High-aroma and high-surface-strength reconstituted tobacco containing ultra-low quantitative film base and ultra-thin skin and preparation method of high-aroma and high-surface-strength reconstituted tobacco

Abstract

The invention provides a high-aroma and high-surface-strength reconstituted tobacco containing an ultra-low quantitative film base and an ultra-thin skin and a preparation method of the high-aroma and high-surface-strength reconstituted tobacco. The preparation method comprises the following steps: preparing an ultra-low basis weight film base by using a crescent-shaped papermaking machine; preparing a body coating liquid; transferring the body coating liquid to the upper surface and the lower surface of the ultra-low basis weight film base to respectively form a first body and a second body, and drying to obtain a reconstituted tobacco semi-finished product; preparing a skin coating liquid; transferring the epidermis coating liquid to the upper surface and the lower surface of the reconstituted tobacco semi-finished product to form a first epidermis and a second epidermis respectively so as to prepare the reconstituted tobacco; wherein the quantitation of the ultra-low quantitation film base is 8-20 g / m < 2 >, the quantitation of the first body and the quantitation of the second body are respectively and independently 15-40 g / m < 2 >, the quantitation of the first skin and the quantitation of the second skin are respectively and independently 1-4 g / m < 2 >, and the thicknesses of the first skin and the second skin are respectively and independently 10-200 microns.

Description

Technical Field

[0001] This application relates to the field of reconstituted tobacco technology, and in particular to a reconstituted tobacco leaf with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis, and a method for preparing the same. Background Technology

[0002] Reconstituted tobacco sheet, also known as tobacco flakes, is a reconstituted homogeneous tobacco sheet formed by reprocessing waste materials (tobacco dust, tobacco stems, etc.) generated during tobacco processing. Currently, the main production processes for reconstituted tobacco sheet include roll pressing, slurry processing, papermaking, and dry processing.

[0003] As recorded in CN112841703B, reconstituted tobacco produced by the roll pressing method does not contain fiber network substrate. The product has poor tensile strength, flexibility, and filling properties, is prone to breakage, and has a high breakage rate during processing, which seriously affects the performance of the roll-pressed reconstituted tobacco.

[0004] Thick slurry reconstituted tobacco leaves also lack fiber network substrate and suffer from the same defect of low tensile strength of thin sheets. Traditional technology CN118787122A improves the tensile strength of reconstituted tobacco leaves by adjusting the timing of adhesive addition, mixing it with tobacco powder first and then with fiber material. This allows the adhesive to swell between the tobacco powder and fibers, resulting in more thorough cross-linking of the tobacco powder and fibers under the action of the adhesive, thereby improving the bonding force between the tobacco powder and fibers.

[0005] Although reconstituted tobacco produced by the papermaking process contains a fibrous network substrate, the basis weight of the substrate is generally relatively high (50 g / m²). 2 ~60g / m 2 High basis weight, accounting for 50% to 60% of the total weight of reconstituted tobacco leaves, while providing higher tensile strength, also leads to a significant decline in sensory quality. This includes issues such as a heavier woody or off-flavor, poor aroma quantity and quality, masking of the natural tobacco aroma, burning sensation in the throat, and severe irritation (e.g., CN101785577B and CN112438420B). Furthermore, high basis weight significantly reduces the permeability, softness, and bulk of the reconstituted tobacco leaves, lowering cigarette combustion efficiency, affecting combustion uniformity, and increasing breakage and dusting rates during shredding, thus impacting cigarette production.

[0006] Dry-processed reconstituted tobacco leaves contain a fiber network substrate, with a substrate weight typically of 20 g / m³. 2 ~40g / m 2Because hydrogen bonds are not formed between fibers, adding adhesives alone has limited effect on improving the tensile strength of the sheet. Furthermore, dry-process tobacco sheets have low surface strength, resulting in a high powder loss rate (generally greater than 3%) during shredding and poor processability. Dry-process tobacco sheets are a new type of environmentally friendly tobacco sheet manufacturing process developed based on airflow forming technology. However, the product has a loose and porous structure, resulting in poor tensile strength. This leads to sheet breakage during actual production, interrupting production and significantly reducing the processing efficiency of dry-process tobacco sheets. To address the low tensile strength of dry-process sheets, calendering is generally used to enhance the tensile strength. However, the strengthening effect is unsatisfactory, and the low efficiency caused by the low tensile strength of the sheets during production has not been effectively resolved (e.g., CN114568732B).

[0007] Therefore, it is necessary to further improve the traditional reconstituted tobacco. Summary of the Invention

[0008] To address the common technical bottlenecks in traditional reconstituted tobacco, such as the poor machine adaptability caused by low tensile strength, high brittleness, and low elongation due to the absence of fiber network substrate in roll pressing and slurry processes, the sensory quality problems of heavy off-odors and poor aroma caused by the high basis weight fiber network substrate in papermaking reconstituted tobacco, and the practical production problems of low tensile strength and high dusting rate in dry-process reconstituted tobacco, this application effectively improves the technical bottleneck of the difficulty in balancing the two quality indicators of tensile strength and aroma in traditional reconstituted tobacco through ultra-low basis weight substrate technology; and improves the quality defects of poor surface strength and high dusting rate commonly found in traditional reconstituted tobacco through ultra-thin skin technology.

[0009] The high-aroma, high-surface-strength reconstituted tobacco prepared in this application is suitable for roll pressing, slurry pressing, papermaking, and dry processing. It achieves a good balance between physical properties and sensory quality, and has the characteristics of high aroma, high surface strength, high fragrance quality, and high processability. It is suitable not only for traditional cigarettes but also for heated cigarettes.

[0010] According to a first aspect of the embodiments of this application, a method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis is provided, comprising the following steps:

[0011] S1. Preparation of ultra-low basis weight sheet base using a crescent-shaped paper machine;

[0012] S2. Prepare the bulk coating solution;

[0013] S3. The bulk coating liquid is transferred to the upper and lower surfaces of the ultra-low quantitative substrate to form the first bulk and the second bulk, respectively, and dried to obtain the reconstituted tobacco semi-finished product.

[0014] S4. Prepare the epidermal coating solution;

[0015] S5. The epidermal coating liquid is transferred to the upper and lower surfaces of the reconstituted tobacco semi-finished product to form the first epidermal layer and the second epidermal layer, respectively, to obtain reconstituted tobacco.

[0016] The quantitative amount of the ultra-low quantitative tablet base is 8 g / m³. 2 ~20g / m 2 The quantitative amount of the first body is 15 g / m³. 2 ~40g / m 2 The quantitative amount of the second body is 15 g / m³. 2 ~40g / m 2 The quantitative amount of the first epidermis was 1 g / m³. 2 ~4g / m 2 The quantitative amount of the second epidermis was 1 g / m³. 2 ~4g / m 2 The thickness of the first epidermis is 10μm~200μm, and the thickness of the second epidermis is 10μm~200μm.

[0017] In some embodiments, the preparation method satisfies at least one of the following characteristics:

[0018] (1) The quantitative amount of the reconstituted tobacco leaf is 40 g / m³. 2 ~108g / m 2 ;

[0019] (2) The tensile index of the reconstituted tobacco leaf is 10 N·m·g. -1 ~30 N·m·g -1 ;

[0020] (3) The static contact angle of the first epidermis is 80°~120°;

[0021] (4) The static contact angle of the second epidermis is 80°~120°;

[0022] (5) The sensory quality score of the reconstituted tobacco leaves is 80-90 points;

[0023] (6) The powder loss rate of the reconstituted tobacco leaves during shredding is ≤2%;

[0024] (7) The air permeability of the reconstituted tobacco leaf is 1000CU~3000CU;

[0025] (8) The thickness of the first epidermis is 50 μm to 150 μm;

[0026] (9) The thickness of the second epidermis is 50μm~150μm.

[0027] In some embodiments, the preparation method satisfies at least one of the following characteristics:

[0028] (1) The quantitative amount of the reconstituted tobacco leaf is 60 g / m³. 2 ~90g / m 2 ;

[0029] (2) The tensile index of the reconstituted tobacco leaf is 15 N·m·g. -1 ~25 N·m·g -1 ;

[0030] (3) The static contact angle of the first epidermis is 90°~110°;

[0031] (4) The static contact angle of the second epidermis is 90°~110°;

[0032] (5) The sensory quality score of the reconstituted tobacco leaves is 82-85 points;

[0033] (6) The powder loss rate of the reconstituted tobacco leaves is ≤1.5%.

[0034] In some embodiments, the crescent paper machine includes a crescent former, a headbox, and a Yankee dryer.

[0035] In some embodiments, the quantification of the ultra-low quantification substrate is 8 g / m³. 2 ~15g / m 2 .

[0036] In some embodiments, the bulk coating liquid comprises, by weight, 5-35 parts tobacco particles, 4-12 parts smoking agent, 2-9 parts adhesive, 2-6 parts tobacco extract, 1-3 parts dispersant, 1-3 parts stabilizer, 1-3 parts tobacco flavoring and 70-95 parts water.

[0037] In some embodiments, the preparation method satisfies at least one of the following characteristics:

[0038] (1) The solid content of the bulk coating liquid is 12%~22%;

[0039] (2) The viscosity of the bulk coating liquid is 800 Pa·s to 2000 Pa·s;

[0040] (3) The coating rate of the bulk coating liquid is 78%~80%;

[0041] (4) The coating amount of the bulk coating liquid is 30 g / m³. 2 ~80g / m 2 .

[0042] In some embodiments, the components of the epidermal coating liquid, by weight, include 1-3 parts paraffin emulsion, 2-4 parts carboxymethyl cellulose, 1-2 parts xanthan gum, 2-4 parts tobacco extract, 1-3 parts polyvinyl alcohol, 1-2 parts tobacco flavoring, and 80-90 parts water.

[0043] In some embodiments, the preparation method satisfies at least one of the following characteristics:

[0044] (1) The solid content of the epidermal coating liquid is 6%~15%;

[0045] (2) The viscosity of the epidermal coating liquid is 200 Pa·s to 800 Pa·s;

[0046] (3) The coating rate of the epidermal coating solution is 1%~10%;

[0047] (4) The coating amount of the epidermal coating liquid is 2 g / m². 2 ~8g / m 2 .

[0048] According to a second aspect of the embodiments of this application, a reconstituted tobacco leaf with high aroma and high surface strength containing an ultra-low quantitative substrate and an ultra-thin epidermis is provided. It is prepared by the above-described preparation method. The reconstituted tobacco leaf includes a first epidermis, a first body, an ultra-low quantitative substrate, a second body, and a second epidermis arranged in sequence.

[0049] Compared with traditional technologies, this application has the following advantages:

[0050] (1) The method for preparing high-aroma and high-surface-strength reconstituted tobacco leaves containing ultra-low quantitative sheet base and ultra-thin skin provided in this application provides a high tensile strength fiber network sheet base for reconstituted tobacco leaves produced by rolling and slurry methods without sheet base through ultra-low quantitative sheet base technology. This solves the technical problems of low tensile strength, high brittleness and poor toughness that are common in traditional rolling and slurry reconstituted tobacco leaves. It also solves the problem of easy breakage during the rolling process due to low tensile strength, improves the continuous stability of reconstituted tobacco leaf processing and production, and significantly enhances its adaptability to machine operation.

[0051] (2) By using ultra-low basis weight sheet technology, the basis weight of reconstituted tobacco leaves produced by papermaking is reduced, achieving product performance with both high tensile strength and high aroma quality. This effectively solves the product defects caused by high basis weight sheet, such as heavy woody odor and poor aroma quality. It provides a new low basis weight sheet technology for traditional dry-process reconstituted tobacco leaves, effectively solving the practical production problems of poor tensile strength and serious dust loss in traditional dry-process reconstituted tobacco leaves.

[0052] (3) By using the ultra-thin skin reconstructing technology, the surface strength of the reconstructed tobacco leaves is enhanced, the powder and residue rate is reduced, and the filament formation rate is increased. This solves the problems of low surface strength, easy powder and residue or breakage, low filament formation rate, and serious raw material loss and waste, and overcomes the defects and shortcomings of poor processing resistance in subsequent processing.

[0053] (4) The reconstituted tobacco leaf with high aroma and high surface strength containing ultra-low quantitative sheet base and ultra-thin skin prepared in this application is suitable for traditional rolling, thick pulp, papermaking and dry reconstituted tobacco leaf. When applied to traditional cigarettes and heated cigarettes, the physical properties and sensory quality of the cigarettes are greatly improved, ensuring product quality stability and enhancing the consumer experience. Attached Figure Description

[0054] To more clearly illustrate the technical solutions of the specific embodiments of this application, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0055] Figure 1 This is a schematic diagram of the reconstituted tobacco preparation process in one embodiment of this application.

[0056] Figure 2 This is a schematic diagram of the reconstituted tobacco leaf structure in one embodiment of this application.

[0057] Explanation of reference numerals in the attached figures: 1. Ultra-low quantitative substrate; 2. First body; 3. Second body; 4. First epidermis; 5. Second epidermis. Detailed Implementation

[0058] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, a detailed description of specific embodiments of this application is provided. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise specifically stated, all raw materials, reagents, instruments, and equipment used in this application are commercially available or can be prepared by existing methods.

[0060] like Figure 1As shown, some embodiments of this application provide a method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis, comprising the following steps:

[0061] S1. Preparation of ultra-low basis weight sheet base using a crescent-shaped paper machine;

[0062] S2. Prepare the bulk coating solution;

[0063] S3. The bulk coating liquid is transferred to the upper and lower surfaces of the ultra-low quantitative substrate to form the first bulk and the second bulk respectively, and then dried to obtain the reconstituted tobacco semi-finished product.

[0064] S4. Prepare the epidermal coating solution;

[0065] S5. Transfer the epidermal coating liquid to the upper and lower surfaces of the reconstituted tobacco semi-finished product to form the first epidermal layer and the second epidermal layer respectively, and obtain reconstituted tobacco.

[0066] Among them, the quantitative concentration of ultra-low quantitative tablets was 8 g / m³. 2 ~20g / m 2 The quantitative value of the first volume was 15 g / m³. 2 ~40g / m 2 The quantitative amount of the second body is 15 g / m³. 2 ~40g / m 2 The quantitative amount of the first epidermis was 1 g / m². 2 ~4g / m 2 The quantitative concentration of the second epidermis was 1 g / m². 2 ~4g / m 2 The thickness of the first epidermis is 10μm~200μm, and the thickness of the second epidermis is 10μm~200μm.

[0067] It is understood that in this application, "quantitative" refers to the mass per unit area.

[0068] The reconstituted tobacco leaf of this application comprises a low-weight sheet base and a thinner first and second skin. The low-weight sheet base provides a foundation for high tensile strength, improves the problems of brittleness and poor toughness of reconstituted tobacco leaves, reduces the breakage phenomenon during the processing of reconstituted tobacco leaves, and reduces impurities and aroma. At the same time, the outer sides of the first and second reconstituted tobacco leaf bodies are respectively provided with thinner skins, which can enhance the surface strength of the reconstituted tobacco leaves, reduce the dust and residue rate, and thus improve the tobacco leaf filament yield.

[0069] By reducing the amount of tobacco leaf substrate, reconstituted tobacco not only achieves good tensile strength but also improves its defects such as heavy woody odor and poor aroma quality. Adding an ultra-thin outer layer to the surface of the tobacco leaf enhances its surface strength and reduces dust and residue shedding.

[0070] In some embodiments, in S30, the method of transferring the bulk coating liquid to the substrate surface includes one or a combination of several of the following: roller coating, sizing press, metering rod film transfer coating, dip coating, spray coating, curtain coating, multilayer slope flow coating, slot coating, and extrusion coating.

[0071] In some embodiments, in S50, the method of transferring the skin coating liquid to the body surface includes one or a combination of several of the following: roller coating, sizing press, metering rod film transfer coating, dip coating, spray coating, curtain coating, multilayer slope flow coating, slot coating, and extrusion coating.

[0072] In some embodiments, the amount of reconstituted tobacco is 40 g / m³. 2 ~108g / m 2 Furthermore, the quantitative amount of reconstituted tobacco is 60 g / m³. 2 ~90g / m 2 .

[0073] In some of these embodiments, the tensile index of the reconstituted tobacco leaf is 10 N·m·g. -1 ~30 N·m·g -1 Furthermore, the tensile index of reconstituted tobacco leaves is 15 N·m·g. -1 ~25 N·m·g -1 .

[0074] In some embodiments, the static contact angle of the first epidermis is 80°~120°; further, the static contact angle of the first epidermis is 90°~110°.

[0075] In some embodiments, the static contact angle of the second skin is 80° to 120°; further, the static contact angle of the second skin is 90° to 110°.

[0076] In some embodiments, the sensory quality score of the reconstituted tobacco leaf is 80-90 points; further, the sensory quality score of the reconstituted tobacco leaf is 82-85 points.

[0077] In some embodiments, the shredded tobacco powder loss rate is ≤2%; further, the shredded tobacco powder loss rate is ≤1.5%.

[0078] In some embodiments, the air permeability of the reconstituted tobacco is 1000 CU to 3000 CU.

[0079] In some embodiments, the thickness of the first epidermis is 50 μm to 150 μm.

[0080] In some embodiments, the thickness of the second skin is 50 μm to 150 μm.

[0081] In some embodiments, the crescent paper machine includes a crescent former, a headbox, and a Yankee dryer.

[0082] Understandably, the crescent-shaped paper machine is a high-efficiency papermaking equipment mainly used for producing household paper. It has advantages such as high machine speed, large capacity, rapid and uniform dewatering, high fiber retention, and good paper quality. It can be used to produce paper with a basis weight of 8g / m³. 2 ~20g / m 2 The product. Furthermore, the hydrogen bonds formed between the fibers of the sheet produced using a crescent-shaped paper machine provide the paper sheet with high tensile strength and surface strength. Utilizing a crescent-shaped paper machine to produce low-basis-weight sheet material for reconstituted tobacco production can effectively solve the technical bottleneck of balancing tensile strength and aroma, which is prevalent in existing reconstituted tobacco products, and overcome the contradiction between product quality and processing performance.

[0083] In some embodiments, the quantification of the ultra-low quantification tablet base is 8 g / m³. 2 ~15g / m 2 .

[0084] In some embodiments, the bulk coating liquid comprises, by weight, 5-35 parts tobacco particles, 4-12 parts smoking agent, 2-9 parts adhesive, 2-6 parts tobacco extract, 1-3 parts dispersant, 1-3 parts stabilizer, 1-3 parts tobacco flavoring and 70-95 parts water.

[0085] In some embodiments, the solid content of the bulk coating liquid is 12% to 22%.

[0086] In some embodiments, the viscosity of the bulk coating liquid is 800 Pa·s to 2000 Pa·s.

[0087] In some embodiments, the coating rate of the bulk coating liquid is 78% to 80%.

[0088] In some embodiments, the coating amount of the bulk coating liquid is 30 g / m³. 2 ~80g / m 2 .

[0089] In some embodiments, the components of the epidermal coating liquid, by weight, include 1-3 parts paraffin emulsion, 2-4 parts carboxymethyl cellulose, 1-2 parts xanthan gum, 2-4 parts tobacco extract, 1-3 parts polyvinyl alcohol, 1-2 parts tobacco flavoring, and 80-90 parts water.

[0090] In some of these embodiments, the components of the epidermal coating liquid, by weight, include 2 parts paraffin emulsion, 3 parts carboxymethyl cellulose, 1 part xanthan gum, 3 parts tobacco extract, 2 parts polyvinyl alcohol, 1 part tobacco flavoring, and 85 parts water.

[0091] In some embodiments, the solid content of the epidermal coating liquid is 6% to 15%.

[0092] In some embodiments, the viscosity of the epidermal coating liquid is 200 Pa·s to 800 Pa·s.

[0093] In some of these embodiments, the coating rate of the epidermal coating liquid is 1% to 10%.

[0094] In some embodiments, the coating amount of the epidermal coating liquid is 2 g / m². 2 ~8g / m 2 .

[0095] The reconstituted tobacco leaves described in this application are applicable to existing rolling, slurry, papermaking, and dry processes; when used in the production of cigarettes, they can significantly improve the physical properties and sensory quality of cigarettes, and give the product good quality stability.

[0096] like Figure 2 As shown, some embodiments of this application also provide a reconstituted tobacco leaf with high aroma and high surface strength containing an ultra-low quantitative substrate and an ultra-thin epidermis, which is prepared by the above-described preparation method. The reconstituted tobacco leaf includes a first epidermis 4, a first body 2, an ultra-low quantitative substrate 1, a second body 3, and a second epidermis 5 arranged in sequence.

[0097] The reconstituted tobacco leaf of this application includes an ultra-low basis weight base 1, a thinner first skin 4, and a second skin 5. The low basis weight base 1 provides a foundation for high tensile strength, improves the problems of high brittleness and poor toughness of reconstituted tobacco leaves, and reduces the breakage phenomenon of reconstituted tobacco leaves during processing. At the same time, a thinner skin is provided on the outer side of the first reconstituted tobacco leaf body 2 and the second reconstituted tobacco leaf body 3, which can enhance the surface strength of the reconstituted tobacco leaf, reduce the dust and residue rate, and thus improve the tobacco leaf filament yield.

[0098] The present application will be further described below with reference to specific embodiments and comparative examples, but these should not be construed as limiting the scope of protection of the present application. Unless otherwise specified, the raw materials involved in the following specific embodiments are all commercially available, the instruments used are all commercially available, and the processes involved are conventionally selected by those skilled in the art unless otherwise specified.

[0099] Example 1

[0100] (1) Bleached softwood sulfate pulp and bleached hardwood sulfate pulp with a mass ratio of 3:7 were used to prepare sheet substrate by roller pressing; the freeness of the finished pulp was 35°SR, the paperboard concentration was 0.15%, and the basis weight of the low basis weight sheet substrate was 8 g / m 2 .

[0101] (2) The formulation of the bulk coating solution is as follows: by weight, it includes 15 parts tobacco particles, 8 parts smoking agent, 2 parts adhesive, 2 parts tobacco extract, 1 part dispersant, 1 part stabilizer, 1 part tobacco flavoring, and 75 parts water; the solid content of the bulk coating solution is 15%, and the viscosity is 1500 mPa·s; the bulk coating solution is transferred to two surfaces of the substrate by spray coating technology, and after drying, the first bulk and the second bulk are formed respectively, thus preparing the reconstituted tobacco semi-finished product. Among them, the quantitative amounts of the first bulk, the second bulk, and the reconstituted tobacco semi-finished product are 30 g / m³, respectively. 2 30g / m 2 and 68g / m 2 .

[0102] (3) The formulation of the coating solution is as follows: by weight, it includes 2 parts paraffin emulsion, 3 parts CMC, 1 part xanthan gum, 3 parts Yunnan tobacco extract, 2 parts PVA, 1 part tobacco flavoring, and 85 parts water. The solid content of the coating solution is 3%, and the viscosity is 550 mPa·s. The coating solution is transferred to the surface of the first and second bodies away from the substrate using a surface spraying process. After drying, the first and second skins are formed respectively, and the reconstituted tobacco product is obtained. The quantitative amount of the first and second skins is 2.5 g / m³. 2 The finished product weight of reconstituted tobacco is 73g / m³. 2 The thicknesses of the first and second epidermis are 20 μm and 25 μm, respectively.

[0103] Example 2

[0104] (1) Bleached softwood sulfate pulp and bleached hardwood sulfate pulp with a mass ratio of 4:6 were used to prepare sheet substrate by the thickening method; the freeness of the finished pulp was 33°SR, the papermaking concentration was 0.18%, and the basis weight of the low basis weight sheet substrate was 12 g / m 2 .

[0105] (2) The formulation of the bulk coating solution is as follows: by weight, it includes 20 parts tobacco particles, 6 parts smoking agent, 4 parts adhesive, 3 parts tobacco extract, 2 parts dispersant, 2 parts stabilizer, 2 parts tobacco flavoring, and 80 parts water; the solid content of the bulk coating solution is 15%, and the viscosity is 1000 mPa·s; the bulk coating solution is transferred to the two surfaces of the substrate using roller coating technology, and after drying, the first bulk and the second bulk are formed respectively, thus preparing the reconstituted tobacco semi-finished product. The quantitative amounts of the first bulk, the second bulk, and the reconstituted tobacco semi-finished product are 32 g / m³, respectively. 2 32g / m 2 and 76g / m 2 .

[0106] (3) The formulation of the coating solution is as follows: by weight, it includes 2 parts paraffin emulsion, 3 parts CMC, 1 part xanthan gum, 3 parts Yunnan tobacco extract, 2 parts PVA, 1 part tobacco flavoring, and 85 parts water. The solid content of the coating solution is 3%, and the viscosity is 720 mPa·s. The coating solution is transferred to the surface of the first and second bodies away from the substrate using a surface spraying process. After drying, the first and second skins are formed respectively, and the reconstituted tobacco product is obtained. The quantitative amount of the first and second skins is 2 g / m². 2 The finished product weight of reconstituted tobacco is 80g / m³. 2 The thicknesses of the first and second epidermis are 40 μm and 40 μm, respectively.

[0107] Example 3

[0108] (1) Bleached softwood sulfate pulp and bleached hardwood sulfate pulp with a mass ratio of 5:5 were used to prepare sheet substrate by papermaking; the freeness of the finished pulp was 30°SR, the papermaking concentration was 0.24%, and the basis weight of the low basis substrate was 15 g / m 2 .

[0109] (2) The formulation of the bulk coating solution is as follows: by weight, it includes 30 parts tobacco particles, 9 parts smoking agent, 9 parts adhesive, 6 parts tobacco extract, 3 parts dispersant, 3 parts stabilizer, 3 parts tobacco flavoring, and 90 parts water; the solid content of the bulk coating solution is 18%, and the viscosity is 800 mPa·s; the bulk coating solution is transferred to the two surfaces of the substrate by spray coating combined with dip coating technology, and after drying, the first bulk and the second bulk are formed respectively, thus preparing the reconstituted tobacco semi-finished product. Among them, the quantitative amounts of the first bulk, the second bulk, and the reconstituted tobacco semi-finished product are 35 g / m³, respectively. 2 35g / m 2 and 85g / m 2 .

[0110] (3) The formulation of the coating solution is as follows: by weight, it includes 2 parts paraffin emulsion, 3 parts CMC, 1 part xanthan gum, 3 parts Yunnan tobacco extract, 2 parts PVA, 1 part tobacco flavoring, and 85 parts water. The solid content of the coating solution is 3%, and the viscosity is 810 mPa·s. The coating solution is transferred to the surface of the first and second bodies away from the substrate using a surface spraying process. After drying, the first and second skins are formed respectively, and the reconstituted tobacco product is obtained. The quantitative amount of the first and second skins is 2.5 g / m³. 2 The finished product weight of reconstituted tobacco is 90g / m³. 2 The thicknesses of the first and second epidermis are 50 μm and 50 μm, respectively.

[0111] Example 4

[0112] (1) Bleached softwood sulfate pulp and bleached hardwood sulfate pulp with a mass ratio of 3:7 were used to prepare sheet substrate by papermaking; the freeness of the finished pulp was 36°SR, the papermaking concentration was 0.25%, and the basis weight of the low basis substrate was 20 g / m 2 .

[0113] (2) The formulation of the bulk coating solution is as follows: by weight, it includes 35 parts tobacco particles, 12 parts smoking agent, 6 parts adhesive, 6 parts tobacco extract, 3 parts dispersant, 1 part stabilizer, 1 part tobacco flavoring, and 85 parts water; the solid content of the bulk coating solution is 17%, and the viscosity is 2500 mPa·s; the bulk coating solution is transferred to two surfaces of the substrate by spray coating technology, and after drying, the first bulk and the second bulk are formed respectively, thus preparing the reconstituted tobacco semi-finished product. Among them, the quantitative amounts of the first bulk, the second bulk, and the reconstituted tobacco semi-finished product are 30 g / m³, respectively. 2 30g / m 2 and 80g / m 2 .

[0114] (3) The formulation of the coating solution is as follows: by weight, it includes 2 parts paraffin emulsion, 3 parts CMC, 1 part xanthan gum, 3 parts Yunnan tobacco extract, 2 parts PVA, 1 part tobacco flavoring, and 85 parts water. The solid content of the coating solution is 3%, and the viscosity is 550 mPa·s. The coating solution is transferred to the surface of the first and second bodies away from the substrate using a surface spraying process. After drying, the first and second skins are formed respectively, and the reconstituted tobacco product is obtained. The quantitative amount of the first and second skins is 5 g / m². 2 The finished product weight of reconstituted tobacco is 90g / m³. 2 The thicknesses of the first and second epidermis are 80 μm and 80 μm, respectively.

[0115] Comparative Example 1

[0116] Unlike Example 1, the reconstituted tobacco leaves in Comparative Example 1 do not contain leaf base, first epidermis and second epidermis, but only first body and second body. The preparation methods of the first body and second body are the same as those in Example 1.

[0117] Comparative Example 2

[0118] Unlike Example 2, the slurry-process reconstituted tobacco in Comparative Example 2 does not contain leaf base, first epidermis and second epidermis, but only first body and second body. The preparation methods of the first body and second body are the same as those in Example 2.

[0119] Comparative Example 3

[0120] Unlike Example 3, the reconstituted tobacco leaf produced by the papermaking method in Comparative Example 3 does not contain the first and second epidermis, but only contains a substrate, a first body, and a second body. The preparation methods for the substrate, the first body, and the second body are the same as in Example 3; wherein, the basis weight of the substrate is 55 g / m³. 2 .

[0121] Comparative Example 4

[0122] Unlike Example 4, the dry-processed reconstituted tobacco in Comparative Example 4 does not contain the first and second epidermis, but only contains a leaf base, a first body, and a second body. The preparation methods of the leaf base, the first body, and the second body are the same as in Example 4; wherein, the quantitative amount of the leaf base is 40 g / m³. 2 .

[0123] Performance testing:

[0124] In the above examples and comparative examples, the quantitative determination of the film base, body, skin, semi-finished product, and finished product was carried out in accordance with GB / T 451.2-2002; the moisture content was determined in accordance with YC / T 31 1996; the tensile strength and elongation were determined in accordance with GB / T12914 2008; the air permeability was determined in accordance with GB / T 23227-2018; the powdering rate was determined in accordance with JJF (Light Industry) 159-2021; and the sensory quality was evaluated in accordance with YC / T498 2014 and GB 5606.4 2005. The test results are shown in Table 1.

[0125] Table 1

[0126]

[0127] As shown in the table above, compared with Comparative Examples 1-4, the tensile index of the reconstituted tobacco leaves prepared in Examples 1-4 is significantly increased, indicating a significant increase in tensile strength. Simultaneously, the elongation is significantly increased, indicating a significant improvement in the flexibility of the reconstituted tobacco leaves prepared in this application; the reduced dusting rate indicates enhanced surface strength and improved processing resistance. Furthermore, the sensory quality of the reconstituted tobacco leaves is also significantly improved.

[0128] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative base and ultra-thin epidermis, characterized in that, Includes the following steps: S1. Preparation of ultra-low basis weight sheet base using a crescent-shaped paper machine; S2. Prepare the bulk coating solution; S3. The bulk coating liquid is transferred to the upper and lower surfaces of the ultra-low quantitative substrate to form the first bulk and the second bulk, respectively, and dried to obtain the reconstituted tobacco semi-finished product. S4. Prepare the epidermal coating solution; S5. The epidermal coating liquid is transferred to the upper and lower surfaces of the reconstituted tobacco semi-finished product to form the first epidermal layer and the second epidermal layer, respectively, to obtain reconstituted tobacco. The quantitative amount of the ultra-low quantitative tablet base is 8 g / m³. 2 ~20g / m 2 The quantitative amount of the first body is 15 g / m³. 2 ~40g / m 2 The quantitative amount of the second body is 15 g / m³. 2 ~40g / m 2 The quantitative amount of the first epidermis was 1 g / m³. 2 ~4g / m 2 The quantitative amount of the second epidermis was 1 g / m³. 2 ~4g / m 2 The thickness of the first epidermis is 10μm~200μm, and the thickness of the second epidermis is 10μm~200μm.

2. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis according to claim 1, characterized in that, It satisfies at least one of the following characteristics: (1) The quantitative amount of the reconstituted tobacco leaf is 40 g / m³. 2 ~108g / m 2 ; (2) The tensile index of the reconstituted tobacco leaf is 10 N·m·g. -1 ~30 N·m·g -1 ; (3) The static contact angle of the first epidermis is 80°~120°; (4) The static contact angle of the second epidermis is 80°~120°; (5) The sensory quality score of the reconstituted tobacco leaves is 80-90 points; (6) The powder loss rate of the reconstituted tobacco leaves during shredding is ≤2%; (7) The air permeability of the reconstituted tobacco leaf is 1000CU~3000CU; (8) The thickness of the first epidermis is 50 μm to 150 μm; (9) The thickness of the second epidermis is 50μm~150μm.

3. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis according to claim 2, characterized in that, It satisfies at least one of the following characteristics: (1) The quantitative amount of the reconstituted tobacco leaf is 60 g / m³. 2 ~90g / m 2 ; (2) The tensile index of the reconstituted tobacco leaf is 15 N·m·g. -1 ~25 N·m·g -1 ; (3) The static contact angle of the first epidermis is 90°~110°; (4) The static contact angle of the second epidermis is 90°~110°; (5) The sensory quality score of the reconstituted tobacco leaves is 82-85 points; (6) The powder loss rate of the reconstituted tobacco leaves is ≤1.5%.

4. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis according to any one of claims 1 to 3, characterized in that, The crescent paper machine includes a crescent molder, a headbox, and a Yankee dryer.

5. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis according to any one of claims 1 to 3, characterized in that, The quantitative amount of the ultra-low quantitative film base is 8 g / m³. 2 ~15g / m 2 .

6. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis according to any one of claims 1 to 3, characterized in that, The components of the body coating liquid, by mass parts, include 5-35 parts tobacco particles, 4-12 parts smoking agent, 2-9 parts adhesive, 2-6 parts tobacco extract, 1-3 parts dispersant, 1-3 parts stabilizer, 1-3 parts tobacco flavoring and 70-95 parts water.

7. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative substrate and ultra-thin epidermis according to claim 6, characterized in that, It satisfies at least one of the following characteristics: (1) The solid content of the bulk coating liquid is 12%~22%; (2) The viscosity of the bulk coating liquid is 800 Pa·s to 2000 Pa·s; (3) The coating rate of the bulk coating liquid is 78%~80%; (4) The coating amount of the bulk coating liquid is 30 g / m³. 2 ~80g / m 2 .

8. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis according to any one of claims 1 to 3, characterized in that, The components of the epidermal coating liquid, by weight, include 1-3 parts paraffin emulsion, 2-4 parts carboxymethyl cellulose, 1-2 parts xanthan gum, 2-4 parts tobacco extract, 1-3 parts polyvinyl alcohol, 1-2 parts tobacco flavoring, and 80-90 parts water.

9. The method for preparing reconstituted tobacco leaves with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis according to claim 8, characterized in that, It satisfies at least one of the following characteristics: (1) The solid content of the epidermal coating liquid is 6%~15%; (2) The viscosity of the epidermal coating liquid is 200 Pa·s to 800 Pa·s; (3) The coating rate of the epidermal coating solution is 1%~10%; (4) The coating amount of the epidermal coating liquid is 2 g / m². 2 ~8g / m 2 .

10. A reconstituted tobacco leaf with high aroma and high surface strength containing ultra-low quantitative leaf base and ultra-thin epidermis, characterized in that, The reconstituted tobacco leaf is prepared by any one of claims 1 to 9, and comprises a first epidermis, a first body, an ultra-low quantitative substrate, a second body, and a second epidermis arranged in sequence.

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