An absorbent article having a breathable article with urine visualization

Abstract

This utility model relates to the field of hygiene product technology, specifically to a breathable product with a urine indicator and an absorbent product with a breathable structure, comprising an EPTFE membrane and a moisture-proof and air-proof membrane; the moisture-proof and air-proof membrane is disposed on the EPTFE membrane and bonded and fixed in a certain area; the moisture-proof and air-proof membrane has multiple through holes; the moisture-proof and air-proof membrane also has a urine indicator adhesive application area; the basis weight of the moisture-proof and air-proof membrane at the urine indicator adhesive application area is not less than 10 gsm; the urine indicator adhesive application area has a non-porous area and / or a microporous area, the pore size d of the microporous area being in the range of 0 < d < 0.5 micrometers; urine indicator adhesive is disposed on the urine indicator adhesive application area. This utility model, by setting a urine indicator adhesive application area on the moisture-proof and air-proof membrane, with a basis weight greater than 10 gsm, and the urine indicator adhesive application area having no moisture-permeable pores or very small moisture-permeable pores, allows urine indicator adhesive to be applied to the urine indicator adhesive application area without the urine indicator adhesive permeating the EPTFE membrane, thus forming a breathable product that simultaneously possesses breathability and urine indicator functions.

Description

Technical Field

[0001] This utility model relates to the field of hygiene products technology, specifically to a breathable product with a urine indicator and an absorbent product with a breathable structure. Background Technology

[0002] Since its initial introduction in 1978, urine indicator gel has been very popular in disposable absorbent products such as baby care products and adult incontinence products. The urine indicator gel is usually coated in lines on the side of the bottom film facing the core layer. When urine wets the absorbent core layer and is conducted to the surface of the urine indicator gel, its pH value changes, causing a color change, thus achieving the visual monitoring function of urine detection. This alerts parents, caregivers, and wearers that the product is wet. The bottom film coated with the urine indicator gel is often a PE calcium carbonate film, which is a moisture-permeable but not air-permeable film. Although it can release some moisture to the outside environment, its low breathability prevents the exchange of fresh air with the outside, resulting in a stuffy environment inside the product that is detrimental to the user's skin health.

[0003] With consumers' increasing demand for high breathability in disposable absorbent products, more and more breathable bottom films have been applied to the breathable and liquid-impermeable bottom layer of disposable absorbent products such as diapers. A typical product is the EPTFE composite material mentioned in Chinese invention patent CN116808270A, entitled "A Disposable Highly Breathable Composite Fiber Material, Manufacturing Method, Apparatus and Hygiene Products". This material has solved the problem of insufficient breathability of PE calcium carbonate film. However, the above-mentioned high breathability material also has the problems of excessive moisture permeability and inability to add a urine indicator. This is because the EPTFE film has a high porosity (about 80%) and a large pore size (about 1.0 μm), as well as the oleophilicity of the EPTFE film.

[0004] EPTFE membranes in EPTFE composites cannot directly contact urine indicator gels. This is because urine indicator gels contain highly polar hydrophilic components and indicators, whose hydrophilicity and permeability are far stronger than those of urine and water. When these highly hydrophilic components come into contact with the EPTFE membrane, they will directly penetrate into or pass through the micropores of the EPTFE membrane. This will cause leakage when the user urinates in large quantities, resulting in inconvenience to consumers. This is something that consumers, users, and manufacturers do not want to see. Therefore, some people have proposed to reduce the permeability of urine indicator gels to EPTFE membranes by reducing the highly hydrophilic components. However, this method has the following drawbacks: (1) It will greatly prolong the color change time of urine indicator gels and cannot provide timely feedback on urination status; (2) Compared with conventional urine indicator gels, this low-hydrophilic urine indicator gel will increase the cost by about 1 to 2 times due to production and usage issues. Moreover, it often needs to be used alternately with conventional urine indicator gels during the production process. Frequent gel removal and replacement will also increase production costs and is not conducive to the market promotion of the product.

[0005] The Chinese invention patent with publication number CN120000429A, entitled "A Composite Material and Absorbent Material," proposes a solution that introduces a moisture-proof and air-barrier membrane. This retains the high permeability and high barrier properties of the EPTFE composite material while reducing moisture loss. Furthermore, the designed membrane allows for the addition of urine indicator gel in non-porous areas (the gel does not contact the EPTFE membrane), thus enhancing the urine indicator function. However, this method also has drawbacks:

[0006] (1) Generally speaking, urine indicator strips (one or more) need to be coated in the middle of the bottom film. That is, the urine indicator adhesive coating area of ​​bottom films of different widths is in the center of its width. However, moisture-proof and air-proof films need to be produced using corresponding molds. Therefore, in order to meet the middle blank space requirements (i.e., unopened area) of bottom films of different widths (such as 130mm, 160mm, 170mm, etc.), it is necessary to use molds that correspond one-to-one with bottom films of different widths. This will greatly increase the production cost of the product and is not conducive to market promotion.

[0007] (2) Due to the different cutting requirements of different widths, the moisture-proof and air-proof film is designed as a product with the open area and the white strip area (non-open area) regularly spaced according to the width. This also brings problems: because the strength of the open area and the white strip area (non-open area) is inconsistent, the shrinkage rate of the central area and the two sides of the moisture-proof and air-proof film is inconsistent during the composite process. This makes it difficult to ensure that the white strip area is in the exact center of each bottom film (the white strip area will also shrink and narrow under force), which increases the production difficulty and increases the scrap rate.

[0008] Therefore, there is an urgent need in the field for a breathable product capable of applying urine indicator gel. Utility Model Content

[0009] To address the aforementioned problems, the purpose of this utility model is to provide a breathable product with a urine indicator and an absorbent product incorporating breathability.

[0010] The technical solution provided by this utility model is as follows:

[0011] In a first aspect, a breathable product with a urine indicator includes an EPTFE membrane and a moisture-proof and air-proof membrane; the moisture-proof and air-proof membrane is disposed on the EPTFE membrane and bonded and fixed in a certain area; the moisture-proof and air-proof membrane is provided with multiple through holes;

[0012] The moisture-proof and air-proof membrane is further provided with a urine indicator adhesive coating area; the weight of the moisture-proof and air-proof membrane at the urine indicator adhesive coating area is not less than 10 gsm; the urine indicator adhesive coating area has a non-porous area and / or a microporous area, and the pore diameter d of the microporous area is in the range of 0 < d < 0.5 micrometers; urine indicator adhesive is provided on the urine indicator adhesive coating area.

[0013] As an optional technical solution in the first aspect, the width of the urine indicator gel application area is 10mm to 30mm; the width of the urine indicator gel is 1mm to 3mm.

[0014] Optionally, the length of the urine indicator adhesive application area is the same as the length of the breathable product; the ratio of the length of the urine indicator adhesive to the length of the urine indicator adhesive application area is in the range of 1 / 3 to 2 / 5.

[0015] As an optional technical solution in the first aspect, the moisture-proof and air-proof membrane is composed of one or more of polyethylene, polypropylene, and polyethylene terephthalate.

[0016] As one of the alternative technical solutions in the first aspect, the moisture-proof and air-proof membrane has a basis weight of 10-25 gsm in areas other than the urine indicator gel coating area.

[0017] As one optional technical solution in the first aspect, multiple through holes are evenly distributed on the moisture-proof and air-proof membrane; the diameter of the through holes is no greater than 1 mm.

[0018] Furthermore, the urine indicator adhesive application area is formed by hot-pressing a moisture-proof and air-proof membrane; the thickness of the moisture-proof and air-proof membrane at the urine indicator adhesive application area is less than the thickness of the moisture-proof and air-proof membrane in other areas.

[0019] The pore size of the moisture-proof and air-proof membrane in the urine indicator adhesive coating area is smaller than that in other areas of the moisture-proof and air-proof membrane.

[0020] As an optional technical solution in the first aspect, the adhesion of the urine indicator gel to the urine indicator gel application area is 36-42 dyn / cm.

[0021] Secondly, an absorbent article, comprising the breathable article with a urine indicator as described in the first aspect or any of the optional technical solutions of the first aspect.

[0022] As an alternative technical solution in the second aspect, it also includes a liquid-permeable layer, an absorbent layer, and a nonwoven fabric; wherein the liquid-permeable layer, the absorbent layer, the breathable product with a urine indicator, and the nonwoven fabric are stacked in sequence. The urine indicator adhesive coating area of ​​the breathable product is close to the absorbent layer.

[0023] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0024] This invention features a urine indicator adhesive application area on a moisture-proof and air-proof membrane. The basis weight of this area is greater than 10 gsm, and it includes either non-porous or microporous regions. The non-porous regions do not form moisture-permeable pores, or the microporous regions have very small pore sizes (<0.5 μm). Therefore, urine indicator adhesive can be applied to this area without permeating the EPTFE membrane. The resulting breathable product possesses high air permeability, low moisture permeability, and a urine indicator function. Furthermore, the moisture-proof and air-proof membrane used in this invention has a uniformly open-pore structure, ensuring stable air and moisture permeability across the entire width. Because there are no localized white stripe areas, the moisture-proof and air-proof membrane is less prone to localized shrinkage and deformation during actual processing. Attached Figure Description

[0025] Figure 1 This is a top view of a breathable article in one embodiment of this application;

[0026] Figure 2 This is a side view of a breathable article in one embodiment of this application;

[0027] Figure 3 This is a schematic diagram of an absorbent article in one embodiment of this application.

[0028] Explanation of the labels in the diagram:

[0029] Moisture-proof and air-proof membrane 101;

[0030] Through hole 102;

[0031] EPTFE membrane 103;

[0032] Non-woven fabric 104;

[0033] Liquid permeable layer 105;

[0034] Absorption layer 106;

[0035] Urine indicator gel application area 201;

[0036] Urine indicator gel 202. Detailed Implementation

[0037] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0038] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0039] In one embodiment, this application proposes a breathable article with a urine indicator, such as... Figure 1-2 As shown, the breathable product includes an EPTFE membrane 103 and a moisture-proof and air-proof membrane 101, wherein the moisture-proof and air-proof membrane 101 is disposed on the EPTFE membrane 103 and is bonded and fixed in a certain area. The moisture-proof and air-proof membrane 101 is provided with a plurality of through holes 102.

[0040] The arrangement of the EPTFE membrane 103 and the moisture-proof and air-proof membrane 101 can refer to existing technologies, such as the technical solutions disclosed in Chinese invention patent with publication number CN120000429A entitled "A Composite Material and Absorbent Product", which will not be elaborated or limited here.

[0041] In order to apply urine indicator adhesive 202 to the moisture-proof and air-proof membrane 101 without setting a white strip area (unperforated area) on the moisture-proof and air-proof membrane 101, and to prevent the urine indicator adhesive 202 from penetrating into the EPTFE membrane 103 through the through holes 102 provided in the moisture-proof and air-proof membrane 101, in this embodiment, a urine indicator adhesive application area 201 is provided on the moisture-proof and air-proof membrane 101, and the urine indicator adhesive 202 is applied to the urine indicator adhesive application area 201.

[0042] The urine indicator adhesive application area 201 on the moisture-proof and air-proof membrane 101 in this embodiment differs from the white strip area (unperforated area) on existing moisture-proof and air-proof membranes 101. In this embodiment, the urine indicator adhesive application area 201 is formed by hot-pressing or ultrasonically treating the moisture-proof and air-proof membrane 101 with through holes 102, thereby flattening a portion of the membrane. It should be noted that the treatment method is not limited to hot-pressing or ultrasonic treatment; other existing methods capable of subjecting the moisture-proof and air-proof membrane 101 to heat and pressure are also applicable to this application.

[0043] By heat-pressing a localized area of ​​the moisture-proof and air-proof membrane 101 with through-holes 102, the thickness of the moisture-proof and air-proof membrane 101 in this area, after being heated and compressed, is less than the thickness of other areas of the moisture-proof and air-proof membrane 101 at the urine indicator adhesive application area 201, and the pore size of the moisture-proof and air-proof membrane 101 in the urine indicator adhesive application area 201 is smaller than the pore size of other areas of the moisture-proof and air-proof membrane 101. The pore size of the through-holes 102 shrinks from millimeter-level pores to micrometer-level pores less than 0.5 micrometers, or closes to be non-porous. This area is referred to as the urine indicator adhesive application area 201. In addition, the basis weight of the moisture-proof and air-proof membrane 101 in the urine indicator adhesive application area 201 is not less than 10 gsm. Since the weight of the urine indicator gel coating area 201 is not less than 10 gsm and it is all microporous and / or non-porous areas, urine indicator gel 202 can be applied to this area. The applied urine indicator gel 202 will not penetrate the EPTFE membrane 103.

[0044] As an optional implementation, the urine indicator adhesive 202 is configured in 1-3 strips, with the length of the urine indicator adhesive 202 approximately 1 / 3 to 2 / 5 of the length of the breathable product. The width of a single strip of urine indicator adhesive 202 is approximately 1-3 mm. When multiple strips of urine indicator adhesive 202 are applied, the spacing between adjacent strips is approximately 1-5 mm. Considering the offset distance during adhesive application and the loss of air permeability in the breathable product, in this embodiment, the width of the urine indicator adhesive application area 201 is designed to be 10-30 mm, and the length of the urine indicator adhesive application area 201 is approximately the same as the length of the breathable product, i.e., the ratio of the length of the urine indicator adhesive 202 to the length of the urine indicator adhesive application area 201 ranges from 1 / 3 to 2 / 5.

[0045] Since the local area of ​​the moisture-proof and air-proof membrane 101 needs to be under certain temperature and pressure, the millimeter-sized through holes 102 can shrink into micron-sized micropores or completely close into non-porous structures. Therefore, in optional embodiments, the material of the moisture-proof and air-proof membrane 101 can be one or more of polyethylene, polypropylene, and polyethylene terephthalate.

[0046] Ink and hot melt adhesive are two common methods for applying urine indicator adhesive to disposable products such as diapers, both relying on visual indicators to show wetness. Therefore, urine indicator adhesive, as a moisture indicator composite material, can be a water-based adhesive or a hot melt adhesive, having a first color when dry and a second color when wet, with the second color differing from the first. The material and application method of urine indicator adhesive 202 are relatively mature in existing technologies and will not be elaborated or limited here. It should be noted that the adhesion of urine indicator adhesive 202 to the urine indicator adhesive application area 201 is generally 36–42 dyn / cm.

[0047] Since the urine indicator adhesive coating area 201 is formed by heating and pressurizing directly on the moisture-proof and air-proof membrane 101, in order to ensure that the basis weight of the formed urine indicator adhesive coating area 201 meets the requirements, preferably, the basis weight of the moisture-proof and air-proof membrane 101 in other areas besides the urine indicator adhesive coating area 201 is 10-25 gsm, such as 11 gsm, or 13 gsm, or 16 gsm, or 17 gsm, or 22 gsm, or 25 gsm, etc.

[0048] Optionally, the through holes 102 on the moisture-proof and air-proof membrane 101 can be evenly distributed. When the moisture-proof and air-proof membrane 101 has a uniformly open structure, it can ensure the stability of air and moisture permeability across the entire width. Moreover, since there are no local white stripe areas, the moisture-proof and air-proof membrane is less prone to local shrinkage and deformation during actual use.

[0049] In addition, in order to better obtain microporous or non-porous regions and avoid the occurrence of random large holes (millimeter level), the diameter of the through hole 102 is no greater than 1 mm.

[0050] In one embodiment, this application also proposes an absorbent article comprising the breathable article with a urine indicator as described in any of the above embodiments.

[0051] Specifically, such as Figure 3 As shown, the absorbent material also includes a liquid-permeable layer 105, an absorbent layer 106, and a non-woven fabric 104. The liquid-permeable layer 105, the absorbent layer 106, the breathable product with a urine indicator, and the non-woven fabric 104 are stacked in sequence. The moisture-proof and air-proof membrane 101 in the breathable product with a urine indicator is close to the absorbent layer 106, that is, the urine indicator adhesive coating area 201 is close to the absorbent layer 106.

[0052] Example 1

[0053] Disposable absorbent products such as Figure 3As shown, the liquid-permeable layer 105 is made of hydrophilic hot-air nonwoven fabric with a basis weight of 40 gsm, the absorbent layer 106 is made of a composite core with a basis weight of 400 gsm, and the bottom layer is the breathable product with a urine indicator proposed in this application. Specifically, the breathable product is laid flat below the absorbent layer 106, and the urine indicator adhesive application area 201 is on the side close to the absorbent layer 106. The urine indicator adhesive 202 is applied to the urine indicator adhesive application area 201. The urine indicator adhesive 202 consists of three adhesive strips with a width of 2 mm and a length of 210 mm. The breathable product is a composite of an EPTFE membrane 103 and a moisture-proof and air-proof membrane 101. The moisture-proof and air-proof membrane 101 is placed on the EPTFE membrane 103 and is bonded and fixed in some areas, with a basis weight of 27 gsm. The moisture-proof and air-proof membrane 101 is a PE perforated membrane with a basis weight of 18 gsm, an open porosity of 30%, and a pore size of 0.5 mm. The urine indicator gel coating area 201 is formed by locally ironing the moisture-proof and air-proof membrane 101. The ironing temperature is 100℃ and the pressure is 40kg / cm. 2 The urine indicator adhesive application area 201 is located in the middle of the breathable product, with a width of 30cm and a length consistent with the breathable product.

[0054] The only difference between Comparative Example 1 and Example 1 is that the bottom layer of the absorbent product uses a breathable product with a urine indicator, and the non-woven fabric 104 is on the side close to the absorbent layer 106, with the urine indicator adhesive 202 directly applied to the non-woven fabric 104.

[0055] The only difference between Comparative Example 2 and Example 1 is that the bottom layer of the absorbent material is made of a breathable material that has not been locally ironed, and the urine indicator adhesive 202 is directly applied to the perforated moisture-proof and air-proof membrane.

[0056] The only difference between Comparative Example 3 and Example 1 is that the bottom layer of the absorbent material is a conventional PE breathable membrane with added calcium carbonate.

[0057] Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 were tested for diaper leakage according to the national standard GB / T 28004.1. The leakage amount includes water vapor leakage and liquid leakage. The national standard requires that the leakage amount <1g is qualified. The data are shown in Table 1.

[0058] Table 1:

[0059]

[0060] As shown in Table 1, the absorbent material described in Example 1 has a qualified leakage rate, which is basically consistent with the moisture permeability and leakage of the PE calcium carbonate membrane, while the air permeability is increased by 200 times. In contrast, the absorbent materials used in Comparative Examples 1 and 2 have excessive leakage rates.

[0061] Test methods and standards:

[0062] The test method and standard for the air permeability of sheet materials shall be conducted in accordance with the provisions of GB / T 5453.

[0063] The test method and standard for the moisture permeability of sheet materials shall be conducted in accordance with the provisions of ASTM E96.

[0064] The test method and standard for hydrostatic pressure of sheet materials shall be carried out in accordance with the provisions of GB / T 4744.

[0065] The testing methods and standards for the leakage of finished products shall be conducted in accordance with the provisions of GB / T 28004.

[0066] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A breathable product with a urine indicator, comprising an EPTFE membrane (103) and a moisture-proof and air-proof membrane (101); The moisture-proof and air-proof membrane (101) is disposed on the EPTFE membrane (103) and is bonded and fixed in a certain area; The moisture-proof and air-proof membrane (101) is provided with a plurality of through holes (102); Its features are: The moisture-proof and air-proof membrane (101) is also provided with a urine indicator gel coating area (201); The moisture-proof and air-proof membrane (101) has a weight of not less than 10 gsm in the urine indicator gel coating area (201); The urine indicator gel coating area (201) has a non-porous area and / or a microporous area, and the pore diameter d of the microporous area is in the range of 0 < d < 0.5 micrometers; Urine indicator gel (202) is provided on the urine indicator gel application area (201).

2. The breathable product with a urine indicator according to claim 1, characterized in that: The width of the urine indicator gel application area (201) is 10mm to 30mm; The length of the urine indicator gel coating area (201) is the same as the length of the breathable product.

3. The breathable product with a urine indicator according to claim 1, characterized in that: The moisture-proof and air-proof membrane (101) is composed of one or more of polyethylene, polypropylene, and polyethylene terephthalate.

4. The breathable product with a urine indicator according to claim 1, characterized in that: The moisture-proof and air-proof membrane (101) has a weight of 10-25 gsm in areas other than the urine-indicating gel coating area (201).

5. The breathable product with a urine indicator according to claim 1, characterized in that: Multiple through holes (102) are evenly distributed on the moisture-proof and air-proof membrane (101); The diameter of the through hole (102) is no greater than 1 mm.

6. The breathable product with a urine indicator according to claim 4 or 5, characterized in that: The urine indicator gel coating area (201) is formed by hot-pressing a moisture-proof and air-proof membrane (101); The thickness of the moisture-proof and air-proof membrane (101) at the urine indicator coating area (201) is less than the thickness of the moisture-proof and air-proof membrane (101) in other areas; The pore size of the moisture-proof and air-proof membrane (101) at the urine indicator coating area (201) is smaller than the pore size of other areas of the moisture-proof and air-proof membrane (101).

7. An absorbent product, characterized in that: Including the breathable article with a urine indicator as described in any one of claims 1-6.

8. The absorbent article according to claim 7, characterized in that: It also includes a liquid-permeable layer (105), an absorbent layer (106), and a nonwoven fabric (104); Among them, the liquid permeable layer (105), the absorbent layer (106), the breathable product with urine indicator, and the non-woven fabric (104) are stacked in sequence; In a breathable product with a urine indicator, the urine indicator adhesive coating area (201) is close to the absorbent layer (106).

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