JP4624247B2 - Body fluid absorbent sheet - Google Patents

Description

  The present invention relates to a body fluid-absorbing sheet, and more particularly to a sweat removing sheet for absorbing sweat on the side portions and the like.

  Since a person's side is easy to sweat, sweat may cause uncomfortable feelings and sweat spots may occur on the side of clothes. Therefore, in order to alleviate discomfort and prevent sweat spotting, a sweat-removing sheet that absorbs sweat by covering the entire side with the outerwear covered is known by sticking it to the inner side of the outer side of the outerwear. (For example, Patent Document 1).

In addition, as a technology for suppressing the discomfort caused by the body fluid reversing from the body fluid absorbent sheet and the absorption rate being slow and the body fluid remaining on the skin, a body fluid permeable sheet having a higher density than the surface sheet is provided between the surface sheet and the absorbent sheet. Technologies that increase the absorption speed by providing them (for example, Patent Documents 2 and 3), and technologies that make the surface material a two-layer structure and increase the density of the back layer rather than the surface layer to make it easier to absorb bodily fluids by capillary action. Known (for example, Patent Document 4).
JP 2004-52121 A JP 2003-210523 A JP 2004-201939 A JP-A-1-20844

  However, in the conventional body fluid-absorbing sheet, when applied to a highly fitting garment that adheres to the skin when worn, such as a T-shirt, the body fluid-absorbing sheet is compressed between the garment and the skin, thereby reversing the body fluid. There was a problem that was likely to occur. In addition, the body fluid absorption speed is not satisfactory, and the contact time between the body fluid and the skin becomes long, and the user may feel uncomfortable due to, for example, stickiness.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a bodily fluid-absorbing sheet capable of obtaining a comfortable feeling of use by quickly absorbing bodily fluids and reducing reversal. .

  The object of the present invention is a bodily fluid absorbent sheet comprising an absorbing layer that absorbs bodily fluid, the absorbing layer comprising a low porosity layer having a porosity of 5% or less and a non-skin contact of the low porosity layer. It consists of a high porosity layer having a porosity of more than 5% located on the surface side, and the high porosity layer is achieved by a body fluid absorbent sheet including a layer having a porosity of 15 to 40%.

  In the absorption layer, it is preferable that the low porosity layer and the high porosity layer are integrally formed without an adhesive layer.

  Moreover, it is preferable that the said absorption layer consists of a nonwoven fabric.

  The absorbent layer preferably contains 30% or more of water-absorbing fibers by weight.

Each of the body fluid absorbent sheets includes a surface layer laminated on at least a part of the absorption layer on the skin contact surface side of the low porosity layer, and a total basis weight of the absorption layer and the surface layer is 120 g / m ² or more is preferable.

  Furthermore, this invention relates to the sheet | seat for sweat removal which consists of said body fluid absorptive sheet, and the sheet | seat for sweat removal of a side part.

  According to the bodily fluid absorbent sheet of the present invention, a comfortable feeling of use can be obtained by quickly absorbing bodily fluids and reducing the reversal of the absorbed bodily fluids.

  Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a bodily fluid absorbent sheet 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

  As shown in FIGS. 1 and 2, the body fluid absorbent sheet 1 includes an absorbent layer 3 having water absorption, and is divided into two regions by a boundary line 15. The absorbent layer 3 is sandwiched between the front surface layer 10 and the back surface layer 11, and the back surface layer 11 is provided with an adhesive layer 12 covered with release paper (not shown). Further, the absorption layer 3 has a low porosity layer 5 located on the surface layer 10 side and a higher porosity than the low porosity layer 5, and is continuously located on the non-skin contact surface side of the low porosity layer 5. The high porosity layer 7 is provided, and the low porosity layer 5 and the high porosity layer 7 are integrally formed without an adhesive layer.

  In this embodiment, the porosity is calculated by the following operation.

  The body fluid absorbent sheet 1 cut into a strip having a width of 0.1 cm is placed on a black table so that the cross section faces upward, and a cross-sectional image is taken from above at a magnification of 50 times. The captured cross-sectional image is binarized using image processing software (for example, Photoshop manufactured by Adobe Systems) so that the void portion becomes a black pixel and the fiber portion becomes a white pixel on the computer screen. Thereafter, the total number of pixels G (pixels) and the number of black pixels F (pixels) in each region are measured, and the void ratio is obtained from the number of pixels by the following equation.

Porosity (%) = F / G × 100
Here, in the present invention, the taken cross-sectional image is equally divided into 10 in the thickness direction, and for each equally divided region, as described above, the void ratio is obtained from the number of pixels, and based on the void ratio of each region, A region having a porosity of 5% or less is defined as a “low porosity layer”, and a region having a porosity greater than 5% is defined as a “high porosity layer”.

  The absorbent layer 3 is not particularly limited as long as it has water-absorbing properties, and is generally used for sanitary napkins, diapers, sweat-removing sheets, and cage sheets, for example, well-known water-absorbing pulps and water-absorbing polymers. An absorbent material, a fiber structure composed of a woven fabric, a knitted fabric, a nonwoven fabric, a pulp product, or the like can be used. Of these, an aggregate (for example, non-woven fabric) is preferred because it is easy to adjust the voids in the absorbent layer within a specified range, and excellent absorbency and anti-reverse properties are easily exhibited. In particular, an aggregate composed of natural fibers and synthetic fibers. It is preferable to use (for example, a nonwoven fabric). Examples of natural fibers include cotton, silk, pulp, wool and hemp. Examples of the synthetic fiber include nylon fiber, polyethylene fiber, polyester fiber, polyamide fiber, acrylic fiber, polyvinyl alcohol fiber, polypropylene fiber, polyethylene terephthalate fiber, ethylene vinyl acetate fiber, urethane fiber, and acrylic fiber. Moreover, semi-synthetic fibers such as rayon fiber, acetate fiber, and cupra, and blended and mixed products of various fibers can also be used. Among these, synthetic fibers such as ethylene vinyl acetate fiber, polypropylene fiber, polyethylene fiber, polyester fiber, and polyethylene terephthalate fiber, or composite fibers thereof are easy to adjust the voids in the absorbent layer to a specified range and are excellent in maintaining the voids. Is preferred. Examples of the composite fiber include polyethylene / polyester (including polyethylene terephthalate) composite fiber, polyethylene / polypropylene composite fiber, ethylene vinyl acetate / polypropylene composite fiber, etc., and polyethylene / polypropylene from the viewpoint of excellent elastic recovery function (rebound). More preferred are composite fibers and polyethylene / polyester (including polyethylene terephthalate) composite fibers. Furthermore, when polyethylene / polypropylene composite fiber and polyethylene / polyester (including polyethylene terephthalate) composite fiber are used, the outer periphery of the core made of polypropylene fiber or polyethylene / polyester (including polyethylene terephthalate) composite fiber is encapsulated with polyethylene, A core polypropylene fiber polyester (including polyethylene terephthalate) fiber is more preferable in that it can exhibit an excellent elastic return function (rebound) when used.

  In addition, the absorbent layer 3 is preferably blended with water-absorbing fibers from the viewpoint of excellent body fluid absorbability and anti-reverse property. As the water-absorbing fiber, cellulose-based fibers such as cotton and pulp, water-absorbing chemical fibers such as rayon and acetate, and the like can be used. Among these, cellulose-based fibers are preferable from the viewpoint of excellent body fluid absorbability.

  In the absorbent layer 3 of the present embodiment, if the amount of the water-absorbing fibers to be blended is too small, the amount of water retained by the water-absorbing fibers decreases, and the absorbed body fluid remains in the gap without being absorbed by the water-absorbing fibers. Therefore, when the absorption layer 3 is compressed, the body fluid easily returns. Therefore, the absorbent layer 3 preferably contains 30% or more by weight of water-absorbing fibers, more preferably 40% or more. Moreover, 80% or less is preferable and 70% or less is more preferable by weight ratio from the point which can obtain the resistance with respect to a twist or a bend, and the touch is excellent in a feeling of use as a fluffy.

  Non-woven fabric as an absorbent layer is a wet papermaking method, dry papermaking method, spunbond method, melt blow method, latex resin bond method, solvent bond method, stitch bond method, needle punch method, spunlace method, thermal bond method, air through method It can be produced by a method such as an airlaid method. Of these, the spunlace method, thermal bond method, air-through method, air laid method, needle punch method, spun bond method and the like are preferable. In these methods, the low porosity layer 3 and the high porosity layer 3 are used without using an adhesive or a solvent. The porosity layer 5 can be integrally formed without an adhesive layer, thereby improving the absorbability and the anti-reverse property.

  In the present specification, “the low porosity layer 3 and the high porosity layer 5 are integrally formed without an adhesive layer” means that the low porosity layer 3 and the high porosity layer 5 are bonded. In a state where no layer is interposed (the interface is unclear), for example, the high porosity layer 5 is continuously located on the non-skin contact surface side of the low porosity layer 3 and is formed as a single layer as a whole. Say.

  In the absorption layer 3 of the present embodiment, if the porosity in the high porosity layer 7 is too small, there are few voids for holding body fluid, so the absorption rate of body fluid is slowed down, and the body fluid remains on the skin for a long time, When the absorbing layer 3 is compressed, the body fluid absorbed in the high porosity layer 7 does not diffuse in the high porosity layer 7 and easily returns from the low porosity layer 5 to the skin. On the other hand, if the porosity is too large, the difference in porosity between the high porosity layer 7 and the low porosity layer 5 is large, so that the body fluid in the low porosity layer 5 is smoothly transferred to the high porosity layer 7. It is difficult (the sweat absorption rate becomes slow) and stays in the low porosity layer 5, so that when the absorption layer 3 is compressed, the body fluid is likely to return. Therefore, the porosity of the high porosity layer 7 is preferably 15% to 40%, and more preferably 20 to 30%. For the same reason, the porosity difference between the low porosity layer 5 and the high porosity layer 7 is preferably 10 to 35%, more preferably 15 to 20%. The absorption layer 3 has a porosity of 5% between the low porosity layer 5 and the high porosity layer 7 having a porosity of 15 to 40%, or on the non-skin contact surface side of the high porosity layer 7. A high porosity layer that is larger than 15% may be provided.

  Moreover, in the bodily fluid absorption sheet 1 of this embodiment, 10-30% is preferable and, as for the average porosity of the absorption layer 3 whole, 10-20% is more preferable.

The absorbent layer 3 comprises a non-woven fabric having a porosity of 5% or less (low porosity layer) and a non-woven fabric having a porosity of 15 to 40% (high porosity layer), a heat-fusible powder (for example, polyethylene powder) ), Water-soluble adhesives (for example, acrylic water-soluble adhesives), water-insoluble adhesives (for example, rubber-based hot melts, olefin-based hot melts), and the like. However, according to the airlaid method, for example, the absorption layer 3 in which the low porosity layer 5 and the high porosity layer 7 are integrally formed without interposing the contact surface can be obtained. When the absorbent layer 3 is manufactured by the airlaid method, the synthetic fiber and the natural fiber are transported in the duct while being uniformly mixed by an air flow, and directed to the conveyor from the discharge port of the duct having a screen having pores. Then, the air is sucked from below the conveyor and deposited on the conveyor. Thereafter, the deposited fiber web is heat-treated with a hot air dryer or the like, and further pressurized with a press machine or the like. At this time, by appropriately setting the thickness of the fibers used for the nonwoven fabric, the temperature in the heat treatment, and the pressure in the pressure treatment, along the thickness direction of the absorbent layer 3 (from the skin contact surface to the non-skin contact surface). The porosity can be changed from dense to sparse. That is, the high porosity layer 7 can be continuously formed on the non-skin contact surface side of the low porosity layer 5 in a state (integral) without the contact surface (the interface is unclear). The temperature in the heat treatment is 10 to 50 ° C. higher than the softening point of the synthetic fiber, preferably 20 to 40 ° C. (for example, 120 to 160 when polyethylene / polypropylene composite fiber is used as the synthetic fiber). ° C is preferred, and 130 to 150 ° C is more preferred. Moreover, 0-50 kg / cm < ² > is preferable and the pressure in a pressurization process has more preferable 20-40 kg / cm < ² >. Furthermore, the thickness of the synthetic fiber is preferably 1.0 to 5.0 dtex, and more preferably 2.0 to 3.5 dtex. If the thickness of the synthetic fiber is less than 1.0 dtex, the porosity of the resulting absorbent layer 3 tends to be too small. Moreover, when 5.0 decitex is exceeded, there exists a tendency for the porosity of the absorption layer 3 to become high too much. In order to set the porosity of the high porosity layer 7 in the absorbent layer 3 in the range of 15 to 40%, the thickness of the fiber is more preferably 2.0 to 3.5 dtex. By defining the temperature, pressure and fiber thickness within these ranges, the synthetic fibers are appropriately melted and entangled with natural fibers, and the low porosity layer 5 and the high porosity layer 7 having a porosity of 15 to 40%. Can be formed as a single absorption layer 3 integrally formed without a contact surface. Furthermore, it can be set as the absorption layer 3 which becomes a soft texture (feel) and does not drop off natural fibers.

  The thicknesses of the low porosity layer 5 and the high porosity layer 7 in the absorption layer 3 are not particularly limited. For example, when used as a sheet for sweat removal, the low porosity layer 5 was absorbed when the thickness was too thick. Body fluid is not easily transferred to the high porosity layer 7, and the liquid absorption rate tends to be slow. If the thickness of the low porosity layer 5 is too thin, the body fluid from the high porosity layer 7 tends to revert. is there. Therefore, the thickness of the low porosity layer 5 is preferably 15 to 60% and more preferably 20 to 50% with respect to the thickness of the absorption layer 3. Specifically, 120 to 3000 μm is preferable, and 200 to 2500 μm is more preferable. Further, the thickness of the high porosity layer 7 is preferably 40 to 85% and more preferably 50 to 80% with respect to the thickness of the absorption layer 3. Specifically, 320-4250 micrometers is preferable and 350-4000 micrometers is more preferable.

  The surface layer 10 is laminated on at least a part of the skin contact surface of the low-porosity layer 5 in the absorbent layer 3, plays a role in improving absorbability and anti-reverse property, makes soft contact with the skin, and is flexible It serves to protect the absorbent layer 3. Examples of such a surface layer 10 include a sheet-like or film-like fiber structure composed of a woven fabric, a knitted fabric, a nonwoven fabric, a pulp product, or the like. Among these, non-woven fabrics are preferable from the viewpoints of improvement in absorbability and anti-reverse property, texture (texture), and irritation to the skin. Examples of fibers constituting such a fiber structure include natural fibers and synthetic fibers, and these can be used alone or in combination as a fiber structure having desired properties. Examples of the natural fiber and the synthetic fiber include the same fibers as those used as the raw material for the absorption layer 3. Although the shape of these fiber structures is not particularly limited, the liquid permeability is improved and the body fluid can surely reach the absorption layer 3 by making the mesh structure and / or the embossed pattern. At the same time, the area of contact with the skin is reduced, and this is preferable from the viewpoint that the feeling of adhesion when worn is reduced. In addition, it is preferable to perform embossing so that the hollow end part of the recessed part of the processed surface layer 10 may open. Furthermore, the fiber structure of the surface layer 10 is preferably subjected to water repellent treatment by means known to those skilled in the art.

  The method for bonding the surface layer 10 and the absorption layer 3 is not particularly limited, but heat-fusible powder (for example, polyethylene powder), water-soluble adhesive (for example, acrylic water-soluble adhesive), water-insoluble adhesive It can adhere | attach with adhesive agents, such as an agent (For example, a rubber-type hot melt, an olefin type hot melt).

In the absorption layer 3 and the surface layer 10 of the present embodiment, if the total basis weight of both is too small, sufficient water absorption cannot be obtained, so that the absorption rate is slowed and the absorbed body fluid is easily returned. Therefore, the total basis weight of the absorption layer 3 and the surface layer 10 is preferably 120 g / m ² or more, and more preferably 130 g / m ² or more. This total basis weight can be obtained by dividing the weight (g) of the absorbent layer 3 and the surface layer 10 by the area (m ² ) of the body fluid absorbent sheet 1. Further, the basis weight of the absorption layer 3 is preferably 90 g / m ² or more.

  The back surface layer 11 prevents the body fluid absorbed by the absorption layer 3 from flowing out. Polyethylene is preferably used as the material for the back layer 11, but an appropriate material such as polyester, polyvinyl alcohol, polypropylene, nylon, cellophane, vinylon, vinyl chloride or the like can also be used as necessary.

  The pressure-sensitive adhesive layer 12 is not particularly limited as long as it can be applied to clothes or the like. For example, a water-soluble adhesive (for example, an acrylic water-soluble adhesive) or a water-insoluble adhesive (for example, a rubber-based hot melt, And an adhesive such as an olefinic hot melt). Of these, a water-insoluble adhesive is preferable, and a rubber-based hot melt is more preferable in terms of superior adhesive strength to clothes compared to other adhesives.

  Although the thickness of the bodily fluid absorptive sheet | seat 1 is not specifically limited, For example, when using as a sheet | seat for sweat removal, 0.8-5.0 mm is preferable and 1.0-3.5 mm is more preferable.

  When the body fluid absorbent sheet 1 having the above configuration is used as a sweat removing sheet, the release paper (not shown) covering the adhesive layer 12 is peeled off, and the adhesive layer 12 is applied to the side portion of the clothes while being bent at the boundary line 15. By sticking on the inner surface, it is preferable that the surface layer 10 is in contact with the skin so as to cover the entire side while wearing clothes, and the absorbent layer 3 absorbs sweat. The body fluid absorbed by the absorption layer 3 is first absorbed by the low porosity layer 5, and after the voids and water-absorbing fibers of the low porosity layer 5 are saturated with the body fluid, the body fluid is transferred to the high porosity layer 7.

  According to the bodily fluid absorbent sheet 1 of the present embodiment, the absorbent layer 3 has a low porosity layer 5 and a porosity of 15 to 40% that is continuously located on the non-skin contact surface side of the low porosity layer 5. Since the high porosity layer 7 is provided, the following effects are produced. That is, since the body fluid can be transferred to the high porosity layer 7 having a higher porosity than the low porosity layer 5 after the low porosity layer 5 has absorbed the body fluid, the absorption layer 3 is only the low porosity layer 5. The absorption speed is faster than the case of consisting of, and body fluid can be absorbed quickly. Moreover, since the absorptive fiber in the low porosity layer 5 is saturated with the body fluid (there is no space in which the body fluid can move), even when the absorption layer 3 is compressed, the saturated low porosity layer When 5 becomes a wall, the backflow of the body fluid of the high porosity layer 7 to the low porosity layer 5 can be prevented, and the body fluid can be diffused into the high porosity layer 7. Thereby, the return of body fluid can be reduced. Therefore, even when applied to clothes with high fit, a comfortable feeling of use can be obtained without stickiness.

  In the present invention, if the body fluid absorbent sheet 1 is composed of the absorbent layer 3 in which the high porosity layer 7 is continuously located on the non-skin contact surface side of the low porosity layer 5, the body fluid is removed from the low porosity layer. 5 can be smoothly transferred to the high porosity layer 7 and can be prevented from reversing when compressed, but the absorbent layer 3 has a low porosity as in the body fluid absorbent sheet 1 of the present embodiment. When the layer 5 and the high porosity layer 7 are integrally formed without interposing the contact surface, the body fluid can be smoothly transferred from the low porosity layer 5 to the high porosity layer 7 and returned. It can be set as the bodily fluid absorption sheet excellent also in prevention property.

Further, when the body fluid absorbent sheet 1 of the present embodiment is used as a side sweat removing sheet, from the viewpoint of sufficiently absorbing sweat when worn on the side of clothes and preventing sweat spots on clothes. The plane area X (cm ² ) of the absorption layer 3 and the amount of absorption Y (mg / cm ² ) per unit area of the absorption layer 3 preferably have the following relationship.

Y ≧ −0.6X + 210 (2)
Further, from the viewpoint of sufficiently absorbing sweat to prevent reversal and preventing a feeling of stickiness and unpleasant contact thermal sensation when sweat reverses, the plane area of the absorbent layer 3 is preferably 50 to 150 cm ² , 70 ˜120 cm ² is more preferred.

  Further, in the bodily fluid absorbent sheet 1 of the present embodiment, there is no sense of incongruity at the start of use, and even a small amount of sweat does not cause a sense of incongruity due to sag, while a user feels a sense of discomfort due to sag when absorbing a large amount of sweat It is preferable to satisfy the following conditions A to D from the viewpoint of determining an appropriate replacement time and reducing the risk of sweat sweat.

  When the initial thickness (T0) is too thick, the body fluid absorbent sheet 1 of the present embodiment makes the user feel uncomfortable due to the stiffness. It tends to be difficult to use for a long time. Therefore, (Condition A) The initial thickness of the body fluid absorbent sheet 1 is preferably 1 to 5 mm. Here, “initial thickness” refers to the thickness of the body fluid absorbent sheet 1 before water absorption.

Moreover, since the followability with respect to compression is low when the initial thickness difference ((delta) T0) is too small, the bodily fluid absorptive sheet | seat 1 of this embodiment tends to be inferior to wearing property. Therefore, (Condition B) The initial thickness difference of the body fluid absorbent sheet 1 is preferably 1.0 mm or more. Here, the “initial thickness difference” is the thickness (T ₅ ) of the body fluid absorbent sheet 1 when pressurized at 5 g / cm ² in the body fluid absorbent sheet 1 before water absorption, and the pressure is 50 g / cm ^2. It refers to differences in body fluid absorbent sheet 1 in the thickness when used as a (T _50).

Moreover, in the bodily fluid absorbent sheet 1 of the present embodiment, if the first RC value (ΔRC _0.1 ) is too small, the bodily fluid absorbent sheet 1 sweats due to a sense of incongruity caused by a difference from the initial texture. Despite having sufficient ability to absorb, there is a tendency to replace the body fluid-absorbing sheet 1, which imposes a burden on the user and an economic burden. Therefore, (Condition C) The first RC value of the body fluid absorbent sheet 1 is preferably 50% or more. Here, the “first RC value” is the RC value of the bodily fluid absorbent sheet 1 that has absorbed 0.1 ml of water in the bodily fluid absorbent sheet 1 cut to 4.0 cm × 4.0 cm. The value divided by the RC value of the body fluid absorbent sheet 1.

Further, in the body fluid absorbent sheet 1 of the present embodiment, if the second RC value (ΔRC _0.5 ) is too large, the user is less likely to feel discomfort due to the absorption of sweat, and the body fluid absorbent sheet 1 is saturated with sweat. However, it becomes difficult to discriminate the replacement timing, and the backflow of saturated sweat increases. As a result, sweat spots tend to occur. Therefore, (Condition D) The second RC value of the body fluid absorbent sheet 1 is preferably 50% or less. Here, the “second RC value” is the RC value of the bodily fluid absorbent sheet 1 that has absorbed 0.5 ml of water in the bodily fluid absorbent sheet 1 cut to 4.0 cm × 4.0 cm. The value divided by the RC value of the body fluid absorbent sheet 1.

The RC value is compression recovery (%) determined by a KES compression tester (Kato Tech Co., Ltd., Handy compression tester KES-G5). The test conditions at this time are as follows.
・ Sample: cloth, film, etc. ・ SENS: 5
・ STROKE SET: 2.0
・ Upper load: 50 gf / cm ²
・ Repetition count: 1
・ Type of force meter: 1kg
・ SPEED RANGE: 0.1cm / sec
・ SPEED SET: 1
・ DEF sensitivity: 20mm / V
・ Capture interval: 0.1 sec
・ CONTROL: FORCE
According to the above test conditions, “first RC value” and “second” when distilled water is absorbed from the center of the body fluid absorbent sheet 1 cut to 4.0 cm × 4.0 cm and left for 1 minute. RC value "was measured.

Moreover, in the bodily fluid-absorbent sheet 1 cut into 4.0 cm × 4.0 cm, the thickness (T ₅ ) of the bodily fluid-absorbent sheet 1 when pressed with 5 g / cm ² with the skin contact surface side facing up, The thickness (T ₅₀ ) of the body fluid-absorbing sheet 1 when pressed at 50 g / cm ² was measured.

  In addition, if the overall average porosity of the absorbent layer 3 is too low, even if a large amount of sweat is absorbed, no settling occurs, and the user cannot be notified of an appropriate replacement time, resulting in sweat spots. In addition, if the overall average porosity is too high, even a small amount of sweat will cause settling, so there is a tendency for the user to replace it even when only a small amount of sweat is absorbed. Will be burdensome. Therefore, the average porosity of the entire absorption layer 3 is preferably 10 to 30%, and more preferably 10 to 20%.

  Furthermore, it is preferable to include an absorbent fiber in order to absorb the sweat when absorbing sweat. In addition, if the amount of the water-absorbing fiber to be blended in the absorbent layer is too small, it absorbs a large amount of sweat and does not cause settling even though the absorbent layer is saturated with sweat. If the amount of fibers is too large, even if the amount of sweat is small, there is a tendency for stickiness to occur. Therefore, the absorbent layer preferably contains 30 to 80% or more by weight of water-absorbing fibers, and more preferably 40 to 70% or more.

  Such a sweat-removing sheet can be obtained by, as described above, for example, by forming an absorbent layer manufactured by regulating the heating temperature, pressure, and fiber thickness at the time of manufacture, for example, by the airlaid method. it can. Sweat removal that can be replaced at a more appropriate timing by forming an absorption layer in which a low porosity layer and a high porosity layer having a porosity of 15 to 40% are integrally formed without a contact surface Sheet.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect of this invention is not limited to the said embodiment.

  For example, a layer containing a deodorant may be interposed between one or both of the absorbent layer 3 and the surface layer 10 and between the absorbent layer 3 and the back surface layer 11. Thereby, the unpleasant odor emitted from sweat can be reduced. In this case, a deodorant is preferably interposed between the absorption layer 3 and the back layer 11. Thereby, the irritation | stimulation of the deodorizer to the skin at the time of mounting | wearing can be avoided, and a itch and a rash can be prevented.

  When manufacturing such a body fluid absorptive sheet 1, it can manufacture by the following processes, for example.

  An aggregate of cellulosic fibers and synthetic fibers constituting the absorbent layer 3 on a surface layer 10 such as a non-woven fabric made of cotton, rayon / synthetic fibers or a mixture of these fibers, and known heat-fusibility Place the mixture with the powder. A deodorant is sprayed on the fiber which comprises the absorption layer 3, and it heats. Furthermore, the back layer 11 made of, for example, a polyethylene film is overlaid on the sprayed deodorant, and the absorbent layer 3 and the back layer 11 are bonded to each other with a known hot melt adhesive. When heating, the polyethylene enveloping layer of the composite fiber constituting the absorption layer 3 and the heat-fusible powder function as a binder.

  In addition, the surface layer 10 and / or the absorption layer 3 are impregnated with a fragrance, and the function of masking the odor of sweat by the fragrance of the fragrance and the cooling sensation component such as menthol are impregnated to give the user a feeling of cooling. A function for improving the image quality may be added.

  In addition, the peripheral edge of the sheet is pressure-bonded by heat and pressure, and the outer peripheral seal is provided to provide a thickness difference between the peripheral edge of the sheet and the top of the sheet, thereby improving the absorbability of body fluid. Can be made.

  The body fluid-absorbing sheet 1 of the present embodiment can absorb body fluid suitably without limiting body fluid such as menstrual blood, vaginal discharge, blood, sweat, etc., but is preferably used as a sheet for sweat removal. . As a sweat removing sheet, it is particularly suitable to be used for removing sweat on the side, but it is also possible to use it by sticking it to the corresponding part of the inner surface of clothes for removing sweat on the chest, back, neck, crotch, etc. Is possible.

  Moreover, although the bodily fluid absorptive sheet 1 of this embodiment was provided with the surface layer 10, the back surface layer 11, and the adhesion layer 12, you may be comprised only by the absorption layer 3. FIG. In this case, the body fluid is absorbed by sticking the absorbent layer 3 to the skin or clothes with an adhesive tape (not shown).

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to this embodiment.

  Using the bodily fluid absorbent sheet 1 shown in the above embodiment, a test for measuring the amount of water reversing and a test for measuring the water absorption rate were performed.

  The test is performed by changing the production conditions of the body fluid absorbent sheet 1 to obtain the porosity of the low porosity layer 5 and the high porosity layer 7, the blending ratio of the absorbent fibers, and the total basis weight of the absorbent layer 3 and the surface layer 10. In addition, according to whether or not the absorption layer 3 is integrally formed, seven sample samples (Examples 1 to 7) and four comparative sample samples (Comparative Examples 1 to 4), which are respectively changed. went.

  Tables 1 and 2 show the configurations of Examples and Comparative Examples, production conditions in the airlaid method (when the absorption layer is integrally formed), and measurement results, respectively.

  In addition, in Examples 1 and 2, and Comparative Example 2 and four additional comparative sample samples (Comparative Examples 5 to 8), (A) initial wearing, when a small amount of sweat was absorbed, and a large amount of sweat was absorbed Table 3 shows the results of evaluation of the discomfort of each case, (B) the presence or absence of each replacement in the initial stage, when sweating a small amount, and when sweating a large amount of sweat, and (C) the presence or absence of sweat spots after use. Shown in

(Reversion improvement rate)
In the test for measuring the amount of water returned, first, the body fluid absorbent sheet 1 cut to 4 cm × 4 cm was allowed to absorb 1 ml of distilled water from the skin contact surface side of the surface layer 10 and left for 1 minute. A 7 cm × 15 cm filter paper (Qualitative filter paper No. 2 manufactured by Advantech Toyo) is placed on top 10, and a weight (weight 1 kg, width 155 mm, depth 65 mm, height 12 mm) is placed on the top 10 and left for another 1 minute. Distilled water was absorbed into the filter paper.

  Then, the amount of water reversal was calculated from the difference between the weight of the filter paper after water absorption and the weight of the filter paper before water absorption, and the reversion improvement rate was determined from the calculated amount of reversion.

  The reversion improvement rate is calculated by the following equation based on the return amount of Comparative Example 1.

Return improvement rate (%) = (return amount (g) of comparative example 1 / return amount (g) of each example or comparative example) × 100 (3)
(Absorption rate improvement rate)
In the test for measuring the water absorption rate, as shown in FIG. 3, the absorption rate measurement plate 20 is placed on the surface layer 10 of the body fluid absorbent sheet 1 cut into 4.0 cm × 4.0 cm, and the surface layer 10 The burette 30 was placed so that the tip was positioned 1 cm above the skin contact surface of the skin, and 1 ml of colored water was dropped from the burette 30 into the central hole of the absorption rate measurement plate.

  The absorption rate measuring plate 20 has a receiving portion 21 having a plurality of holes 22 (eight holes having a diameter of 3 mm are arranged around a hole having a diameter of 6 mm, and further, a hole having a diameter of 1 mm is arranged on the periphery thereof). The colored water dropped from the burette 30 is accommodated in the accommodating portion 21 and then passed through the pores and absorbed by the body fluid-absorbing sheet 1.

  Then, the time from when the colored water of the burette 30 was dropped until the colored water was completely absorbed by the body fluid-absorbent sheet 1 was measured, and the absorption rate improvement rate was determined from the measured time.

  The absorption rate improvement rate is calculated by the following equation using the absorption time of Comparative Example 1 as a reference.

Absorption rate improvement rate (%) = (absorption time of comparative example 1 (second) / absorption time of each example or comparative example (second)) × 100 (4)
The porosity of the absorption layer 3 was determined as follows. First, a cross-sectional image of the body fluid-absorbing sheet 1 cut into a strip having a width of 0.1 cm is taken, and image processing software (Adobe Systems) is used so that the void portion becomes a black pixel and the fiber portion becomes a white pixel. Binarization using a photoshop). Thereafter, the total number of pixels G (pixels) and the number of black pixels F (pixels) in an arbitrary region were measured, and the void ratio was obtained from the number of pixels according to the following equation.

Porosity (%) = F / G × 100 (5)
As is clear from the present embodiment, the absorption layer 3 is composed of the low porosity layer 5 and the high porosity layer 7 and the porosity of both is defined within a preferable range, thereby reducing reversal. It can be seen that the absorption rate can be increased.
(Discomfort test 1)
A pressure-sensitive adhesive layer was provided, and a total of 7 samples of Examples 1 and 2 and Comparative Examples 2 and 5-8 were cut into 8 cm × 8 cm and subjected to sensory evaluation when mounted on the side.

In the test, keep wearing the sheet until it absorbs a large amount of sweat, `` feeling uncomfortable at the beginning of wearing '', `` discomfort when wearing a small amount of sweat (discomfort resulting from changes to the initial texture) '', The average value (fractional values are rounded off) of the three grades (1 to 5 points) for each item of “Uncomfortable feeling (discomfort arising from changes to the initial texture)” was calculated.
(Discomfort test 2)
In the test, a pressure-sensitive adhesive layer was provided, and a total of 7 samples of Examples 1 and 2 and Comparative Examples 2 and 5 to 8 were cut into 8 cm × 8 cm, attached to the side, and a little sweat was applied at the beginning of use. It was evaluated whether or not the user would change when he sweated a lot.

  When the discomfort during use was so great that it could not be used, the user removed the seat. In addition, the presence or absence of sweat spots on the clothing at the end of use was confirmed.

  Existence of sweat blemishes at the end of use, and the initial feeling of wearing, when feeling a little sweat, and when feeling a lot of sweat The overall evaluation was performed by the two-step evaluation.

  In Examples 1 to 7, the porosity of the high-porosity layer 7 is in the range of 15-40%, 10% and 13% of less than 15%, and Comparative Examples 2 and 3, and more than 40% Compared to Comparative Examples 1 and 4 which were 47% and 50%, the improvement was in terms of reversion and absorption rate.

  Among the above-described embodiments, in Embodiments 1 to 6, the low porosity layer 5 and the high porosity layer 7 are integrally formed without an adhesive layer, and are not integrally formed. Compared with Example 7, it was excellent in terms of the amount of reversion and the absorption rate.

  Further, among the above-described examples, Examples 1 to 5 are the same as Example 6 in which the absorbent fiber 3 is mixed with absorbent fibers at a weight ratio of 30% or more and the blending ratio is less than 30%. Compared with the amount of reversion and absorption speed, it was excellent.

Furthermore, among the above examples, Examples 1 to 4 are Comparative Examples 5 in which the total basis weight of the absorption layer 3 and the surface layer 10 is 120 g / m ² or more and less than 120 g / m ^2. Compared to the above, the amount of reversion and the absorption rate were excellent.

  In addition, since Examples 1 and 2 were excellent in the initial feeling of wearing and did not sag even with a small amount of sweat, there was no sense of incongruity when absorbing a small amount of sweat at the beginning of use and the user did not replace the seat. However, when a large amount of sweat was absorbed, the user replaced the seat with a sense of discomfort due to the difference in texture due to drooping. As a result, the overall evaluation of the user was good without causing sweat spots on clothes.

  In Comparative Example 2, the user removed the sheet at an initial stage because of the uncomfortable feeling due to the small initial thickness difference. In Comparative Example 5, the user removed the sheet at the initial stage because of the uncomfortable feeling due to the large initial thickness. In Comparative Example 6, although the initial uncomfortable feeling was small, even when a small amount of sweat was absorbed, the user took off the sheet due to the uncomfortable feeling resulting from it. Since the comparative example 7 had a small initial thickness difference and a sense of incongruity, the user removed the sheet at the initial stage. Since the comparative example 8 had a small initial thickness difference and was uncomfortable, the user removed the sheet at the initial stage. When the sample of Comparative Example 8 is used until it absorbs a large amount of sweat while bearing the initial discomfort, it does not sag even if a large amount of sweat is absorbed, and the user recognizes an appropriate replacement time. As it was not possible, sweat sweat occurred. From these results, Examples 1 and 2 were able to appropriately determine the replacement time compared with the samples of Comparative Example 2 and Comparative Examples 5 to 8, and were excellent in sweat spot prevention.

It is a top view of the bodily fluid absorptive sheet concerning one embodiment of the present invention. It is AA sectional drawing of FIG. It is a figure for demonstrating an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body fluid absorptive sheet 3 Absorbing layer 5 Low porosity layer 7 High porosity layer 10 Surface layer 11 Back surface layer 12 Adhesive layer 15 Boundary line

Claims (6)

An absorbent layer that absorbs body fluids ;
A back layer disposed on the non-skin contact surface side of the absorbent layer and preventing the outflow of bodily fluid absorbed by the absorbent layer ,
A side sweating sheet to be used by attaching to the inner side of the side part of the clothes,
The sweat removing sheet has a thickness of 1.0 to 3.5 mm.
The absorption layer is composed of a low porosity layer having a porosity of 5% or less and a high porosity layer having a porosity of more than 5% located on the non-skin contact surface side of the low porosity layer,
The high porosity layer is a side sweat removing sheet including a layer having a porosity of 15 to 40%. 2. The side sweating sheet according to claim 1, wherein the absorption layer is formed integrally with the low porosity layer and the high porosity layer without an adhesive layer interposed therebetween. The sheet for sweating of a side part according to claim 1 or 2, wherein an average porosity of the entire absorbent layer is 10 to 30%. The said absorption layer is a sheet | seat for the sweating of the side part in any one of Claim 1 to 3 which consists of nonwoven fabrics . The side layer sweat- absorbing sheet according to any one of claims 1 to 4, wherein the absorbent layer contains 30% or more of water-absorbing fibers in a weight ratio . A surface layer laminated on at least a part of the absorption layer on the skin contact surface side of the low porosity layer;
The sheet for sweating a side part according to any one of claims 1 to 5, wherein a total basis weight of the absorbent layer and the surface layer is 120 g / m ² or more .