Manufacturing process of wearable absorption product with breathing ventilation function

Abstract

The invention discloses a manufacturing process of a wearable absorption product with a breathing ventilation function, which comprises the following steps: S1, punching a water-repellent non-woven fabric to form a punching layer, S2, carrying out dotted thermocompression bonding on a hydrophilic non-woven fabric and the punching layer to realize local melting and bonding, S3, preparing a multi-layer composite absorption core body, S4, preparing a composite bottom layer, S5, carrying out hot pressing on the multi-layer composite absorption core body, and S5, carrying out hot pressing on the multi-layer composite absorption core body. The isolation layer, the flow guide layer, the absorption core body and the composite bottom layer are sequentially compounded to obtain the paper diaper, the water repellent layer achieves rapid absorption of urine through the absorption hole array, the hydrophilic layer accelerates liquid conduction, the surface of the paper diaper is kept dry while rapid absorption is achieved, and the paper diaper is not prone to falling off. The absorption core body adopts a gradient structure with the thickness gradually increased layer by layer and the content of the high-molecular water-absorbent resin multiplied, the total absorption amount is increased, the reverse osmosis rate is low, air exchange is carried out through the air exchange space below the absorption core body, and damp and hot air generated in the absorption product can be exhausted through the bottom layer.

Description

Technical Field

[0001] The invention relates to the technical field of absorbent products, and in particular to a manufacturing process of a wearable absorbent product with breathing and ventilation functions. Background Art

[0002] The liquid absorption efficiency, surface dryness, and moisture permeability and heat dissipation capabilities of diapers are directly related to the wearing comfort and skin health of infants and young children. Traditional products usually rely on a multi-layer composite structure to achieve liquid locking and leak-proof functions, but this design has shown three major defects in long-term use: the penetration efficiency of the guide layer material is not up to standard, which can easily cause liquid retention, the polymer core has insufficient heat dissipation performance, resulting in stuffiness accumulation, and the overall structure has poor air permeability, which can cause skin irritation risks.

[0003] In the prior art, Patent No. CN202021880117.0 shows a pair of breathable pull-up pants, which consists of a main absorption module and an elastic waist assembly. Its structure consists of a composite contact layer with a two-way fiber arrangement process (upper longitudinal / lower transverse hot air treatment), an active breathable functional layer and an ultra-thin double spunlace core. The above-mentioned pull-up pants use elastic foam material instead of conventional breathable membranes, and drive internal gas exchange through pressure changes when the infant is sitting, thereby realizing dynamic moisture removal and heat dissipation functions.

[0004] Although the above-mentioned breathable pull-up pants can discharge the hot and humid gases in diapers through the combined design of a double-layer composite soft surface layer, a breathable and breathable layer and a double spunlace ultra-thin core layer, there are still some shortcomings in its structure. Specifically, although the three-dimensional structure of the surface adopts spherical cavity protrusions to reduce the contact area, the capillary effect formed by the protrusion gaps on the microstructure can easily lead to liquid back-seepage, affecting the quick-drying performance of the surface layer. At the same time, the ventilation mechanism of the above-mentioned pull-up pants relies on mechanical pressure to trigger. When the user is in a supine or static position, the gas convection efficiency is reduced, and a continuous air circulation system cannot be formed, resulting in the humid and hot environment being maintained for too long. Summary of the invention

[0005] In view of the technical defects existing in the background technology, the present invention proposes a manufacturing process of a wearable absorbent product with breathing and ventilation function, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows: A manufacturing process of a wearable absorbent product with breathing and ventilation function comprises the following steps: S1, conveying the water-repellent nonwoven fabric to a punching device, processing a micropore array with a pore size of 1.0-5.0 mm on the surface of the water-repellent nonwoven fabric, maintaining a center distance of 3-11 mm between adjacent micropores, and obtaining a punched layer with a plurality of absorption holes on the surface, wherein the opening rate of the punched layer is 50-80%; S2. Transfer the hydrophilic non-woven fabric and the water-repellent non-woven fabric of the perforated layer to the laminating equipment for lamination together. Through the cooperation of the upper laminating roller and the lower laminating roller of the laminating equipment, perform thermal lamination fixation or ultrasonic dot rolling fixation to form lamination points between adjacent absorption holes 13. The characteristic size of a single said lamination point is 0.5 - 2.0 mm, and the distance between adjacent said lamination points is 1.0 - 5.0 mm, so that the hydrophilic non-woven fabric and the perforated layer achieve local melting adhesion through the lamination points to form an isolation layer. The composite thickness at the lamination points is 50 - 80% of the non-laminated area; S3. Prepare an absorbent core. Overlap multiple absorbent cores in sequence and laminate them through an adhesive to form an absorbent body. Wrap a layer of covering non-woven fabric on the outer surface of the absorbent body to obtain the absorbent core. The surface of the prepared absorbent core 3 has breathable grooves, and a breathable diversion groove is formed at the surface lamination section of the absorbent core; S3. Prepare a composite bottom layer; S4. Laminate the isolation layer, the diversion layer, the absorbent core, and the composite bottom layer in sequence. The two long sides of the lower surface of the absorbent core are adhesively bonded to the corresponding areas below it, and the composite bottom layer bends downward under the absorbent core to form a ventilation space under the absorbent core, obtaining an absorbent product with a breathing and ventilation function.

[0006] As a further technical solution of the present invention, in step S2, a plurality of lamination protrusions are provided on the surface of the upper laminating roller. The lamination protrusions are arranged at equal intervals along the circumferential direction of the upper laminating roller, and the adjacent columns of the lamination protrusions are staggered along the axial direction of the upper laminating roller. The height of the lamination protrusions is 0.5 - 30 mm.

[0007] As a further technical solution of the present invention, in step S2, the number of lamination points between adjacent absorption holes is one or more, and the number of lamination points on the surface of the perforated layer is 1.0 - 10 times the number of absorption holes.

[0008] As a further technical solution of the present invention, in step S2, the perforated layer and the hydrophilic non-woven fabric are fed synchronously between the upper laminating roller and the lower laminating roller after being aligned by a tension adjusting device for thermal lamination or ultrasonic lamination. The wetting angle of the surface of the hydrophilic non-woven fabric ≤ 30°. The lamination temperature of the upper laminating roller is 80 - 200 °C, the lower laminating roller is a smooth roller, the thermal lamination temperature is 80 - 200 °C, the linear pressure applied by the upper laminating roller is 20 - 30 N / mm, the composite speed is 10 - 50 m / min, and the residence time is 0.06 - 0.18 s.

[0009] As a further technical solution of the present invention, the basis weight of the perforated layer is 12 - 18 g / m 2 of the water-repellent non-woven fabric, and the composite bottom layer is 10 - 30 g / m 2 of the hydrophilic non-woven fabric.

[0010] As a further technical solution of the present invention, in step S3, high molecular water-absorbing resin is provided in the corresponding regions of the first absorbent core, the second absorbent core, and the third absorbent core in the absorption section of the absorbent body. The first absorbent core, the second absorbent core, and the third absorbent core are adhesively bonded and compounded through an adhesive in the corresponding regions of the pressing section of the absorbent body between the absorbent cores. The pressing section forms a diversion groove on the surface of the absorbent body. A gas channel is formed by a gap between the first absorbent core and the second absorbent core, and the gas channel extends along the length direction of the absorbent body.

[0011] As a further technical solution of the present invention, the thickness of the second absorbent core is 1-3 times that of the first absorbent core, the high molecular water-absorbing resin provided in the second absorbent core is 1-2 times that of the first absorbent core, the thickness of the third absorbent core is 1-3 times that of the second absorbent core, and the high molecular water-absorbing resin provided in the third absorbent core is 1-2 times that of the second absorbent core.

[0012] As a further technical solution of the present invention, in step S4, the secondary non-woven fabric, the super breathable bottom film, and the bottom non-woven fabric are compounded to obtain a first composite bottom layer, and the inner lining non-woven fabric, the waist elastic band, and the outer lining non-woven fabric are compounded to obtain a second composite bottom layer. The super breathable bottom film is selected from any one of a super breathable PE film or a polytetrafluoroethylene film, and the air permeability of the super breathable film layer is 2500-4000g / m 2 / 4h.

[0013] The beneficial effects of the present invention are as follows: The synergistic effect of the water-repellent perforated layer and the hydrophilic composite bottom layer forms an absorption gradient. The press-fit protrusions staggered on the surface of the perforated layer achieve local melting adhesion between the perforated layer and the composite bottom layer. The water-repellent layer quickly absorbs urine through the absorption hole array, while the hydrophilic layer accelerates liquid conduction, enabling the absorbent product to quickly absorb while keeping the surface dry. The absorbent core of the absorbent body adopts a gradient structure with gradually increasing thickness layer by layer and doubling the content of high molecular water-absorbing resin, achieving a total absorption capacity and a low rewet rate. Through the ventilation cavity formed by the bending of the bottom layer and in cooperation with the air permeability of the super breathable PE film, an air convection channel is constructed, enabling the hot and humid gas generated inside the absorbent product to be discharged through the bottom layer. Description of the Drawings

[0014] Figure 1 It is a process flow chart of the present invention.

[0015] Figure 2 It is one of the internal structure schematic diagrams of the disposable diaper prepared by the present invention.

[0016] Figure 3 It is another internal structure schematic diagram of the disposable diaper prepared by the present invention.

[0017] Figure 4This is a schematic diagram of the internal structure of the pull-up pants prepared by the present invention.

[0018] Figure 5 It is a schematic diagram of the structure of the isolation layer prepared according to the present invention.

[0019] Figure markings: 1-isolation layer; 11-perforated layer; 12-composite layer; 13-absorption holes; 14-pressing point; 2-guiding layer; 3-absorption core; 31-guiding groove; 32-ventilation space; 33-coated non-woven fabric; 34-first absorption core; 35-second absorption core; 36-third absorption core; 37-gas channel; 38-absorption section; 39-pressing section; 4-composite bottom layer; 41-secondary non-woven fabric; 42-super breathable bottom film; 43-bottom layer non-woven fabric; 44-lining non-woven fabric; 45-waist elastic band; 46-outer lining non-woven fabric; 47-composite bottom layer one; 48-composite bottom layer two; 5-first leakproof partition edge; 51-first partition edge non-woven fabric; 53-leakproof membrane; 6-second leakproof partition edge; 61-second partition edge non-woven fabric; 62-second partition edge elastic band; 7-core elastic band. DETAILED DESCRIPTION

[0020] The implementation mode of the present invention is described below in conjunction with relevant embodiments. The implementation mode of the present invention is not limited to the following embodiments, and the present invention relates to relevant necessary components in the technical field, which should be regarded as the known technology in the technical field and can be known and mastered by the technical personnel in the technical field.

[0021] like Figures 1 to 5 As shown, a manufacturing process of a wearable absorbent product with breathing and ventilation function comprises the following steps: S1, conveying the water-repellent nonwoven fabric to a punching device, processing a micropore array with a pore size of 1.0-5.0 mm on the surface of the water-repellent nonwoven fabric, maintaining a center distance of 3-11 mm between adjacent micropores, and obtaining a perforated layer 11 with a plurality of absorption holes 13 on the surface, wherein the opening rate of the perforated layer 11 is 50-80%.

[0022] S2, conveying the hydrophilic nonwoven fabric and the water-repellent nonwoven fabric of the perforated layer 11 to a laminating device for compounding, and performing heat laminating through the cooperation of the upper laminating roller and the lower laminating roller of the laminating device to form a laminating point 14 between adjacent absorption holes 13, wherein the characteristic size of a single laminating point 14 is 0.5-2.0 mm, and the spacing between adjacent laminating points 14 is 1.0-5.0 mm, so that the hydrophilic nonwoven fabric and the perforated layer 11 are partially melt-bonded through the laminating points 14 to form an isolation layer 1, and the composite thickness at the laminating points 14 is 50-80% of the unlaminated area; S3. Prepare the absorbent core 3. Overlap multiple layers of absorbent cores in sequence and laminate them with an adhesive to form an absorbent body. Wrap a layer of covering non-woven fabric 33 on the outer surface of the absorbent body to obtain the absorbent core 3. The surface of the prepared absorbent core 3 has breathable grooves, and the surface pressing section 39 of the absorbent core 3 forms breathable diversion channels 31. S4. Prepare the composite bottom layer 4. S5. Laminate the isolation layer 1, the diversion layer 2, the absorbent core 3, and the composite bottom layer 4 in sequence. The two long sides of the lower surface of the absorbent core 3 are connected to the ultra-breathable bottom film 42, and the composite bottom layer 4 bends downward towards the absorbent core 3 to form a ventilation space 32 below the absorbent core 3, obtaining an absorbent product with a breathing and ventilation function.

[0023] Further, in the above manufacturing process, the basis weight of the perforated layer 11 is 12 - 18 g / m 2 of water-repellent non-woven fabric, and the composite layer 12 is 10 - 30 g / m 2 of hydrophilic non-woven fabric.

[0024] In the manufacturing process of the present invention, microhole arrays are formed by perforating the surface of the perforated layer 11 (water-repellent non-woven fabric), enabling urine to quickly penetrate downward through the absorption holes 13 to the diversion layer 2 and the absorbent core 3, reducing surface liquid residue. The absorbent core 3 is composed of a first absorbent core 34, a second absorbent core 35, and a third absorbent core 36. Among them, the absorption section 38 is provided with a superabsorbent polymer, and the pressing section 39 forms diversion channels 31, improving the liquid diffusion efficiency. The thickness of each layer and the content gradient of the superabsorbent polymer increase gradually to achieve hierarchical absorption of liquids, enhancing the total absorption capacity and reducing the amount of back leakage.

[0025] In the manufacturing process of the present invention, the isolation layer 1 is composed of the perforated layer 11 of water-repellent non-woven fabric and the composite layer 12 of hydrophilic non-woven fabric. The water-repellent property of the perforated layer 11 prevents liquid back leakage, while the wetting angle of the composite layer 12 ≤ 30°, which can quickly divert liquid to the lower layer to keep the surface dry. The perforated layer 11 and the composite layer 12 are locally melt-bonded through the pressing points 14, reducing liquid retention between layers and retaining the diversion ability of the non-pressed areas at the same time.

[0026] As one of the preferred embodiments of the present invention, in step S2, a plurality of pressing protrusions are provided on the surface of the upper pressing roller. The pressing protrusions are arranged at equal intervals along the circumferential direction of the upper pressing roller, and the pressing protrusions in adjacent columns are staggered along the axial direction of the upper pressing roller. The height of the pressing protrusions is 0.5 - 30 mm.

[0027] During the hot pressing or ultrasonic pressing process, the pressing protrusions come into contact with the perforated layer 11 and the hydrophilic non-woven fabric, and pressure and heat are applied to locally melt the materials at the contact parts, forming pressing points 14 with a characteristic size of 0.5 - 2.0 mm. The formation of the pressing points 14 firmly bonds the perforated layer 11 and the hydrophilic non-woven fabric at specific positions, improving the overall strength of the isolation layer 1 and preventing delamination or detachment during use.

[0028] The pressing protrusions are arranged at equal intervals along the circumferential direction, and adjacent columns are staggered along the axial direction, ensuring the uniform distribution of the pressing points 14 on the surface of the perforated layer 11. At the same time, the non-pressed areas are retained, and the fiber fluffiness of the non-pressed areas is maintained, which is beneficial to the rapid diffusion of liquid in these areas, improving the absorption efficiency, reducing the residence time of the liquid on the surface, and keeping it dry. The thickness of the pressing points 14 is 50 - 80% of that of the non-pressed areas, which not only ensures sufficient bonding strength but also avoids excessive compression of the fibers and affects the absorption performance.

[0029] As one of the preferred embodiments of the present invention, in step S2, the number of pressing points 14 between adjacent absorption holes 13 is one or more, and the number of pressing points 14 on the surface of the perforated layer 11 is 1.0 - 10 times the number of absorption holes 13.

[0030] By setting an appropriate number of pressing points 14 between adjacent absorption holes 13 and controlling the number of pressing points 14 to be 1.0 - 10 times the number of absorption holes 13, the present invention realizes the effective composite of the perforated layer 11 and the hydrophilic non-woven fabric, enhances the bonding strength of the materials, and at the same time optimizes the liquid absorption and diversion performance, improving the dryness and comfort of the absorbent article.

[0031] The increase in the number of pressing points 14 enables the perforated layer 11 and the hydrophilic non-woven fabric to achieve local melting and bonding at more positions, improving the overall strength of the composite layer 12. The uniformly distributed pressing points 14 ensure that the stress distribution of the composite material is more uniform when stressed, reducing the risk of delamination or detachment. Since the number of pressing points 14 is 1.0 - 10 times the number of absorption holes 13, the non-pressed areas are still sufficient, and the fiber fluffiness is maintained, which is beneficial to the rapid diffusion of liquid in these areas. The fiber structure of the non-pressed areas remains intact, and the liquid can quickly penetrate downward along the gaps between the fibers to the absorbent core 3, reducing the surface wet feeling.

[0032] As one of the preferred embodiments of the present invention, in step S2, the perforated layer 11 and the hydrophilic non-woven fabric are synchronously fed between the upper pressing roller and the lower pressing roller after being aligned by a tension adjusting device for thermal pressing or ultrasonic pressing. The wetting angle of the surface of the hydrophilic non-woven fabric is ≤30°. The pressing temperature of the upper pressing roller is 80-200°C. The lower pressing roller is a smooth roller, and the thermal pressing temperature is 80-200°C. The linear pressure applied by the upper pressing roller is 20-30 N / mm, the compounding speed is 10-50 m / min, and the residence time is 0.01-0.2 s.

[0033] In step S2, the perforated layer 11 and the hydrophilic non-woven fabric are synchronously fed between the upper pressing roller and the lower pressing roller through a tension adjusting device for thermal pressing. The upper pressing roller applies an appropriate linear pressure and residence time to locally melt and bond the two layers of materials to form a separator layer 1 with good bonding strength and liquid diversion performance.

[0034] The tension adjusting device ensures that the perforated layer 11 and the hydrophilic non-woven fabric are aligned before being fed into the pressing roller, avoiding deviation during the thermal pressing process, ensuring the flatness and consistency of the composite material. The plasma treatment changes the surface characteristics of the hydrophilic non-woven fabric, making it more hydrophilic, which helps the liquid to be quickly absorbed and diverted, improving the absorption speed and dryness of the absorbent article.

[0035] The temperature range of 80-200°C enables the perforated layer 11 and the hydrophilic non-woven fabric to reach an appropriate molten state during the thermal pressing process, which is beneficial to the bonding of the two layers of materials. The upper pressing roller applies a linear pressure of 20-30 N / mm and a residence time of 0.8-1.2 s. The precisely controlled pressure and time ensure that the materials are fully melted and cured at the pressing point 14 to form a stable bond, while avoiding material damage caused by overheating or excessive pressure.

[0036] As one of the preferred embodiments of the present invention, in step S3, high molecular water-absorbing resin is provided in the corresponding regions of the first absorbent core 34, the second absorbent core 35, and the third absorbent core 36 in the absorption section 38 of the absorbent body 3. The first absorbent core 34, the second absorbent core 35, and the third absorbent core 36 are adhesively bonded through the corresponding regions in the pressing section 39 of the absorbent body 3. The pressing section 39 forms a diversion groove 31 on the surface of the absorbent body 3. A gas channel 37 is formed by a gap between the first absorbent core 34 and the second absorbent core 35, and the gas channel 37 extends along the length direction of the absorbent body 3.

[0037] Further, in the above structure, the thickness of the second absorbent core 35 is 1-3 times that of the first absorbent core 34, the superabsorbent polymer resin provided in the second absorbent core 35 is 1-2 times that of the first absorbent core 34, the thickness of the third absorbent core 36 is 1-3 times that of the second absorbent core 35, and the superabsorbent polymer resin provided in the third absorbent core 36 is 1-2 times that of the second absorbent core 35.

[0038] Superabsorbent polymer resin is provided in the corresponding areas of the first absorbent core 34, the second absorbent core 35, and the third absorbent core 36 in the absorption section 38. Through the gradient structure of the thickness and the content of the superabsorbent polymer resin, the thickness of the second absorbent core 35 is 1-3 times that of the first absorbent core 34, the superabsorbent polymer resin provided in the second absorbent core 35 is 1-2 times that of the first absorbent core 34, the thickness of the third absorbent core 36 is 1-3 times that of the second absorbent core 35, and the superabsorbent polymer resin provided in the third absorbent core 36 is 1-2 times that of the second absorbent core 35, forming a gradually enhanced absorption capacity and achieving a hierarchical absorption effect of rapid interception, diffusion, and water locking.

[0039] The first absorbent core 34, the second absorbent core 35, and the third absorbent core 36 are compounded and bonded through an adhesive in the corresponding area of the pressing section 39. During the bonding process, a flow guiding groove 31 is formed by pressing. The flow guiding groove 31 can guide the liquid to diffusely spread in a direction on the surface of the absorbent core body 3, avoiding local saturation, improving the absorption uniformity. The multi-layer absorbent cores are fixed by bonding in the pressing section 39 to prevent the displacement or looseness between the core layers. The gap between the first absorbent core 34 and the second absorbent core 35 forms a gas channel 37 extending along the length direction of the absorbent core body 3, allowing the longitudinal flow of the humid and hot gas. Combining with the ventilation space 32, it enhances the gas exchange between the inside and the outside of the absorbent product and reduces the stuffy feeling.

[0040] As one of the preferred embodiments of the present invention, in step S4, the secondary non-woven fabric 41, the super breathable bottom film 42, and the bottom non-woven fabric 43 are compounded to obtain a composite bottom layer one 47, and the inner liner non-woven fabric 44, the waist elastic 45, and the outer liner non-woven fabric 46 are compounded to obtain a composite bottom layer two 48. The super breathable bottom film 42 is selected from any one of the super breathable PE film or the polytetrafluoroethylene film, and the air permeability of the super breathable film layer is 2500-4000g / m 2 / 4h.

[0041] As Figure 3 and Figure 4 shown, in the manufacturing process of the present invention, the isolation layer 1, the flow guiding layer 2, the absorbent core body 3, and the composite bottom layer one 47 are compounded in sequence to prepare the corresponding diaper product.

[0042] In the above diaper structure, the first composite bottom layer 47 is composed of a secondary non-woven fabric 41, a highly breathable bottom film 42, and a bottom non-woven fabric 43. The high moisture permeability rate of the highly breathable bottom film 42 accelerates the discharge of hot and humid air. The two long sides of the lower surface of the absorbent core 3 are connected to the highly breathable bottom film 42. The first composite bottom layer 47 bends downward to form an arched ventilation space 32, allowing air to flow under the absorbent core 3 and reducing the accumulation of heat and humidity.

[0043] In the above diaper structure, through the ventilation space 32 formed between the absorbent core 3 and the first composite bottom layer 47, combined with the high moisture permeability of the highly breathable bottom film 42, a "breathing channel" is formed. The hot and humid gas diffuses inside through the ventilation space 32 and is discharged outside the diaper through the highly breathable bottom film 42. The gap between the first absorbent core 34 and the second absorbent core 35 forms a gas channel 37, which extends along the length direction of the absorbent core 3, promoting the longitudinal flow of the hot and humid gas and enhancing the ventilation efficiency.

[0044] In the above diaper structure, the highly breathable bottom film is selected from any one of a highly breathable PE film or a polytetrafluoroethylene film, and the air permeability of the highly breathable film layer is 2500 - 4000g / m 2 / 4h.

[0045] The highly breathable bottom film 42 is selected from a highly breathable PE film or a polytetrafluoroethylene film, with an air permeability of 2500 - 4000g / m 2 / 4h, having good waterproof and breathable performance, effectively blocking the passage of liquids and particles, while allowing water vapor to pass through, achieving the effect of "waterproof and breathable". The high moisture permeability rate of the highly breathable bottom film 42 helps to maintain the air pressure balance inside and outside the diaper, preventing stuffiness and discomfort.

[0046] As a further supplement to the above diaper structure, the above diaper further includes a second leak-proof border 6 and a first leak-proof border 5 symmetrically arranged on both sides of the absorbent core 3, and the second border 6 is arranged inside the first border 5.

[0047] The first leak-proof borders 5 on both sides of the absorbent core 3 are respectively formed by folding a leak-proof film 53 and a first border non-woven fabric 51. The leak-proof film 53 is arranged between the two first border non-woven fabrics formed by folding. The corresponding double-layer first border non-woven fabric 51 and the leak-proof film 53 formed by folding are folded inward and outward of the absorbent core 3 on one side of the absorbent core 3 in sequence to form a single-sided first leak-proof border 5. A first composite bottom layer 47 is arranged under the absorbent core 3. The lower end of the first leak-proof border 5 extends outward of the absorbent core 3 and is bonded to the bottom layer 4. A first border elastic band 51 is laminated between the two first border non-woven fabrics at the upper end of the first leak-proof border 5.

[0048] On the inner side of the first leakage-proof border 5, a second leakage-proof border 6 that symmetrically wraps around both sides of the absorbent core 3 in a C shape is correspondingly arranged. The second leakage-proof border 6 includes a second border non-woven fabric 61 that is folded parallel in a C shape and a second border elastic 62 arranged between the second border non-woven fabrics 61 at the upper end of the second leakage-proof border 6. The second border non-woven fabric 61 on the outer side of the lower end of the second leakage-proof border 6 is bonded to the secondary non-woven fabric 41 at the positions below the two long sides of the lower surface of the absorbent core 3.

[0049] In the structure of the above-mentioned diaper, the unilateral first leakage-proof border 5 is formed by folding the first border non-woven fabric 51 in parallel, forming an effective leakage-proof barrier on both sides of the absorbent core 3. The lower end of the first leakage-proof border 5 extends outward from the absorbent core 3 and is bonded to the bottom layer 4, further strengthening the connection between the first leakage-proof border 5 and the bottom layer 4 and preventing urine from leaking from the side. The leakage-proof film 53 is selected from any one of the super-breathable PE film or the polytetrafluoroethylene film, and its air permeability is 2500 - 4000 g / m 2 / 4h. Through the high air permeability of the super-breathable bottom film 42 and the leakage-proof film 53, it helps to discharge the hot air generated by urine and keep the inside of the absorbent product dry.

[0050] The second leakage-proof border 6 symmetrically wraps around both sides of the absorbent core 3 in a C shape. Through the setting of the second border elastic 62, the second leakage-proof border 6 can better fit the legs of the user, improving the wearing comfort. The second border non-woven fabric 61 on the outer side of the lower end of the second leakage-proof border 6 is bonded to the secondary non-woven fabric 41 at the positions below the two long sides of the lower surface of the absorbent core 3. This design further strengthens the connection between the second leakage-proof border 6 and the bottom layer 4 and prevents urine from leaking from the side. The synergistic effect of the first leakage-proof border 5 and the second leakage-proof border 6 forms a double leakage-proof barrier, greatly improving the leakage-proof performance of the absorbent product.

[0051] As Figure 4 shown, in the manufacturing process of the present invention, the isolation layer 1, the diversion layer 2, the absorbent core 3, and the composite bottom layer two 48 are sequentially compounded to prepare the corresponding pull-up pants product.

[0052] A composite bottom layer two 48 is arranged outside the first border non-woven fabric 71 below the absorbent core 3. The composite bottom layer two 48 is formed by sequentially compounding an inner lining non-woven fabric 44 and an outer lining non-woven fabric 46. Waist elastics 45 are arranged at the waist positions at both ends of the absorbent product between the inner lining non-woven fabric 44 and the outer lining non-woven fabric 46, enabling the absorbent product to better fit the waist of the user and preventing urine from leaking from the waist. The elasticity of the waist elastics 45 can make the absorbent product maintain a stable fitting state during wearing, not easily slipping or shifting, and improving the wearing stability and comfort.

[0053] As a further structural supplement to the above-mentioned pull-up pants, the above-mentioned pull-up pants further include, on both sides of the absorbent core 3, a first leak-proof side edge 5. The first leak-proof side edge 5 is formed by integrally folding a single leak-proof film 53 and a first side-edge non-woven fabric 51 in a U shape, and then covering the bottom surface and both sides of the absorbent core 3. And it is formed by folding a second time upward from the absorbent core 3 to the outside of the absorbent core 3. After folding, the two ends of the leak-proof film 53 are placed inside the top end in the height direction of the first leak-proof side edge 5, and the two ends of the folded first side-edge non-woven fabric 51 are placed below the absorbent core 3. Between the two layers of the first side-edge non-woven fabric 51 at the upper end of the first leak-proof side edge 5 on one side of the absorbent core 3, a first side-edge rubber band 51 is laminated and compounded. The isolation layer 1 is wrapped in an inverted U shape outside the absorbent body formed by the floating core 3 and the diversion layer 2. The isolation layer 1 is folded toward the central axis direction of the floating core 3 at the upper position on both long sides of the floating core 3, and a U-shaped leak-proof structure is formed. A core rubber band 7 is provided between the two layers of the isolation layer 1 at the position of the U-shaped leak-proof structure and above the floating core.

[0054] The leak-proof film 53 in the structure of the pull-up pants is selected from any one of a super-breathable PE film or a polytetrafluoroethylene film, and the air permeability is 2500-4000g / m 2 / 4h.

[0055] In the structure of the above-mentioned pull-up pants, by contracting the core rubber band 7 and the first side-edge rubber band 52, an inner and outer U-shaped leak-proof structure can be formed on the absorbent product by the absorbent core 3 and the first leak-proof side edge 5 respectively. The inner small U-shaped structure formed on the absorbent core 3 by contracting the core rubber band 7 enables both sides of the absorbent core 3 to closely adhere to the baby's legs through the contraction of the core rubber band 7 without causing leg rubbing. By contracting the first side-edge rubber band 52, the first leak-proof side edge 5 can form an outer large U-shaped structure on the absorbent product, and increase the three-dimensionality of the first leak-proof side edge 5, thereby increasing the leak-proof performance of the pull-up pants.

[0056] The main function of the leak-proof film 53 is to prevent urine from leaking sideways and from the bottom. Through the material with good air permeability and water-blocking performance of the leak-proof film 53, it can effectively block the seepage of urine. The leak-proof film 53 and the ventilation space 32 below the absorbent core 3 jointly construct a "breathing channel", enabling the absorbent product to more effectively discharge hot air, improving air permeability, and thus providing a more comfortable use experience for users.

[0057] Example 1 Preparation parameters: Perforated layer 11: water-repellent non-woven fabric (gram weight 15g / m²), pore diameter 2.0mm, and aperture ratio 60%.

[0058] Composite layer 12: Hydrophilic non-woven fabric (grammage 10 g / m²), wetting angle ≤ 30°; lamination temperature 120 °C. Linear pressure 25 N / mm, residence time 0.1 s.

[0059] Absorbent core 3: First absorbent core 34 (thickness 0.3 mm, content of superabsorbent polymer 10 g / m²), second absorbent core 35 (thickness 0.6 mm, content of superabsorbent polymer 20 g / m²), third absorbent core 36 (thickness 1.2 mm, content of superabsorbent polymer 40 g / m²), width of gas channel 37 is 2.5 mm.

[0060] Leakage-preventing film 53 inside the first leakage-preventing border 5: Super breathable PE film (breathability 3000 g / m 2 / 4h).

[0061] Composite bottom layer 47: Super breathable PE film (breathability 3000 g / m 2 / 4h).

[0062] Example 2 Preparation parameters: Perforated layer 11: Water-repellent non-woven fabric (grammage 15 g / m²), pore diameter 2.0 mm, porosity 60%.

[0063] Composite layer 12: Hydrophilic non-woven fabric (grammage 10 g / m²), wetting angle of hydrophilic non-woven fabric ≤ 30°; lamination temperature 120 °C. Linear pressure 25 N / mm, residence time 0.1 s.

[0064] Absorbent core 3: First absorbent core 34 (thickness 0.3 mm, content of superabsorbent polymer 10 g / m²), second absorbent core 35 (thickness 0.6 mm, content of superabsorbent polymer 20 g / m²), third absorbent core 36 (thickness 1.2 mm, content of superabsorbent polymer 40 g / m²), width of gas channel 37 is 2.5 mm.

[0065] Leakage-preventing film 53 inside the first leakage-preventing border 5: Super breathable PE film (breathability 3000 g / m 2 / 4h).

[0066] Example 3 Preparation parameters: Perforated layer 11: Water-repellent non-woven fabric (grammage 18 g / m²), pore diameter 3.0 mm, porosity 70%.

[0067] Composite layer 12: Hydrophilic non-woven fabric (grammage 12 g / m²), wetting angle ≤ 25°; lamination temperature 150 °C, linear pressure 28 N / mm, residence time 0.1 s.

[0068] Absorbent core 3: The first absorbent core 34 (thickness 0.5 mm, superabsorbent polymer content 8 g / m²), the second absorbent core 35 (thickness 1.0 mm, superabsorbent polymer content 16 g / m²), the third absorbent core 36 (thickness 2.0 mm, superabsorbent polymer content 32 g / m²), and the width of the gas channel 37 is 2.5 mm.

[0069] Leakage prevention film 53 inside the first leakage prevention border 5: Super breathable PE film (breathability rate 3800 g / m 2 / 4h).

[0070] Composite bottom layer 1 47: Polytetrafluoroethylene film (breathability rate 3800 g / m 2 / 4h).

[0071] Comparative example 1 Preparation parameters: Perforated layer 11: Water-repellent non-woven fabric (grammage 12 g / m²), pore diameter 1.0 mm, and pore opening rate 50%.

[0072] Composite layer 12: Hydrophilic non-woven fabric (wetting angle ≤ 45°); lamination temperature 80 °C, linear pressure 20 N / mm, and residence time 0.1 s.

[0073] Absorbent core 3: Single-layer absorbent core (thickness 3.0 mm, superabsorbent polymer content 30 g / m²), without a gas channel.

[0074] Leakage prevention film 53 inside the first leakage prevention border 5: Super breathable PE film (breathability rate 800 g / m 2 / 4h).

[0075] Composite bottom layer 1 47: Ordinary PE film (breathability rate 800 g / m 2 / 4h).

[0076] According to the preparation parameters of the above Examples 1-3 and Comparative Example 1, and in accordance with S1-S5 of the manufacturing process steps, corresponding disposable diapers were prepared for Examples 1, 3, and Comparative Example 1, and a corresponding pull-up pants was prepared for Example 2. The first absorption speed, total absorption capacity, rewet amount, and breathability rate were respectively detected for Examples 1-3 and Comparative Example 1. Among them, the object for detecting the breathability rate of Examples 1 and 3 and Comparative Example 1 was the composite bottom layer 1 47 of the disposable diaper, and the object for detecting the breathability rate of Example 2 was the composite layer (the composite layer composed of the leakage prevention film 53, the first border non-woven fabric 51, and the composite bottom layer 2 48) below the absorbent core 3 of the pull-up pants. The detection results of the above Examples 1-3 and Comparative Example 1 are shown in the following table:

[0077] By comparing the above data, it can be seen that in terms of absorption performance, the gradient absorption core 3 (including the diversion groove 31 and the gas channel 37) of Examples 1-3 significantly improves the first absorption speed and total amount. In Comparative Example 1, since the absorption core 3 is a single-layer structure, the absorption efficiency is low. In terms of the re-permeation amount, through the gradient distribution of the superabsorbent resin and the diversion groove 31 of the pressing section 39 in Examples 1-3, as well as the setting of the isolation layer 1, the reverse osmosis can be effectively reduced. In Comparative Example 1, due to the use of a conventional core structure, the low punching rate and poor hydrophilicity of the isolation layer, the reverse osmosis is relatively high. In terms of air permeability, the composite bottom layer 1 47 (the porosity ≥ 60% + super breathable film) of Examples 1 and 3 has an air permeability ≥ 2400g / m 2 / 4h, which is significantly better than that of Comparative Example 1 (ordinary film). Although the detection object of Example 2 is the composite layer composed of the leak-proof film 53, the first side non-woven fabric 51 and the composite bottom layer 2 48 in the pull-up pants structure, compared with Example 1, the air permeability difference is not large, and the good air permeability of the internal ventilation space 32 of the pull-up pants can still be maintained.

[0078] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A manufacturing process for a wearable absorbent product with a breathing and ventilation function, characterized in that: The following steps are involved: S1, conveying the water-repellent nonwoven fabric to a punching device, processing a micropore array with a pore size of 1.0-5.0 mm on the surface of the water-repellent nonwoven fabric, and maintaining a center distance of 3-11 mm between adjacent micropores, to obtain a punched layer (11) having a plurality of absorption holes (13) on the surface, wherein the opening rate of the punched layer (11) is 50-80%; S2, selecting a hydrophilic non-woven fabric as the composite layer (12), transferring the hydrophilic non-woven fabric and the water-repellent non-woven fabric of the perforated layer (11) to a laminating device for lamination, and performing heat lamination or ultrasonic point-shaped rolling and fixing by the cooperation of an upper laminating roller and a lower laminating roller of the laminating device, forming a laminating point (14) between adjacent absorption holes (13), wherein the characteristic size of a single laminating point (14) is 0.5-2.0 mm, and the spacing between adjacent laminating points (14) is 1.0-5.0 mm, so that the hydrophilic non-woven fabric and the perforated layer (11) are locally melt-bonded through the laminating point (14), thereby forming an isolation layer (1), and the composite thickness at the laminating point (14) is 50-80% of the unlaminated area; S3, preparing an absorbent core (3), overlapping multiple layers of absorbent cores in sequence and compounding them with an adhesive to form an absorbent, wrapping a layer of a coating non-woven fabric (33) on the outer surface of the absorbent to obtain an absorbent core (3), wherein the surface of the absorbent core (3) has breathable grooves, and the surface pressing section (39) of the absorbent core (3) forms a breathable guide groove (31); S4, preparing a composite bottom layer (4); S5, the isolation layer (1), the guide layer (2), the absorbent core (3), and the composite bottom layer (4) are sequentially composited, the two long sides of the lower surface of the absorbent core (3) are partially bonded to the corresponding area below it, and the composite bottom layer (4) is bent toward the bottom of the absorbent core (3), and a ventilation space (32) is formed below the absorbent core (3), thereby obtaining an absorbent product with a breathing and ventilation function.

2. A manufacturing process for a wearable absorbent product with a breathing and ventilation function according to claim 1, characterized in that: In step S2, a plurality of pressing protrusions are provided on the surface of the upper pressing roller, the pressing protrusions are arranged at equal intervals along the circumference of the upper pressing roller, the pressing protrusions in adjacent rows are staggered along the axial direction of the upper pressing roller, and the height of the pressing protrusions is 0.5-30 mm.

3. The manufacturing process of a wearable absorbent product with breathing and ventilation function according to claim 1, characterized in that: In step S2, the number of pressing points (14) between adjacent absorption holes (13) is one or more, and the number of pressing points (14) on the surface of the perforated layer (11) is 1.0-10 times the number of absorption holes (13).

4. The manufacturing process of a wearable absorbent product with breathing and ventilation function according to claim 1, characterized in that: In step S2, the perforated layer (11) and the hydrophilic non-woven fabric are simultaneously sent to an upper pressing roller and a lower pressing roller for heat pressing or ultrasonic pressing after passing through a tension adjusting device. The surface wetting angle of the hydrophilic non-woven fabric is ≤30°. The pressing temperature of the upper pressing roller is 80-200°C. The lower pressing roller is a smooth roller with a heat pressing temperature of 80-200°C. The line pressure applied by the upper pressing roller is 20-30 N / mm, the compounding speed is 10-50 m / min, and the residence time is 0.06-0.18 s.

5. The manufacturing process of a wearable absorbent product with breathing and ventilation function according to claim 1, characterized in that: The perforated layer (11) has a gram weight of 12-18 g / m 2 The water-repellent nonwoven fabric has a composite layer (12) of 10-30 g / m 2 Hydrophilic non-woven fabric.

6. The manufacturing process of a wearable absorbent product with breathing and ventilation function according to claim 1, characterized in that: In step S3, a high molecular water-absorbing resin is arranged on the first absorption core (34), the second absorption core (35), and the third absorption core (36) in the corresponding area of ​​the absorption section (38) of the absorption core (3); the first absorption core (34), the second absorption core (35), and the third absorption core (36) are compositely bonded between the absorption core (3) in the corresponding area of ​​the pressing section (39) of the absorption core (3) by an adhesive; the pressing section (39) forms a guide groove (31) on the surface of the absorption core (3); a gas channel (37) is formed by a gap between the first absorption core (34) and the second absorption core (35); and the gas channel (37) extends along the length direction of the absorption core (3).

7. A manufacturing process for a wearable absorbent product with a breathing and ventilation function according to claim 6, characterized in that: The thickness of the second absorption core (35) is 1-3 times the thickness of the first absorption core (34), the polymer water-absorbent resin arranged in the second absorption core (35) is 1-2 times that of the first absorption core (34), the thickness of the third absorption core (36) is 1-3 times the thickness of the second absorption core (35), and the polymer water-absorbent resin arranged in the third absorption core (36) is 1-2 times that of the second absorption core (35).

8. The manufacturing process of a wearable absorbent product with breathing and ventilation function according to claim 1, characterized in that: In step S4, the secondary non-woven fabric (41), the super-breathable bottom film (42), and the bottom non-woven fabric (43) are compounded to obtain a composite bottom layer 1 (47), and the inner lining non-woven fabric (44), the waist elastic band (45), and the outer lining non-woven fabric (46) are compounded to obtain a composite bottom layer 2 (48), wherein the super-breathable bottom film (42) is selected from any one of a super-breathable PE film and a polytetrafluoroethylene film, and the air permeability of the super-breathable film layer is 2500-4000 g / m 2 / 4h.

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