A flushable and fully degradable sanitary napkin and panty liner

Abstract

The present invention relates to the field of disposable sanitary products, and discloses a flushable and fully degradable sanitary napkin and panty liner, comprising a water-dispersible surface layer, a water-dispersible absorption layer, a water-dispersible liquid barrier layer and a water-dispersible bottom layer arranged in sequence from top to bottom; the water-dispersible surface layer, the water-dispersible absorption layer, the water-dispersible liquid barrier layer and the water-dispersible bottom layer are all made of degradable materials; the water-dispersible liquid barrier layer comprises at least one hydrophilic material layer and at least one hydrophobic material coating; at least one side of each hydrophobic material coating is in contact with a hydrophilic material layer. The present invention can solve the contradiction between anti-leakage and flushability by designing the liquid barrier layer as a composite structure of a hydrophilic material layer and a hydrophobic material coating, so that the sanitary napkin and panty liner have better anti-leakage while achieving overall flushability.

Description

Technical Field

[0001] The invention relates to the field of disposable sanitary products, in particular to a flushable and fully degradable sanitary napkin and a panty liner. Background Art

[0002] Sanitary napkins and panty liners are essential personal hygiene care products for women in their daily lives during their menstrual period. Traditional sanitary napkins and panty liners are mostly made of synthetic fibers. After being discarded, the products cannot be naturally degraded or recycled. They have become a new white pollution and have caused great harm to the environment. Therefore, the development of new sanitary napkins and panty liners that are degradable and flushable is a hot topic in the current sanitary care products industry.

[0003] At present, in order to meet the requirements of green, environmentally friendly and recyclable products, sanitary napkins and panty liners have begun to focus on the research of biodegradable materials, and use biodegradable materials to replace high molecular polymers to prepare sanitary products, such as using polylactic acid and thermoplastic biodegradable plastics to prepare the bottom layer of sanitary care products. However, these sanitary napkins and panty liners cannot be thrown directly into the toilet after use, and cannot meet the flushability requirements, and the problem of environmental pollution still exists. According to the needs of product use, sanitary napkins and panty liners must have high absorbency and anti-reseepage when in use, the bottom layer must be leak-proof and water-repellent, the product structure must be stable and have a certain strength, and no stratification phenomenon must occur. At the same time, it is also required that the product must be easily dispersed in water after use, and each layer can be separated in water. But so far, there are no sanitary napkins and panty liners on the market that meet the requirements of truly flushable and degradable regulations (that is, in accordance with the provisions of INDA EDANA's "Guidelines for the Assessment of Flushability of Disposable Nonwoven Products").

[0004] The patent with application number CN202110395648.3 discloses a degradable sanitary napkin for women. Although it can solve the problem that traditional sanitary napkins are non-recyclable and non-biodegradable, the bottom film material is made of thermoplastic biodegradable plastics and thermoplastic polylactic acid fibers, which are thermoplastic materials and cannot meet the flushability requirements. Application number CN01205544.1 discloses a tear-off water-flushed sanitary napkin, including a top surface, an absorption layer and a bottom film. The absorption layer and the top surface are hygroscopic materials and can be quickly separated or dispersed in a water flushing system, but the bottom film is a liquid-impermeable material and cannot be separated or dispersed in a water flushing system. After the sanitary napkin is used, the bottom film that is not easily soluble needs to be torn off and thrown into the trash can, and the top surface and the absorption layer are directly placed in a water flushing system to be flushed, which is inconvenient to use. The patent with application number CN201520417212.X discloses a completely degradable sanitary pad with a flushable main body. However, the problem exists that the bottom film cannot be flushed and the product as a whole does not meet the requirement of being completely flushable.

[0005] In summary, there are currently no sanitary napkins or panty liners that can meet the requirements of overall flushability and full degradation. How to achieve flushability and full degradation while ensuring anti-leakage performance is the main problem currently facing the industry. It has become an urgent task for the industry to develop a sanitary napkin or panty liner that can be naturally degraded, has overall flushability, and has good anti-leakage performance, so that the product can be directly thrown into the toilet after use without causing clogging of the toilet and sewer pipes, and realize a truly dispersible, fully degradable green and environmentally friendly product. Summary of the invention

[0006] In order to solve the technical problem that existing sanitary napkins and panty liners are difficult to be flushable as a whole, the present invention provides a flushable and fully degradable sanitary napkin and panty liners. The sanitary napkin and panty liners can be flushable and fully degradable as a whole and have good anti-leakage performance.

[0007] The specific technical scheme of the present invention is:

[0008] A flushable and fully degradable sanitary napkin and panty liner, comprising a water-dispersible surface layer, a water-dispersible absorption layer, a water-dispersible liquid barrier layer and a water-dispersible bottom layer arranged in sequence from top to bottom; the water-dispersible surface layer, the water-dispersible absorption layer, the water-dispersible liquid barrier layer and the water-dispersible bottom layer are all made of degradable materials; the water-dispersible liquid barrier layer comprises at least one hydrophilic material layer and at least one hydrophobic material coating layer; at least one side of each of the hydrophobic material coating layers is in contact with a hydrophilic material layer; the width of the water-dispersible absorption layer is not greater than the width of the water-dispersible bottom layer.

[0009] In the sanitary napkin and panty liner of the present invention, the surface layer, the absorption layer, the liquid barrier layer and the bottom layer are all water dispersible, that is, they can be dispersed by water, and are made of degradable materials, which can achieve the requirements of overall dispersibility and full degradation. In addition, in order to solve the contradiction between anti-leakage and dispersibility, while achieving overall dispersibility, the sanitary napkin and panty liner have better anti-leakage, the present invention adopts a special liquid barrier layer design, which is as follows:

[0010] The liquid barrier layer is designed to be a composite structure of a hydrophilic material layer and a hydrophobic material coating, and at least one side of the hydrophobic material coating is in contact with a hydrophilic material layer. When in use, the hydrophobic material coating can use its strong water repellency to prevent menstrual blood from leaking to the bottom layer; after being thrown into the toilet, the hydrophilic material layer disperses or dissolves in the water, and the hydrophobic material coating attached to its surface will be detached. The discrete hydrophobic material has low strength and is easily broken and dispersed in water. In this way, sanitary napkins and panty liners can meet the overall flushability requirements while having better anti-leakage properties.

[0011] Preferably, the water-dispersible liquid-isolating layer comprises a hydrophilic material layer and a hydrophobic material coating, wherein the hydrophobic material coating is disposed above the hydrophilic material layer.

[0012] After being thrown into the toilet, water penetrates from the bottom through the bottom layer into the hydrophilic material layer, causing it to disperse or dissolve, thereby causing the hydrophobic material coating to detach from its attachment and break and disperse. Since the hydrophobic material coating is arranged above the hydrophilic material layer, during storage and use, the barrier effect of the hydrophilic material layer can be used to prevent the hydrophobic material from slowly penetrating into the bottom layer, thereby ensuring that the bottom layer has good wettability. After being thrown into the toilet, water can quickly penetrate into the hydrophilic material layer through the bottom layer. In this way, sanitary napkins and panty liners can have good flushability.

[0013] Preferably, the water-dispersible liquid-isolating layer comprises two hydrophilic material layers and a hydrophobic material coating layer, and the hydrophobic material coating layer is arranged between the two hydrophilic material layers.

[0014] When the liquid barrier layer adopts the above structure, since the hydrophobic material coating is wrapped between two hydrophilic material layers, it will not directly contact the absorption layer during the production process, thus preventing the hydrophobic material coating from being damaged by the absorption layer during the pressing process, so that the hydrophobic material coating can play a better anti-leakage role.

[0015] Preferably, the width of the hydrophobic material coating is smaller than the width of the hydrophilic material layer; the width of the hydrophobic material coating is larger than the width of the water-dispersible absorption layer.

[0016] The above-mentioned width design is helpful in preventing menstrual blood from penetrating from the absorption layer into the hydrophilic material layer and the bottom layer. At the same time, it is also helpful for the hydrophobic material coating to be dispersed under the action of the hydrophilic material layer after being thrown into the toilet. In addition, the hydrophobic material coating will affect the adhesion between the layers. Controlling its width to be smaller than the hydrophilic material layer is beneficial to the adhesion between the edge of the surface layer and the hydrophilic material layer.

[0017] Preferably, the mass per unit area of ​​the water-dispersible liquid barrier layer is 30 to 270 g / m 2 .

[0018] Preferably, the hydrophilic material layer has a unit area mass of 8 to 100 g / m 2 Water-soluble polyvinyl alcohol film.

[0019] Preferably, the material of the hydrophilic material layer is a dispersible fiber material; at least one side of the hydrophilic material layer is coated with water-soluble polyvinyl alcohol, and the coating amount is 8 to 30 g / m 2 .

[0020] Preferably, the hydrophilic material layer is made of a disintegrable fiber material; the mass per unit area of ​​the hydrophilic material layer is 40 to 80 g / m 2 .

[0021] Preferably, the mass per unit area of ​​the hydrophobic material coating is 2 to 40 g / m2 , more preferably 4 to 20 g / m 2 .

[0022] Preferably, the water-dispersible surface layer comprises a hydrophilic layer and a water-repellent layer disposed above the hydrophilic layer.

[0023] The surface layer adopts a composite structure of a hydrophilic layer and a water-repellent layer, which has the following functions: during use, menstrual blood penetrates from top to bottom. The difference in hydrophilicity between the two layers can accelerate the penetration of menstrual blood into the hydrophilic layer, so that the surface of the sanitary napkin and panty liner remains dry during use; after being thrown into the toilet, the hydrophilic layer is easily dispersed in water, which can promote the dispersion of the water-repellent layer composited on its surface, thereby making the sanitary napkin and panty liner have better flushability.

[0024] Preferably, the water-dispersible surface layer and / or the water-dispersible bottom layer are made of ultra-short fibers with a linear density of 0.5 to 4.0 dtex and a length of 2 to 10 mm.

[0025] Preferably, at least one adhesive coating area is provided on the lower surface of the water-dispersible base layer; a water-soluble adhesive layer and a pressure-sensitive adhesive layer are provided in the adhesive coating area; the upper surface of the water-soluble adhesive layer is in contact with the lower surface of the water-dispersible base layer; and the upper surface of the pressure-sensitive adhesive layer is in contact with the lower surface of the water-soluble adhesive layer.

[0026] In the prior art, pressure-sensitive adhesives are often used to fix sanitary napkins, panty liners and clothing. The present invention provides a water-soluble adhesive layer between the pressure-sensitive adhesive layer and the bottom layer, which has the following functions:

[0027] 1) Pressure-sensitive adhesives will affect the water dispersibility of the bottom layer. However, providing a water-soluble adhesive layer on the contact surface between the pressure-sensitive adhesive and the bottom layer can reduce the effect of the pressure-sensitive adhesive on the water dispersibility of the bottom layer. The reason is that when sanitary napkins and panty liners are thrown into water, the water-soluble adhesive layer dissolves, which can cause the pressure-sensitive adhesive to detach from the bottom layer, greatly reducing its effect on the dispersibility of the bottom layer.

[0028] 2) The bottom material is made of ultra-short fibers. To ensure that the bottom layer is flushable, the fiber entanglement strength on its surface is low. During use, the fibers on the bottom surface may be peeled off by the pressure-sensitive adhesive, causing the pressure-sensitive adhesive to stick to the clothing, and sanitary napkins and panty liners are difficult to be firmly fixed on the clothing. By providing a water-soluble adhesive coating, the peeling strength of the fibers on the bottom surface can be improved to prevent the bottom layer and the pressure-sensitive adhesive from separating during use.

[0029] Furthermore, the area of ​​the pressure-sensitive adhesive layer is smaller than the area of ​​the water-soluble adhesive layer.

[0030] Furthermore, in the pressure-sensitive adhesive layer, the pressure-sensitive adhesive is distributed in spaced strips.

[0031] Furthermore, the mass per unit area of ​​the water-soluble adhesive layer is 2 to 10 g / m 2 .

[0032] When the amount of water-soluble adhesive applied on the bottom surface is too large, the bottom surface will become hard, reducing the consumer's product experience. At the same time, too high an amount of coating will also increase the difficulty of drying, which is not conducive to improving production efficiency. When the amount of water-soluble adhesive applied is too low, it will cause the water-soluble adhesive layer to be difficult to effectively play the role of improving the water dispersibility of the bottom surface and preventing the bottom surface from separating from the pressure-sensitive adhesive during use. Based on this, the present invention team has determined the optimal range of the above water-soluble adhesive coating amount after a large number of experimental studies.

[0033] Preferably, both sides of the water-dispersible surface layer are provided with leak-proof edges; the leak-proof edges include at least one group of water-soluble fixing lines and a plurality of strip-shaped hydrophobic materials fixed in the water-soluble fixing lines.

[0034] When the amount of menstrual blood is large, the leak-proof partition can reduce the risk of side leakage. In order to ensure a better side leakage prevention effect, the traditional leak-proof partition is made of hydrophobic non-woven materials and does not have the performance of being flushable in water. The present invention adopts a leak-proof partition with a special structure. The strip-shaped hydrophobic material has good water repellency, and the part that is not fixed in the water-soluble fixing line is relatively fluffy and three-dimensional, thereby giving the leak-proof partition a better side leakage prevention performance; at the same time, because the strip-shaped hydrophobic material is fixed by the water-soluble fixing line, when it is thrown into the toilet, the water-soluble fixing line dissolves after contacting with a large amount of water, and the fixed strip-shaped hydrophobic material is separated and flushed in the water. In this way, the contradiction between the side leakage prevention performance and flushability of the leak-proof partition can be resolved.

[0035] Furthermore, the length direction of the water-soluble fixing line is consistent (including approximately consistent) with the length direction of the leak-proof partition edge (i.e. the length direction of the sanitary napkin and panty liner); the length direction of the strip hydrophobic material is consistent (including approximately consistent) with the width direction of the leak-proof partition edge; and one end of the strip hydrophobic material close to the center of the water-dispersible surface layer is not fixed in the water-soluble fixing line.

[0036] The above structural design can take advantage of the difference in liquid penetration direction during use and after being thrown into the toilet, so that the leak-proof partition has good flushability and high strength when in use. Specifically: during use, menstrual blood invades the leak-proof partition from the side close to the center of the surface layer. The fluffy and three-dimensional strip-shaped hydrophobic material on this side can prevent menstrual blood from penetrating into the inside of the leak-proof partition. While playing the role of preventing side leakage, it can reduce the contact between menstrual blood and the water-soluble fixing line, and avoid the water-soluble fixing line from being damaged during use and losing its fixing effect. In addition, it can prevent menstrual blood from penetrating into the edge of the surface layer and destroy the bonding structure between the edge of the surface layer and other layers; after being thrown into the toilet, water invades the leak-proof partition from all directions, and can quickly contact the water-soluble fixing line, thereby flushing the leak-proof partition.

[0037] Furthermore, each group of the water-soluble fixing threads is composed of at least two water-soluble yarns that repeatedly cross each other, and strips of hydrophobic material are fixed on the intersections.

[0038] Furthermore, the water-soluble yarn is water-soluble polyvinyl alcohol yarn.

[0039] Furthermore, the dissolution temperature of the water-soluble polyvinyl alcohol yarn is 20 to 50°C, and more preferably 20 to 30°C.

[0040] Furthermore, the strip-shaped hydrophobic material is hydrophobic fiber or hydrophobic yarn; and the curling rate of the strip-shaped hydrophobic material is 5-15%.

[0041] The use of curled strip hydrophobic material can make the leakproof partition more fluffy and three-dimensional, thereby giving it a better leakproof effect. However, when the fiber curl rate is too large, it will affect the contact between the water and the soluble fixing line after being thrown into the toilet, resulting in poor flushability of the leakproof partition. Based on this, the present invention controls the curl rate of the strip hydrophobic material within the range of 5 to 15%, which can make the leakproof partition have both good side leakage prevention effect and flushability.

[0042] Furthermore, in the leak-proof partition, 5,000 to 100,000 strips of hydrophobic material are fixed to each inch of the water-soluble fixing line.

[0043] Preferably, the four edges of the water-dispersible surface layer are extended edges extending downward and fixed to the upper surface of the hydrophilic material layer; the leak-proof partition edge covers the outer surfaces on both sides of the length direction of the extended edge, and the bottom end of the leak-proof partition edge is fixed to the upper surface of the hydrophilic material layer.

[0044] Preferably, a guide layer is provided between the water-dispersible surface layer and the water-dispersible absorption layer; and a plurality of guide holes are provided in the guide layer.

[0045] By arranging guide holes in the guide layer, the liquid in the surface layer can be quickly introduced into the absorption layer through the guide holes and fixed, thereby keeping the surface layer dry and comfortable.

[0046] Furthermore, the guide layer is made of ultra-short fibers with a linear density of 0.5 to 4.0 dtex and a length of 2 to 10 mm.

[0047] Furthermore, the width of the guide layer is smaller than the width of the water-dispersible surface layer.

[0048] The present invention needs to be described as follows:

[0049] (1) The terms “flushable”, “water-dispersible”, etc. as used in the present invention refer to the test standards that comply with INDA EDANA “Guidelines for the Evaluation of Flushability of Disposable Nonwoven Products” (INDA), “GB / T 40181-2021 Test Method and Evaluation of Flushability of Disposable Sanitary Nonwoven Materials” and “GB / T 41244-2022 Flushable Spunlace Nonwoven Materials and Products”.

[0050] (2) The terms “fully degradable”, “degradable”, etc. as used in the present invention refer to compliance with one of the test standards of INDA EDANA “Guidelines for the Assessment of Flushability of Disposable Nonwoven Products” (INDA), “GB / T 33616-2017 Evaluation of Biodegradability of Textile Nonwoven Fabrics - Carbon Dioxide Release Determination Method”, and “T / CNIT A23101-2021 Evaluation of Biodegradability of Spunlace Nonwoven Fabrics and Products”.

[0051] Compared with the prior art, the present invention has the following advantages:

[0052] (1) The liquid barrier layer is designed to be a composite structure of a hydrophilic material layer and a hydrophobic material coating, which can solve the contradiction between anti-leakage and flushability. While achieving overall flushability, the sanitary napkin and panty liner have better anti-leakage properties;

[0053] (2) The surface layer adopts a composite structure of a hydrophilic layer and a water-repellent layer, which can keep the surface of sanitary napkins and panty liners dry during use and have good flushability after use;

[0054] (3) The leak-proof partition edge composed of a water-soluble fixed line and a strip of hydrophobic material has good anti-side leakage performance and good flushability;

[0055] (4) By providing a water-soluble adhesive layer between the pressure-sensitive adhesive layer and the base layer, the effect of the pressure-sensitive adhesive on the water dispersibility of the base layer can be reduced, and the peel strength of the fibers on the surface of the base layer can be increased, thereby preventing the base layer and the pressure-sensitive adhesive from separating during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a straight cross-sectional view of the flushable and fully degradable sanitary napkin in Example 1;

[0057] Figure 2 is a straight cross-sectional view of the flushable and fully degradable sanitary napkin in Examples 2 and 4;

[0058] Figure 3 is a straight cross-sectional view of the flushable and fully degradable sanitary napkin in Example 3;

[0059] Figure 4 is a straight cross-sectional view of the flushable and fully degradable pad in Example 5;

[0060] Figure 5 is a straight cross-sectional view of the flushable and fully degradable pad in Example 6;

[0061] Figure 6 is a schematic diagram of the upper surface structure of the flushable and fully degradable sanitary napkin in Example 1;

[0062] Figure 7 It is a schematic diagram of the upper surface structure of the flushable and fully degradable sanitary napkin in Examples 2 to 4;

[0063] Figure 8 is a schematic diagram of the upper surface structure of the flushable and fully degradable pad in Examples 5 and 6;

[0064] Fig. 9 is a schematic structural diagram of the leak-proof partition in Example 2;

[0065] Fig.10 is a schematic structural diagram of the leak-proof partition in Example 3;

[0066] Fig.11 is a schematic structural diagram of the leak-proof partition edge in Example 4;

[0067] Fig.12 Schematic diagram of the lower surface structure of the flushable and fully degradable sanitary napkin in Examples 1 and 8 (the coating protection pad is not shown);

[0068] Fig.13 Schematic diagram of the lower surface structure of the flushable and fully degradable sanitary napkin in Example 2 (the coating protection pad is not shown);

[0069] Fig.14 Schematic diagram of the lower surface structure of the flushable and fully degradable sanitary napkin in Examples 3 and 4 (the coating protection pad is not shown);

[0070] Fig.15 Schematic diagram of the lower surface structure of the flushable and fully degradable protective pad in Examples 5 and 6 (the coating protective pad is not shown).

[0071] The accompanying drawings are marked as: water-dispersible surface layer 1, closed guide groove 11, open guide groove 12, water-dispersible absorption layer 2, water-dispersible liquid barrier layer 3, hydrophilic material layer 31, hydrophobic material coating 32, water-dispersible bottom layer 4, adhesive coating area 41, pressure-sensitive adhesive layer 42, water-soluble adhesive layer 43, wings 5, guide layer 6, guide holes 61, leak-proof partition edge 7, water-soluble fixing line 71, strip hydrophobic material 72. DETAILED DESCRIPTION

[0072] The present invention is further described below in conjunction with the embodiments. The devices, connection structures and methods involved in the present invention are all devices, connection structures and methods known in the art unless otherwise specified.

[0073] Overall embodiment

[0074] A flushable and fully degradable sanitary napkin and panty liner, such as Figures 1 to 5 As shown, it includes a water-dispersible surface layer 1, a water-dispersible absorption layer 2, a water-dispersible liquid barrier layer 3 and a water-dispersible bottom layer 4 which are arranged in sequence from top to bottom. The water-dispersible surface layer 1, the water-dispersible absorption layer 2, the water-dispersible liquid barrier layer 3 and the water-dispersible bottom layer 4 are all made of degradable materials. The water-dispersible liquid barrier layer 3 includes at least one hydrophilic material layer 31 and at least one hydrophobic material coating 32; at least one side of each of the hydrophobic material coatings 32 is in contact with a hydrophilic material layer 31. The width of the hydrophobic material coating 32 is smaller than the width of the hydrophilic material layer 31; the width of the hydrophobic material coating 32 is larger than the width of the water-dispersible absorption layer 2. The width of the water-dispersible absorption layer 2 is not larger than the width of the water-dispersible bottom layer 4. The water-dispersible surface layer 1 and the water-dispersible bottom layer 4 are both non-woven materials. As shown Figures 13-15 As shown, the water-dispersible bottom layer 4 is provided with at least one adhesive coating area 41 on its lower surface.

[0075] As a specific implementation method, Figure 1 , 3 As shown in FIG. 4 , the water-dispersible liquid barrier layer 3 includes a hydrophilic material layer 31 and a hydrophobic material coating 32, and the hydrophobic material coating 32 is disposed above the hydrophilic material layer 31. As another specific embodiment, Figure 2 , 5 As shown, the water-dispersible liquid-isolating layer 3 includes two hydrophilic material layers 31 and a hydrophobic material coating 32 , and the hydrophobic material coating 32 is disposed between the two hydrophilic material layers 31 .

[0076] As a specific implementation, the hydrophilic material layer 31 has a unit area mass of 8 to 100 g / m 2As another specific embodiment, the hydrophilic material layer 31 is made of a dispersible fiber material; at least one side of the hydrophilic material layer 31 is coated with water-soluble polyvinyl alcohol; the coating amount of the water-soluble polyvinyl alcohol on the hydrophilic material layer 31 is 8 to 30 g / m 2 The mass per unit area of ​​the hydrophilic material layer 31 is 40 to 80 g / m 2 .

[0077] Preferably, the mass per unit area of ​​the water-dispersible liquid barrier layer 3 is 30 to 270 g / m 2 The mass per unit area of ​​the hydrophobic material coating 32 is 2 to 40 g / m 2 , more preferably 4 to 20 g / m 2 .

[0078] Preferably, if Figure 2 and 3 As shown, a guide layer 6 is provided between the water-dispersible surface layer 1 and the water-dispersible absorbent layer 2; the guide layer 6 is provided with a plurality of guide holes 61. The guide layer 6 is made of ultra-short fibers with a linear density of 0.5-4.0 dtex and a length of 2-10 mm.

[0079] Preferably, the water-dispersible surface layer 1 comprises a hydrophilic layer and a water-repellent layer disposed above the hydrophilic layer.

[0080] Preferably, the water-dispersible surface layer 1 and / or the water-dispersible bottom layer 4 are made of ultra-short fibers with a linear density of 0.5 to 4.0 dtex and a length of 2 to 10 mm.

[0081] Preferably, if Figure 2 , 3 As shown in , 7, both sides of the water-dispersible surface layer 1 are provided with leakproof partitions 7. The leakproof partitions 7 are as shown in Figures 9-11 As shown, it includes at least one group of water-soluble fixed lines 71, and a plurality of strip-shaped hydrophobic materials 72 fixed in the water-soluble fixed lines 71; the length direction of the water-soluble fixed lines 71 is consistent with the length direction of the leak-proof partition 7; the length direction of the strip-shaped hydrophobic material 72 is consistent with the width direction of the leak-proof partition 7; the end of the strip-shaped hydrophobic material 72 close to the center of the water-dispersible surface layer 1 is not fixed in the water-soluble fixed lines 71; each group of the water-soluble fixed lines 71 is composed of at least two water-soluble yarns that repeatedly cross each other, and the strip-shaped hydrophobic material 72 is fixed at the intersection. The strip-shaped hydrophobic material 72 is a hydrophobic fiber (such as Fig. 9 , 10 As shown) or hydrophobic yarn (as Fig.11The curling rate of the strip hydrophobic material 72 is 5-15%; in the leak-proof partition 7, 5000-100000 strip hydrophobic materials 72 are fixed to each inch of the water-soluble fixed line 71.

[0082] Preferably, if Fig.13 , 14 As shown, the adhesive coating area 41 is provided with a water-soluble adhesive layer 43 and a pressure-sensitive adhesive layer 42; the upper surface of the water-soluble adhesive layer 43 contacts the lower surface of the water-dispersible bottom layer 4; the upper surface of the pressure-sensitive adhesive layer 42 contacts the lower surface of the water-soluble adhesive layer 43. The unit area mass of the water-soluble adhesive layer 43 is 2 to 10 g / m 2 .

[0083] Preferably, if Figures 6 to 8 As shown, the water-dispersible surface layer 1 is provided with a guide groove; it includes at least one closed guide groove 11 and at least one open guide groove 12; the closed guide groove 11 is arranged on the periphery of the water-dispersible surface layer 1; the open guide groove 12 is arranged in the closed area of ​​the closed guide groove 11.

[0084] Example 1

[0085] A flushable and fully degradable sanitary napkin, such as Figure 1 and 6 As shown, it includes a water-dispersible surface layer 1, a water-dispersible absorption layer 2, a water-dispersible liquid barrier layer 3 and a water-dispersible bottom layer 4 arranged in sequence from top to bottom. The water-dispersible liquid barrier layer 3 includes a hydrophilic material layer 31 and a hydrophobic material coating 32 arranged above the hydrophilic material layer 31. The widths of the water-dispersible surface layer 1, the water-dispersible bottom layer 4, the hydrophilic material layer 31 and the hydrophobic material coating 32 are all greater than the water-dispersible absorption layer 2; the edges of the water-dispersible surface layer 1 extend downward and are attached to the upper surface of the hydrophilic material layer 31. Wings 5 ​​are provided on both sides of the water-dispersible surface layer 1; the wings 5 ​​are attached to the upper surface of the hydrophilic material layer 31.

[0086] The water-dispersible surface layer 1, the water-dispersible bottom layer 4 and the wings 5 ​​are all made of ultra-short fiber spunlace material, with a unit area mass of 45 g / m 2 The raw material of the ultra-short fibers is a mixture of viscose fibers and coniferous wood pulp, the fiber length is 8 mm, the linear density is 0.8 dtex, the mass proportion of viscose fibers in the ultra-short fibers is 70%, and the viscose fibers have a circular cross-section.

[0087] The width of the water-dispersible absorbent layer 2 is 80 mm, and the mass per unit area is 320 g / m 2 It is made by mixing fluff pulp and high molecular water-absorbent resin (SAP) and then opening and air flow dispersion, and the mass proportion of high molecular water-absorbent resin is 20%.

[0088] The hydrophilic material layer 31 is a water-soluble polyvinyl alcohol (PVA) film with a width of 150 mm and a mass per unit area of ​​30 g / m 2 The hydrophobic coating 32 is made of vaseline, has a width of 90 mm, and a mass per unit area of ​​8 g / m 2 .

[0089] like Figure 6 As shown, the water-dispersible surface layer 1 is provided with a guide groove; it includes a closed guide groove 11 and two open guide grooves 12; the closed guide groove 11 is annular and is arranged on the periphery of the water-dispersible surface layer 1; the open guide groove 12 is arc-shaped and is arranged in the closed area of ​​the closed guide groove 11.

[0090] like Fig.12 As shown, three adhesive coating areas 41 are provided on the lower surface of the water-dispersible bottom layer 4. A pressure-sensitive adhesive layer 42 is provided in the adhesive coating area 41. In the main body area of ​​the sanitary napkin, the pressure-sensitive adhesive is distributed in the form of spaced strips. A coating protection pad is adhered to the pressure-sensitive adhesive layer 42; the coating protection pad is a water-soluble release paper.

[0091] Example 2

[0092] A flushable and fully degradable sanitary napkin, such as Figure 2 and 7 As shown, it includes a water-dispersible surface layer 1, a guide layer 6, a water-dispersible absorption layer 2, a water-dispersible liquid barrier layer 3 and a water-dispersible bottom layer 4 arranged in sequence from top to bottom. The guide layer 6 is evenly distributed with guide holes 61 with a diameter of 2 mm, and the opening rate is 35%. The arrangement of the guide holes 61 is in a matrix. The water-dispersible liquid barrier layer 3 includes two hydrophilic material layers 31 and a hydrophobic material coating 32 arranged between the two hydrophilic material layers 31. The widths of the water-dispersible surface layer 1, the water-dispersible bottom layer 4, the hydrophilic material layer 31 and the hydrophobic material coating 32 are all greater than the water-dispersible absorption layer 2; the four edges of the water-dispersible surface layer 1 are extended edges extending downward and fixed to the upper surface of the hydrophilic material layer 31. The outer surfaces on both sides of the length direction of the extended edge are covered with leakproof partition edges 7; the bottom end of the leakproof partition edge 7 is fixed to the upper surface of the hydrophilic material layer 31. The outer side of the leakproof partition 7 is covered with a protective wing 5 , and the top of the leakproof partition 7 is not covered by the protective wing 5 ; the bottom end of the protective wing 5 is attached to the upper surface of the hydrophilic material layer 31 .

[0093] The water-dispersible surface layer 1, the guide layer 6, the water-dispersible bottom layer 4 and the wing 5 are all made of ultra-short fiber spunlace materials, with a unit area mass of 38 g / m 2The ultra-short fiber is a mixture of viscose fiber and weakly hydrophobic viscose fiber (i.e., viscose fiber treated with a silicone water-repellent finishing agent), with a fiber length of 6 mm and a linear density of 2.0 dtex. The mass proportion of the weakly hydrophobic viscose fiber is 30%. The viscose fiber has a Y-shaped cross-section, and the weakly hydrophobic viscose fiber has a circular cross-section.

[0094] The width of the water-dispersible absorbent layer 2 is 80 mm, and the mass per unit area is 320 g / m 2 It is made by mixing fluff pulp and sodium carboxymethyl cellulose, followed by loosening and air flow dispersion, with the mass proportion of sodium carboxymethyl cellulose being 20%.

[0095] The hydrophilic material layer 31 is a water-soluble polyvinyl alcohol (PVA) film with a width of 150 mm and a mass per unit area of ​​75 g / m 2 The hydrophobic coating 32 is made of vaseline, has a width of 90 mm, and a mass per unit area of ​​10 g / m 2 .

[0096] like Figure 7 As shown, the water-dispersible surface layer 1 is provided with a guide groove; it includes a closed guide groove 11 and two open guide grooves 12; the closed guide groove 11 is annular and is arranged on the periphery of the water-dispersible surface layer 1; the open guide groove 12 is arc-shaped and is arranged in the closed area of ​​the closed guide groove 11.

[0097] like Fig. 9 As shown, the leakproof edge 7 includes two groups of water-soluble fixed lines 71 and a plurality of strip-shaped hydrophobic materials 72 fixed in the water-soluble fixed lines 71. The length direction of the water-soluble fixed lines 71 is consistent with the length direction of the leakproof edge 7; the length direction of the strip-shaped hydrophobic material 72 is consistent with the width direction of the leakproof edge 7; the end of the strip-shaped hydrophobic material 72 close to the center of the water-dispersible surface layer 1 is not fixed in the water-soluble fixed line 71. Each group of water-soluble fixed lines 71 is composed of two water-soluble yarns that repeatedly cross each other, and a strip-shaped hydrophobic material 72 is fixed at the intersection; the water-soluble yarn is a water-soluble polyvinyl alcohol yarn with a dissolving temperature of 25°C. The strip-shaped hydrophobic material 72 is a hydrophobic viscose fiber with a curling rate of 15%; in the leakproof edge 7, 5,000 hydrophobic viscose fibers are fixed to each inch of the water-soluble fixed line 71.

[0098] like Fig.13As shown, three adhesive coating areas 41 are provided on the lower surface of the water-dispersible bottom layer 4. A water-soluble adhesive layer 43 and a pressure-sensitive adhesive layer 42 are provided in the adhesive coating area 41; the upper surface of the water-soluble adhesive layer 43 is in contact with the lower surface of the water-dispersible bottom layer 4; the upper surface of the pressure-sensitive adhesive layer 42 is in contact with the lower surface of the water-soluble adhesive layer 43. The area of ​​the pressure-sensitive adhesive layer 42 is smaller than the area of ​​the water-soluble adhesive layer 43. In the main body area of ​​the sanitary napkin, the water-soluble adhesive is distributed in the form of sheets, and the pressure-sensitive adhesive thereon is distributed in the form of spaced strips. The material of the water-soluble adhesive layer 43 is water-soluble polyvinyl alcohol, and the mass per unit area is 10g / m 2 A coating protection pad is adhered to the pressure-sensitive adhesive layer 42; the coating protection pad is a water-soluble release paper.

[0099] Example 3

[0100] A flushable and fully degradable sanitary napkin, such as Figure 3 and 7 As shown, it includes a water-dispersible surface layer 1, a guide layer 6, a water-dispersible absorption layer 2, a water-dispersible liquid barrier layer 3 and a water-dispersible bottom layer 4 arranged in sequence from top to bottom. The guide layer 6 is evenly distributed with guide holes 61 with a diameter of 1.5 mm, and the opening rate is 38%. The arrangement of the guide holes 61 is a matrix. The water-dispersible liquid barrier layer 3 includes a hydrophilic material layer 31 and a hydrophobic material coating 32 arranged above the hydrophilic material layer 31. The widths of the water-dispersible surface layer 1, the water-dispersible bottom layer 4, the hydrophilic material layer 31 and the hydrophobic material coating 32 are all greater than the water-dispersible absorption layer 2; the four edges of the water-dispersible surface layer 1 are extended edges that extend downward and are fixed to the upper surface of the hydrophilic material layer 31. The outer surfaces of both sides of the extended edge in the length direction are covered with leakproof partition edges 7; the bottom end of the leakproof partition edge 7 is fixed to the upper surface of the hydrophilic material layer 31. The outer side of the leakproof partition 7 is covered with a protective wing 5 , and the top of the leakproof partition 7 is not covered by the protective wing 5 ; the bottom end of the protective wing 5 is attached to the upper surface of the hydrophilic material layer 31 .

[0101] The water-dispersible surface layer 1, the guide layer 6, the water-dispersible bottom layer 4 and the wing 5 are all made of ultra-short fiber spunlace material, with a unit area mass of 40 g / m 2 The ultra-short fiber is a mixture of viscose fiber and weakly hydrophobic viscose fiber (i.e., viscose fiber treated with a silicone water-repellent finishing agent), with a fiber length of 8 mm and a linear density of 1.6 dtex. The mass proportion of the weakly hydrophobic viscose fiber is 40%, and both the weakly hydrophobic viscose fiber and the viscose fiber have a circular cross-section.

[0102] The width of the water-dispersible absorbent layer 2 is 80 mm, and the mass per unit area is 320 g / m 2It is made by mixing fluff pulp and sodium carboxymethyl cellulose, followed by loosening and air flow dispersion, with the mass proportion of sodium carboxymethyl cellulose being 20%.

[0103] The width of the hydrophilic material layer 31 is 150 mm, and the material is a flushable fiber material with a unit area mass of 42 g / m 2 The disintegrable fiber material is a mixture of viscose fiber and weakly hydrophobic viscose fiber (i.e., viscose fiber treated with a silicone water-repellent finishing agent), with a fiber length of 8 mm and a linear density of 1.6 dtex, and the mass proportion of weakly hydrophobic viscose fiber is 42%; the surface of the hydrophilic material layer 31 is coated with a layer of water-soluble polyvinyl alcohol, with a coating amount of 30 g / m 2 The hydrophobic coating 32 is made of a mixture of beeswax and glycerol, has a width of 90 mm, and a mass per unit area of ​​15 g / m 2 , glycerol accounts for 15% by mass.

[0104] like Figure 7 As shown, the water-dispersible surface layer 1 is provided with a guide groove; it includes a closed guide groove 11 and two open guide grooves 12; the closed guide groove 11 is annular and is arranged on the periphery of the water-dispersible surface layer 1; the open guide groove 12 is arc-shaped and is arranged in the closed area of ​​the closed guide groove 11.

[0105] like Fig.10 As shown, the leakproof edge 7 includes a group of water-soluble fixed lines 71 and a plurality of strip-shaped hydrophobic materials 72 fixed in the water-soluble fixed lines 71. The length direction of the water-soluble fixed lines 71 is consistent with the length direction of the leakproof edge 7; the length direction of the strip-shaped hydrophobic material 72 is consistent with the width direction of the leakproof edge 7; the end of the strip-shaped hydrophobic material 72 close to the center of the water-dispersible surface layer 1 is not fixed in the water-soluble fixed line 71. The water-soluble fixed line 71 is composed of two water-soluble yarns that repeatedly cross each other, and the strip-shaped hydrophobic material 72 is fixed at the intersection; the water-soluble yarn is a water-soluble polyvinyl alcohol yarn with a dissolving temperature of 20°C. The strip-shaped hydrophobic material 72 is a hydrophobic viscose fiber with a curling rate of 5%; in the leakproof edge 7, 100,000 hydrophobic viscose fibers are fixed to each inch of the water-soluble fixed line 71.

[0106] like Fig.14As shown, three adhesive coating areas 41 are provided on the lower surface of the water-dispersible bottom layer 4. A water-soluble adhesive layer 43 and a pressure-sensitive adhesive layer 42 are provided in the adhesive coating area 41; the upper surface of the water-soluble adhesive layer 43 is in contact with the lower surface of the water-dispersible bottom layer 4; the upper surface of the pressure-sensitive adhesive layer 42 is in contact with the lower surface of the water-soluble adhesive layer 43. The area of ​​the pressure-sensitive adhesive layer 42 is smaller than the area of ​​the water-soluble adhesive layer 43. In the main body area of ​​the sanitary napkin, the water-soluble adhesive and the pressure-sensitive adhesive are distributed in spaced strips, and each water-soluble adhesive is provided with a strip of pressure-sensitive adhesive. The material of the water-soluble adhesive layer 43 is water-soluble polyvinyl alcohol, and the mass per unit area is 10g / m 2 A coating protection pad is adhered to the pressure-sensitive adhesive layer 42; the coating protection pad is a water-soluble release paper.

[0107] Example 4

[0108] A flushable and fully degradable sanitary napkin, such as Figure 2 and 7 As shown, it includes a water-dispersible surface layer 1, a guide layer 6, a water-dispersible absorption layer 2, a water-dispersible liquid barrier layer 3 and a water-dispersible bottom layer 4 arranged in sequence from top to bottom. The guide layer 6 is evenly distributed with guide holes 61 with a diameter of 1.8 mm, and the opening rate is 40%. The guide holes 61 are arranged in a matrix. The water-dispersible liquid barrier layer 3 includes two hydrophilic material layers 31 and a hydrophobic material coating 32 arranged between the two hydrophilic material layers 31. The widths of the water-dispersible surface layer 1, the water-dispersible bottom layer 4, the hydrophilic material layer 31 and the hydrophobic material coating 32 are all greater than the water-dispersible absorption layer 2; the four edges of the water-dispersible surface layer 1 are extended edges extending downward and fixed to the upper surface of the hydrophilic material layer 31. The outer surfaces of both sides of the extended edge in the length direction are covered with leakproof partition edges 7; the bottom end of the leakproof partition edge 7 is fixed to the upper surface of the hydrophilic material layer 31. The outer side of the leakproof partition 7 is covered with a protective wing 5 , and the top of the leakproof partition 7 is not covered by the protective wing 5 ; the bottom end of the protective wing 5 is attached to the upper surface of the hydrophilic material layer 31 .

[0109] The water-dispersible surface layer 1, the guide layer 6, the water-dispersible bottom layer 4 and the wing 5 are all made of ultra-short fiber spunlace materials, with a unit area mass of 45 g / m 2 The ultra-short fiber is a mixture of viscose fiber and weakly hydrophobic viscose fiber (i.e., viscose fiber treated with a silicone water-repellent finishing agent), with a fiber length of 6 mm and a linear density of 1.6 dtex. The mass proportion of the weakly hydrophobic viscose fiber is 30%, and both the viscose fiber and the weakly hydrophobic viscose fiber have a circular cross-section.

[0110] The water-dispersible absorbent layer 2 has a width of 80 mm and a mass per unit area of ​​300 g / m 2It is made by mixing fluff pulp and sodium carboxymethyl cellulose, followed by loosening and air flow dispersion, with the mass proportion of sodium carboxymethyl cellulose being 20%.

[0111] The width of the hydrophilic material layer 31 is 150 mm, and the material is a flushable fiber material with a unit area mass of 45 g / m 2 The disintegrable fiber material is a mixture of viscose fiber and weakly hydrophobic viscose fiber (i.e., viscose fiber treated with a silicone water-repellent finishing agent), with a fiber length of 6 mm and a linear density of 1.6 dtex, and the mass proportion of weakly hydrophobic viscose fiber is 42%; the surface of the hydrophilic material layer 31 is coated with a layer of water-soluble polyvinyl alcohol, with a coating amount of 15 g / m 2 The hydrophobic coating 32 is made of a mixture of beeswax and glycerol, has a width of 90 mm, and a mass per unit area of ​​20 g / m 2 , glycerol accounts for 10% by mass.

[0112] like Figure 7 As shown, the water-dispersible surface layer 1 is provided with a guide groove; it includes a closed guide groove 11 and two open guide grooves 12; the closed guide groove 11 is annular and is arranged on the periphery of the water-dispersible surface layer 1; the open guide groove 12 is arc-shaped and is arranged in the closed area of ​​the closed guide groove 11.

[0113] like Fig.11 As shown, the leakproof edge 7 includes a group of water-soluble fixed lines 71 and a plurality of strip-shaped hydrophobic materials 72 fixed in the water-soluble fixed lines 71. The length direction of the water-soluble fixed lines 71 is consistent with the length direction of the leakproof edge 7; the length direction of the strip-shaped hydrophobic material 72 is consistent with the width direction of the leakproof edge 7; the end of the strip-shaped hydrophobic material 72 close to the center of the water-dispersible surface layer 1 is not fixed in the water-soluble fixed line 71. The water-soluble fixed line 71 is composed of two water-soluble yarns that repeatedly cross each other, and the strip-shaped hydrophobic material 72 is fixed at the intersection; the water-soluble yarn is a water-soluble polyvinyl alcohol yarn with a dissolving temperature of 25°C. The strip-shaped hydrophobic material 72 is a hydrophobic yarn with a curling rate of 10%; in the leakproof edge 7, 10,000 hydrophobic yarns are fixed to each inch of the water-soluble fixed line 71.

[0114] like Fig.14As shown, three adhesive coating areas 41 are provided on the lower surface of the water-dispersible bottom layer 4. A water-soluble adhesive layer 43 and a pressure-sensitive adhesive layer 42 are provided in the adhesive coating area 41; the upper surface of the water-soluble adhesive layer 43 is in contact with the lower surface of the water-dispersible bottom layer 4; the upper surface of the pressure-sensitive adhesive layer 42 is in contact with the lower surface of the water-soluble adhesive layer 43. The area of ​​the pressure-sensitive adhesive layer 42 is smaller than the area of ​​the water-soluble adhesive layer 43. In the main body area of ​​the sanitary napkin, the water-soluble adhesive and the pressure-sensitive adhesive are distributed in spaced strips, and each water-soluble adhesive is provided with a strip of pressure-sensitive adhesive. The material of the water-soluble adhesive layer 43 is water-soluble polyvinyl alcohol, and the mass per unit area is 2g / m 2 A coating protection pad is adhered to the pressure-sensitive adhesive layer 42; the coating protection pad is a water-soluble release paper.

[0115] Example 5

[0116] A flushable and fully degradable pad, such as Figure 4 and 8 As shown, it includes a water-dispersible surface layer 1, a water-dispersible absorption layer 2, a water-dispersible liquid barrier layer 3 and a water-dispersible bottom layer 4 arranged in sequence from top to bottom. The water-dispersible liquid barrier layer 3 includes a hydrophilic material layer 31 and a hydrophobic material coating 32 arranged above the hydrophilic material layer 31. The widths of the water-dispersible surface layer 1, the water-dispersible bottom layer 4, the hydrophilic material layer 31 and the hydrophobic material coating 32 are all greater than the water-dispersible absorption layer 2; the edges of the water-dispersible surface layer 1 extend downward and adhere to the upper surface of the hydrophilic material layer 31.

[0117] The water-dispersible surface layer 1 and the water-dispersible bottom layer 4 are both ultra-short fiber spunlace materials, with a unit area mass of 40 g / m 2 The raw material of the ultra-short fibers is a mixture of viscose fibers and coniferous wood pulp, the fiber length is 8 mm, the linear density is 0.8 dtex, the mass proportion of viscose fibers in the ultra-short fibers is 70%, and the viscose fibers have a circular cross-section.

[0118] The width of the water-dispersible absorbent layer 2 is 70 mm, and the mass per unit area is 230 g / m 2 It is made by mixing fluff pulp and high molecular water-absorbent resin (SAP) and then opening and air flow dispersion, and the mass proportion of high molecular water-absorbent resin is 20%.

[0119] The hydrophilic material layer 31 is a water-soluble polyvinyl alcohol (PVA) film with a width of 90 mm and a mass per unit area of ​​35 g / m 2 The hydrophobic coating 32 is made of vaseline, has a width of 80 mm, and a mass per unit area of ​​8 g / m 2 .

[0120] like Figure 8 As shown, the water-dispersible surface layer 1 is provided with a guide groove; it includes a closed guide groove 11 and two open guide grooves 12; the closed guide groove 11 is annular and is arranged on the periphery of the water-dispersible surface layer 1; the open guide groove 12 is arc-shaped and is arranged in the closed area of ​​the closed guide groove 11.

[0121] like Fig.15 As shown, an adhesive coating area 41 is provided on the lower surface of the water-dispersible bottom layer 4. A pressure-sensitive adhesive layer 42 is provided in the adhesive coating area 41, wherein the pressure-sensitive adhesive is distributed in spaced strips. A coating protection pad is adhered to the pressure-sensitive adhesive layer 42; the coating protection pad is a water-soluble release paper.

[0122] Example 6

[0123] The difference between this embodiment and embodiment 5 is that, in this embodiment, Figure 5 As shown, the water-dispersible liquid-isolating layer 3 includes two hydrophilic material layers 31 and a hydrophobic material coating layer 32 disposed between the two hydrophilic material layers 31 .

[0124] Example 7

[0125] The difference between this embodiment and embodiment 1 is that in this embodiment, the water-dispersible surface layer 1 includes a hydrophilic layer with a thickness ratio of 1:1 and a water-repellent layer disposed above the hydrophilic layer. The unit area mass of the hydrophilic layer is 25 g / m 2 The raw material is a mixture of viscose fiber and coniferous wood pulp, the fiber length is 8mm, the linear density is 0.8dtex, the mass of viscose fiber in the hydrophilic layer accounts for 70%, and the viscose fiber has a circular cross-section; the unit area mass of the water-repellent layer is 20g / m 2 The raw material is a mixture of polylactic acid fiber, viscose fiber and coniferous wood pulp. The mass proportions of polylactic acid fiber and viscose fiber in the water-repellent layer are 50% and 20% respectively.

[0126] Example 8

[0127] The difference between this embodiment and embodiment 2 is that, in this embodiment, the adhesive coating area 41 is as follows: Fig.12 As shown, no water-soluble adhesive layer 43 is provided.

[0128] Example 9

[0129] The only difference between this embodiment and embodiment 2 is that, in this embodiment, the strip-shaped hydrophobic material 72 is a hydrophobic viscose fiber with a curling rate of 20%.

[0130] Comparative Example 1

[0131] The only difference between this comparative example and Example 1 is that in this comparative example, the water-dispersible liquid barrier layer 3 is not provided with a hydrophobic material coating 32 .

[0132] Comparative Example 2

[0133] The difference between this comparative example and Example 1 is that in this comparative example, in the water-dispersible liquid barrier layer 3 , the hydrophobic material coating 32 is disposed below the hydrophilic material layer 31 .

[0134] Test Case

[0135] The anti-leakage performance, flushability, anti-side leakage performance, and dryness during use (after absorbing water) of the sanitary napkins or panty liners of Examples 1 to 2, 7 to 9 and Comparative Examples 1 to 2 were tested as follows:

[0136] (1) Anti-leakage performance: Place an absorbent pad with a mass of m1 on a horizontal table; take a sanitary napkin or panty liner test sample and place it on the absorbent pad; apply 15 ml of simulated blood to the middle part of the surface layer of the sanitary napkin three times, 5 ml each time, with an interval of 5 minutes between two applications; wait for 5 minutes after the application of simulated blood, remove the sanitary napkin test sample above the absorbent pad, and weigh the absorbent pad, recorded as m2; the leakage amount m = m2-m1, and the value of m is used to represent the anti-leakage performance of the sanitary napkin or panty liner, where a value of m greater than 0 indicates leakage.

[0137] (2) Flushability: Test according to the shaking box decomposition test in GB / T 40181-2021 Flushability test method and evaluation of disposable sanitary nonwoven materials, and record the decomposition percentage of the sample.

[0138] (3) Dryness during use: Place the sample to be tested on a horizontal table. Use a pipette to accurately take 5 ml of simulated blood. Allow the liquid to flow freely onto the surface of the sample at a vertical distance of 5 to 10 mm between the center of the pipette tip and the center of the sample surface. Time for 5 minutes. Quickly place a medium-speed qualitative filter paper of 120 mm × 150 mm and weighing m1 (preferably the top layer of filter paper has no liquid absorbed) on the surface of the sample. At the same time, press a standard pressure block with a diameter of 100 mm and a weight of 1.2 kg on the filter paper. After 1 minute, quickly remove the pressure block and use a balance to weigh the mass m2 of the filter paper on the sample. The back-seepage amount m = m2-m1. The value of m is used to represent the dryness of the sanitary napkin or panty liner.

[0139] (4) Anti-side leakage performance: Place an absorbent pad of 300 mm × 300 mm and mass m1 on an inclined plane with an angle of 10° to the horizontal plane; take a sanitary napkin test sample and place it on the absorbent pad, with the side edge of the sanitary napkin parallel to the horizontal plane; use a pipette to accurately take 10 ml of simulated blood, and let the liquid flow freely onto the surface of the sample at a vertical distance of 5 to 10 mm between the center point of the pipette mouth and the center point of the sample surface; wait for 5 minutes after the application of simulated blood, remove the sanitary napkin test sample on the absorbent pad, and weigh the absorbent pad, recorded as m2; the side leakage amount m = m2-m1, and the value of m is used to represent the anti-leakage performance of the sanitary napkin or panty liner, where a value of m greater than 0 indicates side leakage.

[0140] The test results are shown in Table 1.

[0141] Table 1

[0142]

[0143] Analyzing the data in Table 1, we can see that:

[0144] (1) Compared with Comparative Example 1, Example 1 has better anti-leakage performance, and its flushability is comparable to that of Comparative Example 1. This shows that by providing a hydrophobic material coating on the hydrophilic material layer, the anti-leakage performance of the sanitary napkin can be effectively improved without causing too much impact on its flushability. The reason is that the hydrophobic material coating can use its strong water repellency to prevent menstrual blood from leaking to the bottom layer; after being thrown into the toilet, the hydrophilic material layer disperses or dissolves in the water, and the hydrophobic material coating attached to its surface will detach from it. The discrete hydrophobic material has low strength and is easily broken and dispersed in water.

[0145] (2) Compared with placing the hydrophobic coating below the hydrophilic layer (Comparative Example 2), placing it above the hydrophilic layer (Example 1) can make the sanitary napkin more flushable after use. The reason is that when the hydrophobic coating is located below the hydrophilic layer, during storage and use, since there is no PVA coating between the water-dispersible bottom layer and the hydrophobic coating, the hydrophobic coating will slowly penetrate into the water-dispersible bottom layer, thereby reducing the wettability of the water-dispersible bottom layer, and ultimately causing the material to have poor flushability.

[0146] (3) Compared with the case where only a hydrophilic layer is provided on the surface layer (Example 1), the case where a water-repellent layer is provided on the hydrophilic layer (Example 7) can make the surface layer of the sanitary napkin drier during use, and the flushability is comparable to that of Example 1. The reason is that: during use, the difference in hydrophilicity between the water-repellent layer and the hydrophilic layer can accelerate the penetration of liquid into the hydrophilic layer, which is beneficial for keeping the surface of the sanitary napkin dry; after being thrown into the toilet, the hydrophilic layer is easily dispersed in water, which can promote the dispersion of the water-repellent layer compounded on its surface, thereby making the sanitary napkin and panty liner have better flushability.

[0147] (4) Compared with Example 8, Example 2 provides a water-soluble adhesive layer between the bottom layer and the pressure-sensitive adhesive layer, which can make the sanitary napkin more flushable. The reason is that when the sanitary napkin is thrown into water, the water-soluble adhesive layer dissolves, which can separate the pressure-sensitive adhesive from the bottom layer, thereby greatly reducing the influence of the pressure-sensitive adhesive on the flushability of the bottom layer.

[0148] (5) Compared with Example 1, Example 2 has a leakproof partition on the surface layer, which has a better side leakage prevention function. The reason is that the hydrophobic fibers of the leakproof partition can effectively prevent liquid from flowing to the two sides of the sanitary napkin, thus having a good leakproof effect.

[0149] (6) Compared with Example 2, Example 9 has poor flushability. This indicates that when the curl rate of the strip hydrophobic material in the leak-proof partition is too high, the flushability of the sanitary napkin will be poor. The reason is that when the fiber curl rate is too high, it will affect the contact between water and the soluble fixing line after being thrown into the toilet, resulting in poor flushability of the leak-proof partition.

[0150] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A flushable and fully degradable sanitary napkin or panty liner, characterized in that: It comprises a water-dispersible surface layer, a water-dispersible absorption layer, a water-dispersible liquid barrier layer and a water-dispersible bottom layer which are arranged in sequence from top to bottom and all made of degradable materials; the water-dispersible liquid barrier layer comprises at least one hydrophilic material layer and at least one hydrophobic material coating layer; at least one side of each hydrophobic material coating layer is in contact with a hydrophilic material layer; the width of the water-dispersible absorption layer is not greater than the width of the water-dispersible bottom layer; both sides of the water-dispersible surface layer are provided with leak-proof edges; the leak-proof edges comprise at least one group of water-soluble fixed lines whose length direction is consistent with the length direction of the leak-proof edges, and a plurality of strip-shaped hydrophobic materials fixed in the water-soluble fixed lines and whose length direction is consistent with the width direction of the leak-proof edges; one end of the strip-shaped hydrophobic material close to the center of the water-dispersible surface layer is not fixed in the water-soluble fixed line.

2. The sanitary napkin or panty liner according to claim 1, characterized in that: The water-dispersible liquid-isolating layer comprises a hydrophilic material layer and a hydrophobic material coating layer, wherein the hydrophobic material coating layer is arranged on the hydrophilic material layer.

3. The sanitary napkin or panty liner according to claim 1, characterized in that: The water-dispersible liquid-isolating layer comprises two hydrophilic material layers and a hydrophobic material coating layer, wherein the hydrophobic material coating layer is arranged between the two hydrophilic material layers.

4. The sanitary napkin or panty liner according to any one of claims 1 to 3, characterized in that: The width of the hydrophobic material coating layer is smaller than the width of the hydrophilic material layer; the width of the hydrophobic material coating layer is larger than the width of the water-dispersible absorption layer.

5. The sanitary napkin or panty liner according to claim 1, characterized in that: The water-dispersible surface layer includes a hydrophilic layer and a water-repellent layer disposed above the hydrophilic layer.

6. The sanitary napkin or panty liner according to claim 1, characterized in that: At least one adhesive coating area is provided on the lower surface of the water-dispersible bottom layer; a water-soluble adhesive layer and a pressure-sensitive adhesive layer are provided in the adhesive coating area; the upper surface of the water-soluble adhesive layer contacts the lower surface of the water-dispersible bottom layer; and the upper surface of the pressure-sensitive adhesive layer contacts the lower surface of the water-soluble adhesive layer.

7. The sanitary napkin or panty liner according to claim 6, characterized in that: The area of ​​the pressure-sensitive adhesive layer is smaller than that of the water-soluble adhesive layer.

8. The sanitary napkin or panty liner according to claim 1, characterized in that: The strip-shaped hydrophobic material is hydrophobic fiber or hydrophobic yarn; the curling rate of the strip-shaped hydrophobic material is 5-15%.

9. The sanitary napkin or panty liner according to claim 8, characterized in that: A flow-guiding layer is arranged between the water-dispersible surface layer and the water-dispersible absorption layer; a plurality of flow-guiding holes are arranged in the flow-guiding layer.

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