Absorbent material for portable toilets

Abstract

To provide an absorber for simple toilet which can easily adjust an absorption amount, suppress gel blocking of a highly absorbent polymer, easily remove and dispose of an absorbed absorber and which can be used by an unspecified large number of users with good usability.SOLUTION: An absorber for simple toilet includes a plurality of bag bodies having different dimensions. The plurality of bag bodies are stored in a simple toilet by being stacked in the descending order of the dimensions from the upper side to the lower side as laminated bodies that are laminated in the layer shape for each bag body with the same dimension. The absorber for simple toilet includes one or a plurality of hydrophilic nonwoven sheets 30 which are arranged between the laminated body of the bag bodies with one dimension and the laminated body of the bag bodies with the other dimensions. In the bag body, powder of a highly absorbent polymer 62 is sealed in a bag 60 made of the liquid permeable nonwoven fabric.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an absorbent material for portable toilets. [Background technology]

[0002] In the event of a disaster, if flush toilets become unusable due to a water outage, portable toilets are used. Portable toilets primarily use absorbent materials for bodily fluids such as urine, including powdered superabsorbent polymers that absorb excrement and solidify it into a gel, and absorbent sheets made of absorbent materials similar to those found in general absorbent products.

[0003] However, when using the above-mentioned powdered superabsorbent polymer as a bodily fluid absorbent, controlling the amount absorbed is difficult, and there are pros and cons to handling it. Furthermore, while absorbent sheets are easy to handle, there are limitations to adjusting the amount absorbed, making them unsuitable for use by a large number of users. In light of these problems, various proposals have been made.

[0004] Patent Document 1 describes a toilet bowl in which a lump-shaped treatment agent containing an acidic solid substance, a superabsorbent polymer, and a binder, or a granular treatment agent obtained by crushing the same, is pre-placed (claims 1, 8, and 9). According to Patent Document 1, by pre-placing a lump-shaped treatment agent containing an acidic solid substance, a superabsorbent polymer, and a binder in the toilet bowl, it is possible to treat bodily fluids such as urine simply and efficiently without requiring operations such as stirring, and unpleasant odors can be suppressed. Furthermore, since the lump-shaped treatment agent is solidified and no dust is scattered during use, handling is improved. Moreover, in nursing care settings, since no dust is generated, health hazards to the person being cared for, the user, and the caregiver can be suppressed (paragraph 0024).

[0005] Patent Document 2 describes a portable toilet absorbent sheet comprising: a container having an opening that faces upward and for containing the user's excrement; a frame having a toilet seat portion to which the container is detachably attached; and an absorbent sheet for a portable toilet that is attached to the container and is in the form of a rectangular sheet when unfolded, wherein the absorbent sheet comprises a liquid-permeable surface sheet, a liquid-impermeable back sheet, and a rectangular sheet-shaped absorbent body disposed between them, a body fluid absorbent portion contained in the container so as to cover the bottom, a flap portion provided along the outer circumference of the body fluid absorbent portion and having first and second flap portions that are more flexible than the body fluid absorbent portion and located on one side and the other side of the body fluid absorbent portion, and a pair of elastically expandable thread-like members joined to the first flap portion and the second flap portion respectively so as to be parallel to and spaced apart from the two opposing edges of the absorbent body when unfolded (Claim 1). According to Patent Document 2, the aforementioned absorbent sheet for portable toilets can be attached to a container so as to form a wide absorbent surface, allowing for rapid absorption of excrement (paragraph 0011).

[0006] Patent Document 3 describes a disposable, simple toilet storage device comprising (1) folded thick cardboard (2 mm), (2) a powder containing zeolite superabsorbent polymer and boric acid to absorb excrement, sealed inside the thick cardboard, and (3) waterproof paper made of kraft paper laminated with poly, fixed inside the thick cardboard, which can be used as a box-shaped toilet tank by opening the thick cardboard to the left and right, and after use the top opening can be sealed with double-sided tape and disposed of as combustible waste (Claim 1). Patent Document 3 describes a lightweight and simple disposable toilet storage device that can be used for handling excrement, vomiting, etc. in times of disaster, emergency, etc. (Paragraph 0009).

[0007] Patent Document 4 describes an absorbent for an absorbent article, comprising a plurality of bags inside, each bag having a bag body made of a hydrophilic nonwoven fabric and a superabsorbent polymer (hereinafter also referred to as "SAP") sealed inside the bag body, wherein the bag (hereinafter also referred to as "bag") has a length of 30 mm or more and a width of 9 mm or more and 30 mm or less (Claim 1), and an absorbent article (Claim 6) in which this absorbent is arranged between a liquid-permeable top sheet and a liquid-impermeable back sheet. According to Patent Document 4, an absorbent is provided which allows SAP to be freely arranged according to the location and which is less prone to SAP leakage and gel blocking, and an absorbent article equipped with the absorbent. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2017-6913 [Patent Document 2] Patent No. 6817647 [Patent Document 3] Utility Model Registration No. 3107866 [Patent Document 4] Japanese Patent Publication No. 2021-159111 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The prior art described in Patent Documents 1 to 3 each has its own advantages and disadvantages. In particular, as absorbent materials for portable toilets used by an unspecified number of users, it is not easy to adjust the amount of absorption, and they are insufficient in terms of ease of use. Specifically, it is not easy to increase the amount of absorption as needed, and it is difficult for the absorbent material to efficiently absorb excrement. Furthermore, the superabsorbent polymer is prone to gel blocking, and the ease of use in terms of replacing, disposing of, and adding absorbent material is also insufficient.

[0010] Furthermore, Patent Document 4 does not describe using the bag as an absorbent material for portable toilets. Moreover, according to the inventor's research, it has been found that simply laying the bag from Patent Document 4 in layers inside a portable toilet does not provide sufficient absorption efficiency for bodily fluids such as urine, resulting in problems such as bodily fluids accumulating at the bottom of the portable toilet, and as the number of uses increases, the flowability of bodily fluids from the upper layer to the lower layer decreases while some of the bag is not used for bodily fluid absorption, potentially causing some of the bodily fluids to overflow outside the portable toilet. It is presumed that one of the factors causing these problems is that, unlike absorbent articles which use only a small amount of bag, portable toilets use a large number of bags.

[0011] The object of the present invention is to provide an absorbent material for portable toilets that allows for easy adjustment of absorption amount, suppresses gel blocking of superabsorbent polymers, facilitates the removal and disposal of absorbed material, and is user-friendly for a large number of users. [Means for solving the problem]

[0012] The inventors of the present invention have conducted extensive research to solve the above problems and have found that, instead of simply storing a single-size bag as an absorbent material inside a portable toilet as described in Patent Document 4, they have found that by using multiple bags of different sizes, creating layered stacks for each bag of the same size, stacking these from top to bottom in order of increasing bag size, and interposing a hydrophilic nonwoven fabric sheet between the layered stacks of bags of one size and the layered stacks of bags of other sizes, the problems of bodily fluids accumulating at the bottom of the portable toilet or overflowing to the outside of the portable toilet can be solved, and an absorbent material for portable toilets that meets the purpose can be obtained, thus completing the present invention. In other words, the present invention provides the following absorbent material for portable toilets.

[0013] (1) Absorbent material for portable toilets, It includes multiple bags of different dimensions. The aforementioned multiple bags are stacked in layers, with each bag being of the same size, and are stored inside the portable toilet, stacked from top to bottom in order of increasing size. The bag comprises one or more hydrophilic nonwoven fabric sheets, which are disposed between the laminate of the bag of one size and the laminate of the bag of another size. The aforementioned bag is an absorbent material for a portable toilet, in which a powder of a superabsorbent polymer is sealed inside a bag made of a liquid-permeable nonwoven fabric. (2) The absorbent material for a portable toilet according to (1) above, wherein the hydrophilic nonwoven fabric sheet includes a pulp-containing nonwoven fabric sheet. (3) The bag comprises a first bag and a second bag, The first bag has a length of 100 mm or more and 150 mm or less, a width of 90 mm or more and 150 mm or less, and a content of the superabsorbent polymer of 9 g / bag or more and 15 g / bag or less. The second bag has a length of 60 mm or more and 120 mm or less, a width of 45 mm or more and 110 mm or less, and a content of the superabsorbent polymer of 4 g / bag or more and 11 g / bag or less. The stack of the first bag and the stack of the second bag are stacked in this order on top of the portable toilet. The absorbent material for a portable toilet according to (1) or (2) above, comprising a hydrophilic nonwoven fabric sheet disposed between the laminate of the first bag body and the laminate of the second bag body, wherein the hydrophilic nonwoven fabric sheet has slits or openings. (4) The bag body, in addition to the first bag body and the second bag body, has a third bag body placed on the bottom of the portable toilet, the third bag body has a length of 30 mm or more and 80 mm or less, a width of 9 mm or more and 65 mm or less, and a content of the superabsorbent polymer of 0.18 g / bag or more and 6 g / bag or less, and at least one hydrophilic nonwoven fabric sheet is placed between the laminate of the first bag body and the laminate of the second bag body, and between the laminate of the second bag body and the laminate of the third bag body, the hydrophilic nonwoven fabric sheet has slits or openings, the absorbent material for portable toilets according to (1) or (2) above. (5) The apparent area (mm²) of each of the first bag, the second bag, and the third bag, expressed as length × width2 ) is the absorbent material for a simple toilet of the above (4), where the first bag body > the second bag body > the third bag body. (6) The absorbent material for a simple toilet of the above (4) or (5), where the number of each of the first bag body, the second bag body, and the third bag body in the simple toilet is such that the first bag body < the second bag body < the third bag body. (7) The absorbent material for a simple toilet according to any one of the above (1) to (6), where the amount of 0.9% physiological saline absorbed per 1 g of the superabsorbent polymer in the bag body is 30 g or more and 70 g or less. [Effect of the Invention]

[0014] According to the present invention, there is provided an absorbent material for a simple toilet that can easily adjust the absorption amount, suppress gel blocking of the superabsorbent polymer, facilitate removal and disposal of the used absorbent material, and can be used comfortably by an unspecified large number of users. [Brief Description of the Drawings]

[0015] [Figure 1] It is a schematic diagram showing the configuration of a simple toilet in which the absorbent material for a simple toilet according to the present embodiment is laminated and stored. (a) shows a perspective view, and (b) shows a cross-sectional view. [Figure 2] It is a schematic diagram showing the configuration of another form of a simple toilet in which the absorbent material for a simple toilet according to the present embodiment is laminated and stored. (a) shows a perspective view, and (b) shows a cross-sectional view. [Figure 3] It is a plan view schematically showing an embodiment of a hydrophilic nonwoven fabric sheet. [Figure 4] It is a plan view schematically showing another embodiment of a hydrophilic nonwoven fabric sheet. [Figure 5] It is a plan view schematically showing the configuration of the absorbent material for a simple toilet according to the present embodiment. (a) shows a first embodiment, and (b) shows a modified example of the first embodiment. [Modes for Carrying Out the Invention]

[0016] The absorbent material for the portable toilet of this embodiment will be described below with reference to the drawings. Figure 1 shows the portable toilet 50. Figure 2 shows the portable toilet 51. Figures 3 and 4 show the hydrophilic nonwoven fabric sheet 30. Figure 5 shows bags 1, 2, and 3 (Figure 5(a)) and bag 1A (Figure 5(b)). In this specification, bodily fluids refer to liquids expelled from the body, such as urine, blood, and water in loose stools. A portable toilet is a toilet used for handling excretion, vomiting, etc., during disasters or emergencies, and does not have a flushing function.

[0017] <Portable toilet> The portable toilet 50 shown in Figure 1 and the portable toilet 51 shown in Figure 2 have a toilet seat 10 that the user straddles to relieve themselves, and a waste tank 20 provided below the toilet seat 10 to support the toilet seat 10 and to contain bodily fluids, etc. Inside the waste tank 20, as an absorbent material for portable toilets, an upper layer A, which is a stack of multiple first bags 1, a middle layer B, which is a stack of multiple second bags 2, and a lower layer C, which is a stack of multiple third bags 3 are stacked in order from top to bottom, with the dimensions of each bag being in the relationship of first bag 1 > second bag 2 > third bag 3, and hydrophilic nonwoven fabric sheets 30 are placed between the upper layer A and the middle layer B, and between the middle layer B and the lower layer C. In the portable toilet 51 shown in Figure 2, hydrophilic nonwoven fabric sheets 30 are placed not only between the upper layer A and the middle layer B, and between the middle layer B and the lower layer C, but also between the lower layer C and the bottom surface of the septic tank 20.

[0018] The first, second, and third bags 1, 2, and 3 of this embodiment are flat bags of different dimensions, each containing a powder of superabsorbent polymer 62 sealed inside a liquid-permeable nonwoven fabric bag, as described later. Here, different dimensions mean that, in the case of flat bags, the width dimension or the longitudinal dimension is different, preferably both the width dimension and the longitudinal dimension are different. The dimensions of bags 1, 2, and 3 are not particularly limited as long as their respective dimensions are different, but it is preferable to select them appropriately from the range shown in Table 1, for example. In this embodiment, three sizes of bags 1, 2, and 3 are used, but this is not limited to this, and two or four or more sizes of bags may be used. From Table 1, values ​​should be selected so that the length and width do not overlap to form bags 1, 2 or bags 1, 2, and 3. Table 1 below also shows examples of the respective contents of superabsorbent polymer in bags 1, 2, and 3.

[0019] [Table 1]

[0020] (Hydrophilic nonwoven fabric sheet) The hydrophilic nonwoven fabric sheet 30, which is placed between the upper layer A and the middle layer B, between the middle layer B and the lower layer C, and, if necessary, between the lower layer C and the bottom surface of the toilet tank 20, can be any general hydrophilic nonwoven fabric without any particular limitations. By placing the hydrophilic nonwoven fabric sheet 30, the overflow of bodily fluids from the toilet tank 20 and the accumulation of bodily fluids near the bottom of the toilet tank 20 are further suppressed. Specific examples of hydrophilic nonwoven fabrics include, for example, air-through nonwoven fabrics, thermal-bonded nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, and pulp-containing nonwoven fabrics. Hydrophilic nonwoven fabrics can be used individually or in combination of two or more types. These nonwoven fabrics are composed of, for example, one or more types of fibers made from synthetic resins such as polypropylene, polyethylene, and polyester, regenerated fibers such as rayon, and natural fibers such as cotton. Among these, air-through nonwoven fabrics and pulp-containing nonwoven fabrics are preferred from the viewpoint of bodily fluid absorption, strength, flexibility, and moldability. Furthermore, pulp-containing nonwoven fabrics are even more preferred from the viewpoint that even if a large amount of bodily fluid is rapidly discharged, a portion of it will be stored before falling downwards, allowing the second bag 2 and the third bag 3 to smoothly absorb the bodily fluid.

[0021] (Pulp-containing nonwoven fabric) A pulp-containing nonwoven fabric is, for example, one disclosed in U.S. Patent No. 5,284,703, in which a pulp fiber web is laminated to at least one surface of a nonwoven fabric. It comprises a nonwoven fabric and a pulp fiber web laminated to at least one surface of the nonwoven fabric. Among pulp-containing nonwoven fabrics, those formed by water entanglement are preferred. Such a product is, for example, one in which pulp fibers are entangled with water on the surface of a nonwoven fabric, thereby integrating the pulp fiber web to the nonwoven fabric. In this pulp-containing nonwoven fabric, the fibers constituting the nonwoven fabric and the pulp fibers are intertwined on one surface of the nonwoven fabric to form a pulp fiber web, while some of the pulp fibers penetrate the nonwoven fabric in the thickness direction and are exposed on the other surface, resulting in an extremely strong bond between the nonwoven fabric and the pulp fiber web. Examples of pulp fibers include bleached kraft pulp from coniferous trees such as radiata pine, slush pine, southern pine, lodgepole pine, spruce, and Douglas fir. While there are no particular limitations on the nonwoven fabric, from the viewpoint of the overall strength and liquid permeability of the pulp-containing nonwoven fabric, spunbond nonwoven fabrics composed of synthetic resin fibers are preferred, spunbond nonwoven fabrics containing polypropylene fibers as the synthetic resin fibers are more preferred, and spunbond nonwoven fabrics composed of polypropylene fibers are even more preferred. The basis weight of the pulp-containing nonwoven fabric is, for example, 30 g / m² from the viewpoint of the thickness and strength of the product. 2 More than 80g / m 2 Within the following range, 40g / m² 2 More than 60g / m 2 Within the range of 40g / m 2 More than 50g / m 2 The range is as follows:

[0022] According to this embodiment, when using a bag made of hydrophilic nonwoven fabric with superabsorbent polymer powder sealed inside as an absorbent for a portable toilet, instead of using a bag of one size, two or more bags of different sizes are used, stacked according to the same size, and hydrophilic nonwoven fabric sheets are placed between each stack before being placed in the toilet tank (in a preferred embodiment, multiple relatively larger bags are stacked from the top to the bottom of the toilet tank to form the upper layer, and relatively smaller bags are stacked to form the lower layer, and the lower and upper layers are stacked to form a laminated state), problems such as bodily fluids such as urine accumulating at the bottom of the toilet tank and not being absorbed, or some bodily fluids overflowing from the toilet tank are solved. According to this embodiment, it is easier to replace or add bags than with powdered or sheet-type absorbent materials, and since bags of different sizes are stacked from large to small, the retention of bodily fluids is suppressed and absorbed effectively. Furthermore, gel blocking of the superabsorbent polymer, which tends to occur when bags of the same size are laid in the toilet tank, is suppressed, and the overflow of bodily fluids from the toilet tank is also suppressed.

[0023] In preferred embodiment I, the bag comprises a first bag 1 and a second bag 2, wherein the first bag 1 has a longitudinal dimension of 100 mm to 150 mm, a width dimension of 90 mm to 150 mm, and a superabsorbent polymer content of 9 g / bag to 15 g / bag, and the second bag 2 has a longitudinal dimension of 60 mm to 120 mm, a width dimension of 45 mm to 110 mm, and a superabsorbent polymer content of 4 g / bag to 11 g / bag. The first bag 1 is configured such that at least one, preferably both, of its longitudinal dimension and width dimension is larger than that of the second bag 2 within the aforementioned range.

[0024] Furthermore, in Embodiment I, in the toilet tank of the portable toilet, an upper layer, which is a laminate made by stacking multiple first bag bodies 1, and a lower layer, which is a laminate made by stacking multiple second bag bodies 2, are stacked from top to bottom, with a hydrophilic nonwoven fabric sheet 30 interposed between them.

[0025] Furthermore, the hydrophilic nonwoven fabric sheet 30 has slits (not shown) or openings (not shown) that penetrate the sheet in the thickness direction. A slit is a linear opening extending in one direction, and an opening is an opening having a plan view shape such as a square, circle, or triangle. As shown in Figures 4 and 5, the hydrophilic nonwoven fabric sheet 30 has slits (Figure 4) or openings (Figure 5). In Figure 4, a large number of slits that are relatively short in dimension and narrow in width are formed regularly, but the sheet is not limited to this, and a small number of slits that are relatively long in dimension and wide in width may also be provided. The length, width, number, arrangement, etc. of the slits can be appropriately selected from a wide range depending on the type, thickness, strength, and other characteristics of the hydrophilic nonwoven fabric sheet 30. Furthermore, the openings shown in Figure 5 are also small in size compared to the length and width dimensions of the hydrophilic nonwoven sheet 30, and a large number of openings with relatively small opening areas are arranged regularly. However, the planar shape, dimensions, opening area, number of openings, and arrangement of the openings can be appropriately selected according to the aforementioned characteristics of the hydrophilic nonwoven sheet 30, similar to the slits.

[0026] In preferred embodiment II, as shown in Figures 1 and 2, the invention includes a first bag 1, a second bag 2, and a third bag 3. Similar to embodiment I, the first bag 1 has, for example, a longitudinal dimension of 100 mm to 150 mm, a width dimension of 90 mm to 150 mm, and a superabsorbent polymer content of 9 g / bag to 15 g / bag. Similar to embodiment I, the second bag 2 has, for example, a longitudinal dimension of 60 mm to 120 mm, a width dimension of 45 mm to 110 mm, and a superabsorbent polymer content of 4 g / bag to 11 g / bag. The third bag 3 has, for example, a length of 30 mm to 80 mm, a width of 9 mm to 65 mm, and a superabsorbent polymer content of 0.18 g / bag to 6 g / bag.

[0027] In Embodiment II, the first bag body 1 is configured such that at least one of the longitudinal dimension and the width dimension, preferably both, is larger than the second bag body 2 within the aforementioned range. Also, the second bag body 2 is configured such that at least one of the longitudinal dimension and the width dimension, preferably both, is larger than the third bag body within the aforementioned range. In this embodiment, in the toilet bowls 20 of the simple toilets 50 and 51, an upper layer A which is a laminate formed by stacking a plurality of the first bag bodies 1 one on top of the other, a middle layer B which is a laminate formed by stacking a plurality of the second bag bodies 2 one on top of the other, and a lower layer C which is a laminate formed by stacking a plurality of the third bag bodies 3 one on top of the other are laminated in this order. A hydrophilic non-woven fabric sheet 30 is disposed between the upper layer A and the middle layer B and between the middle layer B and the lower layer C, respectively (FIG. 1). In another embodiment, the hydrophilic non-woven fabric sheet 30 is disposed not only between the upper layer A and the middle layer B and between the middle layer B and the lower layer C, but also between the lower layer C and the bottom surface of the toilet bowl 20.

[0028] Furthermore, the hydrophilic non-woven fabric sheet 30 has slits (not shown) or openings (not shown) penetrating the sheet in the thickness direction. The slit is a linear opening extending in one direction, and the opening is an opening having a planar shape such as a square, a circle, or a triangle. When the hydrophilic non-woven fabric sheet 30 has slits and / or openings, as shown in FIGS. 3 and 4 and described above, the length dimension, width dimension, number, arrangement, etc. of the slits, and the planar shape, dimension, opening area, number of openings, arrangement, etc. of the openings can be appropriately selected from a wide range.

[0029] In Embodiment I, the apparent area (mm 2 ) represented by the length × width per one of the first bag body 1 and the second bag body 2 is preferably such that the first bag body 1 > the second bag body 2. Also, in Embodiment II, the apparent area (mm 2Preferably, the order of the bags is first bag 1 > second bag 2 > third bag 3. The same applies when there are four or more types of bags. With this configuration, the absorption of bodily fluids by each bag is improved, and the permeability of bodily fluids from the upper layer A to the lower layer C is improved, significantly suppressing the overflow of bodily fluids outside the septic tank 20 and the accumulation of bodily fluids at the bottom of the septic tank 20.

[0030] In Embodiment I, it is preferable that the number of first bag 1 and second bag 2 stacked and stored in the toilet tank 20 of the portable toilet is such that first bag 1 < second bag 2. In Embodiment II, it is preferable that the number of first bag 1, second bag 2, and third bag 3 stacked and stored in the toilet tank 20 of the portable toilets 50 and 51 is such that first bag 1 < second bag 2 < third bag 3. With these configurations, the absorption of bodily fluids by each bag is improved, and the permeability of bodily fluids from the upper layer to the lower layer is improved, significantly suppressing the overflow of bodily fluids outside the toilet tank and the accumulation of bodily fluids at the bottom of the toilet tank.

[0031] In the embodiments described above, it is preferable that the absorption amount of 0.9% physiological saline solution per gram of superabsorbent polymer in the bag is 30 g to 70 g. With this configuration, the permeability and flowability of bodily fluids to the bag are increased, preventing them from accumulating in the upper layer and overflowing outside the toilet tank even when they are discharged. Furthermore, since bodily fluids are gradually absorbed into the bag from the upper layer to the lower layer, bodily fluids do not accumulate at the bottom of the toilet tank. In addition, it prevents one bag from sticking to surrounding bags through the hydrophilic nonwoven fabric, making it easier to replace the bags. If the absorption amount is less than 30 g, although the deodorizing power is improved, there is a tendency for bodily fluids to accumulate in the lower layer of the toilet tank. If it exceeds 70 g, the bags in the upper layer of the toilet tank partially stick together through the hydrophilic nonwoven fabric, reducing the property of bodily fluids to permeate the bag, and there is a tendency for bodily fluids to overflow outside the toilet tank.

[0032] <Bag body> The specific structure of the bag will be described below with reference to Figure 5. As mentioned above, the bag is a bag in which a superabsorbent polymer is sealed inside a bag made of hydrophilic nonwoven fabric.

[0033] The first, second, and third bags 1, 2, and 3 shown in Figure 5(a) each contain a bag 60 made of a hydrophilic nonwoven fabric having a flattened three-dimensional shape, and a particulate superabsorbent polymer 62 sealed inside the bag 60 made of hydrophilic nonwoven fabric. The first, second, and third bags 1, 2, and 3 are manufactured, for example, by folding the edges of a roughly rectangular hydrophilic nonwoven fabric in half in the width (short side) direction and overlapping them, filling the inside with superabsorbent polymer 62, and forming a seal layer 61 by bonding a predetermined width area from the overlapped edges, thereby sealing the superabsorbent polymer 62 inside. The seal layer 61 can be formed, for example, by heat sealing, ultrasonic welding, or bonding using a hot melt adhesive. In Figure 3(a), the first, second, and third bags 1, 2, and 3 are shown as having the same dimensions for convenience because they have roughly the same shape, but as mentioned above, their actual dimensions are different.

[0034] The first, second, and third bags 1, 2, and 3 are as shown in Figure 5(a), with the long side dimension b( Long side The directional dimensions are as follows: the first bag 1 is in the range of 100 mm to 150 mm, the second bag 2 is in the range of 60 mm to 120 mm, and the third bag 3 is in the range of 30 mm to 80 mm, and the dimension of the shorter side a( width The directional dimensions are as follows: the first bag 1 is in the range of 90 mm to 150 mm, the second bag 2 is in the range of 45 mm to 110 mm, and the third bag 3 is in the range of 9 mm to 65 mm. Furthermore, the thickness of the first, second, and third bags 1, 2, and 3 is not particularly limited, but from the viewpoint of improving the permeability and fluid flow of body fluids to the bags, the thickness of all three bags 1, 2, and 3 is, for example, in the range of 1.0 mm to 4.0 mm.

[0035] Here, regarding dimensions, when the order is first bag 1 > second bag 2 > third bag 3, it is preferable that the dimensional difference between the first bag 1 and the second bag 2 is, for example, in the range of 30 mm to 80 mm for dimension a (width dimension) and 30 mm to 80 mm for dimension b (longitudinal dimension), and that the dimensional difference between the second bag 2 and the third bag 3 is, for example, in the range of 40 mm to 70 mm for dimension a (width dimension) and 15 mm to 80 mm for dimension b (longitudinal dimension). According to this embodiment, differences in body fluid absorption, body fluid retention, and body fluid permeability are created due to the dimensional differences, so that a portion of the body fluid is smoothly absorbed and retained in the first bag 1 which is laminated in the upper layer, another portion of the body fluid is picked up and absorbed and retained in the second bag 2 which is laminated in the middle layer, and the remaining portion of the body fluid is finely captured and absorbed and retained in the third bag 3 which is laminated in the lower layer. As a result, the amount of bodily fluid absorbed and retained by the first bag 1 increases, and the bodily fluid absorption and retention capacity of the portable toilet can be maintained mainly by replacing the first bag 1. Furthermore, overflow of bodily fluids to the outside of the septic tank and accumulation of unabsorbed bodily fluids at the bottom of the septic tank are significantly suppressed.

[0036] As described above, the first, second, and third bags 1, 2, and 3 are constructed by sealing a highly absorbent polymer 62 into a bag 60 made of hydrophilic nonwoven fabric, making them thin, lightweight, and capable of absorbing bodily fluids from all directions, thus functioning as absorbent materials for portable toilets. The first, second, and third bags 1, 2, and 3 do not leak SAP from the bag 60 before use, and since each bag is a standalone entity, they are easy to stack and place in the toilet tank. Furthermore, because the first, second, and third bags 1, 2, and 3 can absorb bodily fluids from all directions, stacking a predetermined number of them can absorb and retain a relatively large amount of bodily fluids.

[0037] The hydrophilic nonwoven fabric constituting the bag 60 is not particularly limited, and examples include air-through nonwoven fabric, thermal-bonded nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and pulp-containing nonwoven fabric. These nonwoven fabrics are composed of one or more types of materials, such as fibers made from synthetic resins like polypropylene, polyethylene, and polyester, regenerated fibers like rayon, and natural fibers like cotton. Among these, air-through nonwoven fabric and pulp-containing nonwoven fabric are preferred from the viewpoint of body fluid absorption, strength, flexibility, and moldability.

[0038] The superabsorbent polymer 62 sealed in the bag 60 can be any polymer capable of absorbing bodily fluids and preventing backflow, without any particular limitations. Examples include polyacrylates, polyaspartates, (starch-acrylic acid) graft copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers, and their saponified products. Among these, polyacrylates are preferred from the viewpoint of the amount of bodily fluid absorbed per unit weight, and sodium polyacrylate is more preferred. SAP can be used alone or in combination of two or more types. Various commercially available products can be used as the superabsorbent polymer 62 without any particular limitations.

[0039] One embodiment of the first, second, and third bags 1, 2, and 3 is one in which the superabsorbent polymer 62 is sealed directly inside the bag 60. Another embodiment of the first, second, and third bags 1, 2, and 3 is one in which the superabsorbent polymer 62 is wrapped in a carrier sheet such as tissue, absorbent paper, or airlaid nonwoven fabric and then sealed inside the bag 60. In this case, the superabsorbent polymer 62 may be fixed to the surface of the carrier sheet with double-sided tape or adhesive. It is also preferable that the superabsorbent polymer 62 be sealed inside the bag 60 in particulate form. The particle size of the superabsorbent polymer 62 is not particularly limited, but for example, the median particle size is in the range of 50 μm to 600 μm. Alternatively, multiple layers of the first, second, and third bags 1, 2, and 3 may be attached to both sides of a carrier sheet, and these layers may be stacked to form the upper layer A, middle layer B, and lower layer C described above.

[0040] The amount of superabsorbent polymer 62 enclosed in each of the first, second, and third bags 1, 2, and 3 is, for example, in the range of 9g to 15g, 4g to 11g, and 0.18g to 6g, respectively. If the amount of superabsorbent polymer 62 enclosed is within the above range, the mechanism of absorbing a portion of the bodily fluid from the upper layer to the lower layer, holding the other parts, and transferring the remainder to the lower layer proceeds smoothly, and the overflow of bodily fluids outside the toilet tank and the accumulation of bodily fluids at the bottom of the toilet tank are significantly suppressed. If the amount of superabsorbent polymer 62 enclosed in the first, second, and third bags 1, 2, and 3 is less than the lower limit and / or exceeds the upper limit mentioned above, the balance of the mechanism of absorbing a portion of the bodily fluid from the upper layer to the lower layer, holding the other parts, and transferring the remainder to the lower layer is disrupted, and there is a tendency for the overflow of bodily fluids outside the toilet tank and the accumulation of bodily fluids at the bottom of the toilet tank to occur more easily.

[0041] The bag 1A shown in Figure 5(b) is a modified version of the first, second, and third bags 1, 2, and 3. Bag 1A has the same configuration as the first, second, and third bags 1, 2, and 3, except that instead of a seal layer 61, seal layers 61 and non-seal layers 63 are formed alternately in the circumferential direction. The non-seal layer 63 is the region where the hydrophilic nonwoven fabrics on both sides are not adhered, and the internal and external spaces of bag 1A are in communication via the non-seal layer 63. The circumferential width of the non-seal layer 63 should be such that the superabsorbent polymer 62 inside does not leak out of bag 1A. Since bags 1 and 2 are thin and folded into a nearly flat shape, leakage of the superabsorbent polymer 62 to the outside is unlikely even if multiple non-seal layers 63 are present. By configuring bag 1A in this way, bodily fluids are introduced into bag 1A more uniformly from all directions, further reducing the possibility of gel blocking.

[0042] Furthermore, considering the ease of stacking, etc., bags (not shown) having three-dimensional shapes such as cylindrical, triangular prism, square prism, and hexagonal prism may be constructed. For example, a cylindrical bag may be constructed in accordance with the first, second, and third flattened bags 1, 2, and 3, with the height of the cylinder as the longitudinal dimension and the diameter of the circle at the base of the cylinder as the width dimension. Similarly, a polygonal prism bag may be constructed in accordance with the first, second, and third flattened bags 1, 2, and 3, with the height of the prism as the longitudinal dimension and the diameter of the smallest circle inscribed in the polygon at the base of the prism as the width dimension.

[0043] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments, and it will be clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. Furthermore, it is clear from the claims that embodiments with such modifications or improvements may also be included in the technical scope of the present invention. [Explanation of symbols]

[0044] 1. First sac 2. Second sac 3. Third sac 1A bag body 10 Toilet Seats 20 toilet tank 30 Hydrophilic nonwoven fabric sheet 60 bags 61 sealing layer 62 Superabsorbent Polymers 63 Non-sealing layer

Claims

1. It is an absorbent material for portable toilets, It includes multiple bags of different dimensions. The aforementioned multiple bags are stacked in layers, with each bag being of the same size, and are stored inside the portable toilet, stacked from top to bottom in order of increasing size. The bag comprises one or more hydrophilic nonwoven fabric sheets, which are disposed between the laminate of the bag of one size and the laminate of the bag of another size. The aforementioned bag is an absorbent material for a portable toilet, in which a powder of a superabsorbent polymer is sealed inside a bag made of a liquid-permeable nonwoven fabric.

2. The absorbent material for a portable toilet according to claim 1, wherein the hydrophilic nonwoven fabric sheet includes a pulp-containing nonwoven fabric sheet.

3. The bag comprises a first bag and a second bag. The first bag has a length of 100 mm or more and 150 mm or less, a width of 90 mm or more and 150 mm or less, and a content of the superabsorbent polymer of 9 g / bag or more and 15 g / bag or less. The second bag has a length of 60 mm or more and 120 mm or less, a width of 45 mm or more and 110 mm or less, and a content of the superabsorbent polymer of 4 g / bag or more and 11 g / bag or less. The stack of the first bag and the stack of the second bag are stacked in this order on top of the portable toilet. The absorbent material for a portable toilet according to claim 1 or claim 2, comprising a hydrophilic nonwoven fabric sheet disposed between the laminate of the first bag body and the laminate of the second bag body, wherein the hydrophilic nonwoven fabric sheet has slits or openings.

4. The bag body, in addition to the first bag body and the second bag body, has a third bag body placed on the bottom of the portable toilet, the third bag body having a length of 30 mm or more and 80 mm or less, a width of 9 mm or more and 65 mm or less, and a content of the superabsorbent polymer of 0.18 g / bag or more and 6 g / bag or less, and at least one hydrophilic nonwoven fabric sheet is placed between the laminate of the first bag body and the laminate of the second bag body, and between the laminate of the second bag body and the laminate of the third bag body, the hydrophilic nonwoven fabric sheet has slits or openings, as described in claim 1 or claim 2.

5. The apparent area (mm²) of each of the first bag, the second bag, and the third bag, expressed as length × width. ２ The absorbent material for a portable toilet according to claim 4, wherein the order of the bags is: first bag > second bag > third bag.

6. The absorbent material for a portable toilet according to claim 4 or claim 5, wherein the number of each of the first bag, the second bag, and the third bag in the portable toilet is such that the first bag < the second bag < the third bag.

7. The absorbent material for a portable toilet according to any one of claims 1 to 6, wherein the amount of 0.9% physiological saline absorbed per gram of superabsorbent polymer in the bag is 30 g or more and 70 g or less.

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