Longitudinal flow composite sponge
By employing a longitudinally guided composite sponge structure in absorbent products, and utilizing polyurethane open-cell foam material and longitudinal fiber bundle design, the problem of reduced air permeability and absorbency of absorbent products under external pressure is solved, achieving highly efficient absorption and a dry user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN YANJAN NEW MATERIAL CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-07-10
AI Technical Summary
When conventional absorbent core materials, such as fluff pulp and dust-free paper, are subjected to external pressure, their thickness decreases, their breathability and absorbency decrease, and bodily fluids are easily seeped back, resulting in users feeling uncomfortable and damp.
The composite sponge structure consists of an upper sponge layer and a lower fiber web. The sponge layer is formed by polyurethane open-cell foam material. The upper longitudinal fiber bundles are connected to the lower fiber web. The fiber bundle distribution density is 1 to 50 bundles/cm2. The fibers are bicomponent or single-component and have lower hydrophilicity than the lower fiber web. Body fluid is guided along the longitudinal fiber bundles to diffuse into the lower fiber web, reducing backflow.
It improves the absorption and utilization rate and dryness of absorbent products, reduces the surface area for the penetration and diffusion of body fluids, and achieves a soft and comfortable feel and occult blood effect.
Smart Images
Figure CN224474524U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of foam materials technology, specifically to a composite sponge used in sanitary absorbent products. Background Technology
[0002] Conventional absorbent products use fluff pulp or lint-free paper as their core. However, fluff pulp and lint-free paper are only supported by fibers in the thickness direction. Under external pressure, the fiber density of fluff pulp and lint-free paper increases, and the thickness decreases sharply, thus affecting the overall breathability and absorbency of the absorbent product. Furthermore, since both fluff pulp and lint-free paper are composed of hydrophilic fibers, they can quickly absorb bodily fluids when they reach the absorbent layer. However, after absorption, some of the fluid will flow back along the fibers to the absorbent surface, resulting in significant backflow and a noticeable feeling of sluggishness and dampness for the user. Utility Model Content
[0003] The purpose of this invention is to provide a soft, comfortable, breathable composite sponge with longitudinal flow guidance, overcoming the defects of existing products.
[0004] To achieve the above objectives, the solution of this utility model is:
[0005] A longitudinally guided composite sponge, comprising an upper sponge layer and a lower fiber web; the sponge layer has discretely distributed longitudinal fiber bundles; the fibers in the longitudinal fiber bundles are the same as those in the lower fiber web and are interconnected; the upper surface of the sponge layer is away from the lower fiber web; the lower surface of the sponge layer is connected to the lower fiber web.
[0006] The number of fibers in the longitudinal fiber bundles on the upper surface of the sponge layer is less than or equal to the number of fibers in the longitudinal fiber bundles on the lower surface of the sponge layer; the longitudinal fiber bundles are connected in a fiber web either vertically or obliquely.
[0007] The upper end of the longitudinal fiber bundle is 0-8 mm above the upper surface of the sponge layer; the distribution density of the longitudinal fiber bundle in the sponge layer is 1-50 bundles / cm. 2 .
[0008] The sponge layer is formed of polyurethane open-cell foam material; the hydrophilicity of the sponge layer is less than that of the underlying fiber web.
[0009] The fibers in the longitudinal fiber bundle are bicomponent fibers, monocomponent fibers, or a mixture thereof.
[0010] The longitudinal fiber bundle includes viscose fiber or cotton fiber.
[0011] The upper end of the longitudinal fiber bundle is 0-5 mm above the upper surface of the sponge layer; the distribution density of the longitudinal fiber bundle in the sponge layer is 5-30 bundles / cm.2 .
[0012] After adopting the above solution, the composite sponge of this utility model has several longitudinal fiber bundles that are discretely distributed in the sponge layer, and the fibers in the longitudinal fiber bundles are the same as the fibers in the lower fiber network and are interconnected. When this composite sponge is used as the absorbent core of a sanitary absorbent product, when body fluids penetrate into the sponge layer of the composite sponge, the body fluids can be quickly guided to the lower fiber network along the longitudinal fiber bundles in the sponge layer. The body fluids can diffuse in all directions along the fiber network, increasing the absorption area and improving the utilization rate of the absorbent core. The sponge layer is absorbed only through the longitudinal fiber bundles. The penetration and diffusion area of the sponge layer is small, which can play a good role in occult blood function. That is, after the sanitary absorbent product is used, the body fluids are absorbed to the bottom of the absorbent core layer, and the body fluids on the surface are not obvious.
[0013] Meanwhile, the sponge layer can be made of polyurethane open-cell foam material. The pores are interconnected but not directly penetrating each other. Therefore, after the body fluid is guided to the lower fiber network, it is not easy to return to the surface layer through the polyurethane pores. Furthermore, the body fluid is absorbed through the longitudinal fiber bundles. Less body fluid remains in the polyurethane pores, which greatly improves the dryness of the absorbent product. Attached Figure Description
[0014] Figure 1 This is a cross-sectional view of the composite sponge in Embodiment 1 of this utility model;
[0015] Figure 2 This is a schematic diagram illustrating the manufacturing process of the composite sponge in Embodiment 1 of this utility model;
[0016] Figure 3 This is a cross-sectional view of the composite sponge in Embodiment 2 of this utility model;
[0017] Figure 4 This is a schematic diagram illustrating the manufacturing process of the composite sponge in Embodiment 2 of this utility model;
[0018] Figure 5 This is a cross-sectional view of the composite sponge in Embodiment 3 of this utility model;
[0019] Figure 6 This is a schematic diagram illustrating the manufacturing process of the composite sponge in Embodiment 3 of this utility model;
[0020] Symbol Explanation
[0021] Composite sponge 12, sponge layer 1, fiber web 2, longitudinal fiber bundle 3;
[0022] Needle-punching device a, needle plate a1, needle a2, needle roller a3;
[0023] Support plate b, stripping plate c. Detailed Implementation
[0024] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.
[0025] Example 1
[0026] like Figure 1 As shown, this utility model discloses a longitudinally guiding composite sponge 12, comprising a sponge layer 1 formed by an upper layer of polyurethane open-cell foam material and a lower layer of fiber web 2. The sponge layer 1 has a plurality of discretely distributed longitudinal fiber bundles 3. The fibers in the longitudinal fiber bundles 3 are the same as those in the fiber web 2 and are interconnected. The longitudinal fiber bundles 3 are perpendicular to the fiber web 2. Specifically, the upper surface of the sponge layer 1 is away from the lower layer of fiber web 2, the lower surface of the sponge layer 1 is connected to the lower layer of fiber web 2, and the number of fibers in the longitudinal fiber bundles 3 on the upper surface of the sponge layer 1 is less than or equal to the number of fibers in the longitudinal fiber bundles 3 on the lower surface of the sponge layer 1. The upper end of each longitudinal fiber bundle 3 can be 0-8 mm higher than the upper surface of the sponge layer 1, and the distribution density of the longitudinal fiber bundles 3 in the sponge layer is 1-50 bundles / cm. 2 In this embodiment 1, the longitudinal fiber bundles 3 have the same height as the sponge layer 1, and the distribution density of the longitudinal fiber bundles 3 in the sponge layer is 20 bundles / cm. 2 The hydrophilicity of the upper sponge layer 1 is less than that of the lower fiber web 2, and the fibers in the longitudinal fiber bundle 3 are bicomponent PE / PET fibers.
[0027] like Figure 2 As shown, the longitudinally guided composite sponge 12 of this utility model is manufactured by the following method: hydrophilic bicomponent PE / PET fibers are carded by a carding machine to form a lower fiber web 2. The lower fiber web 2 is then laid on the sponge layer 1 formed by the upper polyurethane open-cell foam material. It then enters between the support plate b and the stripping plate c and enters the needle punching device a. In this embodiment 1, the needle punching device a is a needle plate structure. The needles a2 are vertically distributed on the needle plate a1. During operation, the needles a2 move up and down with the needle plate a1. The sidewall of the needles a2 has hooks and barbs, which can insert the fibers of the fiber web 2 into the sponge layer 1 to form a longitudinally guided composite sponge 12 with a plurality of longitudinally distributed longitudinal fiber bundles 3 penetrating the sponge layer in the sponge layer 1.
[0028] The longitudinally guided composite sponge 12 can be used as the absorbent core of sanitary absorbent products. When body fluids penetrate into the sponge layer 1 of the composite sponge 12, the body fluids are quickly guided to the lower fiber network 2 along the longitudinal fiber bundles 3 in the sponge layer 1. The body fluids can diffuse in all directions along the lower fiber network 2, increasing the absorption area and improving the utilization rate of the absorbent core. At the same time, since the hydrophilicity of the sponge layer 1 in Example 1 is lower than that of the longitudinal fiber bundles 3, when the body fluids reach the upper surface of the sponge layer 1, they will converge from the less hydrophilic sponge surface to the more hydrophilic longitudinal fiber bundles 3, and then be absorbed through the longitudinal fiber bundles 3. This also reduces the penetration and diffusion area of the body fluids on the upper surface of the sponge layer 1, which can play a good role in occult blood function. That is, after the sanitary absorbent products are used, the body fluids are absorbed to the bottom of the absorbent core layer, and the body fluids on the surface are not obvious.
[0029] Example 2
[0030] like Figure 3 As shown, this utility model discloses a longitudinally guiding composite sponge 12, comprising a sponge layer 1 formed by an upper layer of polyurethane open-cell foam material and a lower fiber web 2. The sponge layer 1 has discretely distributed longitudinal fiber bundles 3. The fibers in the longitudinal fiber bundles 3 are the same as those in the lower fiber web 2 and are interconnected. The longitudinal fiber bundles 3 are inclined and longitudinally connected to the lower fiber web 2. The upper surface of the sponge layer 1 is far from the lower fiber web 2, and the lower surface of the sponge layer 1 is connected to the lower fiber web 2. The number of fibers in the longitudinal fiber bundles 3 on the upper surface of the sponge layer 1 is less than or equal to the number of fibers in the longitudinal fiber bundles 3 on the lower surface of the sponge layer 1. The longitudinal fiber bundles 3 are 0-8 mm higher than the upper surface of the sponge layer 1, and the distribution density of the longitudinal fiber bundles 3 in the sponge layer is 1-50 bundles / cm. 2 In this embodiment 1, the longitudinal fiber bundles 3 have the same height as the sponge layer 1, and the distribution density of the longitudinal fiber bundles 3 in the sponge layer is 15 bundles / cm. 2 The upper sponge layer 1 is a water-repellent sponge layer, the lower fiber web 2 is a hydrophilic fiber web, and the fibers in the longitudinal fiber bundle 3 are a mixture of bicomponent PE / PET fibers and monocomponent PET fibers.
[0031] like Figure 4As shown, the manufacturing method of the longitudinally guiding composite sponge 12 of this utility model is as follows: hydrophilic bicomponent PE / PET fibers and single-component PET fibers are mixed and then carded by a carding machine to form a lower fiber web 2. The lower fiber web 2 is laid on the sponge layer 1 formed by the upper polyurethane open-cell foam material, and then enters between the support plate b and the stripping plate c, and enters the needle punching device a. In this embodiment 2, the needle punching device a is a needle plate structure, and the needles a2 are obliquely distributed on the needle plate a1. During operation, the needles a2 move up and down with the needle plate a1. The side wall of the needles a2 has hooks, or the needle head of the needles a2 may have forks, which can insert the fibers of the fiber web 2 into the sponge layer 1 to form a longitudinally guiding composite sponge 12 with a plurality of longitudinally distributed longitudinal fiber bundles 3 penetrating the sponge layer in the sponge layer 1.
[0032] In this embodiment 2, the longitudinal fiber bundles 3 of the longitudinally guided composite sponge 12 are inclined longitudinally connected to the lower fiber mesh 2. Compared with the vertical longitudinal connection of the lower fiber mesh 2, this increases the distance that body fluid is guided to the lower fiber mesh 2 along the longitudinal fiber bundles 3, effectively preventing body fluid from returning to the upper surface of the sponge along the longitudinal fiber bundles 3, thus improving the dryness of the absorbent product. At the same time, although the sponge layer 1 is a polyurethane open-cell foam material, the pores are interconnected but not directly penetrating. Therefore, after the body fluid is guided to the lower fiber mesh 2, it is not easy for it to return to the surface layer through the polyurethane pores. In addition, the upper sponge layer 1 in this embodiment 2 is a water-repellent sponge layer, so the body fluid is also absorbed through the longitudinal fiber bundles. Less body fluid remains in the polyurethane pores, which also greatly improves the dryness of the absorbent product.
[0033] Example 3
[0034] like Figure 5 As shown, this utility model discloses a longitudinally guiding composite sponge 12, comprising a sponge layer 1 formed by an upper layer of polyurethane open-cell foam material and a lower layer of fiber web 2. The sponge layer 1 has discretely distributed longitudinal fiber bundles 3. The fibers in the longitudinal fiber bundles 3 are the same as those in the lower layer of fiber web 2 and are interconnected. The longitudinal fiber bundles 3 are vertically connected to the lower layer of fiber web 2. In this embodiment 3, the longitudinal fiber bundles 3 are 3 mm higher than the height of the sponge layer 1, and the distribution density of the longitudinal fiber bundles 3 in the sponge layer is 15 bundles / cm. 2 The hydrophilicity of the upper sponge layer 1 is less than that of the lower fiber web 2. The fibers in the longitudinal fiber bundle 3 are a mixture of bicomponent PE / PET fibers and cotton fibers, or a mixture of bicomponent PE / PET fibers and viscose fibers.
[0035] like Figure 6As shown, the longitudinally guided composite sponge 12 of this utility model is manufactured by the following method: hydrophilic bicomponent PE / PET fibers and cotton fibers are combed by a carding machine to form a lower fiber web 2. The lower fiber web 2 is laid on the sponge layer 1 formed by the upper polyurethane open-cell foam material, and then enters between the support plate b and the stripping plate c, and enters the needle punching device a. In this embodiment 3, the needle punching device a is a needle roller structure, and the needles a2 are vertically distributed on the needle roller a3. During operation, the needles a2 roll with the needle roller a3. The side wall of the needles a2 has hooks and barbs, which can penetrate the fibers into the sponge layer 1 to form a longitudinally guided composite sponge 12 with a plurality of longitudinally distributed longitudinal fiber bundles 3 penetrating the sponge layer in the sponge layer 1.
[0036] In this embodiment 3, the longitudinal fiber bundle 3 is 3mm higher than the sponge layer 1, forming several protrusions in the sponge layer 1. When this composite sponge is used as the absorbent core, body fluid will preferentially contact these protrusions and be absorbed and guided to the lower fiber web 2 by the longitudinal fiber bundle 3. Furthermore, these protrusions are composed of fibers, providing a soft touch, which increases the comfort of the absorbent product. It also forms a barrier layer between the surface layer of the absorbent product and the absorbent core, increasing the breathability of the absorbent product and reducing the risk of body fluid backflow. In addition, the longitudinal fiber bundle 3 contains soft cotton or viscose fibers, further enhancing the skin-friendly and soft feel of the absorbent product. Simultaneously, the needle-punching device a, employing a needle roller structure, can perform needle punching in a rolling manner, accelerating the working efficiency of the needle-punching device and increasing the production rate of the composite sponge.
[0037] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model patent and the contents of the specification should still fall within the scope of the present utility model.
Claims
1. A longitudinally guided composite sponge, characterized in that: The composite sponge comprises an upper sponge layer and a lower fiber web; the sponge layer has a plurality of longitudinally distributed fiber bundles; the fibers in the longitudinal fiber bundles are the same as those in the lower fiber web and are interconnected; the upper surface of the sponge layer is away from the lower fiber web; the lower surface of the sponge layer is connected to the lower fiber web.
2. The longitudinally guiding composite sponge as described in claim 1, characterized in that: The number of fibers in the longitudinal fiber bundles on the upper surface of the sponge layer is less than or equal to the number of fibers in the longitudinal fiber bundles on the lower surface of the sponge layer; the longitudinal fiber bundles are connected in a fiber web either vertically or obliquely.
3. The longitudinally guiding composite sponge as described in claim 1, characterized in that: The upper end of the longitudinal fiber bundle is 0-8 mm above the upper surface of the sponge layer; the distribution density of the longitudinal fiber bundle in the sponge layer is 1-50 bundles / cm. 2 .
4. The longitudinally guiding composite sponge as described in claim 1, characterized in that: The sponge layer is formed of polyurethane open-cell foam material; the hydrophilicity of the sponge layer is less than that of the underlying fiber web.
5. The longitudinally guiding composite sponge as described in claim 1, characterized in that: The fibers in the longitudinal fiber bundle are either bicomponent fibers or monocomponent fibers.
6. The longitudinally guiding composite sponge as described in claim 1, characterized in that: The longitudinal fiber bundle includes viscose fiber or cotton fiber.
7. The longitudinally guiding composite sponge as described in claim 3, characterized in that: The upper end of the longitudinal fiber bundle is 0-5 mm above the upper surface of the sponge layer; the distribution density of the longitudinal fiber bundle in the sponge layer is 5-30 bundles / cm. 2 .