Composite paper sheet, fragrant paper sheet and preparation methods of composite paper sheet and fragrant paper sheet

Abstract

The invention discloses a composite paper sheet, a fragrant paper sheet and preparation methods of the composite paper sheet and the fragrant paper sheet, the composite paper sheet is formed by bonding at least two layers of paper sheets through a water-based adhesive, polyacrylamide powder is uniformly mixed in the water-based adhesive, and the upper surface and the lower surface of the composite paper sheet are coated with a polyacrylamide diluent and then dried. The polyacrylamide diluent is formed by mixing polyacrylamide and purified water. According to the composite paper sheet provided by the invention, the essence bearing capacity of the composite paper sheet is greatly improved by utilizing polyacrylamide, the diffusion speed of aroma molecules can be delayed, the aroma retention time is remarkably prolonged, and a synergistic slow-release system is formed by the surface layer and the inner layer of the composite paper sheet; a'release fault 'caused by excessively fast volatilization of surface fragrance and imbalance of internal slow release rate is effectively avoided, so that the change amplitude of the fragrance in the early stage, the middle stage and the later stage is reduced, and the stability and consistency of fragrance release are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of air freshening technology, and in particular to a composite paper sheet, a scented paper sheet, and a method for preparing both. Background Technology

[0002] With economic development and the continuous improvement of living standards, various aromatherapy products have gradually integrated into people's daily lives, not only adding fragrance to life but also bringing an artistic sensory experience. Among the many aromatherapy products, aromatherapy sheets are widely popular due to their low price and rapid initial fragrance release. However, this product also has obvious drawbacks, mainly in two aspects: firstly, the fragrance lasts for a relatively short time; and secondly, the fragrance-carrying capacity of the sheets themselves is limited, meaning the fragrance content is low.

[0003] The process by which aromatherapy sheets absorb essential oils primarily relies on their internal plant fibers. These fibers are loosely bonded, and when essential oils come into contact with the sheet, they migrate along the tiny gaps between the fibers due to capillary action—a phenomenon essentially a manifestation of intermolecular forces. While this mechanism gives aromatherapy sheets a certain absorption capacity, the weak binding force of the fiber structure to the essential oils limits the total amount absorbed. Furthermore, the essential oils are more volatile, resulting in significant variations in fragrance intensity throughout the initial, middle, and later stages of release. This lack of stability and consistency affects the longevity and effectiveness of the aromatherapy sheets, which typically lose their noticeable fragrance within about 10 days, leading to a short lifespan. Therefore, there is still a lack of aromatherapy products on the market that can provide long-lasting fragrance. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a composite paper sheet, a scented paper sheet, and a method for preparing both, aiming to solve the problems of low fragrance content and short fragrance dissipation time in the prior art.

[0005] The objective of this invention is achieved through the following technical solution: In a first aspect, the present invention provides a composite paper sheet, which is formed by bonding at least two layers of paper sheets together with an aqueous adhesive, wherein polyacrylamide powder is uniformly mixed in the aqueous adhesive, and a polyacrylamide diluent is coated on the upper and lower surfaces of the composite paper sheet and then dried, wherein the polyacrylamide diluent is a mixture of polyacrylamide and purified water.

[0006] Furthermore, the mass ratio of the water-based adhesive to the polyacrylamide powder is 99.95-99.9:0.05-0.1; Furthermore, in the polyacrylamide diluent, the mass ratio of polyacrylamide to purified water is 99.95-99.9:0.05-0.1.

[0007] Furthermore, the composite paper sheet is made of eight layers of paper sheets bonded together with a water-based adhesive.

[0008] Secondly, the present invention also provides a method for preparing a composite paper sheet, wherein the composite paper sheet is composed of at least two layers of paper sheets, and the preparation method includes the following steps: (1) Add polyacrylamide powder to the water-based adhesive and stir evenly; (2) Polyacrylamide was added to pure water and diluted thoroughly to prepare a homogeneous and stable polyacrylamide diluent; (3) The water-based adhesive mixed with polyacrylamide powder obtained in step (1) is evenly coated between the two paper sheets and bonded to obtain a multi-layered composite paper sheet. (4) The polyacrylamide dilution obtained in step (2) is evenly sprayed onto both surfaces of the composite paper to form a thin and uniform liquid film. Then the composite paper is dried to remove the moisture in the liquid film.

[0009] Furthermore, in step (1), the mass ratio of the water-based adhesive to the polyacrylamide powder is 99.95-99.9:0.05-0.1; in step (2), the mass ratio of the polyacrylamide to the purified water is 99.95-99.9:0.05-0.1.

[0010] Furthermore, in step (1), a high-speed mixer is used to mix the polyacrylamide powder and the water-based adhesive evenly. The mixing speed is controlled at 800-1200 r / min, the mixing temperature is controlled at 25-30℃, and the mixing time is controlled at 30-45 min. During the mixing process, the mixer is stopped every 10 min to observe the dispersion state of the polyacrylamide powder in the water-based adhesive to ensure that there are no obvious agglomerated particles.

[0011] Furthermore, in step (2), polyacrylamide and purified water are stirred evenly in a stirring dissolving tank, with the stirring speed controlled at 300-500 r / min, the stirring temperature controlled at 25-30℃, and the stirring time controlled at 60-90 min.

[0012] Furthermore, in step (2), pure water is first added to the mixing tank, and after stirring is started, polyacrylamide is slowly and uniformly added. The addition speed of polyacrylamide is controlled at ≤5g / min to avoid agglomeration.

[0013] Furthermore, in step (2), after preparing the polyacrylamide diluent, it is first filtered using a 100-mesh filter, and then allowed to stand for 30-60 minutes before the viscosity is tested. The viscosity at 25°C should be 20-30 mPa·s.

[0014] Furthermore, in step (4), the composite paper obtained in step (3) is weighed first, and then the polyacrylamide diluent obtained in step (2) is sprayed onto both surfaces of the composite paper using a double-sided synchronous spraying method. After spraying, the weight of the polyacrylamide diluent on the composite paper is controlled at 32%-35% of the total weight.

[0015] Furthermore, in step (4), during the drying process, the composite paper sheet is first dried for 1-2 minutes using a medium-temperature slow-speed air at a temperature of 50-60℃ and a wind speed of 1-1.5m / s. This step can remove 60%-70% of the moisture on the composite paper sheet, avoiding uneven shrinkage of the surface film (i.e., liquid film) caused by subsequent high temperature. Then, the composite paper sheet is dried for 2-3 minutes using a high-temperature low-speed air at a temperature of 70-80℃ and a wind speed of 1.5-2m / s. In this step, the use of high temperature and high wind speed can ensure that the moisture content on the treated composite paper sheet is ≤1.5%. Finally, the composite paper sheet is cooled for 1-2 minutes using a low-temperature slow-speed air at a temperature of 30-40℃ and a wind speed of 1-1.5m / s.

[0016] Thirdly, the present invention also provides a method for preparing incense paper, comprising the following steps: S1. Mix the fragrance oil and antioxidant at a weight ratio of 6400:1 until homogeneous to form a fragrance mixture; S2. After immersing the composite paper sheet in a fragrance mixture to impart fragrance, a scented paper sheet is obtained, which is then sealed and packaged. The composite paper sheet is prepared using the composite paper sheet described in any one of the first aspects or the preparation method described in any one of the second aspects.

[0017] Fourthly, the present invention also provides a fragrant paper sheet, which is prepared by the fragrant paper sheet preparation method described in the third aspect.

[0018] Compared with existing technical solutions, the present invention has the following advantages: Firstly, this invention adds polyacrylamide to the water-based adhesive of the two-layer paper sheets. This substance can achieve highly efficient adsorption of fragrance oils, with an adsorption capacity of up to 1.5 times its own weight, significantly improving the fragrance carrying capacity of the composite paper sheets, i.e., increasing the fragrance absorption capacity of the composite paper sheets. Moreover, as a highly efficient thickener, the linear polymer chains of polyacrylamide will intertwine with each other in an aqueous environment through hydrogen bonds and van der Waals forces, thereby forming a stable three-dimensional network structure. This structure can significantly increase the viscosity of the fragrance oil system, slow down the movement rate of molecules inside the liquid, and stably "bind" the fragrance molecules in the viscous matrix. In this state, the fragrance molecules cannot diffuse into the air quickly, but can only be released gradually with the slow flow of the matrix or a small amount of volatilization. More fragrance molecules can remain on the surface and near the surface of the matrix and continue to be released outward. In this way, with the thickening effect of polyacrylamide, the diffusion rate of fragrance molecules is slowed down, achieving a slow-release effect, effectively avoiding the problem of "internal fragrance waste and insufficient external fragrance retention", and ultimately achieving a significant extension of the fragrance retention time.

[0019] Secondly, after coating the upper and lower surfaces of the composite paper with a diluted polyacrylamide solution and drying it, the moisture in the diluted polyacrylamide solution is removed, leaving trace amounts of polyacrylamide in the micropores and gaps on both surfaces of the composite paper. The purpose is to regulate the evaporation rate of the fragrance on the upper and lower surfaces of the composite paper. This treatment enables the surface and inner layers of the composite paper to form a synergistic slow-release system, effectively avoiding the "release gap" caused by the imbalance between the rapid evaporation of the fragrance on the surface and the slow-release rate inside. This reduces the variation in fragrance in the early, middle and late stages, ensuring the stability and consistency of fragrance release. Detailed Implementation

[0020] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the embodiments described below are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used in this specification of embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. As used in this specification of embodiments of the invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] All raw materials involved in this invention can be purchased directly from the market. For process parameters not specifically specified, conventional techniques can be used as a reference.

[0024] Example 1 This embodiment provides a composite paper sheet, which is formed by bonding at least two layers of paper sheets together with an aqueous adhesive. The aqueous adhesive contains polyacrylamide powder uniformly. After coating the upper and lower surfaces of the composite paper sheet with a diluted polyacrylamide solution and drying it, the water in the diluted polyacrylamide solution is removed. This leaves trace amounts of polyacrylamide in the micropores and gaps on both surfaces of the composite paper sheet. The purpose is to regulate the fragrance evaporation rate of the upper and lower surfaces of the composite paper sheet. This treatment enables the surface and inner layers of the composite paper sheet to form a synergistic slow-release system, effectively avoiding the "release gap" caused by the imbalance between the rapid evaporation of the fragrance on the surface and the slow-release rate inside. This reduces the variation range of the fragrance in the early, middle and late stages, ensuring the stability and consistency of the fragrance release.

[0025] Optionally, the mass ratio of water-based adhesive to polyacrylamide powder is 99.95-99.9:0.05-0.1. This ratio can ensure the viscosity of the water-based adhesive while increasing the amount of fragrance absorbed and the slow-release fragrance, thus achieving a relatively balanced effect in all aspects. If the proportion of polyacrylamide powder is too high, it will easily lead to abnormal viscosity of the adhesive, while if the proportion of polyacrylamide powder is too low, it will affect the slow-release effect during subsequent fragrance dissipation.

[0026] Optionally, the polyacrylamide diluent is composed of polyacrylamide and purified water, and the mass ratio of polyacrylamide to purified water in the polyacrylamide diluent is 99.95-99.9:0.05-0.1, and the polyacrylamide here is also in powder form.

[0027] Optionally, the polyacrylamide may be nonionic polyacrylamide, anionic polyacrylamide, or amphoteric polyacrylamide, etc.

[0028] Optionally, the particle size of the polyacrylamide powder is 100 to 150 mesh. By controlling the particle size of the polyacrylamide powder, it can be fully dispersed in the water-based adhesive without affecting the adhesiveness of the water-based adhesive. Furthermore, when applied between paper sheets, the unevenness of the paper contact surface is not caused by too much difference in the particle size of the polyacrylamide powder. Secondly, the particle size of this polyacrylamide facilitates its dissolution in pure water and avoids the problem of agglomeration during the dissolution process. Moreover, during the drying process to remove moisture, the polyacrylamide remains in the micropores and gaps on the surface of the composite paper sheet.

[0029] Optionally, the paper sheet is absorbent cotton paper, which can absorb fragrance oils. Combining it with polyacrylamide to make a composite paper sheet can increase the fragrance oil content in the composite paper sheet. The paper sheet can be cut into the required size according to production needs. The paper sheet includes, but is not limited to, the following commercially available raw materials: absorbent cotton paper from Shenzhen Yawei Packaging Products Co., Ltd.

[0030] Optionally, the water-based adhesive may be a polyvinyl alcohol-based water-based adhesive, an ethylene acetate-based water-based adhesive, an acrylic-based water-based adhesive, a polyurethane-based water-based adhesive, an epoxy-based water-based adhesive, a phenolic-based water-based adhesive, an organosilicon-based water-based adhesive, or a rubber-based water-based adhesive.

[0031] In one embodiment, the composite paper sheet is made of eight layers of paper sheets bonded together with a water-based adhesive. Through actual fragrance absorption verification, the fragrance content of the eight-layer composite paper sheet containing polyacrylamide increased from 2.5g to 4g compared to the eight-layer composite paper sheet without polyacrylamide. This means that the polyacrylamide absorbs 1.5g of essential oil, increasing the fragrance content by 60%. Furthermore, by utilizing the water-absorbing and thickening properties of polyacrylamide, it can act as a slow-release layer for fragrance, extending the fragrance duration from about 10 days to 25 to 30 days, which is 2.5 to 3 times longer than before.

[0032] The preparation method of the above-mentioned composite paper sheet specifically includes the following steps: Step 1: Add polyacrylamide powder to the water-based adhesive and stir evenly, wherein the mass ratio of water-based adhesive to polyacrylamide powder is 99.95-99.9:0.05-0.1.

[0033] Optionally, a high-speed mixer is used to mix the polyacrylamide powder and the water-based adhesive evenly. The mixing speed is controlled at 800-1200 r / min, the mixing temperature is controlled at 25-30℃ to avoid denaturation of the water-based adhesive due to high temperature, and the mixing time is controlled at 30-45 min. During the mixing process, the mixer is stopped every 10 min to observe the dispersion state of the polyacrylamide powder in the water-based adhesive until there are no obvious agglomerated particles. The mixed system is a uniform milky white fluid.

[0034] Step 2: Add polyacrylamide to purified water for thorough dilution to prepare a uniform and stable polyacrylamide diluted solution. The mass ratio of polyacrylamide to purified water is 99.95-99.9:0.05-0.1, and the polyacrylamide used here is also in powder form.

[0035] Optionally, a stirring tank is used to mix polyacrylamide and purified water evenly. The stirring speed is controlled at 300-500 r / min, the stirring temperature is controlled at 25-30℃, and the stirring time is controlled at 60-90 min to ensure that the powder is completely dissolved and there are no visible particles.

[0036] Optionally, when stirring, first add purified water to the mixing tank, start stirring, and then slowly and evenly add polyacrylamide (i.e., polyacrylamide powder). Control the addition speed of polyacrylamide to ≤5g / min to avoid the problem of polyacrylamide powder agglomeration due to excessive addition speed and inability to dissolve in time.

[0037] Optionally, to further avoid the presence of micro-agglomerates in the diluent, after preparing the polyacrylamide diluent, it is first filtered through a 100-mesh filter to remove any possible residual micro-agglomerates. After standing and aging for 30-60 minutes, the viscosity of the polyacrylamide diluent is tested. A viscosity of 20-30 mPa·s at 25°C is acceptable, ensuring that the polyacrylamide diluent is uniform and stable, without stratification or precipitation.

[0038] The first and second steps in the above process can be performed simultaneously.

[0039] Step 3: Apply the water-based adhesive mixed with polyacrylamide powder obtained in Step 1 evenly between the two paper sheets and bond them together to obtain a multi-layered composite paper sheet. That is, evenly apply the water-based adhesive prepared in Step 1 to cover the surface of the paper sheet without any missed areas or air bubbles, and then stack and bond the two paper sheets together. Continue to bond the paper sheets layer by layer in this way until the required number of composite paper sheets is reached, such as obtaining an eight-layer composite paper sheet.

[0040] Step 4: The diluted polyacrylamide solution obtained in Step 2 is evenly sprayed onto both surfaces of the composite paper to form a thin and uniform liquid film. The composite paper is then dried to remove moisture from the liquid film, leaving trace amounts of polyacrylamide in the micropores and gaps on both surfaces. This is to regulate the evaporation rate of the fragrance on both surfaces of the composite paper. This treatment allows the surface and inner layers of the composite paper to form a synergistic slow-release system, effectively avoiding the "release gap" caused by the imbalance between the rapid evaporation of the fragrance on the surface and the slow-release rate inside. This reduces the variation in fragrance in the early, middle, and late stages, ensuring the stability and consistency of fragrance release.

[0041] Optionally, before spraying the polyacrylamide diluent, the composite paper obtained in step three is weighed to obtain its initial weight. Then, the polyacrylamide diluent obtained in step two is sprayed onto both surfaces of the composite paper using a double-sided synchronous spraying method. The composite paper is weighed immediately after spraying to obtain its total weight. That is, the weight change of the composite paper is monitored in real time before and after spraying by weighing. Ultimately, the weight of the polyacrylamide diluent on the composite paper is controlled to be 32%-35% of the total weight (i.e., the sum of the weights of the composite paper and the polyacrylamide diluent). During this process, the amount of polyacrylamide diluent sprayed is controlled to avoid the problem of excessive polyacrylamide diluent. That is, the weight of the polyacrylamide diluent sprayed is controlled to be about 47-53% of the initial weight of the composite paper, so that the weight of the polyacrylamide diluent on the composite paper is controlled to be 32%-35% of the total weight.

[0042] The above-mentioned method of simultaneous double-sided spraying ensures that the amount of polyacrylamide diluent sprayed on both surfaces of the composite paper is basically the same, avoiding large differences in the amount of sprayed on the two surfaces, which would lead to different slow-release rates and thus affect the fragrance dispersing effect and the overall performance.

[0043] Optionally, during drying, the composite paper sheets are dried sequentially using medium-temperature slow-speed air, high-temperature low-speed air, and low-temperature slow-speed air. First, the composite paper sheets are dried for 1-2 minutes using medium-temperature slow-speed air at 50-60℃ and a wind speed of 1-1.5m / s. This step removes 60%-70% of the moisture from the composite paper sheets, preventing uneven shrinkage of the surface film (i.e., liquid film) caused by subsequent high temperatures. Then, the composite paper sheets are dried for 2-3 minutes using high-temperature low-speed air at 70-80℃ and a wind speed of 1.5-2m / s. This step utilizes high... A gentle, relatively high wind speed ensures that the moisture content of the processed composite paper is ≤1.5%. Finally, a low-temperature, slow-speed airflow of 30-40℃ and 1-1.5m / s is used to cool the composite paper for 1-2 minutes to reduce its temperature from high to low, preventing deformation of the finished product when stacked at high temperatures. This step-by-step drying process removes moisture from the liquid film and leaves polyacrylamide residue in the micropores and gaps on the surface of the composite paper while preventing high temperatures from damaging its structure.

[0044] Example 2 This embodiment provides a method for preparing incense paper, including the following steps: S1. Mix the fragrance oil and antioxidant at a weight ratio of 6400:1 until homogeneous to form a fragrance mixture; S2. The composite paper sheet from Example 1 is soaked in a fragrance mixture to obtain a scented paper sheet, which is then sealed and packaged.

[0045] Optionally, the fragrance oils include, but are not limited to, rose essential oil, lavender essential oil, lemon essential oil, or sweet orange essential oil.

[0046] Optionally, the antioxidant is at least one of butylated hydroxytoluene, butylated hydroxytoluene (BHT), and butylated hydroxyanisole (BHA). The antioxidant is dissolved in the fragrance oil in advance to prevent the fragrance oil from deteriorating.

[0047] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A composite paper sheet, characterized in that, It is made of at least two layers of paper bonded together with a water-based adhesive, wherein polyacrylamide powder is uniformly mixed in the water-based adhesive, and a polyacrylamide diluent is coated on the upper and lower surfaces of the composite paper and then dried. The polyacrylamide diluent is a mixture of polyacrylamide and purified water.

2. The composite paper sheet according to claim 1, characterized in that, The mass ratio of the water-based adhesive to the polyacrylamide powder is 99.95-99.9:0.05-0.1; the mass ratio of polyacrylamide to purified water in the polyacrylamide diluent is 99.95-99.9:0.05-0.

1.

3. A method for preparing a composite paper sheet, wherein the composite paper sheet is composed of at least two layers of paper sheets, characterized in that, The preparation method includes the following steps: (1) Add polyacrylamide powder to the water-based adhesive and stir evenly; (2) Polyacrylamide was added to pure water and diluted thoroughly to prepare a homogeneous and stable polyacrylamide diluent; (3) The water-based adhesive containing polyacrylamide powder obtained in step (1) is evenly coated between the two paper sheets and bonded to obtain a multi-layered composite paper sheet. (4) The polyacrylamide dilution obtained in step (2) is evenly sprayed onto both surfaces of the composite paper to form a thin and uniform liquid film. Then the composite paper is dried to remove the moisture in the liquid film.

4. The method for preparing the composite paper sheet according to claim 3, characterized in that, In step (1), the mass ratio of the water-based adhesive to the polyacrylamide powder is 99.95-99.9:0.05-0.1; in step (2), the mass ratio of the polyacrylamide to the purified water is 99.95-99.9:0.05-0.

1.

5. The method for preparing the composite paper sheet according to claim 3, characterized in that, In step (1), a high-speed mixer is used to mix the polyacrylamide powder and the water-based adhesive evenly. The mixing speed is controlled at 800-1200 r / min, the mixing temperature is controlled at 25-30℃, and the mixing time is controlled at 30-45 min. During the mixing process, the mixer is stopped every 10 min to observe the dispersion state of the polyacrylamide powder in the water-based adhesive to ensure that there are no obvious agglomerated particles.

6. The method for preparing the composite paper sheet according to claim 3, characterized in that, In step (2), polyacrylamide and purified water are stirred evenly in a stirring dissolving tank. The stirring speed is controlled at 300-500 r / min, the stirring temperature is controlled at 25-30℃, and the stirring time is controlled at 60-90 min. When stirring, the purified water is added to the stirring dissolving tank first. After stirring is started, polyacrylamide is added slowly and evenly. The feeding rate of polyacrylamide is controlled at ≤5g / min to avoid agglomeration.

7. The method for preparing the composite paper sheet according to any one of claims 3-6, characterized in that, In step (2), after preparing the polyacrylamide diluent, it is first filtered with a 100-mesh filter, and then allowed to stand for 30-60 minutes before the viscosity is tested. The viscosity at 25°C should be 20-30 mPa·s.

8. The method for preparing the composite paper sheet according to claim 3, characterized in that, In step (4), the composite paper obtained in step (3) is weighed first, and then the polyacrylamide diluent obtained in step (2) is sprayed onto both surfaces of the composite paper using a double-sided synchronous spraying method. After spraying, the weight of the polyacrylamide diluent on the composite paper is controlled at 32%-35% of the total weight.

9. The method for preparing the composite paper sheet according to claim 3, characterized in that, In step (4), during the drying process, the composite paper sheet is first dried with medium-temperature slow air at a temperature of 50-60℃ and a wind speed of 1-1.5m / s for 1-2 minutes; then, the composite paper sheet is dried with high-temperature low-speed air at a temperature of 70-80℃ and a wind speed of 1.5-2m / s for 2-3 minutes; finally, the composite paper sheet is cooled with low-temperature slow air at a temperature of 30-40℃ and a wind speed of 1-1.5m / s for 1-2 minutes.

10. A method for preparing incense paper, characterized in that, Includes the following steps: S1. Mix the fragrance oil and antioxidant at a weight ratio of 6400:1 until homogeneous to form a fragrance mixture; S2. After immersing the composite paper sheet in a fragrance mixture to impart fragrance, a scented paper sheet is obtained, which is then sealed and packaged. The composite paper sheet is prepared using the composite paper sheet as described in any one of claims 1-2 or the preparation method as described in any one of claims 3-9.