Core structure
By introducing a closed structure into the diaper core, the deformation and extrusion problems of the core when folded are solved, the absorption amount and diffusion effect are improved, and better absorption performance is achieved.
Patent Information
- Application Number
- CN202421554431.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The existing diaper core structure is likely to cause local deformation, distortion or thinness when folded, and low absorption, resulting in faults and lumps.
A core structure design adopts a closed structure, where the thickness of the closed structure is smaller than that of the intermediate composite layer. The closed structure and the intermediate composite layer are wrapped by the upper and lower cores, fixed their position, and form a recessed structure when folded to avoid extrusion and enhance the absorption effect.
It effectively avoids deformation and extrusion of the core when folding, increases the absorption amount, reduces faults and lumps, and increases the absorption speed and diffusion length of the core.
Smart Images
Figure CN223126762U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of absorbent articles, in particular to a core structure. Background Art
[0002] At present, there are two types of core structures for diaper products on the market. One is the traditional core with a mixed structure of wood pulp fluff pulp and superabsorbent polymer; the other is the existing composite core with a structure of about five layers, namely the core surface layer + superabsorbent polymer + intermediate fluffy non-woven fabric + superabsorbent polymer + core bottom layer.
[0003] Since diaper products usually need to be folded for storage during actual use, folding will cause local extrusion, resulting in deformation, distortion or thinning of the materials in the folded parts of the above two structures, leading to low absorbency of the core and the appearance of faults and lumping in local areas.
[0004] In view of this, the present utility model is specifically proposed. Summary of the Utility Model
[0005] One of the purposes of the present utility model is to provide a core structure to solve the technical problems in the prior art that folding of the core structure will cause local extrusion, resulting in deformation, distortion or thinning, leading to low absorbency of the core and the appearance of faults and lumping in local areas.
[0006] To achieve the above object of the present utility model, the following technical solutions are specifically adopted:
[0007] The present utility model provides a core structure, including an upper core, a lower core, a plurality of closed structures arranged between the upper core and the lower core, and an intermediate composite layer arranged between the plurality of closed structures;
[0008] The plurality of closed structures are respectively located at the folding positions of the core;
[0009] The thickness of the closed structure is less than the thickness of the intermediate composite layer.
[0010] Further, the width of the closed structure ≥ 2 times the thickness of the intermediate composite layer.
[0011] Further, the width of the closed structure is 2 - 20 mm.
[0012] Further, the shape formed by the closed structure extending along the folding position of the core is linear.
[0013] Further, the shape formed by the closed structure extending along the folding position of the core is S-shaped or arc-shaped.
[0014] Further, the extending direction of the closed structure at the folding position of the core is continuously arranged.
[0015] Further, the extending direction of the closing structure at the folding position of the core body is intermittently arranged.
[0016] Further, the upper core body and the lower core body are respectively and independently one or a combination of two or more of hydroentangled non-woven fabric, hot air non-woven fabric or spunbond non-woven fabric.
[0017] Further, the intermediate composite layer includes a polymer mixed layer and wood pulp fluff disposed within the polymer mixed layer.
[0018] Further, the polymer mixed layer is sodium polyacrylate.
[0019] A core body structure provided by the present utility model wraps the closing structure and the intermediate composite layer by the upper core body and the lower core body, fixing the relative positions of the closing structure and the intermediate composite layer; through a plurality of closing structures, the intermediate composite layer therebetween will not be deformed or displaced due to the folding at the closing structure. At the same time, since the thickness of the closing structure is less than the thickness of the intermediate composite layer, a downwardly concave structure is formed at the closing structure, providing space for the approaching of the core bodies on both sides during folding, avoiding extrusion of the intermediate composite layer in the core bodies on both sides, and the concave structure also has a drainage function in the unfolded state. It solves the technical problems in the prior art that the folding of the core body structure will cause local extrusion, resulting in deformation, distortion or thinning, leading to low absorption capacity of the core body, and local faults and lumping. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 Schematic diagram of the unfolded state of the core body structure provided in Embodiment 1 of the present utility model;
[0022] Figure 2 Schematic diagram of the folded state of the core body structure provided in Embodiment 1 of the present utility model.
[0023] Reference numerals: 1 - upper core body;
[0024] 2 - lower core body;
[0025] 3 - closing structure;
[0026] 4 - intermediate composite layer; 41 - polymer mixed layer; 42 - wood pulp fluff. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] Unless otherwise defined herein, scientific and technical terms used in connection with the present utility model shall have the meanings commonly understood by those of ordinary skill in the art. The meanings and scopes of the terms shall be clear. However, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or extrinsic definition. In this application, unless otherwise specified, the use of "or" means "and / or". In addition, the use of the term "comprising" and other forms is non-restrictive.
[0028] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "proximal end", "distal end", "front end", "rear end", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.
[0030] Terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.
[0031] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0032] The present utility model provides a core structure, which includes an upper core 1, a lower core 2, a plurality of closed structures 3 arranged between the upper core 1 and the lower core 2, and an intermediate composite layer 4 arranged between the plurality of closed structures 3;
[0033] The plurality of closed structures 3 are respectively located at the folding positions of the core;
[0034] The thickness of the closed structure 3 is less than the thickness of the intermediate composite layer 4.
[0035] The upper core body 1 and the lower core body 2 wrap the closed structure 3 and the intermediate composite layer 4 therein to fix the relative positions of the closed structure 3 and the intermediate composite layer 4; through a plurality of closed structures 3, the intermediate composite layer 4 therebetween will not be deformed or displaced due to the folding at the closed structure 3. At the same time, since the thickness of the closed structure 3 is smaller than the thickness of the intermediate composite layer 4, a downwardly concave structure is formed at the closed structure 3, providing space for the approach of the core bodies on both sides during folding, avoiding extrusion of the intermediate composite layer 4 in the core bodies on both sides, and the concave structure also has a drainage effect in the unfolded state. This solves the technical problems in the prior art that the folding of the core body structure will cause extrusion to a local area, resulting in deformation, distortion or thinning, leading to low absorption capacity of the core body and the appearance of faults and lumps locally.
[0036] In order to better achieve the folding of the core body structure and avoid affecting the folding effect and causing extrusion to the core body due to the narrow width of the closed structure 3, which cannot provide sufficient folding space for the intermediate composite layer 4 on the adjacent sides after folding.
[0037] In some specific embodiments, the width of the closed structure 3 ≥ 2 times the thickness of the intermediate composite layer 4.
[0038] In some specific embodiments, the width of the closed structure 3 is 2 - 20 mm.
[0039] Among them, the width of the closed structure 3 can be, but is not limited to, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, or any value between 2 - 20 mm.
[0040] In some specific embodiments, the shape formed by the closed structure 3 extending along the folding position of the core body is linear.
[0041] In order to further improve the use effect of the closed structure and improve its softness, in some specific embodiments, the shape formed by the closed structure 3 extending along the folding position of the core body is S-shaped or arc-shaped.
[0042] Specifically, along the extending direction of the folding position, the closed structure is linear, S-shaped or arc-shaped. Different shapes have different softness degrees formed at the folding position due to different pressing point areas. Among them, the S-shaped has the best softness. At the same time, different-shaped closed structures are helpful for the backflow and diffusion of liquid.
[0043] In order to further improve the folding effect at the folding position, in some specific embodiments, the closed structure 3 is continuously arranged along the extending direction of the folding position of the core body.
[0044] In some specific embodiments, the extending direction of the closing structure 3 at the core folding position is intermittently arranged.
[0045] The intermittent arrangement can reduce the positions of pressing or adhesive bonding, improving the feel of the core. It reduces the amount of glue used, the pressing positions, power consumption, energy consumption and carbon emissions.
[0046] In some specific embodiments, an intermediate composite layer 4 is arranged at the intermittent position.
[0047] In some specific embodiments, the upper core body 1 and the lower core body 2 are respectively and independently one or more combinations of spunlace non-woven fabric, hot air non-woven fabric or spunbond non-woven fabric.
[0048] In some specific embodiments, the intermediate composite layer 4 includes a polymer mixing layer 41 and wood pulp fluff 42 arranged in the polymer mixing layer 41.
[0049] Among them, the polymer mixing layer 41 is specifically sodium polyacrylate. It can be selected, for example, the mixture of Sumitomo 60S and BASF 7059, or other combinations.
[0050] In order to further improve the liquid absorption effect of the intermediate composite layer 4.
[0051] In some specific embodiments, the mass ratio of the wood pulp fluff 42 to the polymer mixing layer 41 is 1:1 to 1.5.
[0052] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0053] Example 1
[0054] Combined Figures 1 to 2 For illustration, a core structure includes an upper core body 1, a lower core body 2, a plurality of closing structures 3 arranged between the upper core body 1 and the lower core body 2, and an intermediate composite layer 4 arranged between the plurality of closing structures 3. The plurality of closing structures are respectively located at the core folding positions.
[0055] Among them, the width of the closing structure 3 is 4 mm; the thickness of the intermediate composite layer 4 is 2 mm, and the width is 20 - 25 mm.
[0056] The shape formed by the closing structure 3 extending along the core folding position is linear, and the extending direction at the core folding position is continuously arranged.
[0057] The upper core body 1 and the lower core body 2 are respectively made of spunlace non-woven fabric. The middle composite layer 4 includes a polymer mixed layer 41 and wood pulp fluff 42 disposed within the polymer mixed layer 41. The polymer mixed layer 41 is a mixture of Sumitomo 60S and BASF 7059. The mass ratio of the wood pulp fluff 42 to the polymer mixed layer 41 is 1:1.
[0058] Comparative Example 1
[0059] Different from Example 1, there is no closing structure 3. Specifically, it includes an upper core body 1, a lower core body 2, and a middle composite layer 4 disposed between the upper core body 1 and the lower core body 2.
[0060] The absorption speed of the core structure of Example 1 and Comparative Example 1 was tested using the same testing method of the new national standard for diapers (GB-T 28004.1-2021 Diapers Part 1: Baby Diapers). The specific results show that:
[0061] The first absorption speed of Example 1 was 25 seconds, the second absorption speed was 40 seconds, the rewet amount was 0.3 g, and the diffusion length was 280 mm.
[0062] The first absorption speed of Comparative Example 1 was 28 seconds, the second absorption speed was 50 seconds, the rewet amount was 1.3 g, and the diffusion length was 260 mm.
[0063] Based on the above results, it can be seen that compared with the comparative example, the core structure of Example 1 speeds up the absorption speed, accelerates the urine diffusion, and improves the dryness effect.
[0064] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A core structure, characterized in that, It includes an upper core body (1), a lower core body (2), a plurality of closed structures (3) disposed between the upper core body (1) and the lower core body (2), and an intermediate composite layer (4) disposed between the plurality of closed structures (3); The plurality of closed structures (3) are respectively located at the folding positions of the core body; The thickness of the closed structure (3) is less than the thickness of the intermediate composite layer (4).
2. The core structure according to claim 1, characterized in that, The width of the closed structure (3) ≥ 2 times the thickness of the intermediate composite layer (4).
3. The core structure according to claim 2, characterized in that, The width of the closed structure (3) is 2 - 20 mm.
4. The core structure according to claim 1, wherein The shape formed by the closed structure (3) extending along the folding position of the core body is linear.
5. The core structure according to claim 1, characterized in that, The shape formed by the closed structure (3) extending along the folding position of the core body is S-shaped or arc-shaped.
6. The core structure according to any one of claims 1 to 5, characterized in that, The extending direction of the closed structure (3) at the folding position of the core body is continuously arranged.
7. The core structure according to any one of claims 1 to 5, characterized in that The extending direction of the closed structure (3) at the folding position of the core body is intermittently arranged.
8. The core structure according to claim 1, characterized in that, The upper core body (1) and the lower core body (2) are respectively independently one or a combination of two or more of spunlace non-woven fabric, hot air non-woven fabric or spunbond non-woven fabric.
9. The core structure according to claim 1, characterized in that, The intermediate composite layer (4) includes a polymer mixed layer (41) and wood pulp fluff (42) disposed in the polymer mixed layer (41).
10. The core structure according to claim 9, characterized in that, The polymer mixed layer (41) is sodium polyacrylate.