A method for preparing tobacco-based box sheets based on cigarette rods

Abstract

The present invention provides a method for preparing tobacco-based box sheets based on cigarette rods, comprising the following steps: mixing a 20-30 mm cigarette rod segment with water, adding laccase, polysaccharide cleavage monooxygenase and Na2S2O8 in sequence, adjusting the pH to 7.5-8.5, reacting to obtain a pre-treated pulp; pulping the pre-treated pulp with a conjugated twin-screw extruder, screening to obtain a tobacco pulp fiber raw material; making the tobacco pulp fiber raw material into base paper, and then making tobacco-based box sheets. The method adopts a bio-enzyme method for pulping, does not require bleaching, is conducive to the recycling of waste resources, and is consistent with the concept of sustainable development. Using the bio-enzyme method, no other toxic and harmful substances participate in the reaction, so it is highly safe and the reaction process is controllable. The prepared box sheet has excellent mechanical properties.

Description

Technical Field

[0001] This invention belongs to the field of tobacco box preparation technology, and particularly relates to a method for preparing tobacco base box sheets based on tobacco stems. Background Technology

[0002] my country ranks first in the world in both tobacco planting area and output, and tobacco cultivation and processing play a vital role in national economic development. However, with the continuous improvement of rural living standards, after the annual harvesting and purchase of tobacco leaves, the tobacco stalks, which were once used as rural fuel, are now turned into waste. They are either discarded in the fields, forming agricultural solid waste and polluting soil and water bodies, or dried and burned, causing air pollution. This not only damages the ecological environment but also wastes usable resources. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for preparing tobacco-based box sheets based on tobacco sticks. This method uses a bio-enzymatic pulping process, which does not require bleaching, is conducive to the recycling of waste resources, and is in line with the concept of sustainable development.

[0004] This invention provides a method for preparing tobacco-based box sheets based on tobacco stems, comprising the following steps:

[0005] Mix 20-30mm tobacco stalk segments with water, then add laccase, polysaccharide lysis monooxygenase and Na2S2O8 in sequence, adjust the pH to 7.5-8.5, and react to obtain pretreated slurry.

[0006] The pretreated pulp was pulped using a conjugate twin-screw extruder and screened to obtain tobacco pulp fiber raw material;

[0007] The tobacco pulp fiber raw material is made into base paper, which is then made into tobacco base box sheets.

[0008] This invention involves mixing 20-30mm tobacco stalk segments with water, adding laccase, polysaccharide cleaving monooxygenase (LPMO), and Na₂S₂O₈, adjusting the pH to 7.5-8.5, and reacting to obtain a pretreated slurry. Preferably, laccase, LPMO, and Na₂S₂O₈ are added sequentially. Na₂HPO₄ is preferably used to adjust the pH. In this invention, the laccase decomposes lignin in the tobacco stalks. LPMO breaks glycosidic bonds through oxidation to produce oligosaccharide chains, exposing more glycosidic hydrolase binding sites, thereby accelerating the reaction process. Na₂S₂O₈ accelerates lignin removal.

[0009] In this invention, the mass ratio of the 20-30mm tobacco rod section to water is 1:5 to 1:7; specifically, the mass ratio of the 20-30mm tobacco rod section to water is 1:5, 1:6, or 1:7.

[0010] In this invention, the amount of laccase used is 30-80 IU per gram of oven-dried tobacco raw material; the mass ratio of laccase to polysaccharide cleavage monooxygenase is 3:1-5:1; and the mass ratio of Na2S2O8 to laccase is 1:2-1:5. Specifically, the amount of laccase used is 30 IU, 40 IU, 50 IU, 60 IU, 70 IU, or 80 IU per gram of oven-dried tobacco raw material; in a specific embodiment, the amount of laccase used is 30 IU or 80 IU per gram of oven-dried tobacco raw material.

[0011] In this invention, the mass ratio of laccase to polysaccharide cleavage monooxygenase is 3:1 to 5:1; in specific embodiments, the mass ratio of laccase to polysaccharide cleavage monooxygenase is 3:1 or 5:1.

[0012] In this invention, the mass ratio of Na2S2O8 to laccase is 1:2 to 1:5; in specific embodiments, the mass ratio of Na2S2O8 to laccase is 1:2 or 1:5.

[0013] In this invention, the reaction temperature is 35~55℃ and the reaction time is 3~5h. In a specific embodiment, the reaction temperature is 35℃ or 50℃; and the reaction time is 3h or 5h.

[0014] After obtaining the pretreated pulp, the present invention uses a conjugate twin-screw mill for pulping and screening to obtain tobacco pulp fiber raw material. The method for preparing tobacco pulp provided by the present invention uses a conjugate twin-screw mill, which, compared to traditional disc milling, not only improves the yield of tobacco pulp but also reduces energy consumption. In the present invention, the twin-screw mill uses a screw diameter of 180 mm, a rotation speed of 200-400 rpm, a pulping temperature of 70-80℃, a twin-screw current of 450-600 A, and a production capacity of 235-360 kg / h. The pulp obtained from the conjugate twin-screw mill is screened using a vibrating screen, which is a high-frequency vibrating frame flat screen. Unselected pulp flows into the screen frame from the feed box. Under the action of pressure difference and screen plate vibration, fibers pass through the screen holes, preferably 0.18-0.22 mm, more preferably 0.2 mm, to obtain tobacco pulp fiber raw material.

[0015] This invention involves processing the tobacco pulp fiber raw material into base paper, which is then used to produce tobacco base box sheets. In this invention, the basis weight of the base paper is 50-250 g / m³. 2 The moisture content is 5.5±1%; in a specific embodiment, the basis weight of the base paper is 150 g / m². 2 Or 250 g / m 2The moisture content is 5.5%. This invention uses an embossing method to prepare the box sheet. The allowable tolerance for the cutting dimensions should be ±0.2mm of the design value. Relevant patterns and text are embossed on the box sheet using a cardboard embossing machine, with an embossing depth of 0.2~0.3mm.

[0016] This invention uses tobacco sticks to make pulp and form tobacco-based box sheets without adding any other chemical reagents. The prepared tobacco-based box sheets have a rich tobacco aroma and are free of other pollutants. The brand logo is directly engraved on the box sheet without using printing processes, which greatly reduces pollutants and environmental pollution.

[0017] In this invention, the longitudinal indentation stiffness of the tobacco base sheet is 60-80g, the transverse indentation stiffness is 45-65g, the tensile index is 10-25 N·m / g, and the tear index is 2.5-4.0 mN·m. 2 / g, with a bursting index of 1.0~1.5kPa·m 2 / g.

[0018] This invention uses GB / T 451.2 for basis weight testing of base paper; GB / T 462 for moisture testing; YC / T 330-2009 for indentation stiffness testing; GB / T 12914 for tensile index testing; GB / T 455-2002 for tear index testing; and GB / T 454-2002 for bursting index testing.

[0019] This invention provides a method for preparing tobacco-based box sheets from tobacco stalks, comprising the following steps: mixing 20-30mm tobacco stalk segments with water, sequentially adding laccase, polysaccharide cleavage monooxygenase, and Na₂S₂O₈, adjusting the pH to 7.5-8.5, and reacting to obtain a pretreated pulp; using a conjugate twin-screw pulping process, screening the pretreated pulp to obtain tobacco pulp fiber raw material; processing the tobacco pulp fiber raw material into base paper, and then processing it into tobacco-based box sheets. This method uses a bio-enzymatic pulping process, eliminating the need for bleaching, which facilitates the recycling of waste resources and aligns with the concept of sustainable development. The bio-enzymatic method eliminates the participation of other toxic and harmful substances in the reaction, thus ensuring high safety and controllable reaction process. The prepared box sheets exhibit excellent mechanical properties. Detailed Implementation

[0020] To further illustrate the present invention, the following detailed description of a method for preparing tobacco-based box sheets based on tobacco stems, in conjunction with embodiments, is provided by the present invention, but these descriptions should not be construed as limiting the scope of protection of the present invention. Example 1

[0021] (1) Laccase-LPMO treatment: Cut the tobacco stick raw material into 30mm segments, mix the tobacco stick and water evenly according to the solid-liquid ratio (mass of oven-dried tobacco stick:mass of water) 1:5, add laccase, LPMO and Na2S2O8 in sequence, the amount of laccase is 30IU per gram of oven-dried tobacco stick raw material, the ratio of laccase to LPMO is 3:1, the ratio of Na2S2O8 to laccase is 1:2, add Na2HPO4 to adjust the pH to 7.5, the reaction time is 3h, and the temperature is 35℃;

[0022] (2) Conjugate twin-screw pulping: The pretreated pulp from (1) is pulped using a conjugate twin-screw pulping process. The screw diameter is 180 mm, the rotation speed is 300 rpm, the reaction temperature is 70℃, the twin-screw current is 450 A, and the production capacity is 235 kg / h. The pulp after passing through the conjugate twin-screw pulping process is screened using a vibrating screen. The vibrating screen is a high-frequency vibrating frame flat screen. Unselected pulp flows into the screen frame from the feed box. Under the action of pressure difference and screen plate vibration, the fibers pass through the screen holes, which are 0.2 mm in size. Tobacco fiber raw material is obtained.

[0023] (3) Preparation of tobacco base cassette sheets: Based on (2) tobacco pulp fiber raw materials, 150g / m³ of tobacco base cassette sheets were produced using the traditional papermaking method. 2 The base paper with a moisture content of 5.5% is cut into box pieces using traditional methods.

[0024] This invention uses a cardboard embossing machine to emboss relevant patterns and text on box sheets, with an embossing depth of 0.2 mm. The patterns and text should comply with GB5606.2 and relevant national laws and regulations.

[0025] The prepared box sheet had a longitudinal indentation stiffness of 65.9 g, a transverse indentation stiffness of 53.2 g, a tensile index of 13.5 N·m / g, and a tear index of 2.5 mN·m. 2 / g, bursting index 1.1kPa·m 2 / g. Example 2

[0026] (1) Laccase-LPMO treatment: Cut the tobacco rod raw material into 20mm segments, mix the tobacco rod and water evenly according to the solid-liquid ratio (mass of oven-dried tobacco rod:mass of water) 1:5, add laccase, LPMO and Na2S2O8 in sequence, the amount of laccase is 80IU per gram of oven-dried tobacco rod raw material, the ratio of laccase to LPMO is 5:1, the ratio of Na2S2O8 to laccase is 1:5, add Na2HPO4 to adjust the pH to 8.5, the reaction time is 5h, and the temperature is 50℃;

[0027] (2) Conjugate twin-screw pulping: The pretreated pulp from (1) is pulped using a conjugate twin-screw pulping process. The screw diameter is 180 mm, the rotation speed is 400 rpm, the reaction temperature is 75℃, the twin-screw current is 600 A, and the production capacity is 360 kg / h. The pulp after passing through the conjugate twin-screw pulping process is screened using a vibrating screen. The vibrating screen is a high-frequency vibrating frame flat screen. Unselected pulp flows into the screen frame from the feed box. Under the action of pressure difference and screen plate vibration, the fibers pass through the screen holes, which are 0.2 mm in size. Tobacco fiber raw materials are obtained.

[0028] (3) Preparation of tobacco base sheet: Based on (2) tobacco pulp fiber raw material, 250g / m200g / m3 ... 2 The base paper with a moisture content of 5.5% is cut into box pieces using traditional methods.

[0029] Use a cardboard embossing machine to emboss the relevant patterns and text onto the box sheet, with an embossing depth of 0.3mm. The patterns and text should comply with GB5606.2 and the requirements of relevant national laws and regulations.

[0030] The prepared box sheet had a longitudinal indentation stiffness of 78.5 g, a transverse indentation stiffness of 64.1 g, a tensile index of 23.4 N·m / g, and a tear index of 3.7 mN·m. 2 / g, bursting index 1.5kPa·m 2 / g.

[0031] As can be seen from the above embodiments, the present invention provides a method for preparing tobacco-based box sheets based on tobacco stems. First, tobacco pulp is obtained through bio-enzyme treatment, followed by processing with a conjugate twin-screw extruder. Subsequently, tobacco-based box sheets are fabricated according to actual needs. This method is simple and environmentally friendly. The tobacco-based box sheets provided by the present invention are obtained through tobacco stem pulping and fabrication, which is conducive to the recycling of waste resources and consistent with the concept of sustainable development. Furthermore, the tobacco-based box sheets prepared by the present invention possess the natural aroma of tobacco and can be directly engraved on the box sheets, avoiding pollution caused by printing. The tobacco-based box sheets prepared by this method have excellent mechanical properties: longitudinal indentation stiffness of 60-80g, transverse indentation stiffness of 45-65g, tensile index of 10-25 N·m / g, and tear index of 2.5-4.0 mN·m. 2 / g, with a bursting index of 1.0~1.5kPa·m 2 / g.

[0032] 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 a tobacco-based box sheet based on a cigarette rod, comprising the following steps: Mix 20-30 mm tobacco stem segments with water, add laccase, polysaccharide cleavage monooxygenase and Na2S2O8, adjust the pH to 7.5-8.5, react, and obtain a pretreated slurry; The pretreated pulp is pulped by a conjugate twin-screw extruder, and screened to obtain tobacco pulp fiber raw material; The tobacco pulp fiber raw material is made into base paper, and then into tobacco-based box sheets; The dosage of the laccase is 30-80 IU per gram of absolutely dry tobacco stem raw material; The mass ratio of laccase to polysaccharide-cleaving monooxygenase is 3:1~5:1; The mass ratio of Na2S2O8 and laccase is 1:2~1:

5.

2. The preparation method according to claim 1, characterized in that: The reaction temperature is 35~55℃ and the reaction time is 3~5h.

3. The preparation method according to claim 1, characterized in that: The mass ratio of the 20~30mm cigarette stem segment to water is 1:5~1:

7.

4. The preparation method according to claim 1, characterized in that: The screw diameter used in twin-screw pulping is 180mm, the rotation speed is 200~400rpm, the pulping temperature is 70~80℃, and the twin-screw current is 450~600A.

5. The preparation method according to claim 1, characterized in that: The screening adopts a vibrating pulp screen; the vibrating screen is a high-frequency vibrating frame flat screen.

6. The preparation method according to claim 1, characterized in that: The sieve opening used for screening is 0.18~0.22mm.

7. The preparation method according to claim 1, characterized in that: The basis weight of base paper is 50~250g / m 2 , the moisture content is 5.5±1%.

8. The preparation method according to claim 1, characterized in that: The longitudinal indentation stiffness of tobacco-based box sheets is 60~80g, the transverse indentation stiffness is 45~65g, the tensile index is 10~25N·m / g, and the tear index is 2.5~4.0mN·m 2 / g, burst resistance index 1.0~1.5kPa·m 2 / g.