A method for preparing a tobacco carton based on dry reconstituted tobacco

Abstract

The application belongs to the technical field of tobacco, and particularly relates to a method for preparing a tobacco carton based on dry reconstituted tobacco leaves, comprising the following steps: a) cutting dry reconstituted tobacco leaves to obtain tobacco leaf sheets; b) spraying cedrol glucoside on the surface of the tobacco leaf sheets by using an electrostatic powder spraying method to obtain sprayed sheets; c) placing one or more of the sprayed sheets in a press machine, and hot-pressing and forming to obtain a tobacco carton plate; and cutting and assembling the tobacco carton plate to obtain a tobacco carton. The method provided by the application expands the application field of dry reconstituted tobacco leaves, is environmentally friendly, and has good physical strength and rich tobacco aroma.

Description

Technical Field

[0001] This invention belongs to the field of tobacco technology, and in particular relates to a method for preparing cigarette cartons based on dry reconstituted tobacco leaves. Background Technology

[0002] Cigarette cartons are an important form of cigarette packaging. Specialized machines arrange a certain number of small packs of cigarettes neatly and then package them into a carton. This packaging method plays a vital role in the transportation, storage, and sale of cigarettes, not only facilitating these processes but also effectively protecting the cigarette product. In general, cigarette cartons hold an indispensable position in the cigarette industry. They not only facilitate the transportation, storage, and sale of cigarettes but also, through their unique design and practicality, provide strong support for the marketing of cigarette brands and the consumer experience.

[0003] Currently, the production of cigarette cartons usually adopts the wet papermaking method. Wet papermaking will generate certain environmental pollution during the production process, with water pollution being the most serious. For every ton of pulp produced, tens or even hundreds of tons of water are usually required. In addition, the wastewater contains a large amount of organic matter, such as lignin and cellulose, with high biochemical oxygen demand (BOD) and a lot of suspended solids (SS). Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for preparing tobacco cartons based on dry reconstituted tobacco leaves. This method expands the application field of dry reconstituted tobacco leaves, is environmentally friendly, and the resulting tobacco cartons have good physical strength and are rich in tobacco aroma.

[0005] This invention provides a method for preparing cigarette cartons based on dry reconstituted tobacco leaves, comprising the following steps:

[0006] a) Cut dry-processed reconstituted tobacco leaves to obtain tobacco leaf material;

[0007] b) Coniferyl alcohol glucoside was sprayed onto the surface of the tobacco leaf material using an electrostatic powder spraying method to obtain the sprayed sheet material;

[0008] c) Place one or more of the sprayed sheets in a press and hot-press them to form a cigarette pack board; cut and assemble the cigarette pack board to obtain a cigarette pack.

[0009] Preferably, in step b), the particle size of the coniferyl glucoside is 300-400 mesh.

[0010] Preferably, in step b), the amount of coniferyl glucoside sprayed is 0.1 to 0.3 wt% of the oven-dry weight of the tobacco leaf material.

[0011] Preferably, in step b), the spraying voltage is 50–90 kV; the spraying current density is 0.5–2 mA / cm². 2 .

[0012] Preferably, in step b), the spraying distance is 15-25 cm and the spraying speed is 10-20 m / min.

[0013] Preferably, in step c), the temperature of the hot pressing is 85-95°C, and the pressure of the hot pressing is 8-9 MPa.

[0014] Preferably, in step c), the hot pressing time is 2 to 3 minutes.

[0015] Preferably, the process further includes: d) collecting the scraps cut in steps a) and c), crushing them, pressing them in a mold to obtain a cigarette carton board; cutting and assembling the cigarette carton board to obtain a cigarette carton.

[0016] Preferably, in step d), the particle size of the pulverized material is 30-50 mesh.

[0017] Preferably, in step d), the pressing pressure is 20-30 MPa.

[0018] Compared with existing technologies, this invention provides a method for preparing cigarette cartons based on dry reconstituted tobacco leaves, comprising the following steps: a) cutting dry reconstituted tobacco leaves to obtain tobacco leaf material; b) spraying coniferyl glucoside onto the surface of the tobacco leaf material using an electrostatic powder coating method to obtain a coated sheet; c) placing one or more coated sheets in a press and hot-pressing them to obtain a cigarette carton board; cutting and assembling the cigarette carton board to obtain a cigarette carton. The method provided by this invention expands the application field of dry reconstituted tobacco leaves, is environmentally friendly, and the resulting cigarette carton has good physical strength and a rich tobacco aroma. Detailed Implementation

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

[0020] This invention provides a method for preparing cigarette cartons based on dry reconstituted tobacco leaves, comprising the following steps:

[0021] a) Cut dry-processed reconstituted tobacco leaves to obtain tobacco leaf material;

[0022] b) Coniferyl alcohol glucoside was sprayed onto the surface of the tobacco leaf material using an electrostatic powder spraying method to obtain the sprayed sheet material;

[0023] c) Place one or more of the sprayed sheets in a press and hot-press them to form a cigarette pack board; cut and assemble the cigarette pack board to obtain a cigarette pack.

[0024] In the method provided by this invention, in step a), the dry reconstituted tobacco leaf contains an adhesive, which includes, but is not limited to, carboxymethyl cellulose. More specifically, the dry reconstituted tobacco leaf uses a dry sheet substrate obtained by air-laid coating process as a coating substrate, and a coating liquid containing tobacco particles, tobacco extract, adhesive and other components is transferred to the substrate surface through multiple coating processes, followed by multi-stage drying to obtain the finished reconstituted tobacco leaf.

[0025] In the method provided by the present invention, in step a), the shape of the cut is preferably square, and more preferably rectangular.

[0026] In the method provided by the present invention, in step b), the particle size of the coniferyl glucoside is preferably 300-400 mesh, specifically 300 mesh, 310 mesh, 320 mesh, 330 mesh, 340 mesh, 350 mesh, 360 mesh, 370 mesh, 380 mesh, 390 mesh or 400 mesh.

[0027] In the method provided by this invention, in step b), the amount of coniferyl glucoside sprayed is preferably 0.1 to 0.3 wt% of the oven-dry weight of the tobacco leaf material, specifically 0.1 wt%, 0.11 wt%, 0.12 wt%, 0.13 wt%, 0.14 wt%, 0.15 wt%, 0.16 wt%, 0.17 wt%, 0.18 wt%, 0.19 wt%, 0.2 wt%, 0.21 wt%, 0.22 wt%, 0.23 wt%, 0.24 wt%, 0.25 wt%, 0.26 wt%, 0.27 wt%, 0.28 wt%, 0.29 wt%, or 0.3 wt%.

[0028] In the method provided by this invention, in step b), the spraying voltage is preferably 50-90kV, specifically 50kV, 55kV, 60kV, 65kV, 70kV, 75kV, 80kV, 85kV, or 90kV; the spraying current density is preferably 0.5-2mA / cm². 2 Specifically, it can be 0.5 mA / cm. 2 0.6mA / cm 2 0.7mA / cm 2 0.8mA / cm 2 0.9mA / cm 2 1mA / cm2 1.1 mA / cm 2 1.2mA / cm 2 1.25mA / cm 2 1.3mA / cm 2 1.4mA / cm 2 1.5mA / cm 2 1.6mA / cm 2 1.7mA / cm 2 1.8mA / cm 2 1.9 mA / cm 2 or 2mA / cm 2 The preferred spraying distance is 15-25cm, specifically 15cm, 16cm, 17cm, 18cm, 19cm, 20cm, 21cm, 22cm, 23cm, 24cm or 25cm; the preferred spraying speed is 10-20m / min, specifically 10m / min, 11m / min, 12m / min, 13m / min, 14m / min, 15m / min, 16m / min, 17m / min, 18m / min, 19m / min or 20m / min.

[0029] In the method provided by this invention, in step c), the temperature of the hot pressing is preferably 85-95°C, specifically 85°C, 86°C, 87°C, 88°C, 89°C, 90°C, 91°C, 92°C, 93°C, 94°C, or 95°C; the pressure of the hot pressing is preferably 8-9 MPa, specifically 8 MPa, 8.1 MPa, 8.2 MPa, 8.3 MPa, 8.4 MPa, 8.5 MPa, 8.6 MPa, 8.7 MPa, 8.8 MPa, 8.9 MPa, or 9 MPa; the time of the hot pressing is preferably 2-3 min, specifically 2 min, 2.1 min, 2.2 min, 2.3 min, 2.4 min, 2.5 min, 2.6 min, 2.7 min, 2.8 min, 2.9 min, or 3 min.

[0030] In the method provided by the present invention, the following steps are preferably included: d) collecting the scraps cut in steps a) and c), crushing them, placing them in a mold and pressing them to obtain a cigarette carton board; cutting the cigarette carton board and assembling it to obtain a cigarette carton.

[0031] In the method provided by the present invention, in step d), the mass ratio of the scrap material in step a) to the scrap material in step c) is preferably 1:(1 to 5), specifically 1:1, 1:2, 1:3, 1:4 or 1:5.

[0032] In the method provided by the present invention, in step d), the particle size of the pulverized material is preferably 30 to 50 mesh, specifically 30 mesh, 35 mesh, 40 mesh, 45 mesh or 50 mesh.

[0033] In the method provided by this invention, in step d), the pressing temperature is preferably 85-95℃, specifically 85℃, 86℃, 87℃, 88℃, 89℃, 90℃, 91℃, 92℃, 93℃, 94℃ or 95℃; the pressing pressure is preferably 20-30MPa, specifically 20MPa, 21MPa, 22MPa, 23MPa, 24MPa, 25MPa, 26MPa, 27MPa, 28MPa, 29MPa or 30MPa; the pressing time is preferably 2-3min, specifically 2min, 2.1min, 2.2min, 2.3min, 2.4min, 2.5min, 2.6min, 2.7min, 2.8min, 2.9min or 3min.

[0034] The method provided by this invention expands the application field of dry reconstituted tobacco leaves, is environmentally friendly, and produces tobacco cartons with good physical strength and a rich tobacco aroma. More specifically, the method of this invention has the following advantages:

[0035] (1) Currently, the production of cigarette cartons typically employs wet papermaking. Dry papermaking has significant advantages over traditional wet papermaking: ① Environmental friendliness: The biggest advantage of dry papermaking is that it does not use water as a production medium, thus avoiding the consumption of large amounts of water resources. ② Energy saving: The production process of dry papermaking is relatively simple, without the need for energy-intensive steps such as cooking and bleaching as in wet papermaking, resulting in lower energy consumption. Dry reconstituted tobacco uses dry sheet substrate produced by air-flow web forming as the coating substrate. A coating liquid containing tobacco particles, tobacco extracts, and other components is transferred to the substrate surface through multiple coating processes, followed by multi-stage drying to obtain the finished reconstituted tobacco product. Therefore, the process of preparing cigarette cartons based on dry reconstituted tobacco is energy-saving and environmentally friendly, and the finished product is rich in tobacco aroma.

[0036] (2) In the dry-process reconstituted tobacco production process, adhesives play a crucial role. Adhesives can effectively bond tobacco fragments such as tobacco stems and dust together to form reconstituted tobacco with a certain strength and flexibility. Therefore, under high temperature and high pressure, the adhesives will reassemble, making the bonding between fibers tighter and giving the tobacco carton better physical strength.

[0037] (3) Coniferyl glucoside is a lignin precursor with a variety of important biological and chemical properties. This compound can polymerize with polysaccharides under the action of enzymes to generate dehydrogenated polymers (DHP) and complexes formed by these polymers and holocellulose. Coniferyl glucoside can inhibit fungal growth and blackening reactions; therefore, cigarette packs prepared with coniferyl glucoside have antibacterial properties.

[0038] For clarity, the following examples will be used to provide a detailed description.

[0039] In the following embodiments provided by the present invention, the dry-processed reconstituted tobacco leaves were prepared according to the following method:

[0040] (1) Hydrothermal treatment: Take 50-mesh tobacco straw powder and deionized water at a ratio of 1:8 and mix them evenly. Then, heat the mixture to 160°C in a hydrothermal reactor (with continuous stirring) and keep it at that temperature for 1.5 hours. After cooling, take out the mixture and filter it to obtain the hydrothermal treatment raw material and tobacco extract.

[0041] (2) Preparation of sulfate-process softwood pulp: The ratio of spruce wood to cooking liquor is 1:5, the amount of alkali (referring to the percentage of sodium hydroxide in the amount of oven-dry raw material during cooking) is 18%, the degree of sulfidation is 25%, the amount of anthraquinone is 0.05%, the maximum cooking temperature is 165℃, the heating time is 2 hours, and the holding time is 2.5 hours.

[0042] (3) The slurry obtained in step (2) of washing, screening and cleaning;

[0043] (4) Take the slurry obtained in step (3) and the tobacco extract prepared in step (1) at a volume ratio of 1:10, add 1 g / L vanillin, and then soak at 60℃ for 48 h.

[0044] (5) After the pulp in step (4) is dried, fluff pulp fibers are obtained. The fluff pulp fibers are sent to the molding device by the feeding blower. They are dispersed into dispersed fibers by the high-speed rotation of the dispersing roller. Then, they are filtered through a round screen. Under the adsorption of the negative pressure box, the wood pulp fibers are evenly dropped onto the molding mesh belt to obtain a substrate with a thickness of 0.6 mm.

[0045] (6) Prepare a coating solution (containing 300-mesh Burley tobacco powder particles, carboxymethyl cellulose adhesive, and glycerin atomizing agent). The mass concentration of tobacco powder in the coating solution is 30%, the mass concentration of adhesive is 1%, and the mass concentration of atomizing agent is 5%. Coat the substrate surface in step (5) with the coating solution. The coating thickness of the coating solution is 1 mm.

[0046] (7) The substrate coated with the coating liquid obtained in step (6) is dried in multiple stages to obtain dry reconstituted tobacco leaves; the drying system of the multiple stages has a total of 5 ovens, the hot air temperature is 100℃, and the speed is 100m / min.

[0047] The basic performance parameters of the dry reconstituted tobacco leaves obtained by the above method are as follows: Quantitative weight: 218.1 g / m³ 2 Tensile strength: 22.85 N·m / g, elongation: 1.88%, tear resistance: 5.25 mN·m 2 / g.

[0048] Example 1

[0049] (1) Cutting: Cut the dry reconstituted tobacco leaves into rectangles of 40cm×50cm;

[0050] (2) Spraying coniferyl glucoside: Coniferyl glucoside is ground into 300-mesh particles and sprayed onto the surface of dry reconstituted tobacco leaves using electrostatic powder spraying; wherein, the amount of coniferyl glucoside is 0.1 wt% of the oven-dried reconstituted tobacco leaf mass, the spraying voltage is 50 kV, and the spraying current density is 0.5 mA / cm². 2 The spraying distance is 15cm and the spraying speed is 10m / min;

[0051] (3) Hot pressing and carton assembly: The dry reconstituted tobacco leaves sprayed with coniferyl glucoside are placed in a press at a temperature of 85℃, a pressure of 8MPa and a time of 2min to obtain a tobacco carton board; the tobacco carton board is cut and assembled to obtain a tobacco carton ①.

[0052] (4) Collect the remaining scraps from (1) and (3), mix them evenly at a mass ratio of 1:2, and then crush them to 30 mesh. Press them into shape in a mold with a length of 40cm, a width of 50cm, and a height of 1.5mm. Press them at a temperature of 85℃, a pressure of 20MPa, and a time of 2min to obtain a cigarette carton board. Cut and assemble the cigarette carton board to obtain a cigarette carton ②.

[0053] Example 2

[0054] (1) Cutting: Cut the dry reconstituted tobacco leaves into rectangles of 40cm×50cm;

[0055] (2) Spraying coniferyl glucoside: Coniferyl glucoside is ground into 350-mesh particles and sprayed onto the surface of dry reconstituted tobacco leaves using electrostatic powder spraying; wherein, the amount of coniferyl glucoside is 0.2wt% of the weight of the oven-dried reconstituted tobacco leaves, the spraying voltage is 70kV, and the spraying current density is 1.25mA / cm 2The spraying distance is 20cm and the spraying speed is 15m / min;

[0056] (3) Hot pressing and carton assembly: The dry reconstituted tobacco leaves sprayed with coniferyl glucoside are placed in a press at a temperature of 90℃, a pressure of 8.5MPa and a time of 2.5min to obtain a tobacco carton board; the tobacco carton board is cut and assembled to obtain a tobacco carton ①.

[0057] (4) Collect the remaining scraps from (1) and (3), mix them evenly at a mass ratio of 1:2, and then crush them to 40 mesh. Press them into shape in a mold with a length of 40cm, a width of 50cm, and a height of 1.5mm. Press them at a temperature of 90℃, a pressure of 25MPa, and a time of 2.5min to obtain a cigarette carton board. Cut and assemble the cigarette carton board to obtain a cigarette carton ②.

[0058] Example 3

[0059] (1) Cutting: Cut the dry reconstituted tobacco leaves into rectangles of 40cm×50cm;

[0060] (2) Spraying coniferyl glucoside: Coniferyl glucoside is ground into 400-mesh particles and sprayed onto the surface of dry reconstituted tobacco leaves using electrostatic powder spraying; wherein, the amount of coniferyl glucoside is 0.3wt% of the weight of the oven-dried reconstituted tobacco leaves, the spraying voltage is 90kV, and the spraying current density is 2mA / cm 2 The spraying distance is 25cm and the spraying speed is 20m / min;

[0061] (3) Hot pressing and carton assembly: The dry reconstituted tobacco leaves sprayed with coniferyl glucoside are placed in a press at a temperature of 95℃, a pressure of 9MPa and a time of 3min to obtain a tobacco carton board; the tobacco carton board is cut and assembled to obtain a tobacco carton ①.

[0062] (4) Collect the remaining scraps from (1) and (3), mix them evenly at a mass ratio of 1:2, and then crush them to 50 mesh. Press them into shape in a mold with a length of 40cm, a width of 50cm, and a height of 1.5mm. Press them at a temperature of 95℃, a pressure of 30MPa, and a time of 3min to obtain a cigarette carton board. Cut and assemble the cigarette carton board to obtain a cigarette carton ②.

[0063] Performance Evaluation

[0064] The performance of the cigarette pack plates prepared in Examples 1-3 of this invention was tested. The specific test methods and results are as follows:

[0065] (1) Static bending strength analysis (three-point bending)

[0066] The static bending strength of a three-point bending test is determined by applying a load to the middle of a two-point supported specimen. It is the ratio of the bending moment to the section modulus of bending at maximum load. A specimen measuring 15mm × 200mm is cut and placed in an environment with a temperature of (20±2)℃ and a relative humidity of (65±5)% until its mass becomes constant. Constant mass is considered achieved when the difference between two weighings 24 hours apart does not exceed 0.1% of the specimen's mass. The span between the two supports is adjusted to be at least 20 times the basic thickness of the specimen, and the center distance between the supports is measured to an accuracy of 0.5mm. The specimen is placed flat on the supports, with its long axis perpendicular to the support rollers and its center point below the loading roller.

[0067] Apply a constant loading rate throughout the test. Adjust the loading rate to reach the maximum load within (60±30) s. Record the maximum load to an accuracy of 1% of the measured value.

[0068] The static bending strength of the specimen is calculated using the following formula, accurate to 0.1 MPa:

[0069]

[0070] In the formula:

[0071] ρ b —Static bending strength of the specimen, in megapascals (MPa);

[0072] F max —The maximum load at which the specimen fails, in Newtons (N);

[0073] l1 — Distance between the two supports, in millimeters (mm);

[0074] b—sample width, in millimeters (mm);

[0075] t — Sample thickness, in millimeters (mm).

[0076] (2) Determination of internal bonding strength

[0077] Internal bond strength is the measure of a specimen's ability to withstand a uniformly distributed tensile force until failure. It is the ratio of the maximum breaking tensile force perpendicular to the specimen surface to the specimen area.

[0078] Apply epoxy resin adhesive or similar molten hot melt adhesive evenly to the surface of the clamping head, and bond the specimen and clamping head together. Remove any adhesive that has been squeezed out of the adhesive layer. Place the assembly into the clamping device and load until the specimen fails. The entire test should be uniformly loaded, and the specimen should fail within (60±30) s from the start of loading. Record the maximum load value, accurate to 1%.

[0079] The internal bond strength is calculated according to the following formula:

[0080]

[0081] In the formula:

[0082] σ ⊥ —Intra-instrumental bond strength, in megapascals (MPa);

[0083] F max —The maximum load at which the specimen fails, in Newtons (N);

[0084] l — Sample length, in millimeters (mm);

[0085] b — Sample width, in millimeters (mm).

[0086] (3) Test results:

[0087]

[0088] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing cigarette cartons based on dry reconstituted tobacco leaves, characterized in that, Includes the following steps: a) Cut dry-processed reconstituted tobacco leaves to obtain tobacco leaf material; b) Coniferyl alcohol glucoside was sprayed onto the surface of the tobacco leaf material using an electrostatic powder spraying method to obtain the sprayed sheet material; In step b), the particle size of the coniferyl alcohol glucoside is 300-400 mesh; c) Place one or more of the sprayed sheets in a press and hot-press them to form a cigarette pack board; cut and assemble the cigarette pack board to obtain a cigarette pack. In step c), the temperature of the hot pressing is 85~95℃; the pressure of the hot pressing is 8~9MPa.

2. The method according to claim 1, characterized in that, In step b), the amount of coniferyl glucoside sprayed is 0.1 to 0.3 wt% of the oven-dry weight of the tobacco leaf material.

3. The method according to claim 1, characterized in that, In step b), the spraying voltage is 50~90kV; the spraying current density is 0.5~2mA / cm. 2 .

4. The method according to claim 1, characterized in that, In step b), the spraying distance is 15~25cm; the spraying speed is 10~20m / min.

5. The method according to claim 1, characterized in that, In step c), the hot pressing time is 2-3 minutes.

6. The method according to claim 1, characterized in that, Also includes: d) Collect the scraps cut in steps a) and c), crush them, place them in a mold and press them to obtain cigarette carton board; cut the cigarette carton board and assemble it to obtain cigarette carton.

7. The method according to claim 6, characterized in that, In step d), the particle size of the pulverized material is 30-50 mesh.

8. The method according to claim 6, characterized in that, In step d), the pressing pressure is 20~30MPa.

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