Quick-absorption and seepage-reduction composite core body and forming process thereof

Abstract

The invention relates to the field of disposable hygienic products, in particular to a quick-absorption and seepage-reduction composite core and a forming process thereof. The composite core comprises an outer wrapping layer and a core layer located in the outer wrapping layer; 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 layer and a wood pulp composite cloth layer in a stacked mode from top to bottom, and the bamboo fiber 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. The absorption layer comprises a first polymer layer, a fluffy cotton layer and a second polymer layer which are stacked in sequence. 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 is solved.

Description

Technical Field

[0001] The invention relates to the field of disposable sanitary products, and in particular to a fast-absorbing and permeation-reducing composite core and a molding process thereof. Background Art

[0002] At present, most of the main absorption components of sanitary products are three-layer structures, which are roughly an outer coating layer and an inner absorbent material layer; and in order to increase the absorption amount and absorption rate, it is usually necessary to change the material and corresponding ratio of the inner absorbent material layer; as shown in Chinese patent application CN 114081724 A, a disposable absorbent core comprises an absorbent core body and a coating layer, and the absorbent core body comprises a water-proof layer, a water-locking layer, a water-conducting layer and an absorbent layer from top to bottom; the water-proof layer is made of PP wood pulp spunlace fabric and / or polyester wood pulp spunlace fabric; the water-locking layer comprises a fluff pulp layer and a super absorbent resin layer from top to bottom; the water-conducting layer is composed of a super absorbent resin and an elastic spunbond non-woven fabric wrapping the super absorbent resin; the absorbent layer comprises a first absorbent layer, a second absorbent layer and a third absorbent layer from top to bottom, the first absorbent layer is a super absorbent resin composite paper layer, the second absorbent layer is a super absorbent resin layer, and the third absorbent layer is at least one of a wet-strength paper layer, a dust-free paper layer and a non-woven fabric layer.

[0003] This technical solution shows the basic structure of the current multi-layer composite core. However, under this structure, the anti-reverse osmosis adopts the traditional spunlace cloth, and the water-proof layer is also the traditional fluff pulp combined with super absorbent resin, which cannot take into account both the absorption rate and the anti-reverse osmosis effect. Summary of the invention

[0004] Therefore, the present invention provides a composite core body with rapid absorption and reduced seepage and a molding process thereof, which solves the problem that the absorption rate and the anti-reverse osmosis effect cannot be achieved at the same time under the current composite core body structure.

[0005] To achieve the above object, the present invention is achieved through the following technical solutions:

[0006] A fast-absorbing and low-seepage composite core comprises an outer wrapping layer and a core layer located inside the outer wrapping layer, wherein the core layer comprises a 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 stacked in sequence from top to bottom, and the bamboo fiber polyester fiber composite cloth has a double-layer structure with a surface layer of a bamboo fiber material layer and a bottom layer of a polyester fiber material layer.

[0007] Preferably, the absorption 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 lateral sides of the lower surface of the core layer and wraps both sides of the core layer, and the folded parts on both sides do not interfere with each other and form an uncovered area on the upper surface of the core layer.

[0009] Preferably, two lateral sides of the bamboo fiber material layer extend out of the polyester fiber material layer, and are folded downward and inward to extend into the absorption layer.

[0010] A forming process of a composite core with rapid absorption and reduced permeability comprises the following steps:

[0011] S1, respectively taking bamboo fiber polyester fiber composite cloth, dust-free paper layer, absorbent layer, bamboo fiber spunlace cloth layer and wood pulp composite cloth layer materials for assembly line transportation;

[0012] S2, compounding the materials in step S1;

[0013] S3, taking the outer wrapping layer material for assembly line transportation, and placing it below the material obtained in step S2;

[0014] S4, applying glue to the upper surface of the outer wrapping layer material, and folding its width sides upward and inward to wrap the material obtained in step S2;

[0015] S5, pressing and rolling up the material obtained in step S4 to obtain the composite core.

[0016] Preferably, in the bamboo fiber polyester fiber composite cloth material, the bamboo fiber polyester fiber composite cloth is a double-layer structure with a surface layer of a bamboo fiber material layer and a bottom layer of a polyester fiber material layer, and the lateral sides of the bamboo fiber material layer extend out of the polyester fiber material layer to form a main body portion composited with the polyester fiber material layer and lateral side ends that are not composited;

[0017] The above step S1 also includes a pretreatment step for the bamboo fiber polyester fiber composite cloth material, and the pretreatment step includes:

[0018] S11, hot pressing the lateral side ends of the bamboo fiber polyester fiber composite cloth to form at least one hot pressing section;

[0019] S12, folding the hot pressing section inward and downward via a folding mechanism, so that the hot pressing section is embedded inside the lateral side end of the product obtained in step S3.

[0020] Preferably, the folding mechanism includes two symmetrically arranged folding plates with an "L-shaped" cross-section, and a special-shaped folding roller arranged behind the folding plates, and the surface of the special-shaped folding roller is provided with a guide roller portion for folding and guiding the hot pressing section.

[0021] By adopting the above technical solution, the beneficial effects of the present invention are:

[0022] This technical solution adopts the bamboo fiber polyester fiber composite cloth as a different material to obtain the dual effects of rapid absorption and reverse osmosis. The bamboo fiber material layer can quickly capture water, so that the liquid falling on the core layer can be quickly guided downward, which plays a role in increasing the absorption speed; the polyester fiber material layer at the lower end cooperates with it to ensure that the liquid introduced into the core will not reverse upward to reduce back seepage;

[0023] At the same time, the bamboo fiber spunlace fabric layer and the wood pulp composite fabric layer at the lower end of the core layer both have strong water absorption, which can quickly absorb the liquid transmitted from layer to layer and guide it to seep downward. While quickly absorbing and reducing back seepage, it can also speed up the rapid color development of the urine display structure of the diaper product, reminding users and guardians to change it in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the stacked structure of a composite core body according to an embodiment of the present invention;

[0025] Figure 2 This is a structural schematic diagram of the molding process of the composite core in the first embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the stacked structure of the composite core body of the second embodiment of the present invention;

[0027] Figure 4 This is a structural schematic diagram of the pretreatment process of the bamboo fiber polyester fiber composite cloth according to the second embodiment of the present invention;

[0028] Figure 5 This is a structural schematic diagram of a folding mechanism according to a second embodiment of the present invention;

[0029] Figure 6 It is a schematic structural diagram of a special-shaped folding roller according to embodiment 2 of the present invention.

[0030] Figure numerals: 1, outer wrapping layer; 1a, uncovered area; 2, bamboo fiber polyester fiber composite cloth; 21, bamboo fiber material layer; 21a, main body; 21b, lateral side end; 211, hot pressing section; 22, polyester fiber material layer; 3, dust-free paper layer; 4, absorption layer; 41, first polymer layer; 42, second polymer layer; 43, fluffy cotton layer; 5, bamboo fiber spunlace cloth layer; 6, wood pulp composite cloth layer; 100, folding plate; 200, special-shaped folding roller; 201, guide roller part. DETAILED DESCRIPTION

[0031] The following will describe the implementation methods of the present invention in detail in conjunction with specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0032] Embodiment 1

[0033] refer to Figure 1 A composite core with fast absorption and reduced permeability, comprising an outer wrapping layer 1 and a core layer located inside the outer wrapping layer 1, wherein the core layer is stacked from top to bottom in sequence: a bamboo fiber polyester fiber composite cloth 2, a dust-free paper layer 3, an absorption layer 4, a bamboo fiber spunlace cloth layer 5 and a wood pulp composite cloth layer 6, wherein the bamboo fiber polyester fiber composite cloth 2 is a double-layer structure with a surface layer of a bamboo fiber material layer 21 and a bottom layer of a polyester fiber material layer 22.

[0034] The instantaneous water-grabbing ability of the traditional composite core is weaker than that of the wood pulp core. Therefore, the present technical solution adopts the bamboo fiber polyester fiber composite cloth 2 as a different material to obtain the dual effects of quick absorption and reverse osmosis. The bamboo fiber material layer 21 can quickly grab water, so that the liquid falling on the core layer can be quickly guided downward, which plays a role in increasing the absorption speed; the polyester fiber material layer 22 at the lower end cooperates with it to ensure that the liquid introduced into the core will not reverse upward to reduce back seepage;

[0035] At the same time, the bamboo fiber spunlace fabric layer 5 and the wood pulp composite fabric layer 6 at the lower end of the core layer both have strong water absorption, which can quickly absorb the liquid transmitted from layer to layer and guide it to seep downward. While quickly absorbing and reducing back seepage, it can also speed up the rapid color development of the urine display structure of the diaper product, reminding the user or guardian to change it in time.

[0036] Structurally, the absorbent layer 4 is a first polymer layer 41, a fluffy cotton layer 43 and a second polymer layer 42 stacked in sequence. In this way, while ensuring the overall absorption capacity of the absorbent layer 4, the interlaced layered structure is adopted, and the polymer material can be fully utilized to avoid the polymer under the single-layer structure being too thick after the layer is piled up to affect the utilization rate.

[0037] In this embodiment, the outer wrapping layer 1 is folded upward and inward from both sides of the lower surface of the core layer and wraps the two sides of the core layer, and 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. In this way, the bamboo fiber polyester fiber composite fabric 2 can be directly exposed under the surface layer or the guide layer of the traditional absorbent article, serving as the first contact part between the composite core and the liquid, ensuring its rapid absorption and anti-seepage effects.

[0038] The specific molding process of the composite core is as follows.

[0039] like Figure 2As shown, a molding process of a composite core with rapid absorption and reduced permeability comprises the following steps:

[0040] S1, respectively take the bamboo fiber polyester fiber composite cloth 2, the dust-free paper layer 3, the absorption layer 4, the bamboo fiber spunlace cloth layer 5 and the wood pulp composite cloth layer 6 materials for assembly line transportation; wherein, the first polymer layer 41 in the absorption layer 4 is first placed on the fluffy cotton layer 43 and then continues to be transported; the second polymer layer 42 is correspondingly placed after the bamboo fiber spunlace cloth layer 5 and continues to be transported;

[0041] S2, compounding the materials in step S1; compounding here means to gather the conveying ends of the production lines of the materials of each layer, shorten the distance between the layers, and convey them on a single production line after compaction by rollers; this process can be simple compounding by hot pressing without glue application, which varies according to the specific production conditions;

[0042] S3, taking the outer wrapping layer 1 material for assembly line transportation, and placing it below the material obtained in step S2;

[0043] S4, applying glue to the upper surface of the outer wrapping layer 1 material, and folding its width sides 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 touch each other, so as to obtain an uncovered area 1a that exposes the bamboo fiber polyester fiber composite cloth 2.

[0044] S5. The material obtained in step S4 is pressed and rolled up to obtain the composite core, which is then used for the subsequent production of absorbent articles. This production process can be added to the in-line production of absorbent articles.

[0045] It should be noted that this embodiment does not describe the equipment such as deviation correction and material storage required in the sheet conveying process, which is well known to those skilled in the art and will not be described in detail here.

[0046] Embodiment 2

[0047] refer to Figure 3 , compared with the first embodiment in structure, the two lateral sides of the bamboo fiber material layer 21 extend out of the polyester fiber material layer 22, and are folded downward and inward to extend into the absorbent layer 4. Among them, this folding process needs to be before the layers of materials are completely compounded (that is, there is a certain gap), and the folding and embedding process needs to be a slow process because it is in the process of conveying on the assembly line; specifically, in the bamboo fiber polyester fiber composite cloth 2 material, the bamboo fiber polyester fiber composite cloth 2 is a double-layer structure with the surface layer of the bamboo fiber material layer 21 and the bottom layer of the polyester fiber material layer 22. The two lateral sides of the bamboo fiber material layer 21 extend out of the polyester fiber material layer 22, forming a main body 21a compounded with the polyester fiber material layer 22 and a lateral side end 21b that is not compounded;

[0048] Compared with the first embodiment, the above step S1 further includes a pretreatment step for the bamboo fiber polyester fiber composite cloth 2 material, such as Figure 4 As shown, the pre-processing step includes:

[0049] S11. Hot-press the lateral side end 21b on the bamboo fiber polyester fiber composite cloth 2 to form two side-by-side hot-pressed sections 211; the hot-pressed section 211 here refers to a part with toughness and reduced softness, which can be completely embedded in the process of guiding and folding; the hot-pressed section 211 can be increased according to the maturity of the production line to form a multi-level repeatedly folded bamboo fiber material layer 21 structure located on both sides of the composite core; with the quick-absorbing structure of the bamboo fiber material layer 21, the liquid located at the lateral edge can be directly guided downward over the polyester fiber material layer 22, thereby reducing the amount of liquid passing through the polyester fiber material layer 22, thereby increasing the absorption rate and reducing the occurrence of reverse osmosis in another way.

[0050] S12, folding the hot pressing section 211 inward and downward via a folding mechanism, so that the hot pressing section 211 is embedded inside the lateral side end of the product obtained in step S3; Figure 5 , Figure 6 As shown, the folding mechanism is redesigned for this specific process, including two symmetrically arranged folding plates 100 with an "L-shaped" cross section, and a special-shaped folding roller 200 arranged behind the folding plate 100. The surface of the special-shaped folding roller 200 is provided with a guide roller part 201 for folding and guiding the hot pressing section 211. Among them, the traditional folding plate 100 cannot meet the production process of partially embedding the hot pressing section 211 with toughness; a large distance needs to be left between the folding plate 100 and the special-shaped folding roller to ensure the complete and smooth guidance of the hot pressing section 211; the lower roller body part of the guide roller part 201 is detachable, and can be changed according to the different folding heights; the upper special-shaped roller body part (here the projected part is elliptical) is designed accordingly, and the large area contact at the input end gradually extends the folded part into between the layers of materials as the special-shaped folding roller 200 rotates. Different from the traditional folding structure, the special-shaped folding roller 200 can flexibly and dynamically perform folding and guiding actions, can fully guide, and has very good equipment support for the long-term continuation of the folding process and the smoothness of operation.

[0051] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A composite core with rapid absorption and reduced permeability, characterized in that: The invention comprises an outer wrapping layer (1) and a core layer located inside the outer wrapping layer (1), wherein the core layer comprises a bamboo fiber polyester fiber composite cloth (2), a dust-free paper layer (3), an absorption layer (4), a bamboo fiber spunlace cloth layer (5) and a wood pulp composite cloth layer (6) stacked in sequence from top to bottom, and the bamboo fiber polyester fiber composite cloth (2) is a double-layer structure with a surface layer of a bamboo fiber material layer (21) and a bottom layer of a polyester fiber material layer (22).

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

3. A 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 both sides of the lower surface of the core layer and wraps 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 two lateral sides of the bamboo fiber material layer (21) extend out of the polyester fiber material layer (22), and are folded downward and inward to extend into the absorption layer (4).

5. A molding process for a composite core with rapid absorption and reduced permeability according to claim 1, characterized in that: The following steps are involved: S1, respectively taking the bamboo fiber polyester fiber composite cloth (2), the dust-free paper layer (3), the absorption layer (4), the bamboo fiber spunlace cloth layer (5) and the wood pulp composite cloth layer (6) for conveying on an assembly line; S2, compounding the materials in step S1; S3, taking the outer wrapping layer (1) material for assembly line transportation, and placing it below the material obtained in step S2; S4, applying glue to the upper surface of the outer wrapping layer (1) material, and folding its width sides upward and inward to wrap the material obtained in step S2; S5, pressing and rolling up the material obtained in step S4 to obtain the composite core.

6. The molding process of a composite core with rapid absorption and reduced permeability according to claim 5, characterized in that: In the bamboo fiber polyester fiber composite cloth (2) material, the bamboo fiber polyester fiber composite cloth (2) is a double-layer structure with a surface layer of a bamboo fiber material layer (21) and a bottom layer of a polyester fiber material layer (22), and the lateral sides of the bamboo fiber material layer (21) extend out of the polyester fiber material layer (22) to form a main body (21a) composited with the polyester fiber material layer (22) and a lateral side end (21b) not composited with the polyester fiber material layer (22); The above step S1 also includes a pretreatment step for the bamboo fiber polyester fiber composite cloth (2) material, and the pretreatment step includes: S11, hot pressing the lateral side end portion (21b) of the bamboo fiber polyester fiber composite cloth (2) to form at least one hot pressing section (211); S12, folding the hot pressing section (211) inward and downward along a folding mechanism, so that the hot pressing section (211) is embedded inside the lateral side end of the product obtained in step S3.

7. The molding process of the composite core with rapid absorption and reduced permeability according to claim 6, characterized in that: The folding mechanism comprises two symmetrically arranged folding plates (100) with an L-shaped cross section, and a special-shaped folding roller (200) arranged behind the folding plates (100) for conveying, wherein the surface of the special-shaped folding roller (200) is provided with a guide roller portion (201) for folding and guiding the hot pressing section (211).

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