CN107964825B - Raw paper of carton paper with low gram weight and production method and application thereof - Google Patents
Raw paper of carton paper with low gram weight and production method and application thereof Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
Abstract
The invention relates to a raw paper of low-gram-weight carton paper and a production method and application thereof, wherein a bleached broadleaf wood chemi-mechanical pulp board and a bleached sulfate softwood pulp board are mixed and then are disintegrated to obtain a pulp A; dehydrating and grinding the slurry A to obtain slurry B; adjusting the concentration of the slurry B to be 0.5-1.0% to obtain slurry C; adding an auxiliary agent with the mass fraction of 2.25-6.15% of the slurry C, and uniformly mixing to obtain a slurry D; and sequentially carrying out net surfing forming, dewatering, squeezing and drying on the pulp D to obtain the raw paper of the low-gram-weight carton paper. The method comprises the steps of mixing and disintegrating raw materials of bleached broad-leaved wood chemi-mechanical pulp board and bleached sulfate softwood pulp board, grinding, adjusting the concentration of ground pulp, adding an auxiliary agent, uniformly mixing, and making paper on a paper machine to obtain low-basis weight carton paper.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to raw paper of low-gram-weight carton paper as well as a production method and application thereof.
Background
The package is used as a component of a commodity, has the effect of promoting consumption in intense market competition, and simultaneously causes resource waste, so that the cost of the product is increased, and the competitiveness is reduced.In the aspect of packaging design, the concept of 'light, thin and small' is implemented, so that not only can a consumer easily open a simple package, but also the pollution of waste can be reduced. The low-basis weight white cardboard is an important outer packaging material for small-sized high-grade commodities and high-added-value products, and the annual demand of the white cardboard in the packaging of cigarettes, cosmetics, medicines, high-grade gifts and the like reaches millions of tons. At present, the basis weight of white cardboard (carton paper) used for cigarette packets is mostly 220-230 g/m2The single-side coated white cardboard of (2). According to the domestic current white cardboard production process, the quality requirement of high stiffness of carton paper cannot be met by reducing the quantitative amount of the white cardboard.
The invention of the patent application No. 201210584457.2 provides a low-quantitative ivory board and a production process thereof, and the ivory board comprises base paper and a coating layer, wherein the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially stacked, the core layer is made of BCTMP pulp, bleached chemical pulp and broke, and fiber modified enzyme is added into the BCTMP pulp. The method can obtain good fiber strength and enhance the bonding strength among finished paper, but needs three layers of composition of a surface layer, a core layer and a bottom layer, needs more slurry, is relatively complex to manufacture and has relatively high cost.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, and provides the raw paper for the carton paper with low gram weight, the production method and the application thereof, so that the raw paper for the carton paper with high stiffness and low basis weight can be produced, and the raw paper can be used for preparing low basis weight white cardboard.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method comprises the following steps:
(1) mixing and crushing a bleached broad-leaved wood chemi-mechanical pulp board and a bleached sulfate softwood pulp board to obtain a pulp A;
(2) dehydrating and grinding the slurry A to obtain slurry B;
(3) adjusting the concentration of the slurry B to be 0.5-1.0% to obtain slurry C; adding an auxiliary agent with the mass fraction of 2.25-6.15% of the slurry C, and uniformly mixing to obtain a slurry D;
(4) and sequentially carrying out net surfing forming, dewatering, squeezing and drying on the pulp D to obtain the raw paper of the low-gram-weight carton paper.
Further, the bleached broad-leaved wood chemi-mechanical pulp board and the bleached sulfate softwood pulp board in the step (1) are mixed according to the mass ratio of 5: 5-8: 2.
Further, in the step (2), the slurry is dehydrated to the concentration of 6-15 percent, and the concentration of the ground pulp is 6-15 percent.
Further, the beating degree of the slurry B in the step (2) is 40-45 DEG SR.
Further, the auxiliary agent in the step (3) comprises a humidifying agent, a cationic starch, a stiffening agent and a sizing agent, wherein the humidifying agent, the cationic starch, the stiffening agent and the sizing agent are added in amounts of 0.6-2.0% of the total oven dry mass of the bleached broad-leaved wood chemi-mechanical pulp board and the bleached sulfate softwood pulp board respectively, 1.0-3.0% of the cationic starch, 0.5-0.9% of the stiffening agent and 0.15-0.25% of the sizing agent.
Further, the wet strength agent is PAE and the sizing agent is AKD.
Further, the upper net in the step (4) is formed by single-layer papermaking.
Further, in the step (4), the dryness of the raw paper of the carton paper with the low gram weight is 92-94%.
The raw paper of the low gram weight carton paper obtained by the production method is adopted.
The application of the low gram weight carton base paper in the preparation of the low-basis weight white cardboard is described above.
Compared with the prior art, the invention has the following beneficial technical effects:
the method comprises the steps of mixing and disintegrating raw materials of bleached broad-leaved wood chemi-mechanical pulp board and bleached sulfate softwood pulp board, grinding, adjusting the concentration of ground pulp, adding an auxiliary agent, uniformly mixing, and making paper on a paper machine to obtain low-basis weight carton paper.
Furthermore, the invention adopts single-layer papermaking forming, does not need layered papermaking, has simple papermaking process and greatly reduces time and cost.
The raw paper of carton paper manufactured by the method has low basis weight, high stiffness and better qualityGood mechanical strength and the like, and the base paper ration is 150.8-152.8 g/m2The stiffness can be more than 2.9 mN.m, the tensile strength is more than 3.83KN/m, and the burst index is more than 3.80 kPa.m2/g。
The base paper of the invention can obtain the basis weight of 191.5g/m by the front coating process of primary prime coating and secondary surface coating2The low-basis weight white cardboard has the tensile strength of more than 4.69KN/m, the stiffness of more than 6.05 mN.m and the interlayer bonding strength of more than 138J/m2The folding endurance is more than 100 times, and the Cobb value is 26.4-28.0 g/square meter.
Detailed Description
The preparation method comprises the following steps:
1) firstly, adding a raw material bleached hardwood chemi-mechanical pulp board and a bleached sulfate softwood pulp board into a hydrapulper according to a certain proportion, and fully disintegrating the bleached hardwood chemi-mechanical pulp board and the bleached sulfate softwood pulp board under the condition that the total mass concentration of the bleached hardwood chemi-mechanical pulp board and the bleached sulfate softwood pulp board is 3-5% until fibers are uniformly dispersed; the proportion of the raw material bleached hardwood chemi-mechanical pulp board and the bleached sulfate softwood pulp board is the key of the process, and the bleached hardwood chemi-mechanical pulp board accounts for 50-80% of the total mass of the bleached hardwood chemi-mechanical pulp board and the bleached sulfate softwood pulp board;
2) secondly, the disintegrated pulp is dehydrated to the pulp concentration of 6-15% through screw extrusion and is conveyed to a high-concentration pulp storage tower for standby, and the high-concentration pulp storage tower is used for ensuring the production continuity and the product stability;
3) then, the pulp of the high-concentration pulp storage tower is conveyed to a medium-concentration pulp grinder by a screw to be mixed and ground, the grinding concentration is adjusted to be 6-15 percent (mass fraction), the beating degree after grinding is 40-45 degrees SR, and the ground pulp is sent to a ground pulp storage tank; wherein, the refining concentration is preferably 10% (mass fraction).
4) Adjusting the concentration of the slurry to 0.5-1.0%, adding 0.6-2.0% of a humidifying agent PAE, 1.0-3.0% of cationic starch, 0.5-0.9% of a stiffening agent and 0.15-0.25% of a sizing agent AKD, and uniformly mixing; wherein, the adding amount of each chemical is relative to the mass fraction of the initial oven-dried fiber pulp, wherein the initial oven-dried fiber pulp refers to the oven-dried total mass of the bleached hardwood chemi-mechanical pulp board and the bleached sulfate softwood pulp board; the stiffening agent is from Qingzhou Jinhao chemical Co., Ltd, and the solid content is 40%.
5) And finally, forming on a paper machine in a net mode, dewatering, squeezing and drying to obtain the raw paper of the carton paper with low gram weight. The paper sheet forming is single-layer papermaking forming, layered papermaking is not needed, and the papermaking process is simple.
The present invention will be described in further detail with reference to specific examples.
Example 1:
1) firstly, adding a bleached hardwood chemi-mechanical pulp board and a bleached sulfate softwood pulp board into a hydrapulper according to the proportion of 7:3 for fully pulping;
2) secondly, the disintegrated slurry is dewatered by screw extrusion and is conveyed to a high-concentration slurry storage tower for standby, and the high-concentration slurry storage tower is used for ensuring the production continuity and the product stability;
3) then, the pulp of the high-concentration pulp storage tower is conveyed to a medium-concentration pulp grinder by a screw to be ground into pulp, the grinding concentration is 10 percent (mass fraction), the beating degree after grinding is 40 DEG SR, and the ground pulp is conveyed to a ground pulp storage pool;
4) adjusting the concentration of the pulp to 0.8%, adding 0.8% of a wetting enhancer PAE, 1.5% of cationic starch, 0.8% of a stiffening agent and 0.25% of a sizing agent AKD relative to the mass of the initial absolutely dry fiber pulp, and uniformly mixing;
5) and finally, forming, dewatering, squeezing and drying on a paper machine, wherein the drying curve adopts 70-110-70 ℃, and the dryness of the finished paper is about 93 percent, so that the raw paper of the carton paper with low gram weight is obtained.
The paper produced by the method has higher stiffness and better mechanical strength, and the quantitative amount is 151.6g/m2The base paper has stiffness greater than 2.75 mN.m, tensile strength greater than 3.63KN/m, and burst index greater than 3.30 kPa.m2/g。
The obtained low-gram-weight carton paper is subjected to a front coating process of primary prime coating and secondary surface coating, then is dried, rolled, packed as required and finished products are put in storage, and the quantitative amount can be 193.5g/m2The tensile strength of the low-basis weight white cardboard is more than 4.15KN/m, stiffness greater than 5.43 mN.m, interlayer bonding strength greater than 112J/m2The folding endurance is more than 100 times, and the Cobb value is less than 28.0 g/square meter.
When coating:
(1) priming paint: the quantitative dispersant is added with proper amount of water → stirring → calcium carbonate (ground into powder, added after stirring) → secondary china clay (ground into powder, added after stirring) → lubricant → water repellent → latex → urea → royal blue → CMC → whitener (dissolved with hot water first) → AC-05 defoamer → pH adjustment stirring for standby.
(2) Top coating paint: adding a certain amount of dispersant into a proper amount of water → stirring → calcium carbonate (grinding into powder and stirring after adding) → first-class porcelain clay (grinding into powder and stirring after adding) → water repellent agent → latex → urea → royal blue → CMC → whitening agent (dissolving with hot water first) → AC-05 defoaming agent → adjusting pH and stirring for standby.
(3) Coating weight: the coating weight is about 40-50g/m2。
Example 2:
1) firstly, adding bleached hardwood chemi-mechanical pulp board and bleached sulfate softwood pulp board into a hydrapulper according to the proportion of 7:3 for fully pulping;
2) secondly, the disintegrated slurry is dewatered by screw extrusion and is conveyed to a high-concentration slurry storage tower for standby, and the high-concentration slurry storage tower is used for ensuring the production continuity and the product stability;
3) then, the pulp of the high-concentration pulp storage tower is conveyed to a medium-concentration pulp grinder by a screw to be ground into pulp, the grinding concentration is 6 percent (mass fraction), the beating degree after grinding is 42 DEG SR, and the ground pulp is conveyed to a ground pulp storage pool;
4) adjusting the concentration of the pulp to 0.5%, adding 0.6% of a wetting enhancer PAE, 3% of cationic starch, 0.5% of a stiffening agent and 0.15% of a sizing agent AKD relative to the mass of the initial absolutely dry fiber pulp, and uniformly mixing;
5) and finally, forming, dehydrating, squeezing and drying on a paper machine, wherein the drying curve adopts 70-110-70 ℃, the dryness of the finished paper is about 94 percent, so as to obtain the raw paper of the carton paper with low gram weight, and the raw paper is sequentially coated, dried, rolled, packed according to requirements and finished products are put in storage.
The paper produced by the method has higher stiffness and better mechanical strength, and the basis weight is 150.8g/m2The base paper has stiffness greater than 2.90 mN.m, tensile strength greater than 3.83KN/m, and burst index greater than 3.80 kPa.m2(ii) in terms of/g. Through the front coating process of primary coating and secondary surface coating, the quantitative amount of 191.5g/m can be obtained2The low-basis weight white cardboard has the tensile strength of more than 4.69KN/m, the stiffness of more than 6.05 mN.m and the interlayer bonding strength of more than 138J/m2The folding endurance is more than 100 times, and the Cobb value is less than 27.0 g/square meter.
Example 3:
1) firstly, adding bleached hardwood chemi-mechanical pulp board and bleached sulfate softwood pulp board into a hydrapulper according to the proportion of 7:3 for fully pulping;
2) secondly, the disintegrated slurry is dewatered by screw extrusion and is conveyed to a high-concentration slurry storage tower for standby, and the high-concentration slurry storage tower is used for ensuring the production continuity and the product stability;
3) then, the pulp of the high-concentration pulp storage tower is conveyed to a medium-concentration pulp grinder by a screw to be ground into pulp, the pulp grinding concentration is 15% (mass fraction), the beating degree after grinding is 45 DEG SR, and the ground pulp is conveyed to a ground pulp storage pool;
4) adjusting the concentration of the pulp to 1.0%, adding 1.5% of a wetting enhancer PAE, 2.0% of cationic starch, 0.9% of a stiffening agent and 0.2% of a sizing agent AKD relative to the mass of the initial absolutely dry fiber pulp, and uniformly mixing;
5) and finally, forming, dehydrating, squeezing and drying on a paper machine, wherein the drying curve adopts 70-110-70 ℃, the dryness of the finished paper is about 92 percent, so as to obtain the raw paper of the carton paper with low gram weight, and the raw paper is sequentially coated, dried, rolled, packed according to requirements and finished products are put in storage.
The paper produced by the method has higher stiffness and better mechanical strength, and the quantitative content is 151.0g/m2The base paper has stiffness greater than 2.79 mN.m, tensile strength greater than 3.80KN/m, and burst index greater than 3.67 kPa.m2(ii) in terms of/g. The quantitative 192.0g/m can be obtained by the front coating process of primary priming and secondary top coating2The tensile strength of the low-basis weight ivory board is more than 4.50KN/mThe stiffness is more than 5.30 mN.m, and the interlayer bonding strength is more than 145J/m2The folding endurance is more than 100 times, and the Cobb value is less than 28.0 g/square meter.
Example 4:
1) firstly, adding bleached hardwood chemi-mechanical pulp board and bleached sulfate softwood pulp board into a hydrapulper according to the proportion of 7:3 for fully pulping;
2) secondly, the disintegrated slurry is dewatered by screw extrusion and is conveyed to a high-concentration slurry storage tower for standby, and the high-concentration slurry storage tower is used for ensuring the production continuity and the product stability;
3) then, the pulp of the high-concentration pulp storage tower is conveyed to a medium-concentration pulp grinder by a screw to be ground into pulp, the grinding concentration is 8 percent (mass fraction), the beating degree after grinding is 45 DEG SR, and the ground pulp is conveyed to a ground pulp storage pool;
4) adjusting the concentration of the pulp to 0.9%, adding 2% of a wet strength agent PAE, 1% of cationic starch, 0.7% of a stiffening agent and 0.2% of a sizing agent AKD relative to the mass of the initial absolutely dry fiber pulp, and uniformly mixing;
5) and finally, forming, dehydrating, squeezing and drying on a paper machine, wherein the drying curve adopts 70-110-70 ℃, the dryness of the finished paper is about 93.5 percent, so as to obtain the raw paper of the low-gram-weight carton paper, and the raw paper is sequentially coated, dried, rolled, packed as required and warehoused as a finished product.
The paper produced by the method has higher stiffness and better mechanical strength, and the basis weight is 152.0g/m2The base paper has stiffness greater than 2.56 mN.m, tensile strength greater than 3.82KN/m, and burst index greater than 3.71 kPa.m2(ii) in terms of/g. The quantitative ratio of 193.0g/m can be obtained by the front coating process of primary priming and secondary surface coating2The low-basis weight white cardboard has the tensile strength of more than 4.52KN/m, the stiffness of more than 4.90 mN.m and the interlayer bonding strength of more than 130J/m2The folding endurance is more than 100 times, and the Cobb value is less than 26.4 g/square meter.
Example 5:
1) firstly, adding a bleached broadleaf wood chemi-mechanical pulp board and a bleached sulfate softwood pulp board into a hydrapulper according to the proportion of 5:5, 6:4, 7:3 and 8:2 respectively for fully pulping;
2) secondly, the disintegrated slurry is dewatered by screw extrusion and is conveyed to a high-concentration slurry storage tower for standby, and the high-concentration slurry storage tower is used for ensuring the production continuity and the product stability;
3) then, the pulp of the high-concentration pulp storage tower is conveyed to a medium-concentration pulp grinder by a screw to be ground into pulp, the pulp grinding concentration is 12 percent (mass fraction), the beating degree after grinding is 43 DEG SR, and the ground pulp is conveyed to a ground pulp storage pool;
4) adjusting the concentration of the pulp to 0.6%, adding 1.2% of a wetting enhancer PAE, 2.5% of cationic starch, 0.6% of a stiffening agent and 0.18% of a sizing agent AKD relative to the mass of the initial absolutely dry fiber pulp, and uniformly mixing;
5) and finally, forming, dehydrating, squeezing and drying on a paper machine, wherein the drying curve adopts 70-110-70 ℃, and the dryness of the finished paper is about 93.2 percent, so as to obtain the raw paper of the carton paper with low gram weight.
The base papers obtained were tested and the results are shown in table 1 below.
TABLE 1 blending of bleached broad-leaved wood chemi-mechanical pulp and bleached sulfate softwood pulp in different proportions
As can be seen from Table 1, the mass ratio of the bleached hardwood chemi-mechanical pulp board to the bleached sulfate softwood pulp board is 7:3, that is, when the bleached hardwood chemi-mechanical pulp board accounts for 70% of the total mass of the bleached hardwood chemi-mechanical pulp board and the bleached sulfate softwood pulp board, better paper strength and stiffness can be obtained.
The carton raw paper manufactured by the method has the characteristics of low basis weight, high stiffness, better mechanical strength and the like, and the basis weight of the raw paper is 150.8-152.8 g/m2Has a stiffness of 2.21 to 2.9 mN.m, a tensile strength of 3.63 to 3.83KN/m, and a burst index of 3.3 to 3.80 kPa.m2/g。
Claims (4)
1. A production method of raw paper of carton paper with low gram weight is characterized in that: the method comprises the following steps:
(1) mixing and disintegrating a bleached broad-leaved wood chemi-mechanical pulp board and a bleached sulfate softwood pulp board according to a mass ratio of 5: 5-8: 2 to obtain a pulp A;
(2) dehydrating and pulping the pulp A until the pulp concentration is 6-15% and the pulping concentration is 6-15% to obtain pulp B, wherein the pulping degree of the pulp B is 40-45 DEG SR;
(3) adjusting the concentration of the slurry B to be 0.5-1.0% to obtain slurry C; adding an auxiliary agent with the mass fraction of 2.25-6.15% of the slurry C, and uniformly mixing to obtain a slurry D;
the auxiliary agent comprises a humidifying agent, a cationic starch, a stiffening agent and a sizing agent, wherein the humidifying agent accounts for 0.6-2.0% of the total absolute dry mass of the bleached broad-leaved wood chemi-mechanical pulp board and the bleached sulfate softwood pulp board respectively, the cationic starch accounts for 1.0-3.0%, the stiffening agent accounts for 0.5-0.9%, and the sizing agent accounts for 0.15-0.25%, the humidifying agent is PAE, and the sizing agent is AKD;
(4) sequentially carrying out net surfing forming, dewatering, squeezing and drying on the slurry D to obtain the slurry with the quantitative ratio of 150.8-152.8 g/m2The low gram weight carton base paper;
wherein the upper wire forming adopts single-layer papermaking forming.
2. The method for producing raw paper for carton paper with low gram weight as claimed in claim 1, wherein the method comprises the following steps: and (4) the dryness of the raw paper of the carton paper with the low gram weight in the step (4) is 92-94%.
3. The raw paper for low-gram weight carton paper obtained by the production method as claimed in claim 1.
4. Use of the low grammage carton base paper of claim 3 for the preparation of low basis weight white cardboard.
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| CN110952363A (en) * | 2019-12-17 | 2020-04-03 | 华南理工大学 | Method for realizing fiber devillicating |
| CN114606799B (en) * | 2022-03-17 | 2023-07-04 | 浙江凯恩新材料有限公司 | High-performance base paper of paper-mixing adhesive tape, production method and paper-mixing adhesive tape using base paper |
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| JP3389968B2 (en) * | 1997-11-26 | 2003-03-24 | 東洋紡績株式会社 | Polyester staple fiber for wet-type nonwoven fabric having latent crimp development and method for producing the same |
| CN102002892A (en) * | 2010-09-10 | 2011-04-06 | 安徽万邦高森造纸有限公司 | Production process of low-quantitative straw wrapping paper |
| CN101985819B (en) * | 2010-09-14 | 2012-02-01 | 安徽万邦高森造纸有限公司 | Process for producing low-basis-weight waxed base paper |
| CN103790069A (en) * | 2013-01-24 | 2014-05-14 | 万国纸业太阳白卡纸有限公司 | Paperboard for anti-counterfeit cigarette |
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