Nonwoven fabric, method for producing nonwoven fabric, and oral product

Abstract

This application discloses a nonwoven fabric, a method for preparing the nonwoven fabric, and a mouth-held product. The nonwoven fabric is used in the mouth-held product and includes a fiber matrix, a first adhesive, and a second adhesive. The first adhesive is aminopolysaccharide-organic acid gel particles. By adding aminopolysaccharide-organic acid gel particles as the first adhesive to the fiber matrix of the nonwoven fabric, the filling of fiber pores can be reduced while achieving inter-fiber bonding and fixation, resulting in a higher initial porosity of the nonwoven fabric. Furthermore, the aminopolysaccharide-organic acid gel particles slowly swell upon contact with saliva, which can expand the fiber gaps and further increase the porosity during use. This facilitates rapid saliva penetration into the nonwoven fabric, allowing active ingredients and flavor substances to be released from the initial stage of use, thereby improving the user experience.

Description

Technical Field

[0001] This application relates to the field of oral products technology, and in particular to nonwoven fabrics, methods for preparing nonwoven fabrics, and oral products. Background Technology

[0002] Oral products containing active ingredients such as nicotine are a new type of smokeless tobacco product. When users hold them in their mouths, the saliva soaks the substrate to release active ingredients and flavor substances. With the advantages of no combustion and no secondhand smoke, they are gradually being accepted by more and more consumers.

[0003] In related technologies, non-woven fabrics are often used as the substrate for carrying active ingredients and flavor substances in oral products. During the production process, adhesives are added to the non-woven fabric to achieve the connection between fibers and structural stability.

[0004] However, the adhesives form a continuous and dense film on the fiber surface or in the pore area, which reduces the porosity and air permeability of the nonwoven fabric, thereby hindering saliva penetration and causing the active ingredients and flavor substances to be released slowly in the early stages of use, thus affecting the user experience. Summary of the Invention

[0005] To address the problem that existing nonwoven fabrics suffer from reduced porosity due to the dense adhesive film layer, which hinders saliva penetration, this application provides a nonwoven fabric, a method for preparing the nonwoven fabric, and a mouth-held product.

[0006] The first technical solution adopted in this application is to provide a nonwoven fabric for use in oral products. The nonwoven fabric includes a fiber matrix, a first adhesive, and a second adhesive; wherein the first adhesive is aminopolysaccharide-organic acid gel particles.

[0007] Among them, in the aminopolysaccharide-organic acid gel particles, the mass ratio of aminopolysaccharide to organic acid is 4:1 to 5:1.

[0008] Among them, the molecular weight of aminopolysaccharide is 50~100kDa, and the degree of deacetylation is greater than or equal to 85%.

[0009] Among them, the particle size of the aminopolysaccharide-organic acid gel particles is 2-8 micrometers, and the relative standard deviation of the particle size distribution is less than or equal to 15%.

[0010] Among them, the amino polysaccharide includes one of chitosan, modified chitosan, chitosan oligosaccharide, and deacetylated chitin, and the organic acid includes one of citric acid, lactic acid, malic acid, and succinic acid.

[0011] The nonwoven fabric includes the following components by weight: fiber matrix, 70-85 parts; first adhesive, 10-25 parts; second adhesive, 5-10 parts.

[0012] The nonwoven fabric includes functional additives, which are 0 to 5 parts by weight; the functional additives include at least one of cooling agents, sweeteners, and active ingredients.

[0013] The nonwoven fabric includes a dispersing agent, which is 0 to 0.5 parts by weight.

[0014] To solve the above-mentioned technical problems, the second technical solution adopted in this application is to provide a method for preparing nonwoven fabric, including: preparing the following components in a preset weight ratio: fiber matrix, first adhesive and second adhesive; wherein, the first adhesive is aminopolysaccharide-organic acid gel particles; adding the first adhesive and the second adhesive to the fiber matrix in a component ratio, and obtaining nonwoven fabric according to the nonwoven fabric forming process.

[0015] To solve the above-mentioned technical problems, the third technical solution adopted in this application is to provide a mouth-held product, including the above-mentioned non-woven fabric, which includes a fiber matrix, a first adhesive and a second adhesive; wherein the first adhesive is aminopolysaccharide-organic acid gel particles.

[0016] The beneficial effects of this application are as follows: Unlike related technologies, this application provides nonwoven fabric, a method for preparing nonwoven fabric, and an oral product. By adding aminopolysaccharide-organic acid gel particles as a first adhesive to the fiber matrix of the nonwoven fabric, the first adhesive can be distributed between the fibers in the form of solid particles, reducing the risk of forming a continuous dense film layer on the fiber surface or in the pore area. This achieves bonding and fixation between fibers while reducing the filling of fiber pores, thus giving the nonwoven fabric a higher initial porosity. Furthermore, the aminopolysaccharide-organic acid gel particles slowly swell upon contact with saliva, which can expand the fiber gaps and further increase the porosity during use. This facilitates rapid penetration of saliva into the nonwoven fabric, accelerating the dissolution of the active ingredients and flavor substances encapsulated inside the nonwoven fabric, thereby allowing the active ingredients and flavor substances to be released from the initial stage of use, thus improving the user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating one embodiment of the method for preparing the nonwoven fabric of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless otherwise clearly indicated above. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0021] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0022] It should be understood that the terms "comprising," "including," or any other variations used herein are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] In related technologies, non-woven fabrics are often used as the substrate for carrying active ingredients and flavor substances in oral products. During the production process, adhesives are added to the non-woven fabric to achieve the connection between fibers and structural stability.

[0024] However, in the initial stages of use of these oral products, such as the first 5 minutes, the release of active ingredients and flavor substances is slow, resulting in a delayed effect. Users have to wait a long time to perceive the effect, leading to a decrease in user satisfaction.

[0025] A deeper analysis revealed that during the production of nonwoven fabrics in related oral products, adhesives are typically added to achieve fiber bonding and structural stability. However, in actual industrial production, improper adhesive selection or unreasonable proportion control leads to the formation of a continuous, dense film layer on the fiber surface or in the pore areas. This results in a decrease in the porosity and air permeability of the nonwoven fabric, hindering saliva penetration and ultimately affecting the rapid release of active ingredients and flavor substances.

[0026] Based on the above, this application provides nonwoven fabric, a method for preparing nonwoven fabric, and oral products, which can solve the problem that the porosity of related nonwoven fabrics decreases due to the dense film layer of adhesive, thereby hindering saliva penetration.

[0027] The nonwoven fabric provided in this application is used in oral products. The nonwoven fabric includes a fiber matrix, a first adhesive, and a second adhesive; wherein the first adhesive is aminopolysaccharide-organic acid gel particles.

[0028] In this embodiment, the nonwoven fabric comprises the following components by weight: fiber matrix, 70-85 parts; first adhesive, 10-25 parts; second adhesive, 5-10 parts; functional additives, 0-5 parts; and dispersing additives, 0-0.5 parts.

[0029] The total number of portions of the above components is 100.

[0030] The fiber matrix includes at least one of natural fibers, cellulose fibers, regenerated cellulose fibers, and synthetic polymer fibers, such as viscose fibers, polyester fibers, or viscose / polyester blended fibers, and is the main supporting structure of the nonwoven fabric.

[0031] Among them, functional additives include at least one of cooling agents, sweeteners, and active ingredients.

[0032] In some embodiments, the functional additive is 0 parts by weight. In other embodiments, the functional additive is 3 parts by weight. In still other embodiments, the functional additive is 5 parts by weight.

[0033] In some specific embodiments, the cooling agent is 0-1.5 parts by weight, the sweetener is 0-1 part by weight, and the active ingredient is 0-3 parts by weight. The cooling agent includes menthol, the sweetener includes xylitol, and the active ingredient includes at least one of nicotine, an antibacterial agent, and an anti-inflammatory component.

[0034] The above-mentioned functional additives are all conventional oral ingredients. They do not chemically react with aminopolysaccharide-organic acid gel particles, fibers, or the second adhesive, and do not affect the pore structure and stability of the nonwoven fabric.

[0035] Understandably, by adding functional additives, nonwoven fabrics can produce sensory stimulations such as sweetness and coolness in the initial taste, thereby enhancing the user experience.

[0036] In some embodiments, the dispersing agent is 0.1 parts by weight. In other embodiments, the dispersing agent is 0.3 parts by weight. In still other embodiments, the dispersing agent is 0.5 parts by weight.

[0037] In some specific embodiments, the dispersant is Tween-80, namely polyoxyethylene (20) sorbitan monooleate.

[0038] The above-mentioned dispersing agents are used to improve the dispersion uniformity of aminopolysaccharide-organic acid gel particles in fibers, do not participate in bonding or pore control, and the dosage meets oral safety standards.

[0039] The second adhesive includes at least one of natural adhesives, rubber-based adhesives, hot melt adhesives, and other natural modified adhesives that are different from the first adhesive.

[0040] In some embodiments, the second adhesive may be starch, modified starch, gelatin, food-grade acrylate emulsion, or food-grade hot melt adhesive.

[0041] In this embodiment, the second adhesive is added in small amounts only when it is necessary to improve the fiber bonding strength, and the amount used is much lower than the amount added in the relevant nonwoven fabric.

[0042] Understandably, the second adhesive is added in small amounts only when it is necessary to further enhance the fiber bonding strength, and its dosage is far lower than that of conventional adhesives in related nonwoven fabrics. It can help enhance the bonding strength between fibers to a certain extent and make up for the insufficient bonding strength of the first adhesive under extreme conditions. At the same time, due to its low dosage, it reduces the risk of forming a continuous dense film on the fiber surface or in the pore area, thereby reducing the filling and clogging of fiber pores.

[0043] In this embodiment, the aminopolysaccharides and organic acids used to prepare aminopolysaccharide-organic acid gel particles are both food-grade and comply with the relevant national standards.

[0044] In this embodiment, the aminopolysaccharide includes one of chitosan, modified chitosan, chitosan oligosaccharide, and deacetylated chitin, and the organic acid includes one of citric acid, lactic acid, malic acid, and succinic acid.

[0045] In some embodiments, the modified chitosan can be hydroxypropyl chitosan.

[0046] In some embodiments, the aminopolysaccharide-organic acid gel particles are chitosan-citric acid gel particles. In other embodiments, the aminopolysaccharide-organic acid gel particles are chitosan-lactic acid gel particles. In still other embodiments, the aminopolysaccharide-organic acid gel particles are chitosan-malic acid gel particles. In yet other embodiments, the aminopolysaccharide-organic acid gel particles are chitosan-succinic acid gel particles. In still other embodiments, the aminopolysaccharide-organic acid gel particles are chitosan oligosaccharide-citric acid gel particles. In still other embodiments, the aminopolysaccharide-organic acid gel particles are chitosan oligosaccharide-malic acid gel particles. In still other embodiments, the aminopolysaccharide-organic acid gel particles are hydroxypropyl chitosan-lactic acid gel particles. In still other embodiments, the aminopolysaccharide-organic acid gel particles are deacetylated chitin-lactic acid gel particles. In still other embodiments, the aminopolysaccharide-organic acid gel particles are deacetylated chitin-succinic acid gel particles.

[0047] This section uses chitosan-citric acid gel particles as an example to illustrate the adhesion mechanism of aminopolysaccharide-organic acid gel particles.

[0048] Chitosan is a natural high-molecular-weight polysaccharide obtained from chitin through deacetylation. Chitin is mainly derived from the shells of crustaceans such as shrimp and crab. Citric acid is a naturally occurring organic acid widely found in citrus fruits.

[0049] Chitosan molecules contain a large number of polar hydroxyl (-OH) and amino (-NH2) groups, exhibiting excellent biocompatibility and adhesion properties. Citric acid, with its good biocompatibility, acts as a cross-linking agent, interacting with the amino groups on the chitosan molecular chain through ionic cross-linking or hydrogen bonding to form a three-dimensional network structure. This transforms chitosan from a soluble polymer into solid gel particles with sustained-release swelling properties.

[0050] Adding chitosan-citric acid gel particles as the first adhesive to the fiber matrix has two aspects of bonding effect: First, the chitosan-citric acid gel particles, in solid particle form, are stuck at fiber intersections or fiber gaps, connecting the fibers together through physical occupancy and mechanical interlocking. This connection is similar to the physical anchoring effect of "wedges" or "rivets." The chitosan-citric acid gel particles themselves do not flow, but fix the relative positions of the fibers through their volume and position. Second, chitosan itself is a natural polymer with a large number of polar groups such as hydroxyl groups on its molecular chain. These groups can form hydrogen bonds with polar groups on the fiber surface, such as hydroxyl groups in cellulose fibers, generating adhesive force. Even after being cross-linked with citric acid to form gel particles, the surface of the gel particles still retains these active groups, which can adhere to the fiber surface and form a surface adhesion effect.

[0051] Meanwhile, since the chitosan-citric acid gel particles are distributed between the fibers in the form of solid particles, they do not form a continuous and dense film on the fiber surface or in the pore area, which can reduce the filling of fiber pores while achieving inter-fiber bonding and fixation.

[0052] Furthermore, the aminopolysaccharide-organic acid gel particles in this embodiment are slow-release gel particles, possessing slow-release swelling properties, and can slowly swell upon absorbing moisture after contact with saliva.

[0053] In this embodiment, the weight of the first adhesive can be dynamically adjusted within a preset weight range.

[0054] In some embodiments, the first adhesive comprises 10 parts by weight. In other embodiments, the first adhesive comprises 15 parts by weight. In still other embodiments, the first adhesive comprises 20 parts by weight. In yet other embodiments, the first adhesive comprises 25 parts by weight.

[0055] Understandably, the amount of aminopolysaccharide-organic acid gel particles added in this embodiment is controlled at 10 to 25 parts because within this range, the aminopolysaccharide-organic acid gel particles can form an appropriate and uniform distribution in the fiber matrix.

[0056] Specifically, an appropriate amount of gel particles distributed at fiber intersections can achieve effective bonding between fibers through physical anchoring and surface hydrogen bonding, ensuring the structural stability of the nonwoven fabric. Simultaneously, the appropriate amount of particles, distributed in solid form within the fiber gaps, avoids insufficient support due to insufficient quantity, nor excessive accumulation and blockage due to excessive quantity, thus maintaining a high initial porosity. Furthermore, the appropriate amount of aminopolysaccharide-organic acid gel particles slowly swell upon contact with saliva, effectively opening the fiber gaps, further increasing porosity, and promoting saliva penetration.

[0057] Understandably, if the amount of aminopolysaccharide-organic acid gel particles added is less than 10 parts, the number of gel particles may be insufficient, making it difficult to form sufficient support and adhesion between fibers, resulting in limited improvement in porosity and insufficient structural stability of the nonwoven fabric. If the amount added is higher than 25 parts, there will be too many gel particles, which may occupy too many fiber gaps, leading to a reduction in effective contact between fibers, which in turn affects the structural strength of the nonwoven fabric, and may even cause local pore blockage due to particle accumulation. Therefore, in this embodiment, the amount of aminopolysaccharide-organic acid gel particles added is controlled at 10-25 parts, which enables the nonwoven fabric to achieve a better balance between bonding strength, porosity, and air permeability.

[0058] In this embodiment, the mass ratio of aminopolysaccharide to organic acid in the aminopolysaccharide-organic acid gel particles is 4:1 to 5:1.

[0059] In some embodiments, the mass ratio of aminopolysaccharide to organic acid in the aminopolysaccharide-organic acid gel particles is 4:1. In other embodiments, the mass ratio of aminopolysaccharide to organic acid in the aminopolysaccharide-organic acid gel particles is 5:1.

[0060] In this embodiment, by controlling the mass ratio of aminopolysaccharide to organic acid at 4:1 to 5:1, gel particles with stable structure and moderate swelling properties can be formed.

[0061] Understandably, if the proportion of aminopolysaccharides is too low, i.e., the proportion of organic acids is too high, the cross-linking will be too high, resulting in insufficient particle swelling and difficulty in effectively opening the fiber gaps. If the proportion of aminopolysaccharides is too high, i.e., the proportion of organic acids is too low, the cross-linking will be insufficient, the particle structure will be loose, and it will be prone to softening, clumping, or collapse, making it impossible to maintain a stable pore structure over a long period. Therefore, limiting the mass ratio of aminopolysaccharides to organic acids to 4:1 to 5:1 can balance the structural stability of gel particles with moderate swelling performance, thereby achieving effective improvement and long-term maintenance of porosity during use.

[0062] In this embodiment, the molecular weight of the aminopolysaccharide is 50~100kDa, and the degree of deacetylation is greater than or equal to 85%.

[0063] In some embodiments, the aminopolysaccharide has a molecular weight of 50 kDa and a degree of deacetylation of 85%. In other embodiments, the aminopolysaccharide has a molecular weight of 75 kDa and a degree of deacetylation of 90%. In still other embodiments, the aminopolysaccharide has a molecular weight of 100 kDa and a degree of deacetylation of 85%.

[0064] In this embodiment, the molecular weight of the aminopolysaccharide is controlled at 50~100kDa, and its degree of deacetylation is controlled to be greater than or equal to 85% because within this parameter range, the aminopolysaccharide molecular chain length is moderate, and the molecular chain contains sufficient free amino groups, which can fully crosslink with the carboxyl groups of organic acids to form a three-dimensional network structure with moderate crosslink density, and make the resulting gel particles have the following characteristics: (1) Structural stability: the gel particles are not easy to soften, break or collapse during the swelling process, which is conducive to maintaining the complete solid form; (2) Moderate swelling: the gel particles can effectively open the fiber gaps without causing pore blockage due to excessive swelling; (3) Slow-release swelling performance: the gel particles swell slowly after contact with saliva, rather than dissolving instantly or expanding rapidly, which can gradually open the fiber gaps during use, thereby achieving dynamic control of porosity.

[0065] Understandably, if the molecular weight is below 50 kDa, the aminopolysaccharide molecular chains are too short, resulting in an insufficiently dense network structure after cross-linking. The particles tend to swell or break down too quickly upon contact with saliva, making a slow and controllable swelling process difficult to achieve. Conversely, if the molecular weight is above 100 kDa, the molecular chains are too long, leading to an overly dense network after cross-linking. This results in a slow swelling rate, making it difficult to open the fiber gaps within an effective timeframe. If the degree of deacetylation is below 85%, there are insufficient free amino groups, resulting in inadequate cross-linking, a loose particle structure, uneven swelling, and a tendency to soften and collapse. Therefore, limiting the molecular weight of the aminopolysaccharide to 50–100 kDa and the degree of deacetylation to ≥85% is crucial to ensuring the sustained-release swelling properties of the gel particles.

[0066] In this embodiment, the particle size of the aminopolysaccharide-organic acid gel particles is 2-8 micrometers, and the relative standard deviation (RSD) of the particle size distribution is less than or equal to 15%.

[0067] The particle size of the aminopolysaccharide-organic acid gel particles is the inherent particle size obtained based on the aforementioned mass ratio and molecular weight.

[0068] In some embodiments, the aminopolysaccharide-organic acid gel particles have a particle size of 2 micrometers and a relative standard deviation of 15% for their particle size distribution. In other embodiments, the aminopolysaccharide-organic acid gel particles have a particle size of 5 micrometers and a relative standard deviation of 13% for their particle size distribution. In still other embodiments, the aminopolysaccharide-organic acid gel particles have a particle size of 8 micrometers and a relative standard deviation of 14% for their particle size distribution.

[0069] If the particle size of the aminopolysaccharide-organic acid gel particles is too small (less than 2 micrometers), the particles are prone to embedding inside the fibers or agglomerating, making it difficult to form effective support gaps between the fibers. If the particle size is too large (greater than 8 micrometers), the aminopolysaccharide-organic acid gel particles may clog the fiber pores, thus reducing the air permeability and permeability of the nonwoven fabric. At the same time, uniform particle size distribution (RSD ≤ 15%) ensures consistent particle dispersion between fibers, avoiding localized accumulation or uneven porosity caused by excessive particle size differences.

[0070] Understandably, this embodiment, by using the aforementioned defined composition ratio of aminopolysaccharide-organic acid gel particles, ensures that the particle size of the aminopolysaccharide-organic acid gel particles is 2 to 8 micrometers and that the relative standard deviation of the particle size distribution is ≤15%. This enables the gel particles to be uniformly and stably distributed between the fibers and to form a uniform and stable support structure between the fibers, thereby maintaining the high initial porosity of the nonwoven fabric while ensuring adhesion and fixation.

[0071] Here, we will continue to use chitosan-citric acid gel particles as an example to explain the sustained-release swelling mechanism of aminopolysaccharide-organic acid gel particles.

[0072] In this embodiment, the swelling rate of chitosan-citric acid gel particles in a simulated saliva environment is 120% to 150%.

[0073] Among them, the simulated saliva environment has a temperature of 37℃ and a pH of 6.5~7.2, which is closest to the saliva environment in the human oral cavity.

[0074] In some embodiments, the chitosan-citric acid gel particles exhibit a swelling rate of 120% in a simulated saliva environment. In other embodiments, the chitosan-citric acid gel particles exhibit a swelling rate of 130% in a simulated saliva environment. In still other embodiments, the chitosan-citric acid gel particles exhibit a swelling rate of 150% in a simulated saliva environment.

[0075] In this embodiment, the chitosan-citric acid gel particles gradually absorb water and swell upon contact with saliva, increasing their volume to 120%–150% of their original size. This swelling process is slow and controllable: initial swelling slightly increases the particle volume, initially widening the fiber gaps; as swelling progresses, the particles further expand, continuously widening the fiber gaps, gradually increasing the porosity during use; once swelling reaches equilibrium, the particle volume remains stable, and the porosity is maintained at a certain level, ensuring long-term stable permeability.

[0076] If the swelling rate is too low, i.e. below 120%, the volume expansion of the chitosan-citric acid gel particles is insufficient, making it difficult to effectively open the fiber gaps, resulting in limited improvement in porosity and insignificant improvement in saliva permeability. If the swelling rate is too high, i.e. above 150%, the chitosan-citric acid gel particles expand excessively, which may lead to excessive opening of the fiber gaps, damaging the structural stability of the nonwoven fabric, or even clogging the pores due to excessive volume.

[0077] Understandably, this embodiment, through the aforementioned defined composition ratio, particle size, and amount of chitosan-citric acid gel particles added to the nonwoven fabric, can control the swelling rate at 120% to 150%. This allows the gel particles to appropriately expand the fiber gaps after swelling, increasing porosity while maintaining the structural stability of the nonwoven fabric. This achieves a dynamic control path of "higher initial porosity → moderate increase in porosity during use → stability over long-term use," ultimately promoting rapid saliva penetration and enabling the release of active ingredients and flavor substances from the initial stage of oral product use, thereby enhancing the user experience.

[0078] Unlike related technologies, this embodiment adds aminopolysaccharide-organic acid gel particles as a first adhesive to the fiber matrix of the nonwoven fabric. This allows the first adhesive to be distributed between the fibers in the form of solid particles, reducing the risk of forming a continuous, dense film on the fiber surface or in the pore areas. This achieves fiber bonding and fixation while reducing the filling of fiber pores, resulting in a higher initial porosity for the nonwoven fabric. Furthermore, the aminopolysaccharide-organic acid gel particles slowly swell upon contact with saliva, expanding the fiber gaps and further increasing the porosity during use. This facilitates rapid saliva penetration into the nonwoven fabric, accelerating the dissolution of the active ingredients and flavor substances encapsulated within the fabric. This allows the active ingredients and flavor substances to be released from the initial stage of use, thereby enhancing the user experience.

[0079] Correspondingly, this application provides a method for preparing nonwoven fabric.

[0080] Please see Figure 1 , Figure 1 This is a schematic flowchart illustrating one embodiment of the nonwoven fabric preparation method of this application. In this embodiment, the preparation method includes: S11: Prepare the following components according to the preset weight parts: fiber matrix, first adhesive and second adhesive; wherein, the first adhesive is aminopolysaccharide-organic acid gel particles.

[0081] In this embodiment, the nonwoven fabric comprises the following components by weight: fiber matrix, 70-85 parts; first adhesive, 10-25 parts; second adhesive, 5-10 parts; functional additives, 0-5 parts; and dispersing additives, 0-0.5 parts.

[0082] The total number of portions of the above components is 100.

[0083] The fiber matrix includes at least one of natural fibers, cellulose fibers, regenerated cellulose fibers, and synthetic polymer fibers, such as viscose fibers, polyester fibers, or viscose / polyester blended fibers, and is the main supporting structure of the nonwoven fabric.

[0084] The functional additives include at least one of cooling agents, sweeteners, and active ingredients. All of the above functional additives are conventional oral ingredients and do not chemically react with aminopolysaccharide-organic acid gel particles, fibers, or the second adhesive, and do not affect the pore structure and stability of the nonwoven fabric.

[0085] The dispersing agent is used to improve the uniformity of dispersion of aminopolysaccharide-organic acid gel particles in fibers. It does not participate in bonding or pore control, and the dosage meets oral safety standards.

[0086] The second adhesive includes at least one of natural adhesives, rubber-based adhesives, hot-melt adhesives, and other modified natural adhesives different from the first adhesive. Furthermore, the second adhesive is added in small amounts only when it is necessary to improve fiber bonding strength, and the amount used is far lower than that added to the relevant nonwoven fabric.

[0087] In this embodiment, the aminopolysaccharide includes one of chitosan, chitosan oligosaccharide, and deacetylated chitin, and the organic acid includes one of citric acid, lactic acid, malic acid, and succinic acid.

[0088] In some implementations, chitosan can be hydroxypropyl chitosan.

[0089] In this embodiment, the mass ratio of aminopolysaccharide to organic acid in the aminopolysaccharide-organic acid gel particles is 4:1 to 5:1. The molecular weight of the aminopolysaccharide is 50 to 100 kDa, and the degree of deacetylation is greater than or equal to 85%. The particle size of the aminopolysaccharide-organic acid gel particles is 2 to 8 micrometers, and the RSD of the particle size distribution is less than or equal to 15%.

[0090] In this embodiment, the aminopolysaccharide-organic acid gel particles are slow-release gel particles with slow-release swelling properties. After contact with saliva, they absorb water and slowly swell.

[0091] In some embodiments, the chitosan-citric acid gel particles have a swelling rate of 120% to 150% in a simulated saliva environment.

[0092] In this embodiment, aminopolysaccharide-organic acid gel particles can be prepared by any one of the following methods: emulsification crosslinking, coagulation, spray drying, and spray gelation.

[0093] In some specific embodiments, chitosan-citric acid gel particles are prepared by emulsification crosslinking method. The specific process is as follows: (1) Chitosan is dissolved in dilute acid solution, and citric acid corresponding to the above component ratio is added and stirred evenly to form an aqueous phase; (2) An oil phase, such as liquid paraffin or vegetable oil, is mixed with an emulsifier; (3) The aqueous phase is slowly added to the oil phase and stirred at high speed to form a water-in-oil emulsion; (4) The mixture is heated to a preset temperature, such as 40~60℃, and stirred for 2~4 hours to crosslink and solidify chitosan and citric acid; (5) The mixture is centrifuged, and the oil phase is washed away with an organic solvent, such as ethanol or acetone, and dried to obtain chitosan-citric acid gel particles.

[0094] S12: Add the first adhesive and the second adhesive to the fiber matrix according to the component ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0095] In this embodiment, aminopolysaccharide-organic acid gel particles and a second adhesive are added to the fiber matrix according to the specified proportions, and nonwoven fabric is obtained according to the nonwoven fabric forming process.

[0096] Among them, after the aminopolysaccharide-organic acid gel particles are combined with the fiber matrix, they can form a nonwoven fabric structure with multiple functions. That is, the aminopolysaccharide-organic acid gel particles themselves are both adhesives and pore control components, without the need to add other functional components to achieve pore control.

[0097] Among them, the nonwoven fabric forming process is an existing related process, such as hydroentangling, needle punching, hot air bonding, etc.

[0098] In this embodiment, there is no need to limit the preparation process of aminopolysaccharide-organic acid gel particles, nor is it necessary to bind a specific nonwoven fabric forming process. By simply limiting the core characteristics of the aminopolysaccharide-organic acid gel particles, including the mass ratio of chitosan to citric acid of 4:1 to 5:1, the molecular weight of chitosan of 50 to 100 kDa and the degree of deacetylation ≥85%, the particle size of 2 to 8 micrometers, and limiting the amount of aminopolysaccharide-organic acid gel particles added to the nonwoven fabric, it is possible to flexibly adapt to various conventional nonwoven fabric forming processes such as hydroentanglement, needle punching, and hot air bonding that are currently available in the industry.

[0099] Understandably, since there is no need to limit the preparation method of aminopolysaccharide-organic acid gel particles, nor is it necessary to modify the nonwoven fabric production line, the technology conversion cost of using aminopolysaccharide-organic acid gel particles as an adhesive can be greatly reduced, which has good industrial practicality and promotion application value.

[0100] Unlike related technologies, this embodiment adds aminopolysaccharide-organic acid gel particles as a first adhesive to the fiber matrix of the nonwoven fabric. This allows the first adhesive to be distributed between the fibers in the form of solid particles, reducing the risk of forming a continuous, dense film on the fiber surface or in the pore areas. This achieves fiber bonding and fixation while reducing the filling of fiber pores, resulting in a higher initial porosity for the nonwoven fabric. Furthermore, the aminopolysaccharide-organic acid gel particles slowly swell upon contact with saliva, expanding the fiber gaps and further increasing the porosity during use. This facilitates rapid saliva penetration into the nonwoven fabric, accelerating the dissolution of the active ingredients and flavor substances encapsulated within the fabric. This allows the active ingredients and flavor substances to be released from the initial stage of use, thereby enhancing the user experience.

[0101] Correspondingly, this application provides a mouth-holding product.

[0102] In this embodiment, the oral product includes the aforementioned nonwoven fabric, which includes a fiber matrix, a first adhesive, and a second adhesive; wherein the first adhesive is aminopolysaccharide-organic acid gel particles.

[0103] The nonwoven fabric includes the following components by weight: fiber matrix, 70-85 parts; first adhesive, 10-25 parts; second adhesive, 5-10 parts; functional additives, 0-5 parts; and dispersing additives, 0-0.5 parts.

[0104] The total number of portions of the above components is 100.

[0105] Understandably, this embodiment, by adding aminopolysaccharide-organic acid gel particles as a first adhesive to the fiber matrix of the nonwoven fabric, enables the first adhesive to be distributed between the fibers in the form of solid particles. This reduces the risk of forming a continuous, dense film layer on the fiber surface or in the pore areas, thereby achieving fiber bonding and fixation while reducing the filling of fiber pores, resulting in a higher initial porosity for the nonwoven fabric. Furthermore, the aminopolysaccharide-organic acid gel particles slowly swell upon contact with saliva, which can expand the fiber gaps and further increase the porosity during use. This facilitates rapid penetration of saliva into the nonwoven fabric, accelerating the dissolution of the active ingredients and flavor substances encapsulated within the nonwoven fabric. Consequently, the active ingredients and flavor substances in the oral product are released from the initial stage of use, thereby enhancing the user experience.

[0106] To facilitate understanding of the embodiments of this application, the following non-limiting embodiments are provided to further illustrate the application in detail.

[0107] Example 1 Prepare the following components according to the preset weight ratio: fiber matrix, 80 parts; first binder, 15 parts; second binder, 5 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 4:1, the molecular weight of chitosan is 80 kDa, the degree of deacetylation is 90%, the particle size of the chitosan-citric acid gel particles is 5 micrometers, and the relative standard deviation of the particle size distribution is 12%. Add the first and second binders to the fiber matrix according to the specified ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0108] Example 2 Prepare the following components according to the preset weight ratio: fiber matrix, 80 parts; first binder, 15 parts; second binder, 5 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is chitosan-lactic acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to lactic acid is 4:1, the molecular weight of chitosan is 80 kDa, the degree of deacetylation is 90%, the particle size of the chitosan-lactic acid gel particles is 5 micrometers, and the relative standard deviation of the particle size distribution is 12%. Add the first and second binders to the fiber matrix according to the specified ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0109] Example 3 Prepare the following components according to the preset weight ratio: fiber matrix, 80 parts; first binder, 15 parts; second binder, 5 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is chitosan-malic acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to malic acid is 9:2, the molecular weight of chitosan is 80 kDa, the degree of deacetylation is 90%, the particle size of the chitosan-malic acid gel particles is 5 micrometers, and the relative standard deviation of the particle size distribution is 12%. Add the first and second binders to the fiber matrix according to the specified ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0110] Example 4 Prepare the following components according to the preset weight ratio: fiber matrix, 80 parts; first binder, 15 parts; second binder, 5 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is chitosan-succinic acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to succinic acid is 4:1, the molecular weight of chitosan is 80 kDa, the degree of deacetylation is 90%, the particle size of the chitosan-succinic acid gel particles is 5 micrometers, and the relative standard deviation of the particle size distribution is 12%. Add the first and second binders to the fiber matrix according to the specified ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0111] Example 5 Prepare the following components according to the preset weight ratio: fiber matrix, 70 parts; first binder, 25 parts; second binder, 5 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 8 micrometers, and the relative standard deviation of the particle size distribution is 10%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0112] Example 6 Prepare the following components according to the preset weight parts: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 8 micrometers, and the relative standard deviation of the particle size distribution is 10%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0113] Example 7 Prepare the following components according to the preset weight ratio: fiber matrix, 80 parts; first binder, 10 parts; second binder, 10 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 8 micrometers, and the relative standard deviation of the particle size distribution is 10%. Add the first and second binders to the fiber matrix according to the specified ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0114] Example 8 Prepare the following components according to the preset weight parts: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is chitosan oligosaccharide-malic acid gel particles, with a chitosan oligosaccharide to malic acid mass ratio of 4:1, a chitosan oligosaccharide molecular weight of 85 kDa, a degree of deacetylation of 90%, a particle size of 6 micrometers, and a relative standard deviation of 12% for particle size distribution. Add the first binder and second binder to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0115] Example 9 Prepare the following components according to the preset weight ratio: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is hydroxypropyl chitosan-lactic acid gel particles, with a hydroxypropyl chitosan to lactic acid mass ratio of 4:1. The hydroxypropyl chitosan has a molecular weight of 85 kDa, a degree of deacetylation of 90%, a particle size of 6 micrometers, and a relative standard deviation of 12% in particle size distribution. Add the first and second binders to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0116] Example 10 Prepare the following components according to the preset weight ratio: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersing agent, 0 parts. The first binder is deacetylated chitosan-succinic acid gel particles, and the second binder is modified starch. The mass ratio of deacetylated chitosan to succinic acid is 4:1, the molecular weight of deacetylated chitosan is 85 kDa, the degree of deacetylation is 90%, the particle size of the deacetylated chitosan-succinic acid gel particles is 6 micrometers, and the relative standard deviation of the particle size distribution is 12%. Add the first binder and the second binder to the fiber matrix according to the component ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0117] Example 11 Prepare the following components according to the preset weight ratio: fiber matrix, 72 parts; first binder, 20 parts; second binder, 5 parts; functional additive, 2.5 parts; dispersant, 0.5 parts. The first binder is chitosan-citric acid gel particles, the second binder is modified starch, the functional additive is a sweetener, and the dispersant is Tween-80. The mass ratio of chitosan to citric acid is 4:1, the molecular weight of chitosan is 80 kDa, the degree of deacetylation is 90%, the particle size of the chitosan-citric acid gel particles is 2 micrometers, and the relative standard deviation of the particle size distribution is 12%. Add the first binder, second binder, functional additive, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0118] Control group 1 Prepare the following components according to the preset weight parts: fiber matrix, 80 parts; first binder, 0 parts; second binder, 20 parts; functional additives, 0 parts; dispersing agent, 0 parts. The second binder is modified starch. Add the second binder to the fiber matrix according to the component ratio, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0119] Control group 2 Prepare the following components according to the preset weight ratio: fiber matrix, 75 parts; first binder, 5 parts; second binder, 20 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 6 micrometers, and the relative standard deviation of the particle size distribution is 10%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0120] Control group 3 Prepare the following components according to the preset weight ratio: fiber matrix, 70 parts; first binder, 29 parts; second binder, 1 part; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 6 micrometers, and the relative standard deviation of the particle size distribution is 10%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0121] Control group 4 Prepare the following components according to the preset weight ratio: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 3:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 1 micrometer, and the relative standard deviation of the particle size distribution is 18%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0122] Control group 5 Prepare the following components according to the preset weight parts: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 7:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 10 micrometers, and the relative standard deviation of the particle size distribution is 20%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0123] Control group 6 Prepare the following components according to the preset weight parts: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 50 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 12 micrometers, and the relative standard deviation of the particle size distribution is 20%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0124] Control group 6 Prepare the following components according to the preset weight parts: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 120 kDa, the degree of deacetylation is 95%, the particle size of the chitosan-citric acid gel particles is 10 micrometers, and the relative standard deviation of the particle size distribution is 20%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0125] Control group 7 Prepare the following components according to the preset weight parts: fiber matrix, 75 parts; first binder, 20 parts; second binder, 5 parts; functional additives, 0 parts; dispersant, 0 parts. The first binder is chitosan-citric acid gel particles, and the second binder is modified starch. The mass ratio of chitosan to citric acid is 5:1, the molecular weight of chitosan is 90 kDa, the degree of deacetylation is 70%, the particle size of the chitosan-citric acid gel particles is 1 micrometer, and the relative standard deviation of the particle size distribution is 20%. Add the first binder, second binder, functional additives, and dispersant to the fiber matrix according to the specified proportions, and obtain the nonwoven fabric according to the nonwoven fabric forming process.

[0126] For the nonwoven fabrics prepared in Examples 1-11 and Control Groups 1-7, the nonwoven fabrics prepared in each group were placed under constant temperature and humidity (25℃, 50%RH) conditions for 24 hours, and the porosity and attenuation rate of multiple nonwoven fabrics were tested respectively.

[0127] The porosity testing method is as follows: The porosity of the nonwoven fabric was tested at the following time points: 0h after molding (i.e., before contact with simulated saliva), 0.5h of simulated use, and 1h of simulated use. After each test, fresh simulated saliva was used to simulate the continuous immersion of the oral cavity environment.

[0128] The attenuation rate test method is as follows: Calculate the attenuation rate using the following formula: Attenuation rate (0.5~1h) = (Porosity of simulated use for 0.5h - Porosity of simulated use for 1h) / Porosity of simulated use for 0.5h × 100%.

[0129] The test results are shown in Table 1: Table 1. Porosity test results and attenuation rate test results

[0130] The lower the attenuation rate, the more stable the pore structure of the nonwoven fabric is in long-term simulated oral use (0.5-1h, which is close to the long-term use time of the actual oral scenario), and the less likely it is to be blocked or shrinked by factors such as swelling and attenuation of gel particles and fiber deformation.

[0131] Table 1 shows that the initial porosity of the nonwoven fabric prepared in control group 1, i.e., the porosity after molding, is lower. This indicates that when only traditional adhesives are added as the adhesive for nonwoven fabrics without adding aminopolysaccharide-organic acid gel particles, the traditional adhesives will form a continuous and dense film layer on the fiber surface or pore area during the nonwoven fabric production process, resulting in a lower initial porosity of the nonwoven fabric. Meanwhile, the longer the nonwoven fabric prepared in control group 1 is used in the simulated environment, the lower its porosity becomes, and the decay rate from 0.5 to 1 hour is also higher. This indicates that the porosity of this nonwoven fabric will further decrease during use, and its air permeability will also decrease. The pore structure is unstable and easily blocked or shrunk due to factors such as gel particle swelling and decay, and fiber deformation.

[0132] Furthermore, as shown in Table 1, the initial porosity of the nonwoven fabrics prepared in Examples 1-11 was higher than that of the control group 1, and the initial porosity was greater than 30. This indicates that the aminopolysaccharide-organic acid gel particles do not form a continuous dense film layer on the fiber surface or in the pore area. They can reduce the filling of fiber pores while achieving inter-fiber bonding and fixation, thereby maintaining a high initial porosity. Moreover, the longer the nonwoven fabrics prepared in Examples 1-11 were used in the simulated environment, the higher the porosity became compared to the initial porosity. This indicates that the aminopolysaccharide-organic acid gel particles swell slowly after contact with saliva, which can effectively open the fiber gaps and further increase the porosity. The decay rate of the nonwoven fabrics prepared in Examples 1-11 from 0.5 to 1 hour was also low, indicating that the nonwoven fabrics with added aminopolysaccharide-organic acid gel particles had a more stable pore structure during long-term simulated oral use and were less prone to pore blockage or shrinkage due to factors such as gel particle swelling decay and fiber deformation.

[0133] Furthermore, as shown in Table 1, the initial porosity of the nonwoven fabrics in Examples 5-7 decreased sequentially, and the degree of porosity improvement during use also decreased sequentially. At the same time, the decay rate from 0.5 to 1 h also increased sequentially. This indicates that as the amount of aminopolysaccharide-organic acid gel particles added decreases and the amount of traditional additives added increases, the initial porosity, porosity during use, and decay rate of the nonwoven fabric will all be inferior to those of the nonwoven fabric with less traditional additives added while adding aminopolysaccharide-organic acid gel particles.

[0134] Furthermore, as can be seen from Examples 1 to 4 in Table 1, by adjusting the type of organic acid within the preset range and making the chitosan-organic acid gel particles have defined core characteristics, the RSD of the chitosan-organic acid gel particles can be less than 15%. As a result, the nonwoven fabrics in Examples 1 to 4 all have high initial porosity, and the pore structure of the nonwoven fabric is relatively stable during long-term simulated oral use. It is not easy for the pores to be blocked or shrinked due to factors such as swelling and decay of gel particles and fiber deformation.

[0135] Furthermore, as can be seen from Examples 6, 8-10 in Table 1, adjusting the types of aminopolysaccharides and organic acids within a preset range, and ensuring that the aminopolysaccharide-organic acid gel particles possess defined core characteristics, can make the RSD of the aminopolysaccharide-organic acid gel particles less than 15%. This results in the nonwoven fabrics in Examples 6, 8-10 having high initial porosity, and the nonwoven fabrics exhibiting stable pore structure during long-term simulated oral use, making them less prone to pore blockage or shrinkage due to factors such as gel particle swelling attenuation and fiber deformation.

[0136] Furthermore, as can be seen from Example 11 in Table 1, adding functional additives and dispersing additives will not affect the performance of the nonwoven fabric.

[0137] Furthermore, as shown in control groups 2-3 of Table 1, when the amount of added aminopolysaccharide-organic acid gel particles is less than 10 parts or greater than 25 parts, compared to Examples 1-11 with appropriate amounts of added aminopolysaccharide-organic acid gel particles, the porosity and pore structure stability of the nonwoven fabric are reduced. As shown in control groups 4-5 of Table 1, when the mass ratio of aminopolysaccharide to organic acid is less than 4:1 or greater than 5:1, compared to Example 6 with an appropriate mass ratio of aminopolysaccharide to organic acid, the porosity and pore structure stability of the nonwoven fabric are reduced. As shown in control groups 6-7 of Table 1, when the molecular weight of the aminopolysaccharide exceeds the preset molecular weight or the degree of deacetylation is less than the preset value, compared to Example 6 with appropriate molecular weight and degree of deacetylation of the aminopolysaccharide, the porosity and pore structure stability of the nonwoven fabric are reduced.

[0138] Unlike related technologies, this application adds aminopolysaccharide-organic acid gel particles as a first adhesive to the fiber matrix of the nonwoven fabric. This allows the first adhesive to be distributed between the fibers in the form of solid particles, reducing the risk of forming a continuous, dense film on the fiber surface or in the pore areas. This achieves fiber bonding and fixation while reducing the filling of fiber pores, resulting in a higher initial porosity for the nonwoven fabric. Furthermore, the aminopolysaccharide-organic acid gel particles slowly swell upon contact with saliva, which can expand the fiber gaps and further increase the porosity during use. This facilitates rapid saliva penetration into the nonwoven fabric, accelerating the dissolution of the active ingredients and flavor substances encapsulated within the nonwoven fabric. This allows the active ingredients and flavor substances to be released from the initial stage of use, thereby improving the user experience.

[0139] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A nonwoven fabric, characterized by, The nonwoven fabric is used in oral products, and the nonwoven fabric includes a fiber matrix, a first adhesive and a second adhesive; wherein the first adhesive is aminopolysaccharide-organic acid gel particles.

2. The nonwoven fabric according to claim 1, characterized in that, In the aminopolysaccharide-organic acid gel particles, the mass ratio of aminopolysaccharide to organic acid is 4:1 to 5:

1.

3. The nonwoven fabric according to claim 2, characterized in that, The aminopolysaccharide has a molecular weight of 50-100 kDa and a degree of deacetylation greater than or equal to 85%.

4. The nonwoven fabric according to claim 3, characterized in that, The aminopolysaccharide-organic acid gel particles have a particle size of 2-8 micrometers and a relative standard deviation of particle size distribution of less than or equal to 15%.

5. The nonwoven fabric according to claim 4, characterized in that, The aminopolysaccharide includes one of chitosan, modified chitosan, chitosan oligosaccharide, and deacetylated chitin, and the organic acid includes one of citric acid, lactic acid, malic acid, and succinic acid.

6. The nonwoven fabric according to claim 1, characterized in that, The nonwoven fabric comprises the following components in parts by weight: The fiber matrix, 70-85 parts; The first adhesive, 10-25 parts; The second adhesive, 5 to 10 parts.

7. The nonwoven fabric according to any one of claims 1 to 6, characterized in that, The nonwoven fabric includes functional additives, and the functional additives are present in parts by weight of 0 to 5 parts. The functional additives include at least one of cooling agents, sweeteners, and active ingredients.

8. The nonwoven fabric according to any one of claims 1 to 6, characterized in that, The nonwoven fabric includes a dispersing agent, wherein the dispersing agent is present in parts by weight of 0 to 0.5 parts.

9. A method for producing a nonwoven fabric, characterized by include: Prepare the following components according to a predetermined weight ratio: fiber matrix, first adhesive and second adhesive; wherein, the first adhesive is aminopolysaccharide-organic acid gel particles; The first adhesive and the second adhesive are added to the fiber matrix according to the specified proportions, and the nonwoven fabric is obtained according to the nonwoven fabric forming process.

10. A chewable product characterized in that, The nonwoven fabric includes any one of claims 1 to 8, wherein the nonwoven fabric comprises a fiber matrix, a first adhesive, and a second adhesive; wherein the first adhesive is an aminopolysaccharide-organic acid gel particle.

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