Production method of high-glossiness tipping base paper for cigarettes

Abstract

The invention provides a production method of high-glossiness tipping base paper for cigarettes, which comprises the following steps: step 1, pulping: selecting an appropriate coniferous and hardwood pulp variety, and mixing and pulping coniferous pulp and hardwood pulp; step 2, preparing pulp: adding cationic starch into the beaten pulp; step 3, sizing in the pulp: adding a sizing agent into the pulp to adjust and control the water absorption of the paper; step 4, manufacturing and molding, namely diluting the sizing agent after sizing and then carrying out calendering treatment; step 5, prime coating: carrying out prime coating treatment on the produced tipping base paper for the cigarettes; step 6, top coating: carrying out top coating treatment on the surface of the paper subjected to bottom coating and primary baking; 7, back application, state adjustment and calendering are conducted, and the high-glossiness tipping base paper for the cigarettes is obtained. The emulsion is prepared to form a film on the base paper, so that the glossiness of the tipping base paper for the cigarettes is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cigarette tipping base paper production, in particular to a method for producing high-gloss cigarette tipping base paper. Background Art

[0002] Ordinary cigarette tipping paper is generally dull or low in glossiness. In order to improve the decorative effect of cigarette tipping paper and give it a stronger printing gloss, traditional cigarette factories will plate a layer of aluminum on the cigarette tipping paper through vacuum aluminizing or transfer aluminizing, so as to improve the glossiness of cigarette tipping paper. The vacuum aluminizing method mainly places the cigarette tipping paper on a vacuum aluminizing machine, first applies a primer on the surface of the paper, then vacuum aluminizes, and then top coats. The surface of the cigarette tipping paper produced by this process is rough and porous, with poor flatness, and the glossiness of the aluminized layer is not high; the transfer aluminizing method mainly involves first coating the surface of the PET film, then placing the PET film on a vacuum aluminizing machine to form an aluminized layer, applying glue on the aluminized layer, and then compounding it with the cigarette tipping paper, and then peeling off the PET film after compounding. A bright aluminized layer is formed on the surface of the cigarette tipping paper, which is used to improve the glossiness of the cigarette tipping paper and the flatness is also good. However, this method has a long production process and high material consumption. In addition, due to the aluminum plating process, there are excessive VOC emissions and high heavy metal content, which is not conducive to environmental protection or human health. With the growing call for healthy and environmentally friendly cigarettes, the third generation of transfer-type high-gloss cigarette tipping paper has emerged. It is mainly through replacing the aluminum plating layer with a polymer water-based emulsion, applying the polymer water-based emulsion on the PET film, and before the emulsion dries, the PET film and the cigarette tipping base paper are laminated under a certain pressure. After a certain period of aging, it is naturally dried and solidified, and then the PET film is peeled off. The gloss effect of cigarette tipping paper is improved by the polymer water-based emulsion. This process has low VOC emissions, because there is no aluminum layer to ensure that the paper surface does not contain heavy metals, thus promoting the development of high-gloss cigarette tipping paper. However, this process is complicated in production process because it is transferred through the PET film. On the other hand, the PET film can only be used once, and the large-scale use of PET film increases production costs, causing unnecessary waste. Summary of the invention

[0003] The object of the present invention is to provide a method for producing high-gloss cigarette tipping paper, which improves the gloss of the cigarette tipping paper by forming a film of emulsion on the base paper, thereby eliminating the subsequent transfer process of PET film. The high-gloss cigarette tipping paper after coating can be directly used for printing, which reduces the use of PET film while reducing the transfer process and improving work efficiency.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for producing high-gloss cigarette tipping paper comprises the following steps:

[0006] Step 1: Pulping: Select appropriate coniferous and broadleaf wood pulp varieties, mix and beat coniferous pulp and broadleaf pulp, with the proportion of coniferous pulp being 15-25%;

[0007] Step 2: slurry preparation: add cationic starch to the beaten slurry and gelatinize it at 95°C. The amount of cationic starch added is 10-15kg / ton slurry.

[0008] Step 3: Sizing in pulp: Add sizing agent in the pulp to adjust and control the water absorption of paper. The amount of sizing agent added is 15-20kg / ton pulp.

[0009] Step 4: Papermaking: dilute the sizing slurry to a slurry concentration of 0.45-0.6%, then form the paper sheets, dehydrate and dry them, and then calender them;

[0010] Step 5: Primer: Prime the produced cigarette tipping paper with a barrier material and a glue amount of 2-3g / m 2 , after primer coating, initial baking is carried out at a temperature of 60-80°C to quickly remove moisture;

[0011] Step 6: Topcoating: Topcoating is performed on the paper surface after primer coating and initial baking. The topcoating latex is a water-based high-gloss material with a glue amount of 1.5-2.5g / m 2 , the drying temperature is 90-110℃, to adapt to the drying speed of 90m / min;

[0012] Step 7, back coating, conditioning and calendering: The paper after surface coating is treated with back coating, then conditioned, and then calendered by a calender to obtain high-gloss cigarette tipping base paper.

[0013] Preferably, the primer coating formula in step 5 comprises, by weight percentage:

[0014] Filler: 20-25%;

[0015] Water-based adhesive: 15-20%;

[0016] Solvent system: 50-55%, of which deionized water accounts for 45-50% and ethanol accounts for 5-10%;

[0017] Drying agent: 1-2%;

[0018] Surfactant: 0.5-1%.

[0019] Preferably, the coating formulation in step six comprises, by weight percentage:

[0020] Brightener: 5-10%;

[0021] Waterborne polymer: 25-30%;

[0022] Solvent system: 50-60%, of which deionized water accounts for 50-55% and ethanol accounts for 10-15%;

[0023] Drying agent: 1-2%;

[0024] Tackifier: 3-5%.

[0025] Preferably, in step one, a constant volume and constant pressure pulping device is used, and through a circulating pulping and feeding method, part of the pulp in the conveying pipeline after the disc mill pulping and beating is returned to the disc mill inlet through a reflux device, so that part of the fibers are re-fiberized.

[0026] Preferably, the paper dryness after drying in step 4 is controlled between 94-97%, and then calendering treatment is performed to improve the smoothness and compactness of the paper.

[0027] Preferably, the back coating treatment in step seven uses water as the back coating material to balance the difference between the two sides of the paper due to the increase in the coating amount on one side.

[0028] Preferably, the calendering treatment in step seven uses a calender to calender the paper to improve the surface smoothness and glossiness of the paper.

[0029] Preferably, the produced high gloss cigarette tipping paper has a basis weight of 40±1 g / m 2 , tensile strength (longitudinal) ≥2.0KN / m, tear strength (transverse) ≥150mN, smoothness (glossy surface) ≥2000s, 75° gloss (glossy surface) ≥30%.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a method for producing high-gloss cigarette tipping paper, which obtains a high gloss after preparing an emulsion and forming a film on the base paper, thereby improving the gloss of the cigarette tipping paper. The high-gloss cigarette tipping paper after coating can be directly used for printing, which not only reduces the production cost but also improves the work efficiency. The high gloss produced, and the prepared cigarette tipping paper has a basis weight of 40±1g / m 2 , tensile strength (longitudinal) ≥2.0KN / m, tear strength (transverse) ≥150mN, smoothness (glossy) ≥2000s, 75° gloss (glossy) ≥30%, which makes it perform well in terms of quantity, tensile strength, tear strength, etc., can meet the needs of high-end cigarette packaging, and improve the overall quality and visual effect of cigarettes.

[0032] The present invention abandons the traditional aluminum plating and PET film transfer process, directly coats the base paper with a polymer water-based emulsion, reduces the production process, reduces the consumption of materials such as PET film, improves production efficiency, and effectively reduces production costs. The aluminum plating process is avoided, eliminating VOC emissions and heavy metal pollution problems; the use of polymer water-based emulsion further reduces VOC emissions, which is in line with the development trend of healthy and environmentally friendly cigarettes.

[0033] The present invention adopts the synergistic drying of the primer and the topcoat: the volatile solvent in the primer formula can accelerate the drying of the primer layer, thereby creating a drier and smoother surface for the topcoat, which is crucial to improving the drying efficiency and avoiding paper curling; the thermal conductivity of the primer and the topcoat is coordinated and consistent, and a reasonable ratio in terms of solid content, viscosity, etc. is used to ensure that the two can synergize with each other to improve the drying efficiency. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] The present invention provides a method for producing high-gloss cigarette tipping paper, comprising the following steps:

[0036] Step 1: Pulping: Select appropriate coniferous and broadleaf wood pulp varieties, mix and beat coniferous pulp and broadleaf pulp, with the proportion of coniferous pulp being 15-25%;

[0037] During pulping, a constant volume and constant pressure pulping device is used. Through the method of circulating pulping and feeding, part of the pulp in the conveying pipeline after the disc grinding is returned to the disc grinding inlet through the reflux device, so that part of the fibers are secondary broomed. By keeping the pulp conveying flow rate and the pressure in the grinding area constant; the pulp is beaten to a beating degree of 70-75°SR. After pulping, the retention of pulp fiber length and sufficient fibrillation can effectively increase the bonding strength of the finished paper; select fillers with high covering power such as light calcium for filling, and the filling amount is 23%-25%.

[0038] Step 2, slurry preparation: add the beaten slurry into the slurry preparation tank, add cationic starch into the slurry preparation tank, and gelatinize at 95°C. The amount of cationic starch added is 10-15kg / ton slurry (absolute dry weight).

[0039] Step 3: Sizing in pulp: Add sizing agent in the pulp to adjust and control the water absorption of paper. The amount of sizing agent added is 15-20kg / ton pulp (absolute dry weight);

[0040] Step 4: Papermaking: Dilute the slurry after sizing to a concentration of 0.45-0.6% for papermaking; then use a fourdrinier former to form the paper sheets, and after forming, use dehydration by squeezing to remove moisture from the wet paper. Finally, use drying to remove moisture that is not removed by squeezing, so that the paper dryness is between 94-97%, and then perform calendering to improve the smoothness and tightness of the paper in preparation for subsequent coating.

[0041] Step 5: Primer: Place the cigarette tipping paper produced by the paper machine on the coating machine for primer treatment. The primer coating is a barrier material with a glue amount of 2-3g / m 2 , after primer coating, initial baking is carried out at a temperature of 60-80°C to quickly remove moisture;

[0042] Among them, the primer coating formula includes, by weight percentage: filler (light calcium, nano-silicon dioxide): 20-25%, water-based adhesive (modified starch, polyvinyl alcohol): 15-20%, solvent system: 50-55% (of which deionized water accounts for 45-50%, ethanol accounts for 5-10%), drying agent: 1-2%, surfactant: 0.5-1%.

[0043] Step 6: Top coating: top coating the paper surface after primer coating and initial baking;

[0044] First, the primer is dried at a relatively low temperature (60-80°C) to quickly remove moisture and increase the evaporation rate of volatile solvents. Then, the primer-coated paper is dried and then top-coated to improve the gloss and smoothness of the paper surface to meet the surface performance requirements of subsequent printing on the paper.

[0045] The latex applied on the top is a water-based high-gloss material with a glue application amount of 1.5-2.5g / m 2 , the drying temperature is 90-110℃, which is suitable for drying at a speed of 90m / min to remove moisture and further fix the surface coating;

[0046] Among them, the top coating formula: brightener (such as nano titanium dioxide, nano silicon): 5-10%, water-based polymer (such as water-based polyurethane, acrylic acid): 25-30%, solvent system: 50-60% (of which deionized water accounts for 50-55%, ethanol accounts for 10-15%), drying agent: 1-2%, viscosity enhancer (such as polyvinyl alcohol): 3-5%.

[0047] Step 7, back coating, conditioning and calendering: The paper after surface coating is treated with back coating, then conditioned, and then calendered by a calender to obtain high-gloss cigarette tipping base paper.

[0048] Because the paper that has been primed and top-coated has an increased amount of coating on one side, it may flanging or curling after drying. In order to balance the difference between the two sides, the paper is back-coated with water after top-coating, and there will be no flanging or curling after conditioning treatment.

[0049] The calendering treatment can improve the surface smoothness of paper on the one hand, and further improve the surface gloss of paper on the other hand; high-gloss cigarette tipping paper can be obtained by winding the paper out of the calender.

[0050] Embodiment 1:

[0051] According to the method steps of the present application, softwood and hardwood are pulped, the proportion of softwood pulp is 20%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0052] In step 1, the imported pulp is beaten to a beating degree of 70°SR and a filling amount of 23% is added;

[0053] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0054] Step 3: Add sizing agent into the pulp, the amount of sizing agent added is 15kg / ton pulp (absolute dry weight);

[0055] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0056] In step 5, the amount of latex applied to the base coat is 2g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0057] Step 6: The amount of latex applied on the surface is 1.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0058] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0059] The basis weight of the high gloss cigarette tipping paper produced based on this application is 39.9g / m 2, tensile strength (longitudinal) 2.6KN / m; tear strength (transverse) 180mN; smoothness (glossy surface) 2319.3s; 75° glossiness (glossy surface) 32.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0060] Embodiment 2:

[0061] According to the method steps of the present application, softwood and hardwood are pulped, the proportion of softwood pulp is 15%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0062] In step 1, the imported pulp is beaten to a beating degree of 70°SR and a filling amount of 23% is added;

[0063] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0064] Step 3: Add sizing agent into the pulp, the amount of sizing agent added is 15kg / ton pulp (absolute dry weight);

[0065] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0066] In step 5, the amount of latex applied to the base coat is 2g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0067] Step 6: The amount of latex applied on the surface is 1.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0068] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0069] The basis weight of the high gloss cigarette tipping paper produced based on this application is 39.9g / m 2, tensile strength (longitudinal) 2.6KN / m; tear strength (transverse) 180mN; smoothness (glossy surface) 2319.3s; 75° glossiness (glossy surface) 32.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0070] Embodiment 3:

[0071] According to the method steps of pulping coniferous wood and broadleaf wood of the present application, the proportion of coniferous wood is 20%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0072] In step 1, the imported pulp is beaten to a beating degree of 75oSR and a filling amount of 25% is added;

[0073] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0074] In step 3, the amount of AKD added is 20 kg / ton of pulp (absolute dry weight);

[0075] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0076] In step 5, the amount of latex applied to the base coat is 2g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0077] Step 6: The amount of latex applied on the surface is 2g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0078] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0079] The basis weight of the high gloss cigarette tipping paper produced based on this application is 40.9g / m 2, tensile strength (longitudinal) 2.7KN / m; tear strength (transverse) 190mN; smoothness (glossy surface) 2620s; 75° glossiness (glossy surface) 42.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0080] Embodiment 4:

[0081] According to the method steps of beating softwood and hardwood in the present application, with the proportion of softwood pulp being 25%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0082] In step 1, the imported pulp is beaten to a beating degree of 75oSR and a filling amount of 25% is added;

[0083] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0084] In step 3, the amount of AKD added is 20 kg / ton of pulp (absolute dry weight);

[0085] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0086] In step 5, the amount of latex applied to the base coat is 3g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0087] Step 6: The amount of latex applied on the surface is 2.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0088] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0089] The basis weight of the high gloss cigarette tipping paper produced based on this application is 41.0g / m 2, tensile strength (longitudinal) 2.7KN / m; tear strength (transverse) 187mN; smoothness (glossy surface) 3670.5s; 75° glossiness (glossy surface) 45.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0090] Embodiment 5:

[0091] According to the method steps of the present application, softwood and hardwood are pulped, the proportion of softwood pulp is 20%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0092] In step 1, the imported pulp is beaten to a beating degree of 70oSR and a filling amount of 23% is added;

[0093] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0094] Step 3: Add sizing agent into the pulp, the amount of sizing agent added is 15kg / ton pulp (absolute dry weight);

[0095] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0096] In step 5, the amount of latex applied to the base coat is 2g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0097] Step 6: The amount of latex applied on the surface is 1.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0098] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0099] The basis weight of the high gloss cigarette tipping paper produced based on this application is 39.9g / m 2, tensile strength (longitudinal) 2.6KN / m; tear strength (transverse) 180mN; smoothness (glossy surface) 2319.3s; 75° glossiness (glossy surface) 32.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0100] Embodiment 6:

[0101] According to the method steps of the present application, softwood and hardwood are pulped, with the proportion of softwood pulp being 22%, pulping, internal sizing, papermaking, base coating, surface coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping paper is prepared.

[0102] The key parameters are as follows:

[0103] In step 1, the imported pulp is beaten to a beating degree of 73oSR and a filling amount of 24% is added;

[0104] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 13kg / ton slurry (absolute dry weight);

[0105] Step 3: Add sizing agent into the pulp, the amount of sizing agent added is 17kg / ton pulp (absolute dry weight);

[0106] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0107] In step 5, the amount of latex applied to the base coat is 2.5 g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0108] Step 6: The amount of latex applied on the surface is 2.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0109] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0110] The basis weight of the high gloss cigarette tipping paper produced based on this application is 39.9g / m 2, tensile strength (longitudinal) 2.6KN / m; tear strength (transverse) 180mN; smoothness (glossy surface) 2319.3s; 75° glossiness (glossy surface) 32.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0111] Embodiment 7:

[0112] According to the method steps of the present application, softwood and hardwood are pulped, the proportion of softwood pulp is 15%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0113] In step 1, the imported pulp is beaten to a beating degree of 70oSR and a filling amount of 23% is added;

[0114] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0115] Step 3: Add sizing agent into the pulp, the amount of sizing agent added is 15kg / ton pulp (absolute dry weight);

[0116] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0117] In step 5, the amount of latex applied to the base coat is 2g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0118] Step 6: The amount of latex applied on the surface is 1.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0119] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0120] The basis weight of the high gloss cigarette tipping paper produced based on this application is 39.9g / m 2, tensile strength (longitudinal) 2.6KN / m; tear strength (transverse) 180mN; smoothness (glossy surface) 2319.3s; 75° glossiness (glossy surface) 32.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0121] Embodiment 8:

[0122] According to the method steps of the present application, softwood and hardwood are pulped, the proportion of softwood pulp is 15%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0123] In step 1, the imported pulp is beaten to a beating degree of 70oSR and a filling amount of 23% is added;

[0124] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0125] Step 3: Add sizing agent into the pulp, the amount of sizing agent added is 15kg / ton pulp (absolute dry weight);

[0126] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0127] In step 5, the amount of latex applied to the base coat is 2g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0128] Step 6: The amount of latex applied on the surface is 1.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0129] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0130] The basis weight of the high gloss cigarette tipping paper produced based on this application is 39.9g / m 2, tensile strength (longitudinal) 2.6KN / m; tear strength (transverse) 180mN; smoothness (glossy surface) 2319.3s; 75° glossiness (glossy surface) 32.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0131] Embodiment 9:

[0132] According to the method steps of the present application, softwood and hardwood are pulped, the proportion of softwood pulp is 15%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0133] In step 1, the imported pulp is beaten to a beating degree of 70oSR and a filling amount of 23% is added;

[0134] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0135] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0136] Step 3: Add sizing agent into the pulp, the amount of sizing agent added is 15kg / ton pulp (absolute dry weight);

[0137] In step 5, the amount of latex applied to the base coat is 2g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0138] Step 6: The amount of latex applied on the surface is 1.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0139] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0140] The basis weight of the high gloss cigarette tipping paper produced based on this application is 39.9g / m 2, tensile strength (longitudinal) 2.6KN / m; tear strength (transverse) 180mN; smoothness (glossy surface) 2319.3s; 75° glossiness (glossy surface) 32.0%. The high-gloss cigarette tipping paper produced based on this application meets the basic requirements of high-gloss cigarette tipping paper in terms of quantitative, tensile strength, smoothness, tear strength and other indicators, and has the characteristics of high gloss.

[0141] Embodiment 10:

[0142] According to the method steps of beating softwood and hardwood in the present application, with the proportion of softwood pulp being 25%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0143] In step 1, the imported pulp is beaten to a beating degree of 75°SR and a filling amount of 25% is added;

[0144] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0145] In step 3, the amount of AKD added is 20 kg / ton of pulp (absolute dry weight);

[0146] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0147] In step 5, the amount of latex applied to the base coat is 3g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0148] Step 6: The amount of latex applied on the surface is 2.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0149] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0150] The high gloss cigarette tipping paper produced based on this application has a basis weight of 41.0g / m2, a tensile strength (longitudinal) of 2.7KN / m, a tear strength (transverse) of 187mN, a smoothness (glossy surface) of 3670.5s, and a 75° glossiness (glossy surface) of 45.0%. The high gloss cigarette tipping paper produced based on this application meets the basic requirements of high gloss cigarette tipping paper in terms of the indicators such as basis weight, tensile strength, smoothness, and tear strength, and has the characteristics of high glossiness.

[0151] Embodiment 11:

[0152] According to the method steps of beating softwood and hardwood in the present application, with the proportion of softwood pulp being 25%, pulping, internal sizing, papermaking, primer coating, top coating, back coating, conditioning, and calendering, a high-gloss cigarette tipping base paper is prepared. The key parameters are as follows:

[0153] In step 1, the imported pulp is beaten to a beating degree of 75oSR and a filling amount of 25% is added;

[0154] Step 2: Add the cooked cationic starch to the beaten slurry, with the addition amount of 15kg / ton slurry (absolute dry weight);

[0155] In step 3, the amount of AKD added is 20 kg / ton of pulp (absolute dry weight);

[0156] Step 4: dilute the sizing slurry to a slurry concentration of 0.5% for papermaking, so that the paper dryness is between 95%;

[0157] In step 5, the amount of latex applied to the base coat is 3g / m 2 ; Among them, the preparation ratio of the primer latex is: 25% light calcium, 15% modified starch, 50% solvent system (50% deionized water, 5% ethanol), 1.5% drying agent, 0.5% surfactant; the primer is initially baked at 70°C;

[0158] Step 6: The amount of latex applied on the surface is 2.5g / m 2 ; Among them, the proportion of the surface coating latex is: 10% nano titanium dioxide, 30% water-based polyurethane, solvent system: 55% (50% deionized water, 15% ethanol), drying agent: 1.5%, polyvinyl alcohol 3%; the surface coating is dried at 105°C;

[0159] Step 7: The paper after the surface coating is subjected to back coating treatment, and then to conditioning treatment, and then to calendering treatment by a calender to obtain high-gloss cigarette tipping base paper.

[0160] The high gloss cigarette tipping paper produced based on this application has a basis weight of 41.0g / m2, a tensile strength (longitudinal) of 2.7KN / m, a tear strength (transverse) of 187mN, a smoothness (glossy surface) of 3670.5s, and a 75° glossiness (glossy surface) of 45.0%. The high gloss cigarette tipping paper produced based on this application meets the basic requirements of high gloss cigarette tipping paper in terms of the indicators such as basis weight, tensile strength, smoothness, and tear strength, and has the characteristics of high glossiness.

[0161] In the above embodiments, the gluing is performed by primer and topcoat. The primer is mainly responsible for anti-penetration and barrier functions, while the topcoat focuses on gloss and smoothness. By matching the performance of the primer and topcoat, the topcoat can achieve the best effect.

[0162] Among them, the drying of primer and topcoat is coordinated:

[0163] Thin coats and volatile solvents in primers: Volatile solvents in primer formulations accelerate the drying of the primer, creating a drier, smoother surface for the topcoat to be applied. This is critical for increased drying efficiency and to avoid paper curling.

[0164] Among them, the thermal balance and thermal conductivity of the primer and topcoat:

[0165] The thermal conductivity of the primer and the topcoat is coordinated. If the topcoat is too thick or the solid content is too high, the drying speed of the primer may be affected. Therefore, the primer and the topcoat of the present invention are reasonably proportioned in terms of solid content, viscosity, etc., to ensure that the two can cooperate with each other to improve the drying efficiency.

[0166] The process of the present invention adopts the method of mixing coniferous pulp and broadleaf pulp with starch, and then adds a sizing agent to prepare an emulsion to form a film on the cigarette tipping paper, thereby improving the glossiness of the cigarette tipping paper and eliminating the subsequent PET film transfer process.

[0167] The present invention carefully selects coniferous and broadleaf wood pulp, strictly controls the proportion of coniferous pulp at 15-25%, and adds appropriate amounts of cationic starch (10-15kg / ton pulp) and sizing agent (15-20kg / ton pulp). The reasonable combination of raw materials lays the foundation for subsequent processes and product performance, ensuring that the paper has good physical properties and processing adaptability.

[0168] The present invention adopts a constant-pressure beating device, and uses a circulating beating feeding to make part of the fibers secondary-fiberized. This beating method can effectively optimize the fiber structure, enhance the bonding strength of the finished paper, and provide strong support for improving the overall quality of the paper.

[0169] The primer of the present invention uses barrier material, and the top coating uses water-based high-gloss material, and the glue amount and drying temperature are precisely controlled. 2, initial baking 60-80℃) and top coating (glue amount 1.5-2.5g / m 2 , drying at 90-110℃) significantly improves the gloss, smoothness and barrier properties of paper, meeting the special needs of cigarette tipping paper.

[0170] After drying, the present invention strictly controls the dryness of the paper to 94-97%, and then performs calendering treatment to effectively improve the smoothness and tightness of the paper; the back treatment uses water to balance the difference between the two sides of the paper to prevent the paper from deforming; and clarifies various performance indicators of the product, such as the basis weight of 40±1g / m 2 , tensile strength (longitudinal) ≥ 2.0KN / m, etc., to ensure the stability of product quality in all aspects.

[0171] In order to further highlight the characteristics and the process of the present invention, the present invention also discloses comparative examples 1 and 2, wherein comparative example 1 adopts the traditional PET film transfer process, and comparative example 2 adopts a single coating without an optimized formula process. Specifically:

[0172] Comparative Example 1

[0173] Process steps

[0174] Step 1: Surface treatment of PET film: Select a suitable PET film and apply a layer of special coating on its surface. The coating formula contains 20% film-forming resin, 10% filler, 5% additive, and the rest is solvent (mixed with deionized water and ethanol in a ratio of 4:1). Place the coated PET film in an oven and dry it at 80°C for 15 minutes to solidify the coating to form a uniform bottom layer.

[0175] Step 2: Vacuum aluminum plating: Place the surface treated PET film into a vacuum aluminum plating machine. In a high vacuum environment (vacuum degree reaches 10-3Pa level), heat the aluminum wire to evaporate and deposit on the surface of the PET film to form an aluminum plating layer with a thickness of about 30-50nm. During the aluminum plating process, the aluminum plating rate is controlled to 0.5-1nm per second to ensure the uniformity of the aluminum plating layer.

[0176] Step 3: Gluing and compounding: Apply a layer of adhesive on the surface of the aluminum layer. The adhesive is a hot-melt polyurethane adhesive with a coating amount of 3-5g / m 2 Then the cigarette tipping paper and the glue-coated PET film are compounded under a certain pressure (about 0.5-1MPa), the compounding temperature is controlled at 50-60°C, and the compounding time is 5-10 minutes.

[0177] Step 4: Peeling off the PET film: After the lamination is completed, after a period of aging (24 hours at room temperature), the PET film is peeled off from the composite paper to obtain a cigarette tipping paper with an aluminum-plated glossy layer.

[0178] The basis weight of the cigarette tipping paper produced based on this comparative example is about 42g / m 2 Due to the use of PET film and the composite process, the paper weight is relatively high; the tensile strength (longitudinal) is 1.8KN / m. Due to the influence of the aluminizing process and the PET film, the longitudinal tensile strength of the paper is lower than that of Example 1 of the present application; the tear strength (transverse) is 130mN, and the transverse tear strength is also reduced due to process problems; the smoothness (glossy surface) is 1500s. The surface of the aluminizing layer is rough and porous. Even after the composite treatment, the smoothness is still not as good as that of Example 1 of the present application; 75°; the glossiness (glossy surface) is 25%. Although the glossiness is improved, it is still lower than that of Example 1 of the present application.

[0179] Comparative Example 2

[0180] Step 1, pulping and papermaking: Select a single hardwood pulp for pulping, and control the beating degree at 60-65°SR. Then make paper, and do not add cationic starch and sizing agent during the papermaking process. After papermaking, simply press dehydration and dry to make the paper dryness reach 90-92%.

[0181] Step 2: Coating: Prepare a simple coating liquid containing only 30% common starch as an adhesive and the rest water. Apply the coating liquid evenly on the paper surface, and control the amount of glue to 1-1.5g / m 2 .

[0182] Step 3: Drying: After coating, dry the paper in an oven at 80-90°C for 10-15 minutes to remove moisture and complete the production.

[0183] The basis weight of the cigarette tipping paper produced based on this comparative example is 38 g / m 2 , since not too many additives are added, the quantitative value is relatively low; tensile strength (longitudinal) 1.5KN / m, without adding cationic starch and sizing agent, the paper tensile strength is low; tear strength (transverse): 100mN, the tear strength is significantly lower than that of Example 1 of the present application; smoothness (glossy): 1000s, single coating and no optimized formula, the paper smoothness is poor; 75° gloss (glossy): 15%, the glossiness is far lower than that of Example 1 of the present application, and cannot meet the requirements of high-gloss cigarette tipping paper.

[0184] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "include," "comprises," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article, or device.

[0185] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing high-gloss cigarette tipping paper, characterized in that: The following steps are involved: Step 1: Pulping: Select appropriate coniferous and broadleaf wood pulp varieties, mix coniferous pulp and broadleaf pulp, and the proportion of coniferous pulp is 15-25%; Step 2: slurry preparation: add cationic starch to the beaten slurry and gelatinize it at 95°C. The amount of cationic starch added is 10-15kg / ton slurry. Step 3: Sizing in pulp: Add sizing agent in the pulp to adjust and control the water absorption of paper. The amount of sizing agent added is 15-20kg / ton pulp. Step 4: Papermaking: dilute the sizing slurry to a concentration of 0.45-0.6%, then form the paper sheets, dehydrate and dry them, and then calender them; Step 5: Primer: Prime the produced cigarette tipping paper. The primer is a barrier material with a glue amount of 2-3g / m². After primer, it is pre-baked at a temperature of 60-80℃ to quickly remove moisture. Step 6: Top coating: Top coating is performed on the surface of the paper after primer coating and initial drying. The latex for top coating is a water-based high-gloss material with a glue amount of 1.5-2.5g / m² and a drying temperature of 90-110℃ to adapt to a vehicle speed of 90m / min. Step 7, back coating, conditioning and calendering: The paper after surface coating is treated with back coating, then conditioned, and then calendered by a calender to obtain high-gloss cigarette tipping base paper.

2. The method for producing a high-gloss cigarette tipping paper according to claim 1, characterized in that: The primer coating formula in step 5 includes, by weight percentage: Filler: 20-25%; Water-based adhesive: 15-20%; Solvent system: 50-55%, of which deionized water accounts for 45-50% and ethanol accounts for 5-10%; Drying agent: 1-2%; Surfactant: 0.5-1%.

3. The method for producing a high-gloss cigarette tipping paper according to claim 1, characterized in that: The coating formulation of step six comprises, by weight percentage: Brightener: 5-10%; Water-based polymer: 25-30%; Solvent system: 50-60%, of which deionized water accounts for 50-55% and ethanol accounts for 10-15%; Drying agent: 1-2%; Tackifier: 3-5%.

4. The method for producing a high-gloss cigarette tipping paper according to claim 1, characterized in that: In the step 1, a constant pressure beating device is used, and through a circulating beating and feeding method, part of the pulp in the conveying pipeline after the beating of the disc mill is returned to the disc mill inlet through a reflux device, so that part of the fibers are re-fiberized.

5. The method for producing a high-gloss cigarette tipping paper according to claim 4, characterized in that: The paper dryness after drying in step 4 is controlled between 94-97%, and then calendering is performed to improve the smoothness and compactness of the paper.

6. The method for producing a high-gloss cigarette tipping paper according to claim 1, characterized in that: In the step 7, the back coating treatment uses water as the back coating material to balance the difference between the two sides of the paper due to the increase in the single-sided coating amount.

7. The method for producing high-gloss cigarette tipping paper according to claim 1, characterized in that: In the step seven, the calendering treatment uses a calender to calender the paper to improve the surface smoothness and glossiness of the paper.