A 3D three-dimensional absorbent core

Abstract

The present invention relates to the field of disposable sanitary products, and particularly to a 3D three-dimensional absorbent core body, which comprises a main body, an upper covering layer and a lower covering layer. The lower covering layer extends upward from both sides to form a wrapping portion, and the wrapping portion covers the upper covering layer. The main body comprises a main absorbent core layer, a fluffy non-woven fabric layer or a diversion non-woven fabric layer, a lower superabsorbent resin layer and a bottom wood pulp fiber layer which are stacked in sequence from top to bottom. The main absorbent core layer at least comprises an upper wood pulp fiber layer, a mixed layer of wood pulp fiber and superabsorbent resin, and a lower wood pulp fiber layer which are arranged in sequence from top to bottom. Two rows of diversion grooves are arranged on the main body, and each row of diversion grooves is composed of a plurality of diversion short grooves. The wrapping portion and the upper covering layer sink at the positions of the diversion short grooves, and there are parts where the wrapping portion and the lower covering layer are adhesively bonded to each other. It solves the technical problem that it is difficult to improve the lateral diffusion effect and air permeability of the existing multi-layer composite absorbent core body during absorption more than twice.

Description

Technical Field

[0001] The present invention relates to the field of disposable sanitary products, and particularly to a 3D three-dimensional absorbent core body. Background Art

[0002] The applicant of the present invention disclosed in CN201810863864.4 a diaper absorbent core body, which includes a main body, an upper covering layer covering the upper surface of the main body, and a lower covering layer covering the lower surface of the main body. The lower covering layer extends upward from both sides to form a wrapping portion, and the wrapping portion covers the upper covering layer. The main body includes a plurality of layers of wood pulp fiber layers and a first mixed layer stacked in sequence from top to bottom. A second mixed layer is provided between each wood pulp fiber layer. A through-flow guiding groove is provided on the main body. The wrapping portion and the upper covering layer are sunken at the position of the flow guiding groove, and the wrapping portion is adhered to the lower covering layer. It solves the technical problems of poor absorption effect, easy back leakage, and easy lumping and cotton breakage in the prior art. On this basis, the applicant found that after the domestic core body absorbs urine and body fluids once, that is, after the absorption of each layer is stable, when absorbing more than twice, it is often difficult to make the diffusion at the absorption part larger. This will result in that after the first absorption, the covered range of absorption limits the absorption part of the absorbent core, thus reducing the utilization rate of the absorbent core. Therefore, how to improve the lateral and longitudinal diffusion effects during the second and subsequent absorptions has become the research direction of the applicant. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention provides a 3D three-dimensional absorbent core body, which solves the technical problem that it is difficult to improve the lateral diffusion effect of the existing multi-layer composite absorbent core body during absorption more than twice. The utilization rate of the core body is relatively low and cannot reach a relatively high utilization rate level, such as more than 80%.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A 3D three-dimensional absorbent core body includes a main body, an upper covering layer covering the upper surface of the main body, and a lower covering layer covering the lower surface of the main body. The lower covering layer extends upward from both sides to form a wrapping portion, and the wrapping portion covers the upper covering layer. The main body includes a main absorbent core layer, a fluffy non-woven fabric layer or a flow guiding non-woven fabric layer, a lower high-absorbency resin layer, and a bottom wood pulp fiber layer stacked in sequence from top to bottom. The main absorbent core layer at least includes an upper wood pulp fiber layer, a mixed layer of wood pulp fiber and high-absorbency resin, and a lower wood pulp fiber layer arranged in sequence from top to bottom. There are two columns of flow guiding grooves on the main body, and each column of flow guiding grooves is composed of a plurality of short flow guiding grooves. The wrapping portion and the upper covering layer are sunken at the position of the short flow guiding grooves, and there is an adhered part between the wrapping portion and the lower covering layer.

[0005] Furthermore, each diversion short groove is formed by hot pressing or gluing or ultrasonic pressing. A plurality of hot pressing areas are provided on the bottom of each diversion short groove, and the hot pressing areas are arranged in a left-right offset manner in sequence along the length direction of the main body.

[0006] Furthermore, a connecting part for connecting both sides of the diversion short groove is formed between adjacent hot pressing areas on each diversion short groove.

[0007] Furthermore, a middle layer wood pulp fiber layer is further provided in the wood pulp fiber and superabsorbent resin mixed layer.

[0008] Furthermore, SAP particles are evenly distributed and embedded in the fluffy non-woven fabric layer or the diversion non-woven fabric layer.

[0009] Furthermore, the upper covering layer and / or the lower covering layer is / are non-woven fabric or expanded paper.

[0010] Furthermore, the folded part extends into the area of the upper covering layer between the two diversion grooves, and the end of the folded part is adhered to the upper covering layer.

[0011] Furthermore, the upper layer wood pulp fiber layer is mixed with polytetrafluoroethylene fibers to form a mixed layer, and the mixing weight ratio is 20 - 50:1. The polytetrafluoroethylene fibers are spiral curly short fibers.

[0012] By adopting the foregoing technical solutions, the beneficial effects of the present invention are as follows:

[0013] 1. The body includes a main absorbent core layer, a fluff non-woven fabric layer or a diversion non-woven fabric layer, a lower superabsorbent resin layer, and a bottom wood pulp fiber layer that are stacked in sequence from top to bottom. The main absorbent core layer at least includes an upper wood pulp fiber layer, a mixed layer of wood pulp fiber and superabsorbent resin, and a lower wood pulp fiber layer that are arranged in sequence from top to bottom. There are two rows of diversion grooves on the body. Such a setting can enable the mixed layer of wood pulp fiber and superabsorbent resin to achieve rapid and large-scale absorption during the first absorption, while the lower superabsorbent resin layer achieves a small amount of absorption. And after a period of time, when this absorption tends to be stable and secondary absorption occurs, the absorption method of the liquid will change. The first method is that the liquid is quickly diffused by the diversion grooves to the lower superabsorbent resin layer and the lower wood pulp fiber layer. The lower wood pulp fiber layer has a good lateral diffusion effect, and at this time, the liquid will be diffused to almost the entire body, and then conducted upward to the lower superabsorbent resin layer again, so as to achieve the purpose of rapid absorption and water locking. The second method is that the liquid passes through the upper wood pulp fiber layer, the mixed layer of wood pulp fiber and superabsorbent resin, and the lower wood pulp fiber layer from top to bottom to reach the fluff non-woven fabric or the diversion non-woven fabric layer, and then seeps downward again and is absorbed by the lower superabsorbent resin. When this method is carried out, due to the action of the upper wood pulp fiber and the lower wood pulp fiber, it will also have a certain lateral diffusion effect, so as to improve the utilization rate of the body. Compared with the existing absorbent core, the upper wood pulp fiber of this absorbent core is plant fiber, which can effectively absorb the residual monomers of SAP. These SAP residual monomers mainly refer to the unpolymerized or later-generated residual acrylic monomers in SAP. Acrylic acid is irritating to the skin. If there are too many residual monomers in SAP, it will cause harm to the baby's skin. If the baby wears a diaper for a long time and there are too many residual monomers, it will cause red buttocks.

[0014] 2. Each row of diversion grooves is composed of multiple diversion short grooves. The purpose of this is to reduce the agglomeration of the core body after absorption, and the diversion short grooves can effectively cooperate with the lower wood pulp fiber layer and the lower superabsorbent resin layer to achieve rapid diffusion and absorption during secondary absorption.

[0015] 3. Each diversion short groove is formed by hot pressing or gluing or ultrasonic pressing. There are multiple hot pressing areas on the bottom of each diversion short groove. The hot pressing areas are arranged in a left-right staggered manner in sequence along the length direction of the body. In this way, the periphery of the hot pressing area forms the bonding position of the wrapping part and the lower covering layer. The purpose of this incomplete penetration is to form a connecting part for connecting both sides of the diversion short groove between adjacent hot pressing areas on each diversion short groove. In this way, the liquid will diffuse everywhere along the connecting part at the diversion short groove, so as to enhance the rapid diffusion ability of the body, improve the air permeability, and the liquid in the middle of the body will diffuse from top to bottom and then diffuse to both sides when it is in the middle of the lower wood pulp fiber layer, so as to achieve a good lateral diffusion effect.

[0016] 4. A middle layer of wood pulp fibers is also provided within the mixed layer of wood pulp fibers and superabsorbent resin. This arrangement is beneficial for enhancing the lateral diffusion effect and preventing backflow. The middle layer of wood pulp fibers achieves upper and lower isolation, thus preventing the water-locking area from concentrating on the lower end surface of the upper layer of wood pulp fibers.

[0017] 5. SAP particles are evenly distributed and embedded within the fluffy non-woven fabric layer or the diversion non-woven fabric layer. Such an arrangement of SAP particles can achieve a better diversion effect, enabling a downward rapid penetration trend of the liquid, which is beneficial for liquid absorption. Moreover, the fluffy non-woven fabric layer or the diversion non-woven fabric layer can improve the wearing comfort. During molding, the SAP particles are evenly spread on the fluffy non-woven fabric layer or the diversion non-woven fabric layer, and then, through high-frequency oscillation, the SAP particles are embedded into the fluffy non-woven fabric layer or the diversion non-woven fabric layer, forming an intermediate layer that can achieve effective air permeability, high softness, and improved downward penetration effect.

[0018] 6. The folded part extends into the area between the two diversion grooves of the upper covering layer, and the end of the folded part is adhered to the upper covering layer. The purpose is to reduce the non-conformity between the folded part and the diversion grooves and reduce the presence of air due to the gap between the folded part and the upper covering layer, thereby reducing the diversion effect.

[0019] 7. The upper layer of wood pulp fibers is mixed with polytetrafluoroethylene fibers to form a mixed layer, and the mixing weight ratio is 20 - 50:1. The polytetrafluoroethylene fibers are spiral crimped short fibers. This arrangement endows the upper layer of wood pulp fibers with certain hydrophobic properties, which can increase the downward penetration speed of the liquid, reduce the liquid retention time, expand the air permeability of the upper layer of wood pulp fibers, and reduce liquid backflow. At the same time, it can well enable the contact between the SAP dissolution product and the skin, reducing the probability of red buttocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is Figure 1 the cross-sectional structural diagram taken along A - A in

[0022] Figure 3 is a schematic structural diagram of the diversion short groove;

[0023] Figure 4 is a schematic structural diagram of the layout of the fluffy non-woven fabric layer;

[0024] Figure 5 is a schematic structural diagram of the layout of the lower superabsorbent resin layer and the bottom layer of wood pulp fibers;

[0025] Figure 6 Yes Figure 2 It is a schematic cross-sectional structure view at the B-B position in the middle. Specific implementation mode

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation modes.

[0027] Refer to Figures 1 to 6 , this embodiment provides a 3D three-dimensional absorbent core body, which includes a main body and an upper covering layer 1 covering the upper surface of the main body and a lower covering layer 2 covering the lower surface of the main body. The upper covering layer 1 and / or the lower covering layer 2 is non-woven fabric or expanded paper. In this embodiment, both the upper covering layer 1 and the lower covering layer 2 are selected as non-woven fabrics. The lower covering layer 2 extends upward from both sides to form a folded portion 21, and the folded portion 21 covers the upper covering layer 1. The main body includes a main absorbent core layer, a fluffy non-woven fabric layer 4, a lower superabsorbent resin layer 5, and a bottom wood pulp fiber layer 6 that are stacked in sequence from top to bottom. The main absorbent core layer at least includes an upper wood pulp fiber layer 31, a mixed layer of wood pulp fiber and superabsorbent resin 32, and a lower wood pulp fiber layer 33 that are arranged in sequence from top to bottom. The upper wood pulp fiber layer 31 is mixed with polytetrafluoroethylene fibers to form a mixed layer, and the mixing weight ratio is 20-50:1. The mixing ratio in this embodiment is about 30:1, and there is no very precise numerical value. An error within a certain range is acceptable, and those skilled in the art can increase or decrease it according to actual needs. The polytetrafluoroethylene fibers are spiral curly short fibers. A middle wood pulp fiber layer 34 is also provided in the mixed layer of wood pulp fiber and superabsorbent resin 32. SAP particles 41 are evenly distributed and embedded in the fluffy non-woven fabric layer 4. In this embodiment, fluffy non-woven fabric 4 is selected as the carrier of the SAP particles 41, and the fluffy non-woven fabric can also be replaced by a diversion non-woven fabric. During molding, the SAP particles are evenly spread on the fluffy non-woven fabric layer, and then through the method of high-frequency oscillation, the SAP particles are embedded into the fluffy non-woven fabric layer.

[0028] There are two rows of diversion grooves on the main body, and each row of diversion grooves is composed of a plurality of diversion short grooves 7. The folded portion 21 and the upper covering layer 1 sink at the position of the diversion short grooves 7, and there is a mutually bonded part between the folded portion 21 and the lower covering layer 2. Each diversion short groove 7 is formed by hot pressing or gluing or ultrasonic pressing. In this embodiment, the hot pressing method is adopted. A plurality of hot pressing areas 71 are provided on the bottom of each diversion short groove 7, and the hot pressing areas 71 are arranged in a left-right staggered manner in sequence along the length direction of the main body. A connecting portion 72 for connecting both sides of the diversion short groove is formed between adjacent hot pressing areas 71 on each diversion short groove. The folded portion 21 extends into the area between the two diversion grooves of the upper covering layer 1, and the end of the folded portion 21 is bonded to the upper covering layer 1.

[0029] The forming method of the above-mentioned body is not particularly special. It is a conventional technique in this field and will not be elaborated here. Only the embedding of SAP particles in the fluffy non-woven fabric is through a special process. During forming, the SAP particles are evenly spread on the fluffy non-woven fabric layer, and then through the way of high-frequency oscillation, the SAP particles are embedded into the fluffy non-woven fabric layer.

[0030] The above-mentioned diversion channels can also be in an arc shape, that is, the shapes of the respective diversion short channels can be arc-shaped. Of course, they can also be other shapes. The respective diversion short channels can be arranged at intervals. In the extreme case, the respective diversion short channels are connected to form a whole.

[0031] The above-mentioned hot pressing area can be penetrative or non-penetrative, that is, the area where the hot pressing area is located is not penetrative. It only forms a trough-shaped body through the form of pressing. When it is in the penetrative situation, it will cause the body fluid to flow downward and then to the left and right, and can achieve a better purpose of left and right diffusion.

[0032] The distribution of the SAP particles 41 on the above-mentioned fluffy non-woven fabric layer 4 avoids the diversion channels, that is, in the area formed by the diversion channels, the SAP particles 41 are not arranged, forming an avoidance strip-shaped area 42 for avoiding the diversion channels, as Figure 4 shown in the style. The part of the avoidance strip-shaped area 42 can be beneficial to the improvement of air permeability. Even after the SAP particles 41 absorb urine, there can still be a certain space for ventilation.

[0033] The laying of the above-mentioned lower high-absorbency resin layer 5 on the bottom wood pulp fiber layer 6 can be full, or as Figure 5 shown, blank parts 61 are formed at each diversion short channel. Or, blank parts are formed at each diversion channel, such as Figure 4 shown in a similar structure.

[0034] Figure 2 、 Figure 6 The arrows shown in are the diffusion diagrams of the liquid during absorption. Since the middle part of the lower wood pulp fiber layer has a relatively fast water absorption speed and a relatively large content, it often diffuses to the surrounding areas. After such diffusion, it can be absorbed upward by the lower high-absorbency resin layer again, thus forming a diffusion guiding process, which can make the absorption speed of the absorption core faster and the utilization rate higher.

[0035] During absorption, there are mainly two aspects of absorption. The first way is that the liquid is quickly diffused by the flow guide groove to the lower high-absorbency resin layer and the lower wood pulp fiber layer. The lower wood pulp fiber layer has a good lateral diffusion effect. At this time, the liquid will be diffused to almost the entire body, and then conducted upward to the lower high-absorbency resin layer again, so as to achieve the purpose of rapid absorption and water locking. The second way is that the liquid passes through the upper wood pulp fiber layer, the mixed layer of wood pulp fiber and high-absorbency resin, and the lower wood pulp fiber layer from top to bottom to reach the fluffy non-woven fabric or the flow guide non-woven fabric layer, and then seeps downward again and is absorbed by the lower high-absorbency resin. When this way is carried out, due to the action of the upper wood pulp fiber and the lower wood pulp fiber, it also has a certain lateral diffusion effect, so as to improve the utilization rate of the body.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0037] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0040] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A 3D three-dimensional absorbent core body, comprising a main body, an upper covering layer covering the upper surface of the main body, and a lower covering layer covering the lower surface of the main body. The lower covering layer extends upward from both sides to form a folded portion, and the folded portion covers the upper covering layer. Characterized in that: The main body includes a main absorbent core layer, a fluffy non-woven fabric layer or a flow guiding non-woven fabric layer, a lower superabsorbent resin layer, and a bottom wood pulp fiber layer that are stacked in sequence from top to bottom. The main absorbent core layer at least includes an upper wood pulp fiber layer, a mixed layer of wood pulp fiber and superabsorbent resin, and a lower wood pulp fiber layer that are arranged in sequence from top to bottom. There are two rows of flow guiding grooves on the main body, and each row of flow guiding grooves is composed of a plurality of short flow guiding grooves. The folded portion and the upper covering layer sink at the position of the short flow guiding grooves, and there are parts where the folded portion and the lower covering layer are adhesively bonded to each other; Each short flow guiding groove is formed by hot pressing or gluing or ultrasonic pressing. A plurality of hot pressing areas are provided on the bottom of each short flow guiding groove, and the hot pressing areas are arranged in a left-right staggered manner in sequence along the length direction of the main body. A connecting portion for connecting both sides of the short flow guiding groove is formed between adjacent hot pressing areas on each short flow guiding groove; SAP particles are evenly distributed and embedded in the fluffy non-woven fabric layer. The SAP particles are embedded in the fluffy non-woven fabric layer by means of high-frequency oscillation. The hot pressing areas are penetrable, which enables body fluids to flow downward and then to the left and right, and can achieve a better purpose of left-right diffusion.

2. A 3D three-dimensional absorbent core body according to claim 1, Characterized in that: There is also a middle wood pulp fiber layer in the mixed layer of wood pulp fiber and superabsorbent resin.

3. A 3D three-dimensional absorbent core body according to claim 1, Characterized in that: The upper covering layer and / or the lower covering layer is / are non-woven fabric or expanded paper.

4. A 3D three-dimensional absorbent core body according to claim 1, Characterized in that: The folded portion extends into the area between the two flow guiding grooves of the upper covering layer, and the end of the folded portion is adhesively bonded to the upper covering layer.

5. A 3D three-dimensional absorbent core body according to claim 1, Characterized in that: The upper wood pulp fiber layer is mixed with polytetrafluoroethylene fibers to form a mixed layer, and the mixing weight ratio is 20 to 50:

1. The polytetrafluoroethylene fibers are spiral crimped short fibers.

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