Quick-absorption and seepage-reduction composite core body

Abstract

The utility model relates to the field of disposable hygienic products, in particular to a quick-absorption and seepage-reduction composite core body which comprises an outer wrapping layer and a core body layer located in the outer wrapping layer, and the core body layer is sequentially provided with bamboo fiber polyester fiber composite cloth, a dust-free paper layer, an absorption layer, a bamboo fiber spunlace cloth layer and a wood pulp composite cloth layer in a stacked mode from top to bottom. The bamboo fiber and polyester fiber composite cloth is of a double-layer structure with the surface layer being a bamboo fiber material layer and the bottom layer being a polyester fiber material layer, and the absorption layer is a first macromolecule layer, a fluffy cotton layer and a second macromolecule layer which are sequentially stacked. The composite core body structure solves the problem that the absorption rate and the reverse osmosis prevention effect cannot be achieved at the same time under an existing composite core body structure.

Description

Technical Field

[0001] This utility model relates to the field of internal absorbent component structure of disposable hygiene products, specifically to a composite core that provides rapid absorption and reduced seepage. Background Technology

[0002] Currently, most absorbent components in hygiene products have a three-layer structure, consisting of an outer covering layer and an inner absorbent material layer. To improve absorption capacity and rate, it is usually necessary to change the material and proportions of the inner absorbent material layer. For example, Chinese patent application CN 114081724 A describes a disposable absorbent core comprising an absorbent core body and a covering layer. The absorbent core body, from top to bottom, includes a waterproof layer, a water-locking layer, a water-conducting layer, and an absorbent layer. The waterproof layer is made of PP wood pulp spunlace fabric and / or polyester wood pulp spunlace fabric. The water-locking layer, from top to bottom, includes a fluff pulp layer and a superabsorbent resin layer. The water-conducting layer is composed of superabsorbent resin and an elastic spunbond nonwoven fabric encapsulating the superabsorbent resin. The absorbent layer, from top to bottom, includes a first absorbent layer, a second absorbent layer, and a third absorbent layer. The first absorbent layer is a superabsorbent resin composite paper layer, the second absorbent layer is a superabsorbent resin layer, and the third absorbent layer is at least one of a wet-strength paper layer, a dust-free paper layer, and a nonwoven fabric layer.

[0003] This technical solution demonstrates the basic structure of current multi-layered composite cores. However, in this structure, the anti-backflow layer uses traditional spunlace fabric, and the waterproof layer is also made of traditional fluff pulp combined with superabsorbent resin, which cannot simultaneously achieve both absorption rate and anti-backflow effect. Utility Model Content

[0004] Therefore, this invention provides a composite core with rapid absorption and reduced seepage, which solves the problem that the current composite core structure cannot simultaneously achieve both absorption rate and anti-reverse seepage effect.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A composite core for rapid absorption and reduced seepage includes an outer wrapping layer and a core layer located inside the outer wrapping layer. The core layer consists of a bamboo fiber polyester fiber composite fabric, a dust-free paper layer, an absorbent layer, a bamboo fiber spunlace fabric layer, and a wood pulp composite fabric layer stacked sequentially from top to bottom. The bamboo fiber polyester fiber composite fabric has a double-layer structure with a bamboo fiber material layer on the surface and a polyester fiber material layer on the bottom.

[0007] Preferably, the absorbent layer is a first polymer layer, a fluffy cotton layer, and a second polymer layer stacked in sequence.

[0008] Preferably, the outer wrapping layer is folded upward and inward from both sides of the lower surface of the core layer and wraps around both sides of the core layer. The folded portions on both sides do not interfere with each other and form an uncovered area on the upper surface of the core layer.

[0009] Preferably, the bamboo fiber material layer extends beyond the polyester fiber material layer on both sides and folds downward and inward into the absorbent layer.

[0010] Preferably, hot-pressed sections are formed on the fiber material layer extending outside the polyester fiber material layer by hot pressing, and each hot-pressed section extends into the absorbent layer.

[0011] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This technical solution uses the bamboo fiber and polyester fiber composite fabric, a different material, to achieve the dual effects of rapid absorption and reverse seepage. The bamboo fiber material layer can quickly capture moisture, allowing the liquid falling into the core layer to be quickly guided downwards, thereby increasing the absorption speed. The polyester fiber material layer at the lower end works in conjunction with this to ensure that the liquid introduced into the core does not seep upwards, thus reducing backflow.

[0012] Meanwhile, the bamboo fiber spunlace fabric layer and the wood pulp composite fabric layer, located at the lower end of the core layer, both have strong water absorption. This allows the liquid that is transferred layer by layer to be absorbed quickly and guided downwards. While absorbing quickly and reducing backflow, it can also accelerate the color development of the diaper's wetness indicator structure, reminding users and caregivers to change the diaper in time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the stacked structure of the composite core in Embodiment 1 of this utility model;

[0014] Figure 2 This is a schematic diagram of the molding process of the composite core in Embodiment 1 of this utility model;

[0015] Figure 3 This is a schematic diagram of the stacked structure of the composite core in Embodiment 2 of this utility model;

[0016] Figure 4 This is a schematic diagram of the pretreatment process of bamboo fiber and polyester fiber composite fabric in Embodiment 2 of this utility model.

[0017] Figure 5 This is a schematic diagram of the folding mechanism in Embodiment 2 of this utility model;

[0018] Figure 6 This is a schematic diagram of the irregular folding roller in Embodiment 2 of this utility model.

[0019] Reference numerals: 1. Outer wrapping layer; 1a. Uncovered area; 2. Bamboo fiber polyester composite fabric; 21. Bamboo fiber material layer; 21a. Main body; 21b. Lateral side end; 211. Hot-pressed section; 22. Polyester fiber material layer; 3. Dust-free paper layer; 4. Absorbent layer; 41. First polymer layer; 42. Second polymer layer; 43. Fluffy cotton layer; 5. Bamboo fiber spunlace fabric layer; 6. Wood pulp composite fabric layer; 100. Folded board; 200. Irregularly shaped folding roller; 201. Guide roller section. Detailed Implementation

[0020] The following will describe the implementation of this utility model in detail with reference to specific embodiments, so that the process of how this utility model uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0021] Example 1

[0022] refer to Figure 1 A composite core for rapid absorption and reduced seepage includes an outer wrapping layer 1 and a core layer located inside the outer wrapping layer 1. The core layer consists of a bamboo fiber polyester fiber composite fabric 2, a dust-free paper layer 3, an absorbent layer 4, a bamboo fiber spunlace fabric layer 5, and a wood pulp composite fabric layer 6, which are stacked sequentially from top to bottom. The bamboo fiber polyester fiber composite fabric 2 has a double-layer structure with a bamboo fiber material layer 21 on the surface and a polyester fiber material layer 22 on the bottom.

[0023] Traditional composite cores have weaker instantaneous water-holding capacity than wood pulp cores. Therefore, this technical solution uses the bamboo fiber-polyester fiber composite fabric 2, a different material, to achieve a dual effect of rapid absorption and reverse seepage. The bamboo fiber material layer 21 can quickly capture water, allowing liquid falling onto the core layer to be quickly guided downwards, thereby increasing the absorption rate. The polyester fiber material layer 22 at the lower end works in conjunction with this to ensure that the liquid introduced into the core does not seep upwards, thus reducing backflow.

[0024] Meanwhile, the bamboo fiber spunlace fabric layer 5 and the wood pulp composite fabric layer 6, located at the lower end of the core layer, both have strong water absorption, which allows the liquid transmitted layer by layer to be absorbed quickly and guided downward. While absorbing quickly and reducing backflow, they can also accelerate the color development of the diaper's wetness indicator structure, reminding the user or guardian to change the diaper in time.

[0025] Structurally, the absorbent layer 4 consists of a first polymer layer 41, a fluffy cotton layer 43, and a second polymer layer 42 stacked sequentially. This design ensures the overall absorption capacity of the absorbent layer 4 while employing an intermittent layered structure, allowing for full utilization of the polymer material and avoiding excessively thick layers that would affect utilization efficiency in a single-layer structure.

[0026] In this embodiment, the outer wrapping layer 1 is folded upwards and inwards from both sides of the lower surface of the core layer, wrapping around both sides of the core layer. The folded portions on both sides do not interfere with each other and form an uncovered area 1a on the upper surface of the core layer. This allows the bamboo fiber polyester fiber composite fabric 2 to be directly exposed to the surface layer or under the guide layer of a traditional absorbent material, serving as the first contact part between the composite core and the liquid, ensuring its rapid absorption and seepage prevention effects.

[0027] The following is the specific molding process of the above composite core.

[0028] like Figure 2 As shown, a molding process for a rapidly absorbent and permeable composite core includes the following steps:

[0029] S1. Bamboo fiber polyester fiber composite cloth 2, dust-free paper layer 3, absorbent layer 4, bamboo fiber spunlace cloth layer 5, and wood pulp composite cloth layer 6 are respectively transported in an assembly line; wherein, the first polymer layer 41 in the absorbent layer 4 is first fed onto the fluffy cotton layer 43 and then continued to be transported; the second polymer layer 42 is correspondingly fed onto the bamboo fiber spunlace cloth layer 5 and then continued to be transported.

[0030] S2. Composite the materials from step S1. Composite here means bringing together the conveyor ends of the various layers of materials, shortening the distance between the layers, and then compacting them with pressure rollers before conveying them in a single conveyor line. This process can be done with or without adhesive, using simple hot pressing. The specific production conditions will vary.

[0031] S3. Take the outer wrapping layer 1 material and transport it on the production line, placing it below the material obtained in step S2;

[0032] S4. Apply adhesive to the upper surface of the outer wrapping layer 1 material and fold both sides of its width upward and inward to wrap the material obtained in step S2; wherein the folding process ensures that the folded parts at both ends do not contact each other, so as to obtain the uncovered area 1a of the bamboo fiber polyester fiber composite fabric 2.

[0033] S5. After pressing the material obtained in step S4, it is wound up to obtain the composite core, which is then used for the production of absorbent articles. This production process can be added to the production line of absorbent articles.

[0034] It should be noted that this embodiment does not describe the equipment used for correction and storage during the sheet conveying process, as these are well known to those skilled in the art and will not be elaborated here.

[0035] Example 2

[0036] refer to Figure 3Compared with Embodiment 1, structurally, the bamboo fiber material layer 21 extends beyond the polyester fiber material layer 22 on both sides and folds downward and inward into the absorbent layer 4. This folding process needs to be completed before all layers are fully bonded (i.e., with a certain gap), and the folding and embedding process requires a smooth flow due to the assembly line transport. Specifically, the bamboo fiber polyester fiber composite fabric 2 has a double-layer structure with a bamboo fiber material layer 21 as the outer layer and a polyester fiber material layer 22 as the inner layer. The bamboo fiber material layer 21 extends beyond the polyester fiber material layer 22 on both sides, forming a main body 21a bonded to the polyester fiber material layer 22 and a non-bonded lateral end portion 21b.

[0037] Compared with Example 1, step S1 above also includes a pretreatment step for the bamboo fiber polyester fiber composite fabric 2 material, such as... Figure 4 As shown, the preprocessing step includes:

[0038] S11. The transverse end 21b of the bamboo fiber polyester fiber composite fabric 2 is hot-pressed to form two parallel hot-pressed sections 211. Here, the hot-pressed section 211 refers to forming a part with reduced toughness and softness, so that it can be completely embedded during the guiding folding process. The hot-pressed section 211 can be increased according to the maturity of the production line to form a multi-layered, repeatedly folded bamboo fiber material layer 21 structure on both sides of the transverse side of the composite core. With the fast absorption structure of the bamboo fiber material layer 21, liquid located at the transverse edge can be directly guided downward through the polyester fiber material layer 22, reducing the amount of liquid passing through the polyester fiber material layer 22, thereby increasing the absorption rate and reducing backflow from another perspective.

[0039] S12. Fold the hot-pressed section 211 inward and downward along the folding mechanism, so that the hot-pressed section 211 is embedded inside the lateral side end of the product obtained in step S3; Figure 5 , Figure 6As shown, the folding mechanism has been redesigned for this specific process, including two symmetrically arranged folding plates 100 with an "L"-shaped cross-section, and an irregularly shaped folding roller 200 located behind the folding plates 100. The irregularly shaped folding roller 200 has a guide roller section 201 on its surface for folding and guiding the hot-pressed section 211. Traditional folding plates 100 cannot meet the production process of embedding the resilient hot-pressed section 211; a large gap needs to be maintained between the folding plates 100 and the irregularly shaped folding roller to ensure the integrity and smooth guidance of the hot-pressed section 211; the lower roller section of the guide roller section 201 is detachable, allowing it to vary according to the folding height; the upper irregularly shaped roller section (represented here by an elliptical projection) is designed accordingly, with a large contact area at the input end, gradually allowing the folded portion to extend between the layers of material as the irregularly shaped folding roller 200 rotates. Unlike traditional folding structures, the irregularly shaped folding roller 200 can flexibly and dynamically perform folding and guiding actions, providing excellent guidance and offering excellent equipment support for long-term continuous folding processes and stable operation.

[0040] 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 composite core for rapid absorption and reduced permeability, characterized in that: It includes an outer wrapping layer (1) and a core layer located inside the outer wrapping layer (1). The core layer consists of a bamboo fiber polyester fiber composite fabric (2), a dust-free paper layer (3), an absorbent layer (4), a bamboo fiber spunlace fabric layer (5), and a wood pulp composite fabric layer (6) stacked sequentially from top to bottom. The bamboo fiber polyester fiber composite fabric (2) has a double-layer structure with a bamboo fiber material layer (21) on the surface and a polyester fiber material layer (22) on the bottom.

2. The composite core with rapid absorption and reduced permeability according to claim 1, characterized in that: The absorbent layer (4) consists of a first polymer layer (41), a fluffy cotton layer (43), and a second polymer layer (42) stacked in sequence.

3. The composite core with rapid absorption and reduced permeability according to claim 1, characterized in that: The outer wrapping layer (1) is folded upward and inward from the lower surface of the core layer on both sides and wraps around the two sides of the core layer. The folded parts on both sides do not interfere with each other and form an uncovered area (1a) on the upper surface of the core layer.

4. The composite core with rapid absorption and reduced permeability according to claim 1, characterized in that: The bamboo fiber material layer (21) extends out of the polyester fiber material layer (22) on both sides and folds down and inward into the absorbent layer (4).

5. The composite core with rapid absorption and reduced permeability according to claim 4, characterized in that: Hot-pressed sections (211) are formed on the fiber material layer extending outside the polyester fiber material layer (22) by hot pressing, and each hot-pressed section (211) extends into the absorbent layer (4).

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