阅读说明：本技术 具有高松厚度的均质化烟草薄片及其制备方法 (Homogenized tobacco sheet having high bulk and method for making same ) 是由 徐善水 郭飞 杨江涛 尹恒 余泽新 于 2019-09-23 设计创作，主要内容包括：一种具有高松厚度的均质化烟草薄片,包括第一木浆纤维、第二木浆纤维、第一烟草粒子、第二烟草粒子以及薄片添加剂；所述第一木浆纤维的纤维长度不小于4mm,纤维粗度范围在30-40mg/100m,纤维帚化率范围为5％-15％；所述第二木浆纤维的纤维长度不大于0.2mm,纤维帚化率范围为10％-20％,纤维粗度范围为10-20mg/100m；所述第一烟草粒子的平均尺寸介于0.125毫米至0.250毫米之间；所述第二烟草粒子的平均尺寸介于0.01毫米至0.025毫米之间。本发明的均质化烟草薄片通过结合两种纤维的不同优势,制备出的烟草薄片既能达到物理性能指标要求,又能极大提高烟草薄片的松厚度,从而提升了烟草薄片的填充值。(A homogenized tobacco sheet having high bulk comprising first wood pulp fibers, second wood pulp fibers, first tobacco particles, second tobacco particles, and a sheet additive; the fiber length of the first wood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%; the fiber length of the second wood pulp fiber is not more than 0.2mm, the fiber brooming rate range is 10-20%, and the fiber thickness range is 10-20mg/100 m; the first tobacco particles have an average size of between 0.125 mm and 0.250 mm; the second tobacco particles have an average size between 0.01 mm and 0.025 mm. According to the homogenized tobacco sheet disclosed by the invention, different advantages of the two fibers are combined, so that the prepared tobacco sheet can meet the requirement of physical performance indexes, and the bulk of the tobacco sheet can be greatly improved, thereby improving the filling value of the tobacco sheet.)

1. homogenized tobacco sheet having a high bulk comprising first wood pulp fibers, second wood pulp fibers, first tobacco particles, second tobacco particles, and a sheet additive;

The fiber length of the first wood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%;

The fiber length of the second wood pulp fiber is not more than 0.2mm, the fiber brooming rate range is 10-20%, and the fiber thickness range is 10-20mg/100 m;

the first tobacco particles have an average size of between 0.125 mm and 0.250 mm;

The second tobacco particles have an average size between 0.01 mm and 0.025 mm.

2. Homogenized tobacco sheet according to claim 1, characterized in that the first wood pulp fibres are softwood pulp fibres.

3. Homogenized tobacco sheet according to claim 1 or 2, characterized in that the second wood pulp fibres are hardwood pulp fibres.

4. Homogenized tobacco sheet according to claim 1, characterized in that the weight ratio of the first wood pulp fibres to the second wood pulp fibres is in the range of 4: 1-1: 5.

5. Homogenized tobacco sheet according to claim 1, characterized in that the first wood pulp fibres and the second wood pulp fibres together represent 1.5-6% of the dry weight of the homogenized tobacco sheet.

6. Homogenized tobacco sheet according to claim 1, characterized in that the first and second tobacco particles are particles of tobacco material comprising a combination of any two or more of tobacco leaves, stems, sticks, powders.

7. homogenized tobacco sheet according to claim 6, characterized in that the first tobacco particles and the second tobacco particles together represent 45-95% of the homogenized tobacco sheet dry weight.

8. homogenized tobacco sheet according to claim 7, characterized in that the ratio of the first tobacco particles to the second tobacco particles is between 5: 1 and 1: 1.

9. homogenized tobacco sheet according to claim 1, characterized in that the sheet additive comprises: adhesive, aerosol generating agent, pH regulator and flavoring substance for cigarette.

10. Homogenized tobacco sheet according to claim 9, characterized in that the binder constitutes 0.5-5% of the homogenized tobacco sheet dry weight.

11. homogenized tobacco sheet according to claim 9, characterized in that the aerosol-generating agent constitutes 10-25% of the dry weight of the homogenized tobacco sheet.

12. Homogenized tobacco sheet according to claim 11, characterized in that the components of the aerosol-generating agent comprise any one or a combination of more of propylene glycol, glycerol, triethylene glycol, butanetriol, polyethylene glycol, pentanetriol, 1, 3-butanediol, dimethyl dodecanedioate.

13. Homogenized tobacco sheet according to claim 9, characterized in that the pH modifier is present in the range of 0.2-10% of the homogenized tobacco sheet dry weight.

14. Homogenized tobacco sheet according to claim 9, characterized in that the tobacco flavourant constitutes 2-10% of the homogenized tobacco sheet dry weight.

15. Homogenized tobacco sheet according to claim 1, characterized in that the mass to surface area ratio of the tobacco sheet is between 0.06-0.089mg/mm²。

16. A method of producing homogenized tobacco sheet according to any of claims 1-15, characterized in that it comprises the steps of:

(1) Pulping the first wood pulp according to the beating degree of 10-30 DEG SR to obtain first wood pulp fibers, wherein the fiber length of the first wood pulp fibers is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5-15%;

(2) Pulping the second wood pulp according to the beating degree of 10-60 DEG SR to obtain second wood pulp fibers, wherein the fiber length of the second wood pulp fibers is not more than 0.2mm, the fiber thickness range is 10-20mg/100m, and the fiber fibrillation rate range is 10-20%;

(3) mixing the first wood pulp fibers, the second wood pulp fibers, first tobacco particles with an average size of between 0.125 millimeters and 0.250 millimeters, second tobacco particles with an average size of between 0.01 millimeters and 0.025 millimeters, and a sheet additive to obtain a slurry;

(4) homogenizing the slurry to obtain homogenized slurry;

(5) Spreading the homogenized slurry in cast form on a support to obtain the homogenized tobacco sheet.

17. The method of claim 16 wherein the first wood pulp is softwood pulp and the second wood pulp is hardwood pulp.

18. The method as claimed in claim 16, wherein said (4) homogenizes the slurry to obtain a homogenized slurry having a viscosity in the range of 2000-8000 mpa.s.

19. The method according to claim 16, wherein the (4) homogenizes the slurry, and the mechanical stirring or ultrasonic vibration is used to homogenize the slurry in the homogenized slurry.

20. The method of claim 16, wherein the receiver comprises any one of a stainless steel strip, an aluminum magnesium alloy strip, and a titanium magnesium alloy strip.

Technical Field

The invention relates to the field of tobacco, in particular to a homogenized tobacco sheet with high bulk and a preparation method thereof.

background

The new tobacco products are of many types compared to the traditional cigarette products, and the technological innovation is continuously developed and correspondingly increased. At present, the main novel tobacco products comprise electronic atomized tobacco, heating non-combustible tobacco, buccal tobacco and snuff. The novel tobacco working mode is to bake and heat tobacco through a special heating rod to generate smoke, solid tobacco is heated to the low temperature below 350 ℃ during working, the atomization degree can be achieved, modes such as carbon heating, electric heating and ceramic heating are provided, the mode which does not need to burn can provide nicotine, the physiological needs of consumers can be met to a certain extent, and the tar amount is less.

The tobacco sheet is used as an important component of a novel tobacco product, and is a sheet or filiform regenerated product prepared by using waste tobacco materials such as tobacco powder, tobacco stems, tobacco shreds and the like in the cigarette making process as raw materials and used as a cigarette filler. Typically, tobacco sheets in the foreign prior art have a grammage of 200g/m2, a sheet thickness of 0.192mm, a sheet density of 1067.7mg/cm3, and a sheet bulk of 0.937cm 3/g; in the prior art in China, the gram weight of the tobacco sheet is 227g/m2, the thickness of the sheet is 0.185mm, the density of the sheet is 1227.0mg/cm3, and the bulk of the sheet is 0.815cm 3/g. Therefore, in the prior art, the tobacco sheets are low in bulk, poor in filling capacity and poor in overall performance, and are not beneficial to popularization and application of novel tobacco products.

Disclosure of Invention

In view of the above, it is an object of the present invention to provide a new homogenized tobacco sheet that overcomes the above-mentioned drawbacks of conventional tobacco sheets.

A homogenized tobacco sheet having high bulk comprising first wood pulp fibers, second wood pulp fibers, first tobacco particles, second tobacco particles, and a sheet additive;

the fiber length of the first wood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%;

The fiber length of the second wood pulp fiber is not more than 0.2mm, the fiber brooming rate range is 10-20%, and the fiber thickness range is 10-20mg/100 m;

the first tobacco particles have an average size of between 0.125 mm and 0.250 mm;

The second tobacco particles have an average size between 0.01 mm and 0.025 mm.

in one embodiment, the first wood pulp fibers are softwood pulp fibers.

in one embodiment, the second wood pulp fibers are hardwood pulp fibers.

In one embodiment, the weight ratio of the first wood pulp fibers to the second wood pulp fibers ranges from 4: 1 to 1: 5.

In one embodiment, the first wood pulp fibers and second wood pulp fibers together comprise between 1.5% and 6% of the dry weight of the homogenized tobacco sheet.

In one embodiment, the first and second tobacco particles are particles of tobacco material comprising a combination of any two or more of tobacco leaf, stem, label, or dust.

In one embodiment, the first tobacco particles and the second tobacco particles comprise 45% to 95% of the dry weight of the homogenized tobacco sheet.

In one embodiment, the ratio of the first tobacco particles to the second tobacco particles is between 5: 1 and 1: 1.

in one embodiment, the flake additive comprises: adhesive, aerosol generating agent, pH regulator and flavoring substance for cigarette.

In one embodiment, the binder comprises between 0.5% and 5% of the dry weight of the homogenized tobacco sheet.

In one embodiment, the aerosol-generating agent comprises 10% to 25% of the dry weight of the homogenized tobacco sheet.

In one embodiment, the aerosol generating composition comprises any one or more of propylene glycol, glycerol, triethylene glycol, butanetriol, polyethylene glycol, pentanetriol, 1, 3-butanediol, and dimethyl dodecanedioate.

In one embodiment, the pH adjusting agent comprises 0.2% to 10% of the dry weight of the homogenized tobacco sheet.

in one embodiment, the tobacco flavoring comprises between 2% and 10% of the dry weight of the homogenized tobacco sheet.

In one embodiment, the tobacco sheet has a mass to surface area ratio of 0.06-0.089mg/mm 2.

A method of preparing a homogenized tobacco sheet according to any of the above embodiments, said method comprising the steps of:

(1) Pulping the first wood pulp according to the beating degree of 10-30 DEG SR to obtain first wood pulp fibers, wherein the fiber length of the first wood pulp fibers is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5-15%;

(2) Pulping the second wood pulp according to the beating degree of 10-60 DEG SR to obtain second wood pulp fibers, wherein the fiber length of the second wood pulp fibers is not more than 0.2mm, the fiber thickness range is 10-20mg/100m, and the fiber fibrillation rate range is 10-20%;

(3) mixing the first wood pulp fibers and the second wood pulp fibers with tobacco particles and a sheet additive to obtain a slurry;

(4) Homogenizing the slurry to obtain homogenized slurry;

(5) The homogenized slurry was spread in cast form on a susceptor to give a homogenized tobacco sheet.

In one embodiment, the first wood pulp is softwood pulp and the second wood pulp is hardwood pulp.

In one embodiment, the step (4) of homogenizing the slurry to obtain the homogenized slurry in the homogenized slurry, wherein the viscosity of the homogenized slurry is in the range of 2000-.

In one embodiment, the step (4) of homogenizing the slurry is performed by homogenizing the slurry by mechanical stirring or ultrasonic vibration.

in one embodiment, the receiver comprises any one of a stainless steel strip, an aluminum magnesium alloy steel strip, and a titanium magnesium alloy steel strip.

according to the homogenized tobacco sheet, the first wood pulp fibers with the specific length longer than the traditional wood pulp fibers are selected, the second wood pulp fibers with the specific thickness thicker than the traditional wood pulp fibers are selected, and the porosity between the first wood pulp fibers and the porosity between the second wood pulp fibers are reasonably improved by controlling the beating degree range; meanwhile, the length of the first wood pulp fibers can ensure that the tobacco sheet has enough physical strength. In addition, the two different tobacco particles with specific particle sizes are matched with each other, and the second tobacco particles with smaller particle sizes effectively fill the pores among the first tobacco particles and among the wood pulp fibers, so that the filling value of the tobacco sheet is improved. Therefore, the homogenized tobacco sheet disclosed by the invention can meet the requirement of physical performance indexes, obviously improve the bulk of the tobacco sheet, improve the filling value of the tobacco sheet and improve the overall performance of the tobacco sheet by combining the synergistic advantages of two fibers and two tobacco particles.

Drawings

FIG. 1 is a flow chart of a method of producing a homogenized tobacco sheet having high bulk provided in an embodiment of the present invention;

figure 2 is a flow chart of a process for the preparation of a homogenized tobacco sheet product having a high bulk provided in an embodiment of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

a homogenized tobacco sheet comprising first wood pulp fibers, second wood pulp fibers, first tobacco particles, second tobacco particles, and a sheet additive; the fiber length of the first wood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%; the fiber length of the second wood pulp fiber is not more than 0.2mm, the fiber brooming rate range is 10-20%, and the fiber thickness range is 10-20mg/100 m; the first tobacco particles have an average size of between 0.125 mm and 0.250 mm; the second tobacco particles have an average size between 0.01 mm and 0.025 mm. Specifically, the fibrillation rate refers to the ratio of fluffing, tearing, splitting and the like of fiber cell walls in the fiber weight after pulping in pulping production.

Alternatively, the first wood pulp fibers may be softwood pulp fibers. Alternatively, the second wood pulp fibers may be hardwood pulp fibers. In one embodiment, the weight ratio of the first wood pulp fibers to the second wood pulp fibers ranges from 4: 1 to 1: 5. In one embodiment, the first wood pulp fibers and second wood pulp fibers together comprise between 1.5% and 6% of the dry weight of the homogenized tobacco sheet. Specifically, dry weight refers to the weight of cells after removal of all free water.

In one embodiment, the first and second tobacco particles are particles of tobacco material comprising a combination of any two or more of tobacco leaf, stem, label, or dust.

In one embodiment, the first tobacco particles and the second tobacco particles comprise 45% to 95% of the dry weight of the homogenized tobacco sheet. In one embodiment, the ratio of the first tobacco particles to the second tobacco particles is between 5: 1 and 1: 1. In the embodiment, the uniformity of the overall distribution of tobacco substances in the tobacco sheet is improved by selecting two types of tobacco particles with specific different sizes.

in one embodiment, the flake additive comprises: adhesive, aerosol generating agent, pH regulator and flavoring substance for cigarette. In particular, an adhesive is a substance having adhesive properties by which two separate materials are joined together. Aerosol-generating agents refer to formulations capable of generating an aerosol, which is a colloidal dispersion of small solid or liquid particles dispersed and suspended in a gaseous medium, also known as a gas dispersion. The dispersion phase is solid or liquid small particles with a size of 0.001-100 μm, and the dispersion medium is gas. Liquid aerosols are commonly referred to as mists, and solid aerosols are commonly referred to as mists. The pH regulator is also called acid-base regulator, and is used for changing or maintaining the pH value of the substance. The cigarette flavoring substance refers to a certain spice or a mixture of several spices applied to cigarettes.

In one embodiment, the binder comprises between 0.5% and 5% of the dry weight of the homogenized tobacco sheet. In one embodiment, the aerosol-generating agent comprises 10% to 25% of the dry weight of the homogenized tobacco sheet. In one embodiment, the aerosol generating composition comprises any one or more of propylene glycol, glycerol, triethylene glycol, butanetriol, polyethylene glycol, pentanetriol, 1, 3-butanediol, and dimethyl dodecanedioate. In one embodiment, the pH adjusting agent comprises 0.2% to 10% of the dry weight of the homogenized tobacco sheet. In one embodiment, the tobacco flavoring comprises between 2% and 10% of the dry weight of the homogenized tobacco sheet.

In one embodiment, referring to fig. 1 in combination, there is provided a method of preparing a homogenized tobacco sheet according to any of the above embodiments, said method comprising the steps of:

step S110, (1) pulping the first wood pulp according to the beating degree of 10-30 DEG SR to obtain first wood pulp fibers, wherein the fiber length of the first wood pulp fibers is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5-15%;

Step S120, (2) pulping the second wood pulp according to the beating degree of 10-60 DEG SR to obtain second wood pulp fibers, wherein the fiber length of the second wood pulp fibers is not more than 0.2mm, the fiber thickness range is 10-20mg/100m, and the fiber fibrillation rate range is 10-20%;

Step S130, (3) mixing the first wood pulp fibers, the second wood pulp fibers, first tobacco particles with the average size of 0.125 mm-0.250 mm, second tobacco particles with the average size of 0.01 mm-0.025 mm and a sheet additive to obtain slurry;

Step S140, (4) homogenizing the slurry to obtain a homogenized slurry; specifically, the method of homogenizing the slurry may be mechanical stirring or ultrasonic shaking; optionally, the viscosity of the homogenized slurry is in the range of 2000-.

Step S150, (5) spreading the homogenized slurry on a support in a cast form to obtain a homogenized tobacco sheet. In one embodiment, the receiver comprises any one of a stainless steel strip, an aluminum magnesium alloy steel strip, and a titanium magnesium alloy steel strip. Preferably, the receptacle is a stainless steel strip.

Referring also to figure 2, a flow chart of a process for making a homogenized tobacco sheet product having high bulk is provided. As shown in fig. 2, after tobacco material particles 210 including tobacco stems, shredded tobacco, stem sticks, and smoke are uniformly mixed in step S210, grinding is performed in step S220 to obtain mixed particles; screening by step S230 to obtain first tobacco particles 230 having an average size of between 0.125 mm and 0.250 mm and second tobacco particles 220 having an average size of between 0.01 mm and 0.025 mm; the step S240 of homogenizing the slurry obtained by mixing the first wood pulp fiber 240, the second wood pulp fiber 250, and the sheet additive 260 including water, a binder, an aerosol generating agent, a PH adjusting agent, and a flavoring substance for cigarettes to obtain a homogenized slurry 270; step S250 is carried out on the homogenized slurry in sequence, and the homogenized slurry is spread on a receiving object in a casting mode to obtain a tobacco sheet; step S260, drying the tobacco sheets to obtain dry tobacco sheets; step S270, stripping the dry tobacco sheets from the supporting objects to obtain whole tobacco sheets, and step S280, cutting the whole tobacco sheets to obtain bulk tobacco sheets; step S290 packages the bulk tobacco sheets to obtain tobacco sheet products.

comparative example 1 of the present invention is illustrated below:

A homogenized tobacco sheet having high bulk comprising first wood pulp fibers, tobacco particles, a sheet additive; the first wood pulp fiber is selected from softwood pulp fiber, the beating degree of the fiber is 30 DEG SR, the length of the softwood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%; wherein the tobacco particles are first tobacco particles with a particle diameter of 0.15 mm.

Comparative example 2 of the present invention is illustrated below:

A homogenized tobacco sheet having high bulk comprising first wood pulp fibers, tobacco particles, a sheet additive; the first wood pulp fiber is selected from softwood pulp fiber, the beating degree of the fiber is 30 DEG SR, the length of the softwood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%; wherein the tobacco particles are second tobacco particles with a particle diameter of 0.02 mm.

Comparative example 3 of the present invention is illustrated below:

a homogenized tobacco sheet having high bulk comprising second wood pulp fibers, tobacco particles, a sheet additive; the second wood pulp fiber is hardwood pulp fiber, the beating degree of the fiber is 30 degrees SR, the length of the softwood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%; wherein the tobacco particles are first tobacco particles with a particle diameter of 0.15 mm.

comparative example 4 of the present invention is illustrated below:

A homogenized tobacco sheet having high bulk comprising second wood pulp fibers, tobacco particles, a sheet additive; the second wood pulp fiber is hardwood pulp fiber, the beating degree of the fiber is 30 degrees SR, the length of the softwood pulp fiber is not less than 4mm, the fiber thickness range is 30-40mg/100m, and the fiber fibrillation rate range is 5% -15%; wherein the tobacco particles are second tobacco particles with a particle diameter of 0.02 mm.

The following describes specific example 1 of the present invention:

Homogenized tobacco sheet having high bulk comprising first wood pulp fibers, second wood pulp fibers, first tobacco particles, second tobacco particles, a sheet additive. Wherein the first wood pulp fiber is selected from softwood pulp fiber, the fiber beating degree is 15 DEG SR, the length of the softwood pulp fiber is more than 5mm, the fiber fibrillation rate is controlled to be 10%, and the fiber thickness is more than 40mg/100 m; the second wood pulp fiber is hardwood pulp fiber with a beating degree of 20 DEG SR, a fiber length of more than 0.18mm, a fiber fibrillation rate of 15% and a fiber thickness of more than 20mg/100 m.

preferably, the weight ratio of softwood pulp fibers to hardwood pulp fibers is 1: 2. Preferably, the tobacco particles comprise 80% of the dry weight of the homogenized tobacco sheet.

Preferably the two types of tobacco material are comminuted by high speed shearing into two sizes of tobacco particles, preferably wherein the first tobacco particles have an average size of between 0.125 mm and 0.150 mm and the second tobacco particles have an average size of between 0.02mm and 0.025 mm; preferably, the ratio of the first tobacco particles to the second tobacco particles is between 4: 1, wherein the first tobacco particles are larger and more dense in size relative to the second tobacco particles and are the predominant tobacco material, and the second tobacco particles are smaller and less dense and function to fill the interstices between the first tobacco particles. The size and proportion of the first tobacco particles and the second tobacco particles are complementary, so that the uniformity of the overall distribution of the tobacco substances in the tobacco sheet is improved. Specifically, the tobacco material comprises any two or more of tobacco leaves, tobacco stems, tobacco sticks and tobacco powder.

the flake additive includes: adhesive, aerosol generating agent, pH regulator and flavoring substance for cigarette. Preferably, the binder constitutes 2.5% of the dry weight of the homogenized tobacco sheet. Preferably, said aerosol generating means is glycerol and comprises 20% of the dry weight of said homogenized tobacco sheet. Preferably, the tobacco flavoring substance is a natural tobacco flavor, and accounts for 8% of the dry weight of the homogenized tobacco sheet. Preferably, the pH adjusting agent is citric acid, representing 0.5% of the dry weight of the homogenized tobacco sheet.

Mechanically stirring the softwood pulp fibers and the hardwood pulp fibers with the preferred values, the tobacco particles and the sheet additives to obtain high-quality homogenized pulp. The above-mentioned high-quality homogenized slurry was spread as a cast on a stainless steel belt to obtain a homogenized tobacco sheet of preferred example 1.

The following describes specific example 2 of the present invention:

Homogenized tobacco sheet having high bulk comprising first wood pulp fibers, second wood pulp fibers, first tobacco particles, second tobacco particles, a sheet additive. Wherein the first wood pulp fiber is selected from softwood pulp fiber, the fiber beating degree is 10 DEG SR, the length of the softwood pulp fiber is more than 5mm, the fiber fibrillation rate is controlled to be 15%, and the fiber thickness is more than 40mg/100 m; the second wood pulp fiber is hardwood pulp fiber with a beating degree of 10 DEG SR, a fiber length of more than 0.20mm, a fiber fibrillation rate of 15% and a fiber thickness of more than 20mg/100 m.

Preferably, the weight ratio of softwood pulp fibers to hardwood pulp fibers is 1: 1. Preferably, the two types of tobacco material are comminuted by high shear to two sizes of tobacco particles, preferably wherein the first tobacco particles have an average size of between 0.200 mm and 0.250 mm, the second tobacco particles have an average size of between 0.02mm and 0.025 mm, and preferably the ratio of the first tobacco particles to the second tobacco particles is between 2: 1, wherein the first tobacco particles are larger and more predominantly in size relative to the second tobacco particles and are the predominant tobacco material, and the second tobacco particles are smaller and less predominantly in size and act to fill the interstices of the first tobacco particles. The size and proportion of the first tobacco particles and the second tobacco particles are complementary, so that the uniformity of the overall distribution of the tobacco substances in the tobacco sheet is improved. Specifically, the tobacco material comprises any two or more of tobacco leaves, tobacco stems, tobacco sticks and tobacco powder. Preferably, the tobacco particles comprise 85% of the dry weight of the homogenized tobacco sheet. The flake additive includes: adhesive, aerosol generating agent, pH regulator and flavoring substance for cigarette. Preferably, the binder is methylcellulose and guar gum at 2.5% of the homogenized tobacco sheet dry weight. Preferably, the aerosol generating means is glycerol and propylene glycol, wherein the weight ratio of glycerol to propylene glycol is 5: 1, representing 25% of the dry weight of the homogenized tobacco sheet. Preferably, the tobacco flavoring substance is a natural tobacco flavor, and accounts for 8% of the dry weight of the homogenized tobacco sheet. Preferably, the pH adjusting agent is citric acid and malic acid, wherein the ratio of citric acid to malic acid is 1: 1, and comprises 0.5% of the dry weight of the homogenized tobacco sheet.

And (3) carrying out ultrasonic oscillation on the softwood pulp fibers and the hardwood pulp fibers with the optimized values, the tobacco particles and the sheet additive to obtain high-quality homogenized pulp. The above-mentioned high-quality homogenized slurry was spread as a cast on a stainless steel belt to obtain a homogenized tobacco sheet of preferred example 2.

The effects on the properties and bulk of the tobacco sheets of the above comparative examples 1-4, and specific examples 1-2 are as follows:

According to the homogenized tobacco sheet, the first wood pulp fibers with the specific length longer than the traditional wood pulp fibers are selected, the second wood pulp fibers with the specific thickness thicker than the traditional wood pulp fibers are selected, and the porosity between the first wood pulp fibers and the porosity between the second wood pulp fibers are reasonably improved by controlling the beating degree range; meanwhile, the length of the first wood pulp fibers can ensure that the tobacco sheet has enough physical strength. In addition, the two different tobacco particles with specific particle sizes are matched with each other, and the second tobacco particles with smaller particle sizes effectively fill the pores among the first tobacco particles and among the wood pulp fibers, so that the filling value of the tobacco sheet is improved. Therefore, the homogenized tobacco sheet disclosed by the invention can meet the requirement of physical performance indexes, obviously improve the bulk of the tobacco sheet and improve the filling value of the tobacco sheet by combining the synergistic advantages of two fibers and two tobacco particles, so that the overall performance of the tobacco sheet is improved.

The features of the above embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be considered as within the scope of the present specification as long as there is no contradiction between the combinations of the features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.