An adaptive, leak-proof sanitary napkin

Abstract

The application discloses a self-adaptive close-fitting leakage-proof sanitary towel, which comprises a liquid-permeable surface layer, an absorption core and a leakage-proof bottom film; the absorption core is divided into a central rigid area and flexible foldable areas symmetrically arranged on the left and right sides of the central rigid area along the width direction; the stiffness of the central rigid area is greater than that of the flexible foldable areas, and the softness of the flexible foldable areas is greater than that of the central rigid area. The central rigid area is always flat, does not arch and does not wrinkle under the transverse clamping pressure, the core absorption area continuously adheres to the vulva area, and the side leakage channels or spaces formed due to wrinkles are fundamentally eliminated; the flexible foldable areas on the two sides can produce controllable folding according to the actual crotch width of a user, so that the same product can be simultaneously adapted to people with different body types, such as wide crotch, narrow crotch, obesity and slimness, and in particular, the side leakage pain points of people with narrow crotch, obesity and slimness are solved.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene products technology, and in particular to an adaptive, leak-proof sanitary napkin. Background Technology

[0002] To alleviate side leakage and discomfort, the industry typically adopts the following measures: First, increasing the rate of liquid seepage to reduce the time menstrual blood stays on the surface; second, adding leak-proof side panels to physically block lateral leakage; third, widening the product to cover more of the crotch area; and fourth, improving the overall stiffness of the product to resist compression deformation.

[0003] However, practice has shown that while increasing the seepage rate and adding leak-proof sidewalls have some effect, they lead to a significant increase in costs and a more complex product structure. On the other hand, widening the product and increasing its stiffness will exacerbate the squeezing wrinkles and hard edges, making it easier for the core absorption area to detach from the body, and thus failing to fundamentally solve the contradiction between side leakage and comfort.

[0004] Therefore, through beneficial exploration and research, the applicant has found a solution to the above problems, and the technical solution to be introduced below is the result of this research. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an adaptive, close-fitting, leak-proof sanitary napkin that can conform to the clamping mechanics of the human crotch area, guide controllable deformation during use, and keep the core area flat and close to the body.

[0006] The technical problem to be solved by this invention can be achieved by the following technical solution: An adaptive, leak-proof sanitary napkin includes a liquid-permeable surface layer, an absorbent core, and a leak-proof bottom film; the absorbent core is divided along its width into a central rigid zone and flexible foldable zones symmetrically arranged on the left and right sides of the central rigid zone; the stiffness of the central rigid zone is greater than that of the flexible foldable zones, and the softness of the flexible foldable zones is greater than that of the central rigid zone.

[0007] In a preferred embodiment of the present invention, the central rigid region is a strip structure that runs through the entire length direction, or it is only provided in the key absorption area along the length direction of the absorption core.

[0008] In a preferred embodiment of the present invention, the flexible foldable area is controllably folded upward or inward when subjected to lateral clamping pressure, and the folds generated by the folding are confined within the flexible foldable area.

[0009] In a preferred embodiment of the present invention, the lateral width of the central rigid zone is 35mm to 45mm.

[0010] In a preferred embodiment of the present invention, the lateral width of the central rigid zone is 40 mm.

[0011] In a preferred embodiment of the present invention, a rigid sheet is provided in the central rigid region, and the rigid sheet is located below, in the middle or above the absorbent core.

[0012] In a preferred embodiment of the present invention, the rigid sheet is a plastic sheet or an elastomer sheet, the rigid sheet has through holes for liquid to pass through, and the rigid sheet is a continuous strip or short segments arranged at intervals along the length direction.

[0013] In a preferred embodiment of the present invention, the absorbent core is an integral structure formed by vacuum forming a drum from fluff pulp and superabsorbent resin, the density of the central rigid region is greater than the density of the flexible foldable region, and the flexible foldable region has a fluffy and soft structure.

[0014] In a preferred embodiment of the present invention, the absorbent core is a combined structure, including a lower absorbent layer and an upper absorbent body. The upper absorbent body is only disposed in the middle of the width direction of the lower absorbent layer. The middle part of the lower absorbent layer and the upper absorbent body together form a central rigid area, and the left and right sides of the lower absorbent layer form a flexible foldable area.

[0015] In a preferred embodiment of the present invention, the central rigid region and the flexible foldable region are integrally formed as a whole structure, or are compositely connected by adhesive or hot pressing.

[0016] The adaptive, leak-proof sanitary napkin with the above structure has the following advantages compared with existing conventional sanitary napkins: 1. The central rigid area of ​​the present invention remains flat, does not arch, and does not wrinkle under lateral clamping pressure, and the core absorption area is continuously attached to the vulvar area, fundamentally eliminating the side leakage channels or spaces formed by wrinkles.

[0017] 2. The flexible foldable areas on both sides of the present invention can fold controllably according to the user's actual crotch width, so that the same product can be adapted to people of various body types such as wide crotch, narrow crotch, obese, and petite, especially solving the side leakage problem of people with narrow crotch, obese, and petite.

[0018] 3. Because the folding of this invention is controllable and concentrated in the non-core areas on both sides, it avoids the foreign body sensation caused by hard edge compression and wrinkles, while reducing mucosal friction on areas such as the labia minora, significantly improving the comfort of use.

[0019] 4. The present invention has a simple structure and can be realized by online integrated molding or prefabrication assembly molding. It requires little modification to existing production lines, has controllable costs, and is easy to industrialize and promote. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a plan view of the standard structure of the present invention, which is characterized by a strong central support and flexible side (through-type).

[0022] Figure 2 yes Figure 1 A sectional view along line AA.

[0023] Figure 3 This is a planar schematic diagram of the central stiff and side flexible (partial type) of the present invention.

[0024] Figure 4 This is a cross-sectional schematic diagram of the rigid sheet structure (the rigid sheet is placed inside the core) used in this invention.

[0025] Figure 5 This is a cross-sectional schematic diagram of the integrated core structure adopted in this invention.

[0026] Figure 6 This is a cross-sectional schematic diagram of the combined core structure used in this invention.

[0027] Figure 7 This is a schematic diagram comparing the deformation of the product of this invention and a conventional product under lateral pressure. The left side shows the conventional structure, and the right side shows the structure of this invention. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0029] See Figure 1 and Figure 2 The image shows an adaptive, leak-proof sanitary napkin, comprising a liquid-permeable surface layer 100, an absorbent core 200, and a leak-proof bottom film 300.

[0030] The absorbent core 200 is divided along its width into a central rigid zone 210 and symmetrically arranged flexible foldable zones 220 on both sides of the central rigid zone 210. The central rigid zone 210 has a greater resistance to compression deformation than the flexible foldable zones 220, while the flexible foldable zones 220 are softer than the central rigid zone 210. During use, when the legs apply lateral clamping pressure to the sanitary napkin, the central rigid zone 210 remains flat and close to the body due to its higher resistance to compression deformation, while the flexible foldable zones 220 on both sides undergo controlled folding due to their higher softness (see [reference]). Figure 7 (As shown on the right), thus adapting to the crotch width of different users, avoiding arching, wrinkling or twisting of the core absorption area, effectively preventing side leakage and improving comfort.

[0031] The following descriptions, in conjunction with the accompanying drawings, illustrate several specific implementation methods of the absorption core 200.

[0032] Implementation Method 1 (Based on Rigid Sheet Structure) See Figure 4 In this embodiment, the absorbent core 200a includes a central rigid region 210a and two flexible, foldable regions 220a on both sides. A rigid sheet 230a is disposed within the central rigid region 210a. The rigid sheet 230a is located below, in the middle, or above the absorbent core 200. The rigid sheet 230a is a plastic sheet or an elastomer sheet, preferably a plastic sheet. A through hole (not shown in the figure) is formed on the rigid sheet 230a for liquid to pass through. The rigid sheet 230a can be a continuous structure or a discontinuously arranged chopped structure.

[0033] In this embodiment, the lateral width of the central rigid region 210a is 35mm to 45mm, preferably 40mm. The central rigid region 210a has a strip-like structure that runs through the entire length direction (e.g., ...). Figure 1 (as shown), or only set in the key absorption area along the length direction of the absorption core 200a (such as... Figure 2 (As shown). The flexible foldable areas 220a on both sides do not contain rigid sheets and are soft in texture. When subjected to lateral clamping pressure, they can be folded upward or inward in a controllable manner, and the folds generated by folding are confined within the flexible foldable areas 220a and will not cause the central rigid area 210a to deform.

[0034] Implementation Method 2 (One-piece molded core structure) See Figure 5In this embodiment, the absorbent core 200b is a one-piece molded structure. The absorbent core 200b is integrally molded from fluff pulp and superabsorbent polymer (SAP) using a vacuum forming drum to form a monolithic structure. During the molding process, the material distribution and compaction degree in different areas are controlled by a partitioned mold. Specifically, a one-piece molded high-rigidity section is configured in the central rigid area 210b, where a relatively large amount of absorbent material is placed, and a high compaction pressure is applied to achieve a high density and high resistance to extrusion deformation. On both sides, flexible foldable areas 220b are configured with one-piece molded low-rigidity sections, where a relatively small amount of absorbent material is placed, and a lower compaction pressure or even no compaction is applied to maintain a fluffy and soft structure. The resulting absorbent core 200b has a higher density in its central rigid area 210b (i.e., the one-piece molded high-rigidity section) than in its flexible foldable area 220b (i.e., the one-piece molded low-rigidity section), resulting in a fluffy and soft structure in the flexible foldable area 220b.

[0035] The transverse width of the central rigid zone 210b is 35mm to 45mm, preferably 40mm. The central rigid zone 210b can be a continuous structure (e.g., Figure 1 (As shown), or it can be a local structure located only in the central core area (such as...) Figure 2 (As shown). The flexible foldable areas 220b on both sides fold controllably under lateral pressure, while the central rigid area 210b remains flat. This embodiment achieves functional differentiation between the central rigid area and the flexible foldable area without the need for additional rigid sheets, and the entire absorbent core 200b is a seamless, integrated structure with structural stability and simple manufacturing process.

[0036] Implementation Method 3 (Combined Core Structure) See Figure 6 In this embodiment, the absorbent core 200c is a composite structure, including a lower absorbent layer 230c and an upper absorbent layer 240c. The lower absorbent layer 230c can be made of prefabricated materials, such as absorbent paper, cleanroom paper, composite cores, etc., or it can be formed by vacuum forming of fluff pulp and SAP to form a thin bottom absorbent layer. The upper absorbent layer 240c can also be made of prefabricated absorbent materials (such as absorbent paper, cleanroom paper, or composite absorbent materials) or a fluff pulp + SAP vacuum forming structure. The upper absorbent layer 240c is only located in the middle of the width direction of the lower absorbent layer 230c. The portion of the lower absorbent layer 230c corresponding to the upper absorbent layer 240c together with the upper absorbent layer 240c forms a central rigid area 210c, and the left and right sides of the lower absorbent layer 230c form a flexible foldable area 220c.

[0037] The transverse width of the central rigid zone 210c is 35mm to 45mm, preferably 40mm. The central rigid zone 210c can be a continuous structure along its length (e.g., ...). Figure 1 As shown), it can also be set only in the central core area (such as...). Figure 2 (As shown). The flexible foldable area 220c, due to having only a single, fluffy lower absorbent layer 230c, has high flexibility and can fold upwards or inwards in a controlled manner under lateral clamping pressure, with the folds concentrated within the flexible foldable area 220c. The lower absorbent layer 230c and the upper absorbent layer 240c are bonded together by adhesive or hot pressing to form an integral absorbent core.

[0038] Based on the above embodiments, regardless of whether a rigid sheet structure, a one-piece molded core, or a combined core is used, the central rigid area and the flexible foldable area can be combined to form an integral absorbent core in the following ways: For one-piece molded structures (such as...) Figure 5 As shown), the two are integrally formed structures; for combined structures (such as... Figure 6 As shown in the figure, the two are connected by adhesive or thermoforming. Regardless of the connection method, a reliable bond between the central rigid area and the flexible foldable area can be guaranteed during use, and delamination or misalignment will not occur due to folding.

[0039] See Figure 7 , Figure 7 The left side shows a schematic diagram of the deformation of a conventional structure under lateral pressure. It can be seen that the entire core undergoes disordered arching and random wrinkling, and the core absorption area separates from the body, forming a lateral leakage channel. Figure 7 The right side shows a schematic diagram of the deformation of the structure of this invention under lateral pressure. When the actual width of the user's crotch space is greater than or equal to the total width of the absorbent core of the sanitary napkin, the product can be laid flat on the vulva, and the flexible foldable areas 220 on both sides do not fold or only bend slightly. When the actual width of the user's crotch space is less than the total width of the sanitary napkin, under the lateral clamping pressure of the legs, the central rigid area 210 is difficult to bend due to its high resistance to compression deformation. The pressure causes the flexible foldable areas 220 on both sides to fold upwards or inwards in a controlled manner. The folds produced by the folding are completely confined within the flexible foldable area 220 and will not be transmitted to the central rigid area 210. Therefore, the central rigid area 210 always remains flat and close to the body, and the core absorbent area is closely attached to the vulva. Menstrual blood is timely and controllably guided into the absorbent core 200, avoiding the formation of side leakage channels. At the same time, because the flexible foldable area 220 is soft, its folding will not produce hard edges or a foreign body sensation, nor will it cause friction and stimulation to sensitive areas such as the labia minora.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive, leak-proof sanitary napkin, comprising a liquid-permeable surface layer, an absorbent core, and a leak-proof bottom film; characterized in that, The absorbent core is divided into a central rigid region and flexible foldable regions symmetrically arranged on the left and right sides of the central rigid region along its width; the stiffness of the central rigid region is greater than that of the flexible foldable region, and the softness of the flexible foldable region is greater than that of the central rigid region.

2. The adaptive, leak-proof sanitary napkin according to claim 1, characterized in that, The central rigid region is a strip-shaped structure that runs through the entire length of the core, or it may be located only in the key absorption area along the length of the core.

3. The adaptive, leak-proof sanitary napkin according to claim 1, characterized in that, The flexible foldable area can be controllably folded upward or inward when subjected to lateral clamping pressure, and the resulting folds are confined within the flexible foldable area.

4. The adaptive, leak-proof sanitary napkin according to claim 1, characterized in that, The lateral width of the central rigid zone is 35mm to 45mm.

5. The adaptive, leak-proof sanitary napkin according to claim 4, characterized in that, The lateral width of the central rigid zone is 40mm.

6. The adaptive, leak-proof sanitary napkin according to any one of claims 1 to 5, characterized in that, A rigid sheet is provided in the central rigid zone, and the rigid sheet is located below, in the middle or above the absorption core.

7. The adaptive, leak-proof sanitary napkin according to claim 6, characterized in that: The rigid sheet is a plastic sheet or an elastomer sheet, and the rigid sheet has through holes for liquid to pass through. The rigid sheet is a continuous long strip or short segments arranged at intervals along its length.

8. The adaptive, leak-proof sanitary napkin according to any one of claims 1 to 5, characterized in that, The absorbent core is an integral structure formed by vacuum forming a drum from fluff pulp and superabsorbent resin. The density of the central rigid area is greater than the density of the flexible foldable area, which has a fluffy and soft structure.

9. The adaptive, leak-proof sanitary napkin according to any one of claims 1 to 5, characterized in that, The absorbent core is a combined structure, including a lower absorbent layer and an upper absorbent body. The upper absorbent body is only disposed in the middle of the width direction of the lower absorbent layer. The middle part of the lower absorbent layer and the upper absorbent body together form a central rigid area. The left and right sides of the lower absorbent layer form a flexible foldable area.

10. The adaptive, leak-proof sanitary napkin according to claim 1, characterized in that, The central rigid area and the flexible foldable area are integrally formed structures, or are compositely connected by adhesive or hot pressing.

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