Consistency paste, sheet homogenizing longitudinal and transverse tensile strength differences, preparation thereof and new tobacco products produced

Abstract

The present application belongs to the field of new tobacco thick slurry sheet new material, and particularly relates to a preparation method of thick slurry beneficial to homogenizing longitudinal and transverse tensile strength difference of new tobacco sheet, wherein a binder and tobacco ash are first homogenously mixed, then an additive is added for second homogenously mixing, and then third grinding is carried out, so that the thick slurry is obtained; the additive comprises at least one of propylene diamine, triethylamine, polyethylene glycol and boric acid. The present application also comprises the thick slurry, sheet and new tobacco product prepared by the preparation method. The process can solve the problem of too large longitudinal and transverse tensile strength difference of thick slurry sheet, and can improve the qualified rate of the sheet.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of new tobacco, and particularly relates to the technical field of new tobacco thick paste and sheet. BACKGROUND

[0002] Tobacco sheet is a kind of reorganization process used in the 1950s-1960s to solve the reuse of waste in the tobacco processing process. However, with the increasing concern about the health of cigarettes, tobacco sheet has begun to play an important role. Because its chemical composition and burning performance are more easily adjusted than traditional tobacco leaves, people have given it the function of reducing tar and harm, and have used it as a functional carrier or improved the burning state of the cigarette, and adjusted the main material of the chemical composition of smoke. Today, with the rise of new tobacco such as heated cigarettes, people use it as the main smoke material for heated cigarettes, and the functionality of tobacco sheet is more widely used. The methods for manufacturing tobacco sheet mainly include thick paste method, roller pressing method, papermaking method and modified papermaking method (dry method). At present, 80% of heated cigarettes use thick paste or roller pressing sheet as the smoke material. When the above two methods produce the sheet, the soot and the adhesive are mixed to form a thick paste to produce the sheet. However, the sheet produced by the traditional thick paste method or the roller pressing method process only uses one mixing process, and the soot and the adhesive are not uniformly mixed, the particles are of different sizes, and the sheet often has quality problems such as noodle-like, many cavities, and ulcer-like during forming. The longitudinal and transverse tensile strengths of the sheet are greatly different, and the transverse tensile strength of the general sheet is more than twice the longitudinal tensile strength, which is not conducive to the application of the sheet in cigarettes.

[0003] For example, the Chinese patent document with publication number CN115553487A discloses a heated cigarette sheet and a manufacturing method thereof. The heated cigarette sheet includes water, an adhesive, a smoke agent, tobacco powder, wood pulp, tea fruit paste and animal fat. The tea fruit paste includes tannin and tea saponin, and the animal fat includes glyceride. By adding tea fruit paste and animal fat in the sheet raw material, the synergistic effect between cellulose, tannin, tea saponin and glyceride effectively improves the moisture absorption problem of the sheet and increases the tensile strength of the sheet. For another example, the Chinese patent document with publication number CN109349677B discloses an ultra-fine tobacco powder reconstituted tobacco leaf and a preparation method thereof. The preparation method includes the steps of external fiber shearing, thick paste liquid preparation and reconstituted tobacco leaf forming.

[0004] Although the existing technology can improve the tensile strength to a certain extent, it mainly involves the improvement of the longitudinal tensile strength, and there are few related researches on reducing the difference between the longitudinal and transverse tensile strengths under the premise of improving the tensile strength. SUMMARY

[0005] In view of the problem of the difference between the longitudinal and transverse tensile strengths of the existing thick pulp method sheet, the first object of the present application is to provide a preparation method for preparing thick pulp which is beneficial to the homogenization of the difference between the longitudinal and transverse tensile strengths of the thick pulp method sheet.

[0006] The second object of the present application is to provide a sheet with homogenized difference between the longitudinal and transverse tensile strengths of the thick pulp method sheet and a new type of tobacco product (such as a heated cigarette) prepared by using the thick pulp.

[0007] The thick pulp method sheet is obtained by self-flowing pulp distribution and drying of thick pulp. Since the skeleton for increasing the tensile strength is the fiber after defibration, in the self-flowing forming state, the fibers in the thick pulp will exhibit a "needle tip effect" along the direction of motion of the steel belt, resulting in a much larger number of fiber arrangement along the direction of the steel belt (longitudinal direction) than perpendicular to the steel belt (transverse direction), which is the main reason for the difference between the longitudinal and transverse tensile strengths of the thick pulp method sheet. In view of this problem, the present application provides the following solutions:

[0008] A preparation method of thick pulp which is beneficial to the homogenization of the difference between the longitudinal and transverse tensile strengths of the new type of tobacco thick pulp method sheet, the adhesive and the fly ash are first homogenously mixed, then the auxiliary agent is added for the second homogenously mixed, and then the third grinding is carried out, so as to obtain the thick pulp.

[0009] The auxiliary agent includes at least one of propylene diamine, triethylamine, polyethylene glycol and boric acid. 。

[0010] The present application provides a solid-liquid mixing-grinding preparation idea, which innovatively mixes the adhesive liquid material and the solid material such as fly ash in the first stage, then performs the second stage of homogenously mixing under the assistance of the auxiliary agent, and then cooperates with the subsequent grinding treatment, so as to be beneficial to the regulation of the occurrence of the fiber, promote the interweaving and crosslinking of the fiber, and then improve the longitudinal and transverse tensile strengths. Furthermore, it can also reduce the difference between the longitudinal and transverse tensile strengths of the tobacco sheet.

[0011] In the present application, the adhesive can be a conventional thick pulp method adhesive component in the industry, for example, it includes xanthan gum, tamarind gum, carrageenan gum, guar gum, konjac gum, modified starch, oxidized starch, etherified starch and other plant gums or starch derivatives; CMC, sodium alginate and the like.

[0012] The fly ash at least includes at least one of tobacco leaf raw materials (such as tobacco shreds), tobacco stems, expanded tobacco shreds, expanded stem shreds, tea leaves, plant roots, stems, leaves, flowers, fruits and plant fibers.

[0013] Preferably, the fly ash also allows to contain at least one of stem signs, papermaking method sheet shreds, tea leaves and plant fibers.

[0014] Preferably, the weight ratio of the soot to the binder is 1:3-10, and further can be 1:4-6.

[0015] In the present application, the starting system of the first stage of homogeneous mixing is allowed to add an atomizing agent, which can be at least one of ethylene glycol and glycerol.

[0016] Preferably, the amount of the atomizing agent relative to the soot is less than or equal to 20 Wt%.

[0017] In the present application, the starting system of the first stage of homogeneous mixing is allowed to add an additional fiber, which can be a commercial product or obtained by defibration based on existing means.

[0018] In the present application, the first stage of homogeneous mixing is preferably carried out in an improved homogenizing tank, which comprises a tank body (1), a motor (2) provided at the top of the tank body (1), an output end of the motor (2) fixedly connected with a stirring shaft (3) extending into the inside of the tank body (1), the stirring shaft (3) fixedly connected with a stirring frame (4), the stirring frame (4) fixedly installed with spiral stirring blades (5) inside, a stirring scraper (6) fixedly installed outside the stirring frame (4), the stirring scraper (6) in contact with the inner side wall of the tank body (1), a stirring tooth disc (7) fixedly installed at the bottom end of the stirring shaft (3), and a heat preservation jacket (8) provided outside the tank body (1). In the present application, the first stage of homogeneous mixing is carried out in the homogenizing tank, which can be combined with other processes such as additives, to further improve the occurrence of the fiber and the homogenization effect.

[0019] As a preferred, in the homogenizing tank, the stirring tooth disc (7) comprises an upper stirring disc (701) and a lower stirring disc (702), and the lower stirring disc (702) is in contact with the bottom of the tank body (1).

[0020] Preferably, the upper stirring disc (701) and the lower stirring disc (702) are both provided with tooth pieces (703) alternately arranged upward and downward around the periphery.

[0021] Preferably, the homogenizing tank further comprises a main controller and a weight sensor, the weight sensor is electrically connected with the main controller, and the weight sensor is arranged at the lower end of the supporting leg of the bottom of the tank body for weighing the whole tank body.

[0022] Preferably, the bottom of the tank body (1) is in contact with the stirring scraper (6).

[0023] Preferably, the heat preservation jacket (8) is provided with a hot water flow channel (801), the heat preservation jacket (8) has a hot water inlet (802) and a hot water outlet (803) in communication with the hot water flow channel (801), and the bottom of the heat preservation jacket (8) is provided with a blowdown port (804).

[0024] Preferably, a crossbeam (11) is connected between the stirring frame (4) and the stirring shaft (3), and the crossbeam (11) has an included angle of 45°-90° with the horizontal plane.

[0025] Preferably, the heat-insulating jacket (8) is provided with a jacket temperature probe (9), and the tank body (1) is provided with a pot temperature probe (10).

[0026] Preferably, the tank body (1) is provided with a feed inlet (101) at the top and a discharge outlet (102) at the bottom.

[0027] Preferably, the tank body (1) is provided with a top cover (103), and the cover closing part of the top cover (103) is provided with a sealing rubber ring (104).

[0028] Preferably, the rotating speed of the first-stage homogenizing mixing stage is 500-2000 r / min, and the time is more than 5 min, preferably 5-25 min.

[0029] Preferably, the auxiliary agent is a combination of triethylamine and boric acid, and the weight ratio of the two is preferably 1-3:1. It is found that the combination of the preferred auxiliary agent and the process of the present application can further improve the longitudinal and transverse tensile strength and homogenization effect.

[0030] Preferably, the auxiliary agent is 0.1-20 wt.% of the weight of soot, and further can be 0.5-3 wt.%.

[0031] In the present application, the second-stage homogenizing mixing can be carried out in a vertical or horizontal high-speed mixing tank. For example, the vertical or horizontal high-speed mixing tank is provided with a screen on the basis of a conventional high-speed mixing device.

[0032] Preferably, the rotating speed of the second-stage homogenizing mixing is 2000-6000 r / min, and the time is 20-60 min, and further is 30-50 min.

[0033] For example, the third-stage grinding process preferably adopts a JMF-180 vertical colloidal mill, and the flow rate is 8000 L / h (water) and 1500 L / h (solid content 25% thick slurry) for continuous discharge. The target particle size after grinding is ≤30 μm.

[0034] The rotating speed of the grinding disc of the third-stage grinding is 3000-6000 r / min.

[0035] In the present application, the time of the third-stage grinding can be adjusted as needed. Considering the processing effect and the convenience of the process, the time of the colloidal mill can be less than 10 min, and preferably is 0.5-5 min.

[0036] The application further provides a preparation method of the thick pulp sheet with homogenized longitudinal and transverse tensile strength difference.

[0037] In the application, the thick pulp prepared by the innovative method can improve the distribution of fibers in the pulp distribution process, facilitate the disordered interweaving of fibers, and break the fiber needle tip effect in the self-flowing process of the thick pulp, thereby homogenizing the longitudinal and transverse tensile strength difference of the thick pulp sheet and improving the performance of the sheet.

[0038] In a preferred scheme of the application, the pulp distribution process is performed under the assistance of an electromagnetic field.

[0039] In the application, an electromagnetic field is added in the transverse direction of the coated pulp in the pulp distribution process, so that the pulp distribution is performed under the assistance of the electromagnetic field.

[0040] In the application, the intensity of the electromagnetic field is less than or equal to 10T, and is preferably 1-6T.

[0041] The temperature in the drying stage is not particularly required, and can meet the drying requirement of the thick pulp, for example, can be 90-150℃.

[0042] The application further provides the thick pulp sheet with homogenized longitudinal and transverse tensile strength difference prepared by the preparation method.

[0043] A novel tobacco product comprises the thick pulp sheet with homogenized longitudinal and transverse tensile strength difference prepared by the preparation method.

[0044] The application further provides a heated cigarette, wherein the heating section comprises the thick pulp sheet with homogenized longitudinal and transverse tensile strength difference prepared by the preparation method.

[0045] Advantages

[0046] 1. The application innovatively mixes the adhesive and the ash in the first homogenization mixing, and then mixes them again in the second homogenization mixing with the assistance of the auxiliary agent.

[0047] 2、The application further improves the longitudinal and transverse tensile strength and narrows the difference of longitudinal and transverse tensile strength of the thick pulp sheet prepared by cooperating with the first homogenization mixing of the homogenization tank.

[0048] 3、The application is beneficial to the distribution of the thick pulp and can obtain the thick pulp sheet with low longitudinal and transverse tensile difference. On the basis of the innovation, further cooperating with the control of the auxiliary component and / or the distribution of the thick pulp under the assistance of the electromagnetic field can further improve the longitudinal and transverse tensile strength and the difference of the longitudinal and transverse tensile strength, and can also improve the release uniformity of the atomizing agent and other components. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is the structure schematic diagram of the homogenization tank of the first homogenization mixing;

[0050] Figure 2 is the structure schematic diagram of the homogenization tank of the first homogenization mixing; Figure 1 is the top view of the homogenization tank of the first homogenization mixing.

[0051] The reference signs in the drawings: 1, tank body; 101, feeding port; 102, discharging port; 103, top cover; 104, sealing rubber ring; 2, motor; 3, stirring shaft; 4, stirring frame; 5, spiral stirring blade; 6, stirring scraper; 7, stirring tooth disc; 701, upper stirring disc; 702, lower stirring disc; 703, tooth piece; 8, heat preservation jacket; 801, hot water flow channel; 802, hot water inlet; 803, hot water outlet; 804, blowdown port; 9, jacket temperature probe; 10, in-kettle temperature probe; 11, cross beam. DETAILED DESCRIPTION

[0052] The application can be further clearly understood through the specific embodiments of the application given below. However, they are not the limitation of the application.

[0053] In the following cases, the adhesive and the fly ash can adopt the components with adhesive function commonly used in the industry. In the following cases, the adhesive refers to one or combination of xanthan gum, tamarind gum, carrageenan, guar gum, konjac gum, modified starch, oxidized starch, etherified starch and other plant gums or starch derivatives, and CMC, sodium alginate and the like (the fly ash refers to at least one of tobacco leaf, tobacco stem, expanded tobacco, expanded stem, tea leaf, plant flower, leaf, plant fiber;

[0054] In addition, the fly ash can also contain at least one of stem, papermaking sheet silk, tea leaf and plant fiber;

[0055] In the present application, the first homogenization mixing process can adopt the conventional mixing process equipment in the industry, and in the present application, a modified homogenization tank is preferably adopted. The structural diagram is shown in Figure 1 and Figure 2 ,

[0056] As shown in Figure 1 and Figure 2 , the homogenization tank comprises a tank body 1, the top of the tank body 1 is provided with a motor 2, the output end of the motor 2 is fixedly connected with a stirring shaft 3 extending into the inside of the tank body 1, the stirring shaft 3 is fixedly connected with a stirring frame 4, the stirring frame 4 is fixedly installed with a spiral stirring blade 5, a stirring scraper 6 is fixedly installed outside the stirring frame 4, the stirring scraper 6 is in contact with the inner side wall of the tank body 1, the bottom end of the stirring shaft 3 is fixedly installed with a stirring tooth disc 7, and the outside of the tank body 1 is provided with a heat preservation jacket 8. The stirring frame 4 and the stirring shaft 3 are connected with a crossbeam 11, the crossbeam plays a connecting role for the stirring frame, and the crossbeam 11 has an included angle of 45°-90° with the horizontal plane. When the material such as ash is added into the tank body 1 from the feeding port 101, the inclined crossbeam can facilitate the sliding of the material, reduce the adhesion of the material on the crossbeam, make the material fall into the tank as much as possible for stirring, and improve the accuracy of the material mixing. In other embodiments, the crossbeam can also use a crossbeam with a circular cross section to reduce the adhesion of the material.

[0057] As shown in Figure 1 , the stirring tooth disc 7 comprises an upper stirring disc 701 and a lower stirring disc 702, and the lower stirring tooth piece 703 is in contact with the bottom of the tank body 1. The upper stirring disc 701 and the lower stirring disc 702 are both provided with tooth pieces 703 arranged alternately upward and downward around the periphery. Specifically, the stirring disc can stir the slurry at the bottom of the tank, and through the action of the alternately arranged tooth pieces 703 and the upper stirring disc 701 and the lower stirring disc 702, the vortex speed of the slurry during rotation can be increased, so that the stirring is more uniform.

[0058] As shown in Figure 1 , the stirring scraper 6 is provided with a plurality of stirring scrapers 6, the height of each stirring scraper 6 stacked in the vertical direction covers the height of the side wall of the tank body 1, and the bottom of the tank body 1 also contacts the stirring scraper 6. Specifically, the use of the scraper can make the slurry adhering to the inner wall of the tank body 1 fall off, so that the ash and the viscous glue are mixed uniformly, and the bottom can also be stirred to improve the uniformity of the mixing.

[0059] In the preferred embodiment, a main controller and a weight sensor are further included, the weight sensor is electrically connected with the main controller, the weight sensor is arranged at the lower end of the supporting leg of the tank body for weighing the whole tank body. The weight signal is transmitted to the main controller, the main controller calculates the ratio of the adhesive and the fly ash based on the weight of the adhesive, and the fly ash is added in proportion, but when the fly ash is added too much, the adhesive is supplemented, and then the quantitative circulation of the added fly ash is carried out, which can effectively improve the accuracy of the mixing ratio.

[0060] As shown in Figure 1 The heat preservation jacket 8 is provided with a hot water flow channel 801, the heat preservation jacket 8 is provided with a hot water inlet 802 and a hot water outlet 803 which are in communication with the hot water flow channel 801, the heat preservation jacket 8 is provided with a pollution discharge port 804 at the bottom, the heat preservation jacket 8 is provided with a jacket temperature probe 9, and the tank body 1 is provided with a pot temperature probe 10. The heat preservation jacket 8 is preserved by circulating hot water, and the hot water can be heated by an electric heater. The hot water can be supplied by reducing the complex structure of the steam pipeline and the condensate pipeline connected on the equipment installation site, and is convenient to use.

[0061] As shown in Figure 1 The tank body 1 is provided with a feed inlet 101 at the top, and is provided with a discharge outlet 102 at the bottom, the tank body 1 is provided with a top cover 103, and the cover closing part of the top cover 103 is provided with a sealing rubber ring 104. Specifically, the tank body 1 adopts a semi-open cover type, and the top cover 103 can be opened for high-pressure water gun washing during cleaning. The sealing rubber ring 104 is arranged at the cover closing part of the top cover 103, which can prevent the liquid in the tank from overflowing.

[0062] The operation principle of the homogenizing tank of the embodiment is as follows: the motor is started to rotate the stirring shaft, the stirring shaft drives the stirring frame to rotate, the spiral stirring blade, the stirring scraper and the stirring toothed disc installed on the stirring frame rotate together to stir the thick slurry in the tank body, so that the fly ash and the adhesive and other additive components are uniformly mixed. Hot water of a certain temperature is passed in the hot water flow channel to control the temperature of the tank body, and the temperature in the heat preservation jacket and the tank body can be detected by the jacket temperature probe and the pot temperature probe respectively.

[0063] In summary, the homogenizing tank of the embodiment, the stirring shaft is fixedly connected with the stirring frame, the spiral stirring blade is fixedly installed in the stirring frame, the spiral stirring blade can fully stir and mix the thick slurry in the middle of the tank body. The stirring scraper is fixedly installed outside the stirring frame, the stirring scraper is in contact with the inner side wall of the tank body, the stirring scraper can hang down the viscous glue adhered to the side wall of the tank body, fully mix, and improve the mixing uniformity. The stirring teeth disc is fixedly installed at the bottom end of the stirring shaft, the stirring teeth disc can stir the thick slurry at the bottom of the tank body, increase the vortex speed of the slurry, and mix more uniformly. The tank body is provided with a heat preservation jacket outside, the temperature in the mixing process can be controlled, and the quality of the final product tobacco is improved.

[0064] If the above disclosure or relates to the mutually fixed connection of parts or structural members, except otherwise stated, the fixed connection can be understood as: detachable fixed connection (for example, connected by using bolts or screws), and can also be understood as: non-detachable fixed connection (for example, riveting, welding), of course, the mutual fixed connection can also be replaced by an integral structure (for example, integrally formed by using casting process) (except for obvious cases that cannot use integral forming process).

[0065] The starting thick slurry in the application can be obtained based on known methods, for example, it can be obtained by mixing conventional adhesives and tobacco ash. As a typical example: 15 kg of cane fiber and 450 kg of water are placed in a high-speed hydraulic defibrator and defibrated for 70 minutes, and the stirring speed is 5000 rpm. 3 kg of guar gum, 0.5 kg of xanthan gum, 32 kg of 10% PEG solution, and 5 kg of glycerol are sequentially added to the liquid in the above-mentioned hydraulic defibrator, and continue to stir at a speed of 5000 rpm for 30 minutes (adhesive). At the same time, 60 kg of tobacco leaves, 30 kg of tobacco stems, and 10 kg of tea leaves are dry ground into 300 mesh tobacco ash for standby (tobacco ash).

[0066] In the application, the second-stage homogenizing mixing is carried out in a vertical or horizontal high-speed mixing tank, which can be a conventional one that can meet the requirement of 2000-6000 r / min speed, and is preferably a known mixing device provided with a screen, for example, the high-speed mixer of TMCI company can be used in the following cases.

[0067] In the application, the third-stage grinding device is an online pipeline type grinding and dispersing machine, and is preferably a JMF-180 vertical colloidal mill.

[0068] In the application, the thick slurry prepared by the application can be formed into a sheet based on conventional means, and on the basis of existing conventional means, an improved magnetic auxiliary process can also be used for strengthening.

[0069] The method for testing the tensile strength in the longitudinal and transverse directions is to follow the method in "Reconstituted Tobacco" (YG / T 16-2014). In the present application, the properties of each group of the sheet, such as the thickness and the moisture content, are the same, but reasonable fluctuations that are operationally tolerated and do not interfere with the tensile strength test results are allowed (for example, the thickness is allowed to have a tolerated difference of ±0.01 mm, and the moisture content is allowed to have a tolerated difference of ±0.1%).

[0070] Example 1

[0071] Step (1): First-stage mixing:

[0072] The prepared binder 500 kg and the prepared soot 100 kg are respectively input into a homogenizing tank through an accurate metering system according to the batch formula requirements, and then mixed at a speed of 1000 revolutions per minute for 15 minutes (marked as t1) to obtain a first-stage slurry. Figure 1

[0073] Step (2): Second-stage homogenizing mixing:

[0074] Then, the auxiliary agent (triethylamine, which is 2% of the weight of the soot) is added, and the mixed slurry is discharged through a 150-mesh screen after high-speed mixing at a speed of 4000 revolutions per minute for 40 minutes (marked as t2) to obtain a second-stage slurry.

[0075] Step (3): Third-stage mixing:

[0076] The second-stage slurry obtained in step (2) is continuously fed into a grinding device at a constant flow rate of 1000 kg / hour to perform thick slurry grinding (third-stage mixing at a speed of 4000 revolutions per minute) for 1 minute (marked as t3) to obtain the thick slurry (modified thick slurry).

[0077] Step (4):

[0078] The thick slurry obtained in step (3) is subjected to cloth spreading, drying (at a temperature of 98℃±3), and peeling to form a sheet.

[0079] The thick slurry treated by this method forms a complete and full sheet on the steel belt without quality problems such as noodle-like shape, hollow, and ulceration, the thickness of the sheet is 0.18 mm, the moisture content of the sheet is 11.5%, the tensile strength in the transverse direction of the sheet is 419 N / mm 2 , the tensile strength in the longitudinal direction is 482 N / mm 2 , the ratio of the tensile strengths in the longitudinal and transverse directions is 1.15, and the qualified rate of the product quality is 100%.

[0080] Example 2

[0081] ​The difference between Example 1 and Example 2 is that the composition of the auxiliary agent is changed in Step 2. The experimental groups are as follows:

[0082] A: The auxiliary agent is boric acid, and the addition amount is 2.5wt% of the weight of the soot;

[0083] B: The auxiliary agent is a mixture of triethylamine and boric acid in a ratio of 2:1, and the total weight of the auxiliary agent is 1.5wt% of the weight of the soot.

[0084] The method of Example 1 is used to prepare the sheet and test it, and the results are as follows:

[0085] A: The thick slurry treated by this method forms a complete sheet on the steel belt, and the entire sheet has no quality problems such as noodles, cavities, and collapse. The transverse tensile strength of the sheet is 396N / mm 2 , the longitudinal tensile strength is 479N / mm 2 , the ratio of transverse and longitudinal tensile strengths is 1.21, and the product quality pass rate is 100%.

[0086] B: The thick slurry treated by this method forms a complete sheet on the steel belt, and the entire sheet has no quality problems such as noodles, cavities, and collapse. The transverse tensile strength of the sheet is 485N / mm 2 , the longitudinal tensile strength is 534N / mm 2 , the ratio of transverse and longitudinal tensile strengths is 1.10, and the product quality pass rate is 100%.

[0087] From Examples 1 and 2, it can be seen that the use of the auxiliary agent and the innovative combination of the grinding equipment can synergistically improve the longitudinal and transverse uniformity of the sheet. In particular, the use of a combination of triethylamine and boric acid as the auxiliary agent can unexpectedly exhibit a more synergistic effect at a lower addition amount, which can synergistically improve the longitudinal and transverse strength and unexpectedly further improve the longitudinal and transverse uniformity.

[0088] Example 3

[0089] The difference between Example 1 and Example 3 is that the slurry distribution process is assisted by a 5T electromagnetic field (the magnetic field is set horizontally, i.e. the direction of the magnetic field is perpendicular to the direction of the sheet transport) in Step 4. The other operations and parameters are the same as in Example 1, and the method of Example 1 is used for testing, and the results are as follows:

[0090] The thick slurry treated by this method forms a complete sheet on the steel belt, and the entire sheet has no quality problems such as noodles, cavities, and collapse. The transverse tensile strength of the sheet is 524N / mm 2 , the longitudinal tensile strength is 556N / mm 2 , the ratio of transverse and longitudinal tensile strengths is 1.06, and the product quality pass rate is 100%. The assistance of the magnetic field not only improves the longitudinal and transverse tensile strength, but also unexpectedly further improves the longitudinal and transverse uniformity.

[0091] Example 4

[0092] Compared with Example 2B, the only difference is that in step 4, the slurry application process is carried out under the assistance of a 4T electromagnetic field (the magnetic field is set horizontally, that is, the direction of the magnetic field is perpendicular to the direction of sheet conveying). Other operations and parameters are the same as in Example 2, and the test is conducted according to the method of Example 1. The results are as follows:

[0093] The slurry treated in this way forms a complete sheet on the steel strip, and the entire sheet is free of quality problems such as noodle-like structures, voids, and rot. The transverse tensile strength of the sheet is 557 N / mm². 2 Longitudinal tensile strength 569 N / mm 2 The ratio of longitudinal to transverse tensile strength is 1.02. The product quality pass rate reaches 100%.

[0094] Example 5

[0095] Compared with Example 4, the only difference is that the process in step 1 uses the same equipment as in step 2, and the other processing techniques and times are the same as in Example 1.

[0096] The slurry treated in this way forms a complete sheet on the steel strip, without any noodle-like, void, or rotten defects. The sheet thickness is 0.18 mm, the moisture content is 11.1%, and the transverse tensile strength is 240 N / mm². 2 Longitudinal tensile strength 357 N / mm 2 The ratio of longitudinal to transverse tensile strength is 1.49. The product quality pass rate reaches 100%.

[0097] Comparative Example 1 (Conventional Process)

[0098] Compared with Example 1, the only difference is that 500 kg of adhesive and 100 kg of soot are directly mixed using the process in step 2 to obtain a thick slurry. No additives are added in this process. The thick slurry is then directly processed using the process in step 4 to obtain a sheet.

[0099] The transverse tensile strength of the sheet was tested according to the method in Example 1, and the tensile strength of the sheet was 87 N / mm². 2 Longitudinal tensile strength 238 N / mm 2 The ratio of longitudinal to transverse tensile strength is 2.7. The product quality pass rate is 93%.

[0100] Comparative Example 2

[0101] Compared with Example 1, the only difference is that steps 2 and 3 are omitted, and the slurry from step 1 (t1 is 60 min) is directly processed in step 4.

[0102] The transverse tensile strength of the sheet was 127 N / mm² when tested according to the method in Example 1. 2, the tensile strength in the cross direction was 253 N / mm 2 , the tensile strength in the cross direction was 253 N / mm

[0103] Comparative Example 3

[0104] Comparative Example 3 was identical to Example 1 except that in Step 2 no auxiliary was added and the other operations and parameters were the same as in Example 1. The tensile strength in the cross direction of the sheet was 215 N / mm2, the tensile strength in the longitudinal direction was 389 N / mm2, and the ratio of the tensile strengths in the cross direction to the longitudinal direction was 1.80.

[0105] The test was carried out according to the method of Example 1. The tensile strength in the cross direction of the sheet was 253 N / mm 2 , the tensile strength in the cross direction was 253 N / mm 2 , the tensile strength in the cross direction was 253 N / mm

[0106] Comparative Example 4

[0107] Comparative Example 4 was identical to Example 1 except that Step 3 was not carried out and t2 in Step 2 was extended to 45 min, after which Step 4 was carried out directly. The tensile strength in the cross direction of the sheet was 215 N / mm2, the tensile strength in the longitudinal direction was 389 N / mm2, and the ratio of the tensile strengths in the cross direction to the longitudinal direction was 1.80.

Claims

1. A method for preparing a thick paste that facilitates homogenization of the longitudinal and transverse tensile strength differences in tobacco sheet, characterized in that, The adhesive and soot are homogenized and mixed in the first stage, then the additives are added and homogenized and mixed in the second stage, and then the mixture is ground in the third stage to obtain the thick slurry. The additive is a combination of triethylamine and boric acid, and the weight ratio of the two is 1~3:1; The weight ratio of soot to binder is 1:3~10; The additive is 0.1~20 wt.% of the weight of the fly ash. The rotation speed during the first homogenization stage is 500~2000 r / min; the time is more than 5 minutes. The second stage of homogenization mixing is performed at a speed of 2000~6000 rpm for 20~60 min. The third grinding stage takes less than 10 minutes.

2. The preparation method according to claim 1, characterized in that, The adhesive includes at least one of plant gum, starch derivative, CMC, and sodium alginate.

3. The preparation method according to claim 1, characterized in that, The ash contains at least one of the following: tobacco leaves, tobacco stems, puffed tobacco shreds, puffed stem shreds, tea leaves, plant roots, stems, leaves, flowers, fruits, and plant fibers.

4. The preparation method according to claim 3, characterized in that, The ash also contains at least one of the following: tobacco leaves, stems, papermaking sheets, tea leaves, and plant fibers.

5. The preparation method according to claim 1, characterized in that, The weight ratio of soot to adhesive is 1:3~10.

6. The preparation method according to claim 1, characterized in that, In the initial homogenized mixing system, an atomizing agent is also added.

7. The preparation method according to claim 6, characterized in that, The atomizing agent is at least one of ethylene glycol and glycerol.

8. The preparation method according to claim 6, characterized in that, The amount of the atomizing agent relative to the soot is less than or equal to 20 wt.

9. The preparation method according to claim 1, characterized in that, The first homogenization mixing process is carried out in a homogenizing tank, which includes a tank body (1). A motor (2) is provided on the top of the tank body (1). The output end of the motor (2) is fixedly connected to a stirring shaft (3) that extends into the tank body (1). A stirring frame (4) is fixedly connected to the stirring shaft (3). A spiral stirring blade (5) is fixedly installed inside the stirring frame (4). A stirring scraper (6) is fixedly installed on the outside of the stirring frame (4). The stirring scraper (6) contacts the inner wall of the tank body (1). A stirring toothed disc (7) is fixedly installed at the bottom end of the stirring shaft (3). A heat insulation jacket (8) is provided on the outside of the tank body (1).

10. The preparation method according to claim 9, characterized in that, In the homogenizing tank, the stirring toothed disc (7) includes an upper stirring disc (701) and a lower stirring disc (702), and the lower stirring disc (702) contacts the bottom of the tank body (1).

11. The preparation method according to claim 10, characterized in that, The upper stirring plate (701) and the lower stirring plate (702) are both provided with toothed plates (703) that are alternately arranged upward and downward around their perimeter.

12. The preparation method according to claim 9, characterized in that, The homogenizing tank also includes a main controller and a weight sensor. The weight sensor is electrically connected to the main controller and is located at the lower end of the support foot at the bottom of the tank for weighing the entire tank.

13. The preparation method according to claim 9, characterized in that, The bottom of the tank (1) is in contact with the stirring scraper (6).

14. The preparation method according to claim 9, characterized in that, The insulation jacket (8) is provided with a hot water flow channel (801), the insulation jacket (8) has a hot water inlet (802) and a hot water outlet (803) communicating with the hot water flow channel (801), and the bottom of the insulation jacket (8) is provided with a drain outlet (804).

15. The preparation method according to claim 9, characterized in that, A crossbeam (11) is connected between the stirring frame (4) and the stirring shaft (3), and the crossbeam (11) has an angle of 45°-90° with the horizontal plane.

16. The preparation method according to claim 9, characterized in that, The insulation jacket (8) is equipped with a jacket temperature probe (9), and the tank body (1) is equipped with an in-boiler temperature probe (10).

17. The preparation method according to claim 9, characterized in that, The tank (1) has a feed inlet (101) at the top and a discharge outlet (102) at the bottom.

18. The preparation method according to claim 9, characterized in that, The tank (1) has a top cover (103), and the top cover (103) is provided with a sealing ring (104) at the closing part.

19. The preparation method according to claim 1, characterized in that, The first homogenization mixing stage takes 5 to 25 minutes.

20. The preparation method according to claim 1, characterized in that, The additive is 0.5 to 3 wt.% of the weight of the flue ash.

21. The preparation method according to claim 1, characterized in that, The second stage of homogenization and mixing is carried out in a vertical or horizontal high-speed mixing tank.

22. The preparation method according to claim 1, characterized in that, The second stage of homogenization and mixing takes 30-50 minutes.

23. The preparation method according to claim 1, characterized in that, The equipment used for the third stage of grinding is an online pipeline grinding and dispersing machine.

24. The preparation method according to claim 23, characterized in that, The equipment used for the third stage of grinding is a JMF-180 vertical colloid mill.

25. The preparation method according to claim 1, characterized in that, The third grinding stage takes 0.5 to 5 minutes.

26. A method for preparing a paste-processed sheet with differences in longitudinal and transverse tensile strength, characterized in that, A thick slurry is obtained by any one of claims 1 to 25, and then spread, dried and peeled to form a thin sheet.

27. The preparation method according to claim 26, characterized in that, The slurry application stage is carried out with the assistance of an electromagnetic field.

28. The preparation method according to claim 27, characterized in that, During the slurry application process, an electromagnetic field is applied to the slurry in the transverse direction.

29. The preparation method according to claim 27 or 28, characterized in that, The induced intensity of the electromagnetic field is less than or equal to 10T.

30. The preparation method according to claim 29, characterized in that, The electromagnetic field induction intensity is 1~6T.

31. The preparation method according to claim 26, characterized in that, The temperature during the drying stage is 90~150℃.

32. A paste-processed sheet with longitudinal and transverse tensile strength differences, prepared by the preparation method according to any one of claims 26 to 31.

33. A novel tobacco product, characterized in that, It includes the slurry-processed thin film prepared by the preparation method according to any one of claims 26 to 31.

34. The novel tobacco product as described in claim 33, characterized in that, The novel tobacco product is a heated cigarette, and its heating section includes the aforementioned thickened pulp sheet.

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