Foamed cotton composite core structure

Abstract

The utility model relates to sanitary article technical field especially, more particularly to a kind of foam cotton composite core structure, from top to bottom sequentially include surface non-woven fabric, PU foam cotton layer and absorbent core, the absorbent core includes lower water absorption layer and second high molecular absorbent resin applied on lower water absorption layer, surface non-woven fabric and absorbent core between place PU foam cotton layer promote the softness of core body, compared with existing core body, it is more light, experience is better, SAP is embedded in absorbent core, without wrapping SAP also can not scatter, water-absorbing resin has certain weight and is applied on certain density fluff pulp, when contact with skin, it is thick and hard stiff, and comfort is low.

Description

Technical Field

[0001] This utility model relates to the field of hygiene products technology, and in particular to a foamed cotton composite core structure. Background Technology

[0002] Currently, Chinese patent application number CN201810304751.0 discloses a breathable sanitary napkin core, which includes an intermediate absorbent layer. The absorbent layer is wrapped with toilet paper on the outside. Several breathable lines are arranged in parallel in the middle of the core. Each breathable line is composed of several spaced breathable units. The total length of all breathable units in each breathable line accounts for 80%-95% of the total length of the core. Each breathable unit penetrates through the thickness direction of the core. This discloses a conventional sanitary napkin structure. The conventional absorbent core structure is usually composed of non-woven fabric, absorbent resin, and fluff pulp. In actual use, in order to ensure a certain absorption capacity, the absorbent resin has a certain weight and is applied on fluff pulp of a certain density. When in contact with the skin, it is thick and stiff, resulting in low comfort. Summary of the Invention

[0003] Therefore, in view of the above problems, this utility model proposes a foamed cotton composite core structure, which solves the above problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a foamed cotton composite core structure, comprising, from top to bottom, a surface non-woven fabric, a PU foamed cotton layer, and an absorbent core, wherein the absorbent core includes a lower absorbent layer and a second polymer absorbent resin applied to the lower absorbent layer.

[0005] Furthermore, the weight of the PU foam layer is 30-80% of the absorbent core, the thickness of the PU foam layer is 1-4mm, and the PU foam layer has a pore size of 15PPI-90PPI.

[0006] Furthermore, the surface nonwoven fabric is a spunlace nonwoven fabric, and the surface of the surface nonwoven fabric has multiple openings.

[0007] Furthermore, it also includes a first polymer absorbent resin disposed between the surface nonwoven fabric and the PU foam layer.

[0008] Furthermore, a fluffy filling layer is provided on the PU foam layer, and the first polymer absorbent resin is applied on the fluffy filling layer. The weight of the fluffy filling layer and the first polymer absorbent resin is 30-80% of the absorbent core.

[0009] Furthermore, the PU foam layer has multiple central holes.

[0010] By adopting the aforementioned technical solution, the beneficial effects of this utility model are: This foam composite core structure features a PU foam layer, which has good elasticity. The PU foam layer placed between the surface non-woven fabric and the absorbent core enhances the softness of the core, making it lighter and providing a better user experience compared to existing cores. The SAP is embedded in the absorbent core and will not fall out without needing to be wrapped. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the production device mechanism according to Embodiment 1 of this utility model. Figure 3 This is a schematic cross-sectional view of the PU foam layer structure in Embodiment 2 of this utility model; The labels in the diagram are: 1. Surface non-woven fabric; 2. PU foam layer; 3. Absorbent core; 301. Lower absorbent layer; 302. Upper absorbent paper; 4. Fluffy filling layer; 101. Opening. Detailed Implementation

[0012] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0013] refer to Figure 1 This embodiment provides a foamed cotton composite core structure, which, from top to bottom, includes a surface nonwoven fabric 1, a fluffy filling layer 4, a first polymer absorbent resin disposed between the surface nonwoven fabric 1 and the fluffy filling layer 4, a PU foamed cotton layer 2, and an absorbent core 3. The absorbent core 3 includes a lower absorbent layer 301 and a second polymer absorbent resin applied to the lower absorbent layer 301; the second polymer absorbent resin in the accompanying drawings is represented by circular shaded particles on the lower absorbent layer 301; the placement of the PU foamed cotton layer 2 between the surface nonwoven fabric 1 and the absorbent core 3 enhances the softness of the core, compared to existing... The core is lighter and provides a better user experience. The surface nonwoven fabric 1 is preferably wood pulp spunlace nonwoven fabric. When used in combination with PU foam layer 2, it has good air permeability. The wood pulp spunlace nonwoven fabric quickly guides liquid, which permeates downward through PU foam layer 2 and is quickly absorbed by the absorbent core 3. Since there is PU foam layer 2 between the surface nonwoven fabric 1 and the absorbent core 3, the back-seepage of liquid from the absorbent core 3 to the surface nonwoven fabric can be reduced. Multiple openings 101 can be added to the surface of the surface nonwoven fabric 1 to increase water permeability. The surface nonwoven fabric 1 can also be replaced with hot air nonwoven fabric or other existing nonwoven fabrics.

[0014] The weight of the PU foam layer 2 is 30-80% of that of the absorbent core 3. The thickness of the PU foam layer 2 is 1-4mm. The amount of PU foam layer 2 used per square meter is 40-80g / ㎡. The optimal thickness range is 1.5-1.7mm. The width of the amount used per square meter is 1000-1200mm. Under these conditions, the PU foam layer 2 maintains good elasticity, is lightweight and soft. The PU foam layer 2 has a PPI value of 15~90, with the best being 40±15 PPI. PPI refers to the number of pores per inch. Simply put, it measures the number of air holes, or pores, in the foam material per inch of length. This PPI value provides the best air permeability and fast liquid penetration, while also taking into account elasticity and softness. The PU foam layer 2 makes the material lighter. The PU foam layer 2 is elastic, softer and more comfortable, improving the user experience. The preferred dosage per square meter is 60g of PU foam layer 2 and 30g of perforated wood pulp spunlace nonwoven fabric. The weight of each material can be adjusted according to the actual sanitary products used. This structure can achieve quick absorption and dryness while reducing the weight per square meter, making the composite core structure light, soft and elastic, providing a better user experience.

[0015] The lower absorbent layer 301 inside the absorbent core 3 is preferably absorbent paper, which provides the best thinness. It can also be replaced with fluff pulp or other existing materials. Replacing it with other materials will affect the thinness and comfort. Especially when used in conjunction with the surface non-woven fabric 1, the PU foam layer 2, and the first polymer absorbent resin and fluffy filling layer between the surface non-woven fabric 1 and the PU foam layer 2, the second polymer absorbent resin performs preliminary absorption or absorbs together with the fluffy filling layer 4. The PU foam layer 2 is located above the lower absorbent layer 301 and the second polymer absorbent resin. The absorbent paper and the second polymer absorbent resin absorb less of the seeping liquid. The absorbent paper and the second polymer absorbent resin can achieve sufficient water-locking and dispersion absorption.

[0016] The absorbent core 3 also includes an upper absorbent paper 302 for laminating the lower absorbent layer 301. After the absorbent core is laminated with the PU foam layer, the second polymer absorbent resin is embedded in the absorbent core 3. The second polymer absorbent resin will not fall apart without needing to be wrapped. The lower absorbent layer 301 is preferably absorbent paper. The absorbent core 3, in conjunction with absorbent paper, replaces the traditional expanded paper layer, which can significantly reduce dust problems and is thinner. It can also be replaced with other existing non-woven fabrics. When it is absorbent paper, it is the best choice. The absorbent paper for the upper and lower absorbent layers can be referred to in the applicant's Chinese patent number: CN118581759A.

[0017] The PU foam layer 2 has a fluffy filling layer 4. The first polymer absorbent resin is applied to the fluffy filling layer 4. The weight of the fluffy filling layer 4 and the first polymer absorbent resin is 30-80% of the absorbent core 3. The fluffy filling layer 4 and the first polymer absorbent resin are light in weight and thin in thickness, and are located between the surface non-woven fabric and the PU foam layer, making them softer to the skin during use. When the PU foam layer 2 is used directly as the surface layer or directly combined with the surface nonwoven fabric 1, the seepage rate of the PU foam layer 2 is slower than that of existing nonwoven fabrics. A small amount of first polymer absorbent resin can be added to the PU foam layer 2 to initially and quickly absorb some of the liquid seeping from the surface nonwoven fabric 1. Simultaneously, some liquid permeates downwards through the PU foam layer 2, reducing the time the liquid remains on the surface of the PU foam layer 2 and avoiding the negative impact of its slow seepage rate. The dispersion of the first polymer absorbent resin can be achieved by applying a fluffy filler layer 4. When used in conjunction with the first polymer absorbent resin, the surface nonwoven fabric 1 and the PU foam layer 2 are dispersed. The weight and thickness of the first polymer absorbent resin and the fluffy filler layer 4 are both less than those of the absorbent core 3 below. Compared with the PU foam layer 2 with only the first polymer absorbent resin added, it has better absorption of liquid that has not seeped down to the top of the PU foam layer 2. After the liquid that seeps down to the bottom of the PU foam layer 2 is absorbed by the absorbent core 3, the backflow of liquid into the absorbent core 3 can be reduced due to the interlayer of the PU foam layer 2. The fluffy filler layer 4 can be fluff pulp, hot air nonwoven fabric or other existing materials. The fluffy filler layer 4 is preferably hot air nonwoven fabric, which can be selected according to actual usage requirements. The first polymer absorbent resin in the attached drawings of the instruction manual is the circular shaded particles on the fluffy filler layer 4.

[0018] The amount of material used per square meter (g / ㎡) from top to bottom includes 30g of surface nonwoven fabric, 20g of polymer absorbent resin, 20g of fluffy cotton, 60g of PU foam layer, and 85g of absorbent core, to test the rewetting performance of the sample.

[0019] ordinary samples 20-30 2.0 foam core 15-18 1.5 refer to Figure 3In this embodiment, the PU foam layer has multiple central holes 2a with a diameter of 0.5mm to 10mm on its surface, which can improve the seepage rate of liquid on the PU foam layer. The PU foam layer has perforations 20d that gradually narrow from the center on both sides of the lateral direction. The PU foam layer has a recessed portion 20b at the top of the central hole and a convex portion 20c at the bottom of the central hole. The specific manufacturing process is as follows: After the PU foam layer is fed in, it is perforated; the PU foam layer passes through the PU foam layer via an external convex roller, and the external piercing roller punctures the PU foam layer on both sides of the lateral direction to form perforations 20d that gradually narrow from the sides to the center. Simultaneously, it is subjected to external... The convex roller is perforated under pressure, forming a concave portion 20b around the central hole. Simultaneously, a convex portion 20c is formed on the bottom surface of the PU foam layer near the central hole. Liquid on the top surface of the PU foam layer will penetrate downwards more quickly. The concave portion on the bottom surface will contact the absorbent core, forming a certain gap, reducing backflow of the absorbent core through the central hole. After the liquid penetrates to the middle of the PU foam layer, the perforation gradually narrows from both sides to the middle, and the liquid in the middle is guided to both sides through the perforation. At the same time, some liquid seeps downwards. In actual use, the middle position of the PU foam layer receives more liquid, and the perforation accelerates the downward penetration speed of the liquid in the middle position of the PU foam layer, further improving the user experience.

[0020] The fluffy filler layer 4 has spaced-apart recesses 40e, and the first polymer absorbent resin is disposed at the recesses 40e on the fluffy filler layer 4. The recesses 40e are adjacent to each other to form a flow guiding space. The fluffy filler layer 4 is divided into a left side region 40a, a middle region 40b, and a right side region 40c along its width. The first polymer absorbent resin located in the middle region 40b of the fluffy filler layer accounts for 60-70% of the weight, while the first polymer absorbent resin located in the left side region 40a and the right side region 40c accounts for 30-40% of the weight. The diameter of the central hole in the middle zone 40b of the fluffy filler layer is larger than that in the left side zone 40a and the right side zone 40c. The width of the flow guiding space in the middle zone 40b of the fluffy filler layer is also larger than that in the left side zone 40a and the right side zone 40c. During use, the liquid absorption capacity in the middle zone is greater. To improve the flow guiding performance, the larger flow guiding space in the middle zone 40b will improve the liquid flow guiding performance. In addition, some liquid can penetrate downward through the PU foam layer, reducing the liquid residence time in the PU foam layer and improving the downward penetration performance of the liquid on the surface of the PU foam layer. Since the liquid absorption demand of the left and right side zones is small, the weight of the first polymer absorbent resin is lighter. The concave part on the fluffy filler layer is formed by roller pressing. The first polymer absorbent resin is embedded in the concave part position, making it less likely to disperse. The first polymer absorbent resin will expand to both sides. Due to the interval, the thickness of the upward bulge after expansion is reduced, which will comprehensively improve the comfort performance during use.

[0021] The production equipment for this foam composite core structure can be referenced. Figure 2 The assembly includes a frame, multiple guide rollers, and a first correction mechanism 1a, a first glue spraying mechanism 1b, a first rolling mill 1c, a second correction mechanism 1d, a first tension control device 1e, a second tension control device 1f, a polymer feeding device 1g, a third correction mechanism 1h, a second glue spraying mechanism 1i, a second rolling mill 1j, a third tension control device 1k, and a slitting device 1L, all of which are commercially available products with known structures. Appropriate models can be selected according to production needs, and will not be described in detail here.

[0022] The absorbent core 3 is input through the first correction mechanism 1a. The fluffy filling layer can be first combined with the PU foam layer and then input to the second correction mechanism 1d. The PU foam layer 2 is input through the second correction mechanism 1d and the first tension control device 1e. One side of the absorbent core 3 or the PU foam layer 2 is sprayed with adhesive through the first adhesive spraying mechanism 1b. The absorbent core 3 is combined with the PU foam layer 2 through the first rolling mill 1c. During the conveying process of the combined absorbent core 3 and the PU foam layer 2, the second tension control device 1f conveys them, and the surface is applied by the polymer feeding device 1g. The superabsorbent polymer resin is fed into the surface nonwoven fabric 1 through the third correction mechanism 1h. The second glue spraying mechanism 1i sprays glue onto one side of the surface nonwoven fabric 1 or the PU foam layer 2. The absorbent core 3 of the surface nonwoven fabric 1 and the composite PU foam layer 2 is compounded by the second rolling machine 1j, and then cut and output by the third tension control device 1k and the slitting device 1L. The production of the absorbent core 3 is completed. Dust removal devices 1m can be set at the input end of the absorbent core 3, the input end of the surface nonwoven fabric 1, and the position of the slitting device 1L to reduce the dust generated during the production process.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A foamed cotton composite core structure, characterized in that, From top to bottom, it includes a surface nonwoven fabric (1), a fluffy filling layer (4), a first polymer absorbent resin disposed between the surface nonwoven fabric (1) and the fluffy filling layer (4), a PU foam layer (2), and an absorbent core (3). The absorbent core (3) includes a lower absorbent layer (301) and a second polymer absorbent resin applied to the lower absorbent layer (301).

2. The foamed cotton composite core structure according to claim 1, characterized in that: The surface nonwoven fabric (1) is a spunlace nonwoven fabric, and the surface of the surface nonwoven fabric (1) has multiple openings (101).

3. The foamed cotton composite core structure according to claim 1, characterized in that: The fluffy filling layer (4) is hot air nonwoven fabric.

4. The foamed cotton composite core structure according to claim 1, characterized in that: The top surface of the lower absorbent layer (301) is provided with an upper absorbent layer (302) for covering the second polymer absorbent resin, and the upper absorbent layer (302) is provided on the bottom surface of the PU foam layer (2).

5. The foamed cotton composite core structure according to claim 4, characterized in that: The lower absorbent layer (301) and the upper absorbent layer (302) are absorbent paper.

6. The foamed cotton composite core structure according to claim 4, characterized in that: The weight of the PU foam layer (2) is 30-90% of the absorbent core (3), the thickness of the PU foam layer (2) is 1-4mm, and the PPI value of the PU foam layer (2) is 15-90.

7. A foamed cotton composite core structure according to claim 1, 2, 3, 4, or 6, characterized in that: The weight of the fluffy filler layer (4) and the first polymer absorbent resin is 30-80% of that of the absorbent core (3).

8. The foamed cotton composite core structure according to claim 6, characterized in that: The PU foam layer (2) has a central hole (2a).

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