Paper diaper core body structure and baby paper diaper

Abstract

The utility model relates to the technical field of baby products, in particular to a paper diaper core body structure and a baby paper diaper, the paper diaper core body structure comprises a first surface layer, a middle layer and a second surface layer which are sequentially arranged from top to bottom, the first surface layer is adhered to the upper surface of the middle layer, the second surface layer is adhered to the lower surface of the middle layer, and the second surface layer is adhered to the lower surface of the middle layer. The middle layer is a fluffy multi-gap material layer, and first water-absorbent resin is uniformly distributed in the fluffy multi-gap material layer. According to the paper diaper core structure and the baby paper diaper, the first water-absorbent resin is formed in the gaps of the fluffy multi-gap material layer, the problem that the formability is poor due to the fact that a traditional method only depends on bonding and fixing is solved, displacement or deformation of the water-absorbent resin in the using process is effectively prevented, and the stability and reliability of products are improved; the arrangement of the fluffy multi-gap material layer and the fluffy cotton layer can improve the air permeability and comfort of the core body structure, and is beneficial to the skin health of the baby.

Description

Technical Field

[0001] This utility model relates to the technical field of baby products, and more specifically, to a diaper core structure and a baby diaper. Background Technology

[0002] Disposable diapers are a common baby product, primarily functioning to absorb and hold urine. The core of a diaper is the absorbent core, typically composed of absorbent polymer (Absorbent Polymer) and non-woven fabric. The Absorbent Polymer absorbs urine, while the non-woven fabric provides support and disperses it. In existing diapers, the Absorbent Polymer is usually bonded to the surface of the core using hot melt adhesive. While this structure allows for adjustment of the Absorbent Polymer's shape, it presents several problems: First, hot melt adhesive alone cannot completely fix the Absorbent Polymer, preventing it from conforming well to the custom mold's shape. Second, relying solely on hot melt adhesive may lead to displacement or deformation of the Absorbent Polymer during use, affecting the diaper's absorbency and effectiveness, and potentially causing irritation to the baby's skin. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies where absorbent resin cannot conform to the shape of a customized mold and where absorbent resin shifts or deforms during use. This invention provides a diaper core structure and a baby diaper that effectively prevents absorbent resin from shifting or deforming during use, thereby improving the stability and reliability of the product.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A diaper core structure is provided, comprising a first surface layer, an intermediate layer, and a second surface layer arranged sequentially from top to bottom. The first surface layer is adhered to the upper surface of the intermediate layer, and the second surface layer is adhered to the lower surface of the intermediate layer. The intermediate layer is a fluffy, multi-gap material layer, and a first absorbent resin is uniformly distributed within the fluffy, multi-gap material layer.

[0006] The diaper core structure of this invention features a first absorbent resin formed within the gaps of a fluffy, multi-gap material layer. This solves the problem of poor formability caused by traditional methods that rely solely on adhesive bonding, effectively preventing the absorbent resin from shifting or deforming during use and improving the product's stability and reliability. Furthermore, the use of a fluffy, multi-gap material layer enhances the breathability and comfort of the core structure, making it more beneficial for the baby's skin health.

[0007] Furthermore, the fluffy, multi-gap material layer includes several soft, irregularly shaped first fiber supports. First gaps and second gaps are formed between the first fiber supports. The first absorbent resin fills the first gaps, and the second gaps are hollow. The soft, irregular shape of the first fiber supports allows for the positioning of the first absorbent resin. After absorbing urine, the first absorbent resin expands, and the fibers of the first fiber supports can be deformed by the first absorbent resin, ensuring that the first absorbent resin fully absorbs urine. The second gaps facilitate urine passage and improve the breathability and softness of the diaper, eliminating the need for additional liquid channels.

[0008] Furthermore, the porous, multi-gap material layer is a colored layer, and the first absorbent resin is a white resin, creating a color difference between the first absorbent resin and the porous, multi-gap material layer. This color difference between the white resin and the porous, multi-gap material layer makes the formation of the first absorbent resin clearer.

[0009] Furthermore, the fluffy, multi-gap material layer is selected from one of the following: hot-air nonwoven fabric layer, fluffy nonwoven fabric layer, and three-dimensional spaced knitted fabric layer. These materials offer superior breathability and comfort compared to traditional spunbond nonwoven fabrics, which is beneficial for protecting the baby's skin health. However, the selection of these materials is not a limitation of this invention.

[0010] Furthermore, a first hot melt adhesive layer is provided between the first surface layer and the upper surface of the intermediate layer, and a second hot melt adhesive layer is provided between the second surface layer and the lower surface of the intermediate layer. The arrangement of the first hot melt adhesive layer, the second hot melt adhesive layer, and the intermediate layer ensures that the first absorbent resin is stably fixed in the loose, porous material layer.

[0011] Furthermore, the width of the intermediate layer is equal to the width of the second surface layer, and the width of the first surface layer is greater than the width of the intermediate layer. The sides of the first surface layer wrap around the sides of the intermediate layer and the lower surface of the second surface layer. This size design allows the first surface layer to extend downwards to cover the sides of the intermediate layer and the lower surface of the second surface layer, giving the core structure a strong sense of integrity and facilitating subsequent core structure molding to obtain baby diapers.

[0012] Furthermore, it also includes a fluffy cotton layer, which is located between the first surface layer and the fluffy multi-gap material layer, and a second absorbent resin is uniformly distributed within the fluffy cotton layer. In addition to the first absorbent resin, a second absorbent resin is also provided, which can effectively improve the liquid absorption performance of the core structure. In this invention, the first and second absorbent resins can be the same type of absorbent resin or different types of absorbent resins.

[0013] Furthermore, the fluffy cotton layer includes several soft and irregularly shaped second fiber supports, with third and fourth gaps formed between them. The second absorbent resin fills the third gaps, and the fourth gaps are hollow. The soft and irregularly shaped second fiber supports can position the second absorbent resin. After absorbing urine, the second absorbent resin expands, and the fibers of the second fiber supports can be deformed by the second absorbent resin, allowing the second absorbent resin to fully absorb urine. The fourth gap facilitates urine passage and improves the breathability and softness of the diaper, eliminating the need for additional liquid channels.

[0014] Furthermore, the thickness of the fluffy cotton layer is less than the thickness of the intermediate layer, and the total amount of the first absorbent resin is greater than the total amount of the second absorbent resin. Preferably, the total amount of the first absorbent resin is 1.5 to 3 times the total amount of the second absorbent resin, so that the absorption rate of the intermediate layer is greater than that of the fluffy cotton, thereby forming a wetting gradient and enabling urine to flow unidirectionally from the fluffy cotton towards the intermediate layer, preventing urine from seeping back to the first surface layer, and thus improving the dryness of the diaper.

[0015] This utility model also provides a baby diaper, including a top layer, a distribution layer, a bottom film layer, and a diaper core structure as described above, wherein the top layer, the distribution layer, the diaper core structure, and the bottom film layer are arranged sequentially from top to bottom.

[0016] This invention relates to a baby diaper. The surface layer, in contact with the skin, primarily serves as a separator and allows liquid to pass through. A diversion layer, located between the surface layer and the core structure, assists in the rapid downward penetration of urine from the surface layer while guiding it to spread longitudinally along the diaper, ensuring even distribution and increasing the effective absorbent area of ​​the core structure. The bottom film layer, located at the very bottom, prevents leakage. In this invention, the first absorbent resin is formed within the gaps of a loose, multi-gap material layer, solving the problem of poor formability caused by traditional methods relying solely on adhesive bonding. This effectively prevents resin displacement or deformation during use, improving product stability and reliability. Furthermore, the use of a loose, multi-gap material layer enhances the breathability and comfort of the core structure, which is more beneficial for the baby's skin health.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The present invention relates to a diaper core structure and a baby diaper, wherein the first absorbent resin is formed in the gaps of a fluffy, multi-gap material layer, which solves the problem of poor formability caused by traditional methods that rely solely on adhesive fixation. This effectively prevents the absorbent resin from shifting or deforming during use, thereby improving the stability and reliability of the product.

[0019] The diaper core structure and baby diaper of this utility model, with its fluffy multi-gap material layer and fluffy cotton layer, can improve the breathability and comfort of the core structure, which is beneficial to the baby's skin health.

[0020] The diaper core structure and baby diaper of this utility model, by setting the amount of the first absorbent resin and the second absorbent resin, form an immersion gradient, so that urine can flow unidirectionally from the fluffy cotton towards the middle layer, avoiding urine back-seeping to the first surface layer, thereby improving the dryness of the diaper. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the diaper core structure in Example 1;

[0022] Figure 2 This is a schematic diagram of the middle layer of the diaper core structure in Example 1;

[0023] Figure 3 This is a schematic diagram of the first surface layer wrapping around the intermediate layer and the second surface layer in Embodiment 1;

[0024] Figure 4 This is a schematic diagram of the diaper core structure in Example 2;

[0025] Figure 5 This is a schematic diagram of the fluffy cotton layer in the diaper core structure of Example 2;

[0026] Figure 6 A schematic diagram of the structure of a baby diaper;

[0027] In the attached diagram: 100, core structure; 110, first surface layer; 120, intermediate layer; 121, first absorbent resin; 122, first fiber support; 123, first gap; 124, second gap; 130, second surface layer; 140, fluffy cotton layer; 141, second absorbent resin; 142, second fiber support; 143, third gap; 144, fourth gap; 200, surface layer; 300, flow guiding layer; 400, bottom film layer. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Example 1

[0031] This embodiment is a first embodiment of the diaper core structure 100, including a first surface layer 110, an intermediate layer 120, and a second surface layer 130 arranged sequentially from top to bottom. The first surface layer 110 is adhered to the upper surface of the intermediate layer 120, and the second surface layer 130 is adhered to the lower surface of the intermediate layer 120. The intermediate layer 120 is a fluffy, multi-gap material layer, and a first absorbent resin 121 is uniformly distributed within the fluffy, multi-gap material layer. Figure 1 As shown. In this embodiment, non-stick nonwoven fabric is used as the first surface layer 110 and the second surface layer 130 of the core structure 100, and a loose, multi-gap material layer is used as the intermediate layer 120. The upper and lower surfaces of the intermediate layer 120 are respectively bonded to the first surface layer 110 and the second surface layer 130 with hot melt adhesive. The use of the loose, multi-gap material layer does not increase the overall thickness of the core and can significantly improve the air permeability of the core structure 100. In order to achieve uniform distribution of the first absorbent resin 121, the first absorbent resin 121 in this embodiment can be sprayed through a nozzle with a certain pressure.

[0032] Specifically, the fluffy, multi-gap material layer includes a plurality of soft and irregularly shaped first fiber supports 122, with first gaps 123 and second gaps 124 formed between the first fiber supports 122. The first absorbent resin 121 fills the first gaps 123, and the second gaps 124 are hollow. Figure 2As shown. In this embodiment, the first fiber support 122 is soft and irregularly shaped, which can position the first absorbent resin 121. After absorbing urine, the first absorbent resin 121 expands, and the fibers of the first fiber support 122 can be squeezed and deformed by the first absorbent resin 121, so that the first absorbent resin 121 can fully absorb urine. The first gap 123 effectively fixes the first absorbent resin 121 and cooperates with the adhesive layer between the intermediate layer 120 and the first surface layer 110, and the adhesive layer between the intermediate layer 120 and the second surface layer 130, so that the molding of the first absorbent resin 121 is clearer and effectively prevents the first absorbent resin 121 from shifting or deforming during use. The second gap 124 facilitates the passage of urine without the need for additional liquid channels, which can improve the breathability and softness of the diaper. In addition, the second gap 124 can also provide space for the first absorbent resin 121 to expand after absorbing urine, and prevent the first absorbent resin 121 from blocking the flow of urine after absorbing liquid and expanding. The first gap 123 and the second gap 124 are provided at the same time, providing a liquid channel and a space for the first absorbent resin 121 to be contained, which increases the contact area between the first absorbent resin 121 and the urine, thereby improving the absorption effect and preventing the first absorbent resin 121 from accumulating.

[0033] The loose, multi-gap material layer is a colored layer, while the first absorbent resin 121 is white resin, creating a color difference between the first absorbent resin 121 and the loose, multi-gap material layer. This color difference makes the formation of the first absorbent resin 121 clearer and more prominent, enhancing the product's aesthetics. The loose, multi-gap material layer is selected from one of the following: a hot-air nonwoven fabric layer, a loose nonwoven fabric layer, or a three-dimensional spaced knitted fabric layer. These materials offer superior breathability and comfort compared to traditional spunbond nonwoven fabrics, which is beneficial for protecting infants' skin health. However, it should be noted that the loose, multi-gap material layer of this invention is not limited to hot-air nonwoven fabric layers, loose nonwoven fabric layers, or three-dimensional spaced knitted fabric layers. Other loose, multi-gap material layers with a first fiber support 122, a first gap 123, and a second gap 124 are also applicable to this invention.

[0034] In addition, a first hot melt adhesive layer is provided between the first surface layer 110 and the upper surface of the intermediate layer 120, and a second hot melt adhesive layer is provided between the second surface layer 130 and the lower surface of the intermediate layer 120. The arrangement of the first hot melt adhesive layer, the second hot melt adhesive layer, and the intermediate layer 120 allows the first absorbent resin 121 to be stably fixed in the fluffy, multi-gap material layer. In this embodiment, the width of the intermediate layer 120 is equal to the width of the second surface layer 130, and the width of the first surface layer 110 is greater than the width of the intermediate layer 120. The two sides of the first surface layer 110 wrap around the two sides of the intermediate layer 120 and the lower surface of the second surface layer 130. This size design allows the first surface layer 110 to extend downwards to cover the sides of the intermediate layer 120 and the lower surface of the second surface layer 130, giving the core structure 100 a strong sense of integrity and facilitating subsequent molding of the core structure 100 into a baby diaper, such as... Figure 3 As shown. Moreover, this wrapping design effectively prevents the absorbent resin from shifting or deforming during use, ensuring the diaper's absorbency and effectiveness, while also preventing discomfort to the baby's skin.

[0035] In this embodiment, a first hot melt adhesive layer is sprayed onto the upper surface of the intermediate layer 120, and the intermediate layer 120 and the first surface layer 110 are then laminated. Simultaneously, a second hot melt adhesive layer is sprayed onto the lower surface of the intermediate layer 120. Then, a first absorbent resin 121 is sprinkled into the fluffy, multi-gap material layer. The first absorbent resin 121 enters the first gaps 123 of the fluffy, multi-gap material layer without penetrating the first surface layer 110, thus fixing the first absorbent resin 121 within the fluffy, multi-gap material layer. Finally, the second surface layer 130 is laminated to the lower surface of the intermediate layer 120, resulting in the diaper core structure 100. In this embodiment, the diaper core structure 100, where the first absorbent resin 121 is formed within the gaps of the fluffy, multi-gap material layer, solves the problem of poor formability caused by traditional methods relying solely on adhesive bonding. This effectively prevents the absorbent resin from shifting or deforming during use, improving product stability and reliability. Furthermore, the use of the fluffy, multi-gap material layer enhances the breathability and comfort of the core structure 100, which is more beneficial to the baby's skin health.

[0036] Example 2

[0037] This embodiment is a second embodiment of the diaper core structure 100. This embodiment is similar to the first embodiment, except that it further includes a fluffy cotton layer 140. The fluffy cotton layer 140 is located between the first surface layer 110 and the fluffy multi-gap material layer. A second absorbent resin 141 is uniformly distributed within the fluffy cotton layer 140. Figure 4As shown. In addition to the first absorbent resin 121, a second absorbent resin 141 is also provided, which can effectively improve the liquid absorption performance of the core structure 100. In this utility model, the first absorbent resin 121 and the second absorbent resin 141 can be the same type of absorbent resin or different types of absorbent resin.

[0038] Similar to the structure of a fluffy, multi-gap material layer, the fluffy cotton layer 140 includes a plurality of soft and irregularly shaped second fiber supports 142, with third gaps 143 and fourth gaps 144 formed between the second fiber supports 142. The second absorbent resin 141 fills the third gaps 143, and the fourth gaps 144 are hollow. Figure 5 As shown. The second fiber support 142 is soft and irregularly shaped, which can position the second absorbent resin 141. After absorbing urine, the second absorbent resin 141 expands, and the fibers of the second fiber support 142 can be squeezed and deformed by the second absorbent resin 141, so that the second absorbent resin 141 can fully absorb urine. The third gap 143 effectively fixes the second absorbent resin 141 and cooperates with the adhesive layer between the middle layer 120 and the second surface layer 130, making the formation of the second absorbent resin 141 clearer and effectively preventing the second absorbent resin 141 from shifting or deforming during use. The fourth gap 144 allows urine to pass through without the need for additional liquid channels, which can improve the breathability and softness of the diaper. In addition, the second gap 144 can also provide space for the second absorbent resin 141 to expand after absorbing urine, preventing the second absorbent resin 141 from blocking the flow of urine after expanding. The third gap 143 and the fourth gap 144 are provided to provide a liquid channel and a space for the second absorbent resin 141, thereby increasing the contact area between the second absorbent resin 141 and urine, improving the absorption effect, and preventing the second absorbent resin 141 from accumulating.

[0039] In this embodiment, the fluffy cotton layer 140 is a colored layer, and the second absorbent resin 141 is a white resin, creating a color difference between the second absorbent resin 141 and the fluffy cotton layer 140. This color difference between the white resin and the fluffy cotton layer 140 makes the formation of the second absorbent resin 141 clearer. The fluffy cotton layer 140 is selected from one of the following: a hot-air nonwoven fabric layer, a fluffy nonwoven fabric layer, and a three-dimensional spaced knitted fabric layer. These materials offer superior breathability and comfort compared to traditional spunbond nonwoven fabrics, which is beneficial for protecting the baby's skin health. However, the selection of these materials is not a limitation of this invention.

[0040] In addition, in this embodiment, the thickness of the fluffy cotton layer 140 is less than the thickness of the intermediate layer 120, and the total number of the first absorbent resin 121 is greater than the total number of the second absorbent resin 141. Preferably, in this embodiment, the total number of the first absorbent resin 121 is 1.5 to 3 times the total number of the second absorbent resin 141. With this configuration, the absorption rate of the intermediate layer 120 is greater than that of the fluffy cotton, thereby forming a wetting gradient and enabling urine to flow unidirectionally from the fluffy cotton towards the intermediate layer 120, preventing urine from seeping back to the first surface layer 110, and thus improving the dryness of the diaper.

[0041] Regarding the fluffy cotton layer 140 and the fluffy multi-gap material layer, the following should be noted in this embodiment:

[0042] The fluffy cotton layer 140 and the fluffy multi-gap material layer can be the same material layer, together forming the intermediate layer 120; the boundary is only defined by the thickness of the intermediate layer 120, such as the upper third of the thickness of the intermediate layer 120 being the fluffy cotton layer 140, and the lower two-thirds of the thickness of the intermediate layer 120 being the fluffy multi-gap material layer. The second absorbent resin 141 can be sprayed from the upper surface of the fluffy cotton layer 140, and the first absorbent resin 121 can be sprayed from the lower surface of the fluffy multi-gap material layer. The distribution quantity and distribution range of the first absorbent resin 121 and the second absorbent resin 141 can be controlled by controlling the spraying amount and spraying pressure of the first absorbent resin 121 and the second absorbent resin 141.

[0043] The fluffy cotton layer 140 and the fluffy multi-gap material layer can be two different material layers. After the second absorbent resin 141 is sprinkled into the fluffy cotton layer 140, the fluffy cotton layer 140 and the fluffy multi-gap material layer are combined. Then, the first absorbent resin 121 is sprinkled into the fluffy multi-gap material layer, or the first absorbent resin 121 is sprinkled into the fluffy multi-gap material layer and then the fluffy cotton layer 140 and the fluffy multi-gap material layer are combined. Sprinkling different absorbent resins into different material layers makes it easier to control the distribution quantity and distribution range of the first absorbent resin 121 and the second absorbent resin 141.

[0044] The specific implementation steps of this embodiment are similar to those of Embodiment 1, as follows:

[0045] The upper surface of the fluffy cotton layer 140 is laminated with the first surface layer 110. A second absorbent resin 141 is sprinkled into the fluffy cotton layer 140. The second absorbent resin 141 enters the third gap 143 of the fluffy cotton layer 140 without penetrating the first surface layer 110. The second absorbent resin 141 is fixed in the third gap 143 of the fluffy cotton layer 140. The fluffy multi-gap material layer is laminated with the fluffy cotton layer 140. Then, a first absorbent resin 121 is sprinkled into the fluffy multi-gap material layer. The first absorbent resin 121 enters the first gap 123 of the fluffy multi-gap material layer without penetrating the upper surface layer of the fluffy multi-gap material layer. The first absorbent resin 121 is fixed in the first gap 123 of the fluffy multi-gap material layer. The second surface layer 130 is laminated with the lower surface of the intermediate layer 120 to obtain the diaper core structure 100. It should be noted that the above implementation steps are only examples. In actual processing, the molding method can be adjusted according to the specific working environment and the specific diaper core structure 100.

[0046] In this embodiment, the diaper core structure 100 incorporates a first absorbent resin 121 formed within the gaps of a fluffy, multi-gap material layer. This solves the problem of poor formability caused by traditional methods relying solely on adhesive bonding, effectively preventing resin displacement or deformation during use and improving product stability and reliability. The use of a fluffy, multi-gap material layer enhances the breathability and comfort of the core structure 100, which is more beneficial for infant skin health. Furthermore, in this embodiment, in addition to the first absorbent resin 121, a second absorbent resin 141 is also provided, which effectively improves the liquid absorption performance of the core structure 100. The total number of the first absorbent resin 121 is greater than the total number of the second absorbent resin 141, and the absorption rate of the intermediate layer 120 is greater than that of the fluffy cotton, thus forming a wetting gradient. This allows urine to flow unidirectionally from the fluffy cotton towards the intermediate layer 120, preventing urine backflow to the first surface layer 110 and thereby improving the diaper's dryness.

[0047] Example 3

[0048] This embodiment is an example of a baby diaper, including a top layer 200, a distribution layer 300, a bottom film layer 400, and a diaper core structure 100 as described in Embodiment 1 or Embodiment 2. The top layer 200, the distribution layer 300, the diaper core structure 100, and the bottom film layer 400 are arranged sequentially from top to bottom. Figure 6 As shown.

[0049] In this embodiment of the baby diaper, the surface layer 200, which contacts the skin, is made of ES thermally rolled or hot-air nonwoven material and mainly serves to separate and allow liquid to pass through. The diversion layer 300 is located between the surface layer 200 and the core structure 100 and is mainly made of hot-air nonwoven material made of ES fiber or thermoplastic fiber. It can help urine quickly penetrate downward from the surface layer 200 of the diaper while guiding the urine to spread longitudinally along the diaper, so that the urine is evenly spread in the diaper, thereby increasing the effective liquid absorption area of ​​the core structure 100. The bottom film layer 400 is located at the bottom of the diaper and is mainly made of thermally rolled nonwoven material PE composite bottom film or PP breathable microporous film, which serves to prevent leakage.

[0050] When the diaper core structure 100 of Embodiment 1 is used, the baby diaper of this embodiment solves the problem of poor moldability caused by the traditional method of relying solely on adhesive fixation, effectively preventing the displacement or deformation of the absorbent resin during use, and improving the stability and reliability of the product; in addition, the use of a fluffy, multi-gap material layer can improve the breathability and comfort of the core structure 100, which is more beneficial to the baby's skin health.

[0051] When the diaper core structure 100 of Embodiment 2 is used, the baby diaper of this embodiment also has the following advantages: In addition to the first absorbent resin 121, a second absorbent resin 141 is also provided, which can effectively improve the liquid absorption performance of the core structure 100; the total number of the first absorbent resin 121 is greater than the total number of the second absorbent resin 141, and the absorption speed of the middle layer 120 is greater than the absorption speed of the fluffy cotton, thereby forming an immersion gradient, realizing that urine flows unidirectionally from the fluffy cotton to the middle layer 120, avoiding urine back-seeping to the first surface layer 110, thereby improving the dryness of the baby diaper.

[0052] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A paper diaper core structure (100) characterized by, The material includes a first surface layer (110), an intermediate layer (120), and a second surface layer (130) arranged sequentially from top to bottom. The first surface layer (110) is bonded to the upper surface of the intermediate layer (120), and the second surface layer (130) is bonded to the lower surface of the intermediate layer (120). The intermediate layer (120) is a loose, porous material layer, and a first absorbent resin (121) is uniformly distributed within the loose, porous material layer.

2. The paper diaper core structure (100) according to claim 1, characterized in that, The fluffy, multi-gap material layer includes several soft and irregularly shaped first fiber supports (122), with a first gap (123) and a second gap (124) formed between the first fiber supports (122). The first absorbent resin (121) fills the first gap (123), and the second gap (124) is hollow.

3. The paper diaper core structure (100) according to claim 1, characterized in that, The fluffy, multi-gap material layer is a colored layer, and the first absorbent resin (121) is a white resin. There is a color difference between the first absorbent resin (121) and the fluffy, multi-gap material layer.

4. The paper diaper core structure (100) according to claim 1, characterized in that, The loose, multi-gap material layer is selected from one of the following: hot-air nonwoven fabric layer, loose nonwoven fabric layer, and three-dimensional spaced knitted fabric layer.

5. The paper diaper core structure (100) according to claim 1, characterized in that, A first hot melt adhesive layer is provided between the first surface layer (110) and the upper surface of the intermediate layer (120), and a second hot melt adhesive layer is provided between the second surface layer (130) and the lower surface of the intermediate layer (120).

6. The paper diaper core structure (100) according to claim 1, characterized in that, The width of the intermediate layer (120) is equal to the width of the second surface layer (130), the width of the first surface layer (110) is greater than the width of the intermediate layer (120), and the two sides of the first surface layer (110) wrap around the two sides of the intermediate layer (120) and the lower surface of the second surface layer (130).

7. The paper diaper core structure (100) according to any one of claims 1 to 6, characterized in that, It also includes a fluffy cotton layer (140), which is located between the first surface layer (110) and the fluffy multi-gap material layer, and a second absorbent resin (141) is uniformly distributed in the fluffy cotton layer (140).

8. The paper diaper core structure (100) according to claim 7, characterized in that, The fluffy cotton layer (140) includes a plurality of soft and irregularly shaped second fiber supports (142), with a third gap (143) and a fourth gap (144) formed between the second fiber supports (142), the second absorbent resin (141) filling the third gap (143), and the fourth gap (144) being hollow.

9. The paper diaper core structure (100) according to claim 7, characterized in that, The thickness of the fluffy cotton layer (140) is less than the thickness of the intermediate layer (120), and the total amount of the first absorbent resin (121) is greater than the total amount of the second absorbent resin (141).

10. An infant's paper diaper, characterized by, The diaper includes a top layer (200), a flow-guiding layer (300), a bottom film layer (400), and a diaper core structure (100) as described in any one of claims 1 to 9, wherein the top layer (200), the flow-guiding layer (300), the diaper core structure (100), and the bottom film layer (400) are arranged sequentially from top to bottom.

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