High-absorbency core and sanitary product

Abstract

The present invention relates to the field of absorbent products, specifically a high-absorbent core and sanitary products. The high-absorbent core comprises: a contact surface layer, an ion adsorption layer, an absorption layer and a fixed bottom layer arranged in sequence, characterized in that the ion adsorption layer comprises: a hydrophilic base layer, and cationic adsorption particles distributed in the hydrophilic base layer, and the absorption layer comprises: an elastic absorption layer and a composite wood pulp layer. The invention realizes an effective functional separation of ion adsorption and liquid absorption, and proposes an ion adsorption layer with a simple structure and a low production process difficulty. Before the liquid enters the absorption layer, the ions that reduce the effect of the adsorption material are filtered, thereby eliminating the interference of inorganic salt ions, improving the absorption performance, increasing the water absorption rate, reducing the amount of the absorption material, and saving costs.

Description

Technical Field

[0001] The present invention relates to the field of absorbent products, and more particularly to a high-absorbency core and sanitary products. Background Art

[0002] The absorbent core is the main functional part of sanitary products such as diapers, pull-up pants, diapers and sanitary napkins, and is the most important core of absorbent sanitary products to absorb urine or menstrual blood. In existing absorbent cores, the internal components that play the main role in absorbing water are mostly polymer absorbent resins. Polymer absorbent resins are also called sodium polyacrylate resins. The absorption rate of commonly used polymer absorbent resins for pure water is about 300 times its own weight. However, if used for the absorption of physiological saline, the absorption rate of polymer absorbent resins is only 50-55 times, which is only one-sixth of pure water. The reason for the decrease in the absorption rate of polymer absorbent resins is that physiological saline contains a large amount of inorganic salt ions. Inorganic salt ions will affect the permeability of liquids in polymer absorbent resins. Therefore, as the absorption time increases, the absorption capacity of the polymer absorbent resin in the absorbent core for liquid will continue to decrease. The main component of urine is water, but it also contains a small amount of inorganic salt ions. The presence of inorganic salt ions will affect the absorption performance of the absorbent core. Since the presence of inorganic salt ions in urine seriously restricts the absorption performance of the absorbent product itself, in order to achieve the design purpose, it is usually necessary to add an additional amount of polymer absorbent resin to meet the absorption design requirements of the product. Therefore, adsorption and filtration of inorganic salt ions can not only improve the absorption performance of the absorbent core, but also reduce the amount of polymer absorbent resin used, saving costs.

[0003] At present, in the design of absorbent cores, the common technical means for the adsorption and filtration of inorganic salt ions is to adopt the method of ion exchange. Among them, the most mature application is to replace part or all of the ordinary polymer water-absorbing resin with ion exchange resin as the main adsorbent of the absorbent core. However, ion exchange resin is an insoluble polymer particle, and its combination with diapers requires a complex process flow and high cost. Moreover, since the ion adsorption and liquid adsorption of ion exchange resin exist in one body, the adsorption and filtration of inorganic salt ions are both in the diaper. Such a combination makes the middle position of the absorbent core, which is most likely to contact the liquid, expand to a greater extent than other positions during the continuous absorption of urine. Since the absorption rate of the polymer water-absorbing resin after the inorganic salt ions are adsorbed is greatly improved, compared with the traditional design lacking inorganic salt ion adsorption, this local expansion deformation is very obvious, forming a greater pressure on the user and causing discomfort, but increasing the frequency of replacement of the absorbent core, which is not conducive to the effective use of the absorbent core. Summary of the invention

[0004] The present invention aims to overcome at least one defect of the above-mentioned prior art and provide a high-absorbency core and sanitary products, which are used to solve the problem that the inorganic salt ion adsorption materials provided in the existing disposable sanitary products to improve the absorption performance cause local large-scale expansion, resulting in discomfort and reducing the effective utilization of the absorption core.

[0005] The technical solution adopted by the present invention is a high-absorption core, including: a contact surface layer, an absorption layer and a fixed bottom layer, and also including the ion adsorption layer, the ion adsorption layer is arranged between the contact surface layer and the absorption layer, the ion adsorption layer includes: a hydrophilic base layer, and cationic adsorption particles arranged on the hydrophilic base layer, and the absorption layer includes: an elastic absorption layer and a composite wood pulp layer.

[0006] Super absorbent fibers are distributed in the hydrophilic base layer.

[0007] The elastic absorption layer is provided with a flow guiding channel, and the flow guiding channel is connected with the ion absorption layer and the composite wood pulp layer; the flow guiding channel divides the elastic absorption layer into a plurality of three-dimensional absorption blocks.

[0008] The flow guiding channel passes through the middle portion of the elastic absorption layer.

[0009] The elastic absorption layer includes a plurality of three-dimensional absorption blocks, and the three-dimensional absorption blocks include: a hollow wrapping bag and water-absorbing particles filled in the wrapping bag.

[0010] The three-dimensional absorption block is further provided with supporting wires, which are supported in the thickness direction of the three-dimensional absorption block and form a plurality of interconnected supporting spaces; the water-absorbing particles are located in the supporting spaces.

[0011] A liquid-permeable color-changing layer is also provided between the elastic absorption layer and the composite wood pulp layer, and the liquid-permeable color-changing layer is connected to the guide channel; the liquid-permeable color-changing layer forms at least one exposed surface on the absorption layer; the liquid-permeable color-changing layer includes an irreversible color-changing area located between the three-dimensional absorption block and the composite wood pulp layer, and a reversible color-changing area located in the guide channel.

[0012] The thickness ratio of the elastic absorption layer to the composite wood pulp layer is 7:3 to 9:1, the thickness of the composite wood pulp layer is 0.3 mm to 1 mm, and the fixed bottom layer is made of a transparent material so that the exposed surface is exposed outside the high-absorption core.

[0013] The composite wood pulp layer comprises a wood pulp surface layer, a composite resin layer and a wood pulp bottom layer which are arranged in sequence.

[0014] The composite resin layer is formed by compounding fluff pulp and high molecular water-absorbing resin.

[0015] Furthermore, a disposable sanitary product is provided, characterized in that it comprises the high-absorbency core described above.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: it realizes effective functional separation of ion adsorption and liquid absorption, proposes an ion adsorption layer with a simple structure and low production process difficulty, and filters the ions that reduce the effect of the adsorption material before the liquid enters the absorption layer, thereby eliminating the interference of inorganic salt ions, improving the absorption performance, increasing the water absorption rate, reducing the amount of absorption material, and saving costs. Through the three-dimensional design, the expansion shape after absorbing the liquid is effectively controlled, and a comfortable and uniform elastic support is provided. The setting of the guide channel not only actively drives the liquid to flow, avoiding local excessive deformation affecting comfort, but also greatly improves the absorption speed of the liquid and the overall absorption utilization rate. More importantly, the guide channel is left empty in the elastic absorption layer to form a breathable channel, which improves comfort. The setting of the liquid-permeable color-changing layer and the coordination of the composite wood pulp layer and the fixed bottom layer improve the full use of the absorption core. The structure of the composite absorption core with a double-layer core avoids squeezing the human body and is comfortable and breathable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side view of the high-absorbency core of the present invention.

[0018] Figure 2 It is a partially enlarged schematic diagram of the side surface of the high-absorbency core in the present invention.

[0019] Figure 3 It is a cross-sectional schematic diagram of the high-absorbency core in the present invention.

[0020] Figure 4 It is a partially enlarged schematic cross-sectional view of the high-absorbency core of the present invention.

[0021] Figure 5 It is a cross-sectional schematic diagram of the ion adsorption layer in the present invention.

[0022] Figure 6 It is a partially enlarged schematic diagram of the cross section of the ion adsorption layer in the present invention.

[0023] Figure 7 It is a schematic diagram of the decomposition of the high-absorbency core in the present invention.

[0024] Figure 8 It is a schematic diagram of the sanitary product in the present invention.

[0025] Explanation of the reference numerals: high-absorbency core 001, contact surface layer 100, ion adsorption layer 200, hydrophilic base layer 210, super absorbent fibers 211, cationic adsorption particles 220, absorption layer 300, elastic absorption layer 310, flow guide channel 311, three-dimensional absorption block 312, wrapping capsule 3121, absorbent particles 3122, supporting filaments 3123, composite wood pulp layer 320, wood pulp surface layer 321, composite resin layer 322, fluff pulp 3221, polymer absorbent resin 3222, wood pulp bottom layer 323, liquid-permeable color-changing layer 330, reversible color-changing zone 331, irreversible color-changing zone 332, fixed bottom layer 400. DETAILED DESCRIPTION

[0026] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, this embodiment is a high-absorption core 001, comprising: a contact surface layer 100, an absorption layer 300 and a fixed bottom layer 400, and also comprising: the ion adsorption layer 200, the ion adsorption layer 200 is arranged between the contact surface layer 100 and the absorption layer 300, the ion adsorption layer 200 comprises: a hydrophilic base layer 210, and cation adsorption particles 220 arranged on the hydrophilic base layer 210, and the absorption layer 300 comprises: an elastic absorption layer 310 and a composite wood pulp layer 320. As a preferred solution, the cation adsorption particles 220 are arranged in the hydrophilic base layer 210, which can improve the stability of the cation adsorption particles 220, so as to maintain the ability to continuously adsorb cations.

[0029] The contact surface layer 100 is a direct contact layer of the liquid to be absorbed. The liquid to be absorbed enters the interior of the high-absorbent core 001 through the contact surface layer 100; the ion adsorption layer 200 is used to adsorb inorganic salt ions that hinder the high-absorbent core 001 from absorbing liquid. The absorption layer 300 is used to absorb and store the liquid to be absorbed. The fixed bottom layer 400 is used to fix the high-absorbent core 001. The hydrophilic base layer 210 is used to accelerate the entry and passage of the liquid to be absorbed, as well as the attachment of the cationic adsorption particles 220. The cationic adsorption particles 220 are used to adsorb metal cations in the liquid to be absorbed. After the ion adsorption particles 220 are combined with the hydrophilic base layer 210, when urine reaches the hydrophilic base layer 210, the cations (inorganic salt ions) are adsorbed to filter out most of the cations in the urine. As the cations decrease, the absorption rate of the absorption layer 300 will be greatly improved. The elastic absorption layer 310 provides the first liquid absorption and better comfort. The composite wood pulp layer 320 is used to form the second liquid absorption.

[0030] By combining the cation adsorption particles 220 with the hydrophilic base layer 210, the design of the ion exchange resin with complicated processes in the prior art is greatly reduced, and a new inorganic salt ion adsorption method is proposed. By adsorbing cations, the hindering effect of inorganic salt ions in the liquid to be absorbed on the water-absorbing material is eliminated. Moreover, since the hydrophilic base layer 210 where the cation adsorption particles 220 are located mainly acts as a permeation effect rather than a water absorption effect, it avoids the existing situation where the ion exchange resin is used as the main absorbent, and the inorganic salt ions and water are adsorbed at the same time, resulting in the improvement of the water absorption effect in the unit area. After the liquid is completely absorbed by the local part of the absorption core, it will expand significantly in a small area, forming the adverse effect of reverse extrusion. Further, by combining the elastic absorption layer 310 with the composite wood pulp layer 320, two water-absorbing absorption layers 300 are formed to improve the water absorption effect.

[0031] Super absorbent fibers 211 are distributed in the hydrophilic base layer 210. The super absorbent fibers 211 are used to prevent slippage.

[0032] The super absorbent fibers 211 can increase the speed at which the liquid to be absorbed enters the ion adsorption layer 200 , so that the ion adsorption layer 200 can quickly absorb the liquid to be absorbed after contacting the liquid transferred from the contact surface layer 100 .

[0033] The elastic absorption layer 310 is provided with a flow guiding channel 311, and the flow guiding channel 311 is connected to the ion adsorption layer 200.

[0034] and the composite wood pulp layer 320. The guide channel 311 divides the elastic absorption layer into a plurality of three-dimensional absorption blocks 312. The guide channel 311 is used to guide the flow of the liquid to be absorbed. The three-dimensional absorption blocks 312 are used to form a first liquid absorption.

[0035] The provision of the guide channel 311 can quickly and evenly divert the liquid to be absorbed into the elastic absorption layer 310.

[0036] Thereby, the liquid to be absorbed is absorbed more evenly, avoiding large expansion caused by local long-term concentrated absorption. Under the action of the guide channel 311, the elastic absorption layer 310 and the composite wood pulp layer 320 absorb the incoming liquid at the same time, further improving the absorption speed while avoiding the elastic absorption layer 310 hindering the diffusion of the liquid in the composite wood pulp layer 320. On the other hand, the guide channel 311 forms a breathable channel and deformation space for the absorption layer 300. When the high-absorption core 001 is used for skin contact, it can effectively ensure the overall breathability, reduce excessive skin contact, and improve the comfort of use. The formation of the three-dimensional absorption block 312 not only provides an elastic and comfortable touch with a three-dimensional support feeling, but also maintains the stability of its own shape through independent designs, and further controls local deformation and protrusion.

[0037] The flow guiding channel passes through the middle portion of the elastic absorption layer.

[0038] The guide channel 311 passing through the middle can effectively guide and divert the middle position of the absorption layer 300 that is the first and most likely to contact the liquid to be tested, first avoiding excessive expansion of this position, thereby enhancing the guiding effect of the guide channel 311 and guiding the liquid to be uniformly absorbed by the elastic absorption layer 310 as a whole.

[0039] The elastic absorption layer 310 includes a plurality of three-dimensional absorption blocks 312, and the three-dimensional absorption blocks 312 include: a hollow wrapping capsule 3121, and water-absorbing particles 3122 filled in the wrapping capsule 3121. The wrapping capsule 3121 is used to limit the shape change of the three-dimensional absorption block 312 and maintain the basic shape of the three-dimensional absorption block 312. The water-absorbing particles 3122 are used to form the absorption effect of the three-dimensional absorption block 312 on the liquid to be absorbed.

[0040] The design of the wrapping capsule 3121 and the water-absorbing particles 3122 makes it easier to shape the three-dimensional absorption block 312.

[0041] On the other hand, the independent small volume design after segmentation increases the constraint on the expansion of the water-absorbing particles 3122, effectively improves the uniformity of the expansion of the absorption layer 300, and suppresses the problems of local deformation and uneven expansion.

[0042] like Figure 3 and Figure 4As shown, the three-dimensional absorption block 312 is further provided with support wires 3123, which can support the three-dimensional absorption block 312 in the thickness direction and form a plurality of interconnected support spaces; the water-absorbing particles 3122 are located in the support spaces. The support wires 3123 are used to provide support inside the three-dimensional absorption block 312 in the thickness direction.

[0043] The provision of the support wire 3123 can further maintain the stability of the overall structure and shape of the three-dimensional absorbent block 312, ensure that the water-absorbing particles 3122 can expand in any direction after absorbing moisture while maintaining a certain uniformity, further limit the overall deformation, and increase the overall softness and comfort.

[0044] A liquid-permeable color-changing layer 330 is also provided between the elastic absorption layer 310 and the composite wood pulp layer 320, and the liquid-permeable color-changing layer 330 is connected to the guide channel 311; the liquid-permeable color-changing layer 330 forms at least one exposed surface on the absorption layer 300; the liquid-permeable color-changing layer 330 includes an irreversible color-changing area 332 located between the three-dimensional absorption block 312 and the composite wood pulp layer 320, and a reversible color-changing area 331 located in the guide channel 311.

[0045] The liquid permeable color changing layer 330 is used to detect the diffusion state of the liquid to be absorbed in the absorption layer 300 to obtain the utilization degree of the high-absorption core 001. The exposed surface is used to display the state of the liquid permeable color changing layer 330 to the outside of the absorption layer 300. The irreversible color changing area 332 is used to continuously display the traces of the detection to show the current utilization degree of the absorption layer 300. The reversible color changing area 331 is used to display the current absorption state of the liquid to show whether it is currently in the liquid absorption process and the diffusion degree of the liquid in the absorption process.

[0046] By setting the liquid-permeable color-changing layer 330, not only can the current state of liquid absorption and the diffusion caused by the liquid amount be confirmed at any time during use, but also the utilization degree of the absorption layer 300 can be known, and reasonable replacement can be performed to avoid waste or excessive use.

[0047] The thickness ratio of the elastic absorption layer 310 to the composite wood pulp layer 320 is 7:3 to 9:1, the thickness of the composite wood pulp layer 320 is 0.3 mm to 1 mm, and the fixed bottom layer 400 is made of a transparent material so that the exposed surface is exposed outside the high-absorption core 001.

[0048] The thickness ratio and thickness further limit are used to realize that the change of the liquid permeable color-changing layer 330 can be observed through the composite wood pulp layer 320. With the transparent fixed bottom layer 400 made of transparent material, the color change of the liquid permeable color-changing layer 330 in the high-absorbent core 001 can be observed through the fixed bottom layer 400.

[0049] The thickness of the composite wood pulp layer 320 can be effectively controlled by limiting the proportion and thickness, thereby ensuring the color of the liquid-permeable color-changing layer 330 is transparent, and an exposed surface is formed on the bottom surface of the composite wood pulp layer 320. Effective observation of the entire liquid-permeable color-changing layer 330 from the outside is achieved without destroying the current installation state of the high-absorbency core 001.

[0050] The composite wood pulp layer 320 includes a wood pulp surface layer 321, a composite resin layer 322 and a wood pulp bottom layer 323 arranged in sequence. The wood pulp surface layer 321 is used to guide the liquid to be absorbed into the composite resin layer 322. The wood pulp surface layer 321 and the wood pulp bottom layer 323 form the upper and lower covering layers of the composite resin layer 322. The composite resin layer 322 is used to lock the liquid.

[0051] This structure is adopted to utilize the good drainage effect of wood pulp fibers to guide the liquid to be absorbed to quickly enter the interior of the absorption core, and then the composite resin layer 322 absorbs and locks the liquid.

[0052] The composite resin layer 322 is formed by compounding fluff pulp 3221 and high molecular water-absorbing resin 3222 .

[0053] The fluff pulp 3221 has excellent absorption capacity and can achieve efficient and rapid absorption in cooperation with the wood pulp surface layer 321, further increasing the amount of liquid absorbed while also ensuring that the liquid absorption speed is further increased, thereby reducing the problem of liquid leakage.

[0054] Example 2

[0055] This embodiment is a high-absorbent core 001, comprising: a contact surface layer 100, an ion adsorption layer 200, an absorption layer 300 and a fixed bottom layer 400 arranged in sequence, the ion adsorption layer 200 comprising: a hydrophilic base layer 210, and cationic adsorption particles 220 distributed in the hydrophilic base layer 210, the absorption layer 300 comprising: an elastic absorption layer 310 and a composite wood pulp layer 320. The contact surface layer 100 is a direct contact layer of the liquid to be absorbed. The liquid to be absorbed enters the interior of the high-absorbent core 001 through the contact surface layer 100; the ion adsorption layer 200 is used to absorb inorganic salt ions that hinder the high-absorbent core 001 from absorbing the liquid. The absorption layer 300 is used to absorb and store the liquid to be absorbed. The fixed bottom layer 400 is used to fix the high-absorbent core 001. The hydrophilic base layer 210 is used to accelerate the entry and passage of the liquid to be absorbed, and the attachment of the cationic adsorption particles 220. The cationic adsorption particles 220 are used to absorb metal cations in the liquid to be absorbed. The elastic absorbent layer 310 provides the first liquid absorption and better comfort. The composite wood pulp layer 320 is used to form the second liquid absorption.

[0056] In this embodiment, the contact surface layer 100 is a non-woven fabric, and the cationic adsorption particles 220 are nano-sulfonated polystyrene microspheres. The cationic adsorption particles 220 are completely infiltrated into the hydrophilic base layer 210 by padding or spraying. When the liquid to be absorbed passes through the ion adsorption layer 200, the metal cations in the liquid to be absorbed stay in the ion adsorption layer 200. Taking urine as an example, the metal cations are mainly sodium ions, which stay in the ion adsorption layer 200 after being adsorbed by the cationic adsorption particles 220. In the liquid to be absorbed after being adsorbed by the cations, the number of metal cations is sharply reduced or even completely adsorbed, and the remaining liquid passes through the hydrophilic base layer 210 into the absorption layer 300. The layers can be bonded by hot melt adhesive.

[0057] like Figure 5 and Figure 6 As shown, super absorbent fibers 211 are distributed in the hydrophilic base layer 210. The super absorbent fibers 211 are used to prevent slippage.

[0058] In this embodiment, the super absorbent fibers 211 may be SAF fibers, and are interspersed in the hydrophilic base layer 210 and are evenly distributed in the hydrophilic base layer 210 .

[0059] The elastic absorption layer 310 is provided with a flow guiding channel 311, and the flow guiding channel 311 is connected to the ion adsorption layer 200.

[0060] and the composite wood pulp layer 320; the guide channel 311 divides the elastic absorption layer into at least three three-dimensional absorption blocks 312. The guide channel 311 is used to guide the flow of the liquid to be absorbed. The three-dimensional absorption blocks 312 are used to form a first liquid absorption.

[0061] In this embodiment, the guide channel 311 is in the shape of a "cross", which ensures that the elastic absorption layer 310 is penetrated at both ends in the horizontal longitudinal direction and the horizontal transverse direction, thereby realizing the uniform diffusion and distribution of the liquid. Preferably, there are four or more three-dimensional absorption blocks 312. This embodiment shows a solution with four three-dimensional absorption blocks 312, and the four three-dimensional absorption blocks 312 are rectangular blocks of equal size. When the liquid to be absorbed penetrates into the absorption layer 300, a part of the liquid to be absorbed is first absorbed by the three-dimensional absorption blocks 312 in the elastic absorption layer 310. When the surface of the three-dimensional absorption block 312 partially locks the liquid, the absorption speed of the three-dimensional absorption block 312 decreases. The liquid that is not absorbed by the three-dimensional absorption block 312, together with the liquid that directly enters the "cross", is absorbed by the three-dimensional absorption block 312.

[0062] The liquid in the g-shaped guide channel 311 will quickly contact the composite wood pulp layer 320 and be absorbed by the composite wood pulp layer 320, ensuring a continuous high absorption speed.

[0063] The elastic absorption layer 310 includes a plurality of three-dimensional absorption blocks 312, each of which includes a hollow wrapping capsule 3121,

[0064] And water-absorbing particles 3122 filled in the wrapping capsule 3121. The wrapping capsule 3121 is used to limit the shape change of the three-dimensional absorption block 312 and maintain the basic shape of the three-dimensional absorption block 312. The water-absorbing particles 3122 are used to form the absorption effect of the three-dimensional absorption block 312 on the liquid to be absorbed.

[0065] In this embodiment, the wrapping bag 3121 is made of elastic non-woven fabric, and the water-absorbing particles 3122 are SAP particles.

[0066] The three-dimensional absorption block 312 is further provided with support wires 3123, which are supported in the thickness direction of the three-dimensional absorption block 312 and form a plurality of interconnected support spaces; the water-absorbing particles 3122 are located in the support spaces. The support wires 3123 are used to provide support inside the three-dimensional absorption block 312 in the thickness direction.

[0067] In this embodiment, the support wire 3123 can be specifically a spandex wire, and the two ends of the spandex wire are respectively connected to the upper surface and the lower surface of the wrapping bag 3121 to form a three-dimensional support inside the three-dimensional absorption block 312.

[0068] A liquid permeable color-changing layer 330 is also provided between the elastic absorption layer 310 and the composite wood pulp layer 320, and the liquid permeable color-changing layer 330 is connected to the guide channel 311; the liquid permeable color-changing layer 330 forms at least one exposed surface on the absorption layer 300; the liquid permeable color-changing layer 330 includes an irreversible color-changing area 332 located between the three-dimensional absorption block 312 and the composite wood pulp layer 320, and a reversible color-changing area 331 located in the guide channel 311. The liquid permeable color-changing layer 330 is used to detect the diffusion state of the liquid to be absorbed in the absorption layer 300, so as to obtain the utilization degree of the high-absorption core 001. The exposed surface is used to display the state of the liquid permeable color-changing layer 330 to the outside of the absorption layer 300. The irreversible color-changing area 332 is used to continuously display the traces of the detection, so as to show the utilization degree of the current absorption layer 300. The reversible color-changing area 331 is used to display the current absorption state of the liquid, so as to show whether it is currently in the liquid absorption process and the diffusion degree of the liquid in the absorption process.

[0069] In this embodiment, the irreversible color change area 332 adopts an irreversible temperature-sensitive color change material, and the reversible color change area 331 adopts a reversible temperature-sensitive color change material. The sensitive temperature of the reversible temperature-sensitive color change material is 35°C to 38°C. When the liquid to be absorbed penetrates into the elastic absorption layer 310, the reversible color change area 331 of the liquid permeable color change layer 330 in the "cross"-shaped diversion channel 311 in the elastic absorption layer 310 contacts the liquid to be absorbed, and the liquid temperature triggers the reversible color change area 331 to change color. When the liquid to be absorbed is completely absorbed, the temperature in the reversible color change area 331 gradually decreases, and the "cross"-shaped reversible color change area 331 returns to the initial color. Through the color change of the "cross"-shaped reversible color change area 331, it is possible to clearly observe from the outside of the absorption layer 300 whether liquid absorption is occurring, and at the same time, through the color change of the "cross"-shaped reversible color change area 331, the diversion and diffusion of the liquid to be absorbed inside the absorption layer 300 can be observed. After the irreversible color changing area 332 of the liquid permeable color changing layer 330 contacts the liquid transferred by the three-dimensional absorption block 312, the color changes depending on the temperature of the liquid. The color diffusion range and color depth in the irreversible color changing area 332 can be observed from the outside of the absorption layer 300. The current utilization rate of the absorption layer 300 can be known according to the color change. As the color diffusion range of the four irreversible color changing areas 332 corresponding to the three-dimensional absorption block 312 is large and the color change is deep, it indicates that the absorption utilization rate of the corresponding three-dimensional absorption block 312 is higher, and it can be judged in time that the high absorption core 001 needs to be replaced. If the color diffusion range is small and the color is light, it indicates that the absorption layer 300 has not been fully utilized, so it does not need to be replaced.

[0070] The thickness ratio of the elastic absorption layer 310 to the composite wood pulp layer 320 is 7:3 to 9:1, the thickness of the composite wood pulp layer 320 is 0.3 mm to 1 mm, and the fixed bottom layer 400 is made of a transparent material so that the exposed surface is exposed outside the high-absorbency core 001. The thickness ratio and the further restriction of the thickness are used to achieve the change of the liquid-permeable color-changing layer 330 that can be observed through the composite wood pulp layer 320. With the transparent fixed bottom layer 400 made of a transparent material, the color change of the liquid-permeable color-changing layer 330 in the high-absorbency core 001 can be observed from the outside through the fixed bottom layer 400.

[0071] In this embodiment, the composite wood pulp layer 320 has a thickness ratio of 8:2, a thickness of 0.5 mm, and a pure white color.

[0072] The composite wood pulp layer 320 includes a wood pulp surface layer 321, a composite resin layer 322 and a wood pulp bottom layer 323 arranged in sequence. The wood pulp surface layer 321 is used to guide the liquid to be absorbed into the composite resin layer 322. The wood pulp surface layer 321 and the wood pulp bottom layer 323 form the upper and lower covering layers of the composite resin layer 322. The composite resin layer 322 is used to lock the liquid.

[0073] The wood pulp surface layer 321 and the wood pulp bottom layer 323 cooperate to cover the composite resin layer 322. The wood pulp surface layer 321 is connected to the water-permeable color-changing layer, and the wood pulp bottom layer 323 is connected to the fixed bottom layer 400.

[0074] The composite resin layer 322 is formed by compounding fluff pulp 3221 and high molecular water-absorbing resin 3222 .

[0075] In this embodiment, the fluff pulp 3221 is formed into a flat block, and the polymer water-absorbing resin 3222 particles are evenly distributed in the fluff pulp 3221 block. The polymer water-absorbing resin 3222 particles are made of SAP material.

[0076] Example 3

[0077] like Figure 7 As shown, this embodiment is a disposable sanitary product, including a high-absorbent core 001. The high-absorbent core 001 includes: a contact surface layer 100, an ion adsorption layer 200, an absorption layer 300 and a fixed bottom layer 400 arranged in sequence, characterized in that the ion adsorption layer 200 includes: a hydrophilic base layer 210, and cationic adsorption particles 220 distributed in the hydrophilic base layer 210, and the absorption layer 300 includes: an elastic absorption layer 310 and a composite wood pulp layer 320. The contact surface layer 100 is a direct contact layer of the liquid to be absorbed. The liquid to be absorbed enters the interior of the high-absorbent core 001 through the contact surface layer 100; the ion adsorption layer 200 is used to absorb inorganic salt ions that hinder the high-absorbent core 001 from absorbing the liquid. The absorption layer 300 is used to absorb and store the liquid to be absorbed. The fixed bottom layer 400 is used to fix the high-absorbent core 001. The hydrophilic base layer 210 is used to accelerate the entry and passage of the liquid to be absorbed, and the attachment of the cationic adsorption particles 220.

[0078] The cation adsorption particles 220 are used to adsorb metal cations in the liquid to be absorbed. The elastic absorption layer 310 provides the first liquid absorption and better comfort. The composite wood pulp layer 320 is used to form the second liquid absorption. The contact surface layer 100 is a non-woven fabric, and the cation adsorption particles 220 are nano-sulfonated polystyrene microspheres. The cation adsorption particles 220 are completely penetrated into the hydrophilic base layer 210 by padding or spraying. When the liquid to be absorbed passes through the ion adsorption layer 200, the metal cations in the liquid to be absorbed remain in the ion adsorption layer 200. Taking urine as an example, the metal cations are mainly sodium ions, which are adsorbed by the cation adsorption particles 220 and remain in the ion adsorption layer 200. In the liquid to be absorbed after the cation adsorption, the number of metal cations is sharply reduced or even completely adsorbed, and the remaining liquid passes through the hydrophilic base layer 210 and enters the absorption layer 300.

[0079] The layers can be bonded together by hot melt adhesive. Super absorbent fibers 211 are distributed in the hydrophilic base layer 210. Super absorbent fibers 211

[0080] Used to avoid slippage. The super absorbent fiber 211 is specifically SAF fiber, and is interspersed in the hydrophilic base layer 210, and is evenly distributed in the hydrophilic base layer 210. The elastic absorption layer 310 is provided with a guide channel 311, which connects the ion adsorption layer 200 and the composite wood pulp layer 320; the guide channel 311 divides the elastic absorption layer into a plurality of three-dimensional absorption blocks 312. The guide channel 311 is used to guide the flow of the liquid to be absorbed. The three-dimensional absorption block 312 is used to form the first liquid absorption. The guide channel 311 is in the shape of a "cross", which ensures that the elastic absorption layer 310 is penetrated at both ends in the horizontal longitudinal direction and the horizontal transverse direction, thereby realizing the uniform diffusion distribution of the liquid.

[0081] Preferably, there are four or more three-dimensional absorption blocks 312. In this embodiment, a solution of four three-dimensional absorption blocks 312 is shown, and the four three-dimensional absorption blocks 312 are rectangular parallelepipeds of equal size. When the liquid to be absorbed penetrates into the absorption layer 300, a part of the liquid to be absorbed is first absorbed by the three-dimensional absorption blocks 312 in the elastic absorption layer 310. When the surface part of the three-dimensional absorption block 312 locks the liquid, the absorption speed of the three-dimensional absorption block 312 decreases. The liquid not absorbed by the three-dimensional absorption block 312, together with the liquid directly entering the "cross"-shaped diversion channel 311, will quickly contact the composite wood pulp layer 320 and be absorbed by the composite wood pulp layer 320, ensuring a continuous high absorption speed. The elastic absorption layer 310 includes a plurality of three-dimensional absorption blocks 312, and the three-dimensional absorption blocks 312 include: a hollow wrapping capsule 3121, and water-absorbing particles 3122 filled in the wrapping capsule 3121.

[0082] The wrapping bag 3121 is used to limit the appearance change of the three-dimensional absorption block 312 and maintain the basic shape of the three-dimensional absorption block 312.

[0083] The flow guide channel 311 passes through the middle of the elastic absorption layer 310. That is, the center of the "cross" is located at the elastic absorption layer 310.

[0084] Central location.

[0085] The water-absorbing particles 3122 are used to form the absorption effect of the three-dimensional absorption block 312 on the liquid to be absorbed. The wrapping capsule 3121 is made of elastic non-woven fabric, and the water-absorbing particles 3122 are SAP particles. A support wire 3123 is also provided in the three-dimensional absorption block 312, and the support wire 3123 is supported in the thickness direction of the three-dimensional absorption block 312, and forms a plurality of connected support spaces; the water-absorbing particles 3122 are located in the support space. The support wire 3123 is used to provide support in the thickness direction of the three-dimensional absorption block 312. The support wire 3123 is specifically a spandex wire, and the two ends of the spandex wire are respectively connected to the upper surface and the lower surface of the wrapping capsule 3121 to form a three-dimensional support inside the three-dimensional absorption block 312. A liquid-permeable color-changing layer 330 is also provided between the elastic absorption layer 310 and the composite wood pulp layer 320, and the liquid-permeable color-changing layer 330 is connected to the guide channel 311; the liquid-permeable color-changing layer 330 forms at least one exposed surface on the absorption layer 300.

[0086] The liquid permeable color-changing layer 330 includes an irreversible color-changing area 332 located between the three-dimensional absorbent block 312 and the composite wood pulp layer 320.

[0087] and a reversible color changing area 331 located in the guide channel 311. The liquid permeable color changing layer 330 is used to detect the diffusion state of the liquid to be absorbed in the absorption layer 300 to obtain the utilization degree of the high-absorption core 001. The exposed surface is used to display the state of the liquid permeable color changing layer 330 to the outside of the absorption layer 300. The irreversible color changing area 332 is used to continuously display the traces of the detection to show the utilization degree of the current absorption layer 300. The reversible color changing area 331 is used to display the current absorption state of the liquid to show whether it is currently in the liquid absorption process and the diffusion degree of the liquid in the absorption process. The irreversible color changing area 332 adopts an irreversible temperature-sensitive color changing material, and the reversible color changing area 331 adopts a reversible temperature-sensitive color changing material.

[0088] The sensitive temperature of the reversible temperature-sensitive color-changing material is 35° C. to 38° C. When the liquid to be absorbed penetrates into the elastic absorption layer 310

[0089] When the reversible color changing area 331 of the liquid permeable color changing layer 330 in the "X" shaped flow guiding channel 311 in the elastic absorption layer 310 contacts the liquid to be absorbed, and the temperature of the liquid triggers the reversible color changing area 331 to change color. When the liquid to be absorbed is completely absorbed, the temperature in the reversible color changing area 331 gradually decreases, and the "X" shaped reversible color changing area 331 returns to its original color.

[0090] The color change of the "X"-shaped reversible color changing area 331 can be used to clearly observe whether liquid absorption is occurring from the outside of the absorption layer 300, and the diversion and diffusion of the liquid to be absorbed inside the absorption layer 300 can be observed through the color change of the "X"-shaped reversible color changing area 331. After the irreversible color changing area 332 of the liquid permeable color changing layer 330 contacts the liquid transferred by the three-dimensional absorption block 312, the color changes depending on the temperature of the liquid.

[0091] The color diffusion range and color depth in the irreversible color change area 332 can be observed from the outside of the absorption layer 300. The current utilization rate of the absorption layer 300 can be known based on the color change. As the color diffusion range of the four irreversible color change areas 332 of the corresponding three-dimensional absorption block 312 is large and the color change is deep, it indicates that the absorption utilization rate of the corresponding three-dimensional absorption block 312 is higher, and it can be judged in time that the high-absorption core 001 needs to be replaced. If the color diffusion range is small and the color is light, it indicates that the absorption layer 300 has not been fully utilized and therefore does not need to be replaced. The thickness ratio of the elastic absorption layer 310 to the composite wood pulp layer 320 is 7:3 to 9:1, the thickness of the composite wood pulp layer 320 is 0.3mm to 1mm, and the fixed bottom layer 400 is made of a transparent material so that the exposed surface is exposed outside the high-absorption core 001.

[0092] The thickness ratio and further restrictions on thickness are used to achieve the observation of changes in the liquid-permeable color-changing layer 330 through the composite wood pulp layer 320. The transparent fixed bottom layer 400 made of transparent material is used to make it possible for the outside to observe the color changes of the liquid-permeable color-changing layer 330 in the high-absorbency core 001 through the fixed bottom layer 400. The thickness ratio of the composite wood pulp layer 320 is 8:2, the thickness is 0.5 mm, and the color is pure white. The composite wood pulp layer 320 includes a wood pulp surface layer 321, a composite resin layer 322, and a wood pulp bottom layer 323 arranged in sequence. The wood pulp surface layer 321 is used to guide the liquid to be absorbed into the composite resin layer 322. The wood pulp surface layer 321 and the wood pulp bottom layer 323 form the upper and lower covering layers of the composite resin layer 322. The composite resin layer 322 is used to lock in liquid. The wood pulp surface layer 321 and the wood pulp bottom layer 323 cooperate to cover the composite resin layer 322. The wood pulp surface layer 321 is connected to the water-permeable color-changing layer, and the wood pulp bottom layer 323 is connected to the fixed bottom layer 400 .

[0093] The composite resin layer 322 is composited by fluff pulp 3221 and polymer water-absorbing resin 3222. The fluff pulp 3221 is formed into a flat block, and the polymer water-absorbing resin 3222 particles are evenly distributed in the fluff pulp 3221 block. The polymer water-absorbing resin 3222 particles are made of SAP material. When the high-absorbent core 001 is used in disposable sanitary products, such as diapers, it first realizes the effective functional separation of ion adsorption and liquid absorption. An ion adsorption layer 200 with a simple structure and low production process difficulty is proposed, which realizes the filtration of ions that reduce the effect of the adsorption material before the liquid enters the absorption layer 300. Through the method of adsorption and penetration, the metal cations in the urine, that is, the sodium ions, are adsorbed by the cation adsorption particles 220 in the hydrophilic base layer 210, so that the sodium ions are separated from the urine, thereby eliminating the interference of the sodium ions on the composite adsorption layer.

[0094] Secondly, the absorption layer 300 used as the liquid absorption core has a three-dimensional design. The three-dimensional absorption block not only realizes the effective control of the expansion shape when the urine is absorbed, but also provides a comfortable and uniform elastic support. The setting of the diversion channel 311 not only actively drives the urine to flow, avoids the local excessive deformation affecting the comfort, but also greatly improves the absorption speed of urine and the overall absorption utilization rate. More importantly, the diversion channel 311 is left empty in the elastic absorption layer 310 to form a breathable channel, so that when it is used in contact with the skin, it provides breathing space for the skin, avoids the skin and the diaper from being completely attached for a long time, thereby reducing the occurrence of diaper rash. The setting of the liquid permeable color-changing layer 330 and the cooperation of the composite wood pulp layer 320 and the fixed bottom layer 400 make it possible to observe whether urination is currently being observed from the outside of the diaper, and can better control the frequency of changing the diaper, which has good practicality and greatly improves the full use of the diaper.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A high-absorbency core, comprising: A contact surface layer, an absorption layer and a fixed bottom layer, wherein the absorption layer is located between the contact surface layer and the fixed bottom layer, characterized in that it also includes: An ion adsorption layer, the ion adsorption layer is arranged between the contact surface layer and the absorption layer; The ion adsorption layer comprises: a hydrophilic base layer, and cationic adsorption particles disposed on the hydrophilic base layer; The absorption layer comprises: an elastic absorption layer and a composite wood pulp layer; The hydrophilic base layer is used to accelerate the entry and passage of the liquid to be absorbed, as well as the attachment of the cationic adsorbent particles; The elastic absorption layer is provided with a flow guiding channel, the flow guiding channel is connected with the ion adsorption layer and the composite wood pulp layer and horizontally passes through both ends of the elastic absorption layer; The guide channel passes through the middle of the elastic absorption layer, and separates the elastic absorption layer into at least three independent three-dimensional absorption blocks; The three-dimensional absorption block comprises: a hollow wrapping bag, and water-absorbing particles filled in the wrapping bag; The three-dimensional absorption block is further provided with support wires, which are supported in the thickness direction of the three-dimensional absorption block and form a plurality of interconnected support spaces; the water-absorbing particles are located in the support spaces; A liquid-permeable color-changing layer is also provided between the elastic absorption layer and the composite wood pulp layer, and the liquid-permeable color-changing layer is connected to the guide channel; the liquid-permeable color-changing layer forms at least one exposed surface on the absorption layer; the liquid-permeable color-changing layer includes a reversible color-changing area located in the guide channel, so that it can be clearly observed from the outside through the guide channel whether liquid absorption is occurring; the liquid-permeable color-changing layer also includes an irreversible color-changing area located between the three-dimensional absorption block and the composite wood pulp layer.

2. A high-absorbency core according to claim 1, characterized in that: The thickness ratio of the elastic absorption layer to the composite wood pulp layer is 7:3 to 9:1, the thickness of the composite wood pulp layer is 0.3 mm to 1 mm, and the fixed bottom layer is made of a transparent material so that the exposed surface is exposed outside the high-absorption core.

3. A high-absorbency core according to any one of claims 1 to 2, characterized in that: Super absorbent fibers are distributed in the hydrophilic base layer.

4. A high-absorbency core according to any one of claims 1 to 2, characterized in that: The composite wood pulp layer comprises a wood pulp surface layer, a composite resin layer and a wood pulp bottom layer which are arranged in sequence. The composite resin layer is formed by compounding fluff pulp and high molecular water-absorbing resin.

5. A disposable sanitary product, characterized in that: A high-absorbency core comprising any one of claims 1 to 4.

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