Absorbent sanitary article, its flow control member and its absorbent core

Abstract

This utility model discloses a flow control component and its absorbent core for absorbent sanitary products. The flow control component includes an upper surface layer, a middle spacer layer, and a lower surface layer. The upper and lower surface layers are woven from yarns, and the middle spacer layer is formed by the middle layer yarns passing through the upper and lower surface layers multiple times, forming connection points. The yarns of the upper and lower surface layers and the middle layer are each formed from a single fiber or spun from several fibers. The ratio of the number of yarns in the upper surface layer to the lower surface layer per unit area is 1:1, while the ratio of the number of yarns in the middle spacer layer to the number of yarns in the upper surface layer is 0.1:1 to 20:1. By controlling the weaving composition and ratio of the yarns in the upper and lower surface layers and the middle spacer layer, a specific liquid seepage and diffusion guiding effect can be achieved.

Description

Technical Field

[0001] This utility model relates to a disposable absorbent sanitary product and the fluid flow control component used therein. More specifically, this utility model relates to an absorbent sanitary product, its flow control component, and its absorbent core. Background Technology

[0002] Disposable absorbent hygiene products such as sanitary napkins, diapers, and incontinence protection devices generally include a top layer that is permeable to liquid and faces the wearer when in use, a bottom layer that is impermeable to liquid, an absorbent core sealed between the top and bottom layers, and a fluid flow control component located between the top and bottom layers. This fluid flow control component has the function of liquid collection and storage and is also called a flow control component.

[0003] Chinese invention patent CN 201280078034.1 discloses an absorbent article having a spacer fabric as a fluid flow control component. This absorbent article is a personal hygiene item, comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent core surrounded between the top and back sheets, and a fluid flow control component disposed between the top and back sheets. The fluid flow control component is a spacer fabric with a basis weight of 150-300 gsm, and includes a top layer, a bottom layer, and an interconnecting layer of pile fibers between the top and bottom layers. The pile fibers have a fineness of 80-130 dtex, and the density of pile fiber connection points is 50-150 points / cm². However, in this patent, to ensure the softness of the material and the flow efficiency of the fluid in the interconnecting layer, the density of pile fiber connection points is limited to only 50-150 points / cm². 2 One fatal flaw of this approach is that it leads to increased backflow, severely affecting the wearing experience.

[0004] Chinese invention patent CN 201410176570.6 discloses an absorbent core, an absorbent core forming device, and a method for manufacturing the absorbent core. The absorbent core includes an absorbent core surface layer, an absorbent core middle layer, and an absorbent core bottom layer. The absorbent core middle layer and the absorbent core bottom layer are more compact than the absorbent core surface layer. That is, the aggregation degree of the fluff pulp fibers in the surface layer, middle layer, and bottom layer of the absorbent core is from relatively loose to dense, with a density gradient design, so as to quickly absorb body fluids, promote liquid penetration, and reduce the possibility of body fluid leakage from absorbent sanitary products.

[0005] Chinese utility model patent CN202020071102.3 discloses a high-absorption and high-diffusion composite core structure and an absorbent product using the same. The composite absorbent core includes an outer composite absorbent core and an inner composite absorbent core circumferentially surrounded by the outer composite absorbent core. An annular liquid diffusion guide area is provided between the outer composite absorbent core and the inner composite absorbent core. One side of the annular liquid diffusion guide area surrounds the inner absorbent core circumferentially along the outer side of the inner absorbent core, while the other side surrounds the outer absorbent core circumferentially along the inner side of the outer absorbent core, and is laterally connected to the outer absorbent core and the inner absorbent core respectively.

[0006] The aforementioned existing technologies mainly address the absorption rate, cavity construction, and the combination of hydrophilicity and hydrophobicity of each layer separately. Specifically, CN 201410176570.6 and CN 202020071102.3 primarily use short fibers and nonwovens, failing to form a complete laminate design with superior functionality. They mainly achieve localized functionality by increasing absorption capacity, designing drainage channels, designing multi-layered nonwoven layers for flow guidance and reverse osmosis, and compressing the core, without forming an overall laminate solution. CN201280078034.1 describes an absorbent article with a spacer fabric serving as a fluid flow control component, but it has a liquid-impermeable backing sheet, hindering liquid penetration from the upper layer to the lower layer, and it lacks the ability to control the directional differences in liquid diffusion in the horizontal direction.

[0007] Since the cross-section of many absorbent articles is not square but elongated, it is necessary to provide a flow control element for composite absorbent cores and absorbent sanitary articles that can control the directional difference in liquid diffusion capacity in the horizontal direction. Utility Model Content

[0008] The purpose of this invention is to provide a flow control component for composite absorbent cores and disposable absorbent hygiene products that can control the directional difference of liquid diffusion in the horizontal direction.

[0009] To achieve the aforementioned objectives, this invention provides a flow control component for absorbent sanitary products. This flow control component comprises, from top to bottom, an upper surface layer, an intermediate spacer layer, and a lower surface layer. The upper surface layer is woven from upper surface layer yarns, the lower surface layer is woven from lower surface layer yarns, and the intermediate spacer layer is formed by the intermediate layer yarns repeatedly passing through the upper and lower surface layers. The intermediate layer yarns form connection points when passing through the upper and lower surface layers. The upper surface layer yarns, lower surface layer yarns, and intermediate layer yarns are each formed from a single fiber or spun from several fibers. The weaving composition and proportion of the yarns in the upper surface layer, lower surface layer, and intermediate spacer layer are controlled such that the ratio of the number of yarns in the upper surface layer to the lower surface layer per unit area is 1:1, while the ratio of the number of yarns in the intermediate spacer layer to the number of yarns in the upper surface layer is 0.1:1 to 20:1, thereby achieving a specific liquid penetration and diffusion guiding effect.

[0010] This invention relates to a flow control component for composite absorbent cores and / or absorbent sanitary products. By controlling the weaving composition and proportion of the yarns in the upper, lower, and intermediate spacer layers of the flow control component, a specific liquid seepage diffusion guiding effect is achieved. This control has very practical technical benefits: for elongated flow control components, composite absorbent cores, and absorbent sanitary products, if the liquid diffusion capacity can be controlled to exhibit directional differences—that is, the liquid diffusion capacity differs in different directions—then making the liquid diffusion capacity in the narrower width direction less than that in the longer length direction will be highly advantageous in preventing side leakage in the width direction.

[0011] Preferably, in the flow control component of this utility model, the ratio of the number of yarns in the upper surface layer to the number of yarns in the lower surface layer per unit area is 1:1, while the ratio of the number of yarns in the intermediate spacer layer to the number of yarns in the upper surface layer is 0.2:1 to 10:1.

[0012] More preferably, in the flow control component of this utility model, the ratio of the number of yarns in the upper surface layer to the lower surface layer per unit area is 1:1, while the ratio of the number of yarns in the intermediate spacer layer to the number of yarns in the upper surface layer is 0.5:1 to 5:1.

[0013] As a specific embodiment of this utility model, the ratio of the number of yarns in the upper surface layer, the middle spacer layer, and the lower surface layer of the flow guide control component is approximately 1:1:1. This design allows the liquid falling vertically to the flow guide control component to tend to diffuse evenly in all horizontal directions of the flow guide control component.

[0014] As another specific embodiment of this utility model, the ratio of the number of yarns in the upper surface layer, the middle spacer layer and the lower surface layer of the flow guide control component is approximately 1:2:1. This scheme allows the liquid falling vertically to the flow guide control component to tend to diffuse along the warp direction woven by the flow guide control component.

[0015] In another specific embodiment of this utility model, the ratio of the number of yarns in the upper surface layer, the middle spacer layer, and the lower surface layer of the flow guide control component is approximately 1:0.67:1. This design allows liquid falling vertically to the flow guide control component to tend to diffuse along the weft direction woven into the flow guide control component.

[0016] In the flow control component of this utility model, the number of yarns in each layer can be controlled by the number of independent yarn lines during the weaving of the upper, middle, and lower layers. Each independent yarn line originates from an independent yarn ball and can be separated from yarns originating from other yarn balls. Practice has proven that the ratio of the number of independent yarn lines used to weave the upper, middle, and lower layers is consistent with the ratio of the number of yarns per unit area in the upper, middle, and lower layers; furthermore, the ratio of yarn balls used to weave the upper, middle, and lower layers is consistent with the ratio of the number of yarns per unit area in the upper, middle, and lower layers.

[0017] As can be seen, in this utility model, the proportion of yarn balls in the upper surface layer, the middle spacer layer, and the lower surface layer can be used to control the proportion of yarn strands in the upper surface layer, the middle spacer layer, and the lower surface layer per unit area, thereby achieving different abilities of liquid falling to the flow control component to diffuse in different horizontal directions of the flow control component, thus realizing directional differences.

[0018] It is worth noting that in the flow control component of this utility model, the number of yarns in each layer refers to the number of individual yarns, not the number of fibers contained in each layer of yarns. A single yarn can be spun from a number of fibers; for example, the number of fibers (filaments) in a single yarn in each layer can be 144, 72, 48, 36, or 24.

[0019] Preferably, in the flow control component of this utility model, the fineness of the upper surface yarn and the fineness of the lower surface yarn can be controlled between 30D and 150D respectively.

[0020] As a specific embodiment of this utility model, the upper and / or lower surface of the flow control component can be fluffy, for example, by pulling out yarn or by friction to obtain a fluffy surface.

[0021] In this invention, the flow control element is highly resistant to compression and possesses a free volume that allows it to contain and temporarily retain a relatively large volume of liquid. When the absorbent sanitary product is subjected to pressure applied by the wearer, the expelled bodily fluids can be effectively received into the free volume and can flow within it to different parts of the absorbent core for absorption, thereby minimizing the risk of leakage.

[0022] In this invention, the term "disposable" refers to something that is discarded after limited use without being cleaned or repaired for reuse.

[0023] In this invention, the basis weight of the entire flow control component is 30-500 gsm, and the thickness is 0.1-15 mm; preferably, the basis weight of the entire flow control component is 50-300 gsm, more preferably 60-290 gsm; when measured without applying pressure, its thickness is preferably 0.5-6 mm, more preferably 1-5 mm.

[0024] In this invention, the fibers used in each yarn include thermoplastic polymer fibers, preferably selected from, but not limited to, polyester, polyamide, and polyolefins, such as polyethylene and polypropylene, or mixtures thereof. The layers of the yarn or flow control element may also include (e.g., coated) surfactants to promote liquid penetration so that it can be rapidly drained without retaining any liquid, thereby maintaining free volume for the next outflow. Preferably, the yarns of the upper layer, the lower layer, and the middle layer are polyester.

[0025] On the other hand, in order to achieve the purpose of this invention, this invention also provides an absorbent core for absorbent sanitary products, the absorbent core including the aforementioned flow control element. This absorbent core can be a composite absorbent core.

[0026] Furthermore, this utility model also provides an absorbent sanitary product, particularly a disposable absorbent sanitary product, which includes the aforementioned flow control component.

[0027] In this invention, the absorbent hygiene products can be sanitary napkins, diapers, nursing pads, or other forms of products.

[0028] As a specific embodiment of the absorbent sanitary product of this utility model, the absorbent sanitary product may include a liquid-permeable top sheet, a liquid-impermeable bottom sheet, an absorbent core surrounding the top sheet and the bottom sheet, and the aforementioned flow control component disposed between the top sheet and the bottom sheet.

[0029] This invention relates to a flow control component that achieves a specific liquid seepage and diffusion guiding effect by controlling the weaving composition and proportion of the yarns in the upper surface layer, lower surface layer, and intermediate spacer layer, thereby preventing side leakage. This flow control component exhibits excellent control capabilities in terms of compression set, elasticity, reverse osmosis control rate, and the directionality of liquid diffusion.

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. However, these specific embodiments are merely descriptions of certain specific embodiments of the present invention and are not intended to limit the present invention. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the flow control component of this utility model; Figure 2 This diagram illustrates the uniform diffusion of liquid along the upper surface of the flow control component in all directions according to a specific embodiment of the present invention. Figure 3 A schematic diagram showing that, in another specific embodiment of this utility model, the liquid tends to diffuse more along the warp direction of the flow control element. Figure 4 This diagram illustrates that, in another specific embodiment of the present invention, the liquid tends to diffuse along the weft direction of the flow control element. The meanings of the various reference numerals in the figure are as follows: 1. The upper surface layer of the flow control component; 2. Lower surface layer of the flow control component 3. Intermediate spacer layer of the flow control component 4. The upper surface of the flow control component; 5. Liquid that diffuses uniformly in all directions along the flow control component; 6. The liquid tends to diffuse radially along the flow control components; 7. Liquids tend to diffuse in the latitudinal direction along the flow control components. Detailed Implementation

[0032] The implementation and use of various embodiments of this utility model are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of specific ways of implementing and using this utility model, and are not intended to limit the scope of this utility model. In the description, the structural positions of various components, such as upper, lower, top, bottom, etc., are not absolute but relative. These directional descriptions are appropriate when the various components are arranged as shown in the figures, but these directional descriptions also change accordingly when the positions of the various components in the figures change.

[0033] like Figure 1As shown, the flow control component of this utility model is woven by textile machinery. The flow control component includes an upper surface layer 1, an intermediate spacer layer 3 and a lower surface layer 2 from top to bottom. Each layer is woven from yarn. The upper surface layer 1 is woven from the yarn used for the upper surface layer, the lower surface layer 2 is woven from the yarn used for the lower surface layer, and the intermediate spacer layer 3 is formed by the yarn used for the intermediate spacer layer passing through the upper surface layer and the lower surface layer multiple times. The yarn of each layer can be a single fiber yarn or a yarn spun from multiple fibers.

[0034] Example 1 In this embodiment of the present invention, the flow control component comprises, from top to bottom, an upper surface layer 4, an intermediate spacer layer 3, and a lower surface layer 2. The ratio of the number of independent yarns in the upper surface layer, intermediate spacer layer, and lower surface layer is 1:1:1, that is, the ratio of the number of independent yarn balls in the upper surface layer, intermediate spacer layer, and lower surface layer is 1:1:1. When liquid falls vertically onto the flow control component woven in this manner, the liquid tends to diffuse evenly in all horizontal directions of the flow control component, such as... Figure 2 As shown, reference numeral 4 represents the upper surface layer of the flow control component, and reference numeral 5 represents the liquid falling onto the upper surface layer 4 of the flow control component, which diffuses in a basically uniform manner in all horizontal directions of the flow control component.

[0035] Example 2 In this embodiment of the present invention, the flow control component comprises, from top to bottom, an upper surface layer 4, an intermediate spacer layer 3, and a lower surface layer 2. The ratio of the number of independent yarns in the upper surface layer, intermediate spacer layer, and lower surface layer is 1:2:1, that is, the ratio of the number of independent yarn balls in the upper surface layer, intermediate spacer layer, and lower surface layer is 1:2:1. When liquid falls vertically onto the flow control component woven in this manner, the liquid tends to diffuse along the warp direction of the flow control component's weave, such as... Figure 3 As shown in the figure, reference numeral 4 represents the upper surface layer of the flow control component, and reference numeral 6 represents the liquid falling onto the upper surface layer 4 of the flow control component. The liquid tends to diffuse along the warp direction of the flow control component, that is, the diffusion ability of the liquid along the warp direction of the flow control component is greater than its diffusion ability along the weft direction of the flow control component.

[0036] Example 3 In this embodiment of the present invention, the flow control component comprises, from top to bottom, an upper surface layer 4, an intermediate spacer layer 3, and a lower surface layer 2. The ratio of the number of independent yarns in the upper surface layer, intermediate spacer layer, and lower surface layer is 1:0.67:1, that is, the ratio of the number of independent yarn balls in the upper surface layer, intermediate spacer layer, and lower surface layer is 1:0.67:1. When liquid falls vertically onto the flow control component woven in this manner, the liquid tends to diffuse along the weft direction of the flow control component's weft, such as... Figure 4 As shown in the figure, reference numeral 4 represents the upper surface layer of the flow control component, and reference numeral 7 represents the liquid falling onto the upper surface layer 4 of the flow control component. The liquid tends to diffuse along the weft direction of the flow control component, that is, the diffusion ability of the liquid along the weft direction of the flow control component is greater than its diffusion ability along the warp direction of the flow control component.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flow control element for an absorbent sanitary product, comprising, from top to bottom, an upper surface layer, an intermediate spacer layer, and a lower surface layer; the upper surface layer is woven from upper surface layer yarns, the lower surface layer is woven from lower surface layer yarns, and the intermediate spacer layer is formed by intermediate layer yarns passing through the upper surface layer and the lower surface layer multiple times; the intermediate layer yarns form connection points when passing through the upper surface layer and the lower surface layer; the upper surface layer yarns, the lower surface layer yarns, and the intermediate layer yarns are each formed from a single fiber or spun from several fibers; characterized in that... The yarn weaving composition and proportion of the upper surface layer, lower surface layer, and intermediate spacer layer in the flow guiding control component conform to the following relationship: the ratio of the number of yarns in the upper surface layer to the lower surface layer per unit area is 1:1, while the ratio of the number of yarns in the intermediate spacer layer to the number of yarns in the upper surface layer is 0.5:1 to 5:1, thereby achieving a specific liquid infiltration and diffusion guiding effect; wherein, the number of yarns in the upper surface layer, the lower surface layer, and the intermediate layer refers to the number of individual yarns, not the number of fibers contained in each layer of yarn.

2. The flow control component as described in claim 1, characterized in that, The ratio of yarn counts in the upper layer, middle spacer layer, and lower layer is 1:2:1, which causes liquid falling vertically onto the flow control element to tend to diffuse along the warp direction woven into the flow control element.

3. The flow control component as described in claim 1, characterized in that, The ratio of yarn count in the upper layer, middle spacer layer, and lower layer is 1:0.67:1, which causes liquid falling vertically onto the flow control element to tend to diffuse along the weft direction woven into the flow control element.

4. The flow control component as described in any one of claims 1-3, characterized in that, The basis weight of the flow control component is 30-500 gsm, and the thickness is 0.1-15 mm.

5. An absorbent core for an absorbent sanitary product, characterized in that, The absorber core includes the flow control element as described in any one of claims 1-4.

6. An absorbent sanitary product, characterized in that, The absorbent hygiene product includes the flow control element as described in any one of claims 1-4.

7. The absorbent sanitary product as described in claim 6, characterized in that, The absorbent sanitary product includes a liquid-permeable top sheet, a liquid-impermeable bottom sheet, an absorbent core surrounding the top sheet and the bottom sheet, and the flow control element disposed between the top sheet and the bottom sheet.

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