Absorbing core layer

Abstract

The utility model discloses an absorption core layer which comprises an upper layer, a middle layer and a lower layer, the upper layer, the middle layer and the lower layer are mutually bonded to form a bonding portion, the upper layer is made of flow guide materials, the middle layer is made of barrier materials, the lower layer is made of water locking materials, the middle layer is provided with a through hole communicated with the upper face and the lower face, and the area of the horizontal section of the through hole is gradually increased from the upper layer to the lower layer. And the upper layer is provided with filter holes communicated with the through holes. Liquid firstly flows to the upper layer, the upper layer still drains the liquid, but part of the liquid enters the through holes through the filtering holes, the through holes are in a big-end-down funnel shape, the liquid rapidly flows downwards to the lower layer and is absorbed by the lower layer to lock water, and therefore most of the liquid on the upper layer enters the lower layer through the filtering holes and the through holes. The water absorption capacity of the middle-layer foaming sponge is reduced, so that in the core body pressing process, due to insufficient water storage in the foaming sponge, the liquid reverse osmosis capacity is greatly reduced, meanwhile, part of liquid can be stored in the through holes, and the water absorption capacity of the absorption core is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of absorbent cores, in particular to an absorbent core layer. Background Art

[0002] With the rapid development of the hygiene products market, consumers have higher and higher requirements for hygiene products. As a key part of hygiene products, the absorbent core layer plays a role in absorbing and storing a large amount of liquid. The quality of its performance directly affects the liquid absorption quality and use time of hygiene products.

[0003] Although the structure of the existing absorbent core has the characteristic of rapid water absorption, it is generally a simple vertical stacking of multiple sheets. Often, the absorbent material of the lower layer can only participate in the absorption after the upper layer absorbs moisture fully. This makes the upper layer easy to reverse seep after being saturated with moisture. Therefore, some manufacturers will distinguish between the upper and lower layers when selecting absorbent materials for the absorbent core, using materials with a slower absorption rate for the upper layer and materials with a faster absorption rate for the lower layer.

[0004] However, although replacing the absorbent material in the absorbent core can absorb water efficiently, it is limited by the overall simple hierarchical structure of the absorbent core and still has problems such as hierarchical saturation absorption, slow infiltration speed, and a large amount of reverse osmosis. Utility Model Content

[0005] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the utility model is to provide an absorbent core layer to accelerate liquid penetration and reduce reverse osmosis.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an absorbent core layer, comprising an upper layer, a middle layer and a lower layer, wherein the upper layer, the middle layer and the lower layer are bonded to each other to form a bonding portion, the upper layer is a flow-guiding material, the middle layer is a barrier material, and the lower layer is a water-locking material, the middle layer is provided with a through hole connecting the upper and lower layers, the horizontal cross-section of the through hole gradually increases in area from the upper layer to the lower layer, and the upper layer is provided with a filter hole connected to the through hole.

[0007] Furthermore, the upper layer is a spunbond flow-guiding non-woven fabric.

[0008] Furthermore, the upper layer is a hot air guide non-woven fabric.

[0009] Furthermore, the middle layer is a foam sponge.

[0010] Furthermore, the lower layer is a spunlace nonwoven fabric.

[0011] Furthermore, the lower layer is wood pulp spunlace nonwoven fabric.

[0012] Furthermore, the lower layer is absorbent paper.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the liquid first flows to the upper layer, diffuses in the longitudinal and transverse directions of the upper layer, and at the same time the upper layer drains the liquid, but some of the liquid enters the through hole through the filter hole. Because the through hole is a funnel-shaped hole that is small at the top and large at the bottom, the lower the liquid entering the through hole goes, the larger the inner diameter of the through hole becomes. Under the action of the surface tension of water, the liquid will flow downward to the lower layer quickly and be absorbed and locked by the lower layer. Therefore, most of the liquid on the upper layer will enter the lower layer through the filter hole and the through hole, reducing the water absorption of the middle-layer foam sponge. Therefore, during the process of the core being compressed, the liquid reverse osmosis amount is greatly reduced due to insufficient water storage in the foam sponge. In addition, the foam sponge has a certain thickness and has a certain elastic recovery ability under pressure, so that it has a barrier effect. At the same time, some of the liquid can also be stored in the through hole, increasing the water absorption of the absorbent core. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the product structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the core structure of the utility model.

[0016] In the figure: 1, upper layer; 2, middle layer; 3, lower layer; 4, filter holes; 5, through holes; 6, bonding part. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2 This embodiment provides an absorbent core layer, including an upper layer 1, a middle layer 2 and a lower layer 3. The upper layer 1 is made of a flow-conducting material; the middle layer 2 is made of a barrier material; and the lower layer 3 is made of a water-locking material. The liquid is quickly drained through the upper layer 1, and then transferred to the lower layer 3 through the middle layer 2 for absorption and water lock. When the core is under pressure, the liquid absorbed by the lower layer 3 will partially seep out, and the barrier material of the middle layer 2 will play a certain blocking effect, reducing the reverse osmosis.

[0019] Specifically, the material of the upper layer 1 in this embodiment is hot air guide cloth, and other embodiments may also use spunbond guide cloth and other materials. It mainly plays a guiding role, quickly absorbs the liquid on the upper layer 1, and conducts it downward; the material of the middle layer 2 is foam sponge, because it has a pore structure inside, which facilitates the downward flow of liquid. At the same time, the foam sponge has a very light density, which has the advantage of being easy to use. In this embodiment, the gram weight of the foam sponge is in the range of 100g to 300g. At the same time, the independent closed-cell structure of the foam sponge effectively prevents the penetration of water molecules, reduces the reverse osmosis water rate, and the modified environment also makes it impossible for bacteria to survive; the material of the lower layer 3 is spunlace non-woven fabric, and other embodiments may also use wood pulp spunlace non-woven fabric or absorbent paper, etc. The main reason is that the porosity of the spunlace non-woven fabric is relatively high, so it has good air permeability, and it also has good water absorption, and can lock liquid well. In this embodiment, the gram weight of the spunlace non-woven fabric is in the range of 40g to 100g.

[0020] Although the above three-layer absorbent core can absorb liquid efficiently, it is limited by the overall hierarchical structure of the core body, and the liquid still needs to gradually penetrate layer by layer before it can be absorbed and locked by the water-locking material of the lower layer 3. As a result, the liquid infiltration speed is slow, increasing the probability of reverse osmosis.

[0021] When the foam sponge in the middle layer 2 is conducting the liquid, the holes in the foam sponge will absorb the liquid to a certain extent, that is, the liquid will first fill the holes in the foam sponge, and then conduct the liquid to the lower layer 3 through capillary phenomenon, so that part of the liquid will be stored in the foam sponge. During the process of the core being compressed, part of the liquid in the foam sponge will reversely osmose, increasing the amount of liquid reverse osmosis.

[0022] To solve the above technical problems, the middle layer 2 is provided with a through hole 5 connecting the upper and lower layers, the horizontal cross section of the through hole 5 gradually increases from the upper layer 1 to the lower layer 3, for example, the vertical cross section is a funnel shape with a small top and a large bottom, and the upper layer 1 is provided with a filter hole 4 connected to the through hole 5.

[0023] The liquid first flows to the upper layer 1 and diffuses in the longitudinal and transverse directions of the upper layer 1. At the same time, the upper layer 1 drains the liquid, but some of the liquid enters the through hole 5 through the filter hole 4. Because the through hole 5 is a funnel shape with a small top and a large bottom, the lower the liquid entering the through hole 5 goes, the larger the inner diameter of the through hole 5 becomes. Under the action of the surface tension of water, the liquid will flow downward to the lower layer 3 quickly and be absorbed and locked by the lower layer 3. Therefore, most of the liquid on the upper layer 1 will enter the lower layer 3 through the filter hole 4 and the through hole 5, reducing the absorption amount of the foam sponge in the middle layer 2. Therefore, during the process of the core being compressed, the liquid reverse osmosis amount is greatly reduced due to insufficient liquid storage in the foam sponge. In addition, the foam sponge has a certain thickness and has a certain elastic recovery ability under pressure, so that it has a barrier effect. At the same time, some liquid can also be stored in the through hole 5 to increase the liquid absorption amount of the core.

[0024] The through hole 5 can be processed by acupuncture, by heating the needle tip and then quickly inserting the needle tip into the core. Since the middle layer 2 is a foam sponge, the foam sponge at the needle tip will be scalded when heated, thereby forming a conical hole.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. An absorbent core layer, comprising an upper layer (1), a middle layer (2) and a lower layer (3), wherein the upper layer (1), the middle layer (2) and the lower layer (3) are bonded to each other to form a bonding portion (6), characterized in that: The upper layer (1) is a flow-guiding material, the middle layer (2) is a barrier material, and the lower layer (3) is a water-locking material. The middle layer (2) is provided with a through hole (5) connecting the upper and lower layers, and the horizontal cross-section of the through hole (5) gradually increases in area from the upper layer (1) to the bottom. The upper layer (1) is provided with a filter hole (4) connected to the through hole (5).

2. The absorbent core layer according to claim 1, characterized in that The upper layer (1) is a spunbonded flow-guiding non-woven fabric.

3. The absorbent core layer according to claim 1, characterized in that: The upper layer (1) is a hot air diversion non-woven fabric.

4. The absorbent core layer according to claim 1, characterized in that: The middle layer (2) is a foamed sponge.

5. The absorbent core layer according to claim 1, characterized in that: The lower layer (3) is a spunlace non-woven fabric.

6. The absorbent core layer according to claim 1, characterized in that: The lower layer (3) is a wood pulp spunlace non-woven fabric.

7. The absorbent core layer according to claim 1, characterized in that: The lower layer (3) is absorbent paper.

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