Fluid absorbing pad

Abstract

To provide a pad material for body fluid absorption capable of improving absorption rate of a body fluid and achieving preferable use feeling.SOLUTION: A pad material 1 for body fluid absorption comprises: an absorber 3 for absorbing a body fluid; a top sheet 2 provided on a surface on a skin side of the absorber 3; and a back sheet 4 provided on a surface being opposite to the top sheet 2 of the absorber 3. The top sheet 2 is configured so that an average surface friction coefficient in dryness time on at least a body fluid transmission region of a surface contacting a skin of a wearer is 0.2 or greater and 0.8 or smaller, and an average surface friction coefficient in humectation time is 0.4 or greater and 0.7 or smaller.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a body fluid absorbing patch which is worn on underwear or the like to absorb body fluids such as vaginal discharge, menstrual blood, sweat, and urine. [Background technology]

[0002] Body fluid absorbing pads have been used to absorb body fluids such as vaginal discharge, menstrual blood, sweat, urine, etc. Body fluid absorbing pads have a structure in which an absorbent body is sandwiched between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the top sheet is brought into contact with the skin, and the absorbent body absorbs body fluids that have permeated the top sheet.

[0003] In order to improve comfort when using a body fluid absorbing pad, it is important to increase the absorption rate of the body fluid of the body fluid absorbing pad so that the body fluid does not come into contact with the skin and does not remain on the top sheet. As a means for achieving this, for example, Patent Documents 1 and 2 disclose a technique in which a hydrophilic sheet is interposed between the top sheet and the absorbent and the top sheet and the hydrophilic sheet are joined by multiple embossings, and a technique in which the top sheet has an uneven structure to provide a space between the absorbent and the top sheet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-49697 A [Patent Document 2] JP 2014-110809 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the top sheet has unevenness, as in the bodily fluid absorbing pads of Patent Documents 1 and 2, the top sheet feels rough and hard. The top sheet comes into direct contact with the skin of the user when the bodily fluid absorbing pad is in use, and therefore has a significant effect on comfort. If the top sheet is not smooth, the bodily fluid absorbing pad feels rough to wear and uncomfortable for the user, which impairs the comfort of use.

[0006] The present invention has been made to solve the above problems, and has an object to provide a body fluid absorbing patch which can improve the absorption rate of body fluids and provide a good feeling of use. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above problems and have found that a bodily fluid absorbing pad having a top sheet with a certain degree of smoothness provides a smooth and gentle feel during use, and improves the absorption rate of bodily fluids. The present invention has been completed based on this finding. That is, the present invention provides a bodily fluid absorbing pad having the following aspects:

[0008] The body fluid absorbing pad of the present invention comprises at least an absorbent body that absorbs body fluids, a top sheet provided on the skin side of the absorbent body, and a back sheet provided on the side of the absorbent body opposite the top sheet, and is characterized in that the top sheet has an average surface friction coefficient when dry of 0.2 or more and 0.8 or less, and an average surface friction coefficient when wet of 0.4 or more and 0.7 or less, at least in the body fluid permeable area of ​​the surface that comes into contact with the skin.

[0009] In the body fluid absorbing pad of the present invention, the top sheet preferably contains natural fibers as a material.

[0010] In the body fluid absorbing pad of the present invention, the top sheet is preferably made of only natural fibers.

[0011] In the body fluid absorbing patch of the present invention, the natural fiber is preferably cotton. Effect of the Invention

[0012] According to the body fluid absorbing pad of the present invention, the top sheet has a smooth feel both when dry and when wet, and provides a good wearing comfort (texture), and the absorption rate of discharged body fluid is increased, so that discharged body fluid is less likely to remain on the top sheet and the body fluid is prevented from coming into contact with the skin, thereby improving comfort during use and providing a good feeling of use. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a plan view of the body fluid absorbing patch of the present embodiment. [Diagram 2] FIG. 2 is a bottom view of the body fluid absorbing patch of the present embodiment. [Diagram 3] 2 is a cross-sectional view taken along line AA in FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the body fluid absorbing pad of the present invention will be described with reference to the attached drawings. The body fluid absorbing pad of the present invention has a multi-layer structure including at least a top sheet, a back sheet, and an absorbent sandwiched between the top sheet and the back sheet, and is used to absorb body fluids such as vaginal discharge, menstrual blood, sweat, and urine by being attached to a user's clothing such as underwear or directly to the skin. Examples of body fluid absorbing pads include vaginal discharge sheets (panty liners), sanitary napkins, incontinence pads, and sweat absorption sheets.

[0015] 1 to 3 show one embodiment of the body fluid absorbing pad of the present invention. The body fluid absorbing pad 1 of this embodiment has a three-layer structure in which a top sheet 2, an absorbent body 3, and a back sheet 4 are laminated in this order from the side that contacts the user's skin (front side), and an adhesive layer 5 is formed on the back surface of the back sheet 4 side for attaching the body fluid absorbing pad 1 to clothing such as underwear.

[0016] The thickness and size of the body fluid absorbing patch 1 are not particularly limited, and can be appropriately set according to the part to be attached. The shape of the body fluid absorbing patch 1 is also not particularly limited, and although the body fluid absorbing patch 1 has a roughly gourd shape in a plan view in this embodiment, it can have various other shapes such as a rectangular shape, a square shape, a circle shape, an ellipse shape, an oval shape, a polygonal shape, etc., according to the part to be attached (purpose of use).

[0017] The top sheet 2 has liquid permeability that allows bodily fluids to pass through it when it comes into contact with the skin of the user, thereby allowing the bodily fluids to penetrate into the underlying absorbent body 3. The top sheet 2 is not particularly limited as long as it has liquid permeability, and for example, woven fabrics, knitted fabrics, nonwoven fabrics, felts, etc. can be used. Among these, nonwoven fabrics are preferred from the viewpoints of good touch, skin irritation, and absorbency.

[0018] Furthermore, the material constituting the top sheet 2 is not particularly limited, and examples thereof include synthetic fibers such as polyester fibers, polyamide fibers, acrylic fibers, polypropylene fibers, polyethylene / polyester composite fibers, and polyethylene / polypropylene composite fibers; natural fibers such as cotton, silk, pulp, wool, and hemp; semi-synthetic fibers such as rayon fibers and acetate fibers; and fibers made by mixing various fibers (blended fibers, mixed fiber products), but in order to achieve a good feel against the skin, natural fibers are preferred, and cotton is particularly preferred. The top sheet 2 is not limited to being a single layer, and may be composed of a laminate of multiple or more layers.

[0019] The absorbent 3 is not particularly limited as long as it has the ability to absorb body fluids, and may be a known absorbent material such as absorbent pulp or absorbent polymer, which is generally used in sanitary napkins, panty liners, diapers, sweat absorbing sheets, etc., or a fiber structure composed of woven fabric, knitted fabric, nonwoven fabric, or pulp product. Among them, it is preferable to use an assembly (e.g., nonwoven fabric) made of natural fibers and synthetic fibers, in terms of pleasant touch and excellent absorbency. Examples of natural fibers include cotton, silk, pulp, wool, and hemp. Among these natural fibers, cellulose-based fibers such as cotton and pulp (not containing protein components) are preferable, in terms of their low incidence of contact dermatitis such as allergies, low incidence of rashes, and high absorbency. Examples of synthetic fibers include nylon fibers, polyethylene fibers, polyester fibers, polyamide fibers, acrylic fibers, polyvinyl alcohol fibers, polypropylene fibers, polyethylene terephthalate fibers, ethylene vinyl acetate fibers, urethane fibers, and acrylic fibers. Also usable are semi-synthetic fibers such as rayon fibers, acetate fibers, and cupra, as well as blends and mixed fibers of various fibers. Among them, synthetic fibers such as ethylene vinyl acetate fibers, polypropylene fibers, polyethylene fibers, polyester fibers, and polyethylene terephthalate fibers, or composite fibers thereof, are preferred in terms of dryness and texture. Examples of composite fibers include polyethylene / polyester (including polyethylene terephthalate) composite fibers, polyethylene / polypropylene composite fibers, and ethylene vinyl acetate / polypropylene composite fibers. These may be used alone or in combination of two or more. An example of a combination of two or more types is a combination of cellulosic fibers and composite fibers, and the blending ratio can be, for example, 4:6 to 8:2.

[0020] The back sheet 4 has liquid impermeability that prevents the outflow of bodily fluids absorbed in the absorber 3 to the outside. The back sheet 4 is not particularly limited as long as it has liquid impermeability, and may be, for example, a film, a liquid impermeable nonwoven fabric such as SMS, or a spunbonded nonwoven fabric or a point bonded nonwoven fabric laminated with a resin film. Examples of liquid impermeable films include films made of polyethylene, polypropylene, polyester, nylon, polyvinyl alcohol, cellophane, vinyl chloride, etc., or multilayer films of these materials.

[0021] The nonwoven fabrics described above can be manufactured by methods such as wet papermaking, dry papermaking, spunbonding, meltblowing, latex resin bonding, solvent bonding, stitch bonding, needle punching, spunlace, thermal bonding, air-through, air-laid, etc. Among these, the spunlace, thermal bonding, air-through, air-laid, needle punching, spunbonding, etc. are preferred, as these methods provide a good texture and are safer for the skin because they do not use adhesives or solvents.

[0022] The method for bonding the top sheet 2, absorbent body 3, and back sheet 4 is not particularly limited, and they can be bonded with an adhesive such as a water-soluble adhesive (e.g., an acrylic water-soluble adhesive) or a water-insoluble adhesive (e.g., a rubber-based hot melt or an olefin-based hot melt). The top sheet 2, absorbent body 3, and back sheet 4 may be bonded to each other by a bonding portion 6 by bonding the top sheet 2, absorbent body 3, and back sheet 4 to the entire peripheral edges or the vicinity of the peripheral edges by compression bonding (e.g., thermocompression bonding, ultrasonic compression bonding). It is not necessary to form the compression portion 6.

[0023] The adhesive layer 5 is provided by applying an adhesive to the back sheet 4. The adhesive used in the adhesive layer 5 is not particularly limited as long as it can attach the body fluid absorbing patch 1 to underwear, and examples of the adhesive include water-soluble adhesives (e.g., acrylic water-soluble adhesives) and water-insoluble adhesives (e.g., rubber-based hot melt, olefin-based hot melt). Among them, water-insoluble adhesives are preferred because they have superior adhesive strength to underwear compared to other adhesives, and rubber-based hot melts are more preferred. The adhesive layer 5 may be provided so as to cover almost the entire area of ​​the back sheet 4, or may be provided partially on the back sheet 4 (in stripes spaced at regular intervals in FIG. 2).

[0024] The body fluid absorbing pad 1 is not necessarily limited to the three-layer structure described above, but may have a layer structure of four or more layers, for example by providing a sheet between the top sheet 2 and the absorbent body 3 that has a liquid permeability effect, a diffusion effect, or the effect of preventing body fluids from flowing back to the surface side.

[0025] The body fluid absorbent pad 1 having the above-mentioned configuration has a dry average surface friction coefficient (dry MIU) of 0.2 or more and 0.8 or less in the body fluid permeable area of ​​the surface of the top sheet 2 that comes into contact with the skin (front surface, hereafter referred to as the "skin-contacting surface"), and a wet average surface friction coefficient (wet MIU) of 0.4 or more and 0.7 or less.

[0026] Here, the bodily fluid permeable region refers to a region that faces the excretion part of bodily fluids when worn on the body, and in this embodiment, it is located approximately in the center of the top sheet 2 as shown by the dashed line in Fig. 1, but the position and size of the bodily fluid permeable region can be appropriately adjusted depending on the wearing site (purpose of use) of the bodily fluid absorbent patch 1 and the way of wearing it on the wearing site (conditions of use), and are not particularly limited. Note that the average surface friction coefficient in the dry state may be 0.2 to 0.8 and the average surface friction coefficient in the wet state may be 0.4 to 0.7 in the entire area (excluding the pressure-bonded part 6) including the bodily fluid permeable region of the skin contact surface of the top sheet 2.

[0027] The average surface friction coefficient is an index that indicates the texture of the skin-contacting surface of the top sheet 2; the smaller the value, the less resistant and slimy the skin-contacting surface is to the skin, and the smoother the skin-contacting surface is; when friction occurs between the skin and the surface, it feels smooth and not rough, and has a smaller effect on the skin.

[0028] The average surface friction coefficient in a dry state refers to the average surface friction coefficient of the top sheet 2 when the body fluid absorbent pad 1 is in a dry state before absorbing body fluid. In addition to the average surface friction coefficient of the top sheet 2 when dry, the average surface friction coefficient of the top sheet 2 when the body fluid absorbent pad 1 is wet is small, so that after wearing the body fluid absorbent pad 1, the top sheet 2 feels smooth to the touch before absorbing body fluid and even after absorbing body fluid, providing a good wearing comfort (feel).

[0029] In addition, the inventor of the present application has conducted extensive research into what properties the body fluid absorbing pad must have in order to increase the absorption rate of body fluids, and has found that the average surface friction coefficient of the top sheet of the body fluid absorbing pad when dry is closely related to the average surface friction coefficient of the top sheet when wet. Therefore, the body fluid absorbing pad 1 of this embodiment is characterized in that the average surface friction coefficient of the top sheet 2 when dry and the average surface friction coefficient of the top sheet 2 when wet are 0.2 to 0.8 and 0.4 to 0.7, respectively, which provide an excellent absorption rate of body fluids. As a result, the body fluid absorbing pad 1 of this embodiment has a top sheet 2 with good smoothness when dry and when wet, and at the same time has a high absorption rate of body fluids, so that the body fluid discharged into the body fluid absorbing pad 1 is less likely to remain on the top sheet 2, and the body fluid is prevented from touching the skin. Therefore, the user does not feel uncomfortable when using the body fluid absorbing pad 1, and the comfort of the body fluid absorbing pad 1 can be further increased, resulting in a good feeling of use.

[0030] In order to increase the body fluid absorption rate of the body fluid absorbing pad 1, it is preferable that the average surface friction coefficient of the top sheet 2 when dry is 0.3 or more and 0.8 or less, and that the average surface friction coefficient of the top sheet 2 when wet is 0.4 or more and 0.7 or less, and it is even more preferable that the average surface friction coefficient of the top sheet 2 when dry is 0.3 or more and 0.6 or less, and that the average surface friction coefficient of the top sheet 2 when wet is 0.6 or more and 0.7 or less.

[0031] The average surface friction coefficient can be measured by the following method. Specifically, a test piece of the body fluid absorbing patch 1 is prepared according to a friction distance of 30 mm, and the average surface friction coefficient of the test piece is measured using a surface friction coefficient measuring device (KES-FB4-AUTO-A) manufactured by Kato Tech Co., Ltd. The size of the test piece is 150 mm in length and 50 mm in width, and the measurement conditions are a standard friction probe (fingerprint type) and a friction load of 25 gf / cm. 2 , and the measurement sensitivity is L (high sensitivity 100 g / V). Other conditions such as friction distance and friction speed are in accordance with the device specifications (friction distance 30 mm, analysis distance 20 mm, sample movement speed 1 mm / sec). The average surface friction coefficient is the average value of the friction coefficients of the test piece surface (surface on the top sheet 2 side) measured over an analysis distance of 20 mm. The average surface friction coefficient when wet is measured after applying 1 g of physiological saline (25°C) as evenly as possible to the surface (surface on the top sheet 2 side) of a dry test piece and leaving it to stand for 10 seconds.

[0032] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the body fluid absorbing pad 1 of the above embodiment does not have unevenness formed by embossing or the like on the surface (excluding the pressure-bonded portion 6) on the top sheet 2 side. Although it is preferable that unevenness is not formed by embossing or the like, the body fluid permeable region (excluding the pressure-bonded portion 6) may have unevenness formed by embossing or the like as long as the average surface friction coefficient of the top sheet 2 in the dry and wet states is within the above-mentioned predetermined numerical range. Note that, in the region other than the body fluid permeable region, unevenness may be formed by embossing or the like regardless of the average surface friction coefficient of the top sheet 2 in the dry and wet states. EXAMPLES

[0033] The present invention will be described in more detail below with reference to examples, but the content of the present invention is not limited to the following examples.

[0034] In order to confirm the effect of the body fluid absorbing pad of the present invention, a test was performed on the absorption rate of body fluid. The body fluid absorbing pad used in Examples 1 to 6 and Comparative Examples 1 to 5 is the same as the configuration shown in the above embodiment, in which a top sheet, an absorbent body, and a back sheet are laminated using an adhesive, and the materials related to the top sheet, absorbent body, and back sheet are as follows. Surface sheet: Cotton (Examples 1 to 4) Polyethylene, polyester (Example 5) Polyethylene, polypropylene, polyester (Example 6) Cotton (Comparative Examples 1-2, 4-5) Cotton, rayon, polyester (Comparative Example 3) Absorbent: Thermalbond nonwoven fabric (same for all examples) Backsheet: Polyethylene film (same for all examples)

[0035] The average surface friction coefficient (dry MIU) of each example of the body fluid absorption pad in the dry state was calculated by the above-mentioned measurement method using a KES-FB4-AUTO-A surface friction coefficient measuring device (manufactured by Kato Tech Co., Ltd.) after fixing the body fluid absorption pad with the top sheet side up on the table of the measuring device using double-sided tape. The average surface friction coefficient (wet MIU) of each example of the body fluid absorption pad in the wet state was calculated by fixing the body fluid absorption pad on the table of the measuring device in the same manner, applying 1 g of physiological saline evenly to the top sheet side surface using a pipette and leaving it to stand for 10 seconds, and then calculating it by the above-mentioned measurement method.

[0036] The absorption speed of the body fluids of each example of the body fluid absorbing patch was measured by dropping 1 mL of physiological saline onto the body fluid permeable area using a pipette, and measuring the time it took for the physiological saline to be absorbed. The shorter the absorption speed, the higher the evaluation, with less than 1.25 seconds being rated as "◎", 1.25 to 1.80 seconds being rated as "○", and 1.80 seconds or more being rated as "×". The results are shown in Table 1.

[0037] [Table 1]

[0038] From the results in Table 1, it was confirmed that the bodily fluid absorbing pads of Examples 1 to 5, in which the average surface friction coefficient of the top sheet when dry is 0.2 to 0.8 and the average surface friction coefficient of the top sheet when wet is 0.4 to 0.7, have a superior absorption rate of bodily fluid compared to the bodily fluid absorbing pads of Comparative Examples 1 to 5, and can effectively prevent bodily fluid from remaining on the top sheet. Therefore, it is found that discomfort such as bodily fluid touching the skin is less likely to be felt when using the bodily fluid absorbing pad, and the comfort of the bodily fluid absorbing pad is improved, resulting in a good feeling in use.

[0039] It was also confirmed that the bodily fluid absorbing pads of Examples 2, 3, 5, and 6, in which the average surface friction coefficient of the top sheet 2 when dry is 0.3 to 0.8 and the average surface friction coefficient of the top sheet 2 when wet is 0.4 to 0.7, have a superior absorption rate of bodily fluids and can more effectively prevent bodily fluids from remaining on the top sheet. It was also confirmed that the bodily fluid absorbing pads of Examples 2 and 3, in which the average surface friction coefficient of the top sheet 2 when dry is 0.3 to 0.6 and the average surface friction coefficient of the top sheet 2 when wet is 0.6 to 0.7, have a significantly superior absorption rate of bodily fluids and can more effectively prevent bodily fluids from remaining on the top sheet. [Explanation of symbols]

[0040] 1. Fluid absorbing patch 2 Top sheet 3. Absorber 4 Back Seat 5 Adhesive layer

Claims

1. An absorbent that absorbs bodily fluids; a top sheet provided on the skin side of the absorbent body and in contact with the skin to allow bodily fluids to pass through; A liquid-impermeable back sheet provided on the surface of the absorbent body opposite to the top sheet; An adhesive layer that is provided on a surface of the back sheet opposite to the absorbent body and can be attached to underwear; At least The top sheet is a body fluid absorbing pad having an average surface friction coefficient when dry of 0.2 or more and 0.8 or less, and an average surface friction coefficient when wet of 0.4 or more and 0.7 or less, at least in the body fluid permeable region of the surface that comes into contact with the skin.

2. 2. The body fluid absorbing pad according to claim 1, wherein the top sheet contains natural fibers as a material.

3. 2. The body fluid absorbing pad according to claim 1, wherein the top sheet is made of only natural fibers.

4. 4. The body fluid absorbing patch according to claim 2 or 3, wherein the natural fiber is cotton.

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