Thin and soft instant absorption core body

Abstract

The utility model belongs to the technical field of absorption products, and particularly relates to a thin and soft instant absorption core body which comprises an absorption core body, the absorption core body comprises a liquid guide and moisture insulation layer, a breathable fixing layer and an absorption liquid storage layer, and the absorption liquid storage layer comprises fibers and water absorption materials. Compared with glue bonding, fiber composite point bonding provides a fluffy space for a water absorption material, the absorption capacity and the ventilation effect of the absorber are improved, the absorption performance of the absorption core body is improved, and meanwhile the absorption performance of the water absorption core body is improved. The softness and breathability are kept. The interaction force between the lower surface of the liquid guide and moisture insulation layer and water molecules is higher than that between the upper surface of the liquid guide and moisture insulation layer and the water molecules, liquid permeates and diffuses from the liquid guide and moisture insulation layer to the absorption liquid storage layer more quickly, the absorption performance is further enhanced, the upper surface is kept relatively dry and comfortable, and the wearing comfort is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of absorbent products, and in particular relates to a thin and soft instantaneous absorbent core. Background Art

[0002] The traditional wood pulp core process is to use hot melt adhesive to bond wood pulp and small white paper. Due to the amount of hot melt adhesive used and the way it is applied, the overall product may be thicker, which not only increases the weight and cost of the product, but also may affect the wearing comfort and breathability of the product. The conductivity of hot melt adhesive is relatively poor, which may cause the conduction speed of urine in the absorbent core to slow down. Therefore, this type of product is thicker and has poor conductivity, which affects the dryness and breathability of the product after multiple absorption. In order to solve the above problems, composite paper wood pulp cores have appeared on the market.

[0003] For example, a rapid diversion absorbent core (announcement number: CN215606923U, announcement date: 2022-01-25), includes a core body and a non-woven fabric coated on the outer surface of the core body, and the longitudinal direction extending along the length direction of the core body is defined as the longitudinal direction, and the width direction extending along the width direction is defined as the lateral direction. The core body includes expanded paper, and a first polymer water-absorbent resin layer is provided on the upper surface of the expanded paper, and bulky cotton is provided on the upper surface of the first polymer water-absorbent resin layer. A second polymer water-absorbent resin layer is provided on the upper surface of the bulky cotton, and a wood pulp layer is provided on the second polymer water-absorbent resin layer. Bulk cotton strips are provided on both lateral sides of the upper surface of the wood pulp layer, and a flow channel for facilitating the diversion of excrement is formed by two bulky cotton strips, the non-woven fabric and the wood pulp layer.

[0004] The absorbent core naturally forms grooves through two spaced-apart bulky cotton strips, which then form flow channels with the non-woven fabric and wood pulp layer, which is beneficial to the flow and diffusion of excrement. The double-layer polymer absorbent resin layer increases the water absorption, and the high infiltration rate and air permeability of the core body are increased by the set flow channels, wood pulp layer and bulky cotton. However, the absorbent core is composed of a mixture of wood pulp and absorbent resin layers wrapped in non-woven fabric. After hot pressing, the product is hard and has poor composite strength, which affects the expansion space of the absorbent resin. How to improve the absorption performance of the absorbent core while maintaining a soft and breathable experience is a direction that absorbent products need to study. Utility Model Content

[0005] In view of the technical defects existing in the background technology, the utility model proposes a thin and soft instant absorption core, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0006] A thin and soft instantaneous absorption core comprises: an absorption core, wherein the absorption core comprises a liquid-conducting and moisture-isolating layer arranged at the top, a breathable fixing layer arranged at the bottom, and an absorption liquid storage layer arranged between the liquid-conducting and moisture-isolating layer and the breathable fixing layer, wherein the interaction force between the lower surface of the liquid-conducting and moisture-isolating layer and water molecules is stronger than the interaction force between the upper surface and water molecules, and the absorption liquid storage layer is a U-shaped structure which is thin in the middle and thick at both ends along the longitudinal direction, and the absorption liquid storage layer comprises fibers and water-absorbing materials, and the absorption liquid storage layer is compositely connected with the liquid-conducting and moisture-isolating layer and the breathable fixing layer by heating to soften the fibers inside the absorption liquid storage layer to form composite points.

[0007] As a further technical solution of the utility model, the upper surface of the liquid-conducting and moisture-isolating layer is sprayed with a weak affinity surfactant, and the lower surface of the liquid-conducting and moisture-isolating layer is sprayed with a strong affinity surfactant.

[0008] As a further technical solution of the utility model, the liquid-conducting and moisture-isolating layer and the breathable fixing layer are one of spunbonded non-woven fabric and hot air non-woven fabric.

[0009] As a further technical solution of the utility model, the absorption and liquid storage layer also includes wood pulp and water-absorbing resin, and the U-shaped structure is made by crushing and mixing fibers, wood pulp and water-absorbing resin and then demolding them through a mold.

[0010] As a further technical solution of the utility model, the absorption and liquid storage layer has a gram weight of 100-200 gsm.

[0011] As a further technical solution of the utility model, the fiber is ES fiber, and the fiber length is 3-10 mm.

[0012] As a further technical solution of the utility model, the liquid-conducting and moisture-isolating layer, the liquid-absorbing and storing layer and the breathable and fixing layer are laminated together by heating and pressurizing with a hot pressing roller.

[0013] As a further technical solution of the utility model, the hot pressing roller is provided with an embossed pattern, and the absorbent core is heated and pressurized by the embossed pattern on the hot pressing roller to form strip-shaped embossed points. The strip-shaped embossed points are composite points formed by the interaction of the surface macromolecular chains of the fibers with the surface macromolecular chains of the liquid-conducting and moisture-isolating layer and the breathable fixing layer after the fibers are heated to form adhesive composite points.

[0014] The beneficial effects of the utility model are:

[0015] The utility model is composed of a liquid-conducting and moisture-insulating layer, an absorbent liquid-storing layer and a breathable fixed layer. The absorbent liquid-storing layer is rich in fiber and the fibers inside are softened by heating to form a composite point bonding liquid-conducting and moisture-insulating layer and a breathable fixed layer. Compared with glue bonding, the fiber composite point bonding provides fluffy space for the water-absorbing material, improves the absorption capacity and breathability of the absorbent, and makes the absorbent core improve the absorption performance while maintaining softness and breathability. At the same time, it reduces the wood pulp content, solving the shortcomings of the traditional composite paper wood pulp core being hard, etc.

[0016] The interaction force between the lower surface of the liquid-conducting and moisture-isolating layer of the utility model and water molecules is stronger than the interaction force between the upper surface and water molecules, so that liquid penetrates and diffuses faster from the liquid-conducting and moisture-isolating layer to the liquid-absorbing and storage layer, further enhancing the absorption performance, keeping the upper surface relatively dry, and improving wearing comfort. The liquid-absorbing and storage layer of the utility model is a U-shaped structure that is thin in the middle and thick at both ends, which fits the body and effectively prevents side leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded diagram of the structure of a thin and soft instant-absorbing absorbent core.

[0018] Figure 2 It is a schematic diagram of the structure of a thin and soft instantaneous absorption core.

[0019] Figure 3 It is a hot pressed roller pattern for a thin, soft, instant absorbent core.

[0020] Among them: a liquid-conducting and moisture-isolating layer 1, strip-shaped embossed dots 11, an absorbing and liquid-storing layer 2, a U-shaped structure 21, and a breathable and fixed layer 3. DETAILED DESCRIPTION

[0021] The following is combined with Figures 1 to 3 The implementation methods of the present invention are described with relevant embodiments, but the implementation methods of the present invention are not limited to the following embodiments, and the present invention involves relevant necessary components in this technical field, which should be regarded as the known technology in this technical field and can be known and mastered by the technicians in this technical field.

[0022] The utility model provides a thin and soft instantaneous absorption core body, such as Figure 1 and Figure 2 As shown, it comprises: an absorbent core, the absorbent core comprises a liquid-conducting and moisture-insulating layer 1 arranged at the top, a breathable and fixed layer 3 arranged at the bottom, and an absorbent liquid storage layer 2 arranged between the liquid-conducting and moisture-insulating layer 1 and the breathable and fixed layer 3. The absorbent liquid storage layer 2 comprises fibers and water-absorbing materials, and the absorbent liquid storage layer 2 is compositely connected with the liquid-conducting and moisture-insulating layer 1 and the breathable and fixed layer 3 by heating and softening the fibers inside the absorbent liquid storage layer 2 to form composite points.

[0023] The utility model is composed of a liquid-conducting and moisture-isolating layer 1, an absorbing and storing layer 2 and a breathable and fixed layer 3. The absorbing and storing layer 2 is rich in fiber and the internal fibers are softened by heating to form composite points to bond the liquid-conducting and moisture-isolating layer 1 and the breathable and fixed layer 3. Compared with glue bonding, the fiber composite point bonding provides fluffy space for the water-absorbing resin, improves the absorption capacity and breathability of the absorbent body, and enables the absorption core to improve the absorption performance while maintaining softness and breathability.

[0024] The interaction force between the lower surface of the liquid-conducting and moisture-insulating layer 1 and water molecules is stronger than the interaction force between the upper surface and water molecules, so that liquid penetrates and diffuses faster from the liquid-conducting and moisture-insulating layer 1 to the liquid-absorbing and liquid-storing layer 2, further enhancing the absorption performance, keeping the upper surface relatively dry, and improving wearing comfort. The liquid-absorbing and liquid-storing layer 2 is a U-shaped structure 21 that is thin in the middle and thick at both ends along the longitudinal direction, which fits the body and effectively prevents side leakage.

[0025] More specifically, the absorbent core plays a vital role in absorbent products and is the core part that determines the performance of absorbent products. The absorbent core usually adopts a three-layer structure, including an upper layer, a middle layer and a lower layer. The upper layer and the lower layer are usually composed of one or more fibrous absorbent materials, while the middle layer is a mixture of fibrous absorbent materials and water-absorbent resins. The absorbent core is usually located below the surface layer, which receives the liquid transferred from the surface layer. When the liquid contacts the absorbent core, it is first quickly absorbed by the fibrous absorbent material in the upper layer. Then, due to capillary action, the liquid is diffused into the entire core layer, including the middle layer and the lower layer. The middle layer quickly absorbs and locks the liquid through its strong water absorption capacity to prevent liquid backflow and leakage.

[0026] As people's requirements for the performance of absorbent products continue to increase, the design and materials of the absorbent core are also constantly innovating and optimizing. For example, using lighter, thinner and more breathable materials to make the wrapping layer to improve breathability and softness; increasing the amount of water-absorbing materials in the middle layer to improve absorption performance; using a new composite absorbent core structure to improve absorption speed and diffusion performance, etc. The absorbent core of an absorbent product is a key part to achieve rapid absorption, uniform distribution and storage of liquid. By optimizing the material combination and structural design, the performance of the absorbent core can be continuously improved to meet people's higher demands for absorbent products.

[0027] From the user's perspective, the absorbent core should have the following properties: 1) It should be able to quickly absorb liquid and reduce the time the liquid stays on the skin surface, thereby keeping the surface dry; 2) It should be able to absorb a large amount of liquid and prevent back-seepage and leakage to ensure the dryness and comfort of the user; 3) It should have good breathability to help reduce dampness and stuffiness; 4) It should have good softness to reduce friction and discomfort with the skin. In summary, the absorbent core should have high absorbency, good breathability and softness.

[0028] At present, the common types of absorbent cores on the market include wood pulp cores, composite cores and partitioned cores. Traditional wood pulp cores are made by mixing wood pulp and absorbent resin. Because wood pulp and SAP are mixed disorderly and the structure is relatively loose, it may cause problems such as lumps and faults. This type of product is thicker and has poor conductivity, which affects the dryness and breathability of absorbent products. The partitioned core can better adapt to the absorption needs of different parts by designing the core into multiple areas, but if the partition design is unreasonable, it may affect the overall absorption effect, softness and comfort. Combined with the performance characteristics that the above-mentioned absorbent core should have, wood pulp cores and partitioned cores are not feasible solutions.

[0029] The composite core is made of non-woven fabric and water-absorbing material through machine pressing. This core structure is more compact and not easy to clump and break. Based on the composite core solution, the utility model adopts a liquid-conducting and moisture-isolating layer 1, an absorbent liquid storage layer 2 and a breathable fixed layer 3, and on this basis solves the problem of how to improve the absorption performance of the absorbent core while maintaining a soft and breathable experience.

[0030] First of all, how to ensure that the middle layer of the absorbent core is composited with the upper and lower layers to ensure the connection strength while not affecting the softness and air permeability of the absorbent core. The previous absorbent core composite method, whether using adhesives or bonding layers, will affect the air permeability of the absorbent core. If no adhesive is used, the structure of the absorbent material is relatively loose, which will affect the connection strength of the absorbent core. The utility model adds fibers to the absorbent liquid storage layer 2, heats the fibers to soften them to form composite points, and composites the three-layer structure of the absorbent core together. Using fibers for composite can strengthen the structural connection between the absorbent materials and composite the three-layer structure together. This composite method provides fluffy space for the absorbent resin, improves the absorption capacity and air permeability of the absorbent, and enables the absorbent core to improve the absorption performance while remaining soft and breathable.

[0031] Secondly, the interaction force between the lower surface of the liquid-conducting and moisture-isolating layer 1 used in the utility model and water molecules is stronger than the interaction force between the upper surface and water molecules. The interaction force between an interval and water molecules represents the hydrophilicity of the interval. When a material is said to have strong hydrophilicity, it means that the interaction force between the material and water molecules is very strong, and it can quickly absorb and retain moisture. On the contrary, if the hydrophilicity of the material is weak, it means that the interaction force between it and water molecules is small, and it may not be easy to absorb or retain moisture. In other words, the hydrophilicity of the lower surface of the liquid-conducting and moisture-isolating layer 1 of the utility model is stronger than that of the upper surface, which can promote the transfer of liquid from the liquid-conducting and moisture-isolating layer 1 to the absorptive liquid storage layer 2, further accelerating the water absorption rate of the liquid.

[0032] As one of the preferred embodiments of the utility model, a weak affinity surfactant is sprayed on the upper surface of the liquid-conducting and moisture-isolating layer 1, and a strong affinity surfactant is sprayed on the lower surface of the liquid-conducting and moisture-isolating layer 1. The property that the lower surface of the liquid-conducting and moisture-isolating layer 1 is more hydrophilic than the upper surface may be related to the material or surface treatment. In this embodiment, a weak affinity surfactant is sprayed on the upper surface of the liquid-conducting and moisture-isolating layer 1, and a strong affinity surfactant is sprayed on the lower surface of the liquid-conducting and moisture-isolating layer 1, so that the lower surface of the liquid-conducting and moisture-isolating layer 1 is more hydrophilic than the upper surface.

[0033] At the same time, the spraying amount of the weak affinity surfactant and the strong affinity surfactant on the liquid-conducting and moisture-insulating layer 1 is 0.2%-2% respectively. Within this range, it can prevent the excessive spraying amount of surfactant from destroying the stability of the surface layer, causing the structure of the liquid-conducting and moisture-insulating layer 1 to be unbalanced, and the surface tension of the liquid-conducting and moisture-insulating layer 1 to be reduced, making it easier to absorb pollutants and dust; it can also prevent the excessive spraying amount of surfactant from affecting the speed of liquid transfer of the liquid-conducting and moisture-insulating layer 1, thereby affecting the absorption speed of the absorbent core.

[0034] Furthermore, the weak affinity surfactant adopts the surfactant of German Kekai model 1327C, and the strong affinity surfactant adopts the surfactant of model 6807-4.

[0035] As one of the preferred embodiments of the utility model, the liquid-conducting and moisture-insulating layer 1 and the breathable and fixed layer 3 are one of spunbonded nonwoven fabrics and hot air nonwoven fabrics. The main materials of spunbonded nonwoven fabrics are polyester and polypropylene, and they have the characteristics of high strength, high temperature resistance, low temperature resistance, aging resistance, UV resistance, high elongation, good stability and breathability, corrosion resistance, sound insulation, mothproof, and non-toxicity. If the liquid-conducting and moisture-insulating layer 1 and the breathable and fixed layer 3 are made of spunbonded nonwoven fabrics, they have good breathability.

[0036] Hot air non-woven fabric is a type of hot air bonding non-woven fabric. After the fibers are combed, the hot air on the drying equipment is used to penetrate the fiber web, so that it is heated and bonded to form a non-woven fabric. The principle of hot air bonding is to use hot air on the drying equipment to penetrate the fiber web so that it is heated and melted to produce bonding. It has the characteristics of being fluffy, soft, elastic, and warm. If the liquid-conducting and moisture-insulating layer 1 and the breathable fixing layer 3 are made of hot air non-woven fabric, it has good softness.

[0037] As one of the preferred embodiments of the utility model, the absorption liquid storage layer 2 also includes wood pulp and water-absorbing resin, and the U-shaped structure 21 is made by demolding the fibers, wood pulp and water-absorbing resin after being crushed and mixed. Compared with the traditional wood pulp absorption core, this embodiment adds fibers to reduce the amount of wood pulp, and the low and thin wood pulp content can solve the shortcomings of the traditional composite paper wood pulp core being too hard. The U-shaped structure 21 is made by demolding the mold, which is simple and quick to make, and has the effect of preventing side leakage.

[0038] As one of the preferred embodiments of the utility model, the weight of the liquid-absorbing and liquid-storing layer 2 is 100-200 gsm. The weight of the liquid-absorbing and liquid-storing layer 2 in this range can prevent the weight from being too large, which will cause the overall thickness of the absorbent core to increase the discomfort of the wearer and hinder air circulation, resulting in reduced air permeability of the product; it can also prevent the weight from being too small, which will cause the overall absorption capacity of the absorbent core to decrease, and the liquid cannot be effectively absorbed and stored, thereby affecting the use effect of the absorbent core.

[0039] As one of the preferred embodiments of the utility model, the fiber is ES fiber. ES fiber is a synthetic fiber, which is produced by a "two-step method" of "melt spinning + hot drawing" or a "one-step method" of "melt spinning and drawing" using common raw materials such as polyethylene (PE), polypropylene (PP), and polyester (PET). ES fiber has a two-component skin-core structure, with the skin layer having a low melting point and good softness, and the core layer having a high melting point and high strength. After heat treatment, a part of the skin layer melts and acts as a bond, while the rest remains in a fiber state, and has the characteristic of low thermal shrinkage.

[0040] At the same time, ES fiber has the characteristics of softness, comfort, breathability, wear resistance and tear resistance. The ES fiber used in this embodiment can improve the softness and breathability of the absorption and storage layer 2, and can be heated and softened and then composited with other materials.

[0041] Furthermore, the fiber length is 3-10mm. The longer the fiber length, the higher its strength and stiffness are generally. This is because long fibers can increase the cohesion and friction of the material, making the bond between the fiber and the matrix stronger, thereby improving the strength and stiffness of the composite material. However, the increase in fiber length will affect the uniformity of fiber dispersion and the wettability of the resin to the fiber, resulting in a decrease in interface bonding strength and a significant decrease in mechanical properties. The fiber length in this range can balance the cohesion between the fiber and the material and the bonding strength between the fiber and the interface.

[0042] As one of the preferred embodiments of the present invention, the liquid-conducting and moisture-isolating layer 1, the liquid-absorbing and storing layer 2 and the breathable and fixed layer 3 are laminated together by heating and pressurizing with a hot pressing roller. Figure 3 As shown, the hot pressing roller is provided with an embossed pattern, and the absorbent core is heated and pressurized by the embossed pattern on the hot pressing roller to form a strip embossed point 11. The strip embossed point 11 is a composite point formed by the interaction of the surface macromolecular chains of the fiber and the surface macromolecular chains of the liquid-conducting and moisture-isolating layer 1 and the breathable fixing layer 3 after the fiber is heated to form a bonded composite point.

[0043] When the liquid-conducting and moisture-isolating layer 1, the absorbent liquid-storage layer 2 and the breathable fixed layer 3 pass through the hot pressing roller together, the upper and lower molds of the heating roller are provided with embossing patterns, and the positions in contact with the embossing patterns are squeezed and heated. At this time, the fibers in the absorbent liquid-storage layer 2 are heated by the embossing patterns, and the macromolecular chains inside them will gradually become active as the temperature rises, thereby causing the fibers to soften. When the fibers are heated to a certain temperature, the macromolecular chains on their surface will become more active, thereby interacting with the macromolecular chains on the lower surface of the liquid-conducting and moisture-isolating layer 1 and the macromolecular chains on the upper surface of the breathable fixed layer 3 to form a bond. Therefore, the strip-shaped embossed points 11 formed on the absorbent core are the composite points after the fibers are heated, softened and bonded. The absorbent core is compounded through these composite points, and the remaining places provide fluffy space for the water-absorbent resin, thereby improving the absorption capacity and breathability of the absorbent.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A thin and soft instantaneous absorption core, characterized in that: include: An absorbent core, the absorbent core comprising a liquid-conducting and moisture-isolating layer (1) arranged at the top, a breathable and fixed layer (3) arranged at the bottom, and an absorbent liquid storage layer (2) arranged between the liquid-conducting and moisture-isolating layer (1) and the breathable and fixed layer (3), wherein the interaction force between the lower surface of the liquid-conducting and moisture-isolating layer (1) and water molecules is stronger than the interaction force between the upper surface and water molecules, the absorbent liquid storage layer (2) is a U-shaped structure (21) which is thin in the middle and thick at both ends along the longitudinal direction, the absorbent liquid storage layer (2) comprises fibers and water-absorbing materials, and the absorbent liquid storage layer (2) is compositely connected to the liquid-conducting and moisture-isolating layer (1) and the breathable and fixed layer (3) by heating and softening the fibers inside the absorbent liquid storage layer (2) to form composite points.

2. The thin and soft instantaneous absorption core according to claim 1, characterized in that: The upper surface of the liquid-conducting and moisture-isolating layer (1) is sprayed with a weak affinity surfactant, and the lower surface of the liquid-conducting and moisture-isolating layer (1) is sprayed with a strong affinity surfactant.

3. The thin and soft instantaneous absorption core according to claim 1, characterized in that: The liquid-conducting and moisture-isolating layer (1) and the breathable fixing layer (3) are either spunbonded non-woven fabric or hot air non-woven fabric.

4. The thin and soft instantaneous absorption core according to claim 1, characterized in that: The absorption and liquid storage layer (2) also includes wood pulp and water-absorbing resin, and the U-shaped structure (21) is made by crushing and mixing fibers, wood pulp and water-absorbing resin and then demoulding through a mold.

5. The thin and soft instantaneous absorption core according to claim 1, characterized in that: The absorption and liquid storage layer (2) has a gram weight of 100-200 gsm.

6. The thin and soft instantaneous absorption core according to claim 1, characterized in that: The fiber is ES fiber, and the fiber length is 3-10 mm.

7. The thin and soft instantaneous absorption core according to claim 1, characterized in that: The liquid-conducting and moisture-isolating layer (1), the liquid-absorbing and storing layer (2) and the breathable and fixing layer (3) are laminated together by means of heating and pressurizing with a hot pressing roller.

8. The thin and soft instantaneous absorption core according to claim 7, characterized in that: The hot pressing roller is provided with an embossed pattern, and the absorbent core is heated and pressurized by the embossed pattern on the hot pressing roller to form stripe-shaped embossed points (11). The stripe-shaped embossed points (11) are composite points formed by the interaction between the surface macromolecular chains of the fiber after heating and the surface macromolecular chains of the liquid-conducting and moisture-isolating layer and the breathable fixing layer to form adhesion.

Images