A paper diaper with a multifunctional flow guide layer

Abstract

The paper diaper with a multifunctional flow guide layer comprises a paper diaper substrate, which comprises a flow guide layer arranged between a core layer and a surface layer, and is composed of a lower layer, a middle support layer and an upper layer arranged in sequence from outside to inside; flow guide holes are uniformly arranged on the flow guide layer, the flow guide holes penetrate the upper and lower surfaces of the flow guide layer to form upper and lower openings, the aperture of the upper opening is larger than that of the lower opening, so that the flow guide holes are tapered holes; flow guide grooves are arranged at the edges of the flow guide layer, and comprise transverse grooves arranged at the front and rear ends of the flow guide layer and longitudinal grooves arranged at the left and right ends of the flow guide layer, the transverse grooves and the longitudinal grooves are connected in sequence to form a flow guide channel. The paper diaper provided by the application can make liquid quickly diffuse through the space gap and quickly infiltrate through the tapered holes, reduce the liquid residue on the surface layer, effectively reduce the back infiltration phenomenon, keep the skin of the wearer dry, and reduce the probability of occurrence of problems such as skin redness and eczema.

Description

Technical Field

[0001] This invention relates to the field of infant and toddler products technology, and in particular to a diaper with a multifunctional diversion layer. Background Technology

[0002] Disposable diapers are disposable hygiene products primarily used to absorb urine and keep the skin dry; they are often called diapers or disposable diapers. The main material is a special material containing superabsorbent polymer (SAP), which can quickly lock in large amounts of liquid. As a disposable hygiene product, the core requirement for disposable diapers is to quickly absorb and lock in urine and other liquids excreted by the body, keeping the wearer's skin dry while preventing leakage from the front, back, and sides. The conventional structure of existing disposable diapers includes an outer layer, a core, and a top layer arranged from the outside in. Some products add a thin distribution layer between the core and the top layer to assist in liquid diffusion, but many technical challenges still exist.

[0003] First, traditional diversion layers are mostly thin non-woven fabrics with no obvious thickness and elasticity, which cannot form effective spatial gaps. Liquid tends to accumulate locally after contacting the surface layer, resulting in slow diffusion and low absorption efficiency. The surface layer is also prone to dampness and backflow, affecting dryness. Secondly, even if some products use thick flow-guiding materials, they can only achieve basic liquid diffusion. Without a targeted infiltration structure, the liquid permeates from the flow-guiding layer to the core at a limited rate, and there is still a problem of absorption lag. Furthermore, the existing diversion structure does not have a dedicated anti-leakage groove. During the diffusion process of the diversion layer, the liquid is prone to overflow to the front, back and sides of the diaper, resulting in front and back leakage and side leakage. Furthermore, existing technologies do not combine the layered elastic materials commonly used in the textile industry with pore and groove structures, making it impossible to simultaneously meet the multiple requirements of liquid diffusion, rapid seepage, and leak prevention, thus failing to satisfy wearers' high-quality requirements for dryness and leak-proof performance.

[0004] Currently, there are layered elastic materials in the textile industry that have an upper layer, a middle support layer and a lower layer, but such materials have not yet been applied between the core and the surface layer of diapers. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a diaper with a multifunctional diversion layer added between the core layer and the surface layer, which can improve liquid absorption speed, prevent leakage, and keep the diaper dry. To solve the above-mentioned technical problems, this invention provides the following technical solution: A diaper with a multifunctional flow-guiding layer is cut from a diaper substrate, the diaper substrate comprising: The main material, used to cut into the finished shape of a diaper, consists of an outer cover layer, a core layer, and a surface layer stacked from the outside to the inside. The flow-guiding layer, used for rapid diffusion of the liquid to be absorbed, is disposed between the core layer and the surface layer, and consists of a lower layer, an intermediate support layer and an upper layer stacked sequentially from the outside to the inside. The flow guide holes are evenly distributed on the flow guide layer. The flow guide holes penetrate the upper and lower surfaces of the flow guide layer to form upper openings and lower openings. The diameter of the upper opening is larger than the diameter of the lower opening, so that the flow guide holes are tapered holes. The flow-guiding grooves are arranged at the edge of the flow-guiding layer, including transverse grooves at the front and rear ends of the flow-guiding layer and longitudinal grooves at the left and right ends of the flow-guiding layer. The transverse grooves and longitudinal grooves are connected in sequence to form a flow-guiding channel to prevent the liquid to be absorbed from leaking to the outside of the flow-guiding layer.

[0006] The overall thickness of the diversion layer is 0.8~1.2mm, preferably 1.0mm. This thickness range ensures sufficient space for liquid diffusion without increasing the overall thickness of the diaper, thus ensuring wearing comfort. The spacing between the diversion holes is preferably 8~15mm.

[0007] Based on the above technical solutions, the present invention can also adopt the following further technical solutions: The upper and lower layers of the flow guiding layer are both made of breathable non-woven fabric, and the middle support layer is a mesh structure woven from elastic fibers to form a spatial gap for the rapid diffusion of the liquid to be absorbed. The mesh structure of the middle support layer has mesh holes.

[0008] The thickness of the flow-guiding layer is 0.5~1.5mm, the diameter of the elastic fiber is 0.1~0.3mm, the pore size of the mesh is 0.2~0.5mm, the pore size of the upper opening is 2~4mm, the pore size of the lower opening is 1~1.8mm, and the spacing between adjacent flow-guiding holes is 5~20mm. This dimensional design ensures that the liquid can quickly penetrate and diffuse within the spatial gap, while maintaining the structural stability of the spatial gap and providing good elastic recovery to prevent compaction during wear.

[0009] The walls of the guide holes are smooth to allow for rapid infiltration of the liquid to be absorbed. Each square centimeter of the guide layer constitutes a unit area, and the number of guide holes per unit area is 1 to 3. The walls of the guide holes have a smooth transition structure to prevent liquid from stagnating inside the holes and ensure rapid infiltration. The limited number of guide holes per unit area balances infiltration efficiency and the structural strength of the guide layer.

[0010] The transverse grooves are arc-shaped, with a depth of 0.3-0.8 mm and a width of 3-5 mm. The longitudinal grooves also have a depth of 0.3-0.8 mm and a width of 2-4 mm. The arc-shaped structure conforms to the contours of the front and rear ends of the diaper, maximizing coverage of areas prone to liquid leakage.

[0011] The flow guiding layer and the surface layer, as well as the flow guiding layer and the core layer, are bonded together using hot melt adhesive dots, with a spacing of 5-10 mm between adjacent adhesive dots. This ensures a stable connection between the multifunctional flow guiding layer and the surface layer and core, while avoiding excessively large adhesive surfaces that could affect liquid penetration, diffusion, and the functionality of the grooves and conical holes.

[0012] The material of the flow-guiding layer has an elongation rate of 50% to 100% to ensure the integrity of the spatial gaps, flow-guiding grooves, and flow-guiding holes. The material of the flow-guiding layer is an elastic nonwoven material commonly used in the textile industry, which can maintain the structural integrity of the spatial gaps, grooves, and conical holes during the wearer's activities, and maintain a stable flow-guiding, seepage-proof, and leak-proof effect over a long period of time.

[0013] The upper surface of the core layer is provided with a flow guide groove, the position of which corresponds to the position of the flow guide trench. The space gap between the flow guide groove and the flow guide layer and the flow guide hole are interconnected to increase the permeation rate of the liquid to be absorbed from the flow guide layer to the core layer.

[0014] The core layer is composed of a mixture of superabsorbent polymer and fluff pulp.

[0015] The surface layer is made of hydrophilic nonwoven fabric, and has multiple raised textures on the side that contacts the flow-guiding layer, with a spacing of 2-3 mm between adjacent raised textures. This reduces the contact area between the surface layer and the skin, while guiding liquid to flow quickly into the spatial gaps and flow-guiding holes of the multifunctional flow-guiding layer.

[0016] Compared with the prior art, the beneficial effects that this invention can achieve are: 1. Improved liquid diffusion and absorption speed: The multi-functional diversion layer forms a 0.5~1.5mm spatial gap through the upper, middle support layer and the lower layer. After the liquid penetrates the surface layer, it can diffuse quickly within the gap, avoiding local accumulation. At the same time, the upper layer of the conical hole has a large pore diameter and the lower layer has a small pore diameter, forming a diversion channel to accelerate the downward penetration of the liquid into the core. Combined with the diffusion effect of the spatial gap, the overall absorption speed is significantly improved, solving the problem of slow absorption in existing diapers.

[0017] 2. Significantly improves dryness: Liquid can diffuse rapidly through the gaps in the space and seep quickly through the conical holes, reducing liquid residue on the surface layer, effectively reducing backflow, keeping the wearer's skin dry, reducing the probability of skin redness, eczema and other problems, and improving wearing comfort.

[0018] 3. Effectively prevents leakage: The horizontal arc-shaped grooves at both ends guide the liquid to quickly gather in the groove area and be absorbed by the core, preventing the liquid from leaking to the front and back of the diaper; the two vertical grooves in the horizontal arc-shaped grooves can block the liquid from spreading to both sides and avoid side leakage. The double groove design forms a complete leak-proof system and improves the leak-proof performance of the diaper.

[0019] 4. Significant Differentiation Advantages: By combining layered elastic materials commonly used in the textile industry with conical holes, transverse arc grooves, and longitudinal grooves, it breaks through the single-function limitations of existing flow guiding structures and achieves the triple effects of "diffusion + rapid infiltration + leakage prevention," forming a significant differentiation from existing technologies and enhancing product competitiveness.

[0020] 5. Strong compatibility and easy to implement: The multi-functional diversion layer uses existing elastic materials in the textile industry, without the need to develop new materials. The structure is reasonably designed and can be directly adapted to the existing diaper production process. Only the bonding, punching and grooving processes need to be added between the core and the surface layer. The production cost is low and it is easy to promote and apply on a large scale.

[0021] 6. Stable structure and high durability: The middle support layer of the multifunctional flow guide layer is an elastic fiber mesh structure with good elastic recovery. Even when the wearer is active, it can maintain the structural integrity of the space gaps, conical holes and grooves, maintain stable performance in the long term, and has better durability than traditional flow guide layers. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of a diaper with a multifunctional diversion layer according to the present invention.

[0023] Figure 2 This is a cross-sectional view of the diversion layer of a diaper with a multifunctional diversion layer according to the present invention.

[0024] Figure 3 This is an unfolded view of a diaper with a multifunctional flow-guiding layer according to the present invention.

[0025] The structure includes an outer cladding layer 1, a core 2, a flow guiding layer 3, a transverse arc-shaped groove 31, a longitudinal groove 32, a conical hole 33, an upper layer 34, an intermediate support layer 35, a lower layer 36, and a surface layer 4. Detailed Implementation

[0026] The accompanying drawings provide a further description of a diaper with a multifunctional diversion layer provided by the present invention.

[0027] Example 1, as Figure 1-3 As shown, a diaper with a multi-functional diversion layer includes an outer cover layer 1, a core 2, a multi-functional diversion layer 3, and a surface layer 4 arranged sequentially from the outside to the inside. The structure of each layer is as follows: The outer layer 1 is made of PE breathable membrane with a thickness of 0.02mm, which has good liquid impermeability and breathability to prevent urine leakage.

[0028] The core 2 is made of superabsorbent polymer (SAP) and fluff pulp mixed at a mass ratio of 3:2, with a thickness of 2.5mm. The surface of the core 2 facing the multifunctional flow guide layer 3 is provided with flow guide grooves corresponding to the transverse arc grooves 31 and the longitudinal grooves 32. The width of the flow guide grooves is 1mm and the depth is 0.5mm. They are connected to the spatial gaps and conical holes 33 of the multifunctional flow guide layer 3 to accelerate liquid penetration.

[0029] The functional flow guiding layer 3 uses a layered elastic nonwoven material commonly used in the textile industry, including an upper layer 34, a middle support layer 35 and a lower layer 36, with an overall thickness of 1.0 mm.

[0030] Furthermore, both the upper layer 34 and the lower layer 36 are breathable nonwoven fabrics with a thickness of 0.1 mm.

[0031] Furthermore, the intermediate support layer 35 is a mesh structure woven from elastic fibers with a diameter of 0.2 mm and a mesh size of 0.3 mm. The upper layer 34, the intermediate support layer 35, and the lower layer 36 enclose a spatial gap of 0.8 mm.

[0032] Furthermore, the multifunctional flow guide layer 3 has a uniform matrix arrangement of conical holes 33, with the upper hole diameter being 3mm, the lower hole diameter being 1.4mm, and the spacing being 12mm, with 2 conical holes 33 per square centimeter.

[0033] Furthermore, the multifunctional flow guide layer 3 has a transverse arc-shaped groove 31 at both the front and rear ends, with a groove depth of 0.5mm and a width of 4mm, and the arc-shaped contour is adapted to the front and rear ends of the diaper.

[0034] Furthermore, within the area enclosed by the transverse arc-shaped grooves 31 at both ends, there are two longitudinal grooves 32. The longitudinal grooves 32 are 0.5 mm deep and 3 mm wide, and are symmetrically arranged on both sides of the enclosed area, communicating with the transverse arc-shaped grooves 31.

[0035] Furthermore, the multifunctional flow guide layer 3 is bonded to the core 2 and the surface layer 4 with hot melt adhesive in a dotted pattern, with the adhesive dots spaced 8mm apart.

[0036] The surface layer 4 is made of hydrophilic non-woven fabric with a thickness of 0.15mm. The surface facing the multifunctional flow guide layer 3 has raised textures with a spacing of 2.5mm to guide the liquid to flow quickly into the multifunctional flow guide layer 3.

[0037] In this embodiment, after the liquid penetrates the surface layer 4, it is guided by the raised texture into the spatial gaps of the multifunctional flow-guiding layer 3, where it rapidly diffuses. Subsequently, it quickly permeates into the core through the conical holes 33. The larger pores in the upper layer facilitate liquid entry, while the smaller pores in the lower layer accelerate downward permeation. The flow-guiding grooves in the core 2 further guide the liquid diffusion and absorption. Simultaneously, the transverse arc-shaped grooves 31 prevent liquid leakage to the front and rear ends, while the longitudinal grooves 32 prevent liquid leakage to the sides, achieving rapid absorption and a dry, leak-proof effect.

[0038] Example 2: A diaper with a multifunctional diversion layer, which differs from Example 1 in that: The overall thickness of the multifunctional flow guiding layer 3 is 0.8 mm. The upper layer 34, the middle support layer 35, and the lower layer 36 form a spatial gap of 0.6 mm. The elastic fiber diameter of the middle support layer 35 is 0.1 mm, and the mesh size is 0.2 mm.

[0039] Furthermore, the upper diameter of the conical hole 33 is 2mm, the lower diameter is 1mm, the spacing is 5mm, and there are 3 conical holes 33 per square centimeter.

[0040] Furthermore, the transverse arc-shaped groove 31 has a depth of 0.3 mm and a width of 3 mm; the longitudinal groove 32 has a depth of 0.3 mm and a width of 2 mm.

[0041] Furthermore, the distance between the bonding points of the multifunctional flow guiding layer 3, the surface layer 4, and the core 2 is 5 mm. Everything else is the same as in Example 1.

[0042] In this embodiment, the spacing of the conical holes 33 is smaller and the number is greater, which further improves the liquid seepage speed; the depth and width of the grooves are slightly smaller, which reduces the impact on the structural strength of the guide layer 3 while ensuring the anti-leakage effect, making it suitable for thin diapers.

[0043] Example 3: A diaper with a multifunctional diversion layer, which differs from Example 1 in that: The multifunctional flow guiding layer 3 has an overall thickness of 1.2 mm, and the upper layer 34, the middle support layer 35, and the lower layer 36 form a 1.0 mm spatial gap. The elastic fiber diameter of the middle support layer 35 is 0.3 mm, and the mesh size is 0.5 mm.

[0044] Furthermore, the upper diameter of the conical hole 33 is 4mm, the lower diameter is 1.8mm, the spacing is 20mm, and there is one conical hole 33 per square centimeter.

[0045] Furthermore, the transverse arc-shaped groove 31 has a depth of 0.8 mm and a width of 5 mm; the longitudinal groove 32 has a depth of 0.8 mm and a width of 4 mm.

[0046] Furthermore, the distance between the bonding points of the multifunctional flow guiding layer 3 and the surface layer 4 and the core 2 is 10mm.

[0047] In this embodiment, the space gap is larger, and the liquid diffusion speed is faster; the diameter of the conical hole 33 is larger, which is suitable for scenarios with large urine output; the groove is deeper and wider, and the anti-leakage effect is stronger, which is suitable for diapers used by infants at night.

[0048] The present invention has been illustrated and described with reference to preferred embodiments; however, those skilled in the art will understand that various changes in form and detail may be made within the scope of the claims.

Claims

1. A diaper with a multifunctional diversion layer, cut from a diaper substrate, characterized in that... The diaper substrate includes: The main material, used to cut into the finished shape of a diaper, consists of an outer cover layer, a core layer, and a surface layer stacked from the outside to the inside. The flow-guiding layer, used for rapid diffusion of the liquid to be absorbed, is disposed between the core layer and the surface layer, and consists of a lower layer, an intermediate support layer and an upper layer stacked sequentially from the outside to the inside. The flow guide holes are evenly distributed on the flow guide layer. The flow guide holes penetrate the upper and lower surfaces of the flow guide layer to form upper openings and lower openings. The diameter of the upper opening is larger than the diameter of the lower opening, so that the flow guide holes are tapered holes. The flow-guiding grooves are arranged at the edge of the flow-guiding layer, including transverse grooves at the front and rear ends of the flow-guiding layer and longitudinal grooves at the left and right ends of the flow-guiding layer. The transverse grooves and longitudinal grooves are connected in sequence to form a flow-guiding channel to prevent the liquid to be absorbed from leaking to the outside of the flow-guiding layer.

2. A diaper with a multifunctional diversion layer according to claim 1, characterized in that... The upper and lower layers of the flow guiding layer are both made of breathable non-woven fabric, and the middle support layer is a mesh structure woven from elastic fibers to form a spatial gap for the rapid diffusion of the liquid to be absorbed. The mesh structure of the middle support layer has mesh holes.

3. A diaper with a multifunctional diversion layer according to claim 2, characterized in that... The thickness of the flow guiding layer is 0.5~1.5mm, the diameter of the elastic fiber is 0.1~0.3mm, the aperture of the mesh is 0.2~0.5mm, the aperture of the upper opening is 2~4mm, the aperture of the lower opening is 1~1.8mm, and the spacing between adjacent flow guiding holes is 5~20mm.

4. A diaper with a multifunctional diversion layer according to claim 1, characterized in that... The walls of the guide holes are smooth to allow for rapid infiltration of the liquid to be absorbed. Each square centimeter of the guide layer constitutes a unit area of ​​the guide layer, and the number of guide holes in each unit area is 1 to 3.

5. A diaper with a multifunctional diversion layer according to claim 1, characterized in that... The transverse groove has an arc-shaped groove structure, with a depth of 0.3~0.8mm and a width of 3~5mm. The longitudinal groove has a depth of 0.3~0.8mm and a width of 2~4mm.

6. A diaper with a multifunctional diversion layer according to claim 1, characterized in that... The flow guide layer and the surface layer, as well as the flow guide layer and the core layer, are bonded together by hot melt adhesive dots, with a spacing of 5~10mm between adjacent bonding dots.

7. A diaper with a multifunctional diversion layer according to claim 2, characterized in that... The material tensile strength of the flow guide layer is 50% to 100% to ensure the integrity of the spatial gap, flow guide groove, and flow guide hole.

8. A diaper with a multifunctional diversion layer according to claim 2, characterized in that... The upper surface of the core layer is provided with a flow guide groove, the position of which corresponds to the position of the flow guide trench. The space gap between the flow guide groove and the flow guide layer and the flow guide hole are interconnected to increase the permeation rate of the liquid to be absorbed from the flow guide layer to the core layer.

9. A diaper with a multifunctional diversion layer according to claim 7, characterized in that... The core layer is composed of a mixture of superabsorbent polymer and fluff pulp.

10. A diaper with a multifunctional diversion layer according to claim 1, characterized in that... The surface layer is made of hydrophilic nonwoven fabric, and the surface layer has multiple raised textures on the side in contact with the flow guiding layer, with a spacing of 2~3mm between adjacent raised textures.

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