CN110552249A - Production method for improving strength of full hemp cigarette paper - Google Patents
Production method for improving strength of full hemp cigarette paper Download PDFInfo
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- CN110552249A CN110552249A CN201910766554.5A CN201910766554A CN110552249A CN 110552249 A CN110552249 A CN 110552249A CN 201910766554 A CN201910766554 A CN 201910766554A CN 110552249 A CN110552249 A CN 110552249A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/303—Double disc mills
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/06—Sulfite or bisulfite pulp
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/02—Material of vegetable origin
-
- 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
Abstract
The invention provides a production method for improving the strength of full-hemp cigarette paper, which comprises the following steps of (1) stewing, namely uniformly mixing hemp bast and hemp stem core according to a mass ratio of 4: 1, preparing natural-color hemp pulp A by adopting a sulfite method, uniformly mixing the hemp bast and the hemp stem core according to a mass ratio of 3: 7, and preparing natural-color hemp pulp B by adopting a sulfite method, (2) beating, namely continuously beating the hemp pulp A and the hemp pulp B by adopting a double disc mill, uniformly mixing the beaten hemp pulp A fiber and the hemp pulp B fiber, and adding a filler to obtain mixed pulp, (3) diluting the mixed pulp obtained in the step (2), adding an auxiliary agent, sequentially carrying out net part forming and squeezing part dehydration treatment to obtain wet paper sheets, and (4) coating a compound combustion-supporting reagent on the wet paper sheets after pre-drying and drying treatment, and coiling to obtain the full-hemp cigarette paper.
Description
Technical Field
The invention belongs to the technical field of cigarette paper production, and particularly relates to a production method for improving the strength of full-hemp cigarette paper.
Background
The hemp is more suitable for papermaking, the chemical components of hemp are 51.32% of cellulose (50.86% of needle-leaved wood), the yield of paper pulp is high, the content of lignin is 14.97% and the content of needle-leaved wood is 27.85%. The lignin content is low and the cooking is easy. The content of hemp pentosan is 18.29%, which is higher than 11.12% of that of needle wood, and lower than 24.25% of broadleaf wood, 25.56% of wheat straw and 22.46% of reed, and the content of pentosan is moderate, and the hemp pentosan is easy to swell and pulp. Measured by a Shenyang station for monitoring the paper quality of the State Ministry of light industry: the quality of the pulp made of hemp peel is superior to that of needle-leaved wood pulp; core bars are similar to hardwood pulp; the whole stem is equivalent to the mixed pulp of needle and broad leaf. The strength of paper demonstrates that hemp is a promising paper making raw material. And during the planting production period of the hemp fiber, the adaptability is strong, no diseases and insect pests exist, pesticide spraying and fertilizer application are not needed, the hemp fiber is a pure natural green fiber resource, is known as 'king of fiber' and is an excellent fiber raw material of the whole hemp cigarette paper. The full hemp cigarette paper has the advantages of uniform natural pores, softness, fineness, high opacity and good hand feeling, and has the excellent characteristics of improving the quality of smoke panel test aroma, burning grey white, thin carbon lines and the like compared with wood pulp cigarette paper.
CN201110218277 discloses an industrial hemp fiber cigarette paper, which adopts industrial hemp fibers as a main raw material, and the industrial hemp fibers are industrial hemp stalk core fibers or a mixture of the industrial hemp stalk core fibers and the industrial hemp bast fibers. In addition, in the current cigarette paper manufacturing industry, the raw materials of the existing general hemp cigarette paper are general full flax, mixture of flax and Spanish grass pulp or mixture of hemp and flax, and the problems of poor air permeability stability and low strength index of the cigarette paper generally exist.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a production method for improving the strength of the full-hemp cigarette paper. The technical scheme of the invention is as follows:
A production method for improving the strength of the full hemp cigarette paper comprises the following steps:
(1) And (3) cooking: the hemp bast and the hemp stalk core are mixed according to the mass ratio of 4: 1, uniformly mixing, and preparing into natural-color hemp pulp A by a sulfite method;
The hemp bast and the hemp stalk core are mixed according to the mass ratio of 3: 7, uniformly mixing, and preparing into natural-color hemp pulp B by a sulfite method;
(2) Pulping: adopting a double disc mill to continuously pulp the hemp pulp A and the hemp pulp B respectively, uniformly mixing the pulped hemp pulp A fiber and hemp pulp B fiber, and adding a filler to obtain mixed pulp;
(3) Diluting the mixed pulp obtained in the step (2), adding an auxiliary agent, and sequentially carrying out net part forming and press part dehydration treatment until the water content is 60 ~ 68% to obtain a wet paper sheet;
(4) And (3) coating the wet paper after the pre-drying treatment with a compound combustion-supporting reagent, then performing post-drying treatment, and reeling to obtain the paper.
Further, the hemp bast in the step (1) is selected according to the indexes of 12 ~ 25mm of fiber length, 16 mm of average fiber length, 12.39 ~ 24.28.28 mm of fiber width and 18.53 mm of average fiber width, and the hemp stalk core is selected according to the indexes of 0.45 ~ 0.72.72 mm of fiber length, 0.54 mm of average fiber length, 14.51 ~ 27.78.78 mm of fiber width and 19.33mm of average fiber width.
Further, the control parameters of the sulfite method in the step (1) are as follows: the total amount of the cooking liquor accounts for 19-23% of the absolute dry pulp, the ratio of the cooking liquor is 2.0-3.0, the cooking time is 10-15 hours, the pot-placing hardness is 6.0-16.0 KaPPa value, and the black liquor residual alkali is 6-14 g/l.
Further, in the step (1), the hemp pulp A has a D65 brightness of not less than 80%, a dust degree of not more than 25ppm, a fiber length of 1.5-1.8 mm, a fiber thickness of 0.110-0.140 mu g/m, a fiber width of 19.0-24.0 mu m, a fiber torsion degree of 14.0-18.0%, a tear index of 16.0-20.0 mN · m 2/g, an air permeability of 65-110 CU, a beating degree of 46 DEG SR, a wet weight of 10.0-15.0 g, a D65 brightness of not less than 80%, a dust degree of not more than 25ppm, a fiber length of 1.0-1.3 mm, a fiber thickness of 0.110-0.140 mu g/m, a fiber width of 19.0-24.0 mu m, a fiber torsion degree of 14.0-18.0%, a tear index of 10.0-3614.0 mN · m 35/g, a beating degree of 0.160-160 CU, and a wet weight of 5-8 CU.
Further, the control parameters of pulping of the hemp pulp A in the step (2) are that the pulp concentration is 2.8-3.2%, the beating degree/wet weight is 50-80 degrees SR/9.5 ~ 13.5.5 g, the pulping control parameters of the hemp pulp B are that the pulp concentration is 2.8-3.2%, the beating degree/wet weight is 40 ~ 65 degrees SR/1.5 ~ 5.0.0 g, and the hemp pulp A and the hemp pulp B are uniformly mixed according to the weight percentage of 10 ~ 100% and 0 ~ 90% of hemp pulp B.
Further, the filler is calcium carbonate solution with the mass concentration of 16 ~ 20%, wherein the addition amount of the calcium carbonate is (30 ~ 45)% of the mass of the oven dry pulp.
further, the auxiliary agent is selected from one or more of reinforcing agent, retention aid, bactericide and defoaming agent.
furthermore, the compound combustion-supporting reagent is a solution with the mass concentration of (6.0 ~ 15.0)% prepared by a combustion-supporting agent and oxidized starch according to the mass ratio of (1.0 ~ 5.0) to (0.8 ~ 1.5.5), and the addition amount is (2.0 ~ 8.0.0)% of the mass of the oven-dried pulp.
further, the combustion improver is one or more selected from potassium citrate, sodium citrate and potassium malate.
Further, in the step (4), the front drying temperature is 65 ~ 120 ℃, the rear drying temperature is 95 ~ 125 ℃, and the moisture of the dried paper sheet before the paper sheet is discharged is 5.0-7.0%.
Further, the production method also comprises a process of bleaching the hemp pulp A and the hemp pulp B obtained in the step (1) by adopting a bleaching liquor, and the specific control parameters are as follows: the concentration of bleaching pulp is 2.0-10.0%, the dosage of bleaching liquor is 10-30% of oven dry pulp, four-stage bleaching treatment (C-E-M-P) is carried out, wherein the total bleaching treatment time of hemp pulp A is 7 hours, and the total bleaching treatment time of hemp pulp B is 4 hours.
Further, the bleaching liquor is selected from one of sodium hypochlorite, sodium hydroxide, bleaching liquor and water glass.
The invention has the beneficial effects that:
According to the invention, through the deep research on hemp fibers, the bast and the stem core of hemp are mixed according to different proportions to be pulped according to the fiber characteristics of different parts of hemp, so that two hemp pulps with different fiber characteristics are obtained, namely hemp pulp A and hemp pulp B, the two hemp raw materials and the filler are utilized to be made into the full hemp cigarette paper on the original production line, the speed of the production method can reach 240 ~ 300m/min, the production efficiency is high, a series of full hemp cigarette paper with different quantification and different air permeability can be produced, and the full hemp cigarette paper has the characteristics of stable quality, high strength, uniform natural pores, softness, fineness, high opacity and good hand feeling, has the excellent characteristics of improving the quality of smoke evaluation aroma, burning gray white, fine carbon lines and the like compared with wood pulp cigarette paper, and has the advantages of good paper permeability, easy drying, low steam consumption, low power consumption, high production efficiency and low speed.
Detailed Description
In the description of the present invention, it is to be noted that those whose specific conditions are not specified in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturers. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
The embodiment provides a production method for improving the strength of full-hemp cigarette paper, which comprises the following steps:
(1) And (3) cooking: respectively mixing hemp bast and hemp stalk core according to the mass ratio of 4: 1 and 3: 7, mixing and filling the mixture into a pot, preparing the mixture by a sulfite method, wherein the total amount of cooking liquor accounts for 19-23% of absolute dry pulp, the ratio of the cooking liquor is 2.0-3.0, the cooking time is 12 hours, and hemp pulp A and hemp pulp B are respectively obtained, the hardness of the pot is 6.0-16.0 KaPPa, and the residual alkali in black liquor is 6-14 g/l
(2) and (3) washing and grinding, namely washing and grinding for 5-12 h by using a groove type washing and grinding machine, wherein the washing and grinding knocking degree is 35-40 0 SR of hemp pulp A and 14-16 g of washing and grinding wet weight, 35-40 0 SR of hemp pulp B and 7-10 g of washing and grinding wet weight, and then a three-stage deslagging system is used, wherein the first stage is heavy deslagging, and the second and third stages are light deslagging.
(3) pulping, namely continuously pulping the hemp pulp A and the hemp pulp B by adopting a double disc mill, wherein the pulping concentration of the hemp pulp A is (2.8-3.2)%, the pulping degree/wet weight is (80-85) ° SR/(9.5-13.5) g, the pulping concentration of the hemp pulp B is (2.8-3.2)%, the beating degree/wet weight is (60 ~ 65) ° SR/(2.5 ~ 4.0.0) g, mixing the pulped hemp pulp A and hemp pulp B according to the weight ratio of 90% to 10% to obtain mixed pulp, adding a dispersed calcium carbonate solution (the particle size is less than or equal to 3.2 mu m) with the mass concentration of 16% into the mixed pulp, adding the calcium carbonate with the mass of 35% of the absolute dry pulp mass to obtain mixed pulp, and selecting a long mesh paper machine to produce the mixed pulp, wherein the speed is 260 m/min.
(4) Papermaking, namely diluting the mixed pulp to the concentration of 0.6%, respectively adding a guar gum reinforcing agent, a guar gum retention aid, a defoaming agent and a bactericide through a short circulating system to ensure that fibers are uniformly dispersed, performing dehydration treatment on a net part forming and pressing part to obtain a wet paper sheet with the water content of 60 ~ 68%, performing pre-drying treatment (the temperature is 65 ~ 120 ℃) on the wet paper sheet, performing post-drying treatment (the temperature is 95 ~ 125 ℃) on the paper sheet after the pre-drying treatment and the water content of 5.0 ~ 7.0.0% on the paper sheet, coating a solution mixture compounded by a combustion improver and oxidized starch on the paper sheet, and coiling to obtain the natural-color full-hemp paper.
Wherein, the mass concentration of the guar gum reinforcing agent is (0.2 ~ 0.5) percent, the adding amount of the guar gum reinforcing agent in the paper pulp is (0.1 ~ 0.9.9) percent of the total amount of the paper pulp, the mass concentration of the guar gum retention aid is (0.2 ~ 0.5) percent, the adding amount of the guar gum retention aid in the paper pulp is (0.02 ~ 0.10.10) percent of the total amount of the paper pulp, the adding amount of the bactericide in the paper pulp is (0.001 ~ 0.15.15) percent of the total amount of the paper pulp, the antifoaming agent and the water are diluted according to a ratio of 1: 6, the adding amount of the antifoaming agent in the paper pulp is (0.005 ~ 0.50.50) percent of the total amount of the paper pulp, the compound combustion-supporting agent is compounded by the combustion-supporting agent and the oxidized starch according to the mass ratio of 1: 0.8, the mass concentration is 10.0 percent, the adding amount of the combustion-supporting agent is potassium.
the indexes of the hemp cigarette paper in the embodiment are as follows: quantification: 29g per square meter; tensile strength: 1.31 kN/m; elongation of 1.21 percent and tensile energy absorption of 11.26J per square meter; air permeability: 40 CU; whiteness: 89.6 percent; opacity: 76.8 percent; ash content: 20.3 percent.
Example 2
The embodiment provides a production method for improving the strength of the full hemp cigarette paper, which is different from the embodiment 1 in the specific steps that: 1) the pulping hemp pulp A and hemp pulp B are mixed according to the proportion of 80%: mixing 20 percent; 2) the vehicle speed is 300 m/min; 3) the compound combustion-supporting reagent is prepared from a combustion improver and oxidized starch according to a mass ratio of 1: 1, compounding, wherein the mass concentration is 6.0%, the addition amount is 4.0%, and the combustion improver is potassium citrate and sodium citrate according to a mass ratio of 1: 1, compounding.
the indexes of the hemp cigarette paper in the embodiment are as follows: quantification: 29g per square meter; tensile strength: 1.26 kN/m; the elongation is 1.23 percent, and the tensile energy absorption is 10.25J/square meter; air permeability: 50 CU; whiteness: 89.8 percent; opacity: 76.6 percent; ash content: 20.1 percent.
Example 3
The embodiment provides a production method for improving the strength of the full hemp cigarette paper, which is different from the embodiment 1 in the specific steps that: 1) the pulping hemp pulp A and hemp pulp B are mixed according to the proportion of 65%: mixing at 35%; 2) the compound combustion-supporting reagent is prepared from a combustion improver and oxidized starch according to a mass ratio of 2: 0.8, wherein the mass concentration is 6.0%, the addition amount is 6.0%, and the combustion improver is potassium citrate and sodium citrate according to the mass ratio of 7: 3, compounding.
The indexes of the hemp cigarette paper in the embodiment are as follows: quantification: 29g per square meter; tensile strength: 1.21 kN/m; the elongation is 1.20 percent, and the tensile energy absorption is 9.85J per square meter; air permeability: 60 CU; whiteness: 89.6 percent; opacity: 76.4 percent; ash content: 20.8 percent.
Example 4
The embodiment provides a production method for improving the strength of the full hemp cigarette paper, which is different from the embodiment 1 in the specific steps that: 1) 45% of pulped hemp pulp A and hemp pulp B: mixing 55 percent; 2) adding the dispersed calcium carbonate solution (the particle size is less than or equal to 3.2 mu m) with the mass concentration of 18 percent into the mixed pulp, wherein the adding amount of the calcium carbonate is 40 percent of the mass of the oven-dried pulp; 3) the compound combustion-supporting reagent is prepared from a combustion improver and oxidized starch according to a mass ratio of 3: 1, compounding, wherein the mass concentration is 12.0%, the addition amount is 2.0%, and the combustion improver is potassium citrate and sodium citrate according to the mass ratio of 7: 3, compounding.
The indexes of the hemp cigarette paper in the embodiment are as follows: quantification: 29g per square meter; tensile strength: 1.15 kN/m; the elongation is 1.20 percent, and the tensile energy absorption is 8.91J/square meter; air permeability: 70 CU; whiteness: 89.5 percent; opacity: 76.3 percent; ash content: 20.1 percent.
Example 5
The embodiment provides a production method for improving the strength of the full hemp cigarette paper, which is different from the embodiment 1 in the specific steps that: 1) 30% of pulped hemp pulp A and hemp pulp B: mixing 70 percent; 2) the compound combustion-supporting reagent is prepared from a combustion improver and oxidized starch according to a mass ratio of 4: 1, compounding, wherein the mass concentration is 7.0%, the addition amount is 7.0%, and the combustion improver is prepared from potassium citrate, sodium citrate and potassium malate in a mass ratio of 11: 11: 3, compounding.
The indexes of the hemp cigarette paper in the embodiment are as follows: quantification: 29g per square meter; tensile strength: 1.10 kN/m; the elongation is 1.18 percent, and the tensile energy absorption is 8.12J/square meter; air permeability: 80 CU; whiteness: 89.7 percent; opacity: 76.1 percent; ash content: 20.2 percent.
Comparative example 1
The comparative example provides a production method for improving the strength of the full hemp cigarette paper, which comprises the following steps:
(1) And (3) cooking: respectively mixing hemp bast and hemp stalk core according to the mass ratio of 4: 1, mixing and filling in a pot, and preparing by a sulfite method, wherein the total amount of cooking liquor accounts for 19-23% of absolute dry pulp, the ratio of the cooking liquor is 2.0-3.0, the cooking time is 12 hours, the hemp pulp A is obtained, the hardness of the pot is 6.0-16.0 KaPPa, and the residual alkali in black liquor is 6-14 g/l.
(2) and (3) washing and grinding, namely washing and grinding for 5-12 h by using a groove type washing and grinding machine, wherein the washing and grinding knocking degree is 35-40 0 SR of hemp pulp A, the wet weight of the washing and grinding is 14-16 g, and then a three-stage deslagging system is used, wherein the first stage is heavy deslagging, and the second and third stages are light deslagging.
(3) Pulping: the hemp pulp A is continuously beaten by a double disc mill. The pulping concentration of the hemp pulp A fiber is (2.8-3.2)%, the pulping degree/wet weight is (80-85) ° SR/(9.5-13.5) g; adding the dispersed calcium carbonate solution (the particle size is less than or equal to 3.2 mu m) with the mass concentration of 16% into the hemp pulp A to obtain finished pulp; and (4) selecting a fourdrinier machine to produce and manufacture the finished pulp, wherein the speed is 260 m/min.
(4) papermaking, namely diluting the mixed pulp to the concentration of 0.6%, respectively adding a guar gum reinforcing agent, a guar gum retention aid, a defoaming agent and a bactericide through a short circulating system to ensure that fibers are uniformly dispersed, performing dehydration treatment on a net part forming and pressing part to obtain a wet paper sheet with the water content of 60 ~ 68%, performing pre-drying treatment (the temperature is 65 ~ 120 ℃) on the wet paper sheet, performing post-drying treatment (the temperature is 95 ~ 125 ℃) on the paper sheet after the pre-drying treatment and the water content of 5.0 ~ 7.0.0% on the paper sheet, coating a solution mixture compounded by a combustion improver and oxidized starch on the paper sheet, and coiling to obtain the natural-color full-hemp paper.
Wherein, the mass concentration of the guar gum reinforcing agent is (0.2 ~ 0.5) percent, the addition amount of the guar gum reinforcing agent in the paper pulp is (0.1 ~ 0.9.9) percent of the total amount of the paper pulp, the mass concentration of the guar gum retention aid is (0.2 ~ 0.5) percent, the addition amount of the guar gum retention aid in the paper pulp is (0.02 ~ 0.10.10) percent of the total amount of the paper pulp, the addition amount of the bactericide in the paper pulp is (0.001 ~ 0.15.15) percent of the total amount of the paper pulp, the antifoaming agent and the water are diluted according to a ratio of 1: 6, the addition amount of the antifoaming agent in the paper pulp is (0.005 ~ 0.50.50) percent of the total amount of the paper pulp, the compound combustion-supporting agent is compounded by combustion-supporting agent and oxidized starch according to a mass ratio of 1: 0.8, the combustion-supporting agent is potassium citrate and sodium citrate according to a mass ratio of 1: 1.
the indexes of the hemp cigarette paper of the comparative example are as follows: quantification: 29g per square meter; tensile strength: 1.35 kN/m; elongation of 1.30 percent and tensile energy absorption of 11.86J per square meter; air permeability: 50 CU; whiteness: 89.9 percent; opacity: 76.8 percent; ash content: 20.2 percent.
comparative example 2
The comparative example provides a production method for improving the strength of the full hemp cigarette paper, which comprises the following steps:
(1) And (3) cooking: respectively mixing the hemp bast and the hemp stalk core according to the mass ratio of 3: 7, mixing and filling the mixture into a pot, and preparing the mixture by a sulfite method, wherein the total amount of cooking liquor accounts for 19-23% of absolute dry pulp, the ratio of the cooking liquor is 2.0-3.0, the cooking time is 12 hours, the hemp pulp B is obtained, the hardness of the placed pot is 6.0-16.0 KaPPa, and the residual alkali in black liquor is 6-14 g/l.
(2) And (3) washing and grinding, namely washing and grinding for 5-12 h by using a groove type washing and grinding machine, wherein the washing and grinding knocking degree is 35-40 0 SR of hemp pulp B, the wet weight of the washing and grinding is 7-10 g, and then a three-stage deslagging system is used, wherein the first stage is heavy deslagging, and the second and third stages are light deslagging.
(3) And pulping, namely continuously pulping the hemp pulp B by adopting a double-disc mill, wherein the pulping concentration of fibers of the hemp pulp B is 2.8-3.2 percent, the pulping degree/wet weight is 40-65 DEG SR/(1.5 ~ 5.0.0 g), adding a dispersed calcium carbonate solution (the particle size is less than or equal to 3.2 mu m) with the mass concentration of 18 percent into the hemp pulp B to obtain finished pulp, and selecting a fourdrinier machine to produce and manufacture the finished pulp at the speed of 260 m/min.
(4) Papermaking, namely diluting the mixed pulp to the concentration of 0.6%, respectively adding a guar gum reinforcing agent, a guar gum retention aid, a defoaming agent and a bactericide through a short circulating system to ensure that fibers are uniformly dispersed, performing dehydration treatment on a net part forming and pressing part to obtain a wet paper sheet with the water content of 60 ~ 68%, performing pre-drying treatment (the temperature is 65 ~ 120 ℃) on the wet paper sheet, performing post-drying treatment (the temperature is 95 ~ 125 ℃) on the paper sheet after the pre-drying treatment and the water content of 5.0 ~ 7.0.0% on the paper sheet, coating a solution mixture compounded by a combustion improver and oxidized starch on the paper sheet, and coiling to obtain the natural-color full-hemp paper.
Wherein, the mass concentration of the guar gum reinforcing agent is (0.2 ~ 0.5) percent, the addition amount of the guar gum reinforcing agent in the paper pulp is (0.1 ~ 0.9.9) percent of the total amount of the paper pulp, the mass concentration of the guar gum retention aid is (0.2 ~ 0.5) percent, the addition amount of the guar gum retention aid in the paper pulp is (0.02 ~ 0.10.10) percent of the total amount of the paper pulp, the addition amount of the bactericide in the paper pulp is (0.001 ~ 0.15.15) percent of the total amount of the paper pulp, the antifoaming agent and the water are diluted according to a ratio of 1: 6, the addition amount of the antifoaming agent in the paper pulp is (0.005 ~ 0.50.50) percent of the total amount of the paper pulp, the compound combustion-supporting agent is compounded by combustion-supporting agent and oxidized starch according to a mass ratio of 1: 0.8, the addition amount of the antifoaming agent is 10.0 percent, and the combustion-supporting agent is potassium citrate and sodium citrate according to a mass ratio of 1.
The indexes of the hemp cigarette paper of the comparative example are as follows: quantification: 29g per square meter; tensile strength: 0.78 kN/m; the elongation is 1.10 percent, and the tensile energy absorption is 6.25J/square meter; air permeability: 50 CU; whiteness: 89.7 percent; opacity: 76.3 percent; ash content: 20.4 percent.
Comparative example 3
The comparative example provides a production method for improving the strength of the full hemp cigarette paper, which comprises the following steps:
(1) Pulping: continuously pulping the linseed pulp by adopting a double-disc mill. Pulping concentration of the linseed pulp fiber is 2.8-3.2%, and pulping degree/wet weight is 75-85 DEG SR/(8.0-11.5) g, so as to obtain mixed pulp; adding the dispersed calcium carbonate solution (the particle size is less than or equal to 3.2 mu m) with the mass concentration of 16% into the mixed slurry to obtain mixed slurry; and (3) selecting a fourdrinier machine to produce and manufacture the mixed slurry, wherein the speed is 260 m/min.
(2) Papermaking, namely diluting the mixed pulp to the concentration of 0.6%, respectively adding a guar gum reinforcing agent, a guar gum retention aid, a defoaming agent and a bactericide through a short circulating system to ensure that fibers are uniformly dispersed, performing dehydration treatment on a net part forming and pressing part to obtain a wet paper sheet with the water content of 60 ~ 68%, performing pre-drying treatment (the temperature is 65 ~ 120 ℃) on the wet paper sheet, performing post-drying treatment (the temperature is 95 ~ 125 ℃) on the paper sheet after the pre-drying treatment and the water content of 5.0 ~ 7.0.0% on the paper sheet, coating a solution mixture compounded by a combustion improver and oxidized starch on the paper sheet, and coiling to obtain the natural-color full-hemp paper.
Wherein, the mass concentration of the guar gum reinforcing agent is (0.2 ~ 0.5) percent, the addition amount of the guar gum reinforcing agent in the paper pulp is (0.1 ~ 0.9.9) percent of the total amount of the paper pulp, the mass concentration of the guar gum retention aid is (0.2 ~ 0.5) percent, the addition amount of the guar gum retention aid in the paper pulp is (0.02 ~ 0.10.10) percent of the total amount of the paper pulp, the addition amount of the bactericide in the paper pulp is (0.001 ~ 0.15.15) percent of the total amount of the paper pulp, the antifoaming agent and the water are diluted according to a ratio of 1: 6, the addition amount of the antifoaming agent in the paper pulp is (0.005 ~ 0.50.50) percent of the total amount of the paper pulp, the compound combustion-supporting agent is compounded by combustion-supporting agent and oxidized starch according to a mass ratio of 1: 0.8, the mass concentration is 10.0 percent, the addition amount is 6.0 percent, and the combustion-supporting agent is potassium citrate and sodium citrate according to a.
The indexes of the hemp cigarette paper of the comparative example are as follows: quantification: 29g per square meter; tensile strength: 0.92 kN/m; the elongation is 1.16 percent, and the tensile energy absorption is 7.12J/square meter; air permeability: 50 CU; whiteness: 89.1 percent; opacity: 75.1 percent; ash content: 20.1 percent.
Comparative example 4
The comparative example provides a production method for improving the strength of the full hemp cigarette paper, which comprises the following steps:
(1) Pulping: the needle leaf pulp and the broad leaf pulp are respectively and continuously pulped by adopting a double disc grinder. The pulping concentration of the softwood pulp fibers is 3.8-4.2 percent, and the pulping degree/wet weight is 85-90 DEG SR/(8.0-10.5) g; pulping concentration of broad leaf pulp fiber (3.8-4.2)%, pulping degree/wet weight (40-44) ° SR/(1.5-3.5) g to obtain mixed pulp; adding the dispersed filler (the particle size is less than or equal to 3.2 mu m) into the mixed pulp to obtain mixed pulp, and selecting a fourdrinier machine to produce and manufacture the mixed pulp at the speed of 260 m/min.
(2) Papermaking, namely diluting the mixed pulp to the concentration of 0.6%, respectively adding a guar gum reinforcing agent, a guar gum retention aid, a defoaming agent and a bactericide through a short circulating system to ensure that fibers are uniformly dispersed, performing dehydration treatment on a net part forming and pressing part to obtain a wet paper sheet with the water content of 60 ~ 68%, performing pre-drying treatment (the temperature is 65 ~ 120 ℃) on the wet paper sheet, performing post-drying treatment (the temperature is 95 ~ 125 ℃) on the paper sheet after the pre-drying treatment and the water content of 5.0 ~ 7.0.0% on the paper sheet, coating a solution mixture compounded by a combustion improver and oxidized starch on the paper sheet, and coiling to obtain the natural-color full-hemp paper.
Wherein, the mass concentration of the guar gum reinforcing agent is (0.2 ~ 0.5) percent, the addition amount of the guar gum reinforcing agent in the paper pulp is (0.1 ~ 0.9.9) percent of the total amount of the paper pulp, the mass concentration of the guar gum retention aid is (0.2 ~ 0.5) percent, the addition amount of the guar gum retention aid in the paper pulp is (0.02 ~ 0.10.10) percent of the total amount of the paper pulp, the addition amount of the bactericide in the paper pulp is (0.001 ~ 0.15.15) percent of the total amount of the paper pulp, the antifoaming agent and the water are diluted according to a ratio of 1: 6, the addition amount of the antifoaming agent in the paper pulp is (0.005 ~ 0.50.50) percent of the total amount of the paper pulp, the compound combustion-supporting agent is compounded by combustion-supporting agent and oxidized starch according to a mass ratio of 1: 0.8, the addition amount of the combustion-supporting agent is potassium citrate and sodium citrate according to a mass ratio of 1: 1.
The indexes of the hemp cigarette paper of the comparative example are as follows: quantification: 29g per square meter; tensile strength: 1.08 kN/m; the elongation is 1.20 percent, and the tensile energy absorption is 8.75J per square meter; air permeability: 50 CU; whiteness: 89.4 percent; opacity: 73.6 percent; ash content: 20.3 percent.
And (4) conclusion: the data in table 1 show that the hemp pulp A and the hemp pulp B are used in cooperation in the actual production process of the full-hemp cigarette paper, so that the air permeability of the finished paper is optimized while the strength of the finished paper is improved, and the obtained cigarette paper has stable quality and high strength index.
TABLE 1 comparison of index results for examples and comparative examples
in addition, through the comparison of the cigarettes and the combustion of the embodiment and the comparative example, the cigarette paper produced by the hemp is high in opacity, the cigarette is more attractive, the combustion grey is white, the carbon lines are thin, and compared with wood pulp cigarette paper, the quality of the smoke panel test aroma is improved.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A production method for improving the strength of the full hemp cigarette paper is characterized by comprising the following steps:
(1) And (3) cooking: the hemp bast and the hemp stalk core are mixed according to the mass ratio of 4: 1, uniformly mixing, and preparing into natural-color hemp pulp A by a sulfite method;
The hemp bast and the hemp stalk core are mixed according to the mass ratio of 3: 7, uniformly mixing, and preparing into natural-color hemp pulp B by a sulfite method;
(2) pulping: adopting a double disc mill to continuously pulp the hemp pulp A and the hemp pulp B respectively, uniformly mixing the pulped hemp pulp A fiber and hemp pulp B fiber, and adding a filler to obtain mixed pulp;
(3) Diluting the mixed pulp obtained in the step (2), adding an auxiliary agent, and sequentially carrying out net part forming and press part dehydration treatment until the water content is 60 ~ 68% to obtain a wet paper sheet;
(4) And (3) coating the wet paper after the pre-drying treatment with a compound combustion-supporting reagent, then performing post-drying treatment, and reeling to obtain the paper.
2. The production method for improving the strength of the full-hemp cigarette paper is characterized in that in the step (1), the hemp bast is selected according to the selection indexes of 12 ~ 25mm in fiber length, 16 mm in average fiber length, 12.39 ~ 24.28.28 mm in fiber width and 18.53 mm in average fiber width, and the hemp stalk core is selected according to the selection indexes of 0.45 ~ 0.72.72 mm in fiber length, 0.54 mm in average fiber length, 14.51 ~ 27.78.78 mm in fiber width and 19.33mm in average fiber width.
3. The production method for improving the strength of the full-hemp cigarette paper according to claim 1, wherein the control parameters of the sulfite method in the step (1) are as follows: the total amount of the cooking liquor accounts for 19-23% of the absolute dry pulp, the ratio of the cooking liquor is 2.0-3.0, the cooking time is 10-15 hours, the pot-placing hardness is 6.0-16.0 KaPPa value, and the black liquor residual alkali is 6-14 g/l.
4. the production method for improving the strength of the whole hemp cigarette paper according to any one of claims 1 ~, wherein in the step (1), the hemp pulp A has a D65 brightness of not less than 80%, a dust degree of not more than 25ppm, a fiber length of 1.5 to 1.8mm, a fiber thickness of 0.110 to 0.140 μ g/m, a fiber width of 19.0 to 24.0 μm, a fiber torsion degree of 14.0 to 18.0%, a tear index of 16.0 to 20.0 mN.m 2/g, an air permeability of 65 to 110CU, a beating degree of 46 ° SR, a wet weight of 10.0 to 15.0g, the hemp pulp B has a D65 brightness of not less than 80%, a dust degree of not more than 25ppm, a fiber length of 1.0 to 1.3 mm, a fiber thickness of 0.110 to 0.140 μ g/m, a fiber width of 19.0 to 24.0 μm, a fiber torsion degree of 14.0, a tear index of 0.0.260 to 0.260% and a tear index of 0.2.44 to 2 CU.
5. The production method for improving the strength of the full-hemp cigarette paper according to claim 1, wherein the pulping parameters of the hemp pulp A in the step (2) are that the pulp concentration is 2.8-3.2%, the beating degree/wet weight is 50-80 degrees SR/9.5 ~ 13.5.5 g, the pulping parameters of the hemp pulp B are that the pulp concentration is 2.8-3.2%, the beating degree/wet weight is 40 ~ 65 degrees SR/1.5 ~ 5.0.0 g, and the hemp pulp A and the hemp pulp B are uniformly mixed according to the weight percentage of 10 ~ 100% of hemp pulp A and 0 ~ 90% of hemp pulp B.
6. The production method for improving the strength of the full-hemp cigarette paper according to claim 1, wherein the filler is calcium carbonate solution with the mass concentration of 16 ~ 20%, and the addition amount of the calcium carbonate is (30 ~ 45)% of the mass of the oven-dried pulp.
7. The production method for improving the strength of the full-hemp cigarette paper according to claim 1, wherein the compound combustion-supporting reagent is a solution with the mass concentration of (6.0 ~ 15.0.0)% prepared from a combustion-supporting agent and oxidized starch according to the mass ratio of (1.0 ~ 5.0.0) to (0.8 ~ 1.5.5), and the addition amount is (2.0 ~ 8.0.0)% of the mass of absolute dry pulp.
8. the production method for improving the strength of the full-hemp cigarette paper according to claim 7, wherein the combustion improver is one or more selected from potassium citrate, sodium citrate and potassium malate.
9. The production method for improving the strength of the full-hemp cigarette paper according to claim 1, characterized in that the production method further comprises a process of bleaching the hemp pulp A and the hemp pulp B obtained in the step (1) by using a bleaching solution, and the specific control parameters are as follows: the concentration of bleaching pulp is 2.0-10.0%, the dosage of bleaching liquor is 10-30% of oven dry pulp, four-stage bleaching treatment (C-E-M-P) is carried out, wherein the total bleaching treatment time of hemp pulp A is 7 hours, and the total bleaching treatment time of hemp pulp B is 4 hours.
10. The production method for improving the strength of the full-hemp cigarette paper according to claim 9, wherein the bleaching solution is selected from one of sodium hypochlorite, sodium hydroxide, bleaching solution and water glass.
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Application publication date: 20191210 |