Composite core

Abstract

The utility model relates to the technical field of hygienic products, and discloses a composite core body which comprises a surface layer, the surface layer is connected with an isolating layer, the isolating layer is connected with an absorbing layer made of composite materials, the absorbing layer is connected with a bottom layer, and the surface layer is provided with a flow guide structure which is used for distributing liquid and dredging the liquid to the lower layer. According to the composite core body, the liquid on the surface layer is shunted by the flow guide structure, and the shunted liquid can simultaneously permeate into the lower layer from different heights, so that the core body can quickly absorb the liquid in a short time under the condition that the absorption amount is relatively large, and the absorption efficiency of the core body is improved; liquid permeating from the surface layer penetrates through the isolation layer to be absorbed by the absorption layer, the bottom layer plays a role in bearing, the isolation layer isolates the absorption layer from the surface layer, so that the liquid in the absorption layer is blocked by the isolation layer, when the core body is used, after the core body is subjected to external pressure, the liquid absorbed by the absorption layer reversely permeates upwards, and the isolation layer plays a role in buffering the reverse osmosis liquid. Therefore, the reverse osmosis resistance of the composite core body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sanitary products, in particular to a composite core body. Background Technique

[0002] Daily necessities, also known as household items, are items commonly used by ordinary people and are necessities of life. That is, household items. Sanitary napkins, diapers, etc. all belong to the sanitary products among daily necessities. Their main materials are cotton, non-woven fabric, pulp, etc. They are divided into three layers from the inside to the outside: a surface layer, an absorption core, and a bottom layer.

[0003] For common sanitary products on the market, their absorption cores are usually fluff pulp core body structures, generally made of a mixture of fluff pulp and superabsorbent resin. The overall core body structure is relatively thick. In the case of a large absorption amount, it is difficult for the absorption core to quickly absorb the liquid in a short time, and due to the action of external pressure during actual use, the absorption core is prone to reverse osmosis. Content of the Utility Model

[0004] The purpose of the utility model is to provide a composite core body to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A composite core body, comprising: a surface layer, the surface layer is connected to an isolation layer, the isolation layer is connected to an absorption layer made of a composite material, the absorption layer is connected to a bottom layer, and a diversion structure is arranged on the surface layer, and the diversion structure is used for diverting liquid and guiding it downward.

[0006] Preferably, the diversion structure is a concave part, and the concave part is a groove pressed on the surface layer by a hot pressing process.

[0007] Preferably, the depth of the concave part is 0.05 mm to 0.1 mm.

[0008] Preferably, the diversion structure is a drainage hole, and a plurality of the drainage holes are opened on the surface layer.

[0009] Preferably, a plurality of the drainage holes are arranged in an array, the distance between two adjacent drainage holes in the horizontal direction is 2 mm to 5 mm, and the distance between two adjacent drainage holes in the vertical direction is 3 mm to 8 mm.

[0010] Preferably, the aperture of the drainage hole is 0.05 mm to 0.2 mm.

[0011] Preferably, the surface layer is made of non-woven fabric.

[0012] Preferably, the isolation layer is made of fluffy cotton.

[0013] Preferably, the absorption layer is made of a blend obtained by reacting superabsorbent resin with fluff pulp.

[0014] Preferably, the bottom layer is made of dry-laid nonwoven fabric.

[0015] The composite core has the following beneficial effects:

[0016] 1. For this composite core, the diversion structure diverts the liquid on the surface layer, and the diverted liquid can penetrate downward into the lower layer simultaneously from different heights, enabling the core to quickly absorb the liquid within a short time when the absorption amount is large, thus improving the absorption efficiency of the core.

[0017] 2. For this composite core, the liquid penetrating from the surface layer passes through the isolation layer and is absorbed by the absorption layer. The bottom layer plays a supporting role. The isolation layer isolates the absorption layer from the surface layer, blocking the liquid in the absorption layer. When in use, after the core is subjected to external pressure, the liquid absorbed by the absorption layer will reverse osmose upward, and the isolation layer plays a buffering role for the reverse osmosis liquid, thereby improving the anti-reverse osmosis ability of the composite core. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the composite core provided by the embodiment of the present application;

[0019] Figure 2 is an exploded view of the composite core provided by the embodiment of the present application;

[0020] Figure 3 is a top view of the surface layer provided with a concave portion;

[0021] Figure 4 is an overall schematic diagram of the surface layer of the composite core provided with a concave portion;

[0022] Figure 5 is a top view of the surface layer provided with drainage holes;

[0023] Figure 6 is an overall schematic diagram of the surface layer of the composite core provided with drainage holes.

[0024] In the figure: 1. Surface layer; 2. Isolation layer; 3. Absorption layer; 4. Bottom layer; 5. Concave portion; 6. Drainage hole. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] Such as Figure 1 - Figure 2As shown in the figure, the present utility model provides an embodiment of a composite core, including: a surface layer 1, which is made of non-woven fabric. The non-woven fabric includes, but is not limited to, non-woven cloth, melt-blown cloth, and nanofiber cloth. In this embodiment, the non-woven fabric is non-woven cloth, and the non-woven cloth is spunbond non-woven fabric. The spunbond non-woven fabric has good air permeability, which helps to reduce the accumulation of heat and moisture, improve the use feeling, and has good water absorption performance. It can quickly absorb liquid and rapidly diffuse the liquid, effectively improving the absorption capacity of the composite core. In addition, the spunbond non-woven fabric has high strength and good wear resistance, and can withstand strong stretching and tearing, which can improve the strength of the composite core.

[0027] Specifically, as Figure 3 - Figure 4 shown, a diversion structure is provided on the top surface of the surface layer 1. The diversion structure is used to divert the liquid and guide it downward to the lower layer. In this embodiment, the diversion structure is a concave portion 5. The concave portion 5 is a groove pressed on the surface layer 1 by a hot pressing process. The depth of the concave portion 5 is 0.05 mm to 0.1 mm. Setting the concave portion 5 can make the top surface of the surface layer 1 form a concave-convex shape. Part of the liquid on the surface layer 1 can be diverted into the concave portion 5. The liquid in the concave portion 5 has a shorter downward penetration distance and a shorter downward penetration time, and will reach the lower layer faster. Compared with the liquid in the concave portion 5, the liquid in other areas of the surface layer 1 has a longer downward penetration distance and time. Therefore, the liquid on the surface layer 1 can penetrate downward into the lower layer from different heights at the same time, enabling the core to quickly absorb the liquid in a short time when the absorption amount is large, and improving the absorption efficiency of the core.

[0028] It can be understood that, as Figure 5 - Figure 6 shown, in some other embodiments, the diversion structure can also be a drainage hole 6. The drainage hole 6 is a through hole. A plurality of drainage holes 6 are provided on the surface layer 1. The plurality of drainage holes 6 are arranged in an array. The distance between two adjacent drainage holes 6 in the horizontal direction is 2 mm to 5 mm, and the distance between two adjacent drainage holes 6 in the vertical direction is 3 mm to 8 mm. The aperture of the drainage hole 6 is 0.05 mm to 0.2 mm. Setting the drainage hole 6 can enable part of the liquid on the surface layer 1 to directly flow downward through the drainage hole 6 to the lower layer without being transported to the lower layer by the way of downward penetration. When the absorption amount is large, the drainage hole 6 can divert part of the liquid, reducing the penetration pressure of the surface layer 1, so that the core can quickly absorb the liquid in a short time, and improving the absorption efficiency of the core.

[0029] Moreover, the diversion structure can make the top surface of the surface layer 1 form a texture, thereby increasing the friction of the surface layer 1, making it difficult for the entire core to shift.

[0030] As Figure 1 - Figure 2As shown, the surface layer 1 is connected to the isolation layer 2. The isolation layer 2 is made of fluffy cotton. Fluffy cotton has good moisture absorption performance and can quickly absorb the sweat or moisture on the body surface, and rapidly disperse and discharge it. This helps to keep the user's skin dry, improve comfort, and increase the diversion ability of the isolation layer 2. Moreover, there are many gaps between the fluffy cotton fibers, which can not only store air to form a heat insulation layer and provide good warmth retention effect in winter, but also allow air to flow freely, thus having good breathability. Due to the relatively high roughness of the fluffy cotton, a surface layer 1 made of non-woven fabric is provided above the isolation layer 2, which can make the surface of the entire core body smoother and improve the comfort of the user.

[0031] Furthermore, the isolation layer 2 is connected to an absorption layer 3 made of a composite material. The absorption layer 3 is made of a blend obtained by the reaction of a water-absorbing resin and fluff pulp. The water-absorbing resin is a type of polymer material that can absorb and retain a large amount of liquid and has a strong water absorption ability. The water-absorbing resin can rapidly expand to form a gel when absorbing water through its internal cross-linked network structure, thereby capturing and retaining a large amount of water. Specifically, the polymer chains in the water-absorbing resin expand in water, enabling water molecules to be embedded in the polymer network and firmly locked in the gel structure through the action of hydrogen bonds and ionic bonds. Among them, the water-absorbing resin includes but is not limited to polyacrylate, polyvinyl alcohol, and modified cellulose. At the same time, fluff pulp has long fibers, high fiber strength, good elasticity, strong moisture absorption, and good wear resistance. Therefore, when combined with the water-absorbing resin, it can form a structure that can efficiently absorb and retain liquid, which is beneficial to maintaining the distribution and locking ability of the liquid, thereby improving comfort and also enhancing the stability and service life of the core body.

[0032] Furthermore, the absorption layer 3 is connected to a bottom layer 4. The bottom layer 4 is made of dry-process papermaking non-woven fabric. The dry-process papermaking non-woven fabric is heat-sealed dust-free paper. The heat-sealed dust-free paper has excellent breathability and liquid permeability, can absorb the liquid not absorbed by the absorption layer 3, prevent liquid leakage due to excessive liquid, and enable the bottom layer 4 to have good bearing capacity for the upper layer and liquid. Through special manufacturing processes and material treatments, the heat-sealed dust-free paper can reduce the dust and fiber shedding on the paper surface, and no powders and glues are used in the production process of the heat-sealed dust-free paper, thus avoiding the generation of dust and pollutants and making the composite core body cleaner. In some embodiments, the dust-free paper is comprehensive dust-free paper, which is usually made of degradable cellulose materials, environmentally friendly and sustainable, so that the bottom layer 4 will not have a negative impact on the environment and helps to reduce the use of non-degradable materials such as plastics.

[0033] It can be understood that in this application, the connection method between adjacent layers is heat-pressing connection at the edge or using hot-melt adhesive connection, and the composite core body has fewer layers and a simple structure, which is convenient for production.

[0034] In addition, the composite core has fewer layers, making the entire core structure thinner, lighter and easier to carry, and further reducing costs.

[0035] In this application, the liquid infiltrating from the surface layer 1 passes through the isolation layer 2 and is absorbed by the absorption layer 3. The bottom layer 4 plays a supporting role. The isolation layer 2 isolates the absorption layer 3 from the surface layer 1, preventing the liquid in the absorption layer 3 from passing through. When in use, after the core is subjected to external pressure (the sitting, lying or reclining postures of the user will exert pressure on the core), the liquid absorbed by the absorption layer 3 will reverse osmosis upward. The isolation layer 2 plays a buffering role for the reverse osmosis liquid, thus improving the anti-reverse osmosis ability of the composite core.

[0036] Working principle: The diversion structure diverts the liquid on the surface layer 1. The diverted liquid can infiltrate downward into the lower layer at the same time from different heights. The liquid infiltrating from the surface layer 1 passes through the isolation layer 2 and is absorbed by the absorption layer 3. The bottom layer 4 plays a supporting role. The isolation layer 2 isolates the absorption layer 3 from the surface layer 1, preventing the liquid in the absorption layer 3 from passing through.

[0037] In summary, although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite core, characterized in that: include: A surface layer (1), the surface layer (1) is connected to an isolation layer (2), the isolation layer (2) is connected to an absorption layer (3) made of a composite material, and the absorption layer (3) is connected to a bottom layer (4); The surface layer (1) is provided with a flow guiding structure, and the flow guiding structure is used to divert the liquid and guide it to the lower layer.

2. A composite core according to claim 1, characterized in that: The flow-guiding structure is a concave portion (5), and the concave portion (5) is a groove formed by pressing the surface layer (1) through a hot pressing process.

3. A composite core according to claim 2, characterized in that: The depth of the concave portion (5) is 0.05 mm to 0.1 mm.

4. A composite core according to claim 1, characterized in that: The flow-guiding structure is a flow-guiding hole (6), and the surface layer (1) is provided with a plurality of the flow-guiding holes (6).

5. A composite core according to claim 4, characterized in that: The plurality of drainage holes (6) are distributed in an array, and the distance between two adjacent drainage holes (6) in the transverse direction is 2 mm to 5 mm, and the distance between two adjacent drainage holes (6) in the longitudinal direction is 3 mm to 8 mm.

6. A composite core according to claim 4, characterized in that: The diameter of the drainage hole (6) is 0.05 mm to 0.2 mm.

7. A composite core according to claim 1, characterized in that: The surface layer (1) is made of non-woven fabric.

8. A composite core according to claim 1, characterized in that: The isolation layer (2) is made of fluffy cotton.

9. A composite core according to claim 1, characterized in that: The absorption layer (3) is made of a blend obtained by reacting a water-absorbing resin with fluff pulp.

10. A composite core according to claim 1, characterized in that: The bottom layer (4) is made of dry-laid papermaking nonwoven fabric.

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