Application of white cardboard for cigarette in preparation of dyed cigarette card and preparation method of white cardboard for cigarette

Abstract

The invention provides application of a white cardboard for cigarettes in preparation of a dyed cigarette card. The white cardboard for the cigarette comprises a surface layer, a core layer and a bottom layer which are sequentially compounded, as well as a sizing layer compounded on the surface layer and a coating layer compounded on the sizing layer, the surface layer, the core layer and the bottom layer which are sequentially compounded are obtained by compounding three layers of paper pulp including surface layer paper pulp, core layer paper pulp and bottom layer paper pulp; the surface layer paper pulp comprises the following components in parts by weight: 1000 parts of paper pulp, 2-4 parts of an internal sizing agent, 2-8 parts of internal aluminum sulfate, 6-11 parts of cationic starch and 0.3-1 part of a retention aid in terms of absolute dry pulp. The produced white cardboard can be dyed outside a machine in the later period, cleanliness and stable quality of a cardboard production system are kept, production change loss is greatly reduced, and the produced dyed cardboard can be used for cigarette packet production, is low in cost, environmentally friendly, safe and environmentally friendly, can be dyed into dyed cigarette cardboards with different colors such as black, blue and yellow according to needs, and is flexible and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of dyed white card paper for cigarettes, and relates to application of the white card paper for cigarettes in preparation of dyed cigarette cards and a preparation method of the white card paper for cigarettes. Background Art

[0002] At present, some white cardboards for cigarettes use black cardboards in the market. Because of its production process, black dye is added to the pulp, causing the entire pulp system to be affected by the dye. When changing to other products, the entire flow system needs to be replaced and cleaned, resulting in large losses during the changeover. At the same time, the product is used in small quantities, resulting in high production costs and high prices. In addition, during the production of black cardboard, black dye is added to the pulp, and the flow system needs to be emptied and cleaned when changing to other products, which is not conducive to environmental protection.

[0003] However, the existing online production of dyed cardboard for cigarettes has the problem of single color and cannot produce dyed cardboard of different colors. In addition, the produced dyed cardboard needs to meet the special production processes of cigarette packaging such as printing, hot stamping, and die-cutting at the same time, which has complicated steps and high production costs.

[0004] However, conventional white cardboard for cigarettes cannot meet the requirements of off-machine dyeing processes. The dye is difficult to penetrate into the core layer, the dyeing is uneven, and the warping is severe, which cannot meet the post-processing requirements.

[0005] Therefore, how to design a more suitable dyed card paper for cigarettes and solve the above-mentioned problems existing in the existing dyed card paper has become one of the problems to be solved urgently by many front-line researchers in the industry. Summary of the invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide an application of white cigarette card paper in the preparation of dyed cigarette cards and a preparation method of white cigarette card paper. The white cigarette card paper provided by the present invention can be used for off-machine dyeing, and the production process is low in cost, flexible, safe and environmentally friendly.

[0007] The present invention provides application of white cigarette card paper in preparing dyed cigarette cards;

[0008] The white card paper for cigarettes comprises a surface layer, a core layer and a bottom layer which are compounded in sequence, a sizing layer compounded on the surface layer, and a coating layer compounded on the sizing layer;

[0009] The sequentially compounded surface layer, core layer and bottom layer are obtained by compounding three layers of pulp including surface layer pulp, core layer pulp and bottom layer pulp;

[0010] The surface layer pulp, measured by absolute dry pulp, comprises:

[0011] 1000 parts by weight of pulp;

[0012] 2-4 parts by weight of sizing agent in slurry;

[0013] 2-8 parts by weight of aluminum sulfate in the slurry;

[0014] Cationic starch 6-11 parts by weight;

[0015] Retention aid 0.3-1.0 parts by weight;

[0016] The paper pulp is obtained by pulping bleached kraft broadleaf pulp and bleached kraft coniferous pulp.

[0017] Preferably, the mass ratio of bleached kraft hardwood pulp to bleached kraft softwood pulp in the surface layer pulp is (75-85): (25-15);

[0018] The freeness of the bleached kraft hardwood pulp in the surface pulp is 360-450 mL;

[0019] The freeness of the bleached kraft softwood pulp in the surface pulp is 360-450 mL

[0020] The internal sizing agent in the surface layer pulp includes rosin size;

[0021] The retention aid in the surface pulp includes cationic polyacrylamide or anionic polyacrylamide;

[0022] The mass of the surface layer pulp accounts for 15% to 30% of the total mass of the three layers of pulp.

[0023] Preferably, the core layer pulp, measured by absolute dry pulp, comprises:

[0024] 1000 parts by weight of pulp;

[0025] 2-5 parts by weight of sizing agent in slurry;

[0026] 3-10 parts by weight of aluminum sulfate in the slurry;

[0027] Cationic starch 8-15 parts by weight;

[0028] Retention aid 0.3-1.0 parts by weight;

[0029] The paper pulp is obtained by pulping bleached chemical thermomechanical wood pulp and bleached sulphate broadleaf wood pulp.

[0030] Preferably, the mass ratio of bleached chemical thermomechanical pulp to bleached kraft hardwood pulp in the core pulp is (60-80): (40-20);

[0031] The freeness of the bleached chemical thermomechanical wood pulp in the core pulp is 400-450 mL;

[0032] The freeness of the bleached kraft hardwood pulp in the core pulp is 360-450 mL

[0033] The internal sizing agent in the core layer pulp includes rosin size;

[0034] The retention aid in the core layer pulp includes cationic polyacrylamide or anionic polyacrylamide;

[0035] The mass of the core layer pulp accounts for 55% to 75% of the total mass of the three layers of pulp.

[0036] Preferably, the bottom pulp, measured by absolute dry pulp, comprises:

[0037] 1000 parts by weight of pulp;

[0038] 4-9 parts by weight of sizing agent in slurry;

[0039] 3.5-15 parts by weight of aluminum sulfate in the slurry;

[0040] Cationic starch 5-10 parts by weight;

[0041] Retention aid 0.3-1.0 parts by weight;

[0042] The paper pulp is obtained by pulping bleached kraft broadleaf pulp and bleached kraft coniferous pulp.

[0043] Preferably, the mass ratio of bleached kraft hardwood pulp to bleached kraft softwood pulp in the bottom pulp is (75-85): (25-15);

[0044] The freeness of the bleached kraft hardwood pulp in the bottom pulp is 360-450 mL;

[0045] The freeness of the bleached kraft softwood pulp in the bottom pulp is 360 to 450 mL;

[0046] The internal sizing agent in the bottom pulp includes rosin size;

[0047] The retention aid in the bottom pulp comprises cationic polyacrylamide or anionic polyacrylamide;

[0048] The mass of the bottom layer pulp accounts for 10% to 25% of the total mass of the three layers of pulp.

[0049] Preferably, the bottom layer is not compounded with a sizing layer and a coating layer;

[0050] The basis weight of the white card paper for cigarettes is 200-300 g / m 2 ;

[0051] The density of the white cardboard for cigarettes is 0.6-0.8 g / cm3 ;

[0052] The total amount of volatile organic matter in the white cardboard for cigarettes shall not exceed 10.0 mg / m 2 ;

[0053] The dyed cigarette cards are specifically prepared by an off-machine dyeing process.

[0054] The present invention also provides a method for preparing white cigarette card paper in any one of the above technical solutions, comprising the following steps:

[0055] 1) Pulping the wood pulp raw material of the surface layer to obtain surface layer pulp, and then adding auxiliary raw materials into the pulp to prepare the pulp to obtain surface layer pulp;

[0056] The wood pulp raw material of the core layer is pulped to obtain the pulp for the core layer, and then the auxiliary raw material is added into the pulp for pulping to obtain the pulp for the core layer;

[0057] The bottom wood pulp raw material is pulped to obtain bottom paper pulp, and then auxiliary raw materials are added to the pulp for pulping to obtain bottom paper pulp;

[0058] 2) The surface layer pulp, core layer pulp and bottom layer pulp obtained in the above steps are pretreated respectively, and then laminated to obtain base paper, which is then pressed and dried, and then surface sizing and surface coating are performed to obtain white cardboard for cigarettes.

[0059] Preferably, the pretreatment comprises one or more steps of screening, deslagging and water filtering;

[0060] The sizing agent for the surface layer sizing includes modified starch;

[0061] The modified starch includes oxidized starch or enzyme-converted starch;

[0062] The amount of glue applied to the surface layer is 1.0 to 2.0 g / m 2 .

[0063] Preferably, the coating material for the surface coating includes one or more of a pigment, an adhesive, a dispersant, a water repellent, a defoamer and NaOH;

[0064] The coating amount of the surface layer is 20 to 30 g / m 2 ;

[0065] The process further comprises a calendering step after the surface layer is coated.

[0066] The present invention provides the application of white card paper for cigarettes in preparing dyed cigarette cards; the white card paper for cigarettes comprises a surface layer, a core layer and a bottom layer which are compounded in sequence, as well as a sizing layer compounded on the surface layer and a coating layer compounded on the sizing layer; the surface layer, the core layer and the bottom layer which are compounded in sequence are obtained by compounding three layers of pulp including surface layer pulp, core layer pulp and bottom layer pulp; the surface layer pulp, measured by absolute dry pulp, comprises: 1000 parts by weight of pulp, 2 to 4 parts by weight of an internal sizing agent, 2 to 8 parts by weight of internal aluminum sulfate, 6 to 11 parts by weight of cationic starch and 0.3 to 1.0 parts by weight of a retention aid; the pulp is obtained by pulping bleached kraft hardwood pulp and bleached kraft conifer pulp. Compared with the prior art, the present invention designs a white card paper for cigarettes with a specific structure and material, which is particularly used in preparing dyed cigarette cards by off-machine dyeing. The white card is composed of three layers of pulp, namely the surface layer, the core layer and the bottom layer. Only the surface layer is sizing and 2-3 coatings are applied. Different from the existing production methods of dyed cards such as black cards, the white card paper produced by this process can be dyed outside the machine in the later stage, which keeps the cleanliness and quality stability of the paperboard production system and can greatly reduce the loss of production change. The dyed card produced by it can be used for cigarette pack production, with low production cost, environmental friendliness, safety and environmental protection. At the same time, it can be dyed into different colors such as black, blue, yellow, etc. according to needs, which is flexible and convenient.

[0067] The white cigarette card paper that can be used in the dyeing process and is prepared through a special processing flow is easier to be dyed outside the machine than ordinary white cigarette card paper, has a good dyeing effect, is environmentally friendly, can be dyed into different colors as needed, is flexible and convenient, and the produced dyed card meets the post-processing requirements of conventional white cigarette card paper such as transfer, compounding, printing, hot stamping, die-cutting, and cigarette packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 This is a schematic structural diagram of the white cigarette card paper that can be used in the dyeing process provided by the present invention. DETAILED DESCRIPTION

[0069] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the invention.

[0070] All raw materials of the present invention have no particular limitation on their sources, and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0071] The raw materials used in the present invention have no particular limitation on their purity. The present invention preferably uses analytically pure materials or materials of conventional purity in the field of preparation of white cigarette cardboard.

[0072] The brands and abbreviations of all raw materials of the present invention are conventional brands and abbreviations in the art. Each brand and abbreviation is clear and definite in the field of its related use. Those skilled in the art can purchase them from the market or prepare them by conventional methods according to the brands, abbreviations and corresponding uses.

[0073] The abbreviations of all processes of the present invention are conventional abbreviations in the field, and each abbreviation is clear and unambiguous in the field of its related use. Those skilled in the art can understand its conventional process steps based on the abbreviations.

[0074] The present invention provides application of white cigarette card paper in preparing dyed cigarette cards;

[0075] The white card paper for cigarettes comprises a surface layer, a core layer and a bottom layer which are compounded in sequence, a sizing layer compounded on the surface layer, and a coating layer compounded on the sizing layer;

[0076] The sequentially compounded surface layer, core layer and bottom layer are obtained by compounding three layers of pulp including surface layer pulp, core layer pulp and bottom layer pulp;

[0077] The surface layer pulp, measured by absolute dry pulp, comprises:

[0078] 1000 parts by weight of pulp;

[0079] 2-4 parts by weight of sizing agent in slurry;

[0080] 2-8 parts by weight of aluminum sulfate in the slurry;

[0081] Cationic starch 6-11 parts by weight;

[0082] Retention aid 0.3-1.0 parts by weight;

[0083] The paper pulp is obtained by pulping bleached kraft broadleaf pulp and bleached kraft coniferous pulp.

[0084] In the present invention, the sizing layer and the coating layer compounded on the surface layer in the white cigarette card paper are specifically compounded only on the surface layer, and no sizing layer and coating layer are provided on the bottom layer.

[0085] In the present invention, the amount of the sizing agent added is 2 to 4 parts by weight, can be 2.4 to 3.6 parts by weight, or can be 2.8 to 3.2 parts by weight.

[0086] In the present invention, the amount of aluminum sulfate added to the slurry is 2 to 8 parts by weight, can be 3 to 7 parts by weight, and can be 4 to 6 parts by weight.

[0087] In the present invention, the added amount of the cationic starch is 6 to 11 parts by weight, can be 7 to 10 parts by weight, can be 8 to 9 parts by weight.

[0088] In the present invention, the addition amount of the retention agent is 0.3 to 1.0 parts by weight, can be 0.4 to 0.9 parts by weight, can be 0.5 to 0.8 parts by weight.

[0089] In the present invention, the mass ratio of bleached kraft hardwood pulp to bleached kraft coniferous pulp in the surface layer pulp is preferably (75-85):(25-15), more preferably (77-86):(23-14), and more preferably (80-87):(20-13).

[0090] In the present invention, the freeness of the bleached kraft hardwood pulp in the surface layer pulp is preferably 360 to 450 mL, more preferably 380 to 430 mL, and even more preferably 400 to 410 mL.

[0091] In the present invention, the freeness of the bleached kraft softwood pulp in the surface layer pulp is preferably 360 to 450 mL, more preferably 380 to 430 mL, and even more preferably 400 to 410 mL.

[0092] In the present invention, the internal sizing agent in the surface layer pulp preferably includes rosin size.

[0093] In the present invention, the retention aid in the surface layer pulp preferably includes cationic polyacrylamide or anionic polyacrylamide.

[0094] In the present invention, the mass of the surface layer pulp accounts for preferably 15% to 30% of the total mass of the three-layer pulp, more preferably 17% to 27%, and more preferably 19% to 23%.

[0095] In the present invention, the core layer pulp, measured by absolute dry pulp, comprises:

[0096] 1000 parts by weight of pulp;

[0097] 2-5 parts by weight of sizing agent in slurry;

[0098] 3-10 parts by weight of aluminum sulfate in the slurry;

[0099] Cationic starch 8-15 parts by weight;

[0100] Retention aid 0.3-1.0 parts by weight;

[0101] Specifically, the amount of the sizing agent added in the slurry is 2 to 5 parts by weight, can be 2.5 to 4.5 parts by weight, or can be 3 to 4 parts by weight.

[0102] Specifically, the amount of aluminum sulfate added to the slurry is 3 to 10 parts by weight, may be 3.5 to 8.5 parts by weight, or may be 5 to 7 parts by weight.

[0103] Specifically, the amount of the cationic starch added is 8 to 15 parts by weight, can be 9.5 to 13.5 parts by weight, or can be 11 to 12 parts by weight.

[0104] In the present invention, the paper pulp is preferably obtained by pulping bleached chemical thermomechanical pulp and bleached kraft hardwood pulp.

[0105] In the present invention, the mass ratio of bleached chemical thermomechanical pulp and bleached kraft hardwood pulp in the core layer pulp is preferably (60-80):(40-20), more preferably (64-76):(36-24), and more preferably (68-72):(32-28).

[0106] In the present invention, the freeness of the bleached chemical thermomechanical pulp in the core layer pulp is preferably 400-450 mL, more preferably 410-440 mL, and more preferably 420-430 mL.

[0107] In the present invention, the freeness of the bleached kraft hardwood pulp in the core layer pulp is preferably 360 to 450 mL, more preferably 380 to 430 mL, and even more preferably 400 to 410 mL.

[0108] In the present invention, the internal sizing agent in the core layer pulp preferably includes rosin size.

[0109] In the present invention, the retention aid in the core layer pulp preferably includes cationic polyacrylamide or anionic polyacrylamide.

[0110] In the present invention, the mass of the core layer pulp accounts for preferably 55% to 75% of the total mass of the three-layer pulp, more preferably 58% to 71%, and more preferably 61% to 67%.

[0111] In the present invention, the bottom pulp, measured by absolute dry pulp, preferably comprises:

[0112] 1000 parts by weight of pulp;

[0113] 4-9 parts by weight of sizing agent in slurry;

[0114] 3.5-15 parts by weight of aluminum sulfate in the slurry;

[0115] Cationic starch 5-10 parts by weight;

[0116] Retention aid 0.3-1.0 parts by weight;

[0117] Specifically, the amount of the sizing agent added in the slurry is 4 to 9 parts by weight, can be 5 to 8 parts by weight, or can be 6 to 7 parts by weight.

[0118] Specifically, the amount of aluminum sulfate added to the slurry is 3.5 to 15 parts by weight, can be 5 to 13 parts by weight, or can be 7 to 11 parts by weight.

[0119] Specifically, the amount of the cationic starch added is 5 to 10 parts by weight, can be 6 to 9 parts by weight, or can be 7 to 8 parts by weight.

[0120] Specifically, the addition amount of the retention agent is 0.3 to 1.0 parts by weight, can be 0.4 to 0.9 parts by weight, can be 0.5 to 0.8 parts by weight.

[0121] In the present invention, the paper pulp is preferably obtained by pulping bleached kraft hardwood pulp and bleached kraft softwood pulp.

[0122] In the present invention, the mass ratio of bleached kraft hardwood pulp to bleached kraft coniferous pulp in the bottom pulp is preferably (75-85):(25-15), more preferably (77-87):(23-13), and more preferably (80-89):(20-11).

[0123] In the present invention, the freeness of the bleached kraft hardwood pulp in the bottom pulp is preferably 360 to 450 mL, more preferably 380 to 430 mL, and even more preferably 400 to 410 mL.

[0124] In the present invention, the freeness of the bleached kraft softwood pulp in the bottom pulp is preferably 360 to 450 mL, more preferably 380 to 430 mL, and even more preferably 400 to 410 mL.

[0125] In the present invention, the internal sizing agent in the bottom pulp preferably includes rosin size.

[0126] In the present invention, the retention aid in the bottom pulp preferably includes cationic polyacrylamide or anionic polyacrylamide.

[0127] In the present invention, the mass of the bottom layer pulp accounts for preferably 10% to 25% of the total mass of the three layers of pulp, more preferably 13% to 22%, and more preferably 15% to 18%.

[0128] In the present invention, the white cigarette card paper preferably further comprises a sizing layer compounded on the surface layer.

[0129] In the present invention, the white cigarette card paper preferably further comprises a coating layer compounded on the sizing layer.

[0130] In the present invention, it is preferred that no sizing layer and coating layer are compounded under the base layer.

[0131] In the present invention, the basis weight of the white card paper for cigarettes is preferably 200 to 300 g / m2 , more preferably 210 to 260 g / m 2 , more preferably 215 to 240 g / m 2 .

[0132] In the present invention, the density of the white card paper for cigarettes is preferably 0.6 to 0.8 g / cm 3 , more preferably 0.65 to 0.78 g / cm 3 , more preferably 0.68 to 0.76 g / cm 3 .

[0133] In the present invention, the total amount of volatile organic matter in the white card paper for cigarettes is preferably not more than 10.0 mg / m 2 , more preferably not more than 5.0 mg / m 2 , more preferably not more than 2.0 mg / m 2 Specifically, it can be 0.1 to 2.0 mg / m 2 , or 0.2 to 1.5 mg / m 2 , or 0.3-1.2 mg / m 2 , or 0.4-1.0 mg / m 2 .

[0134] In the present invention, the white cigarette card paper is preferably a dyed cigarette card used in a dyeing process.

[0135] The present invention provides a method for preparing white card paper for cigarettes in the application as described in any one of the above technical solutions, comprising the following steps:

[0136] 1) Pulping the wood pulp raw material of the surface layer to obtain surface layer pulp, and then adding auxiliary raw materials into the pulp to prepare the pulp to obtain surface layer pulp;

[0137] The wood pulp raw material of the core layer is pulped to obtain the pulp for the core layer, and then the auxiliary raw material is added into the pulp for pulping to obtain the pulp for the core layer;

[0138] The bottom wood pulp raw material is pulped to obtain bottom paper pulp, and then auxiliary raw materials are added to the pulp for pulping to obtain bottom paper pulp;

[0139] 2) The surface layer pulp, core layer pulp and bottom layer pulp obtained in the above steps are pretreated respectively, and then laminated to obtain base paper, which is then pressed and dried, and then surface sizing and surface coating are performed to obtain white cardboard for cigarettes.

[0140] The present invention firstly pulps the wood pulp raw material of the surface layer to obtain the surface layer pulp, and then adds the auxiliary raw material into the pulp to prepare the pulp to obtain the surface layer pulp;

[0141] The wood pulp raw material of the core layer is pulped to obtain the pulp for the core layer, and then the auxiliary raw material is added into the pulp for pulping to obtain the pulp for the core layer;

[0142] The bottom layer wood pulp raw material is pulped to obtain bottom layer paper pulp, and then auxiliary raw materials are added into the pulp for pulping to obtain bottom layer paper pulp.

[0143] In the present invention, the surface layer pulp, core layer pulp and bottom layer pulp obtained in the above steps are respectively pretreated, and then laminated to obtain base paper, which is then pressed and dried, and then surface sizing and surface coating are performed to obtain white cardboard for cigarettes.

[0144] In the present invention, the pretreatment preferably includes one or more steps of screening, deslagging and water filtering, and more preferably includes multiple steps of screening, deslagging and water filtering.

[0145] In the present invention, the sizing agent for the surface layer sizing preferably includes modified starch.

[0146] In the present invention, the modified starch preferably includes oxidized starch or enzyme-converted starch.

[0147] In the present invention, the amount of glue applied to the surface layer (i.e., the amount of glue applied to the glue layer) is preferably 1.0 to 2.0 g / m 2 , more preferably 1.2 to 1.8 g / m 2 , more preferably 1.4 to 1.6 g / m 2 .

[0148] In the present invention, the coating material for the surface coating preferably includes one or more of a pigment, an adhesive, a dispersant, a water repellent, a defoamer and NaOH, and more preferably a pigment, an adhesive, a dispersant, a water repellent, a defoamer or NaOH.

[0149] In the present invention, the coating weight of the surface layer (i.e., the coating weight of the coating layer) is preferably 20 to 30 g / m 2 , more preferably 22 to 28 g / m 2 , more preferably 24 to 26 g / m 2 .

[0150] In the present invention, the coating amount of the surface coating is 20 to 30 g / m 2 ;

[0151] In the present invention, the step of calendering is preferably further included after coating the surface layer.

[0152] The present invention provides the use of the white cigarette card paper described in any one of the above technical solutions or the preparation method described in any one of the above technical solutions in dyeing cigarette cards.

[0153] The present invention is a complete and detailed overall technical solution, which ensures the composition and structure of white card paper for cigarettes and further improves the dyeing performance of white card paper for cigarettes. The above-mentioned white card paper for cigarettes that can be used in the dyeing process and its preparation method and application can specifically include the following contents:

[0154] A white card paper for cigarettes that can be used in a dyeing process. The white card paper is composited from three layers of pulp, namely, a surface layer, a core layer and a bottom layer.

[0155] Specifically, the weight of the surface layer slurry accounts for 15% to 30%, the weight of the core layer slurry accounts for 55% to 75%, and the weight of the bottom layer slurry accounts for 10% to 25%.

[0156] Specifically, the front side of the white cardboard is sizing, and the sizing amount is 1.0-2.0 g / m 2 .

[0157] Specifically, 2 to 3 coats are applied on the front side, with a total coating amount of 20 to 30 g / m 2 .

[0158] Specifically, there is no sizing and coating on the back side.

[0159] Specifically, the white cardboard has a basis weight of 200 to 300 g / m 2 .

[0160] Specifically, the density of the white cardboard is 0.6 to 0.8 g / cm 3 .

[0161] Specifically, the total amount of volatile organic matter in the white cardboard does not exceed 10.0 mg / m 2 .

[0162] Specifically, the white cigarette cardboard that can be used for dyeing process is composed of three layers of pulp: surface, core and bottom. The surface layer pulp accounts for 15% to 30% of the total weight of the three layers of pulp, the core layer pulp accounts for 55% to 75% of the total weight of the three layers of pulp, and the bottom layer pulp accounts for 10% to 25% of the total weight of the three layers of pulp.

[0163] Specifically, the surface layer pulp is made of 75% to 85% LBKP (bleached sulfate broadleaf pulp, the same below) and 15% to 25% NBKP (bleached sulfate coniferous pulp, the same below); the core layer pulp is made of BCTMP (bleached chemical thermomechanical pulp, the same below) and LBKP, and the pulp ratio is BCTMP:LBKP=(60-80):(40-20); the bottom layer pulp is made of 75% to 85% LBKP and 15% to 25% NBKP.

[0164] Specifically, the front side of the cigarette white cardboard that can be used for dyeing process is surface sizing, and the surface sizing amount is 1.0-2.0g / m 2.

[0165] Specifically, the front side of the cigarette white cardboard that can be used for dyeing process is coated with 2 to 3 layers, and the total coating amount is 20 to 30 g / m 2 .

[0166] Specifically, the back side of the white cigarette cardboard that can be used in the dyeing process has no surface sizing and coating.

[0167] Furthermore, the present invention also provides a method for preparing the above-mentioned white cigarette card paper that can be used in a dyeing process, comprising the following steps:

[0168] A) Pulping, providing a surface layer pulp, a core layer pulp and a bottom layer pulp; the components of each layer of pulp described in the present invention are the same as those known to those skilled in the art and are not particularly limited.

[0169] B) Wet-end chemistry, adding sizing agents such as rosin glue, aluminum sulfate, cationic starch and retention aids to the surface pulp, core pulp and bottom pulp respectively;

[0170] C) In the paper machine section, after the surface pulp, core pulp and bottom pulp are filtered and formed separately, the three-layer paper sheets are compounded, pressed, dried, surface sized, coated and calendered to obtain white cardboard.

[0171] In some specific embodiments of the present invention, the surface paper layer is prepared from surface paper sheet materials, and the surface paper sheet materials include, based on the amount of absolute dry pulp:

[0172] Surface pulp 1000kg

[0173] The amount of rosin glue added to the sizing agent is 2-4 kg

[0174] The amount of aluminum sulfate added to the slurry is 2-8 kg

[0175] The amount of cationic starch added is 6 to 11 kg.

[0176] Among them, the surface layer pulp ratio is: 15-20% NBKP and 80-85% LBKP; that is, the mass ratio of NBKP to LBKP in the surface layer fiber pulp is (15-25): (85-75); the surface layer NBKP freeness is 360-450mL; the surface layer LBKP freeness is 360-450mL.

[0177] The amount of the internal sizing agent rosin size in 1000 kg of the surface layer pulp is preferably 2 to 4 kg.

[0178] The amount of the cationic starch used in 1000 kg of the surface layer pulp is preferably 6 to 11 kg.

[0179] The core paper layer is prepared from core paper sheet materials, and the core paper sheet materials include, based on the amount of absolute dry pulp:

[0180] Core pulp 1000kg

[0181] The amount of rosin added to the sizing agent is 2-5 kg

[0182] The amount of aluminum sulfate added to the slurry is 3-10kg

[0183] The amount of cationic starch added is 8 to 15 kg.

[0184] Among them, the core layer pulp ratio is: 20% to 40% LBKP and 60% to 80% BCTMP, that is, the mass ratio of LBKP to BCTMP in the core layer fiber slurry is (20 to 40): (80 to 60); the freeness of the core layer LBKP is 360 to 450 mL; the freeness of the core layer BCTMP is 400 to 450 mL.

[0185] The bottom paper layer is prepared from bottom paper sheet materials, and the bottom paper sheet materials include:

[0186] Bottom pulp 1000kg

[0187] The amount of rosin glue added to the sizing agent is 4-9 kg

[0188] The amount of aluminum sulfate added to the slurry is 3.5-15 kg

[0189] The amount of cationic starch added is 5 to 10 kg.

[0190] The bottom pulp ratio is: 15% to 25% NBKP and 75% to 85% LBKP; that is, the mass ratio of NBKP to LBKP in the bottom slurry is (15 to 25): (85 to 75); the bottom NBKP freeness is 360 to 450 mL; the bottom LBKP freeness is 360 to 450 mL.

[0191] In the present invention, the sizing agent for surface sizing in step c) is preferably modified starch; the sizing method for surface sizing is preferably front sizing; the sizing amount for surface sizing is preferably 1.0 to 2.0 g / m 2 .

[0192] In the present invention, the coating in step c) is preferably front coating (surface coating); the coating is preferably 2 to 3 coating layers; the coating amount is preferably 20 to 30 g / m 2 The coating amount of the pre-coating and top-coating is preferably 8 to 13 g / m 2 According to the actual situation of the paper machine, the middle coating can be added, and the coating amount is preferably 5-8g / m 2.

[0193] In the present invention, the base paper layer is preferably free of surface sizing and coating.

[0194] After the front side is sizing and coated, the cardboard undergoes drying, soft calendering, winding, rewinding and other processes to obtain white cigarette card paper, which can be used for later processes such as off-machine dyeing to produce dyed cigarette cards.

[0195] See also Figure 1 , Figure 1 The schematic diagram of the structure of the white card paper for cigarettes that can be used in the dyeing process provided by the present invention includes a base paper layer S1, a core paper layer S2, a surface paper layer S3, a surface sizing layer S4 and a coating layer S5.

[0196] like Figure 1 As shown, the present invention specifically comprises a base paper layer S1, a core paper layer S2 and a surface paper layer S3 which are stacked in sequence, and the surface paper layer S3 has a surface sizing layer S4 and a coating layer S5.

[0197] The wood pulp components and weight percentages of the bottom paper layer S1 are: 75% to 85% LBKP, 15% to 25% NBKP.

[0198] The wood pulp components and weight percentages of the core paper layer S2 are: 60% to 80% BCTMP and 20% to 40% LBKP.

[0199] The wood pulp components and weight percentages of the surface paper layer S3 are: 75% to 85% LBKP, 15% to 25% NBKP.

[0200] The glue amount of the surface glue layer S4 is 1.0-2.0 g / m2, and the surface glue is applied using a traditional surface glue process.

[0201] The coating layer S5 has a coating weight of 20 to 30 g / m2, and the coating layer is coated 2 to 3 times using a coating in a traditional process.

[0202] The above content of the present invention provides the application of white cardboard for cigarettes in the preparation of dyed cigarette cards and the preparation method of white cardboard for cigarettes. The white cardboard for cigarettes designed by the present invention with a specific structure and material is particularly used for off-machine dyeing to prepare dyed cigarette cards. The white card is composed of three layers of pulp, namely, a surface layer, a core layer and a bottom layer. Only the surface layer is subjected to surface sizing and 2 to 3 coatings. Different from the existing production methods of dyed cards such as black cards, the white cardboard produced by this process can be dyed off-machine in the later stage, which keeps the cleanliness and quality stability of the paperboard production system, and can greatly reduce the loss of production change. The dyed cards produced by it can be used for cigarette pack production, with low production cost, environmental friendliness, safety and environmental protection. At the same time, the dyed cigarette cards can be dyed into different colors such as black, blue, yellow, etc. according to needs, which is flexible and convenient.

[0203] The white cigarette card paper that can be used in the dyeing process and is prepared through a special processing flow is easier to be dyed outside the machine than ordinary white cigarette card paper, has a good dyeing effect, is environmentally friendly, can be dyed into different colors as needed, is flexible and convenient, and the produced dyed card meets the post-processing requirements of conventional white cigarette card paper such as transfer, compounding, printing, hot stamping, die-cutting, and cigarette packaging.

[0204] In order to further illustrate the present invention, the application of the white cigarette card paper provided by the present invention in the preparation of dyed cigarette cards and the preparation method of the white cigarette card paper are described in detail below in combination with the examples. However, it should be understood that these examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation methods and specific operating processes are given only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention, and the protection scope of the present invention is not limited to the following examples.

[0205] Example 1

[0206] A method for manufacturing dyeable white cardboard for cigarettes comprises the following steps:

[0207] Slurry preparation and wet end forming:

[0208] After the pulp or fresh pulp is pulped by the hydraulic pulper, the surface, core and bottom layers are prepared separately:

[0209] ① Surface pulp: 20% NBKP (427mL) + 80% LBKP (398mL); the weight ratio of the surface pulp to the total pulp is 20.2%; the amount of rosin size added to the pulp: 3.0kg / t, the amount of aluminum sulfate added to the pulp: 4.5kg / t, the amount of cationic starch added: 8.0kg / t, the amount of retention agent added: 0.70kg / t;

[0210] ② Core pulp: 30% LBKP (392mL) + 70% BCTMP (435mL); the weight ratio of the core pulp to the total pulp is 63.4%; the amount of rosin size added to the pulp: 3.0kg / t, the amount of aluminum sulfate added to the pulp: 6.8kg / t, the amount of cationic starch added: 11.0kg / t, the amount of retention agent added: 0.8kg / t;

[0211] ③ Bottom pulp: 20% NBKP (427mL) + 80% LBKP (398mL); the weight ratio of the bottom pulp to the total pulp is 16.4%; the amount of rosin size added to the pulp: 7.0kg / t, the amount of aluminum sulfate added to the pulp: 8.0kg / t, the amount of cationic starch added: 8.0kg / t, the amount of retention agent added: 0.75kg / t;

[0212] The surface layer pulp, core layer pulp and bottom layer pulp are respectively screened and deslagging and sent to the surface layer headbox, core layer headbox and bottom layer headbox of the stacked paper machine. After three-layer stacking forming of the stacked paper machine, base paper with a surface layer, a core layer and a bottom layer is obtained.

[0213] The base paper of the outlet part is pressed, dried, and sizing on the front side (sizing amount is 1.5g / m 2 ), hard calendering, double coating on the front side (coating amount 25.0g / m 2 ), soft calendering, coiling, rewinding, wrapping and other processes to make the finished product.

[0214] The performance of the paperboard prepared in this example was tested and compared with conventional cigarette cards. The results are shown in Table 1:

[0215] Table 1 Physical property test results of dyeable white card paper and conventional cigarette card obtained in Example 1

[0216]

[0217] Example 2

[0218] A method for manufacturing dyeable white cardboard for cigarettes comprises the following steps:

[0219] Slurry preparation and wet end forming:

[0220] After the pulp or fresh pulp is pulped by the hydraulic pulper, the surface, core and bottom layers are prepared separately:

[0221] ① Surface pulp: 20% NBKP (405mL) + 80% LBKP (385mL); the weight ratio of the surface pulp to the total pulp is 21.0%; the amount of rosin size added to the pulp: 2.9kg / t, the amount of aluminum sulfate added to the pulp: 5.0kg / t, the amount of cationic starch added: 8.0kg / t, the amount of retention agent added: 0.70kg / t;

[0222] ② Core pulp: 31% LBKP (397mL) + 69% BCTMP (425mL); the weight ratio of the layer pulp to the total pulp is 63.1%; the amount of rosin size added to the pulp: 3.2kg / t, the amount of aluminum sulfate added to the pulp: 6.0kg / t, the amount of cationic starch added: 11.0kg / t, the amount of retention agent added: 0.75kg / t;

[0223] ③ Bottom pulp: 20% NBKP (405mL) + 80% LBKP (385mL); the weight ratio of the bottom pulp to the total pulp is 15.9%; the amount of rosin size added to the pulp: 6.5kg / t, the amount of aluminum sulfate added to the pulp: 8.0kg / t, the amount of cationic starch added: 7.5kg / t, the amount of retention agent added: 0.70kg / t;

[0224] The surface layer pulp, core layer pulp and bottom layer pulp are respectively screened and deslagging and sent to the surface layer headbox, core layer headbox and bottom layer headbox of the stacked paper machine. After three-layer stacking forming of the stacked paper machine, base paper with a surface layer, a core layer and a bottom layer is obtained.

[0225] The base paper of the outlet part is pressed, dried, and sizing on the front side (sizing amount is 1.6g / m 2 ), hard calendering, double coating on the front side (coating amount 24.5g / m 2 ), soft calendering, coiling, rewinding, wrapping and other processes to make the finished product.

[0226] The performance of the paperboard prepared in this example was tested and compared with conventional cigarette cards. The results are shown in Table 2:

[0227] Table 2 Physical property test results of dyeable white card paper and conventional cigarette card obtained in Example 2

[0228]

[0229] Example 3

[0230] A method for manufacturing dyeable white cardboard for cigarettes comprises the following steps:

[0231] Slurry preparation and wet end forming:

[0232] After the pulp or fresh pulp is pulped by the hydraulic pulper, the surface, core and bottom layers are prepared separately:

[0233] ① Surface pulp: 20% NBKP (411mL) + 80% LBKP (390mL); the weight ratio of the surface pulp to the total pulp is 20.3%; the amount of rosin size added to the pulp: 3.1kg / t, the amount of aluminum sulfate added to the pulp: 5.0kg / t, the amount of cationic starch added: 8.2kg / t, the amount of retention agent added: 0.70kg / t;

[0234] ② Core pulp: 32% LBKP (392mL) + 68% BCTMP (430mL); the weight ratio of the core pulp to the total pulp is 63.2%; the amount of rosin size added to the pulp: 3.0kg / t, the amount of aluminum sulfate added to the pulp: 6.8kg / t, the amount of cationic starch added: 12.0kg / t, the amount of retention agent added: 0.90kg / t;

[0235] ③ Bottom pulp: 20% NBKP (411mL) + 80% LBKP (390mL); the weight ratio of the bottom pulp to the total pulp is 16.5%; the amount of rosin size added to the pulp: 7.0kg / t; the amount of aluminum sulfate added to the pulp: 9.0kg / t; the amount of cationic starch added: 7.5kg / t; the amount of retention agent added: 0.75kg / t.

[0236] The surface layer pulp, core layer pulp and bottom layer pulp are respectively screened and deslagging and sent to the surface layer headbox, core layer headbox and bottom layer headbox of the stacked paper machine. After three-layer stacking forming of the stacked paper machine, base paper with a surface layer, a core layer and a bottom layer is obtained.

[0237] The base paper of the outlet part is pressed, dried, and sizing on the front side (sizing amount is 1.5g / m 2 ), hard calendering, double coating on the front side (coating amount 25.0g / m 2 ), soft calendering, coiling, rewinding, wrapping and other processes to make the finished product.

[0238] The performance of the paperboard prepared in this example was tested and compared with conventional cigarette cards. The results are shown in Table 3:

[0239] Table 3 Physical property test results of dyeable white card paper and conventional cigarette card obtained in Example 3

[0240]

[0241] The above is a detailed introduction to the application of the white cardboard for cigarettes provided by the present invention in the preparation of dyed cigarette cards and the preparation method of the white cardboard for cigarettes. The principle and implementation method of the present invention are described in detail using specific examples herein. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present invention, including the best mode, and also enables any technician in the field to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in the technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements that are not different from the textual expression of the claims, or if they include equivalent structural elements that are not substantially different from the textual expression of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. Application of white cigarette card paper in the preparation of dyed cigarette cards; The white card paper for cigarettes comprises a surface layer, a core layer and a bottom layer which are compounded in sequence, a sizing layer compounded on the surface layer, and a coating layer compounded on the sizing layer; The sequentially compounded surface layer, core layer and bottom layer are obtained by compounding three layers of pulp including surface layer pulp, core layer pulp and bottom layer pulp; The surface layer pulp, measured by absolute dry pulp, comprises: 1000 parts by weight of pulp; 2-4 parts by weight of sizing agent in slurry; 2-8 parts by weight of aluminum sulfate in the slurry; Cationic starch 6-11 parts by weight; Retention aid 0.3-1.0 parts by weight; The paper pulp is obtained by pulping bleached kraft broadleaf pulp and bleached kraft coniferous pulp.

2. The use according to claim 1, characterized in that: The mass ratio of bleached kraft hardwood pulp to bleached kraft softwood pulp in the surface layer pulp is (75-85): (25-15); The freeness of the bleached kraft hardwood pulp in the surface pulp is 360-450 mL; The freeness of the bleached kraft softwood pulp in the surface pulp is 360-450 mL The internal sizing agent in the surface layer pulp includes rosin size; The retention aid in the surface pulp includes cationic polyacrylamide or anionic polyacrylamide; The mass of the surface layer pulp accounts for 15% to 30% of the total mass of the three layers of pulp.

3. The use according to claim 1, characterized in that: The core layer pulp, measured by absolute dry pulp, comprises: 1000 parts by weight of pulp; 2-5 parts by weight of sizing agent in slurry; 3-10 parts by weight of aluminum sulfate in the slurry; Cationic starch 8-15 parts by weight; Retention aid 0.3-1.0 parts by weight; The paper pulp is obtained by pulping bleached chemical thermomechanical wood pulp and bleached sulphate broadleaf wood pulp.

4. The use according to claim 3, characterized in that: The mass ratio of bleached chemical thermomechanical pulp to bleached kraft hardwood pulp in the core pulp is (60-80): (40-20); The freeness of the bleached chemical thermomechanical wood pulp in the core pulp is 400-450 mL; The freeness of the bleached kraft hardwood pulp in the core pulp is 360-450 mL The internal sizing agent in the core layer pulp includes rosin size; The retention aid in the core layer pulp includes cationic polyacrylamide or anionic polyacrylamide; The mass of the core layer pulp accounts for 55% to 75% of the total mass of the three layers of pulp.

5. The use according to claim 1, characterized in that: The bottom pulp, measured by absolute dry pulp, comprises: 1000 parts by weight of pulp; 4-9 parts by weight of sizing agent in slurry; 3.5-15 parts by weight of aluminum sulfate in the slurry; Cationic starch 5-10 parts by weight; Retention aid 0.3-1.0 parts by weight; The paper pulp is obtained by pulping bleached kraft broadleaf pulp and bleached kraft coniferous pulp.

6. The use according to claim 5, characterized in that: The mass ratio of bleached kraft hardwood pulp to bleached kraft softwood pulp in the bottom pulp is (75-85): (25-15); The freeness of the bleached kraft hardwood pulp in the bottom pulp is 360-450 mL; The freeness of the bleached kraft softwood pulp in the bottom pulp is 360 to 450 mL; The internal sizing agent in the bottom pulp includes rosin size; The retention aid in the bottom pulp comprises cationic polyacrylamide or anionic polyacrylamide; The mass of the bottom layer pulp accounts for 10% to 25% of the total mass of the three layers of pulp.

7. The use according to claim 1, characterized in that: The bottom layer is not compounded with a sizing layer or a coating layer; The basis weight of the white card paper for cigarettes is 200-300 g / m 2 ; The density of the white cardboard for cigarettes is 0.6-0.8 g / cm 3 ; The total amount of volatile organic matter in the white cardboard for cigarettes shall not exceed 10.0 mg / m 2 ; The dyed cigarette cards are specifically prepared by an off-machine dyeing process.

8. A method for preparing white cigarette card paper for use as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Pulping the wood pulp raw material of the surface layer to obtain surface layer pulp, and then adding auxiliary raw materials into the pulp to prepare the pulp to obtain surface layer pulp; The wood pulp raw material of the core layer is pulped to obtain the pulp for the core layer, and then the auxiliary raw material is added into the pulp for pulping to obtain the pulp for the core layer; The bottom wood pulp raw material is pulped to obtain bottom paper pulp, and then auxiliary raw materials are added to the pulp for pulping to obtain bottom paper pulp; 2) The surface layer pulp, core layer pulp and bottom layer pulp obtained in the above steps are pretreated respectively, and then laminated to obtain base paper, which is then pressed and dried, and then surface sizing and surface coating are performed to obtain white cardboard for cigarettes.

9. The preparation method according to claim 8, characterized in that: The pretreatment comprises one or more steps of screening, deslagging and water filtering; The sizing agent for the surface layer sizing includes modified starch; The modified starch includes oxidized starch or enzyme-converted starch; The amount of glue applied to the surface layer is 1.0 to 2.0 g / m 2 .

10. The preparation method according to claim 8, characterized in that: The coating material for the surface coating includes one or more of a pigment, an adhesive, a dispersant, a water repellent, a defoamer and NaOH; The coating amount of the surface layer is 20 to 30 g / m 2 ; The process further comprises a calendering step after the surface layer is coated.

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