High-breathability antibacterial paper diaper and preparation method thereof

Abstract

The invention relates to the field of hygienic products, and particularly discloses a high-breathability antibacterial paper diaper and a preparation method thereof. The high-breathability antibacterial paper diaper comprises a skin-friendly layer, an impermeable layer, an antibacterial layer, a core layer and a liquid-leakage-free bottom layer which are sequentially connected from inside to outside. The core layer comprises high-molecular water-absorbent resin particles and antibacterial microcapsules, and the addition amount of the antibacterial microcapsules is 7.15-8.31 wt% of the high-molecular water-absorbent resin particles; in addition, the preparation method disclosed by the invention has the advantage of improving the air permeability and antibacterial property of the paper diaper.

Description

Technical Field

[0001] This application relates to the field of hygiene products, and in particular to a highly breathable antibacterial diaper and a method for its preparation. Background Technology

[0002] As people's living standards improve, their demand for and requirements of personal hygiene products are also constantly increasing. As a commonly used hygiene product in infant care and the care of certain special groups, the technology related to diapers is also continuously developing. High-quality diapers can provide users with a comfortable experience, reduce the occurrence of skin problems, and alleviate the burden on caregivers to some extent. While the diaper market continues to expand, consumers are also placing more diverse demands on diaper performance, such as breathability and antibacterial properties, which is driving continuous innovation and improvement in diaper technology.

[0003] In the past, various technologies were employed in the industry to meet the basic needs of disposable diapers. For absorbency, traditional absorbent materials such as wood pulp fibers were typically used, increasing the amount of wood pulp fiber to improve absorbency. To prevent leakage, a common leak-proof layer, often made of plastic film, was usually placed on the outside of the diaper. For antibacterial properties, some diapers added common chemical antibacterial agents to inhibit bacterial growth. These methods, to a certain extent, met the basic functional requirements of disposable diapers and were common practices in the industry at the time.

[0004] However, while traditional absorbent materials can absorb a certain amount of urine, their absorption rate and retention capacity are limited, making them prone to backflow. This results in prolonged skin contact with urine, increasing the risk of skin allergies and infections. Ordinary leak-proof layers have poor breathability, creating a hot and humid environment that affects user comfort. Furthermore, common chemical antibacterial agents lack long-lasting and effective antibacterial properties and may irritate the skin, failing to meet consumer demand for highly breathable antibacterial diapers. Summary of the Invention

[0005] To improve the breathability and antibacterial properties of diapers, this application provides a highly breathable antibacterial diaper and a method for preparing the same.

[0006] In a first aspect, this application provides a highly breathable antibacterial diaper, employing the following technical solution: A highly breathable antibacterial diaper includes a skin-friendly layer, a leak-proof layer, an antibacterial layer, a core layer, and a leak-proof bottom layer connected sequentially from the inside out; the core layer includes super absorbent polymer particles and antibacterial microcapsules, wherein the amount of antibacterial microcapsules added is 7.15-8.31 wt% of the super absorbent polymer particles.

[0007] By adopting the above technical solutions, the skin-friendly layer directly contacts the skin, providing a comfortable feel; the leak-proof layer prevents urine leakage and avoids soiling clothes; the antibacterial layer inhibits bacterial growth and ensures a hygienic environment; the leak-proof bottom layer prevents urine leakage, while the superabsorbent polymer particles in the core layer have strong water absorption capacity, which can quickly absorb and lock in urine. By controlling the amount of antibacterial microcapsules added, it is possible to ensure that the antibacterial microcapsules release enough antibacterial ingredients to inhibit bacterial growth, without adding too much affecting the water absorption performance of the superabsorbent polymer particles. Thus, the diaper has both good water absorption performance and high-efficiency antibacterial ability, achieving a highly breathable and antibacterial effect.

[0008] Preferably, the core of the antibacterial microcapsule is a composite natural antibacterial agent, and the capsule wall of the antibacterial microcapsule is carboxymethyl chitosan-salicylaldehyde.

[0009] By adopting the above technical solution, the composite natural antibacterial agent has good antibacterial properties, which can effectively inhibit the growth of bacteria during the use of diapers and protect the user's skin health. The capsule wall formed by carboxymethyl chitosan-salicylaldehyde has a certain stability and slow release properties. On the one hand, it can protect the composite natural antibacterial agent in the capsule core and prevent it from being deactivated prematurely. On the other hand, during use, as urine and other liquids come into contact, the capsule wall will slowly release the composite natural antibacterial agent, so that the antibacterial effect can last longer, thereby achieving high antibacterial performance of diapers for a long time. Furthermore, when the pH of urine is high or the pH is high due to untimely diaper changes, the release of antibacterial agent is accelerated, which has a pH response function.

[0010] Preferably, the composite natural antibacterial agent comprises tea polyphenols and tannins in a mass ratio of (1.25-1.37):(2.12-2.64).

[0011] By adopting the above technical solutions, tea polyphenols have antioxidant and antibacterial properties, which can effectively inhibit the growth and reproduction of various bacteria. Tannins can coagulate and precipitate bacterial proteins, destroying the bacterial structure, thereby playing an antibacterial role. When the two are combined in a specific mass ratio, they can work together to exert antibacterial effects during the use of diapers, giving diapers good antibacterial properties, effectively inhibiting the growth of bacteria in diapers, and providing users with a healthier and more hygienic use environment.

[0012] Preferably, the method for preparing the antibacterial microcapsules includes the following steps: dissolving the composite natural antibacterial agent in an aqueous solution of carboxymethyl chitosan, mixing it evenly, and then dripping it into corn oil containing an emulsifier at a dripping rate of 2 drops / s. After the dripping is completed, stirring evenly, adding salicylaldehyde, and magnetically stirring at room temperature for 1.5-2 hours, then adding anhydrous ethanol and breaking the emulsion in an ice-water bath, centrifuging, retaining the gel layer, washing with anhydrous ethanol, and obtaining the antibacterial microcapsules.

[0013] By adopting the above technical solution, carboxymethyl chitosan reacts with salicylaldehyde to form a capsule wall, which encapsulates the composite natural antibacterial agent to form antibacterial microcapsules. Then, anhydrous ethanol is added and the emulsion is broken in an ice-water bath, which allows the microcapsules to be separated from the emulsion. Centrifugation retains the gel layer, and washing with anhydrous ethanol removes impurities, resulting in pure antibacterial microcapsules. The prepared antibacterial microcapsules can effectively exert the antibacterial effect of the composite natural antibacterial agent, thereby improving the antibacterial performance of diapers.

[0014] Preferably, the mass ratio of carboxymethyl chitosan to salicylaldehyde is (1-1.12):(4.6-4.8).

[0015] By employing the above technical solution and controlling the mass ratio of carboxymethyl chitosan and salicylaldehyde, carboxymethyl chitosan exhibits excellent film-forming properties, and salicylaldehyde, when combined with it in a suitable ratio, can effectively encapsulate the composite natural antibacterial agent. When corn oil containing emulsifier is added and subjected to a series of reactions and treatments, stable antibacterial microcapsules are formed. These stable antibacterial microcapsules, when added to the core layer of the diaper, can continuously and slowly release the composite natural antibacterial agent, thereby enhancing the antibacterial performance of the diaper, prolonging the antibacterial effect, and providing users with longer-lasting antibacterial protection.

[0016] Preferably, the amount of the composite natural antibacterial agent added is 23.5-27.6 wt% of carboxymethyl chitosan.

[0017] By adopting the above technical solution, controlling the amount of compound natural antibacterial agent added can achieve a good dispersion effect of compound natural antibacterial agent in carboxymethyl chitosan. During the preparation of antibacterial microcapsules, an appropriate proportion of compound natural antibacterial agent can be uniformly wrapped in the capsule wall formed by carboxymethyl chitosan-salicylaldehyde. During the use of diapers, the antibacterial microcapsules release compound natural antibacterial agent, which can effectively inhibit the growth of bacteria in diapers, thereby improving the antibacterial performance of diapers and ensuring the skin health of infants when using diapers.

[0018] Preferably, the leak-proof bottom layer is composed of a microporous PE membrane and a hot-air nonwoven fabric, and the side of the hot-air nonwoven fabric closest to the microporous PE membrane is printed with anthocyanin as a dye.

[0019] By employing the above technical solution, a leak-proof bottom layer is created by combining a microporous PE film and hot-air nonwoven fabric. The microporous PE film itself has numerous tiny pores, which effectively prevent liquid seepage, thus achieving a leak-proof effect, while also ensuring air circulation, giving the diaper good breathability. Simultaneously, anthocyanins are used as a dye for printing on the side of the hot-air nonwoven fabric closest to the microporous PE film. Anthocyanins have natural antibacterial properties, which can inhibit bacterial growth and reduce bacterial reproduction on the diaper surface during use, thereby enhancing the overall antibacterial ability of the diaper and providing a healthier usage environment for users. Furthermore, anthocyanins change color under alkaline conditions, allowing for timely observation if the baby's urine pH is abnormally high.

[0020] Secondly, this application provides a method for preparing highly breathable antibacterial diapers, using the following technical solution: A method for preparing a highly breathable antibacterial diaper includes the following steps: combining a skin-friendly layer, a leak-proof layer, an antibacterial layer, a core layer, and a leak-proof bottom layer from the inside out using hot melt adhesive to obtain a highly breathable antibacterial diaper.

[0021] By adopting the above technical solution, a highly breathable and antibacterial diaper is prepared by bonding the skin-friendly layer, the seepage-proof layer, the antibacterial layer, the core layer, and the leak-proof bottom layer from the inside out using hot melt adhesive. The hot melt adhesive has good adhesion, which can make the layers tightly bonded together, ensuring the stability and integrity of the diaper structure. The layers work together to produce a diaper with high breathability and antibacterial properties.

[0022] In summary, this application has the following beneficial effects: 1. Because the skin-friendly layer in this application comes into direct contact with the skin, it provides a comfortable feel; the leak-proof layer prevents urine leakage and avoids soiling clothes; the antibacterial layer inhibits bacterial growth and ensures a hygienic environment; the leak-proof bottom layer prevents urine leakage, while the superabsorbent polymer particles in the core layer have strong water absorption capacity, which can quickly absorb and lock in urine. By controlling the amount of antibacterial microcapsules added, it is possible to ensure that the antibacterial microcapsules release enough antibacterial ingredients to inhibit bacterial growth, without adding too much affecting the water absorption performance of the superabsorbent polymer particles. Thus, the diaper has both good water absorption performance and high-efficiency antibacterial ability, achieving a highly breathable and antibacterial effect.

[0023] 2. The composite natural antibacterial agent in this application has good antibacterial properties, which can effectively inhibit the growth of bacteria during the use of diapers and protect the user's skin health. The capsule wall formed by carboxymethyl chitosan-salicylaldehyde has a certain stability and slow release properties. On the one hand, it can protect the composite natural antibacterial agent in the capsule core and prevent it from being deactivated prematurely. On the other hand, during use, as urine and other liquids come into contact, the capsule wall will slowly release the composite natural antibacterial agent, so that the antibacterial effect can last longer, thereby achieving the high antibacterial performance of the diaper for a long time. Furthermore, when the urine pH is high or the pH is high due to the diaper not being changed in time, the release of the antibacterial agent is accelerated, which has a pH response function.

[0024] 3. In this application, the mass ratio of carboxymethyl chitosan and salicylaldehyde is controlled. Carboxymethyl chitosan has good film-forming properties, and when combined with salicylaldehyde in a suitable ratio, it can effectively encapsulate the composite natural antibacterial agent. When corn oil containing emulsifier is added and subjected to a series of reactions and treatments, stable antibacterial microcapsules can be formed. These stable antibacterial microcapsules, when added to the core layer of the diaper, can continuously and slowly release the composite natural antibacterial agent, thereby enhancing the antibacterial performance of the diaper, prolonging the antibacterial effect, and providing users with longer-lasting antibacterial protection. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments. Preparation Examples of Antibacterial Microcapsules 1-8

[0026] Preparation Example 1 The preparation method of antibacterial microcapsules includes the following steps: dissolving a composite natural antibacterial agent in 20 mL of 0.05 g / mL carboxymethyl chitosan aqueous solution, mixing evenly, and then adding it dropwise to 50 mL of corn oil containing 0.2 g of Span 80 at a dropping rate of 2 drops / s. After the addition is complete, stirring evenly, adding salicylaldehyde, and stirring magnetically at room temperature for 1.5 h, then adding 50 mL of anhydrous ethanol and breaking the emulsion in an ice-water bath, centrifuging, retaining the gel layer, washing with anhydrous ethanol, and obtaining antibacterial microcapsules. The composite natural antibacterial agent includes tea polyphenols and tannic acid in a mass ratio of 1.25:2.12, and the mass ratio of carboxymethyl chitosan to salicylaldehyde is 1:4.6. The amount of composite natural antibacterial agent added is 23.5 wt% of carboxymethyl chitosan.

[0027] Preparation Example 2 The preparation method of antibacterial microcapsules includes the following steps: dissolving a composite natural antibacterial agent in 20 mL of 0.05 g / mL carboxymethyl chitosan aqueous solution, mixing evenly, and then adding it dropwise to 50 mL of corn oil containing 0.2 g of Span 80 at a dropping rate of 2 drops / s. After the addition is complete, stirring evenly, adding salicylaldehyde, and stirring magnetically at room temperature for 2 h, then adding 50 mL of anhydrous ethanol and breaking the emulsion in an ice-water bath, centrifuging, retaining the gel layer, washing with anhydrous ethanol, and obtaining antibacterial microcapsules. The composite natural antibacterial agent includes tea polyphenols and tannic acid in a mass ratio of 1.37:2.64, and the mass ratio of carboxymethyl chitosan to salicylaldehyde is 1:4.6. The amount of composite natural antibacterial agent added is 27.6 wt% of carboxymethyl chitosan.

[0028] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 is that in Preparation Example 3, the compound natural antibacterial agent includes tea polyphenols and tannic acid in a mass ratio of 1.25:1.68.

[0029] Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that in Preparation Example 4, the compound natural antibacterial agent includes tea polyphenols and tannic acid in a mass ratio of 1.25:3.12.

[0030] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 1 is that in Preparation Example 5, the mass ratio of carboxymethyl chitosan to salicylaldehyde is 1:3.5.

[0031] Preparation Example 6 The difference between Preparation Example 6 and Preparation Example 1 is that in Preparation Example 6, the mass ratio of carboxymethyl chitosan to salicylaldehyde is 1:5.2.

[0032] Preparation Example 7 The difference between Preparation Example 7 and Preparation Example 1 is that in Preparation Example 7, the amount of the composite natural antibacterial agent added is 18.62 wt% of carboxymethyl chitosan.

[0033] Preparation Example 8 The difference between Preparation Example 8 and Preparation Example 1 is that in Preparation Example 8, the amount of the composite natural antibacterial agent added is 31.6 wt% of carboxymethyl chitosan. Example

[0034] Example 1 A highly breathable antibacterial diaper includes, from the inside out, a skin-friendly layer, a leak-proof layer, an antibacterial layer, a core layer, and a leak-proof bottom layer. The core layer includes superabsorbent polymer (SAP) particles and antibacterial microcapsules. The SAP particles are sodium polyacrylate particles, and the amount of antibacterial microcapsules added is 7.15 wt% of the SAP particles. The antibacterial microcapsules are selected from those prepared in Preparation Example 1. The leak-proof bottom layer is composed of a microporous PE membrane and a hot-air nonwoven fabric. The side of the hot-air nonwoven fabric closest to the microporous PE membrane is printed with anthocyanins as a dye.

[0035] The above-mentioned method for preparing highly breathable antibacterial diapers includes the following steps: combining the skin-friendly layer, the leak-proof layer, the antibacterial layer, the core layer, and the leak-proof bottom layer from the inside out using hot melt adhesive to obtain highly breathable antibacterial diapers.

[0036] Example 2

[0037] A highly breathable antibacterial diaper includes, from the inside out, a skin-friendly layer, a leak-proof layer, an antibacterial layer, a core layer, and a leak-proof bottom layer. The core layer includes superabsorbent polymer (SAP) particles and antibacterial microcapsules. The SAP particles are sodium polyacrylate particles, and the amount of antibacterial microcapsules added is 8.31 wt% of the SAP particles. The antibacterial microcapsules are selected from those prepared in Preparation Example 2. The leak-proof bottom layer is composed of a microporous PE membrane and a hot-air nonwoven fabric. The side of the hot-air nonwoven fabric closest to the microporous PE membrane is printed with anthocyanins as a dye.

[0038] The above-mentioned method for preparing highly breathable antibacterial diapers includes the following steps: combining the skin-friendly layer, the leak-proof layer, the antibacterial layer, the core layer, and the leak-proof bottom layer from the inside out using hot melt adhesive to obtain highly breathable antibacterial diapers.

[0039] Example 3

[0040] The difference between Example 3 and Example 1 is that in Example 3, the amount of antibacterial microcapsules added is 5.25 wt% of the superabsorbent polymer particles.

[0041] Example 4

[0042] The difference between Example 4 and Example 1 is that in Example 4, the amount of antibacterial microcapsules added is 12.51 wt% of the superabsorbent polymer particles.

[0043] Example 5

[0044] The difference between Example 5 and Example 1 is that in Example 5, the antibacterial microcapsules are the same as those prepared in Preparation Example 3.

[0045] Example 6

[0046] The difference between Example 6 and Example 1 is that in Example 6, the antibacterial microcapsules are the same as those prepared in Preparation Example 4.

[0047] Example 7

[0048] The difference between Example 7 and Example 1 is that in Example 7, the antibacterial microcapsules are the same as those prepared in Preparation Example 5.

[0049] Example 8

[0050] The difference between Example 8 and Example 1 is that in Example 8, the antibacterial microcapsules are the same as those prepared in Preparation Example 6.

[0051] Example 9

[0052] The difference between Example 9 and Example 1 is that in Example 9, the antibacterial microcapsules are the same as those prepared in Preparation Example 7.

[0053] Example 10

[0054] The difference between Example 10 and Example 1 is that in Example 10, the antibacterial microcapsules are the same as those prepared in Preparation Example 8. Comparative Example

[0055] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, no antibacterial microcapsules were added to the core layer. Performance testing

[0056] The diapers were prepared according to Examples 1-10 and Comparative Example 1. The air permeability, antibacterial properties and absorbency of the diapers were tested in accordance with the relevant test methods of GB / T 28004-2021 "Diapers" and QB / T5542-2020 "Antibacterial Diapers". The results are shown in Table 1.

[0057] Table 1. Performance test results of diapers project Air permeability (mm / s) Antibacterial rate / % Reabsorption rate / g Absorption rate / s Example 1 12.5 99.2 3.2 28 Example 2 12.8 99.5 3.0 26 Example 3 11.2 95.6 4.8 35 Example 4 10.8 96.1 5.1 38 Example 5 11.5 97.3 4.2 32 Example 6 11.3 96.8 4.5 34 Example 7 11.0 95.2 4.9 36 Example 8 10.9 94.8 5.2 37 Example 9 11.1 94.5 5.0 36 Example 10 10.7 93.9 5.3 39 Comparative Example 1 9.5 75.3 6.5 45 A comparison of the data from Examples 1-2 and Comparative Example 1 in Table 1 shows that the diapers prepared in Examples 1-2 have higher air permeability, antibacterial rate, and faster absorption speed, while exhibiting lower rewetting. This indicates that the high-permeability antibacterial diapers of Examples 1-2 demonstrate excellent performance in terms of air permeability, antibacterial properties, and absorbency. The diapers of Examples 1-2 utilize antibacterial microcapsules and superabsorbent polymer particles in synergy. While ensuring absorption speed and water retention capacity, the sustained-release effect of the antibacterial microcapsules achieves a long-lasting and highly effective antibacterial effect. Furthermore, the use of a leak-proof bottom layer composed of a microporous PE film and printed hot-air nonwoven fabric further enhances the overall air permeability and antibacterial properties.

[0058] Compared to Example 1, all performance characteristics declined in Examples 3-4. The amount of antibacterial microcapsules added changed in Examples 3-4. Too little addition resulted in insufficient antibacterial components and a significant decrease in the antibacterial rate; while too much addition would excessively occupy the core layer space, potentially interfering with the formation of a highly efficient water-absorbing and water-locking network structure by the superabsorbent polymer particles, leading to increased reabsorption and slower absorption. Furthermore, excessive microcapsules may also hinder the passage of water vapor to some extent, resulting in a decrease in air permeability.

[0059] Compared to Example 1, Examples 5-6 showed a weakening of antibacterial properties. Examples 5-6 altered the mass ratio of tea polyphenols to tannins in the compound natural antibacterial agent. When the ratio was unbalanced, the synergistic antibacterial effect between tea polyphenols and tannins was weakened, and its antibacterial efficiency failed to reach its optimal state, thus resulting in a decrease in the antibacterial rate.

[0060] Compared to Example 1, Examples 7-8 showed slight deficiencies in both antibacterial rate and absorption performance. Examples 7-8 adjusted the mass ratio of carboxymethyl chitosan to salicylaldehyde, which directly affects the integrity, stability, and sustained-release properties of the antibacterial microcapsule wall. Changing this mass ratio can easily lead to excessively thin capsule walls or structural instability, causing premature release or easy loss of the antibacterial components, thus failing to achieve long-lasting antibacterial effects. It may also affect the mechanical strength of the microcapsules, causing them to rupture under pressure within the core layer, thereby slightly affecting the normal function of the surrounding absorbent resin.

[0061] Compared to Example 1, Examples 9-10 show declines in all aspects. The amount of compound natural antibacterial agent added in Examples 9-10 has changed. Too low an amount directly results in insufficient effective antibacterial components within the microcapsules; too high an amount may exceed the encapsulation capacity of the capsule wall material, causing poor microcapsule formation and easy leakage of the effective components. This not only leads to poor antibacterial durability, but the leaked antibacterial agent may also locally affect the performance of the absorbent resin and become an obstacle to the air permeability channel, thus comprehensively affecting the antibacterial, absorbency, and breathability performance of the diaper.

[0062] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A highly breathable antibacterial diaper, characterized in that: It includes a skin-friendly layer, a seepage-proof layer, an antibacterial layer, a core layer, and a leak-proof bottom layer, which are connected sequentially from the inside out; the core layer includes superabsorbent polymer particles and antibacterial microcapsules, and the amount of antibacterial microcapsules added is 7.15-8.31 wt% of the superabsorbent polymer particles.

2. The highly breathable antibacterial diaper according to claim 1, characterized in that: The core of the antibacterial microcapsule is a composite natural antibacterial agent, and the capsule wall is carboxymethyl chitosan-salicylaldehyde.

3. The highly breathable antibacterial diaper according to claim 2, characterized in that: The compound natural antibacterial agent comprises tea polyphenols and tannins in a mass ratio of (1.25-1.37):(2.12-2.64).

4. The highly breathable antibacterial diaper according to claim 2, characterized in that: The method for preparing the antibacterial microcapsules includes the following steps: dissolving the composite natural antibacterial agent in an aqueous solution of carboxymethyl chitosan, mixing it evenly, and then dripping it into corn oil containing an emulsifier at a dripping rate of 2 drops / s. After the dripping is completed, stirring is carried out evenly, and salicylaldehyde is added. After stirring magnetically at room temperature for 1.5-2 hours, anhydrous ethanol is added and the emulsion is broken in an ice-water bath. The mixture is centrifuged, the gel layer is retained, and the mixture is washed with anhydrous ethanol to obtain the antibacterial microcapsules.

5. The highly breathable antibacterial diaper according to claim 4, characterized in that: The mass ratio of carboxymethyl chitosan to salicylaldehyde is (1-1.12):(4.6-4.8).

6. The highly breathable antibacterial diaper according to claim 4, characterized in that: The amount of the composite natural antibacterial agent added is 23.5-27.6 wt% of carboxymethyl chitosan.

7. The highly breathable antibacterial diaper according to claim 1, characterized in that: The leak-proof bottom layer is composed of a microporous PE membrane and a hot-air nonwoven fabric. The side of the hot-air nonwoven fabric closest to the microporous PE membrane is printed with anthocyanin as a dye.

8. A method for preparing a highly breathable antibacterial diaper according to any one of claims 1-7, characterized in that: Includes the following steps: The skin-friendly layer, the leak-proof layer, the antibacterial layer, the core layer, and the leak-proof bottom layer are bonded together from the inside out using hot melt adhesive to produce a highly breathable and antibacterial diaper.