CN109778594B - Food card base paper and preparation method thereof - Google Patents
Food card base paper and preparation method thereof Download PDFInfo
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- CN109778594B CN109778594B CN201910015581.9A CN201910015581A CN109778594B CN 109778594 B CN109778594 B CN 109778594B CN 201910015581 A CN201910015581 A CN 201910015581A CN 109778594 B CN109778594 B CN 109778594B
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- 235000013305 food Nutrition 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000004513 sizing Methods 0.000 claims abstract description 120
- 239000002002 slurry Substances 0.000 claims abstract description 84
- 239000010410 layer Substances 0.000 claims abstract description 75
- 239000002344 surface layer Substances 0.000 claims abstract description 61
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 55
- 239000012792 core layer Substances 0.000 claims abstract description 51
- 238000001035 drying Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 13
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 claims abstract description 6
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 239000000839 emulsion Substances 0.000 claims description 40
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 23
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 23
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 23
- 229920002472 Starch Polymers 0.000 claims description 19
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 19
- 239000008107 starch Substances 0.000 claims description 19
- 235000019698 starch Nutrition 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 10
- 239000011550 stock solution Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 6
- 230000001804 emulsifying effect Effects 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 79
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011111 cardboard Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 125000002091 cationic group Chemical group 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 239000011087 paperboard Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- YAXXOCZAXKLLCV-UHFFFAOYSA-N 3-dodecyloxolane-2,5-dione Chemical class CCCCCCCCCCCCC1CC(=O)OC1=O YAXXOCZAXKLLCV-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum ions Chemical class 0.000 description 1
- 229920006321 anionic cellulose Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 239000003381 stabilizer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The application discloses a preparation method of food base card paper, which comprises the following steps: respectively preparing surface layer slurry, bottom layer slurry and core layer slurry; performing first ASA sizing on the surface layer sizing agent, and performing second ASA sizing on the bottom layer sizing agent; performing rosin acid sizing on the core layer slurry; performing composite treatment on the surface layer slurry, the core layer slurry and the bottom layer slurry to form raw paper, wherein the surface layer formed by the surface layer slurry and the bottom layer formed by the bottom layer slurry are respectively positioned on two opposite sides of the core layer formed by the core layer slurry; and drying the base paper to form the base paper. The application also provides the food card base paper prepared by the method. Through the mode, the structural stability and the gluing efficiency of the food card base paper can be improved.
Description
Technical Field
The application relates to the technical field of papermaking, in particular to food card base paper and a preparation method thereof.
Background
The high-grade food raw cardboard is mainly used for paper cups, lunch boxes, noodle bowls and the like, has higher requirements on the appearance of the food raw cardboard, and the products of the food raw cardboard are required to be contacted with liquid under many conditions, so that the requirements on the stiffness and the water resistance of the food raw cardboard are also higher.
Disclosure of Invention
The technical problem mainly solved by the application is to provide the preparation method of the food card base paper and the food card base paper, and the problems that the existing food card base paper is difficult to dehydrate in the production process, and the prepared paper is easy to delaminate and yellow can be solved.
In order to solve the technical problem, the application provides a preparation method of food card base paper, which comprises the following steps:
respectively preparing surface layer slurry, bottom layer slurry and core layer slurry;
performing first ASA sizing on the surface layer sizing agent, and performing second ASA sizing on the bottom layer sizing agent;
performing rosin acid sizing on the core layer slurry;
performing composite treatment on the surface layer slurry, the core layer slurry and the bottom layer slurry to form raw paper, wherein the surface layer formed by the surface layer slurry and the bottom layer formed by the bottom layer slurry are respectively positioned on two opposite sides of the core layer formed by the core layer slurry;
and drying the base paper to form the base paper.
The application also provides the food raw card paper prepared by the preparation method.
Compared with the prior art, the beneficial effects of this application are: the first ASA sizing agent and the second ASA sizing agent are respectively adopted in the surface layer sizing agent and the bottom layer sizing agent, the rosin acid sizing agent is adopted in the core layer sizing agent, the problem that the system is too positive due to the acid sizing agent can be effectively avoided, the adhesive force between paper layers is effectively enhanced, paper delamination is prevented, the surface layer sizing agent and the bottom layer sizing agent are subjected to ASA sizing, the problem that the paper is difficult to dewater due to the fact that the viscosity of the rosin increases the sizing agent in the traditional acid sizing agent is effectively avoided, the processing environment of ASA sizing agent is close to neutral, and the situation that in the paper drying and dewatering process, the situation that iron parts in a drying cylinder are rusted due to high environmental acidity to cause the fact that the paper is stained and yellowed and the appearance of finished paper is affected is favorably avoided.
Drawings
FIG. 1 is a schematic representation of a food cardstock paper according to an embodiment of the present application;
FIG. 2 is a flow chart of the preparation of the food cardstock paper according to the examples of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The inventor of the application discovers through long-term research and experiments that if only internal acid sizing is adopted during the production of the paper board, namely a rosin glue and aluminum sulfate sizing system, the control requirement of the rosin glue and aluminum sulfate sizing system on a wet end system of a paper machine is higher, the PCD of the system is very easy to be over positive, and particularly under the condition that all wood pulp is adopted for a surface layer and a bottom layer, the PCD value is very small, the number of hydrogen bond combination between fibers is easily reduced, the combination strength is poor, the combination strength of paper is influenced, and the interlayer combination of the paper board is poor or the layering phenomenon is caused. And the addition of a large amount of rosin and aluminum sulfate causes the viscosity of white water and pulp to increase, and also causes difficulty in dewatering of a wire part, and causes the dryness of paper before the paper enters a drying cylinder to be reduced and drying to be difficult. In addition, rusty spots generated by the contact of the surface of the paperboard with a drying cylinder are easy to turn yellow under the condition of acidity and high humidity, and the appearance and the performance of the food card base paper are influenced. In order to solve the above problems, the present application provides the following embodiments.
As shown in fig. 1, the structure of the food raw cardboard 100 of this embodiment is shown, the food raw cardboard 100 of this embodiment includes a surface layer 110, a bottom layer 130, a core layer 120 and a surface sizing layer 140, wherein the surface layer 110 and the bottom layer 130 are respectively located on two opposite sides of the core layer 120, the outer sides of the surface layer 110 and the bottom layer 130 may further have the surface sizing layer 140, wherein the surface layer 110 and the bottom layer 130 may be respectively sized by a first ASA sizing agent and a second ASA sizing agent, for example, ASA emulsions with different concentrations or the same concentration are sized, the core layer 120 may be sized by rosin acid sizing, and the surface sizing layer 140 may be sized by starch emulsion.
Fig. 2 shows a preparation process of the food cardstock paper 100 in this embodiment, which includes the following steps:
s1: and respectively preparing surface layer slurry, core layer slurry and bottom layer slurry.
In the step, the sizing agents of all layers can be prepared by adopting the raw materials of the corresponding layers of the conventional food raw cardstock.
S2: and carrying out first ASA sizing on the surface layer sizing agent, and carrying out second ASA sizing on the bottom layer sizing agent.
In particular, ASA, known as Alkenyl Succinic Anhydrides, is a neutral sizing agent which is very reactive and can be sized in a very short time. The ASA emulsion used in the first ASA sizing is formed by emulsifying and mixing at least positive starch (namely cationic starch) and ASA stock solution in a ratio of 2: 1-4: 1. The ASA emulsion used in the second ASA sizing is formed by emulsifying and mixing at least positive starch (cationic starch) and ASA stock solution in a ratio of 2: 1-4: 1. The cationic starch can be used as a stabilizer, oil drops in the ASA stock solution are mixed with the cationic starch in the emulsifying process, positive charges are given to the oil drops, and the oil drops can be adsorbed on anionic cellulose fibers when sizing bottom layer slurry or surface layer slurry, so that the ASA emulsion is uniformly distributed on the surfaces of the fibers, and the sizing efficiency can be improved.
The ASA emulsion used for the first ASA sizing and the ASA emulsion used for the second ASA sizing can be prepared by mixing and emulsifying an ASA stock solution and a small amount of positive starch solution through a high-shear pump and then mixing the ASA stock solution and a large amount of positive starch solution.
Specifically, after preparing the surface layer slurry and the bottom layer slurry, adding corresponding and prepared ASA emulsions into the slurries at the dosing time point respectively, and uniformly mixing the ASA emulsions respectively, wherein the ASA emulsions belong to internal sizing or internal sizing. The dosage of the ASA emulsion used in the first ASA sizing is 1.2-2 Kg/T, wherein T represents the mass of the surface layer sizing agent. The dosage of the ASA emulsion used for the second ASA sizing is 1.2-2 Kg/T, wherein T represents the mass of the bottom layer sizing agent.
In this embodiment, the raw materials used in the ASA emulsion used for the first ASA sizing and the ASA emulsion used for the second ASA sizing may be all the same or partially the same, and the mixing ratio of the same raw materials may be the same or different, for example, the ratio of the positive starch in the ASA emulsion used for the first ASA sizing to the ASA stock solution may be the same or different from the ratio of the positive starch in the ASA emulsion used for the second ASA sizing to the ASA stock solution.
In this step, the sizing of the top layer slurry and the sizing of the bottom layer slurry may be separate steps.
S3: and performing rosin acid sizing on the core layer slurry.
Specifically, after core layer slurry is prepared, at least rosin and aluminum sulfate are added into the core layer slurry at corresponding dosing time points and are uniformly mixed, the dosage of the aluminum sulfate and the dosage of the rosin can be respectively 10-20 Kg/T, wherein the dosage ratio of the aluminum sulfate and the rosin is 0.5: 1-1.5: 1, wherein T represents the mass of the core layer slurry, and more preferably, the dosage ratio of the aluminum sulfate to the rosin is 0.8: 1-1.2: 1.
S4: and performing composite treatment on the surface layer sizing agent, the core layer sizing agent and the bottom layer sizing agent to form the base paper.
That is, after the surface layer slurry, the bottom layer slurry, and the core layer slurry are sized, the sized surface layer slurry, the core layer slurry, and the bottom layer slurry are subjected to a composite treatment. Specifically, the surface layer slurry is firstly compounded with the core layer slurry and then compounded with the bottom layer slurry, so that the base paper is formed. In this embodiment, the base paper has not been subjected to the drying process. In the actual compounding process, for example, the three types of pulp are respectively and sequentially conveyed to a papermaking system for forming, the formed base paper comprises a core layer 120, a surface layer 110 and a bottom layer 130, which are respectively formed by the core layer pulp, the surface layer pulp and the bottom layer pulp, and the surface layer 110 and the bottom layer 130 are respectively located on two opposite sides of the core layer 120.
In this embodiment, since the core layer 120, the surface layer 110 and the bottom layer 130 are respectively sized with different sizing emulsions, in order to avoid the influence of trivalent aluminum ions and aluminum complexes in the white water of the core layer 120 on the ASA emulsions in the surface layer 110 and the bottom layer 130, the white water of the core layer slurry is separately recovered in this embodiment, so as to recover the rest of the core layer slurry. The white water of the surface layer pulp and the white water of the bottom layer pulp can be separately recovered or recovered together. Specifically, the white water system of the paper machine is optimized, more than two white water recovery units are arranged in the papermaking system and are respectively used for separately recovering surface layer slurry, bottom layer slurry and core layer slurry, and the two sizing systems are prevented from being disordered to cause resource waste.
S5: the base paper is dried to form the base paper 100.
For example, the formed base paper sheet is sent to a drying cylinder to be dried under a certain pressure and at a proper temperature, so as to obtain the base paper 100. In the embodiment, the ASA emulsion is used for sizing the surface layer slurry and the bottom layer slurry, so that the viscosity of the slurry can be effectively reduced, and the dehydration difficulty caused by overhigh viscosity is avoided, thereby effectively shortening the drying time and improving the production efficiency.
This embodiment is through adopting first ASA sizing and second ASA sizing respectively in surface course thick liquids and bottom thick liquids, then adopts the acid sizing of rosin at sandwich layer thick liquids, can effectively avoid single acid sizing system to cause the too positive fibre that leads to of system and the hydrogen bond bonding quantity between the fibre to diminish, bonding strength variation scheduling problem to effectively strengthen the adhesive force between the paper layer, prevent that the paper from delaminating. Meanwhile, the surface layer sizing agent and the bottom layer sizing agent adopt ASA sizing types, so that the problems of difficult paper dehydration and the like caused by the fact that the viscosity of the sizing agent is increased by single acidic sizing can be effectively solved, and the processing environment of the ASA sizing agent adopted by the surface layer sizing agent and the bottom layer sizing agent is close to neutral, so that the problems that the paper is stained and yellowed due to rusting of iron parts in a drying cylinder caused by high environmental acidity and the like in the paper drying and dehydrating process are favorably solved, and the appearance and the performance of the finished paper are influenced.
Further, S6: the base paper 100 is surface-sized.
For example, the top and bottom layers of the base paper 100 are surface sized with starch emulsions, respectively. For example, the base paper 100 after drying treatment is laid flat, a certain amount of starch emulsion may be uniformly coated on the surfaces of the surface layer 110 and the bottom layer 130 of the base paper 100 by using a surface sizing rod, that is, the surface sizing is performed on the surface layer 110 and the bottom layer 130 of the base paper 100, and then the sized paper is naturally air-dried or dried on a dryer, so as to form the surface sizing layers 140 on the surfaces of the surface layer 110 and the bottom layer 130, respectively. The surface sizing can further increase the stiffness of the paper and enhance the water resistance of the paper.
Example 1
Preparing surface layer slurry and bottom layer slurry, respectively adding the prepared ASA emulsions at corresponding dosing time points, and uniformly mixing, wherein the dosage of the ASA emulsions is 1.8Kg/T respectively. Rosin and aluminum sulfate are added into the core layer slurry and mixed evenly, and the dosage of the aluminum sulfate and the rosin is respectively 18 Kg/T. And then respectively conveying the surface layer sizing agent, the core layer sizing agent and the bottom layer sizing agent after sizing to corresponding fan pumps, and entering a paper making system to form raw paper. The formed base paper comprises a surface layer 110, a core layer 120 and a bottom layer 130, then the formed paper is sent into a drying cylinder to be dried to prepare base paper 100, the base paper 100 is taken out and laid flat, a certain amount of starch emulsion is uniformly coated on the surfaces of the surface layer 110 and the bottom layer 130 of the base paper 100 by using a surface sizing rod, and then the sized paper is dried.
Comparative example 1
The surface layer slurry, the core layer slurry and the bottom layer slurry are all applied with glue by adopting rosin and aluminum sulfate. Concretely, rosin and aluminum sulfate are added into the core layer slurry and mixed evenly, the dosage of the aluminum sulfate and the rosin is respectively 18Kg/T, and 6Kg/T of rosin gum and 12KG/T of aluminum sulfate are respectively added into the surface layer slurry and the bottom layer slurry and mixed evenly. And respectively conveying the surface layer sizing agent, the core layer sizing agent and the bottom layer sizing agent after sizing to corresponding fan pumps, forming raw paper in a paper making system, then conveying the formed raw paper into a drying cylinder for drying to obtain raw paper, taking out the raw paper and spreading the raw paper, uniformly coating a certain amount of starch emulsion on the surfaces of the surface layer and the bottom layer of the raw paper by using a surface sizing rod, and then drying the raw paper after sizing.
Comparative example 2
And the surface layer slurry, the core layer slurry and the bottom layer slurry are all sized by adopting ASA emulsion. Specifically, 2.0Kg/T of ASA emulsion is added into the core layer slurry and mixed uniformly, and 1.8Kg/T of ASA emulsion is added into the surface layer slurry and the bottom layer slurry respectively and mixed uniformly. And respectively conveying the surface layer sizing agent, the core layer sizing agent and the bottom layer sizing agent after sizing to corresponding fan pumps, forming raw paper in a paper making system, then conveying the formed raw paper into a drying cylinder for drying to obtain raw paper, taking out the raw paper and spreading the raw paper, uniformly coating a certain amount of starch emulsion on the surfaces of the surface layer and the bottom layer of the raw paper by using a surface sizing rod, and then drying the raw paper after sizing.
Table 1 shows the specific experimental data of the examples and comparative examples, wherein the pH is the pH of the sized slurry and the bleed is the value of hot water at 95 ℃ for 10 min.
As shown in table 1 below, the pH values of the top layer slurry and the bottom layer slurry prepared in sample 1 and comparative example 2 using the ASA emulsion were greater than the pH values of the slurries sized using rosin and aluminum sulfate, and the food cardbase paper sized using the ASA emulsion did not show yellow spots. That is to say, the acidity of the sizing agent adopting the ASA emulsion is lower, and the paper can be effectively prevented from being stained and yellowed to generate yellow spots due to rusting of iron parts in a drying cylinder caused by high environmental acidity in the drying process. Moreover, the food card base paper prepared by applying glue on the surface layer and the bottom layer by using rosin and aluminum sulfate is not easy to dehydrate in the drying process, because the rosin increases the viscosity of the sizing agent, the food card base paper contains too much water before entering a drying cylinder for drying, so that the humidity in the drying cylinder is higher, the drying time of the paper is further prolonged, and the production efficiency of the paper is influenced.
The surface layer sizing agent and the bottom layer sizing agent of the sample 1 and the comparative example 2 are both sized by ASA emulsion, except that the core layer sizing agent of the sample 1 is sized by rosin and aluminum sulfate, while the core layer sizing agent of the comparative example 2 is still sized by ASA emulsion, and the side penetration data of the two shows that the food card base paper of the comparative example 2 which is all sized by ASA emulsion has a large side penetration value, namely, has poor water resistance, and cannot meet the water resistance requirement of the food card base paper.
TABLE 1 specific experimental data for the examples and comparative examples
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (9)
1. The preparation method of the raw paper for the food card is characterized by comprising the following steps:
respectively preparing surface layer slurry, bottom layer slurry and core layer slurry;
performing first ASA sizing on the surface layer sizing agent, and performing second ASA sizing on the bottom layer sizing agent;
performing rosin acid sizing on the core layer slurry;
performing composite treatment on the surface layer slurry, the core layer slurry and the bottom layer slurry to form raw paper, wherein the surface layer formed by the surface layer slurry and the bottom layer formed by the bottom layer slurry are respectively positioned on two opposite sides of the core layer formed by the core layer slurry;
and drying the base paper to form the base paper.
2. The method of claim 1, wherein: drying the base paper, wherein the base paper forming step comprises the following steps:
and (3) surface sizing the base paper.
3. The method of claim 2, wherein: the step of surface sizing the base paper comprises:
and respectively carrying out surface sizing on the surface layer and the bottom layer of the base paper by adopting starch emulsion.
4. The method of claim 1, wherein: performing composite treatment on the surface layer sizing agent, the core layer sizing agent and the bottom layer sizing agent to form base paper, wherein the step of forming the base paper comprises the following steps:
separately recovering the white water of the core layer slurry to recover a remaining portion of the core layer slurry.
5. The method of claim 1, wherein: the ASA emulsion used for the first ASA sizing is formed by emulsifying and mixing positive starch and ASA stock solution in a ratio of 2: 1-4: 1, wherein the dosage of the ASA emulsion used for the first ASA sizing is 1.2-2 Kg/T, and T represents the mass of the surface layer sizing agent.
6. The method of claim 1, wherein: the ASA emulsion used for the second ASA sizing is formed by emulsifying and mixing positive starch and ASA stock solution in a ratio of 2: 1-4: 1, wherein the dosage of the ASA emulsion used for the second ASA sizing is 1.2-2 Kg/T, and T represents the mass of the bottom layer slurry.
7. The method of claim 1, wherein: the sizing agent for the acid sizing of the rosin is formed by mixing rosin and aluminum sulfate, and the mass ratio of the aluminum sulfate to the rosin is 0.5: 1-1.5: 1.
8. The method of claim 7, wherein: the using amount of the aluminum sulfate is 10-20 Kg/T, and the using amount of the rosin is 10-20 Kg/T, wherein T represents the mass of the core layer slurry.
9. A food card base paper is characterized in that: the base paper is prepared by the preparation method according to any one of claims 1 to 8.
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| CN111188225A (en) * | 2020-01-06 | 2020-05-22 | 宁波亚洲浆纸业有限公司 | Core layer pulp for paper cup base paper, paper cup base paper and preparation method thereof |
| CN111235940A (en) * | 2020-01-14 | 2020-06-05 | 宁波亚洲浆纸业有限公司 | Preparation method of core layer slurry, base paper, paperboard and paper machine |
| CN113152147A (en) * | 2021-04-22 | 2021-07-23 | 叶子包装(美国)有限公司 | Environment-friendly straw paper, preparation method thereof and paper straw processing technology |
| CN114606790A (en) * | 2022-01-27 | 2022-06-10 | 广西金桂浆纸业有限公司 | Preparation process of uncoated food paperboard |
| CN115369675B (en) * | 2022-10-24 | 2023-01-20 | 山东博汇纸业股份有限公司 | Method for controlling yellow spots of paper cup base paper |
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