An absorbent article having an embossing-free absorbent layer

Abstract

The application relates to a sanitary product with an embossing-free absorbent layer, which comprises a bottom layer, an absorbent layer and a surface layer; the absorbent layer comprises an absorbent core and a liquid-permeable layer, the absorbent core has an absorbent area and a plurality of flow guide areas, the plurality of flow guide areas are distributed at intervals in the absorbent area; the absorbent core is formed by fluff pulp adsorption, the absorbent area and the flow guide areas are integrally formed in the adsorption process, the absorbent core comprises a boundary area, the boundary area comprises the flow guide areas and a 1mm range where edges of the flow guide areas intersect with the absorbent area, and the fluff pulp density of the boundary area has no obvious difference with the fluff pulp density of the absorbent area. The application has the effect of avoiding the formation of high-density areas of the absorbent core.

Description

Technical Field

[0001] This application relates to the technical field of absorbent sanitary products, and in particular to a sanitary product having an absorbent layer that does not require embossing. Background Technology

[0002] In sanitary products such as sanitary napkins, diapers, and pads, the absorbent core is typically made from adsorbed fluff pulp, which is then coated with a liquid-permeable layer to form the absorbent layer. This absorbent layer is located between the surface and bottom layers. Depending on the process requirements, after the absorbent layer is manufactured, a secondary embossing process is required to guide liquid diffusion through the grooves created by the embossing. During embossing, the stamping tool compresses the fluff pulp at the embossing location to form grooves. This causes the fluff pulp at these locations to coalesce towards the edge of the groove or accumulate at the bottom, forming high-density lumps that hinder liquid absorption and impede rapid penetration and diffusion. Furthermore, uneven stress distribution during embossing can lead to localized accumulation of absorbent core material, resulting in excessively high local density. This further affects the uniformity of overall absorbency, making it easier for liquid to accumulate on the surface and reducing user comfort. Regarding the aforementioned technologies, the inventors believe that there are defects such as inconsistent localized density of the absorbent core material. Utility Model Content

[0003] In view of this, this application provides a sanitary product with an embossed absorbent layer to achieve liquid diversion while avoiding the formation of high-density areas in the absorbent core.

[0004] The sanitary product with an embossed absorbent layer provided in this application adopts the following technical solution: A sanitary product with an absorbent layer that does not require embossing includes a bottom layer, an absorbent layer, and a top layer, wherein the absorbent layer is located between the bottom layer and the top layer; the absorbent layer includes an absorbent core and a liquid-permeable layer, the liquid-permeable layer covering the absorbent core, the absorbent core having an absorbent area and multiple flow-guiding areas, the multiple flow-guiding areas being spaced apart between the absorbent areas; the absorbent core is formed by adsorption molding of fluff pulp, the absorbent area and the flow-guiding areas are integrally formed during the adsorption process, the absorbent core includes a boundary area, the boundary area including the flow-guiding areas and a 1mm range where the edge of the flow-guiding area intersects with the absorbent area, the fluff pulp density of the boundary area is not significantly different from the fluff pulp density of the absorbent area.

[0005] By adopting the above technical solution, an absorption zone and multiple flow guiding zones are set in the absorbent core, and these zones are formed together during the core forming stage. This eliminates the need for embossing to create flow guiding channels, avoiding subsequent embossing processes and preventing the formation of high-density areas in the absorbent core due to embossing, thus improving the smoothness of liquid absorption. Multiple flow guiding zones are spaced apart between the absorption zones, ensuring that the liquid is guided and diffused at different locations within the absorption zone, improving the uniformity of liquid absorption. A capillary gradient is formed between the flow guiding zones and the absorption zones, achieving both liquid guidance and diffusion. The flow guiding zones and absorption zones are integrally adsorbed, and the density of the fluff pulp at the interface is not significantly different from that in the absorption zone, resulting in a uniform fluff pulp density in the absorbent core and improving absorption efficiency.

[0006] Preferably, the fluff pulp density within 1 mm of the intersection of the guide zone edge and the absorption zone is the same as the average fluff pulp density of the absorption zone.

[0007] By adopting the above technical solution, the integrated adsorption of the absorption layer ensures that no high-density abrupt change region is formed at the edge of the flow guiding area, so as not to hinder the diffusion of the liquid.

[0008] Preferably, the absorption region includes a first surface near the surface layer and a second surface near the bottom layer, the flow guiding region extends through the first surface and the second surface, or the flow guiding region includes a third surface located between the first surface and the second surface; the flow guiding region includes at least one geometric hole, the geometric hole having a regular geometric shape or an irregular geometric shape.

[0009] By adopting the above technical solution, regular or irregular shaped geometric holes are used as flow guiding structures. The edges of the geometric holes are used to guide the flow of liquid, and the holes are used to diffuse the liquid, thereby accelerating the speed of liquid penetration and diffusion.

[0010] Preferably, the geometric hole extends through the thickness direction of the absorbent core, and the edges at both ends of the geometric hole intersect with the first surface and the second surface, respectively.

[0011] By adopting the above technical solution, the geometric holes that run through the product can reduce the weight of the entire absorbent core, making the sanitary products softer and more breathable, and saving materials and reducing costs.

[0012] Preferably, the geometric hole is recessed into the first surface, the bottom of the geometric hole is the third surface, and the top edge of the geometric hole intersects with the first surface.

[0013] By adopting the above technical solution, the recessed geometric holes can reduce the weight of the entire absorbent core, making the sanitary products softer and more breathable, saving materials and reducing costs, while maintaining the structural strength of the entire absorbent core.

[0014] Preferably, the absorption region includes a central convex portion and a fourth surface, wherein the first surface is located on the central convex portion and protrudes beyond the fourth surface, and the third surface and the fourth surface are located on the same plane.

[0015] By adopting the above technical solution, the central convex part serves as the main part for absorbing liquid, and the flow guiding area located in the central convex part can ensure the effect of flow guiding and diffusion.

[0016] Preferably, each of the flow guiding zones includes four geometric holes, including two first geometric holes located on the center line of the length of the absorber core, and two second geometric holes located on both sides of the center line of the length. The four geometric holes are regularly distributed in a cross shape, and the multiple flow guiding zones are spaced apart along the length direction of the absorber core.

[0017] By adopting the above technical solution, the absorbent core is provided with flow guiding structures in both the horizontal and vertical directions, forming a multi-directional flow guiding network, which makes the liquid flow and diffusion uniform and rapid.

[0018] Preferably, the spacing between the two first geometric holes and the spacing between the two second geometric holes is half the width of the absorber core, the spacing between two adjacent flow guiding areas is half the width of the absorber core, and the four geometric holes are circular blind holes.

[0019] By adopting the above technical solution, the spacing between geometric holes is set based on the width of the absorber core, avoiding a decrease in structural strength due to overly dense distribution of geometric holes, or a decrease in flow guiding effect due to insufficient distribution of geometric holes. The blind hole setting allows liquid to fall directly into the bottom of the circular blind hole and permeate, improving the utilization rate of the fluff pulp near the bottom layer and fully leveraging the absorption effect of the absorber core.

[0020] Preferably, each of the flow guiding zones includes multiple geometric holes arranged in two staggered rows and spaced apart along the width direction of the absorbent core. The spacing between two geometric holes at both ends of the width direction is 1 / 2 of the width dimension of the absorbent core. The multiple flow guiding zones are spaced apart along the length direction of the absorbent core. The spacing between two flow guiding zones at both ends of the length direction of the absorbent core is 2 / 3 of the length dimension of the absorbent core. The multiple geometric holes are circular through holes.

[0021] By adopting the above technical solution, the spacing between geometric holes is set based on the width dimension of the absorber core, and the spacing between the flow guiding areas is set based on the length dimension of the absorber core, so as to avoid the structural strength reduction due to excessively dense distribution of geometric holes, or the flow guiding effect reduction due to insufficient distribution of geometric holes.

[0022] Preferably, each flow guiding region has a geometric hole, which is a heart-shaped hole, and the multiple flow guiding regions are randomly distributed within the absorption region.

[0023] By adopting the above technical solution, the heart-shaped holes can increase the liquid contact area and improve the penetration and diffusion effect, while the irregular distribution can avoid stress concentration.

[0024] This application provides a sanitary product with an absorbent layer that does not require embossing. This eliminates the need for secondary embossing of the absorbent layer, reducing a process and improving production efficiency. The absorbent core integrally forms the absorption zone and the flow-guiding zone during the adsorption molding stage, avoiding the problem of high-density lumps of fluff pulp hindering liquid absorption caused by the embossing process, thus achieving smooth liquid absorption. Since the absorption zone and flow-guiding zone are formed through adsorption, the fluff pulp density at the interface between the flow-guiding zone and the absorption zone is consistent with the fluff pulp density at any location in the absorption zone. The liquid-permeable layer does not require embossing, avoiding the problem of polymer material damage and spillage caused by embossing tools. The use of a geometric pore flow-guiding structure increases the liquid contact area, improves the flow-guiding effect, and allows rapid diffusion into the internal fluff pulp, accelerating liquid penetration and diffusion. The sanitary product provided in this application has strong absorbency, is thin and soft, and has excellent breathability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the separate parts of a sanitary napkin provided in this embodiment.

[0026] Figure 2 This is a schematic diagram of the absorber core provided in the embodiments of this application.

[0027] Figure 3 This is a cross-sectional schematic diagram of a geometric hole provided in an embodiment of this application.

[0028] Figure 4 This is a cross-sectional schematic diagram of another geometric hole provided in an embodiment of this application.

[0029] Figure 5 This is a cross-sectional schematic diagram of the convex portion provided in an embodiment of this application.

[0030] Figure 6 This is a schematic diagram of the absorber core provided in some other embodiments of this application.

[0031] Figure 7 This is a schematic diagram of the absorber core provided in some other embodiments of this application.

[0032] Figure 8 This is a schematic diagram of the absorber core provided in some other embodiments of this application.

[0033] Figure 9 This is a schematic diagram of the mold wheel provided in the embodiments of this application.

[0034] Figure 10 This is a cross-sectional schematic diagram of the mold wheel provided in the embodiment of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Bottom layer; 2. Absorbent layer; 21. Absorbent core; 211. Absorbent area; 212. Guided area; 213. Through hole; 214. Recessed groove; 215. First surface; 216. Second surface; 217. Third surface; 218. Fourth surface; 231. Circular blind hole; 241. Circular through hole; 251. Heart-shaped hole; 22. Liquid permeable layer; 3. Surface layer; 41. Mold wheel; 411. Adsorption hole; 412. Adsorption channel; 42. Core mold; 421. Template; 422. Cavity; 423. Forming mesh; 424. Geometric protrusion. Detailed Implementation

[0036] To better understand the purpose, technical solutions, and advantages of this application, it has been described and illustrated below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that this application can be implemented without these details. In some cases, to avoid obscuring various aspects of this application due to unnecessary description, well-known methods, processes, systems, components, and / or circuits already described at a higher level will not be elaborated upon. It will be apparent to those skilled in the art that various modifications can be made to the embodiments disclosed in this application, and the general principles defined in this application can be applied to other embodiments and application scenarios without departing from the principles and scope of this application. Therefore, this application is not limited to the illustrated embodiments, but conforms to the broadest scope consistent with the scope of protection claimed in this application.

[0037] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding of the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples.

[0040] This application discloses a sanitary product with an embossed absorbent layer. The sanitary product includes, but is not limited to, sanitary napkins, diapers, nursing pads, and other human daily necessities. For ease of description, this application uses sanitary napkins as an example.

[0041] Please refer to Figure 1 This is a schematic diagram of the components of a sanitary napkin provided in an embodiment of this application. The sanitary napkin includes a liquid-impermeable bottom layer 1, a liquid-absorbent layer 2, and a liquid-permeable top layer 3. The absorbent layer 2 is located between the bottom layer 1 and the top layer 3. The top layer 3 is used for contact with the human body and can be made of non-woven fabric. The bottom layer 1 generally has an adhesive part to fix the position of the sanitary product to clothing, and it can be made of PE film. The bottom layer 1 and the top layer 3 are sealed by heat pressing to cover the absorbent layer 2.

[0042] like Figure 1 As shown, the absorbent layer 2 includes an absorbent core 21 and a liquid-permeable layer 22, wherein the liquid-permeable layer 22 covers the absorbent core 21. The liquid-permeable layer can be made of one of the following liquid-permeable materials: absorbent backing paper, hot-air nonwoven fabric, viscose woven cleanroom cloth, or cleanroom paper. The absorbent core 21 is formed by adsorbing fluff pulp under negative pressure. Figure 2 As shown, the absorbent core 21 includes an absorption region 211 and multiple flow guiding regions 212. The absorption region 211 is the main liquid absorption area, and the flow guiding regions 212 are areas that can promote liquid flow and diffusion. Multiple flow guiding regions 212 can be distributed at different positions in the absorption region 211, so that when the liquid flows through different positions in the absorption region 211, it is guided and diffused by the flow guiding regions 212, resulting in strong absorption.

[0043] Figure 2Three flow guiding regions 212 are shown, wherein the cross-sectional area is the absorption region 211, and the circular regions discretely distributed in annular shape are the flow guiding regions 212. The three flow guiding regions 212 are distributed at different positions along the length of the absorption region 211. In this embodiment, the length and width of the absorption region 211 are the same as the length and width of the entire absorption core 21, and the thickness of the absorption region 211 is the same as the overall thickness of the absorption core 21. The flow guiding region 211 penetrates the first surface 215 and the second surface 216 of the absorption region 211, or the flow guiding region 211 includes a third surface 217, which is located between the first surface 215 and the second surface 216.

[0044] like Figure 3 As shown, the flow guiding region 212 can penetrate the entire thickness of the absorption core 21, forming a through hole 213, or as... Figure 4 As shown, the flow guiding region 212 can pass through only part of the thickness of the absorber core 21 to form a recessed groove 214. The bottom of the recessed groove 214 is the third surface 217 of the flow guiding region 211. A capillary gradient can be formed between the first surface 215 and the third surface 216 to guide the liquid diffusion. The guide zone 212 extends from the first surface 215 of the absorption zone 211 towards the second surface 216. The first surface 215 is the side closest to the surface layer 3, i.e., the top surface of the absorption zone 211. The second surface 216 is the side closest to the bottom layer 1, i.e., the bottom surface of the absorption zone 211. The first surface 215 and the second surface 216 are opposite each other, and the second surface 216 and the bottom surface of the guide zone 212 are on the same plane. The bottom surfaces of both the absorption zone 211 and the guide zone 212 are in contact with the liquid permeable layer 22. The top surface of the absorption zone 211 is in contact with the liquid permeable layer 22, while the top surface of the guide zone 212 is open and does not contact the liquid permeable layer 22. In this embodiment, the absorption core 21 is formed by negative pressure adsorption using fluff pulp. Zone 211 and the flow guiding zone 212 are integrally formed during adsorption molding, achieving the flow guiding function without subsequent embossing. The absorbent core 21 also includes a boundary zone, which includes the flow guiding zone 212 and a 1mm area where the edge of the flow guiding zone 212 intersects with the absorbent zone 211. The fluff pulp density in the boundary zone is not significantly different from that in the absorbent zone 211. "Not significantly different" means that the fluff pulp density in the absorbent zone 211 and the boundary zone are visually indistinguishable, and the ratio between them can range from 80% to 100%. Furthermore, the fluff pulp density within the 1mm area where the edge of the flow guiding zone 212 intersects with the absorbent zone 211 can also be the same as the average fluff pulp density of the absorbent zone 211. Table 1 shows the differences in visual and tactile sensation under different density ratios.

[0045] Table 1:

[0046] This application sets the absorbent core 21 as an absorption area 211 and multiple flow guiding areas 212. When liquid seeps into the absorbent layer 2, the flow guiding areas 212 guide the liquid to diffuse into the interior of the absorbent core 21, preventing liquid from accumulating on the first surface 215 of the absorbent core 21 and forming a blockage. Thus, the absorbent layer 2 can achieve the function of guiding liquid diffusion without embossing. The absorption area 211 and the flow guiding areas 212 are formed simultaneously by adsorbing the fluff pulp in one step, without the need for secondary processing. This improves production efficiency and avoids local accumulation caused by uneven stress distribution. Since no subsequent embossing process is performed, the fluff pulp maintains a natural forming state during coagulation. The density of the fluff pulp at the junction of the flow guiding area 212 and the absorption area 211 is the same as the average fluff pulp density of the absorption area 211. The fluff pulp is not compressed and will not form a high-density area, avoiding the density change caused by the original embossing process, which would hinder the seepage of the liquid. This improves the uniformity of liquid absorption and the comfort of use.

[0047] Furthermore, existing absorbent layers may be embossed separately (after the absorbent core is coated with the liquid-permeable layer) or in combination with the surface layer. Separate embossing can cause the polymer material of the liquid-permeable layer to spill out, while combined embossing can easily cause wear on the embossing tools. In contrast, the absorbent layer 2 of this application eliminates the need for an embossing process after the absorbent core 21 is adsorbed and formed in one step, thus avoiding damage to the polymer material structure of the liquid-permeable layer 22 and wear on the tools.

[0048] like Figure 2 As shown, multiple flow-guiding zones 212 are spaced apart within the absorption zone 211. Each flow-guiding zone 212 includes at least one geometric hole. A geometric hole refers to a recessed groove or through-hole with a specific contour. Its shape includes, but is not limited to, regular shapes such as circles, ellipses, rectangles, and polygons, as well as irregular shapes such as hearts, clouds, and leaves. The edges of the geometric holes form liquid diffusion paths, achieving a flow-guiding effect. Regular geometric holes form smooth transition edges, facilitating flow guidance, while the pore walls of irregular geometric holes increase the liquid contact area, both enhancing the liquid diffusion effect. Existing sanitary napkins generally have continuous embossed grooves, which can easily form continuous high-density areas that hinder liquid absorption, causing liquid retention and accumulation. Figure 2 As shown, taking three flow guiding zones 212, each of which includes six circular geometric holes, as an example, the six geometric holes are arranged in a ring array. The three flow guiding zones 212 are arranged at intervals along the length of the absorber core 21. By interspersing multiple flow guiding zones 212 in the absorber zone 211, and combining the discrete distribution of geometric holes to replace the existing continuous embossing area, even if there are local high-density areas, the liquid can penetrate from the spacing of each geometric hole or other paths to form multiple flow guiding paths, thus avoiding the liquid retention problem caused by continuous high-density areas in the existing embossing process.

[0049] In existing sanitary napkins, liquid gradually seeps into the absorbent core from the surface, easily accumulating and clogging the first surface of the absorbent core. Generally, the fluff pulp near the first surface absorbs the liquid first and then slowly diffuses and permeates downwards, resulting in slow liquid diffusion. Since sanitary napkins need to be changed at intervals, the fluff pulp near the second surface may not have absorbed the liquid by the time of replacement, thus failing to perform its absorption function.

[0050] In some embodiments, such as Figure 3 As shown, the geometric hole is a through-hole 213 that penetrates the entire thickness of the absorbent core 21. The edge of the geometric hole intersects with the absorbent area 211. The fluff pulp density within a 1mm range of this edge and absorbent area is the same as the average fluff pulp density within the absorbent area 211. When liquid is absorbed by the first surface 215, it can be guided through the edge of the through-hole 213 and penetrate downwards through the hole wall to the second surface 216. During the process of permeating and guiding to the second surface 216, it permeates and diffuses towards the circumferential side of the through-hole 213, preventing liquid from accumulating on the surface and improving the liquid absorption effect. The through-hole 213 design can improve the absorption effect while reducing the weight of the fluff pulp, saving materials and making the sanitary products thin, light, and highly breathable.

[0051] In other embodiments, such as Figure 4 As shown, the geometric hole is a recessed groove 214, which does not penetrate the entire thickness direction of the absorbent core 21, but forms a recess. The bottom of the recessed groove 214 is also filled with fluff pulp. The thickness of the fluff pulp between the bottom of the geometric hole and the second surface 216 is the second thickness H2, and the thickness of the fluff pulp between the first surface 215 and the second surface 216 of the absorbent core 21 is the first thickness H1. During liquid absorption, the liquid can be guided through the edge of the recessed groove 214 and penetrate downward through the hole wall. If the liquid directly enters the bottom of the recessed groove 214, it can also directly penetrate into the fluff pulp near the bottom layer 1 and diffuse laterally, improving the utilization rate of the fluff pulp, enhancing the liquid diffusion and absorption effect, and improving the user's refreshing comfort. By setting the geometric hole as a recessed groove 214, the absorption effect can be improved while ensuring the structural strength of the absorbent core 21, reducing the weight of the fluff pulp, saving materials, and making the sanitary products thin and highly breathable.

[0052] Please refer to Figure 5The absorbent area 211 also includes a central convex portion and a fourth surface 218. The first surface 215 is located in the central convex portion and protrudes beyond the fourth surface 218. The central convex portion is located in the middle region of the absorbent core 21. When using a sanitary napkin, liquid generally concentrates in the middle region. Therefore, a central convex portion is provided in the middle region of the absorbent core 21. The central convex portion has a higher content of fluff pulp to serve as the main absorption area. The central convex portion protrudes towards the surface layer 3. The first surface 215 of the absorbent area 211 is the top surface of the central convex portion, and the fourth surface 218 is the bottom surface of the central convex portion. A recessed groove 214 is provided in the central convex portion, and its third surface 217 and fourth surface 218 are located on the same plane. By setting a central convex portion at the liquid concentration discharge position to directly absorb liquid, and setting a guide area 212 on the central convex portion to guide the liquid to quickly diffuse and penetrate, the absorption effect is improved. The fact that the third surface 217 and fourth surface 218 are on the same plane can maintain the strength of the absorbent core.

[0053] In other embodiments, such as Figure 6 As shown, there are three flow guiding zones 212, each including four geometric holes. These four geometric holes include two first geometric holes located along the length centerline of the absorber core 21, and two second geometric holes located on either side of the length centerline. The length centerline refers to a symmetrical line extending along the length of the absorber core 21 and located at the center of its width. The four geometric holes are regularly distributed in a cross shape and are symmetrically arranged in pairs, ensuring that the absorber core 21 has geometric holes as flow guiding structures in both its transverse and longitudinal directions. These four geometric holes form a crisscrossing permeation network inside the absorber core 21. Multiple flow guiding zones 212 extend along the absorber core 21... The length-direction spacing of the 1 ensures that the absorbent core 21 has geometric holes as flow guiding structures along its length. The distance between two first geometric holes is equal to the distance between two second geometric holes, both being half the minimum width of the absorbent core 21. The spacing of the geometric holes is determined based on the proportional relationship of the width of the absorbent core 21, ensuring that the flow guiding structure of the entire absorbent core 21 is equidistant in both the transverse and longitudinal directions. This avoids insufficient overall structural strength of the absorbent core 21 due to excessive distribution of geometric holes in certain areas. During liquid diffusion, the symmetrically distributed geometric holes also form a uniform permeation path. In this embodiment, the four geometric holes can be circular blind holes 231 with a diameter greater than or equal to 6 mm. When liquid seeps from the permeable layer 22 into the surface of the absorbent core 21, if it corresponds exactly to the center position of the circular blind hole 231, due to its large diameter, the liquid may drip directly from the permeable layer 22 to the bottom of the blind hole, and then diffuse through the fluff pulp between the bottom of the blind hole and the second surface 216 of the absorbent core 21, fully utilizing the absorption function of the absorbent core. In actual use, liquid usually seeps into the center of the sanitary napkin, towards the front. Figure 5 As shown, the distribution of geometric holes is also biased towards the front side of the absorption core 21, which is more in line with actual usage.

[0054] In other embodiments, such as Figure 7 As shown, there are 5 flow guiding zones 212, each of which includes 5 geometric holes. The 5 geometric holes are arranged in two alternating rows, and are spaced apart along the width direction of the absorption core 21. The distance between the two geometric holes at both ends of the width direction is 1 / 2 of the minimum width dimension of the absorption core 21. The 5 flow guiding zones 212 are spaced apart along the length direction of the absorption core 21. The distance between the two flow guiding zones 212 at both ends of the length direction of the absorption core 21 is 2 / 3 of the length dimension of the absorption core 21. Thus, the flow guiding structure is distributed in all positions where the absorption core 21 mainly absorbs liquid, improving the uniformity of liquid absorption. In this embodiment, the geometric holes are circular through holes 241 with a diameter of 3 mm or less. The smaller diameter allows for a greater distribution of geometric holes in both the width and length directions, increasing the density of the flow-guiding structure, accelerating liquid diffusion, and improving flow uniformity. The staggered distribution of the two rows of geometric holes does not compromise the structural strength of the absorber core 21. When liquid seeps from the permeable layer 22 into the first surface 215 of the absorber core 21, if it corresponds precisely to the position of the circular through hole 241, the liquid can directly contact the edge of the circular through hole 241 due to its smaller diameter and then be guided through its hole wall. In this embodiment, the distribution of the geometric holes is also biased towards the front side of the absorber core 21, which is more in line with actual usage.

[0055] In other embodiments, such as Figure 8 As shown, there are nine flow guiding zones 212, each including a heart-shaped hole 251. Each heart-shaped hole 251 is randomly distributed in the absorption zone 211. The edges and walls of the heart-shaped holes 251 can increase the liquid contact area, enabling faster flow and diffusion of the liquid and improving the liquid absorption effect. The random distribution can avoid stress concentration and prevent the formation of high-density areas.

[0056] Please refer to Figure 9 and Figure 10This is a production equipment for producing the sanitary products described in any of the above embodiments. The production equipment includes a feeding device (not shown in the figure), an adsorption device (not shown in the figure), a circular mold wheel 41, and multiple core molds 42. The mold wheel 41 and the multiple core molds 42 are used to produce the absorbent core 21. The multiple core molds 42 are connected to the mold wheel 41 and are evenly distributed circumferentially and located on the circumferential surface of the mold wheel 41. Each core mold 42 includes a template 421 and a forming mesh 423. The template 421 is connected to the mold wheel 41 and includes a cavity 422 for filling fluff pulp and defining the contour of the absorbent core 21. The forming mesh 423 is located at the bottom of the cavity 422 and connected to the inner side of the template 421. The inner side of template 421 faces the axis of mold wheel 41, and the outer side of template 421 is the same as the circumferential side of mold wheel 41. The forming mesh 423 has mesh holes, and the cavity 422 is connected to the adsorption channel 412 inside mold wheel 41 through the mesh holes. The adsorption channel 412 is connected to the adsorption device through adsorption holes 411. Multiple protrusions are connected to the forming mesh 423 and protrude towards the top of cavity 422. The multiple protrusions are located inside cavity 422 and can be connected to the forming mesh 423 by pasting or welding. The multiple protrusions are used to block fluff pulp during adsorption, so that the absorbent core 21 forms a partitioned structure. The adsorption device fixes the fluff pulp in cavity 422 by negative pressure. The feeding device can quantitatively deliver fluff pulp to cavity 422. The feeding device is sealed to the inlet of cavity 422 to prevent fluff pulp leakage. The adsorption device and the feeding device can use existing equipment, which will not be described here.

[0057] When making the absorbent core 21, the mold wheel 41 drives multiple core molds 42 to pass through the feeding station and the adsorption station in sequence during the rotation process. The feeding device quantitatively delivers loose fluff pulp to the cavity 422. The adsorption device generates negative pressure through the adsorption channel 412 inside the mold wheel 41 and the mesh of the forming net 423 to adsorb the loose fluff pulp into the cavity 422 and coagulate it into a ball. The position of the protrusion blocks the connection between the cavity 422 and the adsorption channel 412, so that the thickness of the fluff pulp at the corresponding position is reduced or completely absent, forming the guide area 212 of the absorbent core 21. Other positions in the cavity 422 can be filled with fluff pulp of the same thickness to form the absorption area 211 of the absorbent core 21.

[0058] Since the protrusions are directly set in the forming mesh 423, the absorption core 21 completes the forming of the absorption area 211 and the flow guiding area 212 during the adsorption process, without the need for subsequent secondary embossing. This avoids the impact of the embossing tool causing the fluff pulp to be squeezed and accumulated to form a high-density area, and also avoids the stress concentration problem caused by secondary processing. Since the embossing process is eliminated, the material of the liquid permeable layer 22 will not be damaged, and there will be no problem of tool wear.

[0059] like Figure 9As shown, the protrusion includes at least one geometric protrusion 424, which protrudes towards the opening of the cavity 422. The height of the geometric protrusion 424 is equal to or less than the depth of the cavity 422. The geometry of the geometric protrusion 424 is determined according to product requirements. When its height is equal to the depth of the cavity 422, it forms a through hole that penetrates the entire thickness of the absorbent core 21. When its height is less than the depth of the cavity 422, it forms a blind hole that only penetrates a portion of the thickness of the absorbent core 21. The molding mesh 423 is detachably connected to the template 421, and the molding mesh 423 with protrusions of different geometric shapes can be adapted to the pattern requirements of different absorbent cores 21.

[0060] In some embodiments, the geometric bumps 424 can be configured as four circular bumps arranged in a cross shape, with a height of two-thirds of the depth of the cavity 422, so that the formed absorbent core 21 forms a cross-shaped blind hole structure in the corresponding area.

[0061] Through the above technical solutions, this application solves the problems of uneven distribution of fluff pulp density, damage to the liquid permeable layer 22 material, and wear of embossing tools caused by stamping in the existing process. The protrusion structure of the forming mesh 423 enables the absorbent core 21 to have a preset guiding area 212 in the initial forming stage, eliminating the need for subsequent secondary embossing processing. The optimization of the mold structure realizes the one-time adsorption forming of the absorbent core 21, improving the production efficiency and structural consistency of the absorbent core 21.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sanitary product with an embossed absorbent layer, characterized in that, include: Bottom layer (1), absorption layer (2) and surface layer (3); The absorption layer (2) is located between the bottom layer (1) and the top layer (3); the absorption layer (2) includes an absorption core (21) and a liquid permeable layer (22), the liquid permeable layer (22) covers the absorption core (21), the absorption core (21) has an absorption area (211) and a plurality of flow guiding areas (212), the plurality of flow guiding areas (212) are spaced apart between the absorption areas (211); The absorbent core (21) is formed by adsorption of fluff pulp. The absorbent area (211) and the guide area (212) are formed integrally during the adsorption process. The absorbent core (21) includes a boundary area, which includes the guide area (212) and the 1 mm range where the edge of the guide area (212) intersects with the absorbent area (211). The fluff pulp density of the boundary area is not significantly different from that of the absorbent area.

2. The sanitary product with an embossed absorbent layer according to claim 1, characterized in that, The fluff pulp density within 1 mm of the intersection of the edge of the guide zone (212) and the absorption zone (211) is the same as the average fluff pulp density of the absorption zone (211).

3. The sanitary product with an embossed absorbent layer according to claim 1, characterized in that, The absorption region (211) includes a first surface (215) near the surface layer (3) and a second surface (216) near the bottom layer (1), and the flow guiding region (212) extends through the first surface (215) and the second surface (216), or The flow guiding area (212) includes a third surface (217) located between the first surface (215) and the second surface (216); The flow guiding area (212) includes at least one geometric hole, which may have a regular or irregular geometric shape.

4. The sanitary product with an embossed absorbent layer according to claim 3, characterized in that, The geometric hole extends through the thickness direction of the absorber core (21), and the edges at both ends of the geometric hole intersect with the first surface (215) and the second surface (216), respectively.

5. The sanitary product with an embossed absorbent layer according to claim 3, characterized in that, The geometric hole is recessed in the first surface (215), the bottom of the geometric hole is the third surface (217), and the top edge of the geometric hole intersects with the first surface (215).

6. The sanitary product with an embossed absorbent layer according to claim 3, characterized in that, The absorption region (211) includes a central convex portion and a fourth surface (218), the first surface (215) is located in the central convex portion and protrudes from the fourth surface (218), and the third surface (217) and the fourth surface (218) are located in the same plane.

7. The sanitary product with an embossed absorbent layer according to claim 5 or 6, characterized in that, Each of the flow guiding zones (212) includes four geometric holes, including two first geometric holes located on the length center line of the absorber core (21) and two second geometric holes located on both sides of the length center line. The four geometric holes are regularly distributed in a cross shape, and multiple flow guiding zones (212) are spaced apart along the length direction of the absorber core (21).

8. The sanitary product with an embossed absorbent layer according to claim 7, characterized in that, The distance between the two first geometric holes and the distance between the two second geometric holes are 1 / 2 of the width of the absorber core (21), the distance between two adjacent flow guiding areas (212) is 1 / 2 of the width of the absorber core (21), and the four geometric holes are circular blind holes.

9. The sanitary product with an embossed absorbent layer according to claim 4 or 6, characterized in that, Each of the flow guiding areas (212) includes a plurality of geometric holes arranged in two staggered rows and spaced apart along the width direction of the absorber core (21), wherein the spacing between two geometric holes at both ends of the width direction is 1 / 2 of the width dimension of the absorber core (21), and the plurality of flow guiding areas (212) are spaced apart along the length direction of the absorber core (21), wherein the spacing between two flow guiding areas (212) at both ends of the length direction of the absorber core (21) is 2 / 3 of the length dimension of the absorber core (21); The plurality of geometric holes are circular through holes.

10. The sanitary product with an embossed absorbent layer according to any one of claims 4-6, characterized in that, Each flow guide region (212) has a geometric hole, which is a heart-shaped hole, and the multiple flow guide regions (212) are randomly distributed in the absorption region (211).

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