction, The absorptivity characterized by the above-mentioned. Goods. The absorbent article according to claim 6,
The said convex part is the absorbent article characterized by the width | variety of the said left-right direction becoming narrow as the skin side of the thickness direction. It is an absorptive article given in any 1 paragraph of Claims 1-7,
An absorbent article, wherein a second sheet is provided between the top sheet and the absorbent core. It is an absorptive article given in any 1 paragraph of Claims 1-8,
The absorbent core has a constricted portion with a narrow width in the left-right direction between one end portion in the longitudinal direction and the other end portion in the stretched state. Goods. It is an absorptive article given in any 1 paragraph of Claims 1-9,
The absorbent article is characterized in that the absorbent core has a high-density portion in which the density of the absorbent core is higher than the density of the surrounding area. It is an absorptive article given in any 1 paragraph of Claims 1-10,
The said absorbent core has a low basic weight area | region where the basic weight of the said absorbent core is lower than the surrounding basic weight, The absorbent article characterized by the above-mentioned.

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