Method for preparing cigarette sheet fiber slurry using citrus peel, and product and application thereof

Abstract

The present application relates to a kind of cigarette sheet fiber slurry prepared from citrus peel and its product and application.The method comprises the following steps: (1) citrus peel raw material is rehydrated, then mixed with enzyme to carry out enzymatic reaction, to obtain enzymatic product; (2) the enzymatic product is treated by steam explosion under the action of saturated water vapor; (3) the citrus peel after steam explosion is beaten, to obtain cigarette sheet fiber slurry.The method realizes the complete replacement of traditional wood pulp fiber by citrus peel fiber, strengthens the self-binding force of fiber slurry, promotes the stable interweaving of fibers into net, and provides special citrus flavor at the same time;The cigarette sheet processed has excellent mechanical properties and smoking experience.

Description

Technical Field

[0001] This invention belongs to the field of tobacco product technology, specifically relating to a method for preparing cigarette sheet fiber pulp using citrus peel, its products, and applications. Background Technology

[0002] Heated cigarette sheets are a new type of tobacco sheet, and their preparation methods mainly include the slurry method, the roll pressing method, and the papermaking method. The slurry method involves grinding tobacco raw materials into powder, mixing it with adhesives, humectants, and wood pulp fibers, and then thoroughly stirring and homogenizing it to form a slurry, which is then spread and dried into sheets. To ensure good formability and processability of the tobacco sheets, a certain amount of wood pulp fibers needs to be added to the slurry to impart the necessary mechanical strength. Studies have shown that when the wood pulp fiber content is 2%-5%, the mechanical strength of the heated cigarette sheet increases with the increase of wood pulp content, and the tensile index can reach up to 3.62 N·m / g; when the freeness of the wood pulp fibers is 49°SR, the mechanical properties of the heated cigarette sheet are relatively good. However, due to processing limitations, the amount of wood pulp fiber added is usually no more than 5% by mass, resulting in tobacco sheets with low strength. The tensile strength and bursting strength of the sheets often fail to fully meet the requirements of subsequent shredding and agglomeration processes. When the amount of wood pulp fiber added is high, the fibers are prone to entanglement and the thick pulp is not evenly dispersed, which can lead to problems such as poor uniformity of the formed tobacco sheets.

[0003] Citrus peels are rich in pectin, cellulose, and hemicellulose, as well as a large amount of flavonoids (such as hesperidin and noriheptacorlin) and limonene, which give them a unique aroma. They have traditional medicinal properties such as regulating qi, strengthening the spleen, and resolving dampness and phlegm. However, currently, apart from a small amount used for extracting pectin or making dried tangerine peel, most citrus peels are still discarded as waste or simply landfilled.

[0004] As a raw material for heated cigarette sheets produced using the slurry method, citrus peel fiber differs fundamentally from wood pulp fiber: wood pulp fiber is primarily cellulose, with long, thin, flexible fibers and good interweaving properties; while citrus peel fiber contains higher levels of pectin and hemicellulose, resulting in relatively short and thick fibers with a relatively low lignin content. This short and thick fiber structure leads to fewer mechanical interweaving points and weaker hydrogen bonds, resulting in a loose fiber network structure that is difficult to independently withstand external forces. Previous studies have shown that simply mixing wood pulp fiber and fruit peel fiber as a raw material for heated cigarette sheets using the slurry method is insufficient. This method suffers from low cellulose polymerization, inadequate fiber specific surface area, and a limited number of surface-active hydroxyl groups, failing to fundamentally solve the two core problems of poor mechanical properties and difficulty in forming a stable fiber network in citrus peel fiber.

[0005] Therefore, processing citrus peel raw materials and developing a method for preparing cigarette sheet fiber pulp using citrus peel, establishing efficient inter-fiber bonding and constructing a stable three-dimensional fiber network structure within the citrus peel fibers, so that the fibers can completely replace traditional wood pulp fibers, has become one of the technical problems that urgently need to be solved. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method for preparing cigarette sheet fiber pulp using citrus peel, as well as its products and applications.

[0007] In a first aspect, the present invention provides a method for preparing cigarette sheet fiber pulp using citrus peel, the method comprising the following steps: (1) The citrus peel raw material is rehydrated and then mixed with enzymes to carry out enzymatic hydrolysis to obtain the enzymatic hydrolysis product; (2) The enzymatic hydrolysis products are subjected to steam explosion treatment under the action of saturated water vapor; (3) The citrus peel after steam explosion is pulped to obtain cigarette sheet fiber pulp.

[0008] On the one hand, this invention partially hydrolyzes the adhesive substances between fiber bundles by enzymatic hydrolysis and steam explosion treatment of rehydrated citrus peel, significantly weakening the lateral bonding force of fiber cell walls and greatly reducing the "binding" of each fiber. During the dissociation process, the fiber surface is activated by the "explosion" shock wave, exposing a large number of fiber microfibrils and active hydroxyl groups, effectively increasing the free binding energy and hydrogen bond binding sites of the fibers, making it easier for hydrogen bonds to form when the fibers come into contact. At the same time, the citrus peel fibers after steam explosion treatment are more easily dispersed into individual fibers during pulping, further increasing the roughness of the fiber surface and forming a large number of filament structures. This not only increases the specific surface area but also increases the probability of mechanical interweaving between fibers, strengthening the self-bonding force of the fibers.

[0009] On the other hand, the citrus peel after steam explosion is pulped, and after pulping, the fibers form a stable three-dimensional network structure through hydrogen bonding and physical interweaving. In the thick pulp, the density of hydrogen bond crosslinking between fibers is significantly increased, the compactness of the network structure is significantly enhanced, and the average number of fiber bonding points is also significantly increased, which promotes the stable interweaving of fibers into a network from multiple aspects.

[0010] Furthermore, the preparation method of this invention effectively preserves the characteristic components and aromatic functions of citrus peel. The enzymatic hydrolysis, steam explosion, and other processes have a high retention rate of flavonoids, limonene, and other components in citrus peel. The treated citrus peel fiber can provide a special aged aroma and certain antioxidant functions for heated cigarette sheets. Moreover, the steam explosion treatment can increase the dissolution of bioactive substances such as polyphenols and flavonoids, which is more conducive to the release of functional components during the heating process and improves the smoking experience of cigarettes.

[0011] Preferably, the citrus peel raw material in step (1) includes dried tangerine peel raw material and / or fresh citrus peel raw material, preferably a combination of dried tangerine peel raw material and fresh citrus peel raw material.

[0012] This invention creatively discovers that by simultaneously enzymatically hydrolyzing and steam-exploding dried tangerine peel and fresh citrus peel, the resulting cigarette sheet fiber pulp exhibits stronger fiber bonding and a more stable interwoven network structure, thus enabling the production of cigarette sheets with superior mechanical properties. Furthermore, cigarette sheets processed using both dried tangerine peel and fresh citrus peel as raw materials possess better fruity aroma, smoother texture, and a superior smoking experience.

[0013] Preferably, the dried tangerine peel is obtained by drying fresh citrus peel at 40-50℃ until the moisture content is below 13%, and then aging it for more than 3 years at a temperature of 20-30℃ and a relative humidity of below 60%RH.

[0014] The aging process must be carried out in a cool, dry, and well-ventilated place.

[0015] Specific point values ​​for the 40-50℃ range can be 40℃, 42℃, 44℃, 46℃, 48℃, 50℃, etc.; specific point values ​​for the 20-30℃ range can be 20℃, 22℃, 24℃, 26℃, 28℃, 30℃, etc.; values ​​below 13% can be 13%, 12%, 11%, 10%, 9%, 8%, etc.; values ​​below 60%RH can be 60%RH, 55%RH, 50%RH, 45%RH, 40%RH, etc.; and values ​​above 3 years can be 3 years, 4 years, 5 years, 6 years, etc.

[0016] Preferably, the mass ratio of the dried tangerine peel raw material to the fresh citrus peel raw material is 3:1-8:1, for example, it can be 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, etc.

[0017] Preferably, after the rehydration treatment in step (1), the moisture content of the citrus peel is 25%-60%, for example, it can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc.

[0018] Preferably, the enzyme in step (1) includes cellulase and / or hemicellulase, and more preferably a combination of cellulase and hemicellulase.

[0019] This invention utilizes the aforementioned composite enzyme to degrade cellulose and hemicellulose between fiber bundles, weakening the lateral bonding force of fiber cell walls and making it easier for hydrogen bonds to form between fibers, thereby improving the self-binding force of the fibers. Furthermore, this invention creatively discovers that cellulase and hemicellulase have a significant synergistic effect in weakening the bonding force of fiber cell walls, improving the self-binding force of the prepared pulp fibers, and releasing the characteristic components and aromatic functions of citrus peel.

[0020] Preferably, the mass ratio of cellulase to hemicellulase is 5:1 to 1:5, for example, it can be 5:1, 3:1, 1:1, 1:3, 1:5, etc.

[0021] Preferably, the mass of the enzyme in step (1) accounts for 0.01%-3% of the mass of the citrus peel after rehydration treatment, for example, it can be 0.01%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, etc.

[0022] Preferably, the temperature of the enzymatic hydrolysis reaction is 45-55℃; and the time of the enzymatic hydrolysis reaction is 60-180 min.

[0023] Specific point values ​​within the 45-55℃ range can be selected from 45℃, 48℃, 50℃, 53℃, 55℃, etc., and specific point values ​​within the 60-180 min range can be selected from 60 min, 90 min, 120 min, 150 min, 180 min, etc.

[0024] Preferably, the pressure of the steam explosion treatment in step (2) is 0.5-1.5 MPa, more preferably 0.6-1.2 MPa; the holding time of the steam explosion treatment is 60-240 s, more preferably 90-180 s; and the temperature of the steam explosion treatment is 160-210℃, which is determined by the saturated steam pressure.

[0025] Specific point values ​​within the 0.5-1.5 MPa range can be 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1 MPa, 1.1 MPa, 1.2 MPa, 1.3 MPa, 1.4 MPa, 1.5 MPa, etc., while specific point values ​​within the 60-240 s range can be 60 s, 90 s, 120 s, 150 s, 180 s, 210 s, 240 s, etc.

[0026] By controlling the parameters of steam explosion within the aforementioned range, this invention can better treat the enzymatic hydrolysis products of citrus peels, improve the binding force and web-forming ability of the prepared fiber pulp, and at the same time better release functional components, thus enhancing the suction experience.

[0027] Preferably, the pulping process in step (3) includes: mixing the material after steam explosion with water to obtain a suspension with a concentration of 1%-5%, and then performing pulping.

[0028] Preferably, the degree of beating after pulping is 20-50°SR.

[0029] Among them, the specific point values ​​in 1%-5% can be 1%, 2%, 3%, 4%, 5%, etc., and the specific point values ​​in 20-50°SR can be 20°SR, 30°SR, 40°SR, 50°SR, etc.

[0030] In a second aspect, the present invention provides a cigarette sheet fiber pulp prepared by the method described in the first aspect.

[0031] Thirdly, the present invention provides a cigarette sheet, the raw materials for preparing the cigarette sheet including the cigarette sheet fiber pulp, tobacco dust, humectant and optional adhesive described in the second aspect.

[0032] Preferably, the moisturizer includes glycerin.

[0033] Preferably, the adhesive comprises any one or a combination of at least two of sodium carboxymethyl cellulose, sodium alginate, guar gum, or xanthan gum.

[0034] Preferably, the raw materials for preparing the cigarette sheet include 80-100 parts of the cigarette sheet fiber pulp, 60-90 parts of tobacco dust, 1-5 parts of humectant, and 0-2 parts of adhesive as described in the second aspect.

[0035] Among them, the specific point values ​​for 80-100 portions can be 80 portions, 85 portions, 90 portions, 95 portions, 100 portions, etc.; the specific point values ​​for 20-50 portions can be 20 portions, 25 portions, 30 portions, 35 portions, 40 portions, 45 portions, 50 portions, etc.; the specific point values ​​for 1-5 portions can be 1 portion, 2 portions, 3 portions, 4 portions, 5 portions, etc.; and the specific point values ​​for 0.5-2 portions can be 0.5 portions, 1 portion, 1.5 portions, 2 portions, etc.

[0036] Fourthly, the present invention provides a method for preparing cigarette sheets as described in the third aspect, the method comprising: Cigarette sheet is obtained by mixing cigarette sheet fiber pulp, tobacco dust, humectant and optional adhesive, and processing it through a slurry method.

[0037] Preferably, when processing by the slurry method, the water content of the slurry is controlled to be 85%-93% and the slurry temperature is 25-40℃.

[0038] Among them, the specific point values ​​in the 85%-93% range can be 85%, 87%, 89%, 91%, 93%, etc., and the specific point values ​​in the 25-40℃ range can be 25℃, 30℃, 35℃, 40℃, etc.

[0039] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention uses citrus peel as the fiber source to prepare fiber pulp. Through physical reinforcement, it solves the technical problem of poor self-cohesion of citrus peel fiber and difficulty in forming a load-bearing network independently from the structural level, realizing the complete replacement of traditional wood pulp fiber and laying the foundation for improving the tensile index of thick pulp sheet.

[0040] (2) The present invention strengthens the self-binding force of fiber pulp by enzymatic hydrolysis, steam explosion treatment and pulping treatment of rehydrated citrus peel, and promotes the stable interweaving of fibers into a network.

[0041] (3) The preparation method of the present invention is green and environmentally friendly, and does not generate wastewater, waste gas and waste residue in the process, which is environmentally friendly; and it transforms inexpensive waste into high-value-added slurry heating cigarette sheet raw material, which significantly enhances the economic value of citrus peel and provides a new high-value application path for citrus peel.

[0042] (4) The preparation method of the present invention preserves the characteristic components and aromatic functions of citrus peel very well. The enzymatic hydrolysis, steam explosion and other processes have a high retention rate of flavonoids, limonene and other components in citrus peel. The treated citrus peel fiber can provide a special aged aroma and certain antioxidant functions for heated cigarette sheets. Moreover, the steam explosion treatment can also increase the dissolution of bioactive substances such as polyphenols and flavonoids, which is more conducive to the release of functional components during the heating process and improves the smoking experience of cigarettes. Detailed Implementation

[0043] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0044] The cellulase involved in the following specific embodiments is from Cangzhou Xiasheng Enzyme Biotechnology Co., Ltd., and its brand name is FDG-2225; The hemicellulase involved in the following specific embodiments is from Cangzhou Xiasheng Enzyme Biotechnology Co., Ltd., and its brand name is FDG-0609. The wood pulp fiber used in the following specific embodiments is sourced from Henan Xinqiao Tobacco Technology Co., Ltd. The sodium alginate used in the following specific embodiments is from Shanghai Yuanye Biotechnology Co., Ltd., with product number S11053; The sodium carboxymethyl cellulose involved in the following specific embodiments is from Shanghai Yuanye Biotechnology Co., Ltd., with product number S14016; The xanthan gum used in the following specific embodiments is sourced from Shanghai Yuanye Biotechnology Co., Ltd., with product number S14016.

[0045] The dried tangerine peel described in the following specific embodiments is obtained by scraping off the white pith from mature, unrotten fresh tangerine peels, drying them at 45°C until the moisture content reaches 10%, and then placing the dried tangerine peels into earthenware jars and aging them for 3 years under cool, dry, and well-ventilated conditions at 25°C and 60% RH.

[0046] Example 1 This embodiment provides a method for preparing cigarette sheet fiber pulp, including the following steps: (1) Enzymatic hydrolysis: Dried tangerine peel and fresh tangerine peel were pretreated by removing impurities, drying and pulverizing with 40 mesh to obtain dried tangerine peel powder and fresh tangerine peel powder; the tangerine peel powder was mixed with water for rehydration treatment, and then mixed with a compound enzyme for enzymatic hydrolysis reaction to obtain enzymatic hydrolysis product; The citrus peel powder was a mixture of dried tangerine peel powder and fresh citrus peel powder in a mass ratio of 5:1; the moisture content of the citrus peel was controlled at 50% after rehydration treatment; the compound enzyme was a mixture of cellulase and hemicellulase in a mass ratio of 1:1, and the total amount of compound enzyme added was 0.5% of the mass of the citrus peel after rehydration treatment; the enzymatic hydrolysis reaction temperature was 50℃ and the time was 120 min.

[0047] (2) Steam explosion treatment: The enzymatic hydrolysis product is introduced into the steam explosion device, and saturated steam is introduced under closed conditions to carry out steam explosion treatment (the pressure of steam explosion treatment is 1 MPa, and the pressure holding time is 120 s).

[0048] (3) Pulping treatment: The material after steam explosion treatment is mixed with water to prepare a suspension with a concentration of 3%, and then pulped using a disc mill until the degree of beating is 40°SR to obtain cigarette sheet fiber pulp.

[0049] Example 2 This embodiment provides a method for preparing cigarette sheet fiber pulp, including the following steps: (1) Enzymatic hydrolysis: The tangerine peel and fresh citrus peel were pretreated by removing impurities, drying and grinding with 20 mesh to obtain tangerine peel powder and fresh citrus peel powder respectively; the citrus peel powder was mixed with water for rehydration treatment, and then mixed with a compound enzyme for enzymatic hydrolysis reaction to obtain enzymatic hydrolysis product; The citrus peel powder was a mixture of dried tangerine peel powder and fresh citrus peel powder in a 3:1 mass ratio; the moisture content of the citrus peel was controlled at 40% after rehydration treatment; the compound enzyme was a mixture of cellulase and hemicellulase in a 3:1 mass ratio, and the total amount of compound enzyme added was 0.1% of the mass of the citrus peel after rehydration treatment; the enzymatic hydrolysis reaction was carried out at a temperature of 45℃ for 150 min.

[0050] (2) Steam explosion treatment: The enzymatic hydrolysis product is introduced into the steam explosion device, and saturated steam is introduced under closed conditions to carry out steam explosion treatment (the pressure of steam explosion treatment is 0.8 MPa, and the pressure holding time is 180 s).

[0051] (3) Pulping treatment: The material after steam explosion treatment is mixed with water to prepare a suspension with a concentration of 2.8%, and then pulped using a disc mill until the degree of beating is 35°SR to obtain cigarette sheet fiber pulp.

[0052] Example 3 This embodiment provides a method for preparing cigarette sheet fiber pulp, including the following steps: (1) Enzymatic hydrolysis: The tangerine peel and fresh citrus peel were pretreated by removing impurities, drying and grinding with 60 mesh to obtain tangerine peel powder and fresh citrus peel powder respectively; the citrus peel powder was mixed with water for rehydration treatment, and then mixed with a compound enzyme for enzymatic hydrolysis reaction to obtain enzymatic hydrolysis product; The citrus peel powder was a mixture of dried tangerine peel powder and fresh citrus peel powder in a mass ratio of 8:1; the moisture content of the citrus peel was controlled at 60% after rehydration treatment; the compound enzyme was a mixture of cellulase and hemicellulase in a mass ratio of 1:3, and the total amount of compound enzyme added was 1% of the mass of the citrus peel after rehydration treatment; the enzymatic hydrolysis reaction temperature was 55℃ and the time was 90 min.

[0053] (2) Steam explosion treatment: The enzymatic hydrolysis product is introduced into the steam explosion device, and saturated steam is introduced under closed conditions to carry out steam explosion treatment (the pressure of steam explosion treatment is 1.2 MPa, and the pressure holding time is 90 s).

[0054] (3) Pulping treatment: The material after steam explosion treatment is mixed with water to prepare a suspension with a concentration of 3.2%, and then pulped using a disc mill until the degree of beating is 45°SR to obtain cigarette sheet fiber pulp.

[0055] Example 4 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Example 1 only in that the citrus peel powder in step (1) is changed to a single dried tangerine peel powder; the remaining steps are consistent with Example 1.

[0056] Example 5 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Example 1 only in that the citrus peel powder in step (1) is changed to a single fresh citrus peel powder; the remaining steps are consistent with Example 1.

[0057] Example 6 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Embodiment 1 only in that the citrus peel powder in step (1) is changed to a single grapefruit peel powder (the grapefruit peel powder is obtained by pre-treatment of fresh grapefruit peel by removing impurities, drying, and pulverizing with 40 mesh); the remaining steps are consistent with Embodiment 1.

[0058] Example 7 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Example 1 only in that the complex enzyme in step (1) is adjusted to a single cellulase; the remaining steps are consistent with Example 1.

[0059] Example 8 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Example 1 only in that the complex enzyme in step (1) is adjusted to a single hemicellulase; the remaining steps are consistent with Example 1.

[0060] Example 9 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Embodiment 1 only in that the holding time of the steam explosion treatment in step (2) is adjusted to 240 s; the remaining steps are consistent with Embodiment 1.

[0061] Example 10 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Embodiment 1 only in that the holding time of steam explosion treatment in step (2) is adjusted to 60 s; the remaining steps are consistent with Embodiment 1.

[0062] Example 11 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Embodiment 1 only in that the pressure of the steam explosion treatment in step (2) is adjusted to 1.5 MPa; the remaining steps are consistent with Embodiment 1.

[0063] Example 12 This embodiment provides a method for preparing cigarette sheet fiber pulp, which differs from Embodiment 1 only in that the pressure of the steam explosion treatment in step (2) is adjusted to 0.5 MPa; the remaining steps are consistent with Embodiment 1.

[0064] Comparative Example 1 This comparative example provides a method for preparing cigarette sheet fiber pulp, which differs from Example 1 only in that step (1) does not involve enzymatic hydrolysis, but instead directly performs steam explosion treatment on the rehydrated citrus peel material in step (2); the remaining steps are consistent with Example 1.

[0065] Comparative Example 2 This comparative example provides a method for preparing cigarette sheet fiber pulp, which differs from Example 1 only in that it does not involve blasting treatment. Instead, the enzymatic hydrolysis product obtained in step (1) is directly mixed with water and pulped according to step (3). All other steps are consistent with those in Example 1.

[0066] Comparative Example 3 This comparative example provides a method for preparing cigarette sheet fiber pulp, in which wood pulp fiber is added to water to prepare a suspension with a concentration of 3%, and the pulp is treated with a disc refiner to a freeness of 40°SR to obtain cigarette sheet fiber pulp.

[0067] Application Example 1 This application example provides a cigarette sheet prepared using the following method: By mass percentage, 1% adhesive (sodium carboxymethyl cellulose), 1% humectant (glycerin), and 70% tobacco dust were added to the cigarette sheet fiber pulp obtained in Example 1. The moisture content of the slurry was controlled at 90%, the slurry temperature was 30°C, and the mixture was stirred and homogenized at 100 rpm for 1 h. After casting and spreading, the mixture was dried at 100°C for 30 min and then shaped to obtain the slurry-processed cigarette sheet product.

[0068] Application Example 2 This application example provides a cigarette sheet prepared using the following method: By weight percentage, 0.3% adhesive (sodium alginate), 2% humectant (glycerin), and 68% tobacco dust were added to the cigarette sheet fiber pulp obtained in Example 2. The moisture content of the slurry was controlled at 85%, the slurry temperature was 25°C, and the mixture was stirred and homogenized at 150 rpm for 50 min, then cast, spread, dried at 100°C for 30 min, and finally shaped to obtain the slurry-processed cigarette sheet product.

[0069] Application Example 3 This application example provides a cigarette sheet prepared using the following method: By mass percentage, 1.5% adhesive (xanthan gum), 2% humectant (glycerin), and 65% tobacco dust were added to the cigarette sheet fiber pulp obtained in Example 3. The moisture content of the slurry was controlled at 93%, the slurry temperature was 40°C, and the mixture was stirred and homogenized at 100 rpm for 1.5 h, cast and spread, dried at 100°C for 30 min, and then shaped to obtain the slurry-processed cigarette sheet product.

[0070] Application Example 4-12 Application Examples 4-12 each provide a cigarette sheet, which differs from Application Example 1 only in that the cigarette sheet fiber pulp of Example 1 is replaced with the cigarette sheet fiber pulp of Examples 4-12 respectively, while the remaining steps are the same as those in Application Example 1.

[0071] Comparative Application Examples 1-3 Comparative Application Examples 1-3 each provide a cigarette sheet, the only difference from Application Example 1 being that the cigarette sheet fiber pulp of Example 1 is replaced with the cigarette sheet fiber pulp of Comparative Examples 1-3 respectively, while the other steps are the same as in Application Example 1.

[0072] Test Example 1 Tensile strength test: Referring to the test method in GB / T 12914 Determination of Tensile Strength of Paper and Paperboard, the sheets prepared in each application example and the comparative application example were cut into 250×15 mm specimens (the length and width error of the specimens were ±0.1 mm, the longitudinal and transverse skew angles were not greater than 5°, the cuts were neat, and there were no burrs or any damage) for tensile strength testing. Each sample was tested 14 times. The two maximum values ​​and two minimum values ​​in the test were removed, and the arithmetic mean of the remaining data was used as the final test result, which was rounded to 0.01 kN / m.

[0073] The test results are shown in Table 1 below.

[0074] Table 1 A comparison of the data from Application Example 1 and Comparative Application Example 3 shows that the cigarette sheet prepared from citrus peel raw material after enzymatic hydrolysis and explosion treatment can completely replace wood pulp fiber and has excellent tensile strength. Furthermore, a comparison of the data from Application Examples 4-6 shows that the cigarette sheet fiber pulp prepared using dried tangerine peel and fresh citrus peel as raw materials has stronger fiber bonding and a more stable interwoven network structure, thus enabling the production of cigarette sheets with superior mechanical properties. Dried tangerine peel and fresh citrus peel have a significant synergistic effect in improving tensile strength.

[0075] A comparison of the data from Application Example 1 and Comparative Application Example 1 shows that enzymatic hydrolysis of citrus peel raw materials can significantly improve the tensile strength of the prepared cigarette sheets. Furthermore, a comparison with the data from Application Examples 7-8 shows that simultaneous treatment of citrus peel raw materials with cellulase and hemicellulase can better release and activate the cellulose fibers inside the citrus peel, and the two have a good synergistic effect in improving the mechanical properties of the fiber pulp.

[0076] A comparison of the data from Application Example 1 and Comparative Application Example 2 shows that, compared to traditional mechanical processing methods, steam explosion of the material obtained after enzymatic hydrolysis of citrus peel can better improve the self-binding force of the fiber pulp, promote the stable interweaving of fibers into a web, and enhance the tensile strength of cigarette sheets. Furthermore, a comparison with the data from Application Examples 9-12 shows that controlling the steam explosion treatment parameters as pressure 0.6-1.2 MPa and holding time 90-180 s can further enhance the interweaving ability of the fiber pulp and improve the tensile strength of cigarette sheets.

[0077] Test Example 2 Sensory evaluation: The cigarette sheets obtained from each application example and the comparative application example were respectively loaded into the structure of heated cigarette sticks, and the filling amount of the cigarette sheet was controlled to be 200±20 mg / stick, resulting in 15 kinds of cigarettes loaded with different cigarette sheets.

[0078] Seven evaluators, using smoking paraphernalia with identical heating curves, conducted sensory evaluation tests on the 15 types of cigarettes listed above, based on the evaluation criteria and standards outlined in Table 2. The average score for each cigarette was taken, and the sensory evaluation results are shown in Table 3.

[0079] Table 2 Table 3 A comparison of the data from Application Example 1 and Comparative Application Example 3 shows that cigarette sheets prepared from citrus peel raw materials through enzymatic hydrolysis and explosion treatment can better retain the characteristic components and aromatic functions of citrus peel, thus improving the smoking experience, compared to cigarette sheets processed from wood pulp fiber. Furthermore, a comparison of the data from Application Examples 4-6 shows that, compared to cigarette sheets made from dried tangerine peel, fresh citrus peel, or grapefruit peel alone, cigarette sheets made from both dried tangerine peel and fresh citrus peel have a better fruity aroma and a smoother texture.

[0080] The data from Application Example 1 and Comparative Application Example 1 show that enzymatic hydrolysis of citrus peel raw materials can better release the characteristic components in citrus peel and significantly improve the smoking experience. Furthermore, the data from Application Examples 7-8 show that cellulase and hemicellulase have a significant synergistic effect in releasing the active ingredients in citrus peel.

[0081] A comparison of the data from Application Example 1 and Comparative Application Example 2 shows that, compared to traditional mechanical processing methods, steam explosion of the material obtained after enzymatic hydrolysis of citrus peel can increase the dissolution of bioactive substances such as polyphenols and flavonoids, which is more conducive to the release of functional components during the heating process of the flakes. Furthermore, a comparison with the data from Application Examples 9-12 shows that controlling the steam explosion treatment parameters to a pressure of 0.6-1.2 MPa and a holding time of 90-180 s can further improve the steam explosion effect, release functional components, and enhance the suction experience.

[0082] The applicant declares that the technical solution of this invention is illustrated by the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the products of this invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

[0083] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A method for preparing cigarette sheet fiber pulp using citrus peel, characterized in that, The method includes the following steps: (1) The citrus peel raw material is rehydrated and then mixed with enzymes to carry out enzymatic hydrolysis to obtain the enzymatic hydrolysis product; (2) The enzymatic hydrolysis products are subjected to steam explosion treatment under the action of saturated steam; (3) The citrus peel after steam explosion is pulped to obtain cigarette sheet fiber pulp.

2. The method according to claim 1, characterized in that, The citrus peel raw materials in step (1) include dried tangerine peel raw materials and / or fresh citrus peel raw materials, preferably a combination of dried tangerine peel raw materials and fresh citrus peel raw materials; Preferably, the mass ratio of the dried tangerine peel raw material to the fresh citrus peel raw material is 3:1-8:

1.

3. The method according to claim 1 or 2, characterized in that, After the rehydration treatment described in step (1), the moisture content of the citrus peel is 25%-60%.

4. The method according to any one of claims 1-3, characterized in that, The enzyme in step (1) includes cellulase and / or hemicellulase, preferably a combination of cellulase and hemicellulase; Preferably, the mass ratio of cellulase to hemicellulase is 5:1 to 1:5; Preferably, the mass of the enzyme in step (1) accounts for 0.01%-3% of the mass of the citrus peel after rehydration treatment; Preferably, the temperature of the enzymatic hydrolysis reaction is 45-55℃; the time of the enzymatic hydrolysis reaction is 60-180 min.

5. The method according to any one of claims 1-4, characterized in that, The pressure of the steam explosion treatment in step (2) is 0.5-1.5 MPa, preferably 0.6-1.2 MPa; the pressure holding time of the steam explosion treatment is 60-240 s, preferably 90-180 s.

6. The method according to any one of claims 1-5, characterized in that, The pulping process in step (3) includes: mixing the material after steam explosion with water to obtain a suspension with a concentration of 1%-5%, and then performing pulping process; Preferably, the degree of beating after pulping is 20-50°SR.

7. A cigarette sheet fiber pulp prepared by any one of claims 1-6.

8. A cigarette sheet, characterized in that, The raw materials for preparing the cigarette sheet include the cigarette sheet fiber pulp as described in claim 7, tobacco dust, humectant, and optional adhesive.

9. The cigarette sheet according to claim 8, characterized in that, The humectant includes glycerin; Preferably, the adhesive comprises any one or a combination of at least two of sodium carboxymethyl cellulose, sodium alginate, guar gum, or xanthan gum; Preferably, the raw materials for preparing the cigarette sheet include 80-100 parts of the cigarette sheet fiber pulp as described in claim 7, 60-90 parts of tobacco dust, 1-5 parts of humectant, and 0-2 parts of adhesive.

10. A method for preparing cigarette sheet as described in claim 8 or 9, characterized in that, The preparation method includes: Cigarette sheet is obtained by mixing cigarette sheet fiber pulp, tobacco dust, humectant and optional adhesive, and processing it through a slurry method.

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