CN111364289A - Cigarette paper with low air permeability variation coefficient and preparation method thereof - Google Patents
Cigarette paper with low air permeability variation coefficient and preparation method thereof Download PDFInfo
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- CN111364289A CN111364289A CN201811601666.7A CN201811601666A CN111364289A CN 111364289 A CN111364289 A CN 111364289A CN 201811601666 A CN201811601666 A CN 201811601666A CN 111364289 A CN111364289 A CN 111364289A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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Abstract
The invention provides a cigarette paper with low air permeability variation coefficient and a preparation method thereof, wherein the cigarette paper is prepared from the following components in parts by mass: 65-85 parts of fibers; 0.05-0.15 parts of pulping enzyme; 15-35 parts of a filler; 0.5-8 parts of a combustion improver; 0.5-1.5 parts of hydroxypropyl cellulose; the cigarette paper disclosed by the invention realizes low air permeability variation coefficient, keeps stable air permeability variation coefficient of the cigarette paper, achieves the effect of improving the quality of cigarettes, and is lower in cost, simple and convenient to operate and convenient to transfer to production quickly.
Description
Technical Field
The invention relates to the technical field of cigarette packaging paper, in particular to cigarette paper with low air permeability variation coefficient and a preparation method thereof.
Background
The cigarette paper is used as an auxiliary material of cigarettes, although the mass of the cigarette paper only accounts for 5 percent of the mass of the whole cigarettes, the cigarette paper is one of essential raw materials in the cigarette manufacturing process and plays an important role in the tobacco industry. Compared with other cigarette accessories, the air permeability of the cigarette paper influences the ventilation performance of the cigarette, further influences the combustion, the suction resistance, the carbon monoxide release amount of the cigarette during combustion, the nicotine content of the cigarette, the tar content and the like, and is an important accessory influencing the quality of the cigarette.
The paper making is continuous production in a transverse width mode, and compared with the air permeability of one point of paper, the variation coefficient of the air permeability is obtained by acquiring the air permeability of a plurality of points in the transverse direction and the longitudinal direction of the cigarette paper and measuring according to the specification of YC/T172. The air permeability variation coefficient of the cigarette paper is data for judging the stability of the air permeability of the cigarette paper, and the lower the air permeability variation coefficient is, the smaller the integral air permeability difference value of the cigarette paper is, the higher the stability is.
In recent years, along with the continuous improvement of cigarette quality requirements, the cigarette industry has more and more strict requirements on the air permeability variation coefficient of cigarette paper. The conventional process of proportioning and pulping softwood pulp and staple wood pulp is adopted to prepare the cigarette paper at present, the method cannot stably control the cigarette paper under a lower air permeability variation coefficient (the air permeability variation coefficient is less than or equal to 4.5 percent), and the method can not meet the requirement of the cigarette industry on lower air permeability variation coefficient gradually.
In the prior art, the Chinese patent of invention (patent No. CN 201410833439) discloses an online processing method for adjusting and controlling the air permeability of cigarette paper, which adopts an online laser drilling mode to control the air permeability of the cigarette paper, thereby improving the stability of the air permeability of the cigarette paper and reducing the variation coefficient of the air permeability. However, the use of this method requires improvements in cigarette machine construction, which undoubtedly increases the cost of cigarette manufacture.
Disclosure of Invention
The invention aims to provide cigarette paper with low air permeability variation coefficient and a preparation method thereof, which can improve the air permeability uniformity of the cigarette paper, realize that the cigarette paper has low air permeability variation coefficient and further improve the cigarette quality.
In order to achieve the purpose, the invention provides cigarette paper which is prepared from the following components in parts by mass:
65-85 parts of fibers;
0.05-0.15 parts of pulping enzyme;
15-35 parts of a filler;
0.5-8 parts of a combustion improver;
0.5-1.5 parts of hydroxypropyl cellulose;
wherein, the fibre includes first fibre and second fibre, first fibre is softwood pulp fibre and/or jute pulp fibre, the second fibre is hardwood pulp fibre.
Further, in the cigarette paper, the fibers are preferably 70 to 80 parts by mass.
Further, in the cigarette paper, the preferable mass part of the pulping enzyme is 0.06-0.01 part.
Further, in the cigarette paper, the filler comprises calcium carbonate and/or talcum powder, and the mass part of the filler is preferably 20-35 parts.
Further, in the cigarette paper, the combustion improver comprises one or more of citrate, malate, tartrate, lactate, alginic acid and fumaric acid.
Further, in the cigarette paper, the combustion improver is preferably 1 to 5 parts by mass.
Further, in the cigarette paper, the hydroxypropyl cellulose is preferably 0.6 to 1.0 part by mass.
In addition, the invention also provides a preparation method of the cigarette paper, which comprises the following steps:
the first fibers and the second fibers are respectively pumped into a long fiber pulp storage tank and a short fiber pulp storage tank for storage after being disintegrated;
after the pH value and the temperature in the long fiber pulp storage tank are adjusted, the pulping enzyme is added into the long fiber pulp storage tank, is stirred and reacts with the first fiber, and is circularly pulped to obtain a first pulp;
defibering second fibers in the short fiber pulp storage tank by a high-distribution defibering machine to obtain second pulp;
mixing the first slurry, the second slurry and the filler, and then making to obtain mixed slurry;
sequentially carrying out wire section forming, squeezing dehydration, embossing and first drying on the mixed slurry to obtain a first dried paper web;
dissolving the combustion improver and the hydroxypropyl cellulose in water to prepare a mixed solution;
and performing surface sizing on the first dried paper web by using the mixed solution as a sizing agent, and performing secondary drying on the sized first dried paper web to obtain the cigarette paper.
Further, in the above method for producing cigarette paper, the step of adjusting the PH and temperature in the long fiber slurry reservoir specifically comprises:
adjusting the pH value of the long fiber slurry storage tank to be 6-9.5, and adjusting the temperature of the long fiber slurry storage tank to be 22-65 ℃.
Further, in the preparation method of the cigarette paper, the step of dissolving the combustion improver and the hydroxypropyl cellulose in water to prepare a mixed solution specifically comprises the following steps:
taking a preset water amount according to the mass part of the hydroxypropyl cellulose, and heating 20-30% of the preset water amount to above 60 ℃;
slowly adding hydroxypropyl cellulose into the heated water, fully stirring, adding the rest 80-70% of the preset water after all the hydroxypropyl cellulose is added, and stirring for 30-60 minutes until all the hydroxypropyl cellulose is completely dissolved;
and adding the combustion improver into the hydroxypropyl cellulose dissolving solution, and uniformly stirring for 30 minutes to prepare a mixed solvent.
According to the cigarette paper and the preparation method thereof, the softwood pulp fibers of the cigarette paper are treated by adding the softwood pulping enzyme before pulping, so that the air permeability uniformity of the cigarette paper is improved, the low air permeability variation coefficient is realized, the stability of the air permeability variation coefficient of the cigarette paper is maintained, and the effect of improving the quality of the cigarette is achieved. Moreover, the cigarette paper preparation method provided by the invention has the advantages of low cost, simple and convenient operation and convenient and rapid production transfer.
Detailed Description
In order to achieve the above object, preferred embodiments of the present invention are described in detail below.
The invention provides cigarette paper which is prepared from the following components in parts by mass: 65-85 parts of fibers; 0.05-0.15 parts of pulping enzyme; 15-35 parts of a filler; 0.5-8 parts of a combustion improver; 0.5-1.5 parts of hydroxypropyl cellulose; wherein, the fibre includes first fibre and second fibre, first fibre is softwood pulp fibre and/or jute pulp fibre, the second fibre is hardwood pulp fibre.
In one embodiment of the present invention, the fiber is preferably 70 to 80 parts by mass, and more preferably 85 parts by mass.
As an embodiment of the present invention, when the fibers include wood pulp fibers and hemp pulp fibers, the mass content of the hemp pulp fibers is preferably not greater than 40%, and more preferably 15-25%.
The pulping enzyme comprises cellulase, hemicellulase and fiber modifying enzyme.
As an embodiment of the present invention, the pulping enzyme is a softwood pulping enzyme.
As an embodiment of the invention, the mass part of the pulping enzyme is preferably 0.06-0.01 part.
The filler comprises calcium carbonate and/or talcum powder, and the particle size of the filler is 2-20 mu m.
In one embodiment of the present invention, the filler is preferably 20 to 35 parts by mass, and more preferably 25 to 30 parts by mass.
As an embodiment of the present invention, when the filler includes calcium carbonate and talc, the addition amounts of the two components are not particularly limited, and any mixture ratio may be adopted.
The combustion improver comprises one or more of citrate, malate, tartrate, lactate, alginic acid and fumaric acid.
In one embodiment of the present invention, the mass part of the combustion improver is preferably 1 to 5 parts, and more preferably 2 to 3 parts.
The citrate comprises potassium citrate and/or sodium citrate; the malate comprises potassium malate and/or sodium malate; the tartrate comprises potassium tartrate and/or sodium tartrate; the lactate comprises lactic acid and/or sodium lactate; the alginic acid comprises potassium alginate and/or sodium alginate; the fumaric acid comprises potassium fumarate and/or sodium fumarate. In an embodiment of the present invention, when the combustion improver is two or more of the above components, the addition amount of each component is not particularly limited, and any mixture ratio may be adopted.
In one embodiment of the present invention, the hydroxypropyl cellulose is preferably 0.6 to 1.0 part by mass.
In addition, the invention also provides a preparation method of the cigarette paper, which comprises the following steps:
the first fibers and the second fibers are respectively pumped into a long fiber pulp storage tank and a short fiber pulp storage tank for storage after being disintegrated;
after the pH value and the temperature in the long fiber pulp storage tank are adjusted, the pulping enzyme is added into the long fiber pulp storage tank, is stirred and reacts with the first fiber, and is circularly pulped to obtain a first pulp;
defibering second fibers in the short fiber pulp storage tank by a high-distribution defibering machine to obtain second pulp;
mixing the first slurry, the second slurry and the filler, and then making to obtain mixed slurry;
sequentially carrying out wire section forming, squeezing dehydration, embossing and first drying on the mixed slurry to obtain a first dried paper web;
dissolving the combustion improver and the hydroxypropyl cellulose in water to prepare a mixed solution;
and performing surface sizing on the first dried paper web by using the mixed solution as a sizing agent, and performing secondary drying on the sized first dried paper web to obtain the cigarette paper.
According to the invention, the first fiber and the second fiber are respectively disintegrated in different hydraulic pulpers and are pumped into a long fiber pulp storage tank and a short fiber pulp storage tank through pipelines to be respectively stored; and adding a food-grade alkaline additive into the long fiber pulp storage tank, and adjusting the pH value of the pulp and the temperature of the pulp storage tank. Adding alkaline environment softwood pulping enzyme into the long fiber pulp storage tank, and stirring by using a stirrer to enable the pulping enzyme to fully react with the first fibers for a period of time; and circularly pulping the first fibers uniformly stirred in the long fiber pulp storage tank.
The invention is not limited to the above-mentioned crushing and beating, and the technical scheme of crushing and beating known to those skilled in the art can be adopted.
As an embodiment of the invention, the wood pulp disintegration is preferably carried out in a hydropulper; the mass concentration of the crushed slurry obtained after the crushing is preferably 2-5%, and more preferably 3-4%.
In order to enable the pulping enzyme to be in an active working environment, the pH range and the temperature range of the first slurry in the long fiber slurry storage tank need to be adjusted, and the first slurry is uniformly stirred for a period of time by a stirrer, so that the pulping enzyme and the first fibers are ensured to fully react.
The step of adjusting the pH value and the temperature in the long fiber slurry storage tank specifically comprises the following steps:
adjusting the pH value of the long fiber slurry storage tank to be 6-9.5, and adjusting the temperature of the long fiber slurry storage tank to be 22-65 ℃.
In an embodiment of the present invention, the PH value in the long fiber slurry storage tank is preferably adjusted to 6.5 to 7.5.
In an embodiment of the present invention, the temperature in the long fiber slurry storage tank is preferably adjusted to 30 to 45 ℃.
There are various methods for adjusting the PH value in the long fiber slurry storage tank, and in this embodiment, a food-grade alkaline additive is added to the long fiber slurry storage tank to adjust the PH value, where the food-grade alkaline additive includes sodium bicarbonate and/or sodium phosphate.
In an embodiment of the present invention, the stirring reaction time of the pulping enzyme and the first fiber in the long fiber storage tank is preferably 30 to 150 minutes, and more preferably 60 to 120 minutes.
As an embodiment of the invention, the first fiber beating is preferably carried out in a grinding disc, and the beating degree of the first fibers is 60-100 degrees, more preferably 70-90 degrees, and most preferably 80 degrees.
The invention carries out mechanical or fluid treatment on the fibers by beating, so that the fibers are subjected to shearing force, the shape of the fibers is changed, and the cigarette paper obtained by the subsequent steps of papermaking and the like can meet the expected physical index requirement of the cigarette paper.
In the invention, the second fiber pulp passes through the high-frequency fluffer to disperse fibers, so that the web forming is convenient, and the cigarette paper obtained through the subsequent steps of papermaking and the like can meet the expected physical index requirement of the cigarette paper.
In the present invention, the fiber slurry is preferably mixed with an aqueous filler solution and then papermaking is performed, and the mass concentration of the aqueous filler solution is preferably 8 to 20%, and more preferably 10 to 15%. The paper making method of the present invention is not particularly limited, and a paper making method known to those skilled in the art may be used.
The specific operation methods of the wire section forming, press dewatering, embossing and first drying in the present invention are not particularly limited, and those known to those skilled in the art may be used.
In an embodiment of the present invention, the wet paper web obtained after press dewatering has a moisture content of preferably 40 to 60%, more preferably 45 to 55%, and most preferably 50%.
As an embodiment of the present invention, the initial temperature of the first drying is preferably 60 to 70 ℃, and more preferably 65 ℃; the termination temperature of the first drying is preferably 100 to 110 ℃, and more preferably 105 ℃.
The first drying is preferably carried out by adopting a drying cylinder group, and particularly, the temperature is gradually increased to 100-110 ℃ by taking 60-70 ℃ as an initial temperature. The time of the first drying and the specific setting conditions of the drying cylinder group are not specially limited, and the uniform drying and the humidity of the first dried paper web obtained after the first drying can meet the requirements.
As an embodiment of the invention, the moisture content of the first dried paper web is preferably 3-15%, more preferably 5-10%.
The sizing agent adopted by the surface sizing is a dispersion system comprising a combustion improver and hydroxypropyl cellulose, and the invention has no special limitation on the contents of the combustion improver and the cigarette paper with low air permeability variation coefficient in the sizing agent, and can ensure that the surface sizing is carried out smoothly. In the present invention, the sizing agent is preferably a dispersion of a combustion improver, hydroxypropylcellulose and water, and more preferably an aqueous combustion improver solution obtained by mixing a combustion improver and water
Namely, the step of dissolving the combustion improver and the hydroxypropyl cellulose in water to prepare the mixed solution specifically comprises the following steps:
taking a preset water amount according to the mass part of the hydroxypropyl cellulose, and heating 20-30% of the preset water amount to above 60 ℃;
slowly adding hydroxypropyl cellulose into the heated water, fully stirring, adding the rest 80-70% of the preset water after all the hydroxypropyl cellulose is added, and stirring for 30-60 minutes until all the hydroxypropyl cellulose is completely dissolved;
and adding the combustion improver into the hydroxypropyl cellulose dissolving solution, and uniformly stirring for 30 minutes to prepare a mixed solvent.
In an embodiment of the present invention, the mass concentration of the combustion improver aqueous solution is preferably 0.5 to 8%, and more preferably 1.5 to 4.5%.
In an embodiment of the present invention, the surface sizing method is one of single-side coating, double-side spray immersion, gravure coating, comma roll coating, and nip extrusion coating. The specific operation method of the surface sizing is not particularly limited in the present invention, and the operation method known to those skilled in the art can be adopted.
As an embodiment of the present invention, the starting temperature of the second drying is preferably 40 to 50 ℃, and more preferably 45 ℃; the termination temperature of the second drying is preferably 70-80 ℃, and more preferably 75 ℃.
As an embodiment of the present invention, the second drying is preferably performed by using a drying cylinder set, specifically, the temperature is gradually increased to 70-80 ℃ by using 40-50 ℃ as an initial temperature. The time of the second drying and the specific setting conditions of the drying cylinder group are not specially limited, and the uniform drying and the humidity of the second dried paper web obtained after the second drying can meet the requirements.
As an embodiment of the invention, the moisture content of the second dried paper web is preferably 4-6%, more preferably 4.5-5%.
After the second drying is finished, the second dried paper web is preferably coiled, rewound, cut and packaged in sequence to obtain the cigarette paper with the low air permeability coefficient of variation. The specific operation method of the winding, rewinding, cutting and packaging is not particularly limited in the invention, and the operation method known to those skilled in the art can be adopted.
The cigarette paper with low air permeability coefficient of variation is quantitatively designed to be 20-60 g/m2, the air permeability is designed to be 20-110 Kerata, and the air permeability coefficient of variation of the cigarette paper is less than or equal to 5%.
According to the invention, on the basis of not changing the existing production equipment, softwood pulp fibers of the cigarette paper are treated by adding softwood pulping enzyme before pulping, so that the fiber polymerization, fiber devillicate fibrillation and water absorption swelling performance are improved, the smoothness of the paper is improved, the cigarette paper smoothness can be improved by the hydroxypropyl cellulose, the fiber swelling degree, the paper bulk density and tiny fiber attachment are improved, the difference between two surfaces is reduced, the air permeability uniformity of the cigarette paper is improved, the low air permeability variation coefficient is realized, the air permeability variation coefficient of the cigarette paper is kept stable, and the effect of improving the cigarette quality is achieved. Moreover, the cigarette paper preparation method provided by the invention does not pollute the production line, is simple and convenient to operate, and is convenient and rapid to transfer to production.
The cigarette paper and the preparation method thereof according to the present invention will be described with reference to the following specific examples:
example 1
260kg of softwood pulp fibers are pulped in a hydrapulper to obtain softwood pulp with the mass concentration of 3%; pumping the disintegrated softwood pulp fibers into a long fiber pulp storage tank through a pipeline, adjusting the pH value interval in the pulp storage tank to be 6.5-7.5 through sodium phosphate, and adjusting the temperature interval in the long fiber pulp storage tank to be 30-45 ℃; then, adding 1.0kg of softwood pulping enzyme into 50L of water at the water temperature of 30-45 ℃, uniformly stirring, adding into the long fiber pulp storage tank, and uniformly stirring the pulp in the long fiber pulp storage tank for 90 minutes by using a stirrer under the condition that the temperature interval is ensured to be 30-45 ℃; and circularly pulping the pulp which is added with the pulping enzyme and uniformly mixed through a disc mill to obtain a first pulp with a beating degree of 90 degrees.
540kg of hardwood pulp fibers are pulped in a hydrapulper to obtain pulped pulp with the mass concentration of 3 percent; and defibering the disintegrated hardwood pulp fibers by a high-frequency defibering machine to obtain second pulp.
Mixing 350kg of calcium carbonate (with the granularity of 2-20 mu m) with water to obtain a calcium carbonate solution with the mass concentration of 12%; mixing the calcium carbonate solution with the first slurry and the second slurry, and then making to obtain mixed slurry;
sequentially carrying out net part forming and squeezing dehydration on the mixed slurry to obtain a wet paper web with the humidity of 50%; embossing and first drying the wet paper web in sequence (gradually raising the temperature from an initial drying temperature of 65 ℃ to a final drying temperature of 105 ℃) to obtain a first dried paper web with the humidity of 10%;
mixing a combustion improver (comprising 10kg of potassium citrate and 10kg of sodium citrate) with 1.1m of 3 water to obtain a combustion improver solution, and mixing the combustion improver solution with 5kg of hydroxypropyl cellulose powder to obtain a mixed solution;
taking the mixed solution as a sizing agent, performing surface sizing on the first dried paper web in a double-sided spraying and soaking mode, then performing second drying (gradually raising the temperature to 75 ℃ from the initial drying temperature of 45 ℃ to the final drying temperature, and controlling the humidity of the obtained second dried paper web to be 5%), and finally sequentially performing coiling, rewinding, slitting and packaging to obtain the low-permeability variation coefficient cigarette paper; wherein, the quantitative index of the cigarette paper with the low air permeability coefficient of variation is controlled to be 32g/m2, and the air permeability is controlled to be 50 Kerista, namely the cigarette paper is No. 1.
Example 2
Cigarette paper with low air permeability coefficient of variation was prepared according to the method of example 1, except that: the fibers comprise 260kg of softwood pulp fibers, 540kg of hardwood pulp fibers and 400kg of calcium carbonate, and the combustion improver comprises 25kg of potassium malate, 5kg of sodium citrate and 8kg of hydroxypropyl cellulose; the quantitative index of the cigarette paper with the low air permeability coefficient of variation is controlled to be 28g/m2, the air permeability is controlled to be 60 Kerista, namely the cigarette paper is No. 2.
Example 3
Cigarette paper with low air permeability coefficient of variation was prepared according to the method of example 1, except that: the fiber comprises 180kg of softwood pulp fiber, 80kg of hemp pulp fiber, 540kg of hardwood pulp fiber and 450kg of calcium carbonate, the combustion improver comprises 25kg of potassium citrate and the hydroxypropyl cellulose is 8 kg; the quantitative index of the cigarette paper with the low air permeability coefficient of variation is controlled to be 20g/m2, the air permeability is controlled to be 60 Kerista, namely the cigarette paper is No. 3.
Example 4
Cigarette paper with low air permeability coefficient of variation was prepared according to the method of example 1, except that: the fibers comprise 260kg of softwood pulp fibers and 540kg of hardwood pulp fibers, 0.6kg of softwood pulping enzyme is added, 400kg of calcium carbonate is added, and the combustion improver comprises 25kg of potassium malate, 5kg of sodium citrate and 8kg of hydroxypropyl cellulose; the quantitative index of the cigarette paper with the low air permeability coefficient of variation is controlled to be 28g/m2, the air permeability is controlled to be 60 Kerista, namely the cigarette paper is No. 4.
Example 5
Cigarette paper with low air permeability coefficient of variation was prepared according to the method of example 1, except that: the fibers comprise 260kg of softwood pulp fibers and 540kg of hardwood pulp fibers, 0.8kg of softwood pulping enzyme is added, 400kg of calcium carbonate is added, and the combustion improver comprises 25kg of potassium malate, 5kg of sodium citrate and 8kg of hydroxypropyl cellulose; the quantitative index of the cigarette paper with the low air permeability coefficient of variation is controlled to be 28g/m2, the air permeability is controlled to be 60 Kerista, namely the cigarette paper is No. 5.
Example 6
Cigarette paper with low air permeability coefficient of variation was prepared according to the method of example 1, except that: the fibers comprise 260kg of softwood pulp fibers and 540kg of hardwood pulp fibers, 0.8kg of softwood pulping enzyme is added, 400kg of calcium carbonate is added, and the combustion improver comprises 25kg of potassium malate, 5kg of sodium citrate and 8kg of hydroxypropyl cellulose; the quantitative index of the cigarette paper with the low air permeability coefficient of variation is controlled to be 28g/m2, the air permeability is controlled to be 60 Kerista, namely the cigarette paper is No. 6.
Example 7
Comparative example: 260kg of softwood pulp fibers are pulped in a hydrapulper to obtain pulped pulp with the mass concentration of 3%; circularly pulping the needle-leaved wood crushed pulp through a disc mill to obtain first pulp with a beating degree of 90 degrees; 540kg of hardwood pulp fibers are pulped in a hydrapulper to obtain hardwood pulping pulp with the mass concentration of 3%; defibering the broken hardwood pulp fibers by a high-frequency defibering machine to obtain second pulp;
mixing 350kg of calcium carbonate (with the granularity of 2-20 mu m) with water to obtain a calcium carbonate solution with the mass concentration of 12%; mixing the calcium carbonate solution with the first slurry and the second slurry, and then making to obtain mixed slurry;
sequentially carrying out net part forming and squeezing dehydration on the mixed slurry to obtain a wet paper web with the humidity of 50%; embossing and first drying the wet paper web in sequence (gradually raising the temperature from an initial drying temperature of 65 ℃ to a final drying temperature of 105 ℃) to obtain a first dried paper web with the humidity of 10%;
mixing a combustion improver (comprising 10kg of potassium citrate and 10kg of sodium citrate) with 1.1m of 3 water to obtain a combustion improver solution; taking the combustion improver solution as a sizing agent, performing surface sizing on the first dried paper web in a double-sided spraying and soaking mode, then performing second drying (gradually raising the temperature to 75 ℃ from the initial drying temperature of 45 ℃ to the final drying temperature, and controlling the humidity of the obtained second dried paper web to be 5%), and finally sequentially performing coiling, rewinding, slitting and packaging to obtain blank control cigarette paper; wherein the quantitative index of the blank control cigarette paper is controlled to be 32g/m2, and the air permeability is controlled to be 50 Kerista, namely 7# of the cigarette paper.
Example 8
A blank control cigarette paper was prepared according to the method of example 7, except that: the fibers comprise 260kg of softwood pulp fibers, 540kg of hardwood pulp fibers and 300kg of calcium carbonate, and the combustion improver comprises 25kg of potassium malate and 5kg of sodium citrate; the quantitative index of the blank control cigarette paper is controlled to be 28g/m2, and the air permeability is controlled to be 60 Kerista, namely cigarette paper No. 8.
Example 9
A blank control cigarette paper was prepared according to the method of example 7, except that: the fiber comprises 180kg of softwood pulp fiber, 80kg of hemp pulp fiber, 540kg of hardwood pulp fiber, 450kg of calcium carbonate and 25kg of potassium citrate as a combustion improver; the quantitative index of the blank control cigarette paper is controlled to be 30g/m2, and the air permeability is controlled to be 60 Kerista, namely the cigarette paper is No. 9.
The physical indexes of cigarettes # 1, # 2, # 3, # 4, # 5 and # 6 prepared in examples 1, 2, 3, 4 and 6 and cigarette papers # 7, # 8 and # 9 prepared in examples 7, 8 and 9 were measured, and the results are shown in table 1:
TABLE 1 physicochemical indices of low air permeability coefficient of variation cigarette paper and control cigarette paper
| Sample numbering | Quantitative (g/m 2) | Permeability (Keleista) | Air permeability coefficient of variation (%) |
| 1# | 31.9 | 49.6 | 3.92 |
| 2# | 28.2 | 60.2 | 4.07 |
| 3# | 30.1 | 59.8 | 4.31 |
| 4# | 30.3 | 60.2 | 3.57 |
| 5# | 29.8 | 59.8 | 3.66 |
| 6# | 30.1 | 59.7 | 4.01 |
| 7# | 32.4 | 50.3 | 6.53 |
| 8# | 28.1 | 59.6 | 5.99 |
| 9# | 30 | 60.6 | 7.11 |
It can be seen that the air permeability coefficient of variation of the cigarette paper is obviously lower, namely the cigarette paper realizes low air permeability coefficient of variation and stable air permeability coefficient of variation of the cigarette paper, and achieves the effect of improving the quality of cigarettes.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (10)
1. The cigarette paper with the low air permeability coefficient of variation is characterized by being prepared from the following components in parts by mass:
65-85 parts of fibers;
0.05-0.15 parts of pulping enzyme;
15-35 parts of a filler;
0.5-8 parts of a combustion improver;
0.5-1.5 parts of hydroxypropyl cellulose;
wherein, the fibre includes first fibre and second fibre, first fibre is softwood pulp fibre and/or jute pulp fibre, the second fibre is hardwood pulp fibre.
2. The rolling paper according to claim 1, wherein the fiber is preferably 70 to 80 parts by mass.
3. The cigarette paper according to claim 1, wherein the beating enzyme is preferably 0.06-0.01 parts by mass.
4. The cigarette paper according to claim 1, wherein the filler comprises calcium carbonate and/or talc, and the filler is preferably 20 to 35 parts by mass.
5. The cigarette paper according to claim 1, wherein the combustion improver comprises one or more of citrate, malate, tartrate, lactate, alginic acid and fumaric acid.
6. The cigarette paper according to claim 1, wherein the combustion improver is preferably 1 to 5 parts by mass.
7. The cigarette paper according to claim 1, wherein the hydroxypropyl cellulose is preferably 0.6 to 1.0 part by mass.
8. A method of making a rolling paper according to any of claims 1 to 7, comprising the steps of:
the first fibers and the second fibers are respectively pumped into a long fiber pulp storage tank and a short fiber pulp storage tank for storage after being disintegrated;
after the pH value and the temperature in the long fiber pulp storage tank are adjusted, the pulping enzyme is added into the long fiber pulp storage tank, is stirred and reacts with the first fiber, and is circularly pulped to obtain a first pulp;
defibering second fibers in the short fiber pulp storage tank by a high-distribution defibering machine to obtain second pulp;
mixing the first slurry, the second slurry and the filler, and then making to obtain mixed slurry;
sequentially carrying out wire section forming, squeezing dehydration, embossing and first drying on the mixed slurry to obtain a first dried paper web;
dissolving the combustion improver and the hydroxypropyl cellulose in water to prepare a mixed solution;
and performing surface sizing on the first dried paper web by using the mixed solution as a sizing agent, and performing secondary drying on the sized first dried paper web to obtain the cigarette paper.
9. The method of producing cigarette paper according to claim 8, wherein the step of adjusting the pH and temperature of the long fiber slurry reservoir specifically comprises:
adjusting the pH value of the long fiber slurry storage tank to be 6-9.5, and adjusting the temperature of the long fiber slurry storage tank to be 22-65 ℃.
10. The preparation method of the cigarette paper according to claim 8, wherein the step of dissolving the combustion improver and the hydroxypropyl cellulose in water to prepare a mixed solution specifically comprises the following steps:
taking a preset water amount according to the mass part of the hydroxypropyl cellulose, and heating 20-30% of the preset water amount to above 60 ℃;
slowly adding hydroxypropyl cellulose into the heated water, fully stirring, adding the rest 80-70% of the preset water after all the hydroxypropyl cellulose is added, and stirring for 30-60 minutes until all the hydroxypropyl cellulose is completely dissolved;
and adding the combustion improver into the hydroxypropyl cellulose dissolving solution, and uniformly stirring for 30 minutes to prepare a mixed solvent.
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