A pulping process for reconstituted tobacco leaves

Abstract

The invention relates to the technical field of tobacco reconstituted tobacco leaves, and in particular to a pulping process for reconstituted tobacco leaves. In the pulping process, the particle size of powder is accurately controlled to adjust the dispersion effect of the particle size, the pulping degree and the beating degree of fiber pulp are accurately controlled by adopting pulping and circulating pulping processes, uniform pulp is obtained by a mixing method of quantitative batching and circulating homogenization, and bubbles in the pulp are eliminated by vacuuming the pulp. The obtained pulp has good uniformity and few pulp flow defects. The heated cigarette tobacco reconstituted tobacco leaf slices obtained by drying the finished pulp have high tensile strength, low density and good bulk.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco reconstituted tobacco leaves, and in particular to a pulping process for reconstituted tobacco leaves. Background Art

[0002] As people pay more and more attention to the environment and health, tobacco control campaigns are spreading all over the world, and reducing tar and harm has become the key research content and development direction of the tobacco industry in various countries around the world. Heated cigarettes are a new type of tobacco product that uses an external heat source to heat the cigarette to a point where it can volatilize and release the tobacco flavor without burning the cigarette. Compared with traditional cigarettes, it reduces the harmful substances produced by the cracking of tobacco due to high-temperature combustion, and greatly reduces the release of chemical components in mainstream smoke. Therefore, heated cigarette tobacco products are becoming more and more popular among consumers.

[0003] Different from traditional reconstituted tobacco, in the process of producing heated cigarette reconstituted tobacco, in order to make the reconstituted tobacco obtain higher strength, folding resistance, flexibility, and improve the bulk of tobacco reconstituted tobacco, it is necessary to add exogenous fibers during the slurry preparation process. The introduction of exogenous fibers greatly improves the physical indicators of tobacco reconstituted tobacco while also increasing the bulk of tobacco reconstituted tobacco. Therefore, the introduction of exogenous fibers is the core of the production of heated cigarette tobacco reconstituted tobacco. However, during the production process, due to the high viscosity of the raw material slurry, the fibers are difficult to disperse and easily flocculate in the high-concentration slurry, which causes the slurry to "draw" when it is flowing because the flocculated fiber clusters are stuck on the scraper. Once "drawing" occurs, production will be interrupted. In severe cases, the machine needs to be shut down for processing. When the product is rolled, the strength of the tobacco reconstituted tobacco will be uneven due to uneven fiber distribution, causing the tobacco reconstituted tobacco to break frequently. In addition, the uneven distribution of fibers will also directly reflect on the surface of reconstituted tobacco leaves, which will not only make the appearance quality of reconstituted tobacco leaves poor and reduce various physical indicators, but also cause uneven smoke when making heated cigarettes due to the uneven distribution of fibers, which will bring more negative effects to reconstituted tobacco leaves. The addition and dispersion of fibers are key factors that restrict the improvement of the quality of reconstituted tobacco leaves for heated cigarettes, and they must be improved.

[0004] Secondly, the thickness and gram weight uniformity requirements of reconstituted tobacco leaves used for heated cigarette tobacco products are higher than those of ordinary reconstituted tobacco leaves. The size and distribution of powder particles need to be strictly controlled during the slurry preparation process, and the moisture accuracy of the powder and the moisture content of various formulas need to be strictly controlled. In addition, the reconstituted tobacco leaves used for heated cigarette tobacco products need to be shredded in subsequent processing. The bubbles in the reconstituted tobacco leaves will seriously affect the tensile strength of the reconstituted tobacco leaves. During the slurry preparation process, the bubbles in the slurry need to be eliminated as much as possible. The temperature of the slurry has a great influence on the viscosity of the slurry, and the viscosity of the slurry has a great influence on the flow and forming of the slurry in the headbox. It is very necessary to control the temperature of the slurry.

[0005] Therefore, providing a pulping process for reconstituted tobacco leaves to solve the problems of poor slurry dispersion, low production efficiency and product quality in the process of producing heated cigarette tobacco reconstituted tobacco leaves is a technical problem that needs to be solved at present. Summary of the invention

[0006] In view of the problems existing in the prior art, after a large number of research and experiments, the present invention proposes a pulping process for reconstituted tobacco leaves, which solves the technical problems of poor pulp dispersion, low production efficiency and product quality in the process of producing heated cigarette tobacco reconstituted tobacco leaves.

[0007] The raw materials used in the slurry preparation process of the present invention include tobacco powder, raw fiber, adhesive and smoke generating agent. At least one of calcium carbonate, flavoring and other additives can be selectively added to the raw materials.

[0008] In one aspect, the present invention provides a pulping process for reconstituted tobacco, comprising the following preparation steps:

[0009] Step 1: Weigh the raw materials according to the following mass percentages:

[0010]

[0011] The total amount of the above components is 100%;

[0012] Step 2: The tobacco leaves are subjected to at least three-stage crushing processes to obtain tobacco powder, which is stored in a container for later use;

[0013] Step 3: adding raw fiber and water into a pulper for pulping at a pulping concentration of 3%-6% to obtain pulped fiber slurry;

[0014] Step 4: The crushed fiber slurry is circulated through a refiner for refining and defibration to obtain a fiber slurry with a beating degree of 60-90°SR;

[0015] Step 5: adjusting the concentration of the fiber slurry after beating and storing it for future use;

[0016] Step 6: Prepare adhesive and smoke agent and store them for future use;

[0017] Step 7: Put the prepared materials from steps 2, 5 and 6 into a mixing tank and mix them homogeneously to obtain a mixed slurry;

[0018] Step 8: The mixed slurry is transported to a buffer tank, and then transported to a finished product tank. The finished product tank is evacuated and pressure-maintained, and then the vacuum is released to defoam, thereby obtaining the slurry product for reconstituted tobacco leaves.

[0019] In the present invention, the fiber content of the raw material is 3-10% (accounting for the dry weight of the slurry). This fiber content not only enables the reconstituted tobacco to obtain sufficient physical strength, but also reduces the possibility of flocculation during the slurry preparation process, and the thickness of the reconstituted tobacco is better, and there is no obvious negative impact on the taste of the reconstituted tobacco.

[0020] Furthermore, the mass percentage of calcium carbonate added is 4-6%.

[0021] Furthermore, the weight percentage of spices or other additives added is 1-2%.

[0022] Furthermore, the raw material fiber includes at least one of wood fiber, tobacco fiber, hemp fiber, bamboo fiber, sugarcane fiber, straw fiber and cotton fiber.

[0023] Furthermore, the adhesive is at least one of guar gum, carboxymethyl cellulose, hydroxyethyl cellulose, xanthan gum, carrageenan, konjac gum, chitosan and modified starch.

[0024] Furthermore, the adhesive is a combination of chitosan and konjac gum; when the mass ratio of chitosan to konjac gum is 1:2-3, the tensile strength of the product tobacco leaves is better.

[0025] Furthermore, the smoke generating agent is at least one of glycerol, ethylene glycol, propylene glycol, sorbitol and butylene glycol.

[0026] Furthermore, the smoke generating agent is a combination of ethylene glycol and sorbitol in a mass ratio of 3-5:1.

[0027] Furthermore, in step 2, tobacco powder with a particle size between 0.125 mm and 0.25 mm is obtained.

[0028] In the present invention, the particle size of the mixed tobacco powder in the finished slurry is 60 to 120 meshes (i.e., 0.125mm-0.25mm); wherein, the finer the tobacco powder particle size, the more favorable it is for the dispersion of tobacco powder in the slurry, the better the fluidity of the prepared slurry, the better the surface quality of the reconstituted tobacco leaves, the higher the strength, but the lower the bulk thickness; the coarser the tobacco powder particle size, the poorer the fluidity of the prepared slurry, the better the bulk thickness of the obtained reconstituted tobacco leaves, but the worse the surface quality, the more defects, and the worse the strength. The present invention selects the particle size between 0.125mm-0.25mm to be favorable for the dispersion of tobacco powder in the slurry, the better the fluidity of the prepared slurry, the better the surface quality of the obtained reconstituted tobacco leaves, the high strength, and the moderate bulk thickness.

[0029] Furthermore, in step 2, the tobacco leaves are subjected to a three-stage pulverization process. In the three-stage pulverization process, the first stage pulverization controls the material size to be less than 20 mm, the second stage pulverization controls the material size to be less than 3 mm, and the third stage pulverization controls the material size to be between 0.125 mm and 0.25 mm.

[0030] Furthermore, the crushing temperature is 30-60°C.

[0031] Furthermore, the refining temperature is 30-60°C.

[0032] Furthermore, the average length of the fibers after beating is 0.1-4 mm.

[0033] In the present invention, the fiber crushing concentration is 3-6%, and the temperature is controlled at 30-60°C during the crushing process. The temperature is controlled at 30-60°C during the pulping process, the fiber pulp beating degree after pulping is 60-90°SR, and the average fiber length is 0.1-4mm. Crushing and defibrination of the fibers are beneficial to fiber separation, brooming, and swelling, which can increase the hydrogen bonding force between the fibers and increase the strength and toughness of the reconstituted tobacco leaves. The short average fiber length is conducive to the dispersion of the fibers, but the resulting reconstituted tobacco leaves have poor loose thickness and poor strength. The excessive average length of the fibers is not conducive to the dispersion and mixing of the fibers, affects the continuous production of reconstituted tobacco leaves, and the surface quality of the resulting reconstituted tobacco leaves is poor.

[0034] Furthermore, the mixing tank is provided with at least one stirring paddle, which can evenly mix various raw materials added in proportion. The stirring paddle can be set to a stirring mode with multiple rotation speeds according to the mixing effect.

[0035] Furthermore, the mixing tank is provided with a circulating homogenizing mixing bypass, and a slurry pump is provided on the circulating homogenizing mixing bypass, so that the materials in the mixing tank can be continuously circulated and mixed until they are uniform. At the same time, an abrasive device can also be provided on the circulating homogenizing mixing bypass.

[0036] Furthermore, at least two mixing tanks are provided, one for feeding and one for stirring, mixing and discharging, so that the intermittent batching process can be transformed into a continuous feeding process.

[0037] Furthermore, the material sent out from the mixing tank is sent to the buffer tank, where it continues to be mixed and circulated for homogenization.

[0038] Furthermore, the volume of the buffer tank is set to 2-5 times that of the mixing tank, so that materials from different mixing batches can enter the mixing tank, and the materials between batches can be evenly mixed through homogeneous mixing in the mixing tank.

[0039] Furthermore, after the mixed materials in the mixing tank are sent to the finished product tank, a vacuum operation is performed in the finished product tank. The finished product tank is generally set to 2 or more, at least one for feeding and vacuuming, and at least one for discharging, that is, the intermittent process is turned into a continuous process.

[0040] Furthermore, the solid content of the mixed slurry is 12wt%-22wt%.

[0041] Furthermore, the process of evacuating the finished can, maintaining pressure, and then releasing the vacuum for defoaming is as follows: evacuating the finished can to a vacuum degree less than -0.096MPa, maintaining pressure for 5-60 minutes, and then releasing the vacuum for defoaming.

[0042] Furthermore, the finished pulp preparation product can be sent to a drying section for pulping and drying to obtain heated cigarette tobacco reconstituted tobacco leaves.

[0043] On the other hand, the present invention also provides a slurry preparation product, which is obtained by the above method.

[0044] On the other hand, the present invention also provides a heated cigarette tobacco reconstituted tobacco leaf sheet, which is obtained by feeding the above-mentioned slurry preparation product into a slurry dryer for slurry drying.

[0045] On the other hand, the present invention also provides a method for preparing heated cigarette tobacco reconstituted tobacco leaf sheets, which comprises the step of feeding the above-mentioned slurry product into a slurry dryer for slurry drying.

[0046] The beneficial effects of the present invention are as follows:

[0047] The present invention accurately controls the particle size of the powder to adjust the dispersion effect of the particle size during the slurry preparation process, adopts pulping and circulating pulping processes to accurately control the degree of fragmentation and beating of the fiber slurry, obtains uniform slurry through a mixing method of quantitative batching and circulating homogenization, and eliminates bubbles in the slurry by vacuuming the slurry. The obtained slurry has good uniformity and few slurry flow defects. The heated cigarette tobacco reconstituted tobacco leaf slices obtained after the finished slurry is dried have high tensile strength, low density and good bulk.

[0048] The process provided by the present invention can continuously and stably produce heated cigarette tobacco reconstituted tobacco leaves. The present invention not only effectively reduces the generation of defects in the production and preparation process of heated cigarette tobacco raw material slurry, improves production efficiency, and stabilizes production quality, but also improves the physical indicators of heat-not-burn tobacco reconstituted tobacco leaves and improves product quality.

[0049] The slurry of the present invention has good dispersion effect, high production efficiency and product quality of thin slices. The slurry obtained by the method of the present invention has a smooth and uniform surface, without granularity, fiber agglomeration and overflow defects; the thin slices prepared by the slurry obtained by the process of the present invention have uniform powder distribution on the surface, smooth peeling surface, no holes and cracks, and moderate thickness of the thin slices, small thickness deviation, low apparent density, high bulk thickness and high tensile strength.

[0050] The present invention selects tobacco powder with a particle size between 0.125 mm and 0.25 mm and a fiber slurry with a beating degree of 60-90°SR to obtain a slurry product with better effect, so that the thickness deviation of the sheet is low, the apparent density is low, the bulk is high and the tensile strength is large, giving the tobacco sheet a better use effect. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be described below in conjunction with specific implementation methods, and the effects of the technical solution of the present invention will be made clearer and more specific.

[0052] 1. Preparation of finished slurry

[0053] Finished product 1:

[0054] A pulping process for reconstituted tobacco leaves, the preparation steps are as follows:

[0055] Step 1: Weigh the raw materials according to the following mass percentages:

[0056]

[0057] The raw material fiber is larch wood pulp fiber of coniferous wood fiber; the adhesive is a combination of chitosan (CAS No. 9012-76-4, Tianjin Guangfu Technology Development Co., Ltd., item number: gfsh204) and konjac gum (CAS No. 37220-17-0, brand: Johnson, KJ-30 konjac gum) in a mass ratio of 1:2.5; the smoke generating agent is a combination of ethylene glycol and sorbitol in a mass ratio of 4:1;

[0058] Step 2: The tobacco leaves are subjected to a three-stage crushing process, wherein the first stage crushing controls the material size to be less than 20 mm, the second stage crushing controls the material size to be less than 3 mm, and the third stage crushing controls the material size to be between 0.125 mm and 0.25 mm; finally, tobacco powder with a particle size between 0.125 mm and 0.25 mm is obtained and stored in a container for later use;

[0059] Step 3: adding raw fiber and water into a pulper at 45° C. for pulping at a pulping concentration of 4 wt % to obtain pulped fiber slurry;

[0060] Step 4: The crushed fiber slurry is passed through a pulping machine at 47°C for cyclic refining and defibration to obtain a fiber slurry with a beating degree of 80°SR and an average fiber length of 1 mm;

[0061] Step 5: Add water to the fiber slurry after beating, mix at 120 rpm for 1 hour, and store for later use;

[0062] Step 6: Prepare adhesive and smoke agent and store them separately for future use;

[0063] Step 7: Add the spare materials of steps 2, 5, and 6 into a mixing tank and mix them homogenously. During the process of adding the materials, the stirring paddle of the mixing tank rotates at 80 rpm. After the materials are added, the circulating homogenization system of the mixing tank is started to circulate and homogenize the slurry in the mixing tank. The circulation speed reaches 10 minutes to circulate all the slurries 5 times, and the homogenization treatment is carried out for 30 minutes. A slurry with a solid content of 20 wt% is prepared to obtain a mixed slurry.

[0064] Step 8: The mixed slurry is transported to a buffer tank, which is used to further mix the materials mixed in different batches of the mixing tank to eliminate the batching error between batches; the volume of the buffer tank is three times that of the mixing tank to accommodate the materials mixed in the three batches of the mixing tank; the buffer tank is provided with a stirring paddle and a circulating homogenization bypass, the stirring paddle speed is 70rpm, and the circulation speed reaches 10min. All the slurries circulate 4 times, so as to achieve rapid and uniform mixing of the slurry in the tank, and the homogenization treatment takes 30 minutes;

[0065] The liquid in the buffer tank is then transported to the finished product tank, which is evacuated to a vacuum degree of -0.099 MPa. The vacuum is maintained for 10 minutes and then released for defoaming to obtain the slurry product for reconstituted tobacco leaves.

[0066] Finished product 2:

[0067] A pulping process for reconstituted tobacco leaves, the preparation steps are as follows:

[0068] Step 1: Weigh the raw materials according to the following mass percentages:

[0069]

[0070] The raw material fiber is larch wood pulp fiber of coniferous wood fiber; the adhesive is a combination of chitosan (CAS No. 9012-76-4, Tianjin Guangfu Technology Development Co., Ltd., item number: gfsh204) and konjac gum (CAS No. 37220-17-0, brand: Johnson, KJ-30 konjac gum) in a mass ratio of 1:3; the smoke generating agent is a combination of ethylene glycol and sorbitol in a mass ratio of 3:1;

[0071] Step 2: The tobacco leaves are subjected to a three-stage crushing process, wherein the first stage crushing controls the material size to be less than 20 mm, the second stage crushing controls the material size to be less than 3 mm, and the third stage crushing controls the material size to be between 0.125 mm and 0.25 mm; finally, tobacco powder with a particle size between 0.125 mm and 0.25 mm is obtained and stored in a container for later use;

[0072] Step 3: adding raw fiber and water into a pulper at 40° C. for pulping, with a pulping concentration of 3 wt %, to obtain pulped fiber slurry;

[0073] Step 4: The crushed fiber slurry is passed through a pulping machine at 50°C for cyclic refining and defibration to obtain a fiber slurry with a beating degree of 85°SR and an average fiber length of 1.2 mm;

[0074] Step 5: Add water to the fiber slurry after beating, mix at 100 rpm for 1.2 hours, and store for later use;

[0075] Step 6: Prepare adhesive, smoke agent, calcium carbonate, and flavoring, and store them separately for later use;

[0076] Step 7: Add the spare materials of steps 2, 5, and 6 into a mixing tank and mix them homogenously. During the process of adding the materials, the stirring paddle of the mixing tank rotates at 100 rpm. After the materials are added, the circulating homogenization system of the mixing tank is started to circulate and homogenize the slurry in the mixing tank. The circulation speed reaches 10 minutes to circulate all the slurries 4 times, and the homogenization process is carried out for 32 minutes. A slurry with a solid content of 22 wt% is prepared to obtain a mixed slurry.

[0077] Step 8: The mixed slurry is transported to a buffer tank, which is used to further mix the materials mixed in different batches of the mixing tank to eliminate the batching error between batches; the volume of the buffer tank is 4 times that of the mixing tank to accommodate the materials mixed in 4 batches of the mixing tank; the buffer tank is provided with a stirring paddle and a circulating homogenization bypass, the stirring paddle speed is 80rpm, and the circulation speed reaches 10min. All slurries circulate 4 times, realizing rapid and uniform mixing of the slurry in the tank, and the homogenization treatment takes 32 minutes;

[0078] The liquid in the buffer tank is then transported to the finished product tank, and the finished product tank is evacuated to a vacuum degree of -0.099 MPa. The vacuum is maintained for 12 minutes and then released for defoaming to obtain the slurry product for reconstituted tobacco leaves.

[0079] Finished slurry product 3: The difference from finished slurry product 1 is that the particle size range of tobacco powder is between 40 mesh and 60 mesh, and the others are the same.

[0080] Finished slurry product 4: The difference from finished slurry product 1 is that the particle size range of tobacco powder is between 160 mesh and 270 mesh, and the others are the same.

[0081] Finished slurry product 5: The difference from finished slurry product 1 is that the beating degree in step 4 is 50°, and the others are the same.

[0082] Finished slurry product 6: The difference from finished slurry product 1 is that the beating degree in step 4 is 95°, and the others are the same.

[0083] Finished slurry product 7: The difference from finished slurry product 2 is that the particle size range of tobacco powder is between 40 mesh and 60 mesh, and the others are the same.

[0084] Finished slurry product 8: The difference from finished slurry product 2 is that the particle size range of tobacco powder is between 160 mesh and 270 mesh, and the others are the same.

[0085] Finished slurry product 9: The difference from finished slurry product 2 is that the beating degree in step 4 is 50°, and the rest are the same.

[0086] Finished slurry product 10: The difference from finished slurry product 2 is that the beating degree in step 4 is 95°, and the others are the same.

[0087] Finished slurry product 11: The difference from finished slurry product 1 is that the adhesive is chitosan (CAS No. 9012-76-4, Tianjin Guangfu Technology Development Co., Ltd., item number: gfsh204), and the rest are the same.

[0088] Finished product 12: The difference from finished product 1 is that the adhesive is konjac gum (CAS No. 37220-17-0, brand: Johnson, KJ-30 konjac gum), and the rest are the same.

[0089] Finished slurry product 13: The difference from finished slurry product 1 is that the adhesive is chitosan (CAS No. 9012-76-4, Tianjin Guangfu Technology Development Co., Ltd., article number: gfsh204) and konjac gum (CAS No. 37220-17-0, brand: Johnson, KJ-30 konjac gum) in a mass ratio of 1:0.8, and the rest are the same.

[0090] Finished slurry product 14: The difference from finished slurry product 1 is that the adhesive is chitosan (CAS No. 9012-76-4, Tianjin Guangfu Technology Development Co., Ltd., article number: gfsh204) and konjac gum (CAS No. 37220-17-0, brand: Johnson, KJ-30 konjac gum) in a mass ratio of 1:5, and the rest are the same.

[0091] Finished slurry product 15: The difference from finished slurry product 1 is that the smoke generating agent is a combination of ethylene glycol and sorbitol in a mass ratio of 1:1, and the other parts are the same.

[0092] Finished slurry product 16: The difference from finished slurry product 1 is that the smoke generating agent is a combination of ethylene glycol and sorbitol in a mass ratio of 7:1, and the other parts are the same.

[0093] 2. Performance Test

[0094] 1. Fluidity test of finished slurry

[0095] Add the above-mentioned slurry products to the slurry distributor and flow the slurry on the steel belt. Set the slurry flow height to 0.8mm and observe the distribution of the slurry on the steel belt. The test results are shown in Table 1.

[0096] Table 1: Fluidity test of finished slurry

[0097]

[0098]

[0099] 2. Appearance test of thin film

[0100] The slurry on the steel strip is dried to obtain a thin sheet, which is then peeled off from the steel strip surface and the appearance of the thin sheet is tested. The test results are shown in Table 2.

[0101]

[0102]

[0103] 3. Thin film parameter test

[0104] The thin sheets obtained from the above-mentioned slurry products were subjected to parameter tests, and the test indicators included gram weight, average thickness, thickness deviation, average apparent density, and tensile strength, which were tested and calculated.

[0105] Among them, the detection method of gram weight is: put the thin sheet into the standard quantitative sampler, take a 100cm 2 Place a standard circular sample on a high-precision electronic balance and multiply the measured weight by 100 to get the gram weight (quantitative) of the sheet in g / ㎡.

[0106] The thickness is tested by a microcomputer thickness tester. The test method is: after measuring the gram weight (quantity), the circular sample is tested by a microcomputer thickness tester at four quadrants and five positions of the center of the circle, and the average thickness value (unit: mm), thickness deviation value (unit: mm) and average apparent density value (g / cm 3 ).

[0107] The tensile strength test is completed by a special tensile sampler and a microcomputer tensile strength tester. The specific test steps are as follows:

[0108] A. Take a thin slice and put it into a special tensile sampler. The length of the sampled slice should be 200 mm and the width should be 20 mm. The length direction must be the slurry flow direction. Take 5 samples in total.

[0109] B. Microcomputer tensile strength tester parameter settings: input sample weight (quantitative), sample width 20mm, and test distance 100mm (industry default).

[0110] C. Load the sample obtained by the sampler into the upper and lower clamping frames of the microcomputer tensile strength tester, making sure that the sample is vertical and firmly clamped.

[0111] D. Click Test on the test page, and the instrument will automatically test and reset according to the parameters.

[0112] E. Take out the broken sample from the last test and repeat steps C and D. Obtain 5 test data, print out the data statistically, and obtain the tensile strength N / m.

[0113] The specific parameters of each slice test are shown in Table 3.

[0114] Table 3: Thin film parameter test

[0115]

[0116]

[0117] The test results in Tables 1-3 above show that the slurry of the present invention has good dispersion effect, high production efficiency and product quality of the slices. The slurry obtained by the method of the present invention has a smooth and uniform surface, without granularity, fiber agglomeration and overflow defects; the slices prepared by the slurry obtained by the process of the present invention have uniform powder distribution on the surface, smooth peeling surface, no holes and cracks, and moderate thickness of the slices, small thickness deviation, low apparent density, high bulk and high tensile strength.

[0118] The test results in Table 3 show that the thickness deviation of the slices obtained from the slurry products 3, 5, 7, and 9 is large, and the tensile strength is insufficient; the average apparent density of the slices obtained from the slurry products 4, 6, 8, and 10 is too large, the bulk is insufficient, and the quality is low; This indicates that the slurry products obtained by selecting the tobacco powder with a particle size between 0.125 mm and 0.25 mm and a fiber slurry with a beating degree of 60-90° SR are better, so that the thickness deviation of the slices is low, the apparent density is low, the bulk is high, and the tensile strength is high, giving the tobacco slices a better use effect.

[0119] From the test results of the slurry products 1-2 and 11-16 in Table 3, it can be seen that the combination of chitosan and konjac gum can promote the improvement of the tensile strength of the slices and give the slices better mechanical properties; especially when the ratio of the two is 1:2-3, the tensile strength of the slices is the highest.

[0120] By comparing the slurry products 1, 15-16 in Table 3, it can be seen that the present invention uses ethylene glycol and sorbitol in a mass ratio of 3-5:1 to obtain a better effect of the slices.

[0121] Those skilled in the art may make various changes and modifications to the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. The application of chitosan and konjac gum in a mass ratio of 1:2-3 as an adhesive in improving the tensile strength of heated cigarette tobacco reconstituted tobacco leaf slices is characterized in that, The heated cigarette tobacco reconstituted tobacco leaf sheet comprises a slurry finished product sent to a slurry dryer for slurry drying; The preparation steps of the slurry preparation product are as follows: Step 1: Weigh the raw materials according to the following mass percentages: Tobacco powder 65-80%; Raw material fiber 3-10%; Adhesive 2-5%; Smoke agent 12-20%; The total of the above components is 100%; Step 2: The tobacco leaves are subjected to at least three-stage crushing processes to obtain tobacco powder, which is stored in a container for later use; Step 3: adding raw fiber and water into a pulper for crushing at a concentration of 3%-6% to obtain crushed fiber slurry; Step 4: The crushed fiber slurry is circulated through a refiner for refining and defibration to obtain a fiber slurry with a beating degree of 60-90°SR; Step 5: adjusting the concentration of the fiber slurry after beating and storing it for future use; Step 6: Prepare adhesive and smoke agent and store them for future use; Step 7: Put the prepared materials from steps 2, 5 and 6 into a mixing tank and mix them homogeneously to obtain a mixed slurry; Step 8: transporting the mixed slurry to a buffer tank, and then transporting it to a finished product tank, evacuating the finished product tank, maintaining the pressure, and then releasing the vacuum to defoam, thereby obtaining the slurry product for reconstituted tobacco leaves; Wherein, in step 2, tobacco powder with a particle size between 0.125 mm and 0.25 mm is obtained; In step 2, the tobacco leaves are subjected to a three-stage pulverization process; in the three-stage pulverization process, the first stage pulverization controls the material size to be less than 20 mm, the second stage pulverization controls the material size to be less than 3 mm, and the third stage pulverization controls the material size to be between 0.125 mm and 0.25 mm; The adhesive is a combination of chitosan and konjac gum in a mass ratio of 1:2-3; The smoke generating agent is a combination of ethylene glycol and sorbitol in a mass ratio of 3-5:

1.

2. The use according to claim 1, characterized in that: The raw material fiber includes at least one of wood fiber, tobacco fiber, hemp fiber, bamboo fiber, sugarcane fiber, straw fiber and cotton fiber.

3. The use according to claim 1, characterized in that: The crushing temperature is 30-60℃; and / or, the refining temperature is 30-60°C; And / or, the average length of the fibers after beating is 0.1-4 mm.

4. The use according to claim 1, characterized in that: The mixing tank is provided with at least one stirring paddle; And / or, the mixing tank is provided with a circulating homogenizing mixing bypass, and the circulating homogenizing mixing bypass is provided with a slurry delivery pump; And / or, the number of mixing tanks is at least two.

5. The use according to claim 1, characterized in that: The material sent out from the mixing tank is sent to the buffer tank, where it continues to be mixed and circulated for homogenization. The volume of the buffer tank is set to 2-5 times that of the mixing tank.

6. The use according to claim 1, characterized in that: The finished product tank is vacuumed and multiple finished product tanks are provided.

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