An absorbent article

Abstract

This invention discloses an absorbent article, relating to the field of hygiene product technology. A specific embodiment of the absorbent article includes: a skin-friendly layer, a diffusion layer, an absorbent core, and a leak-proof bottom layer arranged sequentially along its height. The absorbent core includes a central region and side regions located on both sides of the central region along its length. The number of layers in the side regions is greater than that in the central region, thus forming a physical liquid storage space in the central region of the absorbent core. In this embodiment, the number of layers in the side regions of the absorbent core is greater than that in the central region. Because the sides of the absorbent core are higher than the central region, a physical liquid storage space is formed in the central region of the absorbent core. During use, this helps liquid to quickly seep into the physical liquid storage space and be absorbed, and also prevents liquid from seeping out to the sides. Because there is a certain physical space between the skin-friendly layer and the absorbent core, liquid leakage caused by compression within the absorbent core is reduced, thereby improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, and more particularly to an absorbent article. Background Technology

[0002] Absorption rate and leak-proof performance are key performance indicators that users care about when using absorbent products. However, most existing absorbent cores are made of a single layer of wood pulp absorbent powder structure manufactured online or a single or multiple layers of prefabricated cores laid flat together. Because the layers of materials are fixed by hot melt adhesive, the additional liquid storage space is limited. During use, the liquid cannot be absorbed quickly, which can easily lead to side leakage or a damp feeling, causing discomfort to the user. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide an absorbent article. By setting the number of layers in the side region of the absorbent core to be greater than that in the middle region, since the two sides of the absorbent core are higher than the middle, the middle region of the absorbent core forms a physical liquid storage space. During use, this helps the liquid to quickly seep into the physical liquid storage space and be absorbed. In addition, the height difference between the two sides and the middle of the absorbent core can also prevent the liquid from seeping out to the sides. After the liquid is completely absorbed, because there is a certain physical space between the skin-friendly layer and the middle region of the absorbent core, the liquid seepage caused by compression within the absorbent core can be reduced, thereby improving the user experience.

[0004] To achieve the above objectives, embodiments of the present invention provide an absorbent article comprising: a skin-friendly layer, a diffusion layer, an absorbent core, and a leak-proof bottom layer arranged sequentially along the height direction. The absorbent core includes a central region and side regions located on both sides of the central region along its length direction. The side regions have more layers than the central region, thereby forming a physical liquid storage space in the central region of the absorbent core.

[0005] Optionally, the absorbent core includes a cover layer and a main absorbent layer located inside the cover layer. The two sides of the main absorbent layer are folded towards the center and fixed, so that the number of layers in the side region is greater than that in the central region.

[0006] Optionally, the two sides of the main absorption layer are double-layer or multi-layer structures, and the middle of the main absorption layer is a single-layer structure.

[0007] Optionally, the main absorbent layer is a fluff pulp and absorbent powder mixture layer, the cover layer wraps the folded fluff pulp and absorbent powder mixture layer, and the two ends of the cover layer in the width direction form an overlapping area, which is fixed by hot melt adhesive.

[0008] Optionally, the width of the fluff pulp and absorbent powder mixture layer is 60mm to 240mm, the basis weight is 80gsm to 400gsm, and the proportion of absorbent powder is 0% to 50%. And / or, the covering layer is toilet paper, spunlace nonwoven fabric, spunbond nonwoven fabric, spunmelt nonwoven fabric, meltblown nonwoven fabric and / or hot air nonwoven fabric, the width of the covering layer is 110mm to 300mm, and the basis weight of the covering layer is 5gsm to 60gsm.

[0009] Optionally, the main absorbent layer is a non-woven fabric absorbent powder mixture layer, and the covering layer includes an upper covering layer and a lower covering layer. The lower covering layer wraps the folded non-woven fabric absorbent powder mixture layer, and the two ends of the lower covering layer in the width direction form open areas. The upper covering layer is fixed and sealed to the open areas by hot melt adhesive.

[0010] Optionally, the width of the nonwoven fabric absorbent powder mixing layer is 60mm to 240mm, wherein the nonwoven fabric basis weight is 30gsm to 80gsm, and the absorbent powder basis weight is 30gsm to 200gsm. And / or, the upper and lower cover layers are made of toilet paper, dust-free paper, spunlace nonwoven fabric, spunbond nonwoven fabric, spunmel and / or meltblown nonwoven fabric, the width of the upper cover layer is 40mm to 130mm, the width of the lower cover layer is 70mm to 260mm, and the basis weight of the upper and lower cover layers is 5gsm to 70gsm.

[0011] Optionally, the absorbent core is a prefabricated core, which is a single-layer structure integrally formed by wet process, airflow mesh formation or melt-blown process; or, the prefabricated core is a multi-layer structure made of multiple materials offline composite. And / or, the precast core has a basis weight of 60 gsm to 300 gsm.

[0012] Optionally, the prefabricated core includes a first folded area, which is disposed in the side region of the absorbent core, so that the number of layers in the side region of the absorbent core is greater than that in the middle region. Alternatively, the prefabricated core includes a first folded area and a second folded area, wherein the first folded area is located below the second folded area in the height direction of the absorbent core, and the width of the second folded area does not exceed the width of the first folded area.

[0013] Optionally, the skin-friendly layer is made of hot-air nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric and / or composite nonwoven fabric; the basis weight of the skin-friendly layer is 15 gsm to 70 gsm. And / or, the diffusion layer is a single-layer hot-air nonwoven fabric, a multi-layer hot-air nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, cleanroom paper, a composite cleanroom paper, and / or a woven core material; the basis weight of the single-layer hot-air nonwoven fabric, the multi-layer hot-air nonwoven fabric, the spunbond nonwoven fabric, or the spunlace nonwoven fabric is 15 gsm to 60 gsm, the basis weight of the cleanroom paper or composite cleanroom paper material is 30 gsm to 70 gsm, and the basis weight of the woven core material is 70 gsm to 200 gsm; And / or, the leak-proof bottom layer is made of PE film material and / or PE composite nonwoven fabric material; the basis weight of the leak-proof bottom layer is 10gsm to 50gsm.

[0014] One embodiment of the above invention has the following advantages or beneficial effects: The absorbent article includes: a skin-friendly layer, a diffusion layer, an absorbent core, and a leak-proof bottom layer arranged sequentially along the height direction. The absorbent core includes a central region and side regions located on both sides of the central region along its length direction. The number of layers in the side regions is greater than that in the central region, so that a physical liquid storage space is formed in the central region of the absorbent core. In this embodiment, by setting the number of layers in the side regions of the absorbent core to be greater than that in the central region, since the sides of the absorbent core are higher than the central region, a physical liquid storage space is formed in the central region of the absorbent core. During use, this helps the liquid to quickly seep into the physical liquid storage space and be absorbed. In addition, the height difference between the sides and the central region of the absorbent core can also prevent the liquid from seeping out to the sides. After the liquid is completely absorbed, because there is a certain physical space in the middle region between the skin-friendly layer and the absorbent core, the liquid seepage caused by compression in the absorbent core can be reduced, thereby improving the user experience.

[0015] The further effects of the aforementioned unconventional alternative methods will be explained below in conjunction with specific implementation methods. Attached Figure Description

[0016] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein: Figure 1 This is a longitudinal cross-sectional view of the absorbent article according to an embodiment of the present invention; Figure 2 This is a longitudinal cross-sectional view of the first structure of the absorber core according to an embodiment of the present invention; Figure 3 This is a longitudinal cross-sectional view of a second structure of the absorber core according to an embodiment of the present invention; Figure 4 This is a longitudinal cross-sectional view of a third structure of the absorber core according to an embodiment of the present invention.

[0017] Reference numerals: 100-Skin-friendly layer; 200-Diffusion layer; 300-Absorbent core; 400-Leak-proof bottom layer; 500-Physical liquid storage space; 310-Covering layer; 320-Main absorbent layer; 330-Upper cover layer; 340-Lower cover layer; 350-First folding area; 360-Second folding area. Detailed Implementation

[0018] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0019] It should be noted that in the description of this invention, the terms "left," "right," "up," "down," etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0020] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Absorption rate and leak-proof performance are key performance indicators that users care about when using absorbent products. However, most existing absorbent cores are made of a single layer of wood pulp absorbent powder structure manufactured online or a single or multiple layers of prefabricated cores laid flat together. Because the layers of materials are fixed by hot melt adhesive, the additional liquid storage space is limited. During use, the liquid cannot be absorbed quickly, which can easily lead to side leakage or a damp feeling, causing discomfort to the user.

[0022] In view of this, such as Figures 1 to 4 As shown, an embodiment of the present invention provides an absorbent article, comprising: a skin-friendly layer 100, a diffusion layer 200, an absorbent core 300, and a leak-proof bottom layer 400 arranged sequentially along the height direction. The absorbent core 300 includes a central region and side regions located on both sides of the central region along its length direction. The number of layers in the side regions is greater than that in the central region, so that a physical liquid storage space 500 is formed in the central region of the absorbent core 300.

[0023] In this embodiment, the height direction refers to the stacking direction perpendicular to the plane where the skin-friendly layer 100 and the leak-proof bottom layer 400 are located, the length direction refers to the direction of the long side extension of the absorbent product, and the width direction refers to the direction of the short side that intersects with the length direction.

[0024] This embodiment of the invention, through its structural design, allows the absorbent core 300 to exhibit a relatively lower central section and relatively higher sides in its overall thickness distribution. This creates an unfilled gap region between the diffusion layer 200 and the central region of the absorbent core 300, which serves as the physical liquid storage space 500. In actual use, the liquid first enters the diffusion layer 200 via the skin-friendly layer 100 and is conducted downwards under the influence of the diffusion layer 200. When the liquid reaches above the absorbent core 300, due to the physical liquid storage space 500 in the central region, the liquid can preferentially enter this space for temporary storage and further penetrate into the absorbent core 300 under the combined influence of gravity and capillary action, thereby achieving rapid reception and distribution of the liquid. Simultaneously, because the side regions have more layers than the central region, the side regions form structural protrusions relative to the central region, which somewhat obstruct the lateral diffusion of the liquid in the width direction, causing the liquid to tend to converge towards the central region and be absorbed downwards, reducing the possibility of liquid overflowing along the length direction.

[0025] The aforementioned structure is not limited to a single implementation. As long as the number of layers in the absorbent core 300 differs between the middle and the two sides along its length, a physical liquid storage space 500 can be formed above the middle region. For example, the middle region can have a relatively thinned structure relative to the side regions, or the side regions can have a relatively thickened structure, or a combination of both can form a transitional structure, giving the absorbent core 300 a profile with a height difference in the width direction. In different embodiments, this difference in the number of layers can manifest as variations in the number of material layers, differences in the degree of structural compaction, or variations in local thickness, all of which can form a physical liquid storage space 500 for temporary liquid storage above the middle region.

[0026] The absorbent article of this invention can construct a stable physical liquid storage space 500 between the absorbent core 300 and the diffusion layer 200 without significantly increasing the amount of material used. On the one hand, this physical liquid storage space 500 can provide buffering and temporary storage functions when liquid is instantaneously introduced, allowing the liquid to quickly leave the surface of the skin-friendly layer 100 and improving surface dryness. On the other hand, the liquid is redistributed within the physical liquid storage space 500 before entering the absorbent core 300, which helps to improve the overall absorption and utilization efficiency. At the same time, the structural difference between the side region and the central region can also limit the lateral migration of liquid, thereby reducing the risk of side leakage to a certain extent and improving the user comfort of the absorbent article.

[0027] like Figure 1 and Figure 2 As shown, the absorbent core 300 includes a cover layer 310 and a main absorbent layer 320 located inside the cover layer 310. The two sides of the main absorbent layer 320 in the length direction are folded towards the middle and fixed, so that the number of layers in the side region is greater than that in the middle region.

[0028] In this embodiment, the absorbent core 300 includes a cover layer 310 and a main absorbent layer 320 located inside the cover layer 310. The main absorbent layer 320 is folded and fixed towards the center on both sides along its width direction, thereby forming a stacked structure with more layers in the folded side areas, while the central area remains a structure with relatively fewer layers. This results in a structure where the number of layers in the side areas is greater than that in the central area. Through the above structural arrangement, the absorbent core 300 presents a cross-sectional profile with a relatively low center and relatively high sides, creating an incompletely filled gap space between the cover layer 310 and the main absorbent layer 320 in the central area. This gap space corresponds to the formation of a physical liquid storage space 500.

[0029] In a specific implementation, the main absorbent layer 320 can be covered or supported by the cover layer 310 after folding. The cover layer 310 is used to limit and fix the folded structure to ensure its stability during use. The folded structure can maintain its stacked state through bonding, pressing, or other fixing methods, so that the two side regions form a relatively stable multi-layered structure, thereby continuously maintaining the difference in the number of layers between the central region and the side regions. Through this difference in the number of layers, on the one hand, a physical liquid storage space 500 is formed above the central region, and on the other hand, the side regions form a relatively protruding structure, thereby guiding and restricting the lateral migration of the liquid during liquid conduction.

[0030] In other alternative embodiments, the cover layer 310 can be a single-layer structure or a layered structure formed by combining multiple materials to provide different support and covering properties. The main absorbent layer 320 can also be a single absorbent material layer or a structure formed by combining multiple absorbent materials, both of which can form a difference in the number of layers between the side and central regions after folding. Alternatively, the two sides of the main absorbent layer 320 can be double-layered or multi-layered structures, while the center of the main absorbent layer 320 can be a single-layered structure. Furthermore, the folding method is not limited to symmetrical folding; asymmetrical folding is also possible, as long as a difference in the number of layers between the center and the sides can be formed structurally, the technical effects of the present invention can be achieved. In a further embodiment, the folding of the main absorbent layer 320 can be completed online through a continuous process, or it can be pre-treated before being combined with the cover layer 310 to form an absorbent core 300 with structural features.

[0031] like Figure 2 As shown, the main absorbent layer 320 is a mixture of fluff pulp and absorbent powder, and the cover layer 310 wraps the folded fluff pulp and absorbent powder mixture. The two ends of the cover layer 310 in the width direction form an overlapping area, which is fixed by hot melt adhesive.

[0032] Specifically, the fluff pulp and absorbent powder mixture layer forms a structure with different numbers of layers after folding. The covering layer 310 covers it, so that the folded structure is confined inside the covering layer 310, preventing it from loosening or shifting during use. At the same time, the overlapping areas formed at both ends of the covering layer 310 are bonded with hot melt adhesive, so that the covering structure forms a closed or semi-closed structure, thereby further improving the overall integrity and structural strength of the absorbent core 300.

[0033] In this structure, the fluff pulp and absorbent powder mixture layer serves as the main absorbent layer, enabling rapid absorption and retention of incoming liquid. The difference in the number of layers created by folding establishes a structural difference between the central and side regions. The covering layer 310, while encasing the folded main absorbent layer 320, forms an unfilled space above the central region and between it and the diffusion layer 200, thus constituting a physical liquid storage space 500. This physical liquid storage space 500 acts as a buffer and temporary storage when liquid initially enters, allowing the liquid to preferentially leave the surface of the skin-friendly layer 100 and enter the absorbent core 300, thus improving surface dryness.

[0034] In other embodiments, the covering layer 310 can be a completely enclosed structure or a partially enclosed structure. As long as an overlapping area can be formed and fixed with hot melt adhesive, effective constraint on the folded structure can be achieved. The overlapping area can be continuously arranged along the length direction or consist of multiple bonded areas spaced apart, thereby ensuring structural stability while also taking into account flexibility and breathability. In addition, the hot melt adhesive can be applied in a continuous, dotted, or linear manner to adapt to different process requirements and performance requirements.

[0035] Through the above structural design, the absorbent core 300, while achieving stable coverage of the main absorbent layer 320, can maintain the layered structure formed by folding over a long period of time. This prevents the physical liquid storage space 500 from collapsing or disappearing during use, thus ensuring a stable temporary storage and flow path for the liquid upon initial entry. Simultaneously, the overlapping areas formed by the hot-melt adhesive fixing at both ends of the cover layer 310 reinforce the overall structure, reducing the risk of displacement of the absorbent material under pressure or movement, and contributing to improved product reliability. Furthermore, this structure achieves rapid liquid introduction, effective absorption, and lateral confinement without significantly increasing material usage, thereby comprehensively improving absorption efficiency, leak-proof performance, and wearing comfort.

[0036] Optionally, the width of the fluff pulp and absorbent powder mixture layer is 60mm to 240mm, the basis weight is 80gsm to 400gsm, and the absorbent powder ratio is 0% to 50%; and / or, the cover layer 310 is toilet paper, spunlace nonwoven fabric, spunbond nonwoven fabric, spunmelt nonwoven fabric, meltblown nonwoven fabric and / or hot air nonwoven fabric, the width of the cover layer 310 is 110mm to 300mm, and the basis weight of the cover layer 310 is 5gsm to 60gsm.

[0037] By rationally setting the ratio and basis weight range of fluff pulp and absorbent powder, the main absorbent layer 320 maintains a certain degree of structural fluffiness and support while possessing good liquid absorption capacity. This facilitates the formation of a stable layered structure after folding and ensures the effective existence of a physical liquid storage space 500 above the central region. Within this range, a lower proportion of absorbent powder is beneficial for improving the liquid introduction speed and dispersion ability, while a higher proportion of absorbent powder is beneficial for improving the liquid's water-locking ability. By selecting different ratios, the comprehensive requirements for absorption speed and absorption capacity under different application scenarios can be met.

[0038] By selecting the material type and weight range of the cover layer 310, it is possible to effectively cover and support the folded main absorbent layer 320 without significantly affecting the overall structure's flexibility and breathability. A lower weight cover layer is beneficial for improving overall flexibility and fit, while appropriately increasing the weight can enhance the constraint on the internal structure, making the folded layered structure more stable, thus contributing to the long-term maintenance of the physical liquid storage space 500.

[0039] Furthermore, the width of the main absorbent layer 320 is smaller than the width of the cover layer 310, allowing the cover layer 310 to have a covering margin on both sides in the width direction. This enables a stable encapsulation structure to be formed after folding, and fixation is achieved through the overlapping area. This width difference design ensures that the main absorbent layer 320 remains completely covered by the cover layer 310 after folding, preventing the absorbent material from being exposed. It also provides conditions for forming the spatial structure of the central region, making the physical liquid storage space 500 easier to form and less prone to collapse. In different embodiments, the aforementioned width and weight ranges can be adjusted according to product size, absorption requirements, and usage scenarios. As long as the difference in the number of layers between the central and side regions is satisfied, and a stable physical liquid storage space 500 is formed above the central region, it falls within the protection scope of this invention.

[0040] By limiting the above parameter range, this embodiment achieves a balance between material usage and structural performance while ensuring absorption performance. This allows the absorbent core 300 to possess both excellent liquid absorption and retention capabilities, while maintaining a stable spatial shape through structural design. Consequently, when liquid enters, it can be quickly introduced and temporarily stored in the physical liquid storage space 500, and then gradually absorbed by the main absorbent layer 320, which helps improve instantaneous absorption efficiency and reduce surface backflow. Simultaneously, the effective coverage and support of the main absorbent layer 320 by the covering layer 310 ensures the overall structure remains stable under pressure or movement, thereby further improving the product's leak-proof performance and wearing comfort.

[0041] like Figure 3 As shown, the main absorbent layer 320 is a non-woven fabric water-absorbing powder mixture layer, and the cover layer 310 includes an upper cover layer 330 and a lower cover layer 340. The lower cover layer 340 wraps the folded non-woven fabric water-absorbing powder mixture layer, and the two ends of the lower cover layer 340 in the width direction form open areas. The upper cover layer 330 is fixed and sealed to the open areas by hot melt adhesive.

[0042] In this embodiment, this structural arrangement confines the folded nonwoven absorbent powder mixture layer within a closed space between the upper cover layer 330 and the lower cover layer 340, thereby forming a stable physical liquid storage space 500 in the central region. In this structure, the nonwoven absorbent powder mixture layer serves as the main absorption unit, forming a structure with varying numbers of layers after folding, resulting in different thickness distributions between the central and side regions of the absorbent core 300. The lower cover layer 340 wraps around the folded main absorbent structure, forming open areas at both ends. These open areas provide space for assembly and unfolding when unsealed, and form a completely closed structure after being sealed by the upper cover layer 330, effectively constraining the morphological stability of the internal absorbent material. The upper cover layer 330 is fixed to the open areas of the lower cover layer 340 with hot melt adhesive, forming a stable sandwich-like composite structure for the absorbent core 300, thus ensuring the continuous existence of the physical liquid storage space 500 during use.

[0043] In other embodiments, the sealing method of the upper cover layer 330 is not limited to continuous hot melt adhesive coating, but can also adopt dot coating or line coating to improve the overall softness and fit while ensuring the sealing effect; at the same time, the opening area of ​​the lower cover layer 340 can be a continuous opening structure or an intermittent opening structure to adapt to different processing technology and structural design requirements.

[0044] Through the above structural design, this embodiment enables the nonwoven absorbent powder mixture layer to be stably maintained between the upper cover layer 330 and the lower cover layer 340 after folding. The synergistic effect of the lower cover layer 340 and the upper cover layer 330 forms a stable closed structure, effectively maintaining the morphological stability of the physical liquid storage space 500. During liquid entry, the liquid can quickly pass through the skin-friendly layer 100 and the diffusion layer 200 into the absorbent core 300, temporarily distributed within the liquid storage space 500 in the central region, and then gradually absorbed by the nonwoven absorbent powder mixture layer, thereby improving instantaneous absorption capacity and reducing the risk of local oversaturation. Simultaneously, the structure of the upper cover layer 330 and the lower cover layer 340 can constrain the internal absorbent material, reducing material displacement or overflow under pressure, thereby improving the overall structural stability, leak-proof performance, and user comfort of the absorbent product.

[0045] Optionally, the width of the nonwoven fabric absorbent powder mixing layer is 60mm to 240mm, wherein the basis weight of the nonwoven fabric is 30gsm to 80gsm, and the basis weight of the absorbent powder is 30gsm to 200gsm; and / or, the upper cover layer 330 and the lower cover layer 340 are toilet paper, dust-free paper, spunlace nonwoven fabric, spunbond nonwoven fabric, spunmel and / or meltblown nonwoven fabric, the width of the upper cover layer 330 is 40mm to 130mm, the width of the lower cover layer 340 is 70mm to 260mm, and the basis weight of the upper cover layer 330 and the lower cover layer 340 is 5gsm to 70gsm.

[0046] By limiting the ratio and weight range of the nonwoven fabric substrate and absorbent powder, the nonwoven fabric-absorbent powder mixture layer can have good liquid absorption and storage capacity while ensuring structural strength. The nonwoven fabric serves as a supporting skeleton to maintain the structural stability after folding, while the absorbent powder provides rapid absorption and water-locking capacity. The synergistic effect of the two enables the absorbent core 300 to maintain stable absorption performance even after forming a structure with different number of layers, and is conducive to the continuous formation and maintenance of the physical liquid storage space 500 in the central region.

[0047] By setting the material type and parameter range of the upper cover layer 330 and the lower cover layer 340, the cover layer can effectively cover and encapsulate the internal non-woven absorbent powder mixture layer while taking into account softness, breathability and structural support performance, so that the absorbent core 300 can maintain structural stability under different stress conditions during use.

[0048] The width of the nonwoven absorbent powder mixing layer is smaller than the width of the lower cover layer 340, allowing the lower cover layer 340 to have a covering allowance on both sides in the width direction. This provides wrapping space for the folded structure and forms a stable closed structure after the upper cover layer 330 and the lower cover layer 340 are fitted together. Through this width difference design, the upper cover layer 330 can effectively seal the opening area of ​​the lower cover layer 340, so that the nonwoven absorbent powder mixing layer is stably confined between the upper cover layer 330 and the lower cover layer 340. This ensures the structural stability of the physical liquid storage space 500 and prevents the internal absorbent material from shifting outward or becoming unevenly distributed during use.

[0049] By setting the above parameter range and structural combination, this embodiment achieves a balance between structural stability and material utilization efficiency while ensuring absorption performance. This allows the absorbent core 300 to quickly guide and absorb liquid upon entry, forming a stable temporary storage space in the central region, namely the physical liquid storage space 500. This enhances instantaneous absorption capacity and reduces the risk of lateral leakage caused by local saturation. Simultaneously, the constraint effect of the upper cover layer 330 and lower cover layer 340 on the internal absorbent material effectively reduces deformation and displacement under pressure or movement, ensuring the product maintains good structural integrity and wearing comfort even under complex usage conditions.

[0050] like Figure 4 As shown, the absorbent core 300 is a prefabricated core, which is a single-layer structure integrally formed by wet process, airflow mesh formation or melt-blown process; or, the prefabricated core is a multi-layer structure made of multi-layer materials offline composite; and / or, the prefabricated core has a basis weight of 60gsm to 300gsm.

[0051] In this embodiment, the absorbent core 300 is a prefabricated core. The prefabricated core can be a single-layer structure integrally formed by wet molding, airflow web formation, or meltblown process, or it can be a multi-layer structure made from multiple materials through offline composite methods. By employing different molding processes to prepare the prefabricated core, the absorbent core 300 can be adjusted in terms of structural uniformity, bulkiness, and absorption performance according to different product requirements. The integrally formed structure is beneficial for obtaining an absorbent matrix with strong integrity and uniform pore distribution, while the multi-layer composite structure can achieve gradient absorption or zoned absorption effects through the combination of different layers of materials, thereby improving the distribution and retention capabilities of liquids.

[0052] The prefabricated core has a basis weight of 60 gsm to 300 gsm. By limiting the basis weight range, the prefabricated core can ensure basic absorption capacity while also taking into account softness and structural support. The lower basis weight prefabricated core has better softness and fit and faster liquid delivery, making it suitable for applications with high comfort requirements; while the higher basis weight prefabricated core has higher liquid absorption capacity and structural stability, making it suitable for applications with higher absorption requirements. Thus, the absorbent core 300 can adapt to different usage needs.

[0053] Furthermore, the prefabricated core can be pre-formed with different thickness distributions, so that it presents different structural densities or layer distributions between the central region and the side region, thereby providing basic structural conditions for the subsequent formation of the physical liquid storage space 500.

[0054] By setting the above-mentioned structure and parameter range, this embodiment enables the prefabricated core to have good adaptability under different molding processes, allowing the absorbent core 300 to maintain structural stability while possessing superior absorption and liquid storage performance. During liquid entry, the prefabricated core can quickly absorb and diffuse the liquid, and, in conjunction with the physical liquid storage space 500 in the central region formed by the structure, achieve temporary storage and redistribution, thereby improving overall absorption efficiency and reducing the risk of side leakage caused by local saturation, while enhancing the stability and comfort of the absorbent product under different usage conditions.

[0055] Optionally, the prefabricated core includes a first folded region 350, which is disposed in the side region of the absorbent core 300 so that the number of layers in the side region of the absorbent core 300 is greater than that in the middle region.

[0056] In this embodiment, the prefabricated core includes a first folded region 350, which is disposed on the side region of the absorbent core 300. By partially folding the prefabricated core, the side region forms a layered structure, resulting in a greater number of layers in the side region than in the central region. This structural arrangement creates a relatively thicker side and a relatively thinner central region in the overall thickness distribution of the absorbent core 300, thus forming a physical liquid storage space 500 above the central region, providing temporary storage and flow space for the liquid after it enters. In practical applications, the first folded region 350 can be disposed on one side region or symmetrically disposed on both sides to adapt to different structural design requirements. Furthermore, the first folded region 350 can be formed directly during the prefabricated core molding process or achieved through subsequent folding processes, thus balancing manufacturing flexibility and structural stability. The above structure allows liquid to preferentially converge towards the central region and penetrate downwards when entering the absorbent core 300, effectively improving instantaneous absorption capacity. Furthermore, the thickened structure of the side regions blocks the lateral diffusion of liquid, reducing the risk of side leakage and thus improving the overall dryness and comfort of the absorbent product.

[0057] like Figure 4 As shown, the prefabricated core includes a first folding area 350 and a second folding area 360. The first folding area 350 is located below the second folding area 360 in the height direction of the absorbent core 300, and the width of the second folding area 360 does not exceed the width of the first folding area 350.

[0058] In this embodiment, the prefabricated core forms a stepped, stacked structure in the height direction, thus giving the absorbent core 300 a gradually changing structural shape from bottom to top in the vertical space, which is beneficial for forming a stable physical liquid storage space 500 in the central region. The first folding area 350 and the second folding area 360 form a multi-layered composite structure through stacking or folding. The first folding area 350 serves as the lower support structure, providing a larger structural support area and load-bearing capacity, while the second folding area 360 serves as the upper structure, with a relatively smaller width, thus forming a gradually narrowing shape in the structure. The stacking difference in the height direction allows the absorbent core 300 to form a relatively empty area in the central region, providing temporary storage and buffering space for liquid to enter, thereby indirectly constituting the structural basis of the physical liquid storage space 500.

[0059] The first folding region 350 and the second folding region 360 can be constructed using material layers of different densities or absorbent materials of different weights, thereby further adjusting the absorption rate and liquid-locking capacity of different regions. This allows the upper structure to focus more on rapid flow conduction, while the lower structure focuses more on liquid storage and locking. Furthermore, the width variation of the second folding region 360 can be achieved not only through geometric reduction but also through local compression or material shrinkage, maintaining overall continuity while achieving differences in structural width, thus enhancing the gradual structural transition effect.

[0060] like Figure 1 As shown, the skin-friendly layer 100 is made of hot-air nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, and / or composite nonwoven fabric; the basis weight of the skin-friendly layer 100 is 15 gsm to 70 gsm; and / or, the diffusion layer 200 is made of single-layer hot-air nonwoven fabric, multi-layer hot-air nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, cleanroom paper, composite cleanroom paper, and / or woven core material; the basis weight of the single-layer hot-air nonwoven fabric, multi-layer hot-air nonwoven fabric, spunbond nonwoven fabric, or spunlace nonwoven fabric is 15 gsm to 60 gsm, the basis weight of the cleanroom paper or composite cleanroom paper material is 30 gsm to 70 gsm, and the basis weight of the woven core material is 70 gsm to 200 gsm; and / or, the leak-proof bottom layer 400 is made of PE film material and / or PE composite nonwoven fabric material; the basis weight of the leak-proof bottom layer 400 is 10 gsm to 50 gsm.

[0061] In this embodiment, the skin-friendly layer 100 is one or more of the following: hot-air nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, and / or composite nonwoven fabric. The basis weight of the skin-friendly layer 100 is 15 gsm to 70 gsm. By limiting the material type and basis weight range of the skin-friendly layer 100, it can achieve good softness and skin contact comfort while allowing liquids to quickly permeate and be guided downwards to the diffusion layer 200, thereby reducing the residence time of liquids on the surface and improving the dryness during use. At lower basis weights, the skin-friendly layer 100 has better softness and conformability, while at higher basis weights it has better structural integrity and durability, thus adapting to different usage scenarios.

[0062] The diffusion layer 200 can be one or more structures selected from single-layer hot-air nonwoven fabric, multi-layer hot-air nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, cleanroom paper, composite cleanroom paper, and / or woven core material. The basis weight of the single-layer hot-air nonwoven fabric, multi-layer hot-air nonwoven fabric, spunbond nonwoven fabric, or spunlace nonwoven fabric is 15 gsm to 60 gsm; the basis weight of the cleanroom paper or composite cleanroom paper material is 30 gsm to 70 gsm; and the basis weight of the woven core material is 70 gsm to 200 gsm. By setting the material type and basis weight range of the diffusion layer 200, it can play a role in rapid flow guidance and lateral diffusion in the absorbent product, uniformly distributing the incoming liquid in the planar direction. This avoids the risk of leakage caused by rapid saturation in local areas and provides more uniform liquid input conditions for the absorbent core 300.

[0063] The leak-proof backing layer 400 is made of PE film material and / or PE composite nonwoven fabric material, with a basis weight of 10gsm to 50gsm. This structural design allows the leak-proof backing layer 400 to maintain a certain level of flexibility while possessing excellent barrier properties, effectively preventing liquid leakage. The PE film material provides high liquid barrier capacity, while the PE composite nonwoven fabric material further enhances overall breathability and wearing comfort while ensuring barrier performance, achieving a balance between leak prevention and comfort in the absorbent product.

[0064] The skin-friendly layer 100, diffusion layer 200, and leak-proof bottom layer 400 work synergistically to allow liquid to be rapidly transferred from top to bottom and evenly distributed within the diffusion layer 200 before being further introduced into the absorbent core 300 for absorption and storage. Through the selection of materials and the design of parameter ranges described above, this embodiment can effectively improve overall absorption efficiency and reduce the risk of localized leakage while ensuring rapid liquid introduction and uniform distribution, and simultaneously improve dryness and comfort during use.

[0065] The following are several embodiments that illustrate in detail the absorbent articles provided by the embodiments of the present invention.

[0066] Example 1

[0067] This embodiment provides an absorbent article comprising a skin-friendly layer 100, a diffusion layer 200, an absorbent core 300, and a leak-proof bottom layer 400 arranged sequentially along its height. The absorbent core 300 includes a central region and side regions located on both sides of the central region along its length. The side regions have more layers than the central region, thereby forming a physical liquid storage space 500 in the central region of the absorbent core 300. This structural design allows liquid to quickly converge in the central region of the absorbent core 300 after entering the diffusion layer 200 from the skin-friendly layer 100, forming a temporary storage area within the physical liquid storage space 500, and then gradually diffusing and absorbing into the interior of the absorbent core 300. Simultaneously, the increased number of layers in the side regions creates structural protrusions, which limit the lateral diffusion of the liquid, thereby improving overall absorption efficiency and reducing the risk of side leakage.

[0068] Example 2

[0069] In this embodiment, the structure of the absorbent core 300 in Embodiment 1 is refined. The absorbent core 300 includes a cover layer 310 and a main absorbent layer 320 located inside the cover layer 310. The main absorbent layer 320 is folded and fixed from both sides towards the center in its width direction, so that the folded side region forms a multi-layered structure, while the central region remains a single-layer or low-layer structure, thereby making the number of layers in the side region greater than that in the central region. The cover layer 310 is used to wrap and limit the folded main absorbent layer 320, and while stabilizing the structure, it forms a physical liquid storage space 500 above the central region, so that after the liquid enters the absorbent core 300, it can preferentially accumulate and penetrate and absorb in the central region, thereby improving the instantaneous absorption capacity and improving surface dryness.

[0070] Example 3

[0071] This embodiment further optimizes the structural morphology of the absorbent core 300 based on Embodiment 2. The main absorbent layer 320 is a non-woven fabric absorbent powder mixture layer, and the covering layer 310 includes an upper covering layer 330 and a lower covering layer 340. The lower covering layer 340 is used to wrap the folded non-woven fabric absorbent powder mixture layer and forms open areas at both ends in its width direction. The upper covering layer 330 is fixed and sealed to the open areas with hot melt adhesive, thereby forming a closed absorbent core 300 structure. In this structure, the non-woven fabric absorbent powder mixture layer forms a stable layer difference structure after folding, creating a physical liquid storage space 500 in the middle area. At the same time, the upper and lower covering layer structures constrain and stabilize the internal absorbent material, preventing displacement or collapse of the absorbent material during use, thereby further improving structural stability and leak-proof performance.

[0072] Example 4

[0073] In this embodiment, the structure of the absorbent core 300 in Embodiment 1 is refined. The absorbent core 300 is a prefabricated core structure, which is a single-layer structure integrally formed by wet molding, airflow mesh formation, or melt-blowing process, or a multi-layer structure formed by offline composite of multiple materials. This allows the prefabricated core to possess basic absorption performance and structural stability under different process conditions. When the prefabricated core is a multi-layer structure, it includes a first folded area 350 and a second folded area 360. The first folded area 350 is located below the second folded area 360 in the height direction of the absorbent core 300, and the width of the second folded area 360 does not exceed the width of the first folded area 350, thereby forming a stepped stacked structure in the height direction of the prefabricated core.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An absorbent article, characterized in that, include: A skin-friendly layer (100), a diffusion layer (200), an absorbent core (300), and a leak-proof bottom layer (400) are arranged sequentially along the height direction. The absorbent core (300) includes a central region and side regions located on both sides of the central region along its length direction. The side regions have more layers than the central region, so that a physical liquid storage space (500) is formed in the central region of the absorbent core (300).

2. The absorbent article according to claim 1, characterized in that, The absorbent core (300) includes a cover layer (310) and a main absorbent layer (320) located inside the cover layer (310). The two sides of the main absorbent layer (320) in the length direction are folded towards the middle and fixed so that the number of layers in the side region is greater than that in the middle region.

3. The absorbent article according to claim 2, characterized in that, The two sides of the main absorption layer (320) are double-layer or multi-layer structures, and the middle part of the main absorption layer (320) is a single-layer structure.

4. The absorbent article according to claim 2, characterized in that, The main absorbent layer (320) is a mixture of fluff pulp and absorbent powder. The cover layer (310) wraps the folded fluff pulp and absorbent powder mixture, and the two ends of the cover layer (310) in the width direction form an overlapping area, which is fixed by hot melt adhesive.

5. The absorbent article according to claim 4, characterized in that, The width of the fluff pulp and absorbent powder mixture layer is 60mm to 240mm, the basis weight is 80gsm to 400gsm, and the proportion of absorbent powder is 0% to 50%. And / or, the covering layer (310) is toilet paper, spunlace nonwoven fabric, spunbond nonwoven fabric, spunmelt nonwoven fabric, meltblown nonwoven fabric and / or hot air nonwoven fabric, the width of the covering layer (310) is 110mm to 300mm, and the basis weight of the covering layer (310) is 5gsm to 60gsm.

6. The absorbent article according to claim 2, characterized in that, The main absorbent layer (320) is a non-woven fabric water-absorbing powder mixture layer. The cover layer (310) includes an upper cover layer (330) and a lower cover layer (340). The lower cover layer (340) wraps the folded non-woven fabric water-absorbing powder mixture layer, and the two ends of the lower cover layer (340) in the width direction form open areas. The upper cover layer (330) is fixedly sealed to the open areas by hot melt adhesive.

7. The absorbent article according to claim 6, characterized in that, The width of the nonwoven fabric water-absorbing powder mixed layer is 60mm to 240mm, wherein the nonwoven fabric basis weight is 30gsm to 80gsm, and the water-absorbing powder basis weight is 30gsm to 200gsm. And / or, the upper cover layer (330) and the lower cover layer (340) are toilet paper, dust-free paper, spunlace nonwoven fabric, spunbond nonwoven fabric, spunmel and / or meltblown nonwoven fabric, the width of the upper cover layer (330) is 40mm to 130mm, the width of the lower cover layer (340) is 70mm to 260mm, and the basis weight of the upper cover layer (330) and the lower cover layer (340) is 5gsm to 70gsm.

8. The absorbent article according to claim 1, characterized in that, The absorbent core (300) is a prefabricated core, which is a single-layer structure integrally formed by wet process, airflow mesh formation or melt-blown process; or, the prefabricated core is a multi-layer structure made of multiple materials offline composite. And / or, the prefabricated core has a basis weight of 60 gsm to 300 gsm.

9. The absorbent article according to claim 8, characterized in that, The prefabricated core includes a first folded area (350), which is disposed in the side region of the absorbent core (300) so that the number of layers in the side region of the absorbent core (300) is greater than that in the middle region. Alternatively, the prefabricated core may include a first folded area (350) and a second folded area (360), wherein the first folded area (350) is located below the second folded area (360) in the height direction of the absorbent core (300), and the width of the second folded area (360) does not exceed the width of the first folded area (350).

10. The absorbent article according to claim 1, characterized in that, The skin-friendly layer (100) is a hot-air nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric and / or composite nonwoven fabric; the basis weight of the skin-friendly layer (100) is 15 gsm to 70 gsm. And / or, the diffusion layer (200) is a single-layer hot-air nonwoven fabric, a multi-layer hot-air nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, a cleanroom paper, a composite cleanroom paper, and / or a woven core material; the basis weight of the single-layer hot-air nonwoven fabric, the multi-layer hot-air nonwoven fabric, the spunbond nonwoven fabric, or the spunlace nonwoven fabric is 15 gsm to 60 gsm, the basis weight of the cleanroom paper or the composite cleanroom paper material is 30 gsm to 70 gsm, and the basis weight of the woven core material is 70 gsm to 200 gsm; And / or, the leak-proof bottom layer (400) is a PE film material and / or a PE composite nonwoven fabric material; the basis weight of the leak-proof bottom layer (400) is 10 gsm to 50 gsm.

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