A sponge-like composite absorbent core

Abstract

The utility model belongs to the component accessory of absorbent article, disclose a kind of compound absorbent core of sponge-like. Including by sponge-like absorbent layer composition outer absorption part and inner reinforcing absorption part, outer absorption part is formed after the inward folding of two side edges of rectangular, square, similar rectangular, similar square sponge-like absorbent layer, forms a fold in the central and adjacent area;Inner reinforcing absorption part is overall rectangular or similar rectangular of 3~5cm wide, 6~15cm long, by including sponge-like absorbent layer and the water-absorbing cover layer being set in sponge-like absorbent layer opposite two sides composition, be wrapped in the interlayer formed after outer absorption part folding. The utility model fully combines own structural features, improve the percolation and diffusion efficiency of menstrual blood by the loose structure of sponge-like, reduce the moisture degree of core surface, and improve the core absorption rate.

Description

Technical Field

[0001] This utility model pertains to components of absorbent products and discloses a sponge-like composite absorbent core that can be applied to feminine sanitary napkin products. Background Technology

[0002] The prior patent application No. 202211151400.3 discloses a manufacturing process for an absorbent body for absorbent products. The upper and lower layers of the absorbent body are interwoven wood pulp fiber layers, and the middle layer is a meltblown fiber layer mixed with superabsorbent polymer particles. Its structural feature is that the elastic meltblown fibers are dispersed in the overall structure of the absorbent body, forming a dense mesh or sponge-like structure with the wood pulp fibers, which encapsulates the superabsorbent polymer particles, forming a composite foam-like material containing superabsorbent polymer particles.

[0003] The aforementioned existing technology, as a single-layer absorbent, is sufficient for application in conventional sanitary napkin materials. However, regarding the structure of this absorbent product, its physical properties and positive impact on enhancing absorption and maintaining surface dryness and other comfort properties still have room for further optimization in application. Utility Model Content

[0004] This utility model has conducted an in-depth exploration of the viewpoints mentioned in the background section and has achieved the desired technical effects by combining the following technical solutions, specifically through the following technical content: A sponge-like composite absorbent core includes an outer absorbent part and an inner reinforcing absorbent part composed of a sponge-like absorbent layer. The sponge-like absorbent layer is a porous layered material with an indefinite length and width boundary and a cross-section with three layers: upper, middle and lower. The upper and lower layers are wood pulp fiber layers, and the middle layer is a meltblown fiber layer mixed with superabsorbent polymer particles. The wood pulp fiber layer and the meltblown fiber layer are interlaced at adjacent boundaries. The outer absorbent part is formed by folding the two sides of the rectangular, square, rectangular or square sponge-like absorbent layer inward, forming a fold in the center and adjacent area, with the side where the fold exists as the bottom surface of the outer absorbent part and the reverse side as the top surface of the outer absorbent part. The inner reinforcing absorbent part is rectangular or rectangular in shape with a width of 3-5cm and a length of 6-15cm. It consists of a sponge-like absorbent layer and a water-absorbing covering layer disposed on the opposite sides of the sponge-like absorbent layer, and is wrapped in a sandwich formed after the outer absorbent part is folded.

[0005] As a further technical solution of this utility model, the weight per square meter of the inner reinforcing absorption part is greater than or equal to the weight per square meter of the outer absorption part.

[0006] As a further optimization of the above technical solution, the basis weight of the inner strengthening absorption part is 100~300 gsm, and the basis weight of the outer absorption part is 50~150 gsm.

[0007] As a further technical solution of this utility model, the outer absorption part is a rectangle or a rectangular or rectangular shape with a width of 6-10cm and a length of 12-15cm.

[0008] As a further technical solution of this utility model, the water-absorbing covering layer is one or two of the following: a paper sheet, a hydrophilic woven sheet, or a hydrophilic nonwoven sheet.

[0009] As a further technical solution of this utility model, the center of the inner reinforcing absorption part in the length direction is located in the region between 1 / 5 node and 1 / 2 node in the length direction of the outer absorption part, and includes the positions of the two endpoints of 1 / 5 node and 1 / 2 node.

[0010] As a further technical solution of this utility model, after the two sides of the outer absorption part are folded inward, at least a portion of them overlap each other, and the overlapping portion also overlaps with the normal projection of the inner reinforcing absorption part on the top surface of the outer absorption part.

[0011] As a further technical solution of this utility model, the inner reinforcing absorption part, which is wrapped in the interlayer formed after the outer absorption part is folded, pushes a part of the outer absorption part toward the top surface of the outer absorption part, forming at least one protruding guide part on the top surface of the outer absorption part.

[0012] The beneficial effects of this utility model are as follows: This product fully utilizes the structural characteristics of the absorbent material. Targeting the features of the human body, its sponge-like porous and loose spatial configuration allows menstrual blood to seep and diffuse locally into the core through the compression of the product during human activity. This reduces the amount of menstrual blood remaining on the surface of the absorbent core. The passive flow of menstrual blood is similar to the squeezing and pumping of liquid, guiding the blood to other unabsorbed parts of the absorbent core. This results in a soft and lightweight absorbent core product with good absorption and surface dryness properties, improving the utilization rate of the material itself. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the cross-sectional structure of the sponge-like composite absorbent core described in this utility model.

[0014] Figure 2 This is a cross-sectional structural diagram of the sponge-like composite absorbent core described in this utility model applied to sanitary napkin products.

[0015] Figure 3 This is a top view schematic diagram showing the selectable position range of the outer absorption part within the inner reinforcing absorption part of the present invention.

[0016] Figure 4 This is a cross-sectional schematic diagram showing the overlapping effect of the two sides of the outer absorption part of this utility model.

[0017] Figure 5 This is a cross-sectional schematic diagram of a preferred embodiment of the sponge-like composite absorbent core described in this utility model.

[0018] Wherein: 1-Outer absorbent part; 10-Folded opening; 11-Raised guide part; 2-Inner reinforced absorbent part; 20-Water-absorbing cover layer; 3-Wood pulp fiber layer; 4-High molecular weight absorbent particles; 5-Meltblown fiber layer; 6-Sanitary napkin surface layer; 7-Sanitary napkin bottom layer; 8-Sanitary napkin wings; A-Top surface of outer absorbent part; B-Bottom surface of outer absorbent part. Detailed Implementation

[0019] The embodiments of this utility model will be described below with reference to relevant examples and accompanying drawings: Combination Figures 1 to 5 As shown, a sponge-like composite absorbent core includes an outer absorbent part 1 and an inner reinforcing absorbent part 2 composed of a sponge-like absorbent layer. The sponge-like absorbent layer is a porous layered material with an indefinite length and width boundary in cross-section having three layers: upper, middle and lower. The upper and lower layers are wood pulp fiber layers 3, and the middle layer is a meltblown fiber layer 5 mixed with superabsorbent polymer particles 4. The wood pulp fiber layer 3 and the meltblown fiber layer 5 are interlaced at adjacent boundaries. The outer absorbent part 1 is formed by folding the two sides of the rectangular, square, rectangular or square sponge-like absorbent layer inward, and forming a fold 10 in the center and adjacent area. The side with the fold 10 is the bottom surface B of the outer absorbent part, and the opposite side is the top surface A of the outer absorbent part. The inner reinforcing absorbent part 2 is a rectangle or near-rectangular shape with a width of 3-5cm and a length of 6-15cm. It consists of a sponge-like absorbent layer and a water-absorbing covering layer 20 disposed on the opposite sides of the sponge-like absorbent layer, and is wrapped in the interlayer formed after the outer absorbent part 1 is folded.

[0020] The sponge-like composite absorbent core of this invention refers to the spatial characteristics of the physical structure and the direct technical effects of the material itself, resulting from the sponge-like absorbent layer applied to the outer absorbent part 1 and the inner reinforcing absorbent part 2. Generally speaking, the sponge-like absorbent layer is a fluffy, porous, elastic, and moisture-retaining polymer composite fabric formed by laying non-sponge meltblown fibers and wood pulp fibers on the surface of a mesh belt using a high-speed, interlaced spinning process. "Composite" refers to the fact that, viewed in cross-section, the sponge-like composite absorbent core is not a single-layer structure, but rather a composite structure with at least two types of "inner-outer" wrapping, as viewed from a macroscopic perspective. From a microscopic perspective, a single sponge-like absorbent layer has a three-layer structure consisting of upper, middle, and lower layers. The upper and lower layers are wood pulp fiber layers 3, and the middle layer is a meltblown fiber layer 5 mixed with superabsorbent polymer particles 4. The "absorbent core" is because even without the superabsorbent polymer particles 4, the massive gaps between the fibers of the sponge-like absorbent layer are sufficient to adsorb water molecules into the gaps through intermolecular forces, similar to the effect of sponge products. It can achieve the basic functions of conventional absorbent materials. On this basis, the superabsorbent polymer particles 4 mixed in, either free or molten and fixed on the fibers of the meltblown fiber layer 5, can also adsorb liquids themselves, thus meeting the relevant product definition requirements for an absorbent core.

[0021] The presence of the fold 10 allows enterprises to control production tolerances and reduce the consumption of raw materials during production. Under normal circumstances, the fold 10 should not be too wide and can be completely closed. The presence of a certain degree of fold 10 allows fluids such as menstrual blood to pass through the absorbent covering layer 20 below the inner reinforced absorbent part 2 and flow rapidly away from the human skin, and be absorbed by the nearest unsaturated sponge-like absorbent layer, forming a structure similar to a flow channel.

[0022] During use, menstrual blood permeates from the top surface A of the outer absorbent part towards the bottom surface B of the outer absorbent part. It first comes into contact with the outer absorbent part 1. Due to the capillary force of the sponge-like porous structure of the outer absorbent part 1, the menstrual blood quickly seeps down and diffuses within it to a certain extent. Subsequently, it is absorbed by the superabsorbent polymer particles 4 inside the outer absorbent part 1. The completely sealed fold 10 controls the flow of liquid within the gaps inside the sponge-like absorbent layer structure. This method, through capillary effect, can achieve faster conduction and effectively improve the liquid adsorption rate of the absorbent structure.

[0023] However, when using sanitary napkins, the body is usually in motion. Even when sitting, posture is often adjusted by changing leg positions, and women generally do not remain still during menstruation. Under these circumstances, intermittent compression occurs between the body and clothing, causing deformation of the material of the outer absorbent part 1. This allows menstrual blood and other fluids to move closer to the inner reinforced absorbent part 2. Before the menstrual blood is completely absorbed by the outer absorbent part 1, a "pumping" effect is created, squeezing it to the surface of the inner reinforced absorbent part 2. The surface of the inner reinforced absorbent part 2 has a water-absorbing covering layer 20. This covering layer is hydrophilic and can guide the menstrual blood and other fluids to continue to seep down into the wood pulp fiber layer 3 within the inner reinforced absorbent part 2, and then to the innermost meltblown fiber layer 5. Finally, the menstrual blood diffuses in all directions along with the porous structure of the meltblown fiber layer 5 and is absorbed by the superabsorbent polymer particles 4.

[0024] In simple terms, if there is only one sponge-like absorbent layer as the absorbent core, the core structure of the sponge-like absorbent layer may cause a certain degree of liquid leakage when squeezed because the menstrual blood cannot be completely absorbed in time. This is a natural physical structural characteristic of sponge products. However, the structural change in this application reasonably improves the above process. The menstrual blood is squeezed and diffused in the outer absorbent part 1, but it will still be absorbed by the inner reinforced absorbent part 2 of the inner layer. The sponge-like porous structure itself is conducive to the flow and diffusion of liquid. Therefore, this utility model makes good use of the composite structure of the sponge-like absorbent layer, which is designed for the characteristics of human body structure, to enhance the absorption performance locally. Through its own sponge-like porous and loose spatial configuration, the menstrual blood can be locally seeped into and diffused in the core by the squeezing of the product by human body activities, reducing the retention of menstrual blood on the surface of the absorbent core. The passive flow process of menstrual blood is similar to the squeezing and pumping of liquid, guiding the menstrual blood to other unabsorbed parts of the absorbent core. Therefore, the absorbent core described in this utility model can form a soft and lightweight product with good absorption and surface dryness performance and improved material utilization.

[0025] Furthermore, the inclusion of the inner reinforced absorbent section 2 makes the absorbent core structure more ergonomically designed, while also enhancing absorbency in specific areas. This effectively alleviates the discomfort caused by a damp and sticky surface on the sanitary napkin. Through a process similar to that of a sponge—constantly squeezing, transporting, diffusing, and absorbing—the surface of the outer absorbent section 1 remains as dry as possible until the inner reinforced absorbent section 2 is fully saturated. Therefore, this type of sponge-like composite absorbent core is highly suitable for use as the absorbent layer in feminine hygiene products.

[0026] Regarding the selection of the width and length of the inner reinforced absorbent section 2, a width range of 3-5cm and a length range of 6-15cm can meet the production and usage needs of most sanitary napkin specifications. Considering that the inner reinforced absorbent section 2 can exhibit a greater liquid absorption capacity compared to the outer absorbent section 1, the absorbency of the inner reinforced absorbent section 2 can be changed by adjusting the weight or changing the thickness, thereby changing the undulation of the sanitary napkin surface layer to better adapt to the physiological structure of the human body and exert a more efficient absorption effect.

[0027] As a technological supplement, combined with Figure 1 and Figure 2 The diagram shows a cross-sectional structure of the sponge-like composite absorbent core of this invention applied to a conventional sanitary napkin product. It includes at least a sanitary napkin surface layer 6, a sanitary napkin bottom layer 7, and sanitary napkin wings 8, or other alternative structures with similar or equivalent functions. The sponge-like composite absorbent core is incorporated into these structures to form a fully functional sanitary napkin product. Furthermore, the sponge-like composite absorbent core can be adapted to meet the requirements of manufacturers and the usage habits of general consumers, making it more suitable for the product's usage scenarios. This includes, but is not limited to, structural improvements such as: adding embossed patterns to the surface of the sponge-like composite absorbent core, adding a wrapping layer to the sponge-like composite absorbent core, and further composited with absorbent materials on top of the sponge-like composite absorbent core, etc.

[0028] In one preferred embodiment of this utility model, the weight per square meter of the inner reinforced absorbent part 2 is greater than or equal to the weight per square meter of the outer absorbent part 1. This arrangement allows the adsorption capacity of the inner reinforced absorbent part 2 to be significantly greater than that of the outer absorbent part 1. This facilitates the flow and diffusion of menstrual blood and other fluids from the top surface A of the outer absorbent part to the bottom surface B of the outer absorbent part according to the difference in osmotic pressure, thereby achieving the desired effect of guiding menstrual blood. Furthermore, the effect of squeezing and pumping liquids similar to that of a sponge is better, and the absorption rate and surface dryness of the absorbent core are also superior.

[0029] Based on the above embodiments, the present invention has the following improvements: the basis weight of the inner reinforcing absorbent part 2 is 100~300 gsm, and the basis weight of the outer absorbent part 1 is 50~150 gsm. Generally, integer values ​​are commonly used, such as 50, 60, 70, 80, 90...120, 130, 140, 150, etc. The higher the basis weight, the greater the absorption capacity, and the longer the liquid diffusion and infiltration time will be, and vice versa. By setting the above values, the product can meet the aforementioned absorption performance while ensuring that the absorbent core prepared by the product is not too heavy or too thick. On the one hand, the product's absorption performance is taken into account, and on the other hand, the production cost can be reasonably controlled, which is conducive to improving the production efficiency of enterprises.

[0030] In one preferred embodiment of this utility model, the outer absorbent part 1 is a rectangle or rectangular shape with a width of 6-10cm and a length of 12-15cm. The above dimensions facilitate the inner and outer wrapping of the inner reinforcing absorbent part 2 and meet the production requirements of sanitary napkin products under general specifications. The length of the inner reinforcing absorbent part 2 is preferably shorter than the length of the outer absorbent part 1, which can ensure that the absorbent core meets the absorption performance requirements and facilitates the company to reduce the production cost of the absorbent core.

[0031] In one preferred embodiment of this utility model, the absorbent covering layer 20 is one or two of a paper sheet, a hydrophilic woven sheet, or a hydrophilic nonwoven sheet.

[0032] Combination Figure 1 and Figure 3 As shown in the figure, in one preferred embodiment of the present invention, the center of the inner reinforced absorbent part 2 along its length is located in the region between 1 / 5 node and 1 / 2 node along the length of the outer absorbent part 1, including the positions of the two endpoints at the 1 / 5 node and 1 / 2 node. Referring to the positions shown in the figure, arranging the inner reinforced absorbent part 2 at the above-mentioned positions allows the absorbent core's absorbency to better conform to the physiological structure of the human body. Furthermore, by setting it in different positions, the product can meet the needs of daytime or nighttime use. For example, when the inner reinforced absorbent part 2 is closer to the end of the absorbent core along its length, the product is more suitable for use as a daytime sanitary napkin; while when the inner reinforced absorbent part 2 is closer to the middle of the absorbent core along its length, it is suitable for use as a nighttime sanitary napkin.

[0033] Combination Figure 1 and Figure 4 As shown, in one of the preferred embodiments of this utility model, the two sides of the outer absorption part 1 overlap each other after being folded inward, and the overlapping parts also overlap with the normal projection of the inner reinforcing absorption part 2 on the top surface A of the outer absorption part. The above-mentioned arrangement can improve the absorption performance of the absorption core on the one hand, and the thickened middle part can indirectly push the core structure towards the square shape of the top surface A of the outer absorption part on the other hand. When the thickness of the inner reinforcing absorption part 2 is large enough, it will cause the local position of the absorption core to protrude, which is closer to the body structure characteristics of the human body and helps to improve the flow, diffusion and adsorption efficiency of the absorption core. Based on this, combined Figure 1 , Figure 3 and Figure 5As shown, in one preferred embodiment of the present invention, the inner reinforcing absorbent part 2, which is wrapped in the interlayer formed after the outer absorbent part 1 is folded, pushes a portion of the outer absorbent part 1 toward the top surface of the outer absorbent part, forming at least one protruding guide part 11 on the top surface of the outer absorbent part. The protruding guide part 11 can be formed by protruding through the folded overlapping area described in the aforementioned embodiment, or by thickening the inner reinforcing absorbent part 2 and / or pressing down the outer absorbent part 1 before protruding. Regardless of the method, the local protrusion effect of the absorbent core can be achieved, making the product closer to the body structure characteristics of the human body. Based on this, the product of the present invention exhibits a strong guiding and seeping effect on liquids, and makes full use of the sponge-like structural characteristics of the product of the present invention to absorb liquids.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A sponge-like composite absorbent core, comprising an outer absorbent portion (1) and an inner reinforcing absorbent portion (2) composed of a sponge-like absorbent layer, wherein the sponge-like absorbent layer is a porous layered material with an indeterminate length and width boundary in cross-section having upper, middle, and lower three-layered characteristics, the upper and lower layers being wood pulp fiber layers (3), and the middle layer being a meltblown fiber layer (5) mixed with superabsorbent polymer particles (4), wherein the wood pulp fiber layer (3) and the meltblown fiber layer (5) are interleaved at adjacent boundaries, characterized in that: The outer absorbent part (1) is formed by folding the two sides of the rectangular, square, rectangular or square sponge-like absorbent layer inward, and forming a fold (10) in the center and adjacent area. The side with the fold (10) is the bottom surface of the outer absorbent part, and the opposite side is the top surface of the outer absorbent part. The inner reinforcing absorbent part (2) is a rectangle or a near rectangle with a width of 3-5 cm and a length of 6-15 cm. It consists of a sponge-like absorbent layer and a water-absorbing covering layer (20) disposed on the opposite sides of the sponge-like absorbent layer. It is wrapped in the interlayer formed after the outer absorbent part (1) is folded.

2. The sponge-like composite absorbent core according to claim 1, characterized in that: The weight per square meter of the inner reinforcing absorbent part (2) is greater than or equal to the weight per square meter of the outer absorbent part (1).

3. The sponge-like composite absorbent core according to claim 1, characterized in that: The weight of the inner strengthening absorption part (2) is 100~300 gsm, and the weight of the outer absorption part (1) is 50~150 gsm.

4. The sponge-like composite absorbent core according to claim 1, characterized in that: The external absorption part (1) is a rectangle or a rectangular shape with a width of 6-10cm and a length of 12-15cm.

5. The sponge-like composite absorbent core according to claim 1, characterized in that: The absorbent covering layer (20) is one or two of the following: a paper sheet, a hydrophilic woven sheet, or a hydrophilic nonwoven sheet.

6. The sponge-like composite absorbent core according to claim 1, characterized in that: The center of the inner strengthening absorption part (2) in the length direction is located in the area between the 1 / 4 node and the 1 / 2 node in the length direction of the outer absorption part (1), and includes the positions of the two endpoints, the 1 / 5 node and the 1 / 2 node.

7. The sponge-like composite absorbent core according to claim 1, characterized in that: The two sides of the outer absorption part (1) overlap each other at least once after being folded inward, and the overlapping parts also overlap with the normal projection of the inner reinforcing absorption part (2) on the top surface of the outer absorption part.

8. The sponge-like composite absorbent core according to claim 1, characterized in that: The inner reinforcing absorption part (2) in the interlayer formed after the outer absorption part (1) is folded up pushes a part of the outer absorption part (1) toward the top surface of the outer absorption part, forming at least one protruding guide part (11) on the top surface of the outer absorption part.

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