JP2018121689A - Absorbent pad for hair washing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent pad for washing hair, which can easily perform a rinsing operation after shampooing in a relatively narrow work space, and can cleanly wash away bubbles from shampoo from a person to be washed. SOLUTION: A hair wash absorbing pad 1 is used for absorbing hot water used for washing hair, and has a skin facing surface arranged at a position relatively close to the head of a person to be washed at the time of use, and the head. A front surface sheet 2 having a non-skin facing surface arranged at a position relatively far from the portion and located on the skin facing surface side, a back surface sheet 3 located on the non-skin compatible surface side, and both sheets 2 and 3. It includes an absorber 4 arranged between them. The foam absorbing time of the hair washing absorbing pad 1 is 30 seconds or less. The surface sheet 2 contains a defoaming agent and a defoaming aid. [Selection diagram] Fig. 3

Description

  The present invention relates to an absorbent pad for shampoo that is used for absorbing hot water used for shampooing and can be suitably used when a caregiver performs shampooing of a bedridden in the state of bedbed.

  In hospitals and care facilities, shampooing is regularly performed for patients and caregivers who cannot move their bodies in bed or futons while staying in bed. Washing of the bedridden person is considered to be one of important patient care because it can be expected not only to hygiene that the hair is kept clean but also to relax the mind and body of the bedridden person. Conventionally, a water-absorbing disposable diaper is sometimes used for washing the hair of a bedridden person in order to prevent the bed from getting wet or soiled by washing the hair. That is, a disposable diaper cut into an appropriate shape and size is laid under the head of the bedridden and washed, but a diaper that is originally used to absorb excrement such as urine is used. Applying to the head can be a major stress factor for the bedridden, and diapers used as rugs are not designed for shampooing purposes, so it is difficult to say that they are easy to use in shampooing. There is room for improvement.

  Conventionally, a hair washing tool called Kelly Pad (registered trademark) or a self-made hair washing tool having a configuration similar to that of the Kelly pad has been used as a dedicated hair washing tool for the bedridden. The kelly pad includes a pad on which the head of the bedridden is placed, and a drainage channel connected to the pad. In use, the pad is arranged below the head of the bedbill, and one end of the drainage channel is connected to the paddle. It is placed in a lower position than the bedridden person, for example, in a bucket placed under the bed where the bedbed person is sleeping, and in this state, hair washing is performed while flowing hot water from above the bedbed person toward the hair. According to such a hair washing method, the hot water used for washing the hair passes through the drainage channel and accumulates in the bucket under the bed, so that the hair can be washed without getting the bed and the futon wet. However, such a hair washing method has room for improvement, such as troublesome preparation and clean-up and worries about water leakage.

  In Patent Document 1, a washing sheet that can be used for washing hair by a bedridden has a rectangular shape in plan view, one surface is covered with a waterproof sheet, and an absorbent such as a water-absorbing polymer is accommodated inside the central portion. The configuration is described. According to the cleaning sheet described in Patent Document 1, since it contains an absorbent, it is possible to clean the body using water without leaking water around it, and it has a rectangular shape in plan view. Therefore, it is said that a large amount of water can be absorbed by using the absorbent efficiently.

  In Patent Document 2, the non-woven fabric that is excellent in concealability and liquid residue suppressing effect and can be suitably used as a surface sheet in an absorbent article such as a sanitary napkin, For the purpose of increasing the hydrophilicity of the surface of the constituent fibers, a fiber treatment agent containing a polyorganosiloxane, an anionic surfactant and an alkylhydroxysulfobetaine is described.

Japanese Patent Laid-Open No. 2003-210352 Japanese Patent Laid-Open No. 2006-69748

  In the washing of a bedridden person, the shampoo is usually washed with a shampoo on the hair with an absorbent pad under the head of the bedbed, and then rinsed with hot water. This shampoo washout contains foam from shampoo in addition to hot water. Absorbent pads used in conventional shampoos, including disposable diapers, can absorb hot water in the washout, but not foam. Therefore, even after the hot water in the washing solution is absorbed by the absorbent pad, only the foam remains on the absorbent pad, and the foam remaining on the absorbent pad is transferred to the hair, ears, neck, etc. of the bedridden person, There is a problem that bubbles continue to remain on the head and neck of the bedridden person. Conventionally, in order to remove such persistent bubbles on the body, the rinsing of the hair after shampooing is divided into a plurality of times, and the second and subsequent rinsing positions on the absorbent pad are changed from the previous rinsing position. Since the method of changing is adopted, since this hair washing method needs to move the head of the bedrider every time the rinsing position is changed, the rinsing work becomes complicated and the working time becomes long, Moreover, since it is necessary to use a comparatively large absorbent pad, it is necessary to secure a relatively large working space corresponding to the pad. However, in hospitals, nursing homes, and home care sites where washing of the bedridden is mainly performed, it is often difficult to secure time and work space for washing the hair, and the rinsing after shampoo is relatively narrow. There is a need for a technique that can be easily implemented in a work space.

  Therefore, the present invention relates to providing an absorbent pad for shampooing that can easily perform a rinsing operation after shampooing in a relatively narrow work space and that can cleanly wash away foam caused by shampooing from a person to be washed.

  The present invention is used for absorption of hot water used for washing hair, and is disposed at a position facing the skin relatively close to the head of the person to be washed at the time of use and a position relatively far from the head. An absorbent pad for shampooing comprising a top sheet positioned on the skin facing surface side, a back sheet positioned on the non-skin facing surface side, and an absorbent body disposed between both sheets. And the absorption pad for hair washing which the foaming time measured by the following method is 30 second or less is provided.

<Measurement method of foam absorption time>
An absorption pad to be evaluated is placed on a horizontal surface with the skin facing surface facing upward, and a transparent cylindrical portion having an inner diameter of 36 mm and having both axial ends open on the skin facing surface of the absorption pad. The foam injection tool provided is placed so that the axial direction of the cylindrical portion coincides with the vertical direction. Thus, in the state where the foam injection tool is placed on the absorbent pad, the measurement target part surrounded by the cylindrical part in the absorbent pad can be visually recognized from the outside through the transparent cylindrical part. From this state, first, the foam prepared by the pump dispenser is put in a container, and the foam is made into a volume from the container with a syringe and sucked in 20 mL, and the 20 mL of foam is injected from the upper end opening of the cylindrical portion to measure the measurement target site. Then, 20 mL of 38 ° C. hot water is injected from the upper end opening immediately after the injection of the bubbles. And the time required from immediately after injection of such hot water until a part of the foam covering the measurement target part disappears and a part of the measurement target part can be visually recognized through the cylindrical part The time is taken as the bubble absorption time of the evaluation target.

  In addition, the present invention is used for absorbing hot water used for shampooing, and is disposed at a position facing the skin that is relatively close to the head of the person being washed and a position relatively far from the head when used. And a non-skin facing surface, a top sheet positioned on the skin facing surface side, a back sheet positioned on the non-skin facing surface side, and an absorbent body disposed between the sheets. It is a pad, and provides an absorbent pad for hair washing, wherein the surface sheet contains a silicone-based foam absorbent and a foam absorbent assistant.

  ADVANTAGE OF THE INVENTION According to this invention, the rinsing operation after a shampoo can be performed easily in a comparatively narrow work space, and also the absorption pad for hair washing which can wash away the foam by a shampoo from a to-be-washed person cleanly is provided.

FIG. 1 is a plan view schematically showing an upper surface side, that is, a surface sheet side, of one embodiment of an absorbent pad for hair washing according to the present invention, and is a plan view in an unfolded state in which elastic members of respective portions are extended and expanded in a planar shape. It is. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is an explanatory diagram of a usage state of the hair-washing absorbent pad shown in FIG. 1. FIG. 4 (a) is an explanatory view of a method for measuring the liquid absorption time, and FIG. 4 (b) is an upper end opening of the cylindrical portion immediately after injecting bubbles into the cylindrical portion of the foam injection tool shown in FIG. 4 (a). FIG. 4C is a plan view schematically showing a state in which the measurement target part of the absorption pad is observed from (a state in which the entire measurement target part is covered with bubbles), and FIG. 4C is a state shown in FIG. FIG. 6 is a plan view schematically showing a state after elapse of a predetermined time (a state in which a part of the foam covering the measurement target site has disappeared). FIG. 5A is a cross-sectional view along the thickness direction of the surface sheet, schematically showing a state in which bubbles are formed on the surface sheet when the surface sheet contains only a silicone-based foam absorbent. FIG. 5B is an enlarged cross-sectional view schematically showing a part of the foam film shown in FIG. Fig. 6 is a view corresponding to Fig. 5 (b) in the case where a silicone-based foam absorbent and a foam absorbent aid are contained in the top sheet, and Figs. 6 (a) to 6 (c) are states of foam breakage. FIG.

  Hereinafter, the absorbent pad for hair washing of this invention is demonstrated with reference to drawings based on the preferable embodiment. 1 to 3 show an absorbent pad 1 that is an embodiment of the absorbent pad for washing hair of the present invention. As shown in FIG. 3, the absorbent pad 1 is disposed below the head of the person to be washed (reference numeral 101 in the figure) at the time of washing the person to be washed (reference numeral 100 in the figure) such as a bedridden person, It is a hair washing aid that can be used to absorb hot water used for washing hair, and is a kind of absorbent article. As used herein, “bedbed person” means a person who is resting on a bed such as a bed or a futon laid on the floor. In this “resting state”, the whole body is placed on the bed. It includes the state of lying down, the state where only the upper body is raised on the bed. The term “washed person” used below includes “bedbed person” unless otherwise specified.

  As shown in FIGS. 1 and 2, the absorbent pad 1 is a liquid-permeable surface sheet 2 disposed at a position relatively close to the head of the person to be washed when used, and is relatively far from the head. It has an absorbent main body 5 including a liquid-impermeable rear sheet 3 disposed at a position and an absorbent body 4 disposed between both sheets 2 and 3. The absorptive main body 5 has a vertical direction X corresponding to the height direction of the person to be washed and a horizontal direction Y corresponding to the left-right direction orthogonal to the height direction.

  In the absorbent pad 1, the absorbent main body 5 has a quadrangular shape (square shape) in a plan view as shown in FIG. 1, and the absorber 4 also has a square shape (in a plan view) although the area is smaller than that of the absorbent main body 5. The absorbent main body 5 and the absorbent body 4 are substantially similar to each other. The top sheet 2 forms an upper surface of the absorbent main body 5, that is, a surface (skin-facing surface) that is directed to the head of the person to be washed when used, and the back sheet 3 is a lower surface of the absorbent main body 5, that is, the hair to be washed when used. A surface (non-skin facing surface) opposite to the surface directed toward the person's head is formed.

  In the present specification, the “skin facing surface” is directed to the skin side (head side) of the person to be washed when the absorbent pad is used, that is, when the hair is washed, in the absorbent pad or its constituent member (for example, the surface sheet 2). The surface, i.e., the side that is relatively close to the skin of the person to be washed, and the "non-skin facing surface" is the surface that is directed to the side opposite to the skin side when the absorbent pad is used in the absorbent pad or a component thereof, i.e. The side is relatively far from the skin of the person being washed.

  The top sheet 2 and the back sheet 3 have the same shape and the same size in plan view, each having a larger area than the absorber 4 and extending outward from the peripheral edge 4E of the absorber 4 have. More specifically, the top sheet 2 covers the entire skin facing surface of the absorbent body 4, and further extends outward from the entire periphery 4 </ b> E of the absorbent body 4. The entire surface of the non-skin facing surface is covered and further extended outward from the entire peripheral edge 4E of the absorbent body 4, and the extending portions from the peripheral edge 4E of both sheets 2 and 3 are joined together and integrated. Thus, a flap portion 5F is formed. Such a flap portion 5F that extends from the peripheral edge 4E of the absorbent body 4 is arranged along the peripheral edge 4E of the absorbent body 4 and surrounds the absorbent body 4. The top sheet 2 and the back sheet 3 may be bonded to the absorber 4 with an adhesive.

  In the absorbent pad 1, a pair of leak-proof cuffs 6, 6 standing in the longitudinal direction X of the absorbent main body 5 in an upward direction at the time of use, that is, toward the head of the person being washed, extend in the lateral direction Y. It is arranged in. Each leak-proof cuff 6 is continuous over the entire length in the lateral direction Y of the absorbent pad 1. As shown in FIG. 2, each leak-proof cuff 6 is used for forming a leak-proof cuff including a flap portion 5F (extending portion from the peripheral edge 4E along the lateral direction Y of the absorbent body 4 in the top sheet 2 and the back sheet 3). The sheet 60 includes one or a plurality of (five in the illustrated embodiment) elastic members 61 for forming a leak-proof cuff that are fixed to the flap portion 5F in the lateral direction Y in a stretched state. . The sheet 60 is folded to the surface sheet 2 side by a folding curve (not shown) extending along the peripheral edge 4E along the lateral direction Y of the absorbent body 4, and the surface constituting the portion folded to the surface sheet 2 side of the sheet 60 An elastic member 61 is fixed in an extended state in the lateral direction Y between the sheet 2 and the back sheet 3, and an elastic stretchable part 62 having stretchability in the lateral direction Y is formed. The elastic expansion / contraction part 62 is joined to the surface sheet 2 only at both ends in the lateral direction Y of the sheet 60, and the portions other than the both ends (parts marked with dots in FIG. 1) include the surface sheet 2 and the like. The other components of the absorbent pad 1 are not joined. With the above configuration, when the absorbent pad 1 is used, the contraction force of the elastic member 61 acts in the lateral direction Y, and the leak-proof cuff 6 has a portion other than both ends in the lateral direction Y (the part marked with dots in FIG. 1). 2), as shown in FIG. 2, the free end side stands up toward the wearer's skin (not shown), and the absorbent pad 1 is curved concavely toward the topsheet 2 side. The leak-proof cuffs 6 and 6 may be provided with a separate sheet instead of the top sheet 2, and the elastic member 61 may be sandwiched between the separate sheet and the back sheet 3. Is preferably water-repellent.

  In the absorbent pad 1, the presence of the leak-proof cuff 6 effectively prevents the inconvenience of hot water used for washing the hair leaking out of the absorbent pad 1. In particular, in the present embodiment, as described above, the leak-proof cuff 6 has the folding structure of the flap portion 5F. Therefore, when the absorbent pad 1 is used as shown in FIG. A pocket structure is formed between 62 and the surface sheet 2, and the diffusion of the liquid and the leakage of the liquid to the outside are further effectively suppressed by this pocket structure. Further, the leak-proof cuff 6 has not only such a leak-proof function but also a function of stabilizing the position of the head 101 by supporting the back neck of the hair-washed person 100 from below as shown in FIG. Yes.

About each member of the absorption pad 1, what was conventionally used in the excrement absorption articles | goods, such as a disposable diaper, can be used without a restriction | limiting especially. Examples of the surface sheet 2 include a liquid permeable sheet such as a hydrophilic woven or nonwoven fabric made of synthetic fiber or natural fiber, or a porous sheet. Examples of the back sheet 3 include, as liquid hardly permeable sheets, resin films such as polyethylene films, and nonwoven fabrics such as water-repellent nonwoven fabrics. The term “poor liquid permeability” as used herein includes liquid impermeability that can completely block the permeation of liquid and a property that a small amount of liquid can permeate. A preferable example of the back sheet 3 is a composite sheet in which a resin film and a non-woven fabric are sequentially laminated in order from the head of the person being washed at the time of use. Such a composite sheet is characterized by excellent texture and strength. As the absorber 4, an absorbent core containing a water-absorbing polymer can be used. The absorbent core can include hydrophilic fibers, and the hydrophilic fibers include hydrophilic fibers such as wood pulp, as well as hydrophilic fibers that are inherently hydrophobic fibers. Fiber can also be used. A typical absorbent core is an aggregate of fibrous material that contains small pieces of water-absorbing polymer. The absorbent body 4 may include an absorbent core and a core wrap sheet that covers the absorbent core. As the core wrap sheet, a liquid-permeable sheet that can be used as the top sheet 2 can be used. Typically, paper or non-woven fabric. The basis weight of the absorbent body 4 (the absorbent core) is preferably 200 g / m ² or more, more preferably 300 g / m ² or more, and preferably 600 g / m ² or less, more preferably 500 g / m ² or less. is there.

  One of the main features of the absorbent pad 1 is that the foam absorption time measured by the above method is 30 seconds or less. As is apparent from the measurement method, the foam absorption time is the time required for the absorbent pad to absorb a certain amount of foam applied to the skin facing surface, and the shorter the foam absorption time, It shows excellent foam absorption performance and can absorb bubbles quickly.

  FIG. 4 shows how the bubble absorption time of the absorbent pad 1 is measured by the above method. Reference numeral 20 in FIG. 4 is a bubble. As shown in FIG. 4A, the foam injection tool 10 used for measurement includes a hollow and transparent cylindrical portion 12 having openings 11 at both ends in the axial direction. The cylindrical portion 12 includes annular flange portions 13 extending radially outward at both ends in the axial direction, and the foam injection device 10 is shown in FIG. Thus, the stability when the axial direction of the cylindrical part 12 is made to correspond to a perpendicular direction and it mounts on the skin opposing surface, ie, the surface sheet 2, of the absorption pad 1 improves. Since the cylindrical portion 12 has an inner diameter of 36 mm and a height of 75 mm and is formed of a transparent material, the inside (hollow portion) can be visually recognized from the outside. As a material for forming the cylindrical portion 12, any material may be used as long as it has liquid impermeability and strength necessary for measurement, and has transparency that allows the inside to be visually recognized. Examples thereof include glass and acrylic resin.

  The absorption pad used for the measurement of the bubble absorption time is a rectangular shape in plan view having a length of 50 mm and a width of 50 mm, using a scissor or a cutting machine as a product-type absorption pad. The foam used for the measurement of the bubble absorption time is “foam prepared by a pump dispenser” as described above. This is obtained by discharging the shampoo contained in the pump dispenser container from the pump dispenser container according to a conventional method. Specifically, it is prepared by a commercially available foam discharge type shampoo with a pump dispenser container (trade name “Kid's coming out with merit foam” manufactured by Kao Corporation). When injecting foam and hot water from the upper end opening of the foam injection tool, a commercially available syringe (for example, “Termo Syringe” manufactured by Terumo Corporation) can be used.

  Immediately after injecting the foam 20 into the cylindrical part 12 of the foam injection tool 10, as shown schematically in FIG. 4B, the entire area of the measurement target site 1T surrounded by the cylindrical part 12 in the absorbent pad 1 is the foam 20. It is impossible to visually recognize the measurement target part 1T from the outside through the cylindrical portion 12, but when the measurement target part 1T has a bubble-absorbing function, As a result, the bubble 20 is absorbed into the measurement target site 1T and disappears over time, and as a result, a part of the measurement target site 1T is exposed as schematically shown in FIG. The time required for the exposed portion to appear after pouring hot water into the cylindrical portion 12 is the bubble absorption time of the absorbent pad 1.

  Since the absorbent pad 1 has a foam absorption time of 30 seconds or less, the foaming out is good. Therefore, for example, as shown in FIG. 3, when the absorbent pad 1 is placed under the head of the bedridden and used for washing hair according to a conventional method, bubbles contained in the shampoo washout liquid are absorbed by the absorbent pad 1. Because it is absorbed quickly by the internal absorbent body 4 and does not remain on the top sheet 2, it is difficult for bubbles to remain on the bedside, ears, neck, etc. The discomfort caused by is reduced. In addition, as the use of the absorbent pad 1 makes it difficult for bubbles to remain in the hair of the bedridden person, the “rinse of hair after shampooing is performed multiple times”, which has been performed in the past. "Is unnecessary, so that the hair washing time can be shortened and the working space can be reduced, and the rinsing operation after shampooing can be easily performed in a relatively narrow working space. In addition, according to the absorbent pad 1, a relatively small working space for washing the hair is sufficient, so that the absorbent pad 1 itself is relatively compact in size, which is a manufacturing cost, handling property, and disposal property. This is advantageous. In order to make such an effect more advantageous, the foam absorption time of the absorbent pad 1 is preferably 10 seconds or less.

  It is mainly the topsheet 2 and the absorbent body 4 that give the absorbent pad 1 an excellent foam-absorbing function of “foam-absorbing time of 30 seconds or less”. In particular, the surface sheet 2 contains a silicone-based foam absorbing agent and a foam-absorbing aid, and the surface sheet 2 breaks the foam formed on the skin-facing surface (bubble breakage) or foams with both agents. Can be suppressed (foam suppression). Further, the absorption of the foamed liquid (for example, shampoo washing liquid) that is broken or suppressed by the surface sheet 2 by the absorbent body 4 leads to suppression of the generation of bubbles on the skin facing surface of the surface sheet 2. . That is, the excellent foam absorbing function provided in the absorbent pad 1 is a combination of the foam breaking or foam suppressing function by the silicone-based foam absorbent and foam assisting agent contained in the topsheet 2 and the liquid absorbing function by the absorber 4. It is expressed.

  A combination of a silicone-based foam-absorbing agent and a foam-absorbing aid is important for the development of the foam-absorbing function, particularly the foam breaking or foam-suppressing function. For example, as shown in FIG. 5 (a), when only the silicone foam absorbent 23 is applied to the skin facing surface of the topsheet 2, the foam 20 is formed in the application part of the foam absorbent 23. The droplet of the foam absorbent 23 having a small surface tension enters the foam film 21 forming the foam 20, and the droplet of the foam absorbent 23 that has entered the foam film 21 is shown in FIG. As shown, since it does not enter the gas-liquid interface 22 and remains in the foam film 21 (liquid phase), it does not break.

  On the other hand, when the foaming aid 24 (for example, silica) is further used in addition to the silicone foaming agent 23, the droplets of the foaming agent 23 that have entered the foam film 21, as shown in FIG. Since a large number of foaming aids 24 are attached to the surface, the foaming aids 24 penetrate the gas-liquid interface 22 and further penetrate the gas-liquid interface 22 into the outer gas phase. . Thus, when the foam absorption aid 24 enters the gas phase, the surface tension of the intrusion portion is lower than that of the peripheral portion, and bubbles are broken by the occurrence of such a local surface tension difference.

  In the case where the foaming aid is not a fine particle such as silica but a surfactant, the mechanism of foam breaking is different from the above. That is, for example, in the case where a silicone-based foam absorbent and a surfactant as a foam absorbent aid are applied to the skin facing surface of the topsheet 2, the foam film of the foam absorbent aid is obtained by the action of the surfactant. The dispersibility of the foam-absorbing agent in the (liquid phase) is improved, whereby the elasticity of the foam film is lowered and the foam film becomes unstable, leading to foam breakage.

<Method for confirming presence / absence of silicone-based foam absorbent and foam absorbent assistant>
Whether or not a constituent member of the absorbent article (for example, a non-woven fabric surface sheet) contains a silicone foam absorbent and a foam absorbent assistant is washed by immersing the constituent member in an appropriate solvent. Then, the solvent is volatilized from the washing liquid (the solvent after washing) to obtain a dried product, which can be confirmed by analyzing the dried product by a known method such as chromatography. The contents of the silicone-based foam absorbent and the foam-assisting aid in the constituent member can also be calculated from the amounts of the silicone-based foam absorbent and the foam-assisting aid contained in the product. As the solvent, for example, hexane, methanol, ethanol or the like can be used. When measuring the surface tension, interfacial tension, etc. of a certain substance (substance that seems to be a silicone-based foam absorbent or foam absorbent assistant) taken out from the dried product, if the amount is too small to perform such measurement For this, after selecting an appropriate column and solvent according to the composition of the extracted substance, each component is fractionated by high performance liquid chromatography, and each fraction is further subjected to MS measurement, NMR measurement, elemental analysis, etc. To identify the structure of each fraction. In addition, when it is considered that the silicone-based foam-absorbing agent and the foam-assisting aid contain a polymer compound, it is easier to identify the constituents by using a technique such as gel permeation chromatography (GPC). become.

  In addition, when the component subject to confirmation of the presence or absence of the silicone-based foam absorbent and foam aid is incorporated in the absorbent article as a product and joined to another component, the joint state is released. After taking out the object to be confirmed from the product, the work of confirming the presence or absence of the silicone-based foam absorbent and foam absorbent assistant is performed. For taking out from the product to be confirmed, for example, a cooling means such as cold spray is applied as a joining release means to a joint portion (for example, an adhesive application portion) between the constituent member to be confirmed and another constituent member in the product. Then, the bonding force can be weakened, and then only the confirmation object can be carefully removed. The extraction of the constituent member of the absorbent article can be applied to other evaluation measurements on the constituent member of the absorbent article unless otherwise specified.

  In the present invention, a silicone-based foam absorbent is used as the foam absorbent. Examples of other foam absorbents include hydrocarbon foam absorbents such as glyceryl polypropylene glycol ether, polyoxyethylene polyoxypropylene glycol, polypropylene glycol, etc. Adopted in the present invention because it can provide an excellent foam absorbing function of 30 seconds or less more stably than other foam absorbents, and is chemically inert and has no change in properties other than viscosity. It is a thing. The form of the silicone-based foam absorber is not particularly limited, and can be appropriately selected from an oil type, a solution type, a powder type, an emulsion type, and the like.

  Examples of the silicone-based foam absorber include dimethylpolysiloxane, cyclooctamethyltetrasiloxane, polyester-modified silicone, polyoxyethylene-modified silicone, alkyl-modified silicone, aralkyl-modified silicone, polyether-modified silicone, higher fatty acid-modified silicone, fluoro Examples thereof include silicone, amino-modified silicone, and epoxy-modified silicone, and these can be used alone or in combination of two or more. Among these silicone-based foam absorbers, dimethylpolysiloxane is preferable from the viewpoint of safety.

  Examples of the foaming aid according to the present invention include fine particles and a surfactant, and one of these can be used alone or two or more of them can be used in combination.

  As the fine particles (foaming aid), particles having a particle size smaller than the droplets (oil droplets) formed in the foam film by the silicone-based foaming agent used in combination can be used. Examples thereof include inorganic fine particles such as aluminum, talc and zeolite; organic fine particles such as wax, fatty acid amide and aluminum stearate. In particular, inorganic fine particles are preferably used as a foam-absorbing aid because they improve the foam-absorbing effect in an aqueous foam such as foam produced by shampoo.

  The average particle diameter of the fine particles (foaming aid) is preferably 0.3 μm or more, preferably 25 μm or less, and more preferably 3 μm or less, from the viewpoint of more surely expressing the above-described bubble breaking action. The average particle diameter of the fine particles is measured by the following method.

<Measurement method of average particle diameter>
The average particle size of the fine particles (foaming aid) is measured in accordance with a conventional method using a laser diffraction / scattering particle size distribution measuring device (for example, Horiba, Ltd., device name “Partica LA-950V2”). be able to.
When fine particles (foaming aid) to be measured are attached to a fiber sheet such as a nonwoven fabric, the average particle diameter of the measurement target can be measured by the following method. First, the fiber sheet to which fine particles (foaming aid) are attached is washed by immersing it in an appropriate solvent (for example, hexane), and the washing solution (solvent after washing) is dried to obtain a dried product. Separately, the same solvent (hexane) as the solvent used for cleaning the fiber sheet is placed in the batch cell, and blank measurement is performed using the laser diffraction scattering particle size distribution measuring apparatus. In addition, an appropriate amount of the dried product is added to the same solvent (hexane) used for washing the fiber sheet and mixed uniformly, and the mixture is degassed under reduced pressure at 1 to 10 kPa using a vacuum desiccator. The sample is transferred to a batch cell so as not to enter, and actual measurement is performed using the laser diffraction / scattering particle size distribution measuring apparatus. By subtracting the measurement value in the blank measurement from the measurement value in the actual measurement, the average particle diameter of the target fine particles (foaming aid) is calculated.

  Examples of the surfactant (foaming aid) include anionic surfactants such as polyoxyethylene lauryl ether sodium sulfate and sodium lauryl sulfate; and cationic interfaces such as alkylbenzyldimethylammonium chloride and distearyldimethylammonium chloride. Activators: Nonionic surfactants such as polyoxyethylene stearyl ether, sorbitan stearate, glyceryl stearate and the like. In particular, nonionic surfactants are preferably used as foaming aids because they are excellent in dispersibility of the silicone-based foam absorbent in a foam film (liquid phase) that forms foam and have a high foam breaking effect.

  Moreover, even if the absorbent pad contains the above-described silicone-based foam absorbent and foam-assisting aid, the foam-absorbing function may not be sufficiently exhibited unless the containing site is appropriate. According to the knowledge of the present inventors, when the absorbent body includes an absorbent core and a core wrap sheet that covers the absorbent core, a silicone-based foam absorbent and a foam aid are provided on the core wrap sheet. In the case where both agents are contained in the surface sheet, the foam film, the silicone-based foam absorbent and the foam-assisting aid are more likely to come into contact with each other than in the case where the surface sheet is contained. Based on such knowledge, in the absorbent pad 1, the top sheet 2 contains a silicone-based foam absorbent and a foam-assisting aid.

  Further, from the viewpoint of further improving the foam absorption performance, in particular, from the viewpoint of improving the foam breaking speed, the silicone foam absorbent and the foam absorbent auxiliary are more on the skin facing surface side than on the non-skin facing surface side in the surface sheet 2. It is preferably present (unevenly distributed). As described above, as a method of unevenly distributing the silicone-based foam absorbent and the foam-assisting aid on the skin-facing surface side of the topsheet, the silicone-based foam-absorbing agent and the foam-supporting assistant (for example, both agents) The method of apply | coating a mixture) is mentioned. For the application of both agents, a known coating method can be used as appropriate. The application pattern of the silicone-based foam absorbent and foam absorbent assistant is not particularly limited, and may be a pattern in which a coated portion and a non-coated portion are mixed on one surface of the surface sheet 2, or both agents are coated on the entire surface. It may be a pattern. The uneven distribution state of the silicone-based foam-absorbing agent and the foam-absorbing aid can be confirmed by the following method.

<Confirmation method of uneven distribution of silicone-based foam absorbent and foam absorbent assistant>
A constituent member (for example, a non-woven fabric surface sheet) of the absorbent article to be confirmed is cut into a square shape in plan view of 5 mm × 5 mm to form a measurement sample, and the measurement sample is attached to a sample stage using carbon tape. The sample stage is placed in a scanning electron microscope (S4300SE / N, manufactured by Hitachi, Ltd.) without vapor deposition, and the surrounding environment of the sample stage is set to a low vacuum or vacuum state, and is attached to the scanning electron microscope. Detection is performed according to a conventional method using an annular backscattered electron detector. In an image acquired by detection of such a measurement sample, a substance having a larger atomic number is more likely to emit reflected electrons, and therefore carbon atoms mainly constituting polyethylene (PE), polypropylene (PP), and polyester (PET). The part of the silicone-based foam absorbent or foam-assisting aid that contains a large number of oxygen atoms or silicon atoms having an atomic number larger than that of a hydrogen atom exhibits a white color, and the degree of whiteness depends on the atoms constituting the agent. There is a tendency that the larger the atomic number, or the larger the amount of the agent present in the existing portion, the greater. Therefore, if the degree of whiteness is not uniform in the image obtained by the electron microscope for the measurement sample, it can be determined that the silicone-based foam absorbent and the foam-assisting aid are unevenly distributed in the constituent member. In addition, it can be determined that the silicone-based foam absorbent and the foam-assisting aid are unevenly distributed in the portion where the degree of whiteness is relatively strong.

The content of the silicone-based foam absorber in the top sheet 2 is preferably 0.4 g / m ² or more, more preferably 0.9 g / m ² or more, and preferably 200 g / m ² or less, more preferably 100 g / m ^2. m ² or less.
The content of the foaming aid in the top sheet 2 is preferably 0.1 g / m ² or more, more preferably 0.3 g / m ² or more, and preferably 15 g / m ² or less, more preferably 10 g / m. ² or less.
By making the content of the silicone-based foam absorbent and foam absorbent auxiliary in the surface sheet 2 above this lower limit, the foam-absorbing function can be ensured, and by making this content below this upper limit, It is possible to prevent discomfort such as stickiness due to transfer of the silicone-based foam absorbent and foam absorbent to the head, or to improve foaming during washing.

Moreover, as the surface sheet 2 containing the silicone-based foam absorbing agent and the foam absorption aid, as described above, those conventionally used as the surface sheet in the excreta absorbing article can be used without any particular limitation. Particularly preferred are nonwoven fabrics, particularly spunbond nonwoven fabrics, air-through nonwoven fabrics, point bond nonwoven fabrics, and spunlace nonwoven fabrics. The basis weight of the topsheet 2 in a state in which the silicone-based foam absorbent and foam assistant are not contained is preferably 15 g / m ² or more, more preferably 17 g / m ² or more, and preferably 40 g / m. ² or less, more preferably 36 g / m ² or less.

  Moreover, as a constituent fiber of the nonwoven fabric which comprises the surface sheet 2, although various synthetic fibers (hydrophobic fiber) can also be used as it is, the thing which gave the hydrophilic treatment to the synthetic fiber is preferable. As the fiber hydrophilization treatment, a known treatment can be used without particular limitation, for example, a treatment for attaching a hydrophilizing agent such as a surfactant to the fiber surface, a kneading of the hydrophilizing agent into the fiber, Corona discharge treatment or plasma discharge treatment may be mentioned, and two or more of these may be combined.

  The size of the absorbent pad 1 is not particularly limited and can be arbitrarily set. However, as described above, the absorbent pad 1 has an excellent foam absorbing function, so that the hair after shampooing, like the conventional absorbent pad for hair washing, is used. It is not necessary that the space for rinsing is large enough to secure a plurality of locations, and the space can be made relatively compact. Specifically, in the natural state of the absorbent pad 1, the length in the longitudinal direction X, that is, the length direction of the person to be washed is preferably 200 mm or more, more preferably 250 mm or more, and preferably 650 mm or less, more preferably 600 mm. The length in the horizontal direction Y, that is, the horizontal direction of the person to be washed is preferably 350 mm or more, more preferably 400 mm or more, and preferably 1000 mm or less, more preferably 900 mm or less.

  Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. For example, the planar view shape of the hair-washing absorbent pad of the present invention is not limited to a rectangular shape like the absorbent pad 1 of the above-described embodiment, but in addition to an anisotropic shape such as an elliptical shape, a square shape, a circular shape, etc. An isotropic shape may be used. In addition, from the viewpoint of preventing inconvenience that the liquid once absorbed by the absorbent body 4 flows backward to the topsheet 2 side, a liquid-permeable liquid backflow prevention layer made of a nonwoven fabric or the like is provided between the topsheet 2 and the absorbent body 4. May be interposed.

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

[Examples 1 to 4 and Comparative Examples 1 to 8]
An absorbent pad having the same configuration as the absorbent pad 1 shown in FIGS. 1 and 2 was produced. The length of the produced absorption pad in the vertical direction (height direction of the person to be washed) was 300 mm, and the length in the horizontal direction (left and right direction of the person to be washed) was 760 mm.
A spunbond nonwoven fabric having a basis weight of 18 g / m ² was used as the surface sheet, and each agent was appropriately applied to the skin facing surface of the surface sheet. That is, each agent was unevenly distributed on the skin facing surface side of the topsheet by bringing only the skin facing surface side of the topsheet into contact with a flat surface such as a roll or a flat plate on which each agent was spread uniformly. The type of agent applied to the top sheet, the content (application amount) of the agent in the top sheet, and the like were as follows. In addition, when using 2 or more types of agents, the uniform mixture of the 2 or more types of agents was apply | coated to the surface sheet so that the application quantity of each agent might become the following range.
As the back sheet, a liquid-impermeable polyethylene resin film having a basis weight of 23 g / m ² was used. As the structure of the absorbent body, a structure including an absorbent core and a core wrap sheet covering the absorbent core is adopted, and as the absorbent core, a structure in which a particulate water-absorbing polymer is held in a fiber assembly is used. using an absorbent core comprising a homogenous mixture of a pulp 250 g / ^{m 2} and the water-absorbing polymer particles 100 g / ^{m 2,} as the core wrap sheets using paper having a basis weight of 14 g / ^{m 2.}

Example 1: The type of agent applied to the top sheet was obtained by emulsifying silicone oil, which is a silicone-based foam absorbent, in an O / W type with a nonionic surfactant, which is a foam-absorbing aid (Shin-Etsu Chemical Co., Ltd.) company, product name "KM-72") is one kind, the coating amount of 80.0g ^{/ m} 2.
Example 2: The type of the agent applied to the top sheet is a mixture of silicone oil, which is a silicone-based foam absorbent, and fine powder silica (average particle diameter of 1.8 μm), which is a foam-absorbing aid (fine particles) ( Shin-Etsu Chemical Co., Ltd., product name “KS-66”), and the coating amount is 80.0 g / m ² .
Example 3: The type of agent applied to the top sheet is dimethylpolysiloxane, which is a silicone-based foam absorbent, polyoxyethylene alkyl ether, which is a foam absorbent (surfactant), and foam absorbent (fine particles). 1 type (product name “Antifoam E-20” manufactured by Kao Corporation) blended with fine powder silica (average particle size: 3.0 μm), and the coating amount is 80.0 g / m ² .
Example 4: The type of agent applied to the top sheet is a mixture of a hydrophilic silicone oil that is a silicone-based foam absorber and a hydrocarbon oil that is a foam-absorbing aid (surfactant) (Shin-Etsu Chemical Co., Ltd.) The product name “KS-537” manufactured by Co., Ltd.) is one type, and the coating amount is 80.0 g / m ² .

Comparative Example 1: No foam absorbent and foam aid were applied to the top sheet.
Comparative Example 2: The type of agent applied to the top sheet is one type of dimethylpolysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., product name “KF-96A-100cs”), and the coating amount is 80.0 g / m ^2. .
Comparative Example 3: The type of agent applied to the top sheet is one hydrophilic silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., product name “KS-604”), and the coating amount is 80.0 g / m ² .
Comparative Example 4: The type of agent applied to the top sheet is one type of polyether-modified silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd., product name “KF-6015”), and the coating amount is 80.0 g / m ^2. .
Comparative Example 5: The type of agent applied to the top sheet was dimethylpolysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., product name “KF-96A-100cs”) and polyether-modified silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd.) Product name “KF-6015”), the former coating amount being 40.0 g / m ² and the latter coating amount being 40.0 g / m ² .
Comparative Example 6: The kind of the agent applied to the top sheet is one kind of fine powder silica (average particle diameter 3 μm), and the coating amount is 0.6 g / m ² .
Comparative Example 7: There are two types of agents applied to the top sheet: deionized water and polyoxyethylene (6) stearyl ether (product name “Emulgen 306P” manufactured by Kao Corporation), the former application amount Is 77.0 g / m ² , and the coating amount of the latter is 1.5 g / m ² .
Comparative Example 8: There are two types of agents applied to the surface sheet: nonionic polyether (product name “antifoam no. 1” manufactured by Kao Corporation) and fine powder silica (average particle size 3 μm). The former coating amount is 72.0 g / m ² and the latter coating amount is 8.0 g / m ² .

〔Evaluation test〕
About the absorption pad of each Example and the comparative example, the bubble absorption time was measured by the said method. The results are shown in Table 1 below.

シリコーン系吸泡剤及び吸泡助剤を含む実施例１〜４は、いずれも含まない比較例１、シリコーン系吸泡剤のみを含む比較例２〜５及び吸泡助剤のみを含む比較例６〜７並びに炭化水素系吸泡剤及び吸泡助剤を含む比較例８よりも、吸泡時間が著しく短かった。

Examples 1-4 which contain a silicone type foaming agent and foaming aid are Comparative Example 1 which does not contain any, Comparative Examples 2-5 which contain only silicone type foaming agent, and Comparative Examples which contain only foaming aid The foaming time was significantly shorter than Comparative Example 8 containing 6 to 7 and a hydrocarbon-based foaming agent and a foaming aid.

DESCRIPTION OF SYMBOLS 1 Absorption pad for hair washing 2 Top sheet 3 Back sheet 4 Absorber 5 Absorbent main body 6 Leak-proof cuff 10 Foam injection tool 11 Opening 12 Cylindrical part 13 Flange part 20 Foam 21 Foam film 22 Air-liquid interface 23 Foam absorber 24 Absorption Foaming aid X Longitudinal direction [Height direction of the person to be washed (bedbed person)]
Y lateral direction [left and right direction of the person to be washed (bedbed person)]

Claims (7)

Used for the absorption of hot water used for washing hair, and facing the skin facing away from the head of the person to be washed at the time of use, and facing the non-skin facing away from the head An absorbent pad for shampoo comprising a surface sheet located on the skin-facing surface side, a back sheet located on the non-skin-corresponding surface side, and an absorbent body disposed between both sheets,
An absorbent pad for washing hair, wherein the foam absorption time measured by the following method is 30 seconds or less.
<Measurement method of foam absorption time>
An absorption pad to be evaluated is placed on a horizontal surface with the skin facing surface facing upward, and a transparent cylindrical portion having an inner diameter of 36 mm and having both axial ends open on the skin facing surface of the absorption pad. The foam injection tool provided is placed so that the axial direction of the cylindrical portion coincides with the vertical direction. Thus, in the state where the foam injection tool is placed on the absorbent pad, the measurement target part surrounded by the cylindrical part in the absorbent pad can be visually recognized from the outside through the transparent cylindrical part. From this state, first, the foam prepared by the pump dispenser is put in a container, and the foam is made into a volume from the container with a syringe and sucked in 20 mL, and the 20 mL of foam is injected from the upper end opening of the cylindrical portion to measure the measurement target site. Then, 20 mL of 38 ° C. hot water is injected from the upper end opening immediately after the injection of the bubbles. And the time required from immediately after injection of such hot water until a part of the foam covering the measurement target part disappears and a part of the measurement target part can be visually recognized through the cylindrical part The time is taken as the bubble absorption time of the evaluation target.   The absorbent pad for hair washing according to claim 1, wherein the surface sheet contains a silicone-based foam absorbent and a foam absorbent assistant. Used for the absorption of hot water used for washing hair, and facing the skin facing away from the head of the person to be washed at the time of use, and facing the non-skin facing away from the head An absorbent pad for shampoo comprising a surface sheet located on the skin-facing surface side, a back sheet located on the non-skin-corresponding surface side, and an absorbent body disposed between both sheets,
An absorbent pad for shampooing, wherein the surface sheet contains a silicone-based foam absorbent and a foam absorbent assistant.   The hair-absorbing absorbent pad according to claim 3, wherein the silicone-based foam absorbent is dimethylpolysiloxane.   The hair-absorbing absorbent pad according to any one of claims 2 to 4, comprising one or more selected from the group consisting of fine particles and a surfactant as the foam absorption aid.   The absorbent pad for hair washing according to claim 5, wherein the surfactant is a nonionic surfactant.   The said silicone type foam absorbing agent and the said foam absorption adjuvant exist more in the skin opposing surface side than the non-skin opposing surface side in the said surface sheet, The object for hair washing of any one of Claims 2-6 Absorption pad.

Images