Preparation method of reconstituted tobacco with improved water holding capacity

Abstract

The present invention discloses a method for preparing reconstituted tobacco leaves with improved water holding capacity, comprising: adding TSP powder and carrageenan powder to water under stirring conditions to obtain a TSP solution and a carrageenan solution; adding a fiber raw material to a tobacco raw material, performing an extraction process to obtain an extract and a solid residue; concentrating the extract to obtain a primary coating liquid; adding the TSP solution to the primary coating liquid in a preset amount to obtain a final coating liquid; drying a wet sheet base to obtain a dry sheet base; coating the dry sheet base with the final coating liquid to obtain a wet reconstituted tobacco leaf; drying the wet reconstituted tobacco leaf to obtain a dry reconstituted tobacco leaf; and spraying a carrageenan solution on the surface of the dry reconstituted tobacco leaf. The method for preparing reconstituted tobacco leaves with improved water holding capacity provided by the present invention uses TSP to improve the coating effect, so that the reconstituted tobacco leaves effectively maintain a high aroma retention capacity, and on this basis, carrageenan is applied to the reconstituted tobacco leaves to further lock in moisture.

Description

Technical Field

[0001] The present invention relates to the field of reconstituted tobacco processing, and more particularly, to a method for preparing reconstituted tobacco leaves with improved water holding capacity. Background Art

[0002] The moisture content of reconstituted tobacco leaves is one of the key indicators for inspecting reconstituted tobacco products. Too high a moisture content can easily cause the product to mold, while too low a moisture content can have a negative impact on the physical properties and sensory quality of the product. The product breakage rate will also increase due to too low a moisture content.

[0003] Water holding capacity refers to the ability to retain moisture. The water holding capacity of reconstituted tobacco refers to its ability to bind water. This capacity affects the ability of reconstituted tobacco to absorb and release moisture during production and storage, affecting its quality. Therefore, improving the water holding capacity of reconstituted tobacco and enabling it to regulate moisture is crucial.

[0004] To preserve aroma, technicians often add tamarind polysaccharide (TSP) to the coating solution. TSP can form a thermoreversible gel in the coating solution, retaining and locking in certain aroma-causing components while also retaining some water. However, the TSP gel often loses some of its aroma and water-retaining properties during the coating and baking process due to the high temperature.

[0005] Therefore, how to reduce the loss of water in a high-temperature environment and further improve the water holding capacity of reconstituted tobacco leaves has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] One object of the present invention is to provide a new technical solution for the preparation of reconstituted tobacco leaves that can effectively improve the water holding capacity.

[0007] According to a first aspect of the present invention, a method for preparing reconstituted tobacco with improved water holding capacity is provided.

[0008] The method for preparing the reconstituted tobacco leaf with improved water holding capacity comprises the following steps:

[0009] Step (1): After preheating the water, TSP powder and carrageenan powder are added to the water under stirring to obtain a TSP solution and a carrageenan solution;

[0010] Step (2): adding fiber raw material to tobacco raw material, and then performing extraction treatment to obtain an extract and a solid residue;

[0011] Step (3): concentrating the extract to obtain a primary coating solution;

[0012] Step (4): adding the TSP solution to the initial coating solution in a predetermined amount to obtain a final coating solution;

[0013] Step (5): performing pulping and papermaking on the solid residue to obtain a wet sheet base;

[0014] Step (6): drying the wet film base to obtain a dry film base;

[0015] Step (7): coating the dry sheet base with the final coating liquid to obtain wet reconstituted tobacco leaves;

[0016] Step (8): drying the wet reconstituted tobacco leaves to obtain dry reconstituted tobacco leaves;

[0017] Step (9): spraying the carrageenan solution on the surface of the dry reconstituted tobacco leaves and drying them again to obtain reconstituted tobacco leaves.

[0018] Optionally, the step (1) is specifically as follows:

[0019] Step (1-1): preheating water to 70°C-80°C, then uniformly adding TSP powder to the water by positive pressure spraying under stirring conditions, the positive pressure being controlled between 0.1 bar and 0.5 bar, the spraying gas flow rate being 150 Nl / min-240 Nl / min, and the dissolution time of the TSP powder being controlled to be less than or equal to 10 minutes, thereby obtaining a TSP solution;

[0020] Step (1-2): preheat water to 60°C-70°C, then uniformly add carrageenan powder to the water by positive pressure spraying under stirring conditions, the positive pressure is controlled between 0.1 bar and 0.5 bar, the spraying gas flow rate is 150 Nl / min-240 Nl / min, and the dissolution time of the carrageenan powder is controlled to be less than or equal to 10 minutes, thereby obtaining a carrageenan solution.

[0021] Optionally, the mass percentage of the TSP solution in step (1) is 1.8wt%-2.5wt%, and the stirring speed is 1000r / min-1200r / min;

[0022] The mass percentage of the carrageenan solution is 0.1wt%-0.3wt%, and the stirring speed is 1000r / min-1200r / min.

[0023] Optionally, the step (2) is specifically as follows:

[0024] Tobacco stems and / or tobacco dust are used as tobacco raw materials, and coniferous wood pulp fiber pulp boards are used as fiber raw materials. According to the mass ratio of tobacco raw materials to fiber raw materials being 100:(7-10), at a temperature of 60°C-75°C, the mass ratio of raw materials to water is 1:6-1:8, and after extraction for 40min-70min, solid-liquid separation is performed to obtain an extract and a solid residue.

[0025] Optionally, the softwood pulp fiber pulp board in step (2) is deflaked at a deflaking concentration of 5 wt% to 15 wt% after being soaked for 4 to 8 hours, and then uniformly mixed with tobacco stems and / or tobacco dust.

[0026] Optionally, the step (3) is specifically as follows:

[0027] The extract was vacuum concentrated to a density of 1.200 g / cm 3 -1.280g / cm 3 , and obtain the primary coating solution.

[0028] Optionally, the step (4) is specifically as follows:

[0029] The TSP solution was added to the initial coating solution in a stirring state in an amount such that the mass fraction of TSP in the film base was 0.5 wt %, to obtain a final coating solution.

[0030] Optionally, the step (5) is specifically as follows:

[0031] The solid residue is beaten to obtain a pulp with a beating degree of 35°SR-50°SR, and then the pulp is sheeted into a basis weight of 58g / m 2 -62g / m 2 film base.

[0032] Optionally, the temperature of the drying treatment in step (6) is 120°C-130°C, and the temperature of the drying treatment in steps (8) and (9) are both 100°C-120°C.

[0033] Optionally, the step (9) is specifically as follows:

[0034] A carrageenan solution containing 0.1 wt% to 0.3 wt% of the absolute dry weight of the reconstituted tobacco leaves is sprayed on one side 2 to 4 times at a spraying density of 10 L / min to 100 L / min, and the number of double-sided sprayings of the dry reconstituted tobacco leaves is the same or the difference in the number of sprayings is 1. Drying is performed after each spraying.

[0035] The method for preparing reconstituted tobacco leaves with enhanced water retention, provided by the present invention, utilizes TSP to enhance the coating effect, effectively maintaining a high aroma retention capacity in the reconstituted tobacco leaves. Furthermore, carrageenan is applied to the reconstituted tobacco leaves to further lock in moisture. Furthermore, the preparation method of the present invention is simple, efficient, and highly operable. The prepared reconstituted tobacco leaves exhibit enhanced water retention, effectively improving the water retention of the reconstituted tobacco leaves and thereby enhancing their quality.

[0036] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0038] Figure 1 This is a comparison chart of water loss over time for the examples and comparative examples of the present application. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0042] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] The method for preparing reconstituted tobacco with improved water holding capacity comprises the following steps:

[0044] Step (1): After preheating the water, TSP powder and carrageenan powder are added to the water under stirring conditions to obtain a TSP solution and a carrageenan solution.

[0045] Step (1) may be specifically as follows:

[0046] Step (1-1): Preheat water to 70°C-80°C, then uniformly add TSP powder to the water under stirring using positive pressure spraying. The positive pressure is controlled between 0.1 bar and 0.5 bar, the spraying gas flow rate is 150 Nl / min-240 Nl / min, and the dissolution time of the TSP powder is controlled to be less than or equal to 10 minutes to obtain a TSP solution. This operation helps to improve the uniformity of the TSP powder dispersion in the water, prevent the TSP powder from agglomerating in the water, and ensure the effective dissolution of the TSP powder.

[0047] Step (1-2): Preheat water to 60°C-70°C, then uniformly add carrageenan powder to the water under stirring using positive pressure spraying. The positive pressure is controlled between 0.1 bar and 0.5 bar, and the spraying gas flow rate is 150 Nl / min-240 Nl / min. The dissolution time of the carrageenan powder is controlled to be less than or equal to 10 minutes, thereby obtaining a carrageenan solution. This operation is conducive to improving the uniformity of the dispersion of the carrageenan powder in the water, preventing the carrageenan powder from agglomerating in the water, and ensuring the effective dissolution of the carrageenan powder.

[0048] In step (1), the mass percentage of the TSP solution is 1.8 wt%-2.5 wt%, and the stirring speed is 1000 rpm-1200 rpm. The mass percentage of the carrageenan solution is 0.1 wt%-0.3 wt%, and the stirring speed is 1000 rpm-1200 rpm.

[0049] Step (2): After adding fiber raw material to tobacco raw material, extraction treatment is performed to obtain an extract and solid residue.

[0050] Step (2) may be specifically as follows:

[0051] Tobacco stems and / or tobacco dust are used as tobacco raw materials, and coniferous wood pulp fiber pulp boards are used as fiber raw materials. According to the mass ratio of tobacco raw materials to fiber raw materials being 100:(7-10), at a temperature of 60°C-75°C, the mass ratio of raw materials to water is 1:6-1:8, and after extraction for 40min-70min, solid-liquid separation is performed to obtain an extract and a solid residue.

[0052] The softwood pulp fiber pulp board in step (2) is debonded at a debonding concentration of 5wt% to 15wt% after being soaked for 4h to 8h, and then uniformly mixed with tobacco stems and / or tobacco dust.

[0053] Step (3): Concentrating the extract to obtain a primary coating solution.

[0054] Step (3) may be specifically as follows:

[0055] The extract was vacuum concentrated to a density of 1.200 g / cm 3 -1.280g / cm 3 , and obtain the primary coating solution.

[0056] Step (4): adding the TSP solution to the initial coating solution in a predetermined amount to obtain a final coating solution.

[0057] Step (4) may be specifically as follows:

[0058] The TSP solution was added to the initial coating solution in a stirring state in an amount such that the mass fraction of TSP in the film base was 0.5 wt %, to obtain a final coating solution.

[0059] Step (5): The solid residue is subjected to pulping and papermaking treatment to obtain a wet sheet base.

[0060] Step (5) may be specifically as follows:

[0061] The solid residue is beaten to obtain a pulp with a beating degree of 35°SR-50°SR, and then the pulp is sheeted into a basis weight of 58g / m 2 -62g / m 2 film base.

[0062] Step (6): drying the wet film base to obtain a dry film base.

[0063] The temperature of the drying treatment in step (6) can be 120°C-130°C.

[0064] Step (7): coating the dry sheet base with the final coating liquid to obtain wet reconstituted tobacco leaves.

[0065] Step (8): drying the wet reconstituted tobacco leaves to obtain dry reconstituted tobacco leaves.

[0066] Step (9): spraying the carrageenan solution on the surface of the dry reconstituted tobacco leaves and drying them again to obtain reconstituted tobacco leaves.

[0067] The drying temperature in step (8) and step (9) can be 100°C-120°C.

[0068] Step (9) may be specifically as follows:

[0069] A carrageenan solution containing 0.1 wt% to 0.3 wt% of the absolute dry weight of the reconstituted tobacco leaves is sprayed on one side 2 to 4 times at a spraying density of 10 L / min to 100 L / min, and the number of double-sided sprayings of the dry reconstituted tobacco leaves is the same or the difference in the number of sprayings is 1. Drying is performed after each spraying.

[0070] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods. The materials and reagents used are all commercially available unless otherwise specified. The equipment used in the experiments are all well known to those skilled in the art unless otherwise specified.

[0071] Example 1

[0072] Step (1): preheating water to 70° C., uniformly adding 2 g of TSP powder to 100 ml of water at a stirring speed of 1200 r / min at a positive pressure of 0.38 bar and a blowing gas flow rate of 200 Nl / min, while controlling the dissolution time of the TSP powder to be 8 minutes, to obtain a TSP solution; preheating water to 65° C., uniformly adding 2 g of carrageenan powder to 1000 ml of water at a stirring speed of 1000 r / min at a positive pressure of 0.38 bar and a blowing gas flow rate of 200 Nl / min, while controlling the dissolution time of the carrageenan powder to be 10 minutes, to obtain a carrageenan solution;

[0073] Step (2): adding 8 wt% of a wood pulp fiberboard soaked for 4 hours to a tobacco raw material, performing an extraction treatment at a temperature of 65° C. and a mass ratio of raw material to water of 1:7 for 60 minutes to obtain an extract and a solid residue;

[0074] Step (3): The extract was vacuum concentrated to a density of 1.250 g / cm 3 , obtaining the primary coating solution;

[0075] Step (4): adding the TSP solution to the initial coating solution, based on a mass fraction of TSP in the film base of 0.5 wt%, to obtain a final coating solution;

[0076] Step (5): The solid residue is beaten to obtain a pulp with a beating degree of 40°SR, and the pulp is then sheeted into a paper with an absolute dry weight of 60 g / m 2 Wet film base;

[0077] Step (6): drying the wet film base at 125° C. to obtain a dry film base;

[0078] Step (7): coating the dry sheet base with the final coating liquid to obtain wet reconstituted tobacco leaves;

[0079] Step (8): drying the wet reconstituted tobacco leaves at 108° C. to obtain dry reconstituted tobacco leaves;

[0080] Step (9): spraying a carrageenan solution containing 0.1 wt% of carrageenan to the absolute dry weight of the reconstituted tobacco leaves with an atomizing spray head at a spray density of 20 L / min, drying at 108° C. after each spraying, and performing a total of three sprayings (twice on one side and once on the other side).

[0081] Example 2

[0082] The only difference from Example 1 is:

[0083] In step (9), the carrageenan solution containing 0.2 wt% of carrageenan based on the absolute dry weight of the reconstituted tobacco leaves is sprayed on the reconstituted tobacco leaves.

[0084] Example 3

[0085] The only difference from Example 1 is:

[0086] In step (9), the carrageenan solution containing 0.3 wt% of carrageenan based on the absolute dry weight of the reconstituted tobacco leaves is sprayed on the reconstituted tobacco leaves.

[0087] Comparative Example 1

[0088] The difference from Example 1 is:

[0089] Step (9): spraying the surface of the dry reconstituted tobacco leaves with pure water, spraying the pure water with an atomizing spray head at a spray density of 20L / min, drying after each spraying, and spraying a total of 3 times (twice on one side and once on the other side).

[0090] The finished reconstituted tobacco leaves obtained in Examples 1-3 and Comparative Example 1 were placed in a constant temperature and humidity chamber at 22° C. and 60% humidity for 48 hours, and then placed in a rapid moisture meter for drying.

[0091] like Figure 1 As shown in the figure, the moisture percentages of the samples sprayed with carrageenan are all lower than that of the comparative examples. When the spraying amount of carrageenan is 0.3 wt%, the moisture loss rate is the lowest.

[0092] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for preparing reconstituted tobacco with improved water holding capacity, characterized in that: The steps include: Step (1-1): preheating water to 70° C.-80° C., then uniformly adding TSP powder to the water by positive pressure spraying under stirring conditions, wherein the positive pressure is controlled between 0.1 bar and 0.5 bar, the spraying gas flow rate is 150 Nl / min-240 Nl / min, and the dissolution time of the TSP powder is controlled to be less than or equal to 10 minutes, thereby obtaining a TSP solution having a mass percentage of 1.8 wt%-2.5 wt% and a stirring speed of 1000 r / min-1200 r / min; Step (1-2): preheating water to 60° C.-70° C., then uniformly adding carrageenan powder to the water by positive pressure spraying under stirring conditions, wherein the positive pressure is controlled between 0.1 bar and 0.5 bar, the spraying gas flow rate is 150 Nl / min-240 Nl / min, and the dissolution time of the carrageenan powder is controlled to be less than or equal to 10 minutes, thereby obtaining a carrageenan solution, wherein the mass percentage of the carrageenan solution is 0.1 wt%-0.3 wt%, and the stirring speed is 1000 r / min-1200 r / min; Step (2): adding fiber raw material to tobacco raw material, and then performing extraction treatment to obtain an extract and a solid residue; Step (3): concentrating the extract to obtain a primary coating solution; Step (4): adding the TSP solution to the initial coating solution in a stirred state at a mass fraction of TSP to the substrate of 0.5 wt % to obtain a final coating solution; Step (5): performing pulping and papermaking on the solid residue to obtain a wet sheet base; Step (6): drying the wet film base to obtain a dry film base; Step (7): coating the dry sheet base with the final coating liquid to obtain wet reconstituted tobacco leaves; Step (8): drying the wet reconstituted tobacco leaves to obtain dry reconstituted tobacco leaves; Step (9): spraying a carrageenan solution containing 0.1 wt% to 0.3 wt% of the absolute dry weight of the reconstituted tobacco leaves on one side 2 to 4 times at a spraying density of 10 L / min to 100 L / min, and the number of sprayings on both sides of the dry reconstituted tobacco leaves is the same or the difference in the number of sprayings is 1, and drying is performed after each spraying.

2. The method for preparing reconstituted tobacco with improved water holding capacity according to claim 1, characterized in that: The step (2) is specifically as follows: Tobacco stems and / or tobacco dust are used as tobacco raw materials, and coniferous wood pulp fiber pulp boards are used as fiber raw materials. According to the mass ratio of tobacco raw materials to fiber raw materials being 100:(7-10), at a temperature of 60°C-75°C, the mass ratio of raw materials to water is 1:6-1:8, and after extraction for 40min-70min, solid-liquid separation is performed to obtain an extract and a solid residue.

3. The method for preparing reconstituted tobacco with improved water holding capacity according to claim 2, wherein: The softwood pulp fiber pulp board in step (2) is soaked for 4-8 hours, then deflaked at a deflaking concentration of 5wt%-15wt%, and then evenly mixed with tobacco stems and / or tobacco dust.

4. The method for preparing reconstituted tobacco with improved water holding capacity according to claim 1, wherein: The step (3) is specifically as follows: The extract was vacuum concentrated to a density of 1.200 g / cm 3 -1.280g / cm 3 , and obtain the primary coating solution.

5. The method for preparing reconstituted tobacco with improved water holding capacity according to claim 1, wherein: The step (5) is specifically as follows: The solid residue is beaten to obtain a pulp with a beating degree of 35°SR-50°SR, and then the pulp is sheeted into a basis weight of 58g / m 2 -62g / m 2 film base.

6. The method for preparing reconstituted tobacco with improved water holding capacity according to claim 1, wherein: The temperature of the drying treatment in step (6) is 120°C-130°C, and the temperature of the drying treatment in steps (8) and (9) is 100°C-120°C.

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