Water absorption sheet and urine isolation pad

Abstract

The utility model discloses a water absorption sheet and a urine isolation pad, the water absorption sheet comprises an outer surface compact layer, a middle gradient transition layer and a bottom loose layer, the outer surface compact layer, the middle gradient transition layer and the bottom loose layer are connected in sequence, a plurality of first water absorption holes, a plurality of second water absorption holes and a plurality of third water absorption holes are uniformly distributed in the first water absorption holes, the second water absorption holes and the third water absorption holes, and the apertures of the first water absorption holes, the second water absorption holes and the third water absorption holes are sequentially increased; according to the scheme, through the design of the multi-layer gradient pores, the good air permeability can be considered while the flow guide efficiency is guaranteed, and a healthier environment is provided for the skin of the old people. The problems that in the prior art, a urine isolation pad is insufficient in air permeability, skin is prone to being moist, and liquid is prone to being concentrated in a local area to cause leakage or reverse osmosis are solved.

Description

Technical Field

[0001] This utility model relates to the field of hygiene care products technology, specifically to an absorbent sheet and a diaper pad. Background Technology

[0002] With the aging population, the care needs of elderly people who are bedridden for extended periods are increasing, with incontinence care being a key issue. Waterproof pads, as essential care products, must possess functions such as high absorbency, leak prevention, and antibacterial properties to prevent skin infections and bedsores.

[0003] CN219461610U discloses an adult incontinence pad with antibacterial function, comprising a breathable mesh fabric, a layer of cotton floss fixedly connected directly beneath the breathable mesh fabric, a permeable layer fixedly connected directly beneath the cotton floss, a layer of cotton linen fixedly connected directly beneath the permeable layer, an absorbent layer fixedly connected directly beneath the cotton linen, a waterproof layer fixedly connected directly beneath the absorbent layer, a non-woven fabric fixedly connected directly beneath the waterproof layer, an antibacterial layer fixedly connected directly beneath the non-woven fabric, and a PE bottom film fixedly connected directly beneath the antibacterial layer. Elastic bands are fixedly connected to the four corners of the bottom of the PE bottom film. This incontinence pad, through its multi-layered structure including breathable mesh fabric, cotton floss, a permeable layer, cotton linen, an absorbent layer, a waterproof layer, a non-woven fabric, an antibacterial layer, and a PE bottom film, significantly improves its absorbency and antibacterial effect.

[0004] However, existing diaper pads use a fully enclosed leak-proof layer design, which enhances absorbency and antibacterial properties through a multi-layer structure. While this method can effectively prevent liquid leakage, it also restricts air circulation and results in insufficient breathability, which can easily lead to damp skin and subsequently cause pressure sores or infections. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an absorbent sheet and a diaper pad to solve the problem that the existing diaper pads have insufficient breathability, which easily leads to skin dampness and thus causes pressure sores or infections.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a water-absorbing sheet, comprising a dense outer layer, a middle gradient transition layer, and a loose bottom layer, wherein the dense outer layer, the middle gradient transition layer, and the loose bottom layer are connected in sequence and each has a plurality of first water-absorbing holes, a plurality of second water-absorbing holes, and a plurality of third water-absorbing holes evenly distributed thereon, wherein the pore size of the first water-absorbing holes, the second water-absorbing holes, and the third water-absorbing holes increases in sequence.

[0008] In some embodiments, the pore size of the first water absorption hole is 10–30 μm.

[0009] In some embodiments, the pore size of the second water absorption hole is 50–100 μm.

[0010] In some embodiments, the diameter of the third water-absorbing hole is 150–300 μm.

[0011] In some embodiments, the outer dense layer, the intermediate gradient transition layer, and the bottom loose layer are all nonwoven fabric layers.

[0012] In some embodiments, the nonwoven layer is formed by interweaving PLA fiber layer, bamboo charcoal viscose fiber layer and alginate fiber layer.

[0013] In some embodiments, the absorbent sheet further includes an antibacterial functional layer bonded to the outer dense layer, the antibacterial functional layer being composed of nanoscale inorganic particles.

[0014] In some embodiments, the absorbent pad further includes aloe vera extract microcapsules disposed in the first absorbent hole.

[0015] In some embodiments, the aloe vera extract microcapsules have a particle size of 5–10 μm.

[0016] Secondly, this utility model provides a diaper pad, including the absorbent sheet as described in any of the above.

[0017] Compared with existing technologies, the absorbent pad and diaper pad provided by this utility model adopt a multi-layer gradient pore structure design. The outer dense layer can quickly absorb and lock in liquid, reducing liquid residue and preventing leakage or backflow. The middle gradient transition layer is used to accelerate the longitudinal flow of liquid, guiding the liquid to quickly penetrate to the bottom loose layer. The bottom loose layer has a larger pore size and gaps, which can hold more liquid and maintain good breathability, effectively preventing skin dampness and reducing the occurrence of pressure sores or infections. Through this multi-layer gradient pore design, the diaper pad can ensure efficient drainage while maintaining good breathability, providing a healthier environment for the skin of the elderly. It solves the problems of insufficient breathability, easy skin dampness, and liquid concentration in local areas leading to leakage or backflow in existing diaper pads. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the absorbent sheet provided in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the diaper pad provided in this embodiment of the utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Absorbent sheet; 11. Dense outer layer; 12. Gradient transition layer in the middle; 13. Loose bottom layer;

[0022] 2. Absorbent layer; 3. Waterproof layer; 4. Backing layer. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] To address the technical problems of insufficient breathability in diapers, which can easily lead to damp skin, pressure sores, infections, and leakage or backflow, this invention provides an absorbent sheet and diaper pad. Through a multi-layered gradient pore design, it ensures efficient drainage while maintaining good breathability, providing a healthier environment for the skin of the elderly. This solves the problems of insufficient breathability, damp skin, and leakage or backflow caused by liquid concentration in existing diaper pads.

[0025] It should be noted that the absorbent sheet described in this utility model is used for, but not limited to, diaper pads. For ease of explanation, this utility model only uses the application of the absorbent sheet in diaper pads as an example. The principle of the absorbent sheet in other types of absorbent products is essentially the same as that in diaper pads, and will not be described in detail here.

[0026] Please see Figure 1 In a first aspect, embodiments of this application provide a water-absorbing sheet 1, including an outer dense layer 11, an intermediate gradient transition layer 12 and a bottom loose layer 13. The outer dense layer 11, the intermediate gradient transition layer 12 and the bottom loose layer 13 are connected in sequence and each has a plurality of first water-absorbing holes, a plurality of second water-absorbing holes and a plurality of third water-absorbing holes evenly distributed thereon. The pore sizes of the first water-absorbing holes, the second water-absorbing holes and the third water-absorbing holes increase in sequence.

[0027] In this design, a dense outer layer 11, a gradient transition layer 12, and a loose bottom layer 13 are used. The first absorbent pores distributed in the dense outer layer 11 have the smallest pore size, ensuring that they can quickly absorb and lock in liquid, effectively preventing liquid backflow, reducing residue, and keeping the surface dry. The pore size of the gradient transition layer 12 is larger than that of the dense outer layer 11, which helps the liquid to flow rapidly in the longitudinal direction, quickly transferring the absorbed liquid to the bottom loose layer, thereby improving the absorbency. The pore size of the loose bottom layer 13 is larger than that of the gradient transition layer 12, which can further accelerate the diffusion and storage speed of the liquid, thereby significantly improving its breathability and ensuring the long-lasting effect of the absorbent sheet 1.

[0028] Preferably, in this embodiment, the outer dense layer has a pore size of 10–30 μm and a smooth surface is formed through hot rolling to reduce liquid residue; the middle gradient transition layer has a pore size of 50–100 μm to accelerate longitudinal liquid flow; and the bottom loose layer has a pore size of 150–300 μm to improve breathability, with a breathability rate ≥6000 g / m² / 24h. Thus, both flow efficiency and breathability are achieved, reducing skin moisture.

[0029] In some possible embodiments, the outer dense layer 11, the intermediate gradient transition layer 12, and the bottom loose layer 13 are all made of nonwoven fabric, wherein the multi-layered gradient porous structure is formed by air-flow web formation and hydroentangling reinforcement. The fiber mass percentage of the nonwoven fabric is PLA 50%–70%, bamboo charcoal viscose 20%–30%, and alginate 10%–20%. The surface of the nonwoven fabric is also plasma treated to form a micro-nano rough structure, which enhances hydrophobicity, has a contact angle ≥130°, and prevents liquid adhesion.

[0030] Furthermore, in some possible embodiments, the nonwoven layer is composed of a PLA fiber layer, a bamboo charcoal viscose fiber layer, and an alginate fiber layer mixed in a specific ratio. PLA fiber, as a biodegradable material, helps reduce the environmental burden; bamboo charcoal viscose fiber naturally possesses antibacterial and odor-absorbing properties; and alginate fiber releases calcium ions upon contact with liquid, forming a gel barrier to prevent backflow. With excellent environmental performance, the nonwoven layer's main component, PLA fiber, is biodegradable, achieving a degradation rate of up to 68% in 180 days, significantly reducing the burden of waste disposal and contributing to environmental protection.

[0031] In some possible embodiments, the absorbent sheet 1 further includes an antibacterial functional layer and aloe vera extract microcapsules bonded to the outer dense layer 11, the antibacterial functional layer being composed of nanoscale inorganic particles. The aloe vera extract microcapsules are embedded within the first absorbent pores of the outer dense layer 11.

[0032] In one embodiment, the nano-sized inorganic particles are nano-zinc oxide. By immersing nonwoven fabric in a dispersion of nano-zinc oxide and then drying it, an antibacterial layer is formed on the fiber surface. The nano-zinc oxide particles have a diameter ≤50nm and a concentration of 1%–3%, capable of long-term inhibition of the growth of bacteria such as Escherichia coli and Staphylococcus aureus, with an antibacterial rate ≥99%. The aloe vera extract microcapsules have a particle size of 5–10μm and are embedded within the fibers. Upon contact with the skin, they are slowly released, effectively reducing irritation caused by friction. Thus, multiple functions such as biodegradability, antibacterial properties, and anti-backflow properties can be synergistically achieved.

[0033] It should be noted that, in other possible embodiments, the outer dense layer 11, the intermediate gradient transition layer 12, and the bottom loose layer 13 are not limited to being made of non-woven fabric materials, but can also be other materials with water-absorbing properties, such as superabsorbent polymers, cellulose fibers, etc. The selection of these materials can be flexibly adjusted according to the needs of specific application scenarios, and the material can form a multi-layered gradient pore structure. Furthermore, the formation process of the multi-layered gradient pore structure is not limited to air-laid web forming + hydroentangling reinforcement; other suitable processes, such as needle punching and hot pressing, can also be used to meet different production needs. In addition, the selection of nano-sized inorganic particles is not limited to nano-zinc oxide; other nanomaterials with antibacterial properties can also be used, as long as an effective antibacterial layer can be formed on the fiber surface.

[0034] The preparation process of the nonwoven fabric layer involves the following steps: First, PLA fibers, bamboo charcoal viscose fibers, and alginate fibers are mixed in a specific ratio and then opened and combed to form a web structure; next, a structure with multi-layered gradient pores is constructed by combining air-flow web forming and hydroentangling reinforcement processes; then, the fibers are impregnated in a nano zinc oxide dispersion and dried to form an antibacterial layer on the fiber surface; finally, aloe vera microcapsules are sprayed onto the surface of the nonwoven fabric and subjected to low-temperature hot pressing treatment to firmly embed the microcapsules into the fiber gaps.

[0035] Please see Figure 1 and Figure 2 Secondly, embodiments of this application provide a diaper pad, including the absorbent sheet 1 as provided in any of the above embodiments. The diaper pad also includes an absorbent layer 2, a waterproof layer 3, and a backing layer 4. The absorbent layer is made of absorbent cotton, which effectively absorbs urine; the waterproof layer 3 is made of polyurethane, possessing excellent waterproof performance, anti-mildew ability, good breathability, and excellent recyclability; the backing layer 4 is a breathable microporous membrane.

[0036] In one embodiment, the diaper pad includes an absorbent sheet 1, an absorbent layer 2, a waterproof layer 3, and a backing layer 4. The absorbent sheet 1 is made of non-woven fabric and adopts a multi-layer gradient pore structure. The outermost layer is a dense layer with a pore size of 10-30 micrometers, which is formed into a smooth surface through a hot rolling process to reduce liquid residue. The middle layer is an intermediate gradient transition layer 12 with a pore size of 50-100 micrometers, which can accelerate the longitudinal flow of liquid. The bottom layer is a loose bottom layer 13 with a pore size of 150-300 micrometers and an air permeability of not less than 6000 g / m² / 24 hours, which can improve breathability.

[0037] The absorbent pad 1 is composed of 60% biodegradable polylactic acid (PLA) fiber, 25% natural antibacterial and odor-absorbing bamboo charcoal viscose fiber, and 15% alginate fiber. The surface of the absorbent pad 1 is loaded with nano-zinc oxide particles, with a particle size not exceeding 50 nanometers and a concentration of 1%–3%, which have a long-lasting inhibitory effect on bacteria such as Escherichia coli and Staphylococcus aureus, with an antibacterial rate of not less than 99%. The absorbent pad 1 also contains aloe vera extract microcapsules, with a particle size of 5–10 micrometers, embedded within the fibers, which are slowly released upon contact with the skin to reduce friction and irritation.

[0038] The surface of absorbent sheet 1 is plasma-treated to form a micro-nano rough structure, enhancing its hydrophobic properties and ensuring a contact angle of not less than 130 degrees to prevent liquid adhesion. The preparation process of absorbent sheet 1 includes: mixing polylactic acid (PLA) fibers, bamboo charcoal viscose fibers, and alginate fibers in a specific ratio, and then opening and combing them to form a mesh structure; next, using airflow web forming and hydroentangling reinforcement techniques, constructing a structure with multi-layered gradient pores; then, impregnating the fibers in a dispersion of nano-zinc oxide, drying it to form an antibacterial layer on the fiber surface; finally, spraying aloe vera microcapsules onto the fiber surface, and then using low-temperature hot pressing to firmly embed the microcapsules into the fiber gaps.

[0039] In another embodiment, the diaper pad includes an absorbent sheet 1, an absorbent layer 2, a waterproof layer 3, and a backing layer 4. The absorbent sheet 1 is made of non-woven fabric with a multi-layer gradient pore structure. The outermost layer is a dense layer with a pore size of 15-25 micrometers, which is formed into a smooth surface through a hot rolling process to reduce liquid residue. The middle layer is an intermediate gradient transition layer 12 with a pore size of 60-90 micrometers, which can accelerate the longitudinal flow of liquid. The bottom layer is a loose bottom layer 13 with a pore size of 180-280 micrometers and an air permeability of 6500-7500 g / m² / 24h, which can improve breathability.

[0040] The absorbent pad 1 is composed of 65% biodegradable polylactic acid (PLA) fiber, 20% natural antibacterial and odor-absorbing bamboo charcoal viscose fiber, and 15% alginate fiber. The surface of the absorbent pad 1 is loaded with nano-zinc oxide particles, with a particle size of 20-40 nanometers and a concentration of 2%, which have a long-lasting inhibitory effect on bacteria such as Escherichia coli and Staphylococcus aureus, with an antibacterial rate as high as 99.8%. The absorbent pad 1 also contains aloe vera extract microcapsules, with a particle size of 6-8 micrometers, embedded within the fibers, which are slowly released upon contact with the skin to reduce friction and irritation.

[0041] The surface of the absorbent sheet 1 is plasma-treated to form a micro-nano rough structure, enhancing its hydrophobic properties and providing a contact angle of 135–145 degrees to prevent liquid adhesion. The preparation process of the absorbent sheet 1 includes: mixing polylactic acid (PLA) fibers, bamboo charcoal viscose fibers, and alginate fibers in a specific ratio, and then opening and combing them to form a mesh structure; next, using airflow web forming and hydroentangling reinforcement techniques, a structure with multi-layered gradient pores is constructed; then, the fibers are impregnated in a dispersion of nano-zinc oxide, dried, and an antibacterial layer is formed on the fiber surface; finally, aloe vera microcapsules are sprayed onto the fiber surface and fixed by low-temperature hot pressing, allowing the microcapsules to be firmly embedded in the fiber gaps.

[0042] This utility model has the following beneficial effects:

[0043] 1. Excellent breathability: The non-woven fabric adopts a multi-layer gradient pore structure design, with the bottom layer being a loose bottom layer 13, which has a breathability of up to 6000g / m² / 24h. This can effectively prevent skin moisture and reduce the occurrence of pressure sores or infections. Through this multi-layer gradient pore design, the diaper can ensure the efficiency of drainage while maintaining good breathability, providing a healthier environment for the skin of the elderly.

[0044] 2. High liquid absorption efficiency: The middle layer of the nonwoven fabric is an intermediate gradient transition layer 12, which can effectively accelerate the longitudinal flow of liquid; the outer layer is a dense outer layer 11, which helps to reduce liquid residue and prevent leakage or backflow.

[0045] 3. Excellent comfort: The non-woven fabric contains bamboo charcoal viscose fiber and aloe vera microcapsules, which are soft and skin-friendly to the touch. Its waist and leg design has excellent flexibility and will not leave marks even if used in bed for a long time.

[0046] 4. Excellent environmental performance: The main component of non-woven fabric is PLA fiber, which is biodegradable. The degradation rate is as high as 68% in 180 days, which can significantly reduce the burden of waste disposal and is beneficial to environmental protection.

[0047] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0048] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An absorbent sheet, characterized in that, It includes a dense outer layer, an intermediate gradient transition layer, and a loose bottom layer. The dense outer layer, the intermediate gradient transition layer, and the loose bottom layer are connected in sequence and each has a plurality of first water absorption holes, a plurality of second water absorption holes, and a plurality of third water absorption holes evenly distributed thereon. The pore sizes of the first water absorption holes, the second water absorption holes, and the third water absorption holes increase in sequence.

2. The absorbent sheet according to claim 1, characterized in that, The diameter of the first water absorption hole is 10–30 μm.

3. The absorbent sheet according to claim 1, characterized in that, The diameter of the second water absorption hole is 50-100 μm.

4. The absorbent sheet according to claim 1, characterized in that, The diameter of the third water absorption hole is 150–300 μm.

5. The absorbent sheet according to claim 1, characterized in that, The outer dense layer, the middle gradient transition layer, and the bottom loose layer are all non-woven fabric layers.

6. The absorbent sheet according to claim 5, characterized in that, The nonwoven fabric layer is formed by interweaving PLA fiber layer, bamboo charcoal viscose fiber layer and alginate fiber layer.

7. The absorbent sheet according to claim 1, characterized in that, The absorbent sheet also includes an antibacterial functional layer bonded to the dense outer layer.

8. The absorbent sheet according to claim 1, characterized in that, The absorbent pad also includes aloe vera extract microcapsules, which are disposed in the first absorbent hole.

9. The absorbent sheet according to claim 8, characterized in that, The aloe vera extract microcapsules have a particle size of 5–10 μm.

10. A diaper pad, characterized in that, Includes the absorbent sheet as described in any one of claims 1 to 9.

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