Special radioactive ray prevention disposable diaper for baby and preparation process

Abstract

The invention relates to the technical field of baby products, and discloses a special radioactive ray prevention disposable diaper for babies, which comprises a diaper body consisting of a surface layer, an absorption core body and a bottom film which are sequentially stacked from top to bottom, and a radioactive ray prevention composite layer for shielding electromagnetic radiation is compounded between the absorption core body and the bottom film. The radiation-proof composite layer comprises a metal fiber blending layer, and the metal fiber blending layer is formed by weaving or knitting conductive metal fibers and yarns formed by blending non-conductive natural fibers or artificial fibers and used for forming a shielding structure capable of attenuating external electromagnetic waves in the diaper body. The radioactive ray preventing composite layer is integrated in the multi-layer structure of the diaper body and can be tightly attached to key areas, where gaps are likely to be generated, of traditional lead protection equipment such as the groin, the perineum and the hip of an infant, and the problem that protection fails due to the fact that the traditional lead protection equipment and the body of the infant are not well attached is solved.

Description

Technical Field

[0001] This invention relates to the field of medical and health products and radiation protection technology, specifically to a disposable radiation-proof diaper for infants and its manufacturing process. Background Technology

[0002] In modern medical diagnostic technology, X-ray imaging, including conventional X-ray radiography and computed tomography (CT), is widely used as an effective non-invasive method for observing the internal structures of the human body. It is an indispensable key component in clinical disease screening, diagnosis, and treatment efficacy evaluation. However, as a type of high-energy ionizing radiation, X-rays, while penetrating human tissues for imaging, also produce corresponding biological effects. Based on the fundamental principle of radiation protection optimization, minimizing the radiation dose received by patients while ensuring the quality of diagnostic information is a core principle that must be followed in all medical radiation practices. This principle is particularly important for infants and young children, as their body tissues and organs are still in a stage of rapid growth and development, with active cell division and renewal. Their cells and tissues are significantly more sensitive to ionizing radiation than adults, and unnecessary radiation exposure may pose potential long-term health risks to their growth and development.

[0003] To address the aforementioned radiation protection needs, existing technologies primarily provide protective equipment using high atomic number elements such as lead as the core material. Specifically, lead aprons, lead caps, and lead neck protectors, widely deployed in medical institutions, are the standard technical solutions for current radiation protection procedures. The design principle of this type of equipment lies in utilizing the high binding energy of the inner-shell electrons of lead atoms to efficiently absorb low- and medium-energy X-ray photons through the photoelectric effect, and attenuate high-energy photons through mechanisms such as Compton scattering, thereby significantly reducing the radiation dose penetrating the human body. The core objective of its design and manufacturing is to maximize radiation shielding efficiency; therefore, it typically uses lead rubber or lead composite sheets with considerable thickness and areal density to ensure that the preset lead equivalent protection level is achieved against X-rays within the specified energy range. For adults or cooperative pediatric patients, this robust, durable, and reusable protective equipment provides effective coverage and shielding for critical areas such as the torso and gonads, playing a crucial role in clinical practice over the past decades.

[0004] However, on the one hand, traditional lead protective gear completely ignores the unique ergonomic characteristics and physiological needs of infants and young children in its design philosophy. Its inherent rigidity, weight, and standardized size cannot form a tight and effective conformal fit to the small, soft, and complex contours of an infant's body, especially in key areas such as the groin, perineum, and buttocks. These areas are easily disrupted by the infant's unconscious movements, creating gaps or "blind spots" that lead to protective failure. Furthermore, the hard materials of such gear come into direct contact with the infant's delicate skin, causing severe discomfort and even the risk of pressure sores, leading to crying and restlessness. This not only seriously affects the smooth progress of the examination process and image quality, but its non-disposable nature also poses a hygiene risk of cross-infection in scenarios where excrement may contaminate the skin. On the other hand, the technological development of existing disposable baby diapers focuses entirely on the construction of a liquid management system. This involves a sophisticated combination of superabsorbent polymers and multiple layers of non-woven fabric to achieve rapid absorption, diversion, and retention of urine, while maintaining dryness, breathability, and comfort. The materials used, such as cellulose, polypropylene, and polyethylene, are all organic polymers with low atomic numbers. They are almost completely transparent to X-rays with energies of tens of thousands to hundreds of thousands of electron volts and do not have any practical attenuation capabilities. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a disposable anti-radiation diaper for infants and its manufacturing process, solving the problem of "poor performance" in the aforementioned background technologies.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a disposable anti-radiation diaper for infants, comprising: a diaper body consisting of a top layer, an absorbent core, and a bottom membrane stacked sequentially from top to bottom; an anti-radiation composite layer for shielding electromagnetic radiation is further disposed between the absorbent core and the bottom membrane; the anti-radiation composite layer contains a metal fiber blended layer, which is woven or knitted from yarn made of conductive metal fibers and non-conductive natural or synthetic fibers, thereby forming a shielding structure inside the diaper body capable of attenuating external electromagnetic waves.

[0009] Preferably, the radiation shielding composite layer comprises, from top to bottom:

[0010] The first base fabric layer serves as an inner protective layer adjacent to the absorbent core.

[0011] The second base fabric layer serves as an outer protective layer adjacent to the base film;

[0012] The metal fiber blended layer, as the core functional layer for achieving electromagnetic shielding, is sandwiched in the middle. The first base fabric layer, the metal fiber blended layer, and the second base fabric layer are tightly bonded together by hot melt adhesive or lamination process, forming a functional layer that combines shielding effectiveness, breathability, and structural stability.

[0013] Preferably, the metal fibers in the metal fiber blended layer are 316L stainless steel long fibers with a diameter ranging from 6 micrometers to 10 micrometers, and the natural fibers are combed organic cotton fibers. The blending ratio of the metal fibers and the natural fibers by weight is 25% to 35% of 316L stainless steel fibers and 65% to 75% of combed organic cotton fibers. The blended yarn made from the aforementioned blended fibers has a count of 35 to 45.

[0014] The metal fiber blended layer is woven using a plain weave process, with a warp density of 110 to 130 yarns / inch and a weft density of 70 to 90 yarns / inch, and the final fabric weight ranges from 100 to 120 grams per square meter.

[0015] Preferably, both the first and second base fabric layers are spunbond polypropylene nonwoven fabrics with a basis weight range of 12 to 18 g / m². Furthermore, the first base fabric layer, the metal fiber blended layer, and the second base fabric layer are hot-pressed together by a polyurethane-based hot melt adhesive web with a basis weight of 6 to 10 g / m². This web structure ensures interlayer peel strength while maximizing the moisture permeability of the entire radiation shielding composite layer.

[0016] Preferably, the absorbent core is a fully composite core structure without fluff pulp, comprising an upper layer of cleanroom paper and a lower layer of cleanroom paper, and a superabsorbent resin completely wrapped and fixed between the upper and lower layers of cleanroom paper. The total basis weight of the absorbent core is 400 to 500 grams per square meter, wherein the content of the superabsorbent resin accounts for more than 85% of the total weight of the absorbent core.

[0017] Preferably, the absorbent core is a fully composite core structure without fluff pulp, comprising an upper layer of cleanroom paper and a lower layer of cleanroom paper, and a superabsorbent resin completely wrapped and fixed between the upper and lower layers of cleanroom paper. The total basis weight of the absorbent core is 400 to 500 grams per square meter, wherein the content of the superabsorbent resin accounts for more than 85% of the total weight of the absorbent core.

[0018] Preferably, the surface layer is a hot-air nonwoven fabric with a weight range of 20 to 25 g / m², which is composed of bicomponent fibers with a fiber fineness of 1.8 to 2.2 denier. The surface of the surface layer is treated with a hydrophilic finishing agent to improve the liquid penetration rate, and the surface of the surface layer is also coated with microcapsule skin care ingredients containing aloe vera extract or vitamin E.

[0019] Preferably, a flow guiding layer is further provided between the surface layer and the absorbent core. The flow guiding layer is an air-laid nonwoven fabric with a basis weight range of 28 to 35 g / m². To enhance its liquid diffusion and conduction capabilities, the flow guiding layer is provided with through holes arranged in a matrix pattern. The pore diameter of the through holes is 1.2 to 1.8 mm, the pore spacing is 3.5 to 4.5 mm, and its porosity reaches 12% to 18%. The bottom membrane is a composite breathable bottom membrane, which is composed of a polyethylene cast microporous membrane with a basis weight of 15 to 20 g / m² and a spunbond nonwoven fabric with a basis weight of 13 to 17 g / m² bonded together by hot melt adhesive. The water vapor permeability of the bottom membrane (14) is not less than 5000 g / m² / 24 hours.

[0020] Preferably, the diaper body is also provided with a waistband and leg guards. The waistband is a wrap-around, highly elastic waistband with an SMMMS composite nonwoven fabric as its base material. It has 10 to 14 spandex filaments with a stretch ratio of 2.8 to 3.2 evenly distributed in the transverse direction inside. The leg guards are double-layer three-dimensional guard structures made of spunbond nonwoven fabric that has been treated with water repellency. Each layer of the guard has 2 to 3 spandex filaments to form a leak-proof barrier at the base of the baby's thighs.

[0021] Preferably, the manufacturing process of disposable radiation-proof diapers for infants includes the following steps:

[0022] Step 1: Preparation of the radiation shielding composite layer. Metal fibers are blended with natural or synthetic fibers at a weight ratio of 25% to 35% and 65% to 75% to form 35-45 count yarns. The yarns are then woven using a plain weave process with a warp density of 110 to 130 yarns / inch and a weft density of 70 to 90 yarns / inch to form a metal fiber blended layer with a basis weight of 100 to 120 g / m². Spunbond polypropylene nonwoven fabric with a basis weight of 12 to 18 g / m² is laid on the upper and lower surfaces of the metal fiber blended layer as the first and second base fabric layers, respectively. The layers are then hot-pressed together with a polyurethane-based hot melt adhesive web film with a basis weight of 6 to 10 g / m² to form the radiation shielding composite layer.

[0023] Step 2: Preparation of absorbent core. Highly absorbent resin is laid in a regional density distribution between the upper and lower cleanroom paper. The amount of highly absorbent resin per unit area in the front and middle regions is 15% to 25% higher than that in the rear regions. After wrapping and fixing, a fully composite core structure with a total weight of 400 to 500 grams per square meter is formed.

[0024] Step 3: Surface pretreatment. The bicomponent fiber hot air nonwoven fabric with a weight of 20 to 25 grams per square meter is treated with a hydrophilic finishing agent and coated with microcapsule skin care ingredients containing aloe vera extract or vitamin E.

[0025] Step 4: Processing the flow guide layer. Process through holes arranged in a matrix on an air-laid nonwoven fabric with a basis weight of 28 to 35 g / m². The diameter of the through holes is 1.2 to 1.8 mm and the spacing between the holes is 3.5 to 4.5 mm. Control the opening rate to 12% to 18%.

[0026] Step 5: Base film lamination. A composite breathable base film is formed by laminating a polyethylene cast microporous membrane with a basis weight of 15 to 20 g / m² with a spunbond nonwoven fabric with a basis weight of 13 to 17 g / m² using hot melt adhesive.

[0027] Step Six: Composite molding of the main body. The surface layer, the flow guiding layer, the absorbent core, the anti-radiation composite layer, and the bottom film are stacked from top to bottom and laminated into the main body of the diaper through a lamination process.

[0028] Step 7: Install the waistband and leg guards. Attach a wraparound, highly elastic waistband made of SMMMS composite nonwoven fabric and 10 to 14 spandex filaments with a stretch ratio of 2.8 to 3.2 to the edge of the diaper body. Install double-layer water-repellent spunbond nonwoven fabric leg guards at the leg area, with 2 to 3 spandex filaments in each layer.

[0029] (III) Beneficial Effects

[0030] This invention provides a disposable radiation-proof diaper for infants and its manufacturing process. It has the following beneficial effects:

[0031] (1) When used, this baby-specific radiation-proof disposable diaper and its manufacturing process integrate the radiation-proof composite layer into the multi-layered structure of the diaper body, allowing it to closely fit key areas such as the groin, perineum, and buttocks of infants and young children, where gaps are easily created by traditional lead protective equipment. Furthermore, the diaper's shape is designed to conform to the ergonomic characteristics of infants and young children, maintaining effective coverage as they move, avoiding protective "blind spots" caused by unconscious restlessness, and solving the problem of insufficient fit between traditional lead protective equipment and the infant's body leading to protective failure.

[0032] (2) When used, this baby-specific radiation-proof disposable diaper and its manufacturing process achieve electromagnetic radiation shielding through a metal fiber network while maintaining a soft touch and good breathability. The hydrophilic treatment and skin-care ingredients on the surface further protect delicate skin, avoiding the discomfort or pressure sores caused by the rigid material of traditional lead protective equipment, and reducing the interference of infants' crying and restlessness on the examination process.

[0033] (3) When using this baby-specific radiation-proof disposable diaper and its manufacturing process, it retains the core functions of traditional disposable diapers such as absorption, leak prevention, and breathability, while adding radiation protection. The product is designed for single use, which can avoid the risk of cross-infection in excrement-contaminated scenarios of traditional reusable lead protective equipment; at the same time, its material selection and structural design do not sacrifice liquid management performance, realizing the integration of "protection + care" and meeting the multiple needs of infant and toddler medical scenarios. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is a schematic diagram showing the specific material distribution of the diaper body of the present invention;

[0036] Figure 3 This is a schematic diagram of the internal material distribution of the radiation-shielding composite layer of the present invention.

[0037] In the diagram: 1. Diaper body; 2. Waistband; 3. Leg guards; 10. Top layer; 11. Diversion layer; 12. Absorbent core; 13. Anti-radiation composite layer; 14. Bottom film; 131. First base fabric layer; 132. Metal fiber blended layer; 133. Second base fabric layer. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1 - Figure 3 This invention provides a disposable radiation-proof diaper specifically designed for infants. While providing regular absorption and leak-proof functions, it also effectively shields against electromagnetic radiation of specific frequencies in the environment, thus offering more comprehensive protection for the healthy growth of infants. The overall structure of the diaper mainly includes a diaper body 1, a waistband 2, leg guards 3, and Velcro 4 for fixing and adjusting, all mounted on the diaper body 1.

[0040] Specifically, the diaper body 1 is a multi-layered composite structure, formed by stacking layers sequentially from top to bottom, from the side in contact with the baby's skin to the outermost layer. The multi-layered composite structure includes a surface layer 10, a flow-guiding layer 11, an absorbent core 12, a radiation-shielding composite layer 13, and a bottom film 14. These functional layers are tightly bonded into an organic whole through specific processes, such as hot melt adhesive spraying or ultrasonic welding, to jointly achieve the product's intended function.

[0041] Furthermore, the surface layer 10 is the layer that comes into direct contact with the baby's skin, and its material, structure, and surface treatment are crucial for ensuring wearing comfort and keeping the skin dry. In one specific embodiment, the surface layer 10 is made of a hot-air nonwoven fabric with a basis weight of 22 g / m². This hot-air nonwoven fabric is composed of bicomponent fibers with a fiber fineness of 2.0 denier. The hot-air penetration technology used in its production process gives the fabric excellent fluffiness and softness, thus providing a superior tactile experience to the skin. To improve the rate of liquid penetration and prevent backflow, the surface of the hot-air nonwoven fabric is treated with a hydrophilic coating.

[0042] Specifically, a hydrophilic finishing agent, such as a polyoxyethylene fatty alcohol ether surfactant, is applied on the nonwoven fabric production line through padding or spraying. The amount applied is controlled between 0.3% and 0.5% of the dry weight of the finished fabric. Furthermore, to protect the delicate skin of babies, the surface of the outer layer 10 can also be coated with natural skin care ingredients, such as aloe vera extract or vitamin E. These ingredients are evenly adhered to the fiber surface using microencapsulation technology and slowly released during wear, providing moisturizing and anti-allergic effects.

[0043] Immediately below the surface layer 10 is the flow-guiding layer 11. The core function of the flow-guiding layer 11 is to quickly receive urine permeating from the surface layer 10 and rapidly diffuse it in a planar direction, thereby guiding the urine to be evenly distributed to the absorbent core 12 below, avoiding decreased absorption efficiency and the risk of side leakage due to localized oversaturation. In a specific embodiment, the flow-guiding layer 11 uses a basis weight of 30 g / m³. 2 This air-laid nonwoven fabric, also composed of ES fibers, features a more three-dimensional and looser mesh structure. To enhance its conductivity, the nonwoven fabric has regularly arranged through-holes with a pore diameter of 1.5 mm and a spacing of 4.0 mm, resulting in an open area ratio of approximately 15%. This structure not only enables rapid liquid conduction via capillary effect but also provides low-resistance vertical permeation channels for the liquid, achieving a liquid absorption time of less than 2 seconds under standard testing conditions.

[0044] Below the flow-guiding layer 11 is the absorbent core 12, which bears the core absorption function. The structural design and material selection of the absorbent core 12 directly determine the diaper's total absorption capacity, absorption speed, and water-locking ability. The absorbent core 12 adopts a fully composite core structure without fluff pulp. Compared with the traditional fluff pulp mixed core, this structure has the advantages of being thinner, less prone to breakage, and less prone to clumping. This composite core is specifically composed of two layers of dust-free paper wrapping a superabsorbent polymer (SAP) in the middle. The selected SAP is SA60N type sodium acrylate polymer produced by Sumitomo Chemical Co., Ltd. of Japan, with a particle size distribution between 300 and 600 micrometers, and a saturation absorption rate of no less than 35 g / g for 0.9% physiological saline. The total weight of the absorbent core 12 is designed to be 450 g / m³. 2 The content of SAP is as high as 90% or more of the total weight.

[0045] To further optimize absorbency, the SAP (Super Absorbent Polymer) is not distributed uniformly within the diaper core. Instead, its density is designed in zones based on the physiological urination characteristics of infants. Specifically, in the front-middle area of ​​the diaper, the SAP density per unit area is approximately 20% higher than in the rear area, creating a highly absorbent zone to address the issue of urine pooling when male infants urinate further forward or when infants are prone. The cleanroom paper wrapping the SAP is made from wood pulp fibers using air-laid technology, with a basis weight of 45 g / m². 2 It not only serves to fix SAP particles and prevent them from moving, but also has a certain liquid guiding and temporary storage capacity.

[0046] Next, we need to explain the radiation-shielding composite layer 13 located between the absorbent core 12 and the bottom membrane 14. Its main function is to effectively shield and attenuate medium- and high-frequency electromagnetic radiation from the external environment without affecting the basic physical properties of the diaper, such as breathability and softness. The radiation-shielding composite layer 13 itself is also a three-layer composite structure, which includes, from top to bottom, a first base fabric layer 131, a metal fiber blended layer 132, and a second base fabric layer 133.

[0047] Specifically, the first base fabric layer 131 and the second base fabric layer 133 serve to encapsulate and protect the intermediate functional layer, while providing the necessary mechanical strength and structural stability for the entire composite layer. In one specific embodiment, both the first base fabric layer 131 and the second base fabric layer 133 are selected with a basis weight of 15 g / m². 2 The spunbond polypropylene nonwoven fabric has good tensile strength and softness, and its porous fiber structure ensures good breathability, avoiding a significant decrease in the overall breathability of the diaper due to the addition of a radiation shield layer.

[0048] The core functional layer located in the middle is the metal fiber blended layer 132. The material composition and structure of this layer are key to achieving the electromagnetic shielding function. In a preferred embodiment of the invention, the metal fiber blended layer 132 is woven from yarn made of a blend of metal fibers and natural fibers. The selected metal fibers are 316L stainless steel long fibers with a diameter of 8 micrometers. This material has excellent conductivity and corrosion resistance, making it an ideal medium for achieving electromagnetic shielding. To ensure the softness, skin-friendliness, and moisture-wicking breathability of the fabric, the stainless steel fibers are not used alone, but are blended with natural organic cotton fibers.

[0049] The specific blending ratio is 30% by weight of 316L stainless steel fiber and 70% by weight of combed organic cotton fiber. These fibers undergo thorough opening and blending processes before spinning to produce a 40-count (Ne) blended yarn. Subsequently, this blended yarn is woven using a plain weave process into a thin fabric with a density of 120 warp ends / inch and 80 weft ends / inch, resulting in a final weight of approximately 110 g / m². 2 This continuous conductive network, formed by conductive metal fibers within the fabric, can reflect and absorb electromagnetic waves within a specific frequency range based on the Faraday cage principle, thereby achieving a shielding effect.

[0050] The first base fabric layer 131, the metal fiber blended layer 132, and the second base fabric layer 133 are laminated together with an extremely thin hot melt adhesive web. The selected hot melt adhesive is a polyurethane-based hot melt adhesive web with a basis weight of only 8 g / m². 2 The melting point is approximately 110 degrees Celsius. During lamination, a hot press roller is used for lamination, with pressure controlled at 0.2 MPa, temperature controlled at 125 degrees Celsius, and linear speed at 50 meters per minute. Using a web-like membrane instead of full-coat adhesive maximizes the breathability of the metal fiber blend layer 132 and the base fabric layer, ensuring that the moisture permeability of the entire radiation-shielding composite layer 13 is not less than 5000 g / m². 2 / 24h.

[0051] Finally, the outermost layer of the entire diaper structure is the bottom membrane 14. The main function of the bottom membrane 14 is to prevent urine leakage, while also possessing good breathability to expel warm, humid air from inside the diaper and keep the baby's bottom dry. In a preferred embodiment of the invention, the bottom membrane 14 is a composite breathable bottom membrane, consisting of a single 18g / m² layer. 2 polyethylene cast microporous membrane with a 15g / m 2 The spunbond nonwoven fabric is laminated with hot melt adhesive. Calcium carbonate particles are added during the production process of this PE microporous membrane, forming hundreds of millions of micron-sized pores during film stretching. These pores allow only water vapor molecules to pass through, while preventing liquid water molecules from permeating, achieving a water vapor permeability as high as 6000 g / m³. 2 / 24h. The outer non-woven fabric provides a soft, fabric-like feel and can be printed with patterns.

[0052] Surrounding the diaper body 1 are elastic structures such as the waistband 2 and leg guards 3 to ensure a dynamic fit between the diaper and the baby's body, effectively preventing side and back leaks. The waistband 2 features a wraparound, highly elastic design, with its base material being SMMMS (spunbond-meltblown-meltblown-meltblown-spunbond) composite nonwoven fabric. Internally, it is laminated with 12 560dtex spandex filaments evenly distributed along the waistband's transverse direction. The spandex filaments are pre-stretched before lamination, with a stretch ratio of 3.0, thus providing the waistband with durable and gentle resilience. The leg guards 3 employ a double-layer, three-dimensional structure made of water-repellent spunbond nonwoven fabric. Each layer contains two 420dtex spandex filaments to form a soft leak-proof barrier at the baby's groin. The Velcro 4 used for securing the baby features a rounded corner design to prevent sharp corners from scratching the baby's skin. Its textured side utilizes the non-woven fabric of the outer layer of the base film to provide reliable repeated adhesion performance, with a normal peel force of not less than 1.5 Newtons / cm.

[0053] This invention also provides a manufacturing process for a disposable radiation-proof diaper for infants, characterized by comprising the following steps:

[0054] Step 1: Preparation of the radiation shielding composite layer. Metal fibers are blended with natural or synthetic fibers at a weight ratio of 25% to 35% and 65% to 75% to form 35-45 count yarns. The yarns are then woven using a plain weave process with a warp density of 110 to 130 yarns / inch and a weft density of 70 to 90 yarns / inch to form a metal fiber blended layer with a basis weight of 100 to 120 g / m². Spunbond polypropylene nonwoven fabric with a basis weight of 12 to 18 g / m² is laid on the upper and lower surfaces of the metal fiber blended layer as the first and second base fabric layers, respectively. The layers are then hot-pressed together with a polyurethane-based hot melt adhesive web film with a basis weight of 6 to 10 g / m² to form the radiation shielding composite layer.

[0055] Step 2: Preparation of absorbent core. Highly absorbent resin is laid in a regional density distribution between the upper and lower cleanroom paper. The amount of highly absorbent resin per unit area in the front and middle regions is 15% to 25% higher than that in the rear regions. After wrapping and fixing, a fully composite core structure with a total weight of 400 to 500 grams per square meter is formed.

[0056] Step 3: Surface pretreatment. The bicomponent fiber hot air nonwoven fabric with a weight of 20 to 25 grams per square meter is treated with a hydrophilic finishing agent and coated with microcapsule skin care ingredients containing aloe vera extract or vitamin E.

[0057] Step 4: Processing the flow guide layer. Process through holes arranged in a matrix on an air-laid nonwoven fabric with a basis weight of 28 to 35 g / m². The diameter of the through holes is 1.2 to 1.8 mm and the spacing between the holes is 3.5 to 4.5 mm. Control the opening rate to 12% to 18%.

[0058] Step 5: Base film lamination. A composite breathable base film is formed by laminating a polyethylene cast microporous membrane with a basis weight of 15 to 20 g / m² with a spunbond nonwoven fabric with a basis weight of 13 to 17 g / m² using hot melt adhesive.

[0059] Step Six: Composite molding of the main body. The surface layer, the flow guiding layer, the absorbent core, the anti-radiation composite layer, and the bottom film are stacked from top to bottom and laminated into the main body of the diaper through a lamination process.

[0060] Step 7: Install the waistband and leg guards. Attach a wraparound, highly elastic waistband made of SMMMS composite nonwoven fabric and 10 to 14 spandex filaments with a stretch ratio of 2.8 to 3.2 to the edge of the diaper body. Install double-layer water-repellent spunbond nonwoven fabric leg guards at the leg area, with 2 to 3 spandex filaments in each layer.

[0061] Example 1: Production is carried out according to all parameters and processes of the preferred scheme in the above specific embodiments. Specifically:

[0062] Surface layer 10:22g / m 2 ES hot air nonwoven fabric, treated with 0.4% hydrophilic agent.

[0063] 11:30g / m 2 ES air-laid perforated nonwoven fabric.

[0064] Absorbent core 12: 450g / m 2 Fully composite core, containing 90% Sumitomo SA60N type SAP from Japan.

[0065] Radiation protection composite layer 13: composed of 15g / m 2 PP spunbond nonwoven fabric, 110g / m 2 (30% stainless steel fiber / 70% cotton) blended fabric, 15g / m 2 PP spunbond nonwoven fabric, passing 8g / m 2 It is made of TPU hot melt adhesive web composite.

[0066] Bottom film 14: 18g / m 2 PE microporous membrane with 15g / m 2 Non-woven fabric composite breathable bottom film with urine moisture indicator.

[0067] All other components (waistband, leg circumference, Velcro) are configured according to the aforementioned preferred specifications.

[0068] Production process: The aforementioned production method is adopted.

[0069] Comparative Example 1: For effective comparison, the structure and materials of Comparative Example 1 are essentially the same as those of Example 1, the only difference being the removal of the anti-radiation composite layer 13. To maintain the overall thickness and structural stability of the diaper, a single layer with a weight of 140 g / m² was used. 2 Ordinary air-laid nonwoven fabric (with a total weight equivalent to that of radiation shielding composite layer 13 in Example 1) replaced the original radiation shielding composite layer 13. The materials, specifications, parameters, and overall manufacturing process of all other layers were completely consistent with those of Example 1.

[0070] The following conclusions were drawn from the tests, as shown in the table:

[0071]

[0072]

[0073] Experimental results:

[0074] Experimental results of electromagnetic shielding effectiveness: Example 1 exhibited extremely high shielding effectiveness in the 900MHz frequency band, with an attenuation rate exceeding 99.98%, while Comparative Example 1 showed almost no shielding effect. This demonstrates the core function of the radiation shielding composite layer;

[0075] Experimental results of electromagnetic shielding effectiveness: In the 1.8GHz band, Example 1 also has excellent shielding performance, effectively blocking the radiation of the mainstream 4G network band;

[0076] Experimental results of electromagnetic shielding effectiveness: For commonly used 2.4GHz frequency bands such as WiFi and Bluetooth, the shielding effectiveness of Example 1 is still significant, proving its broadband shielding capability;

[0077] Experimental results of seepage volume: The seepage volume of Example 1 and Comparative Example 1 was extremely low and there was no difference, indicating that the liquid treatment capacity of the surface layer and the guide layer was not affected;

[0078] The reabsorption rates of both were extremely low and there was no difference, indicating that the added radiation-shielding composite layer did not affect the water-locking performance of the absorbent core.

[0079] Experimental results of permeability: The absorption rates of Example 1 and Comparative Example 1 are basically the same, and the difference is within the experimental error range, indicating that the radiation shielding composite layer does not significantly hinder the vertical permeation of liquid;

[0080] Experimental results of water vapor transmission rate: The air permeability of Example 1 is slightly lower than that of Comparative Example 1. This is because the metal fiber fabric is denser than ordinary non-woven fabric, but its value is still much higher than the industry standard and can fully meet the requirements of wearing comfort.

[0081] Experimental results of tensile strength: The longitudinal tensile strength of Example 1 is significantly higher than that of Comparative Example 1. This is because the woven fabric structure in the radiation shielding composite layer provides additional mechanical reinforcement, making the product more robust and less prone to damage during use.

[0082] In summary, through the detailed description of the above-mentioned implementation methods and the quantitative data comparison between the examples and comparative examples, it can be clearly seen that the baby-specific anti-radiation disposable diaper and its manufacturing process provided by the present invention, while fully retaining and partially optimizing the core physical properties of traditional disposable diapers such as absorption, leak prevention, breathability, and comfort, integrates a high-efficiency anti-radiation composite layer. Moreover, the technical solution of the present invention has a reasonable structural design, carefully selected materials, and a clear and feasible process route, which can realize large-scale industrial production and has significant practical value and market prospects.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Disposable radiation-proof diapers for infants, including: A diaper body (1) consisting of a top layer (10), an absorbent core (12), and a bottom membrane (14) stacked sequentially from top to bottom is characterized in that an anti-radiation composite layer (13) for shielding electromagnetic radiation is further disposed between the absorbent core (12) and the bottom membrane (14). The anti-radiation composite layer (13) contains a metal fiber blended layer (132), which is woven or knitted from yarn made of conductive metal fibers and non-conductive natural or artificial fibers, in order to form a shielding structure inside the diaper body (1) that can attenuate external electromagnetic waves.

2. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: The radiation shielding composite layer (13) comprises, from top to bottom: The first base fabric layer (131) serves as an inner protective layer adjacent to the absorbent core (12); The second base fabric layer (133) serves as an outer protective layer adjacent to the base film (14); The metal fiber blended layer (132), as the core functional layer for achieving electromagnetic shielding, is sandwiched in the middle. The first base fabric layer (131), the metal fiber blended layer (132), and the second base fabric layer (133) are tightly bonded together by hot melt adhesive or lamination process to form a functional layer that has shielding effectiveness, breathability, and structural stability.

3. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: The metal fiber blended layer (132) has metal fibers that are 316L stainless steel long fibers with a diameter ranging from 6 micrometers to 10 micrometers, and natural fibers that are combed organic cotton fibers. The blending ratio of the metal fibers and the natural fibers by weight is 25% to 35% of 316L stainless steel fibers and 65% to 75% of combed organic cotton fibers. The blended yarn made from the aforementioned blended fibers has a count of 35 to 45. The metal fiber blended layer (132) is woven using a plain weave process, with a warp density of 110 to 130 yarns / inch and a weft density of 70 to 90 yarns / inch, and the final fabric weight ranges from 100 to 120 grams / square meter.

4. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: The first base fabric layer (131) and the second base fabric layer (133) are both spunbond polypropylene nonwoven fabrics with a basis weight range of 12 to 18 g / m². Furthermore, the first base fabric layer (131), the metal fiber blended layer (132) and the second base fabric layer (133) are hot-pressed together by a polyurethane-based hot melt adhesive web with a basis weight of 6 to 10 g / m². This web structure ensures the interlayer peel strength while maximizing the moisture permeability of the entire radiation shielding composite layer (13).

5. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: The absorbent core (12) is a fully composite core structure without fluff pulp, including an upper layer of clean paper and a lower layer of clean paper, as well as a superabsorbent resin that is completely wrapped and fixed between the upper and lower layers of clean paper. The total weight of the absorbent core (12) is 400 to 500 grams per square meter, wherein the content of the superabsorbent resin accounts for more than 85% of the total weight of the absorbent core (12).

6. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: The distribution of the superabsorbent resin in the plane of the absorbent core is non-uniform, and it is designed to have a regional density distribution. In the front region of the diaper body (1) corresponding to the main urination area of ​​the infant, the amount of superabsorbent resin per unit area is set to be 15% to 25% higher than that per unit area in the rear region of the diaper body (1) to form a high-absorbency zone in which the absorbency is locally enhanced.

7. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: The surface layer (10) is a hot-air nonwoven fabric with a weight range of 20 to 25 g / m². The hot-air nonwoven fabric is composed of bicomponent fibers with a fiber fineness of 1.8 to 2.2 denier. The surface of the surface layer (10) is treated with a hydrophilic finishing agent to improve the liquid penetration rate. The surface of the surface layer (10) is also coated with microcapsule skin care ingredients containing aloe vera extract or vitamin E.

8. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: Between the surface layer (10) and the absorbent core (12), a flow guiding layer (11) is also provided. The flow guiding layer (11) is an air-laid nonwoven fabric with a basis weight range of 28 to 35 g / m². In order to enhance its liquid diffusion and conduction capabilities, the flow guiding layer (11) is provided with through holes arranged in a matrix pattern. The pore diameter of the through holes is 1.2 to 1.8 mm, the pore spacing is 3.5 to 4.5 mm, and its porosity reaches 12% to 18%. The bottom membrane (14) is a composite breathable bottom membrane, which is composed of a polyethylene cast microporous membrane with a basis weight of 15 to 20 g / m² and a spunbond nonwoven fabric with a basis weight of 13 to 17 g / m² bonded together by hot melt adhesive. The water vapor permeability of the bottom membrane (14) is not less than 5000 g / m² / 24 hours.

9. The disposable radiation-proof diaper for infants according to claim 1, characterized in that: The diaper body (1) is also provided with a waistband (2) and leg guards (3). The waistband (2) is a wrap-around, highly elastic waistband. Its base material is SMMMS composite nonwoven fabric, and 10 to 14 spandex filaments with a stretch ratio of 2.8 to 3.2 are evenly distributed in the transverse direction inside. The leg guards (3) are double-layer three-dimensional guard structures, made of spunbond nonwoven fabric that has been treated with water repellency. Each layer of guards is provided with 2 to 3 spandex filaments to form a leak-proof barrier at the root of the baby's thighs.

10. The manufacturing process of the disposable radiation-proof diaper for infants according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Preparation of the radiation shielding composite layer. Metal fibers are blended with natural or synthetic fibers at a weight ratio of 25% to 35% and 65% to 75% to form 35-45 count yarns. The yarns are then woven using a plain weave process with a warp density of 110 to 130 yarns / inch and a weft density of 70 to 90 yarns / inch to form a metal fiber blended layer with a basis weight of 100 to 120 g / m². Spunbond polypropylene nonwoven fabric with a basis weight of 12 to 18 g / m² is laid on the upper and lower surfaces of the metal fiber blended layer as the first and second base fabric layers, respectively. The layers are then hot-pressed together with a polyurethane-based hot melt adhesive web film with a basis weight of 6 to 10 g / m² to form the radiation shielding composite layer. Step 2: Preparation of absorbent core. Highly absorbent resin is laid in a regional density distribution between the upper and lower cleanroom paper. The amount of highly absorbent resin per unit area in the front and middle regions is 15% to 25% higher than that in the rear regions. After wrapping and fixing, a fully composite core structure with a total weight of 400 to 500 grams per square meter is formed. Step 3: Surface pretreatment. The bicomponent fiber hot air nonwoven fabric with a weight of 20 to 25 grams per square meter is treated with a hydrophilic finishing agent and coated with microcapsule skin care ingredients containing aloe vera extract or vitamin E. Step 4: Processing the flow guide layer. Process through holes arranged in a matrix on an air-laid nonwoven fabric with a basis weight of 28 to 35 g / m². The diameter of the through holes is 1.2 to 1.8 mm and the spacing between the holes is 3.5 to 4.5 mm. Control the opening rate to 12% to 18%. Step 5: Base film lamination. A composite breathable base film is formed by laminating a polyethylene cast microporous membrane with a basis weight of 15 to 20 g / m² with a spunbond nonwoven fabric with a basis weight of 13 to 17 g / m² using hot melt adhesive. Step Six: Composite molding of the main body. The surface layer, the flow guiding layer, the absorbent core, the anti-radiation composite layer, and the bottom film are stacked from top to bottom and laminated into the main body of the diaper through a lamination process. Step 7: Install the waistband and leg guards. Attach a wraparound, highly elastic waistband made of SMMMS composite nonwoven fabric and 10 to 14 spandex filaments with a stretch ratio of 2.8 to 3.2 to the edge of the diaper body. Install double-layer water-repellent spunbond nonwoven fabric leg guards at the leg area, with 2 to 3 spandex filaments in each layer.

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